Patent Application
20240317721
The instant application contains a Sequence Listing which has been submitted electronically in ASCII format. Said ASCII copy, created on Jun. 3, 2022, is named PAT059119-WO-PCT SQL_ST25, is 7,086 bytes in size is filed herewith and is incorporated herein by reference.
The invention provides pyrazolyl derivative compounds, compositions including said compounds, the use thereof for inhibiting KRAS G12C, HRAS G12C or NRAS G12C, methods of treating or preventing disease, in particular, cancer, using said compounds. The invention also provides such pyrazolyl derivative compounds for use in the treatment of cancer and specific cancers as defined herein.
RAS are small GTPases acting as molecular ON/OFF switches, which adopt an active/inactive state when bound to GTP/GDP, respectively. In response to growth factors, guanine exchange factors exchange GDP for GTP, turning Ras ON. RAS bound to GTP adopts conformations that recruit effector proteins to the plasma membrane, thereby activating signaling cascades causing cell growth, proliferation and survival. These cancer promoting signals are very transient and tightly controlled. They are turned off immediately by the GTPase activity of RAS itself, mainly due to the 100000 fold acceleration by GTPase activating proteins (GAPs) (Bos J L et al., Cell, Volume 129, Issue 5, 1 Jun. 2007, pp 865-877). In contrast, RAS mutants are insensitive to these GAPs, causing the RAS mutants to reside longer in the GTP bound state and shifting the GTP/GDP cycle in accordance to their intrinsic hydrolysis rate towards the ON state.
The three RAS genes constitute the most frequently mutated gene family in cancer, with RAS mutations found in ˜25% of human tumors. Among the 3 paralogs, KRAS mutations are most frequent (85% of all RAS-driven cancers), whereas NRAS and HRAS mutations are less frequently reported (12% and 3%, respectively). The majority of KRAS mutations occurs at the hotspot residues G12, G13 and Q61. KRAS G12C mutations represent about 12% of all KRAS mutations and are prevalent in lung cancer patients (˜13% lung adenoma carcinoma (LUAC)), ˜3-5% colon adenocarcinomas, a smaller fractions of other cancer types and in about 20% of MYH polyposis colorectal adenomas (COSMIC v80 database; A. Aime' et al, Cancer genet. 2015, 208:390-5).
Patients with KRAS G12C positive solid tumors are only poorly treated with current therapies. There are currently no inhibitors of KRAS G12C, HRAS G12C or NRAS G12C approved for therapeutic use.
There thus remains a continued need to develop new options for the treatment of cancer, in particular, cancer tumors expressing G12C mutant Ras, in particular, for the treatment of KRAS, HRAS or NRAS G12C driven cancers.
Irreversible RAS G12C inhibitors have been previously described (for example WO2014152588, WO2017201161, WO2018119183).
The compounds described in this invention selectively react with, and inhibit, the G12C mutant KRAS, HRAS or NRAS proteins by forming an irreversible covalent bond with the cysteine at the position 12. This locks the RAS mutant protein in the inactive state. The irreversible binding of these compounds disrupts K-RAS downstream signaling. The compounds described in this invention maybe be used for the treatment of cancer, particularly the treatment of a cancer characterized by a KRAS, HRAS or NRAS G12C mutation.
The invention therefore provides compounds, pharmaceutically acceptable salts thereof, pharmaceutical compositions thereof and combinations thereof, and may be useful or the treatment of cancer, particularly the treatment of cancer characterized by a KRAS HRAS or NRAS G12C mutation.
According to a first aspect of the invention, there is hereby provided a compound of formula (I) or a pharmaceutically acceptable salt thereof:
According to a second aspect of the invention there is hereby provided a pharmaceutical composition comprising a compound or pharmaceutically acceptable salt thereof according to the first aspect of the invention and at least one pharmaceutically acceptable carrier.
According to a third aspect of the invention there is hereby provided a compound or pharmaceutically acceptable salt thereof according to the first aspect of the invention, or a pharmaceutical composition according to the second aspect of the invention for use as a medicament (e.g. in the treatment of cancer).
According to a fourth aspect of the invention there is hereby provided a method of treating cancer, the method comprising administering a therapeutically effective amount of a compound or pharmaceutically acceptable salt thereof according to the first aspect of the invention, or a pharmaceutical composition according to the second aspect of the invention to a patient in need thereof.
According to a fifth aspect of the invention there is hereby provided a use of a compound or pharmaceutically acceptable salt thereof according the first aspect of the invention, or a pharmaceutical composition according to the second aspect of the invention in a method of treating cancer.
According to a sixth aspect of the invention there is hereby provided a use of a compound or pharmaceutically acceptable salt according to the first aspect of the invention, or a pharmaceutical composition according to the second aspect of the invention in the manufacture of a medicament for treating cancer.
According to a seventh aspect of the invention there is hereby provided a combination comprising a compound or pharmaceutically acceptable salt thereof according to the first aspect of the invention, or a pharmaceutical composition according to the second aspect of the invention and one or more therapeutically active agents.
According to an eighth aspect of the invention there is hereby provided a method inhibiting the G12C mutant KRAS, HRAS or NRAS protein in a subject in need thereof, wherein the method comprises administering to the subject a therapeutically effective amount of a compound or pharmaceutically acceptable salt thereof according to the first aspect of the invention, or a pharmaceutical composition according to the second aspect of the invention.
The invention therefore provides the following numbered embodiments. It will be recognized that features specified in each embodiment may be combined with other specified features to provide further embodiments of the present invention.
Embodiment 1. A compound of formula (I), or a pharmaceutically acceptable salt thereof:
Embodiment 1a. A compound according to Embodiment 1 wherein the compound of formula (I) is a compound according to formula (1i)
Embodiment 2. A compound according to Embodiment 1 or Embodiment 1a wherein Ring A is a 6 to 9 membered spirocyclic-heterocyclylene comprising 1 or 2 heteroatoms independently selected from N and O, wherein said 6 to 9 membered spirocyclic-heterocyclylene is substituted with 0 or 1 R16 substituents, or a pharmaceutically acceptable salt thereof.
Embodiment 3. A compound according to Embodiment 2 wherein Ring A is a 7 to 9 (preferably 7 or 8) membered spirocyclic-heterocyclylene comprising 1 heteroatom which is N, wherein said spirocyclic-heterocyclylene is substituted with 0 to 1 C1-C3alkyl (preferably methyl) substituents, or a pharmaceutically acceptable salt thereof.
Embodiment 3a. A compound according to any one of the preceding Embodiments wherein the ring atom in Ring A which is directly attached to the C(═O)R6 group is a Nitrogen, or a pharmaceutically acceptable salt thereof.
Embodiment 4. A compound according to Embodiment 1 or Embodiment 1a wherein Ring A is selected from the group consisting of
wherein * denotes the point of attachment to the pyrazole ring and ** denotes the point of attachment to C(═O)R6, and wherein R16 is selected from the group consisting of C1-C3alkyl (for example Me), C1-C3fluoroalkyl, C1-C3hydroxyalkyl (for example CH2OH) and C1-C3cyanoalkyl (for example CH2CN), or a pharmaceutically acceptable salt thereof.
Embodiment 5. A compound according to Embodiment 4, wherein Ring A is
wherein * denotes the point of attachment to the pyrazole ring and ** denotes the point of attachment to —C(═O)R6, and wherein R16 is C1-C3alkyl, or a pharmaceutically acceptable salt thereof.
Embodiment 6. A compound according to any one of the preceding Embodiments, wherein R16 is methyl, or a pharmaceutically acceptable salt thereof.
Embodiment 7. A compound according to any one of the preceding Embodiments, wherein G is CR12, or a pharmaceutically acceptable salt thereof.
Embodiment 8. A compound according to Embodiment 7 wherein R12 is H, or a pharmaceutically acceptable salt thereof.
Embodiment 9. A compound according to any one of the preceding Embodiments wherein X is **—CR22—(CR32)n—*, Y is **—CR42—(CR52)m—*, and Z is selected from the group consisting of S(O)2, S, S(O), O, NR1N and C(R1C)2, where the * of X indicates the point of attachment to Z and the ** of X indicates the point of attachment to W, and where the * of Y indicates point of attachment to Z and the ** of Y indicates point of attachment to W, n is 0, 1 or 2 and m is 0, 1 or 2, or a pharmaceutically acceptable salt thereof.
Embodiment 10. A compound according to Embodiment 9 wherein n is 0 or 1, or a pharmaceutically acceptable salt thereof.
Embodiment 11. A compound according to Embodiment 10 wherein n is 1, or a pharmaceutically acceptable salt thereof.
Embodiment 12. A compound according to any one of the preceding Embodiments wherein m is 1, or a pharmaceutically acceptable salt thereof.
Embodiment 13. A compound according to Embodiment 10 wherein n and m are both 0 or both 1, or a pharmaceutically acceptable salt thereof.
Embodiment 14. A compound according to Embodiment 13 wherein n and m are both 1, or a pharmaceutically acceptable salt thereof.
Embodiment 15. A compound according to any one of Embodiments 8 to 14 wherein Z is NR1N or C(R1C)2, or a pharmaceutically acceptable salt thereof.
Embodiment 16. A compound according to Embodiment 15 wherein Z is NR1N or CHR1C, or a pharmaceutically acceptable salt thereof.
Embodiment 17. A compound according to any one of the preceding Embodiments wherein
is selected from the group consisting of:
or a pharmaceutically acceptable salt thereof.
Embodiment 18. A compound according to Embodiment 17, wherein
is selected from the group consisting of:
preferably wherein
or a pharmaceutically acceptable salt thereof.
Embodiment 19. A compound according to any one of the preceding Embodiments wherein R6 is CR7a═C(R7b)2, or a pharmaceutically acceptable salt thereof.
Embodiment 20. A compound according to any one of the preceding Embodiments wherein R7a is H, or a pharmaceutically acceptable salt thereof.
Embodiment 21. A compound according to Embodiment 19 or Embodiment 20 wherein each R7b is independently selected from the group consisting of H, halo (preferably chloro), or a pharmaceutically acceptable salt.
Embodiment 22. A compound according to Embodiment 21 wherein each R7b is H or wherein one R7b is H and one R7b is halo (preferably chloro) or a pharmaceutically acceptable salt thereof.
Embodiment 23. A compound according to Embodiment 22 wherein each R7b is H, or a pharmaceutically acceptable salt thereof.
Embodiment 24. A compound according to any one of the preceding Embodiments wherein R10 and R11 are joined together, in combination with the 6 membered aryl or heteroaryl to which they are mutually attached, to form a fused bicyclic aryl or heteroaryl group selected from the group consisting of:
wherein:
Embodiment 25. A compound according to Embodiment 24 wherein R10 and R11 are joined together with the 6 membered aryl or heteroaryl to which they are attached to form a fused bicyclic aryl or heteroaryl group selected from the group consisting of
or a pharmaceutically acceptable salt thereof.
Embodiment 26. A compound according to Embodiment 25 wherein R10 and R11 are joined together with the 6 membered aryl or heteroaryl to which they are attached to form the fused bicyclic heteroaryl group
or a pharmaceutically acceptable salt thereof, for example, wherein the compound is of formula (1ii),
wherein G, Ring A, Ra, RZ, R6, R8, R9, R14 and R15 are as defined in any one of the preceding Embodiments, or a pharmaceutically acceptable salt thereof.
Embodiment 27. A compound according to any one of Embodiments 24 to 26 wherein R14, where present, is H, or a pharmaceutically acceptable salt thereof.
Embodiment 28. A compound according to any one of Embodiments 24 to 27 wherein R15, where present, is H or NH2, or a pharmaceutically acceptable salt thereof.
Embodiment 29. A compound according to Embodiment 28 wherein R15, where present, is H, or a pharmaceutically acceptable salt thereof.
Embodiment 30. A compound according to any one of the preceding Embodiments wherein Ra is CN or C(R13)3, or a pharmaceutically acceptable salt thereof.
Embodiment 31. A compound according to Embodiment 30 wherein:
Embodiment 32. A compound according to Embodiment 31 wherein i) each R13 is H, or ii) each R13 is deuterium, or a pharmaceutically acceptable salt thereof.
Embodiment 33. A compound according to Embodiment 32 wherein each R13 is H, or a pharmaceutically acceptable salt thereof.
Embodiment 34. A compound according to any one of the preceding Embodiments wherein R8 is halo (e.g. chloro), methyl, H or OMe, or a pharmaceutically acceptable salt thereof.
Embodiment 35. A compound according to Embodiment 34 wherein R8 is chloro or methyl, or a pharmaceutically acceptable salt thereof.
Embodiment 36. A compound according to any one of the preceding Embodiments wherein R9 is H, methyl or halo (e.g. chloro or fluoro), or a pharmaceutically acceptable salt thereof.
Embodiment 37. A compound according to Embodiment 36 wherein R9 is methyl or chloro, or a pharmaceutically acceptable salt thereof.
Embodiment 38. A compound according to any one of the preceding Embodiments wherein each R2 is independently selected from the group consisting of H, C1-C3alkyl, C3-C4cycloalkyl, C1-C3alkylene-O—C1-C3alkyl, C1-C3haloalkyl and cyano, or
Embodiment 39. A compound according to Embodiment 38 wherein each R2 is independently selected from the group consisting of H, C1-C3 alkyl, C1-C3haloalkyl and C1-C3alkylene-O—C1-C3alkyl, or
Embodiment 40. A compound according to Embodiment 39 wherein each R2 is independently selected from the group consisting of H, C1-C3 alkyl, C1-C3fluoroalkyl and C1-C3alkylene-O—C1-C3alkyl or wherein, where present, two R2 groups in combination with the carbon atom to which they are mutually attached form a C4-C5cycloalkyl or 4 to 6 membered heterocyclyl comprising 1 heteroatom which is N or O, wherein the 4 to 6 membered heterocyclyl is unsubstituted or substituted with C(═O)—CH3,
Embodiment 41. A compound according to any one of the preceding Embodiments wherein each R4 is independently selected from H and C1-C3alkyl (for example, Me), or a pharmaceutically acceptable salt thereof.
Embodiment 42. A compound according to Embodiment 41 wherein each R4 is H, or a pharmaceutically acceptable salt thereof.
Embodiment 43. A compound according to any one of the preceding Embodiments wherein each R3 is independently H, halo (e.g. fluoro) or C1-C3alkyl, or a pharmaceutically acceptable salt thereof.
Embodiment 44. A compound according to Embodiment 43 wherein each R3 is H, or a pharmaceutically acceptable salt thereof.
Embodiment 45. A compound according to any one of the preceding Embodiments wherein each R5 is independently selected from H and Me (preferably wherein each R5 is H), or a pharmaceutically acceptable salt thereof.
Embodiment 46. A compound according to any one of the preceding Embodiments wherein R1A and R1B, where present, are independently selected from the group consisting of: i) C1-C6alkyl,
Embodiment 47. A compound according to any one of the preceding Embodiments wherein each Rx is independently selected from the group consisting of C1-C3alkylene-O—C1-C3alkyl, C1-C3alkyl (e.g., Me, Et, iPr), halo (preferably fluoro), oxo, hydroxyl, O—C1-C3alkyl and 3 to 6 membered heterocyclyl comprising 1 to 3 heteroatoms (preferably 1 or 2 heteroatoms) independently selected from the group consisting of N, O and S and C1-C3hydroxyalkyl,
Embodiment 48. A compound according to any one of the preceding Embodiments wherein the compound is a compound of formula (II) or (IIa)
(The skilled person would naturally understand that oxo (═O) can only be attached to an sp3 ring carbon, and not an sp2 ring carbon, given that sp2 ring carbons lack the necessary valency.)
Purely by way of an example, when RZ is
substituted with 0 substituents, formula (II) is
Embodiment 49. A compound according to any one of the preceding Embodiments wherein the compound according to formula (I) is a compound according to formula (III) or (IIIa)
Embodiment 50. A compound according to any one of the preceding Embodiments wherein Z is NR1N, and wherein R1N is selected from the group consisting of:
Embodiment 51. A compound according to any one of Embodiments 1, 1a and 50 wherein R1N is selected from the group consisting of
Embodiment 52. A compound according to any one of Embodiments 1, 1a, 50 and 51, wherein R1N is selected from the group consisting of C(═O)—CH3,
wherein * indicates the point of attachment to the remainder of the molecule, or a pharmaceutically acceptable salt thereof.
By way of example, where R1N is
the compound can be expressed by the following formula:
By way of a further example, where R1N is
the compound can be expressed by the following formula
Embodiment 53. A compound according to any one of Embodiments 1 to 49 wherein Z is CHR1C, and wherein R1C is selected from the group consisting of
Embodiment 54. A compound according to any one of Embodiments 1, 1a and Embodiment 53 wherein Z is CHR1C, and wherein R1C is selected from the group consisting of
Embodiment 55. A compound according to any one of Embodiments 1, 1a 53 and 54 or wherein Z is CHR1C and R1C is selected from the group consisting of H, N(C1alkyl)-C(═O)—C1alkyl, N(C1alkyl)-C(═O)—C1alkylene-O—C1alkyl,
Embodiment 56. A compound selected from any of Examples 1-320, or a pharmaceutically acceptable salt thereof.
(It should be understood that Embodiment 56 includes all of “a”, “b”, “c” and “d” exemplary compounds)
Embodiment 56a. A compound of formula (I) according to Embodiment 1, or a pharmaceutically acceptable salt thereof, wherein:
Embodiment 57. A compound selected from the group consisting of:
or a pharmaceutically acceptable salt thereof.
Embodiment 58. A pharmaceutical composition comprising a compound according to any one of the preceding Embodiments, or a pharmaceutically acceptable salt thereof and at least one pharmaceutically acceptable carrier.
Embodiment 59. A compound or a pharmaceutically acceptable salt thereof according to any one of Embodiments 1 to 57, or a pharmaceutical composition according to Embodiment 58 for use as a medicament.
Embodiment 60. A compound or a pharmaceutically acceptable salt thereof according to any one of Embodiments 1 to 57, or a pharmaceutical composition according to Embodiment 58 for use in the treatment of cancer.
Embodiment 61. A method of treating cancer, the method comprising administering a therapeutically effective amount of a compound or a pharmaceutically acceptable salt thereof according to any one of Embodiments 1 to 57, or a pharmaceutical composition according to Embodiment 58 to a patient in need thereof.
Embodiment 62. Use of a compound or pharmaceutically acceptable salt thereof according to any one of Embodiments 1 to 57, or a pharmaceutical composition according to Embodiment 58 in a method of treating cancer.
Embodiment 63. Use of a compound or pharmaceutically acceptable salt according to any one of Embodiments 1 to 57, or a pharmaceutical composition according to Embodiment 58 in the manufacture of a medicament for treating cancer.
Embodiment 64. The compound for use or composition for use according to Embodiment 60, the method according to Embodiment 61 or use according to Embodiment 62 or Embodiment 63 wherein the cancer is selected from the group consisting of lung cancer (including lung adenocarcinoma and non-small cell lung cancer), colorectal cancer (including colorectal adenocarcinoma), pancreatic cancer (including pancreatic adenocarcinoma), uterine cancer (including uterine endometrial cancer) and rectal cancer (including rectal adenocarcinoma).
Embodiment 65. The compound for use, composition for use, method or use according to Embodiment 64 wherein the cancer is mediated by a KRAS, NRAS or GRAS G12C mutation.
Embodiment 66. A combination comprising a compound or pharmaceutically acceptable salt thereof according to any one of Embodiments 1 to 57, or a pharmaceutical composition according to Embodiment 58 and one or more therapeutically active agents.
Embodiment 67. A method of inhibiting the G12C mutant KRAS, HRAS or NRAS protein in a subject in need thereof, wherein the method comprises administering to the subject a therapeutically effective amount of a compound or pharmaceutically acceptable salt thereof according to any one of Embodiments 1 to 57, or a pharmaceutical composition according to Embodiment 58.
In an embodiment of the invention, the compound of formula (I) or pharmaceutically acceptable salt thereof is a compound of formula (Ia),
or a pharmaceutically acceptable salt thereof. In this embodiment, G, Ring A, Ra, R2, R2C, R6, R8, R9, R10 and R11 are as defined in any one of numbered embodiments 1 to 49 and 53 to 55 above.
In an alternative embodiment of the invention, the compound of formula (I) or pharmaceutically acceptable salt thereof is a compound of formula (Ib),
or a pharmaceutically acceptable salt thereof. In this embodiment, G, Ring A, Ra, R2, R1N, R6, R8, R9, R10 and R11 are as defined in any one of numbered embodiments 1 to 52 above.
Unless specified otherwise, the term “compounds of the present invention” or “compound of the present invention” refers to compounds of formula (I), subformulae thereof and exemplified compounds, as well as pharmaceutically acceptable salts thereof, including all stereoisomers (including diastereoisomers, enantiomers and atropisomers thereof), tautomers and isotopically labeled compounds (including deuterium substitutions), as well as inherently formed moieties. Where one isomer (enantiomer, diastereomer, atropisomer, or geometric isomer) has higher intrinsic activity as an inhibitor of RAS G12C mutant protein than its opposite isomer, the more active isomer is typically preferred.
The presence of diastereoisomers can be identified by a person of skill in the art with tools such as NMR. Separation of diastereoisomers can be carried out by a person of skill in the art using chromatographic methods, with tools such as HPLC (High Performance Liquid Chromatography), Thin Layer Chromatography, SFC (Supercritical Fluid Chromatography), GC (Gas Chromatography), or recrystallization techniques. Separation of enantiomers can be carried out by a person of skill in the art with tools such as chiral HPLC, chiral SFC, chiral GC.
Compounds of the present invention, in particular, ortho-substituted biaryl compounds may exhibit conformational, rotational isomerism, herein referred to as atropisomerism (Eliel, E. and Wilen, S. (1994) Stereochemistry of Organic Compounds, John Wiley & Sons, Inc., pp. 1142-55). In other words, depending upon the substituents on the bi-aryl ring moiety, such biaryl compounds of the present invention exhibit atropisomerism.
Thus, the compounds of formula (I), and subformulae thereof and their isomeric mixtures (including diastereomeric mixtures, enantiomeric mixtures, atropisomeric mixtures and racemic mixtures), also form part of the invention. Likewise, “diastereomerically enriched”, “atropisomerically enriched” and/or “entantiomerically enriched” mixtures of the compounds of formula (I) [including, for example substantially pure diastereoisomers and/or atropisomers of formula (I)], and subformulae thereof also form part of the invention.
The following definitions also apply unless otherwise provided or apparent from context:
As used herein, the term “halogen” “halo”, “hal”, etc. refers to fluorine, bromine, chlorine or iodine. Halogen-substituted groups and moieties, such as alkyl substituted by halogen (haloalkyl) can be mono-, poly- or per-halogenated. Chloro and fluoro are preferred halo substituents on alkyl or cycloalkyl groups, with fluoro being most preferred, unless otherwise specified. Fluoro, chloro and bromo, are often preferred on aryl or heteroaryl groups unless otherwise specified.
The term “heteroatom” refers to an atom which is neither carbon nor hydrogen. Heteroatoms include (but are not limited to) N, O, S, F, Cl, Br, P, I, Se and Si. Most preferably, heteroatoms present in the compounds of the present invention are selected from the group consisting of N, O, S, F and Cl.
Ring heteroatoms, unless indicated otherwise are preferably selected from the group consisting of N, O, S and P. More preferably, ring heteroatoms in the present invention are selected from N, O and S. Most preferably, ring heteroatoms in the present invention are selected from N and O. Where “heteroatom” or “heteroatoms” is mentioned for a ring, this refers to ring heteroatoms. Where N is a ring heteroatom the N is typically (valency permitting) bonded to hydrogen. Said hydrogen may, however, be replaced by another group (which may be described as a substituent) if the ring is described as substituted. Alternatively, the substituent can be attached to a carbon ring atom. Where S is a ring heteroatom, the S may be in the form of S, SO, or SO2. Where P is a ring heteroatom, the P is preferably in the form of P(═O)C1-C3alkyl, most preferably P(═O)C1alkyl.
As used herein, the term “heterocyclyl”, “heterocycle”, “heterocyclic” etc. refers to a heterocyclic radical that is saturated or partially unsaturated but not aromatic, and can be a monocyclic or a polycyclic ring, including a fused or bridged bicyclic ring system (e.g.
respectively). A heterocycle or heterocyclyl contains at least one non-carbon atom as a ring member, typically N, O, S or P unless otherwise specified, more typically N, O or S, and yet more typically N or O. Unless otherwise specified, a heterocyclyl group has 3 to 10, preferably 3 to 9, e.g. 4 to 7 ring atoms; wherein one or more, preferably one to four, especially one, two or three ring atoms are heteroatoms independently selected from P, O, S and N (e.g. O, S and N), the remaining ring atoms therefore being carbon.
An unsaturated heterocyclyl can have one or two double bonds, but is not aromatic. Preferably, unless described as unsaturated, the heterocyclyl groups in the compounds of the invention are saturated single rings. Preferably, a heterocyclyl group has one or two heteroatoms as ring atoms, and preferably the heteroatoms are not directly connected to each other. Examples of heterocycles include tetrahydrofuran (THF), dihydrofuran, 1,4-dioxane, morpholine, 1,4-dithiane, piperazine, piperidine, 1,3-dioxolane, imidazolidine, imidazoline, pyrroline, pyrrolidine, tetrahydropyran, dihydropyran, oxathiolane, dithiolane, 1,3-dioxane, 1,3-dithiane, oxathiane, thiomorpholine, and the like.
The term “5-7 membered unsaturated heterocyclyl” refers to a ring radical containing 5 to 7 ring atoms comprising (unless stated otherwise) 1, 2, or 3, heteroatoms individually selected from nitrogen, oxygen and sulfur, and containing one or more C—C double bonds, preferably one C—C double bond. Where the heterocycle contains S or N as heteroatoms, the S may be present as SO or SO2 groups and the N may be present as the N-oxide, where valency allows. The term includes a 5-, 6- or 7-membered non-aromatic monocyclic ring radical containing one or more C—C double bonds, preferably one C—C double bond, and 1, 2, or 3, heteroatoms individually selected from nitrogen, oxygen and sulfur, preferably one oxygen. Examples of 5-7 membered unsaturated heterocyclyls include, but are not limited to, 6-membered non-aromatic monocyclic radicals containing one oxygen and a C—C double bond such as 3,4-dihydro-2-H-pyranyl, 5,6-dihydro-2H-pyranyl and 2H-pyranyl.
As used herein, the term “carbocyclyl”, “carbocycle”, “carbocyclic” etc. refers to a cyclic radical containing only carbon and hydrogen atoms that is saturated or partially unsaturated but not aromatic, and can be a monocyclic or a polycyclic ring, including a fused or bridged bicyclic ring system. Each ring atom is a carbon atom.
The term “carbocyclyl”, “carbocycle”, “carbocyclic” etc. therefore encompasses cycloalkyls and cycloalkenes, As used herein, the term “cycloalkyl” refers to a saturated carbocyclic ring radical. C3-C7 cycloalkyl is any such ring radical containing 3 to 7 carbon atoms such as cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl and cycloheptyl. As used herein, the term “cycloalkylene” refers to a non-aromatic carbocyclic ring radical containing one double bond. The term “monocyclic cycloalkylene” refers to a non-aromatic monocyclic carbocyclic ring radical containing one double bond. The term includes, but is not limited to “C5-C7-cycloalkylene” which is a non-aromatic carbocyclic ring radical containing 5 to 7 carbon atoms and one C—C double bond. Examples of suitable cycloalkylene groups are non-aromatic carbocyclic ring containing 5 to 7 carbon atoms and one or more C—C double bonds such as cyclopentenyl, cyclohexenyl (e.g., cyclohex-1-en-1-yl, cyclohex-2-en-1-yl, cyclohex-3-en-1-yl).
As used herein, the term “spirocyclic-heterocyclyl”, “spirocyclic-heterocyclylene” “spirocyclic-heterocycle”, “spirocyclic-heterocyclic” etc. refers to ring system comprising a first carbocylic or heterocyclic ring comprising from 3 to 8 ring atoms wherein two of the substituents on a carbon ring atom in said first carbocyclic or heterocyclic ring join together to form a second carbocyclic or heterocyclic ring comprising from 3 to 8 ring atoms, with the proviso that at least one of the first and second rings is a heterocyclic ring comprising one or more heteroatoms selected from the group consisting of N, O, S and P (e.g. one or more heteroatoms selected from the group consisting of N, O and S, e.g. one or more heteroatoms selected from N and O). The term 6 to 10 membered spirocyclic-heterocyclyl, as used herein means that the total number of ring atoms in the first carbocyclic or heterocyclic ring and the second carbocyclic or heterocyclic ring is from 6 to 10. For instance, the spirocyclic-heterocyclyl
is a 7 membered spirocyclic heterocyclylene, as there are 7 ring atoms present. As will be appreciated by the skilled person, a “spirocyclic-heterocyclyl” is a mono-radical, whereas a “spirocyclic-heterocyclylene” is a di-radical (analogous to alkyl and alkylene).
As used herein, the term “C1-C6alkyl” refers to a straight or branched hydrocarbon chain radical consisting solely of carbon and hydrogen atoms, containing no unsaturation, having from one to six carbon atoms, and which is attached to the rest of the molecule by a single bond. Examples of C1-C6-alkyl include, but are not limited to, methyl, ethyl, n-propyl, n-hexane, 1-methylethyl (iso-propyl) and n-butyl. A preferred example is methyl. Preferably each “C1-C6alkyl” is a “C1-C4alkyl”—i.e. which includes from one to four carbon atoms.
As used herein, the term “aryl” refers to an aromatic hydrocarbon group having 6-14 carbon atoms in the ring portion. Typically, aryl is monocyclic, bicyclic or tricyclic (preferably monocyclic) aryl having 6-14 carbon atoms, often 6-10 carbon atoms, e.g., phenyl or naphthyl. Furthermore, the term “aryl” as used herein, refers to an aromatic substituent which can be a single aromatic ring, or multiple aromatic rings that are fused together. Non-limiting examples include phenyl, naphthyl and 1,2,3,4-tetrahydronaphthyl, provided the tetrahydronaphthyl is connected to the formula being described through a carbon of the aromatic ring of the tetrahydronaphthyl group. Phenyl is generally preferred unless stated otherwise. The term “phenyl” refers to a radical of the formula —C6H5. In substituted phenyl, one or more or the hydrogen atoms in —C6H5 are replaced with a substituent or with substituents, especially any one described herein.
The term “heteroaryl” is a 5-14 membered, typically 5-10 membered, most typically 5-6 membered monocyclic or bicyclic (preferably monocyclic) aromatic ring radical which, unless otherwise stated, comprises 1, 2, 3 or 4 heteroatoms individually selected from nitrogen, oxygen and sulfur in the ring radical. Typically, the heteroaryl is a 5-10 membered ring system, e.g., a 5-6 membered monocyclic. Typical heteroaryl groups include 2- or 3-thienyl, 2- or 3-furyl, 2- or 3-pyrrolyl, 2-, 4-, or 5-imidazolyl, 1-, 3-, 4-, or 5-pyrazolyl, 2-, 4-, or 5-thiazolyl, 3-, 4-, or 5-isothiazolyl, 2-, 4-, or 5-oxazolyl, 3-, 4-, or 5-isoxazolyl, 3- or 5-(1,2,4-triazolyl), 4- or 5-(1,2,3-triazolyl), 1- or 2- or 3-tetrazolyl, 2-, 3-, or 4-pyridyl, 3- or 4-pyridazinyl, 2-pyrazinyl, and 2-, 4-, or 5-pyrimidinyl.
A substituted heteroaryl is a heteroaryl group having one or more substituents, typically 1, 2 or 3 substituents, on the heteroaryl ring replacing a hydrogen atom that would be on the unsubstituted heteroaryl.
The term “5-6 membered heteroaryl” is an aromatic monocyclic ring radical which, unless otherwise stated, comprises 1, 2, 3 or 4 heteroatoms individually selected from nitrogen, oxygen and sulfur. The term includes a 5- or 6-membered aromatic ring radical containing 1, 2 or 3 heteroatoms selected from N, O and S as ring members, preferably 1 or 2 heteroatoms independently selected from N and O as ring members. The term includes 6-membered rings in which an aromatic tautomer exists, as for example in the case for the 1H-pyridin-2-one system. Examples of suitable 5-6 membered heteroaryl groups include, but are not limited to, 2- or 3-thienyl, 2- or 3-furyl, 2- or 3-pyrrolyl, 2-, 4-, or 5-imidazolyl, 1-, 3-, 4-, or 5-pyrazolyl, 2-, 4-, or 5-thiazolyl, 3-, 4-, or 5-isothiazolyl, 2-, 4-, or 5-oxazolyl, 3-, 4-, or 5-isoxazolyl, 3- or 5-(1,2,4-triazolyl), 4- or 5-(1,2,3-triazolyl), 1- or 2- or 3-tetrazolyl, 2-, 3-, or 4-pyridyl, 3- or 4-pyridazinyl, 2-pyrazinyl, and 2-, 4-, or 5-pyrimidinyl.
As used herein, the term “C1-C6hydroxyalkyl” refers to a C1-C6alkyl radical as defined herein, wherein one of the hydrogen atoms of the C1-C6alkyl radical is replaced by OH. Examples of C1-C6hydroxyalkyl include, but are not limited to, hydroxy-methyl, 2-hydroxy-ethyl, 2-hydroxy-propyl, 3-hydroxy-propyl and 5-hydroxy-pentyl.
As used herein, the term “SO2—C1-C6-alkyl” refers to a C1-C6alkyl radical as defined herein, which is attached to the rest of the molecule via an S(═O)2 linker.
As used herein, the term “SO2-3-10 membered heterocyclyl” refers to a 3-10 membered heterocyclyl as defined herein, which is attached to the rest of the molecule via an S(═O)2 linker. As used herein, the term “O—C1-C6alkyl” refers to C1-C6alkyl radical as defined herein, which is attached to the rest of the molecule via an O linker.
As used herein, the term “C1-C6alkylene-O—C1-C6alkyl” refers to a C1-C6alkyl radical as defined herein, wherein one of the hydrogen atoms of said C1-C6 alkyl radical has been replaced with —O—C1-C6alkylene (attached to the C1-C6alkyl radical through the oxygen). An example of “C1-C6alkylene-O—C1-C6alkyl” is —CH2—O—CH3.
As used herein, the term “O—C1-C6alkylene-O—C1-C6alkyl” refers to a C1-C6alkyl radical as defined herein, wherein one of the hydrogen atoms of said C1-C6 alkyl radical has been replaced with 0-C1-C6alkylene-O.
As used herein the term “C1-C6haloalkyl” refers to a C1-C6alkyl radical as defined herein, wherein one or more of the hydrogen atoms of said C1-C6 alkyl has been replaced with a halogen atom. Preferably said one or more halogen atom(s) are each fluorine atom(s), in which case the “C1-C6haloalkyl” is a “C1-C6fluoroalkyl”.
As used herein, the term “O—C1-C6haloalkyl” refers to C1-C6haloalkyl radical as defined herein, which is attached to the rest of the molecule via an O linker.
As used herein the term “C1-C6hydroalkyl” refers to a C1-C6alkyl radical as defined herein, wherein one or more of the hydrogen atoms of said C1-C6 alkyl has been replaced with hydroxyl. As will be appreciated by one of normal skill in the art, only one hydrogen atom on any given carbon atom in said C1-C6 alkyl radical can be replaced by hydroxyl.
As used herein, the term “amino” refers to an —NH2 group.
As used herein, the term “C1-C6alkylamino” refers to a C1-C6alkyl radical as defined herein, wherein one or more of the hydrogen atoms of said C1-C6 alkyl radical has been replaced with an amino group. As will be appreciated by one of normal skill in the art, only one hydrogen atom on any given carbon atom in said C1-C6 alkyl radical can be replaced by an amino group.
As used herein the term “C1-C6cyanoalkyl” refers to a C1-C6alkyl radical as defined herein, wherein all three hydrogen atoms on any given terminal carbon atom of said C1-C6 alkyl has been replaced with ≡N.
As used herein the term “C1-C6alkylene-C3-C8cycloalkyl” refers to a C3-C8cycloalkyl as defined herein, wherein one of the hydrogen atoms of said C3-C8cycloalkyl has been replaced with a C1-C6alkylene as defined herein.
As used herein the term “C1-C6alkylene-3-10 membered heterocyclyl comprising 1 to 3 heteroatoms independently selected from N, O, S and P” refers to a 3-10 membered heterocyclyl comprising 1 to 3 heteroatoms independently selected from N, O, S and P as defined herein, wherein one of the hydrogen atoms of said 3-10 membered heterocyclyl comprising 1 to 3 heteroatoms independently selected from N, O, S and P has been replaced with a C1-C6alkylene as defined herein.
As used herein, the term “C1-C6alkylene-aryl” refers to aryl as defined herein, wherein one of the hydrogen atoms of said aryl has been replaced with a C1-C6alkylene as defined herein.
As used herein, the term “C1-C6alkylene-5-6 membered heteroaryl comprising 1 or 2 heteroatoms independently selected from N, O and S” refers to a 5-6 membered heteroaryl comprising 1 or 2 heteroatoms independently selected from N, O and S as defined herein, wherein one of the hydrogen atoms of said 5-6 membered heteroaryl comprising 1 or 2 heteroatoms independently selected from N, O and S has been replaced with a C1-C6alkylene as defined herein.
As used herein, the term “C(═O)—C1-C6alkyl” refers to a C1-C6alkyl radical as defined herein, which is attached to the rest of the molecule via a C(═O) linker.
As used herein, the term “C(═O)—O—C1-C6alkyl” refers to a “O—C1-C6alkyl” radical as defined herein, which is attached to the rest of the molecule via a C(═O) linker.
As used herein, the term “C(═O)—O—C1-C6alkylene-O—C1-C6alkyl” refers to a “O—C1-C6alkylene-O—C1-C6alkyl” radical as defined herein, which is attached to the rest of the molecule via a C(═O) linker.
As used herein, the term “N(C1-C6alkyl)2” refers to a radical which is connected to the rest of the molecule via the N atom, wherein the N atom is connected separately to two C1-C6 alkyl radicals as defined herein.
As used herein, the term “C(═O)—N(C1-C6alkyl)2” refers to a radical of the formula “N(C1-C6alkyl)2” as defined herein, which is attached to the rest of the molecule via a C(═O) linker.
As used herein, the term “NH(C1-C6alkyl)” refers to a radical which is connected to the rest of the molecule via the N atom, wherein the N atom is connected separately to i) a hydrogen atom, and ii) a C1-C6 alkyl radical as defined herein.
As used herein, the term “C(═O)NH(C1-C6alkyl)” refers to a radical of the formula “NH(C1-C6alkyl)” as defined herein, which is attached to the rest of the molecule via a C(═O) linker.
As used herein, the term “C(═O)—C1-C6alkylene-O—C1-C6alkyl” refers to a radical of the formula “C1-C6alkylene-O—C1-C6alkyl” as defined herein, which is attached to the rest of the molecule via a C(═O) linker.
As used herein, the term “C(═O)—C3-C8cycloalkyl” refers to “cycloalkyl” as defined herein having 3 to 8 ring atoms, which is attached to the rest of the molecule via a C(═O) linker.
As used herein, the term “C(═O)-3-10 membered heterocyclyl comprising 1 to 3 heteroatoms independently selected from N, O, S and P” refers to “heterocyclyl” as defined herein having 3 to 10 ring atoms, wherein from 1 to 3 of the ring atoms are heteroatoms selected from the group consisting of N, O, S and P (preferably 1 to 3 heteroatoms independently selected from N, O and S), which is attached to the rest of the molecule via a C(═O) linker.
As used herein, the term “C(═O)-aryl” refers to “aryl” as defined herein, and which is attached to the rest of the molecule via a C(═O) linker.
As used herein, the term “C(═O)-5-6 membered heteroaryl comprising 1 or 2 heteroatoms independently selected from N, O and S” refers to “5-6 membered heteroaryl” as defined herein, wherein said 5-6 membered heteroaryl contains 1 or 2 ring heteroatoms independently selected from the group consisting of N, O and S, and which is attached to the rest of the molecule via a C(═O) linker.
As used herein, the term “C1-C6alkylene-NR1AR1B” refers to a C1-C6alkyl radical as defined herein, wherein one of the hydrogen atoms of said C1-C6 alkyl radical has been replaced with NR1AR1B.
As used herein, a “NR1AR1B” substituent refers to a radical of the formula “N(R1A)(R1B)” wherein said radical is attached to the rest of the molecule by the nitrogen atom to which an R1A group and an R1B group are also separately attached, and wherein R1A and R1B may be the same or different, and are as defined herein.
As used herein, the term “C1-C6alkylene-[C1-C6alkylene-O—C1-C6alkyl]2,” refers to a C1-C6alkyl radical as defined herein, wherein two hydrogen atoms of said C1-C6 alkyl radical have each independently been replaced with a C1-C6alkylene-O—C1-C6alkyl group as defined herein.
As used herein, the term “C1-C6alkylene-C(═O)—O—C1-C6alkyl” refers to a C1-C6alkyl radical as defined herein, wherein one of the hydrogen atoms of said C1-C6 alkyl radical has been replaced with a C(═O)—O—C1-C6alkyl radical as defined herein.
As used herein, the term “C(═O)—C3-C8cycloalkyl” refers to a C3-C8cycloalkyl as defined herein and which is attached to the rest of the molecule via a C(═O) linker.
As used herein, the term “C(═O)—C1-C6haloalkyl” refers to a C1-C6haloalkyl as defined herein and which is attached to the rest of the molecule via a C(═O) linker.
As used herein, the term “C(═O)—C1-C6hydroxyalkyl” refers to a C1-C6hydroxyalkyl as defined herein and which is attached to the rest of the molecule via a C(═O) linker.
As used herein, the term “C3-C8hydroxycycloalkyl” refers to a C3-C8cycloalkyl as defined herein wherein one or more of the hydrogen atoms of the C3-C8cycloalkyl have been replaced by hydroxyl. As will be appreciated by one of normal skill in the art, only one hydrogen atom on any given carbon atom in said C3-C8cycloalkyl can be replaced by hydroxyl.
As used herein, the term “C1-C6alkylene-C3-C8hydroxycycloalkyl” refers to C1-C6alkyl as defined herein wherein one of the hydrogen atoms of said C1-C6 alkyl radical has been replaced with C3-C8hydroxycycloalkyl as defined herein.
As used herein, the term “substituent” refers to a radical group which replaces a hydrogen atom in a given molecule.
As used herein, the term “substituted by one or more substituents” includes substituted by 1, 2, 3, 4, 5, or 6 substituents. Preferably, it includes 1 substituent or 2 or 3 substituents. For the avoidance of doubt, this term also includes instances where 2 or 3 substituents may be present on the same carbon atom where valency allows. When multiple substituents are present, the substituents are selected independently unless otherwise indicated, so where 2 or 3 substituents are present, for example, those substituents may be the same or different.
As used herein, the term “C1-C6alkylene” refers to a straight-chain or branched divalent radical of an alkyl group having from 1 to 6 carbon atoms e.g., —CH2—, —CH2CH2—, and —CH2CH2CH2—.
As used herein, the term “O—C1-C6alkylene” or, equivalently “C1-C6alkylene-O” refers to C1-C6alkyl as defined herein wherein one of the hydrogen atoms of said C1-C6alkyl has been replaced with O.
As used herein, the term “C(═O)—C1-C6alkylene” or, equivalently, “C1-C6alkylene-C(═O)” refers to C1-C6alkyl as defined herein wherein one of the hydrogen atoms of said C1-C6alkyl has been replaced with C(═O).
As used herein, the term “C(═O)—O—C1-C6alkylene” or, equivalently, “C1-C6alkylene-O—C(═O)” refers to O—C1-C6alkylene as defined herein connected to the remainder of the molecule by a C(═O) linking group
As used herein, the term “C1-C6alkylene-C(═O)-3-10 membered heterocyclyl” refers to C(═O)-3-10 membered heterocyclyl as defined herein connected to the remainder of the molecule by a C1-C6alkylene linking group.
As used herein, the term “bridging group” refers to a mutual, connecting substituent of non-adjacent bridgehead ring atoms in a cyclic structure. For example, in the following structure
the “bridgehead ring atoms” are represented by 1 and 4, and the methylene group represented by 7 could be said to be the “bridging group”. In this situation, as used herein, the bridging group forms a C5cycloalkyl (i.e a 5-membered carbocyclic ring formed from atoms 1, 2, 3, 4 and 7 or formed from atoms 1, 4, 5, 6, 7).
As such, one example of a bridging group formed by two substituents on non-neighboring bridgehead ring atoms is methylene. In an alternative example, the “bridging group” is ethylene. In an additional example, the “bridging group” is C═O. In a yet alternative example, it is CH2—C(═O). Preferably, the “bridging group” is methylene or ethylene.
When a (secondary) ring is formed by two substituents on neighboring (primary) ring atoms, the (secondary) ring size is expressed herein as the total number of (secondary) ring atoms, including the two primary ring atoms. For example, taking the following structure:
Here, where R2 and R3 together form a C5cycloalkyl, the resulting structure would be
Likewise, when a (secondary) ring is formed by two substituents on the same (primary) ring atom, the (secondary) ring size is expressed herein as the total number of (secondary) ring atoms, including the primary ring atom. For example, taking the following structure:
Here, where the two R2 groups together form a C5cycloalkyl, the resulting structure would be
The term “fused bicyclic heteroaryl group” refers to a group comprising two rings joined through the sharing of one covalent bond, wherein the fused group is aromatic in nature (i.e. follows Huckel's rule) and comprises one to three ring heteroatoms selected from the group consisting of N, O and S. The fused bicyclic heteroaryl group is bonded to the remainder of the molecule through a carbon atom. An example of a fused bicyclic heteroaryl group is indole. For instance,
where R10 and R11 are joined together to form a 9 membered fused bicyclic aryl group, can be, as a (non-limiting) example,
The term “fused bicyclic aryl group” refers to a group comprising two rings joined through the sharing of one covalent bond, wherein the fused group is aromatic in nature (i.e. follows Huckel's rule) and comprises no heteroatoms. The fused bicyclic heteroaryl group is bonded to the remainder of the molecule through a carbon atom. An example of a fused bicyclic aryl group is naphthalene.
As used herein, the term “N(C1-C6alkyl)-C(═O)—C1-C6alkyl” refers to NH(C1-C6alkyl) as defined herein wherein the hydrogen atom directly attached to the N is replaced with a C(═O)—C1-C6alkyl group as defined herein.
As used herein, the term “N(C1-C6alkyl)-3-10 membered heterocyclyl” refers to NH(C1-C6alkyl) as defined herein wherein the hydrogen atom directly attached to the N is replaced with a 3-10 membered heterocyclyl as defined herein.
As used herein, the term “N(C1-C6alkyl)-C(═O)—C1-C6alkylene-O—C1-C6alkyl” refers to NH(C1-C6alkyl)2 as defined herein wherein the hydrogen atom directly attached to the N is replaced with C(═O)—C1-C6alkylene-O—C1-C6alkyl as defined herein.
As used herein, the term “3-10 membered heterocyclyl-O—C1-C6alkyl” refers to 3-10 membered heterocyclyl as used herein wherein a hydrogen atom in said 3-10 membered heterocyclyl has been replaced with O—C1-C6alkyl as used herein.
As used herein, the term “N(C1-C6alkylene-O—C1-C6alkyl)2” refers to a radical which is connected to the rest of the molecule via the N atom, wherein the N atom is connected separately to two C1-C6alkylene-O—C1-C6alkyl radicals as defined herein.
As used herein, the term “perdeuterated” means that all hydrogen atoms are replaced with deuterium.
The term “co-crystal” as used herein refers to a single crystalline phase comprising a plurality of different molecular or ionic compounds which are neither solvates nor simple salts.
The term “solvate” as used herein refers to a single crystalline phase (which may comprise a single molecular or ionic compound, or could equally be a co-crystal) containing disordered, partially ordered, or ordered solvent molecules, preferably wherein the solvent molecules are partially ordered or ordered. The solvent molecule can be water, in which case the “solvate” can also be referred to as a “hydrate”.
Depending on the choice of the starting materials and procedures, the compounds can be present in the form of one of the possible stereoisomers or as mixtures thereof, for example as pure optical isomers, or as stereoisomer mixtures, such as racemates, diastereoisomer and/or atropisomer mixtures, depending on the number of asymmetric carbon atoms. The present invention is, unless specified otherwise, meant to include all such possible stereoisomers, including racemic mixtures, diasteriomeric and atropisomeric mixtures and optically pure forms. Optically active (R)- and (S)-stereoisomers may be prepared using chiral synthons or chiral reagents, or resolved using conventional techniques. If the compound contains a double bond, the substituent may be E or Z configuration. If the compound contains a disubstituted cycloalkyl, the cycloalkyl substituent may have a cis- or trans-configuration. All tautomeric forms are also intended to be included.
As used herein, the terms “salt” or “salts” refers to an acid addition or base addition salt of a compound of the present invention. “Salts” include in particular “pharmaceutical acceptable salts”. The term “pharmaceutically acceptable salts” refers to salts that retain the biological effectiveness and properties of the compounds of this invention and, which typically are not biologically or otherwise undesirable. In many cases, the compounds of the present invention are capable of forming acid and/or base salts by virtue of the presence of amino and/or carboxyl groups or groups similar thereto. When both a basic group and an acid group are present in the same molecule, the compounds of the present invention may also form internal salts, e.g., zwitterionic molecules. Pharmaceutically acceptable acid addition salts can be formed with inorganic acids and organic acids. Inorganic acids from which salts can be derived include, for example, hydrochloric acid, hydrobromic acid, sulfuric acid, nitric acid, phosphoric acid, and the like. Organic acids from which salts can be derived include, for example, acetic acid, propionic acid, glycolic acid, oxalic acid, maleic acid, malonic acid, succinic acid, fumaric acid, tartaric acid, citric acid, benzoic acid, mandelic acid, methanesulfonic acid, ethanesulfonic acid, toluenesulfonic acid, sulfosalicylic acid, and the like. Pharmaceutically acceptable base addition salts can be formed with inorganic and organic bases. Inorganic bases from which salts can be derived include, for example, ammonium salts and metals from columns I to XII of the periodic table. In certain embodiments, the salts are derived from sodium, potassium, ammonium, calcium, magnesium, iron, silver, zinc, and copper; particularly suitable salts include ammonium, potassium, sodium, calcium and magnesium salts. Organic bases from which salts can be derived include, for example, primary, secondary, and tertiary amines, substituted amines including naturally occurring substituted amines, cyclic amines, basic ion exchange resins, and the like. Certain organic amines include isopropylamine, benzathine, cholinate, diethanolamine, diethylamine, lysine, meglumine, piperazine and tromethamine. In another aspect, the present invention provides compounds of the present invention in acetate, ascorbate, adipate, aspartate, benzoate, besylate, bromide/hydrobromide, bicarbonate/carbonate, bisulfate/sulfate, camphorsulfonate, caprate, chloride/hydrochloride, chlortheophyllonate, citrate, ethandisulfonate, fumarate, gluceptate, gluconate, glucuronate, glutamate, glutarate, glycolate, hippurate, hydroiodide/iodide, isethionate, lactate, lactobionate, laurylsulfate, malate, maleate, malonate, mandelate, mesylate, methylsulphate, mucate, naphthoate, napsylate, nicotinate, nitrate, octadecanoate, oleate, oxalate, palmitate, pamoate, phosphate/hydrogen phosphate/dihydrogen phosphate, polygalacturonate, propionate, sebacate, stearate, succinate, sulfosalicylate, sulfate, tartrate, tosylate trifenatate, trifluoroacetate or xinafoate salt form.
As used herein, the term nitrogen protecting group (PG) in a compound described herein and also as depicted in the Schemes, refers to a group that should protect the functional groups concerned against unwanted secondary reactions, such as acylations, etherifications, esterifications, oxidations, solvolysis and similar reactions. It may be removed under deprotection conditions. Depending on the protecting group employed, the skilled person would know how to remove the protecting group to obtain the free amine NH2 group by reference to known procedures. These include reference to organic chemistry textbooks and literature procedures such as J. F. W. McOmie, “Protective Groups in Organic Chemistry”, T. W. Greene and P. G. M. Wuts, “Greene's Protective Groups in Organic Synthesis”, and in “Methoden der organischen Chemie” (Methods of Organic Chemistry).
The term “stereoisomer” or “stereoisomers” refer to compounds, which have identical chemical constitution, but differ with regard to the arrangement of the atoms or groups in space.
The term “diastereoisomer” or “diastereomer” refers to stereoisomers not related as mirror images. Diastereoisomers are characterized by differences in physical properties, and by some differences in chemical behaviour. Mixtures of diastereomers may separate under analytical procedures such as chromatography or crystallisation.
The term “enantiomer” refers to one of a pair of molecular entities which are mirror images of each other and non-superimposable.
The term “enantiomeric mixture” refers to an enantiomerically enriched mixture, a composition that comprises a greater proportion or percentage of one of the enantiomers of the compounds of the invention, in relation to the other enantiomer, or a racemate.
The term “diastereomeric mixture” refers to a diastereomerically enriched mixture or a mixture of diastereoisomers of equal proportion.
The term “diastereomerically enriched” refers to a composition that comprises a greater proportion or percentage of one of the diastereomers of the compounds of the invention, in relation to the other diastereoisomer(s).
Where the absolute stereochemistry of the compounds, for instance in the Examples, is specified, the Cahn-Ingold-Prelog system is used for assigning stereochemical descriptors to the examples.
Any formula given herein is also intended to represent unlabeled forms as well as isotopically labeled forms of the compounds. Isotopically labeled compounds have structures depicted by the formulae given herein except that one or more atoms are replaced by an atom having a selected atomic mass or mass number. Isotopes that can be incorporated into compounds of the invention include, for example, isotopes of hydrogen. Further, incorporation of certain isotopes, particularly deuterium (i.e., 2H or D) may afford certain therapeutic advantages resulting from greater metabolic stability, for example increased in vivo half-life or reduced dosage requirements or an improvement in therapeutic index or tolerability. It is understood that deuterium in this context is regarded as a substituent of a compound of the present invention. The concentration of deuterium, may be defined by the isotopic enrichment factor. The term “isotopic enrichment factor” as used herein means the ratio between the isotopic abundance and the natural abundance of a specified isotope. If a substituent in a compound of this invention is denoted as being deuterium, such compound has an isotopic enrichment factor for each designated deuterium atom of at least 3500 (52.5% deuterium incorporation at each designated deuterium atom), at least 4000 (60% deuterium incorporation), at least 4500 (67.5% deuterium incorporation), at least 5000 (75% deuterium incorporation), at least 5500 (82.5% deuterium incorporation), at least 6000 (90% deuterium incorporation), at least 6333.3 (95% deuterium incorporation), at least 6466.7 (97% deuterium incorporation), at least 6600 (99% deuterium incorporation), or at least 6633.3 (99.5% deuterium incorporation). It should be understood that the term “isotopic enrichment factor” can be applied to any isotope in the same manner as described for deuterium. Other examples of isotopes that can be incorporated into compounds of the invention include isotopes of hydrogen, carbon, nitrogen, oxygen, phosphorous, fluorine, and chlorine, such as 3H, 11C, 13C, 14C, 15N, 18F, 31P, 32P, 35S, 36Cl, 123I, 124I, 125I respectively. Accordingly, it should be understood that the invention includes compounds that incorporate one or more of any of the aforementioned isotopes, including for example, radioactive isotopes, such as 3H and 14C, or those into which non-radioactive isotopes, such as 2H (D) and 13C are present. Such isotopically labelled compounds are useful in metabolic studies (with 14C), reaction kinetic studies (with, for example 2H or 3H), detection or imaging techniques, such as positron emission tomography (PET) or single-photon emission computed tomography (SPECT) including drug or substrate tissue distribution assays, or in radioactive treatment of patients. In particular, an 18F or labeled compound may be particularly desirable for PET or SPECT studies. Isotopically-labeled compounds of the present invention can generally be prepared by conventional techniques known to those skilled in the art or by processes analogous to those described in the accompanying Examples and Preparations using an appropriate isotopically-labeled reagent& in place of the non-labeled reagent previously employed. In general, the atoms described in formula (I) are not intended to be limited to particular isotopic forms. As used herein, the term “hydrogen” or “H” is intended to cover both “1H” and “2H”/“D” (and indeed even “3H”). On the contrary, the term “deuterium” or “D” refers specifically to “2H”. In one aspect the hydrogens in the compound of Formula (I) are present in their normal isotopic abundances. In a another embodiment, some or all the hydrogens are isotopically enriched in deuterium (D).
As used herein, the term “hydrogen” or “H” is intended to cover both “1H” and “2H”, i.e. “D” (and indeed even “3H”). The term “deuterium” or “D” refers specifically to “2H”. In one aspect the hydrogens in the compound of Formula (I) are present in their normal isotopic abundances. In a another embodiment, some or all the hydrogens are isotopically enriched in deuterium (D).
As used herein, the term “pharmaceutical composition” refers to a compound of the invention, or a pharmaceutically acceptable salt thereof, together with at least one pharmaceutically acceptable carrier, in a form suitable for oral or parenteral administration. As used herein, the term “pharmaceutically acceptable carrier” refers to a substance useful in the preparation or use of a pharmaceutical composition and includes, for example, suitable diluents, solvents, dispersion media, surfactants, antioxidants, preservatives, isotonic agents, buffering agents, emulsifiers, absorption delaying agents, salts, drug stabilizers, binders, excipients, disintegration agents, lubricants, wetting agents, sweetening agents, flavoring agents, dyes, and combinations thereof, as would be known to those skilled in the art (see, for example, Remington The Science and Practice of Pharmacy, 22nd Ed. Pharmaceutical Press, 2013, pp. 1049-1070).
In one aspect, the present invention provides a pharmaceutical composition comprising a compound of the present invention, or a pharmaceutically acceptable salt thereof, and a pharmaceutically acceptable carrier. In one embodiment, the composition comprises at least two pharmaceutically acceptable carriers, such as those described herein. The pharmaceutical composition can be formulated for particular routes of administration such as oral administration, parenteral administration (e.g. by injection, infusion, transdermal or topical administration), and rectal administration. Topical administration may also pertain to inhalation or intranasal application. The pharmaceutical compositions of the present invention can be made up in a solid form (including, without limitation, capsules, tablets, pills, granules, powders or suppositories), or in a liquid form (including, without limitation, solutions, suspensions or emulsions). Tablets may be either film coated or enteric coated according to methods known in the art. Typically, the pharmaceutical compositions are tablets or gelatin capsules comprising the active ingredient together with one or more of:
In an embodiment, the pharmaceutical compositions are capsules comprising the active ingredient only.
Tablets may be either film coated or enteric coated according to methods known in the art.
Suitable compositions for oral administration include an effective amount of a compound of the invention in the form of tablets, lozenges, aqueous or oily suspensions, dispersible powders or granules, emulsion, hard or soft capsules, or syrups or elixirs, solutions or solid dispersion. Compositions intended for oral use are prepared according to any method known in the art for the manufacture of pharmaceutical compositions and such compositions can contain one or more agents selected from the group consisting of sweetening agents, flavoring agents, coloring agents and preserving agents in order to provide pharmaceutically elegant and palatable preparations. Tablets may contain the active ingredient in admixture with nontoxic pharmaceutically acceptable excipients which are suitable for the manufacture of tablets. These excipients are, for example, inert diluents, such as calcium carbonate, sodium carbonate, lactose, calcium phosphate or sodium phosphate; granulating and disintegrating agents, for example, corn starch, or alginic acid; binding agents, for example, starch, gelatin or acacia; and lubricating agents, for example magnesium stearate, stearic acid or talc. The tablets are uncoated or coated by known techniques to delay disintegration and absorption in the gastrointestinal tract and thereby provide a sustained action over a longer period. For example, a time delay material such as glyceryl monostearate or glyceryl distearate can be employed. Formulations for oral use can be presented as hard gelatin capsules wherein the active ingredient is mixed with an inert solid diluent, for example, calcium carbonate, calcium phosphate or kaolin, or as soft gelatin capsules wherein the active ingredient is mixed with water or an oil medium, for example, peanut oil, liquid paraffin or olive oil.
Certain injectable compositions are aqueous isotonic solutions or suspensions, and suppositories are advantageously prepared from fatty emulsions or suspensions. Said compositions may be sterilized and/or contain adjuvants, such as preserving, stabilizing, wetting or emulsifying agents, solution promoters, salts for regulating the osmotic pressure and/or buffers. In addition, they may also contain other therapeutically valuable substances. Said compositions are prepared according to conventional mixing, granulating or coating methods, respectively, and contain about 0.1-75%, or contain about 1-50%, of the active ingredient.
Suitable compositions for transdermal application include an effective amount of a compound of the invention with a suitable carrier. Carriers suitable for transdermal delivery include absorbable pharmacologically acceptable solvents to assist passage through the skin of the host. For example, transdermal devices are in the form of a bandage comprising a backing member, a reservoir containing the compound optionally with carriers, optionally a rate controlling barrier to deliver the compound of the skin of the host at a controlled and predetermined rate over a pro-longed period of time, and means to secure the device to the skin.
Suitable compositions for topical application, e.g., to the skin and eyes, include aqueous solutions, suspensions, ointments, creams, gels or sprayable formulations, e.g., for delivery by aero-sol or the like. Such topical delivery systems will in particular be appropriate for dermal application, e.g., for the treatment of skin cancer, e.g., for prophylactic use in sun creams, lotions, sprays and the like. They are thus particularly suited for use in topical, including cosmetic, formulations well-known in the art. Such may contain solubilizers, stabilizers, tonicity enhancing agents, buffers and preservatives.
As used herein a topical application may also pertain to an inhalation or to an intranasal application. They may be conveniently delivered in the form of a dry powder (either alone, as a mixture, for example a dry blend with lactose, or a mixed component particle, for example with phospholipids) from a dry powder inhaler or an aerosol spray presentation from a pressurised container, pump, spray, atomizer or nebuliser, with or without the use of a suitable propellant.
The compounds of formula (I) in free form or in pharmaceutically acceptable salt form, exhibit valuable pharmacological properties, e.g. RAS-mutant inhibiting properties, e.g. as indicated in the in vitro tests as provided in the examples, and are therefore indicated for therapy or for use as research chemicals, e.g. as tool compounds.
Particularly interesting compounds of the invention have good potency in the biological assays described herein, in particular in the covalent competition assay as described herein. In another aspect, they should have a favourable safety profile. In another aspect, they should possess favourable pharmacokinetic properties.
Compounds of the present invention preferably have an IC 50 of less than 0.5 uM, more preferably of less than 0.1 uM.
Having regard to their activity as RAS mutant inhibitors, in particular, KRAS, HRAS or NRAS G12C mutant inhibitors, compounds of the formula (I) in free or pharmaceutically acceptable salt form, are useful in the treatment of conditions which are driven by KRAS, HRAS or NRAS G12C mutations, such as a cancer that is responsive (meaning especially in a therapeutically beneficial way) to inhibition of RAS mutant proteins, in particular, KRAS, HRAS or NRAS G12C mutant proteins, most especially a disease or disorder as mentioned herein below.
The pharmaceutical composition or combination of the present invention may, for example, be in unit dosage of about 1-1000 mg of active ingredient(s) for a subject of about 50-70 kg.
Compounds of the invention may be useful in the treatment of cancer. In particular, the compounds of the invention may be useful in the treatment of an indication which is selected from the group consisting of lung cancer (such as lung adenocarcinoma and non-small cell lung cancer), colorectal cancer (including colorectal adenocarcinoma), pancreatic cancer (including pancreatic adenocarcinoma), uterine cancer (including uterine endometrial cancer), rectal cancer (including rectal adenocarcinoma) and solid tumors.
The compounds of the invention may also be useful in the treatment of solid malignancies characterized by mutations of RAS.
The compounds of the invention may also be useful in the treatment of solid malignancies characterized by mutations of KRAS, in particular G12C mutations in KRAS.
The term “a therapeutically effective amount” of a compound of the present invention refers to an amount of the compound of the present invention that will elicit the biological or medical response of a subject, for example, reduction or inhibition of an enzyme or a protein activity, or ameliorate symptoms, alleviate conditions, slow or delay disease progression, or prevent a disease, etc.
As used herein, the term “subject” refers to primates (e.g., humans, male or female), dogs, rabbits, guinea pigs, pigs, rats and mice. In certain embodiments, the subject is a primate. In yet other embodiments, the subject is a human.
As used herein, the term “inhibit”, “inhibition” or “inhibiting” refers to the reduction or suppression of a given condition, symptom, or disorder, or disease, or a significant decrease in the baseline activity of a biological activity or process.
As used herein, the term “treat”, “treating” or “treatment” of any disease or disorder refers to alleviating or ameliorating the disease or disorder (i.e., slowing or arresting the development of the disease or at least one of the clinical symptoms thereof); or alleviating or ameliorating at least one physical parameter or biomarker associated with the disease or disorder, including those which may not be discernible to the patient.
As used herein, the term “prevent”, “preventing” or “prevention” of any disease or disorder refers to the prophylactic treatment of the disease or disorder; or delaying the onset or progression of the disease or disorder.
As used herein, a subject is “in need of” a treatment if such subject would benefit biologically, medically or in quality of life from such treatment.
As used herein, the term “a,” “an,” “the” and similar terms used in the context of the present invention (especially in the context of the claims) are to be construed to cover both the singular and plural unless otherwise indicated herein or clearly contradicted by the context.
All methods described herein can be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by context. The use of any and all examples, or exemplary language (e.g. “such as”, “for example”, “optionally” or “preferably”) provided herein is intended merely to better illuminate the invention and does not pose a limitation on the scope of the invention otherwise claimed.
Any asymmetric atom (e.g., carbon or the like) of the compound(s) of the present invention can be present in racemic or enantiomerically enriched, for example the (R)-, (S)- or (R,S)-configuration. In certain embodiments, each asymmetric atom has at least 50% enantiomeric excess, at least 60% enantiomeric excess, at least 70% enantiomeric excess, at least 80% enantiomeric excess, at least 90% enantiomeric excess, at least 95% enantiomeric excess, or at least 99% enantiomeric excess in the (R)- or (S)-configuration. Substituents at atoms with unsaturated double bonds may, if possible, be present in cis-(Z)- or trans-(E)-form.
Accordingly, as used herein a compound of the present invention can be in the form of one of the possible stereoisomers, rotamers, atropisomers, tautomers or mixtures thereof, for example, as substantially pure geometric (cis or trans) stereoisomers, diastereomers, optical isomers (antipodes), racemates or mixtures thereof.
Any resulting mixtures of stereoisomers can be separated on the basis of the physicochemical differences of the constituents, into the pure or substantially pure geometric or optical isomers, diastereomers, racemates, for example, by chromatography and/or fractional crystallization.
Any resulting racemates of compounds of the present invention or of intermediates can be resolved into the optical antipodes by known methods, e.g., by separation of the diastereomeric salts thereof, obtained with an optically active acid or base, and liberating the optically active acidic or basic compound. In particular, a basic moiety may thus be employed to resolve the compounds of the present invention into their optical antipodes, e.g., by fractional crystallization of a salt formed with an optically active acid, e.g., tartaric acid, dibenzoyl tartaric acid, diacetyl tartaric acid, di-O,O′-p-toluoyl tartaric acid, mandelic acid, malic acid or camphor-10-sulfonic acid. Racemic compounds of the present invention or racemic intermediates can also be resolved by chiral chromatography, e.g., high pressure liquid chromatography (HPLC) using a chiral adsorbent.
Typically, the compounds of formula (I) can be prepared according to the Schemes provided herein. The examples which outline specific synthetic routes, and the generic schemes below provide guidance to the synthetic chemist of ordinary skill in the art, who will readily appreciate that the solvent, concentration, reagent, protecting group, order of synthetic steps, time, temperature, and the like can be modified as necessary.
The compound of the present invention may be administered either simultaneously with, or before or after, one or more other therapeutic agent. The compound of the present invention may be administered separately, by the same or different route of administration, or together in the same pharmaceutical composition as the other agents. A therapeutic agent is, for example, a chemical compound, peptide, antibody, antibody fragment or nucleic acid, which is therapeutically active or enhances the therapeutic activity when administered to a patient in combination with a compound of the present invention. In embodiments of the invention, the other therapeutic agent may be an anti-cancer agent.
In one embodiment, the invention provides a product comprising a compound of the present invention and at least one other therapeutic agent as a combined preparation for simultaneous, separate or sequential use in therapy. In one embodiment, the therapy is the treatment of a disease or condition characterized by a KRAS HRAS or NRAS G12C mutation. Products provided as a combined preparation include a composition comprising the compound of the present invention and the other therapeutic agent(s) together in the same pharmaceutical composition, or the compound of the present invention and the other therapeutic agent(s) in separate form, e.g. in the form of a kit.
In one embodiment, the invention provides a pharmaceutical composition comprising a compound of the present invention and another therapeutic agent(s). Optionally, the pharmaceutical composition may comprise a pharmaceutically acceptable carrier, as described above.
In one embodiment, the invention provides a kit comprising two or more separate pharmaceutical compositions, at least one of which contains a compound of the present invention. In one embodiment, the kit comprises means for separately retaining said compositions, such as a container, divided bottle, or divided foil packet. An example of such a kit is a blister pack, as typically used for the packaging of tablets, capsules and the like.
The kit of the invention may be used for administering different dosage forms, for example, oral and parenteral, for administering the separate compositions at different dosage intervals, or for titrating the separate compositions against one another. To assist compliance, the kit of the invention typically comprises directions for administration.
The pharmaceutical composition or combination of the present invention may, for example, be in unit dosage of about 1-1000 mg of active ingredient(s) for a subject of about 50-70 kg.
In the combination therapies of the invention, the compound of the present invention and the other therapeutic agent may be manufactured and/or formulated by the same or different manufacturers. Moreover, the compound of the present invention and the other therapeutic may be brought together into a combination therapy: (i) prior to release of the combination product to physicians (e.g. in the case of a kit comprising the compound of the present invention and the other therapeutic agent); (ii) by the physician themselves (or under the guidance of the physician) shortly before administration; (iii) in the patient themselves, e.g. during sequential administration of the compound of the present invention and the other therapeutic agent.
The schemes provided herein are intended to represent single diastereomers/enantiomers as well as their isomeric mixtures. Separation of diastereomers/enantiomers may be performed according to techniques described herein.
The amine protecting group (also referred to herein as nitrogen protecting group) is referred to as “PG” in the Schemes below.
Several methods for preparing the compounds of this disclosure are described in the following schemes. Starting materials and intermediates are purchased, made from known procedures, or prepared as otherwise illustrated. In some cases, the order of carrying out the steps of reaction schemes may be varied to facilitate the reaction or to avoid unwanted reactions. The R groups and other variables in the Schemes correspond to those defined in Formula (I).
Scheme-1: A compound of Formula (I) as disclosed herein can be synthesised as outlined in Scheme-1. In step A, an appropriate halogenated heteroaromatic (1) such as 3-iodo-5-methyl-1H-pyrazole is alkylated with a suitably functionalized N-protected linker, for example with a tosylate in the presence of a base such as cesium carbonate in a solvent such as DMF to provide the halogenated heteroaromatic compound (2). In step B, compound (2) is reacted with a secondary amine coupling partner in a metal-catalysed carbon-nitrogen cross-coupling reaction in the presence of a palladium catalyst such as tBuXPhos-Pd-G3 or Pd(dba)2 and bis(3,5-bis(trifluoromethyl)phenyl)(2′,6′-bis(dimethylamino)-3,6-dimethoxybiphenyl-2-yl)phosphine (CAS: 1810068-30-4) in a solvent such as 1,4-dioxane (or toluene) with a base such as NaOtBu (or Phosphazene P2-Et) to provide compound (3). In step C, compound (3) is treated with a halogenating agent such as N-iodosuccinimide or N-bromosuccinimide in a solvent such as THF or CH3CN. In step D, the heteroaromatic substituent is introduced with a palladium cross-coupling reaction, using a suitably functionalized aryl or heteroaryl system, for example an heteroaryl boronate ester in the presence of a palladium catalyst such as RuPhos-Pd-G3/RuPhos or CataCXium-A-Pd-G3 (CAS: 1651823-59-4) in a solvent such as dioxane (or toluene or CPME) with a base such as K3PO4 (or KOH) to provide compound (5). Alternatively, compound (5) can also be prepared by performing Step C (with NBS) before Step B and then proceeding as described above. In step E, the protecting groups (PG) are removed under appropriate conditions. For example, the Boc group of compound (5) is removed using conditions known in the art, with an organic acid such as trifluoroacetic acid in a solvent such as dichloromethane or with a mineral acid such as sulfuric acid in a solvent such as 1,4-dioxane to provide compound (6). The heteroaryl introduced in Step D may also contain a protecting group (for example, THP) which is removed in the same reaction under the aforementioned conditions for cleaving the Boc group. In step F, compound (7) may be made by reaction of compound (6) with a compound of Formula (Ic) where XL is a leaving group, for example halo (such as chloro) in the presence of a suitable base (such as Hunig's base); or where XL is OH and the reaction is carried out under standard amide bond forming conditions for example in the presence of an amide coupling reagent such as HATU and a suitable base such DIPEA. For example, the acrylamide is introduced by treating compound (6) with acrylic acid in presence of a coupling agent such as propylphosphonic anhydride and a base such as DIPEA in a solvent such as methylene chloride to provide compound (7). Alternatively compound (6) can be treated with acryloyl chloride in the presence of a base such as aqueous sodium bicarbonate in a solvent such as THF. In step G, the mixture of atropisomers is separated using SFC or HPLC conditions with the appropriate column and eluent.
Compounds (1), (2), (3), (4), (5), (6) and (7) as shown and described above for Scheme-1 are useful intermediates for preparing compounds of Formula (I). In compounds (1), (2), (3), (4), (5), (6) and (7) of Scheme 1, Ring A, Ra, R6, R8, R9, R10, R11, G, X, Y and Z are defined according to any one of enumerated Embodiments 1 to 55.
Scheme-2: Scheme-2 provides an alternative method for preparation of compounds of Formula (Ia) as disclosed herein. In step A, the aldehyde (1) is coupled with an amine to provide compound (2). This reductive amination proceeds in the presence of a reducing agent such as sodium triacetoxyborohydride. The remaining steps B-F are analogous to steps C-G in Scheme-1 described above.
Compounds (1), (2), (3), (4), (5) and (6) as shown and described above for Scheme-2 are useful intermediates for preparing compounds of Formula (Ia). In compounds (1), (2), (3), (4), (5) and (6) of Scheme 2, Ring A, Ra, R6, R8, R9, R10, R11, G, X, Y and Z are defined according to any one of enumerated Embodiments 1 to 55.
Scheme-3: Scheme-3 provides an alternative method for preparation of a variety of compounds of Formula (Ib) as disclosed herein starting from a common amine compound (1). In one approach, amine (1) is reacted with an activated acid using a coupling reagent such as HATU in presence of base such as DIPEA in an inert solvent such as DMF to form an amide (2). In another approach, amine (1) is coupled to an aldehyde under reductive amination conditions in the presence of a reducing agent such as sodium triacetoxyborohydride. Amine (1) can also be reacted with an alkylating agent such as with (S)-(1,4-dioxan-2-yl)methyl 4-methylbenzenesulfonate in presence of Et3N in a solvent such as DMF; with an oxirane in presence of LiClO4 in DMF; with methyl alpha-bromoisobutyrate in presence of a base such as Cs2CO3 in a solvent such as DMF; and with 3-((phenylsulfonyl)methylene)oxetane in a solvent such as MeOH. In those cases where the alkylating agent contains a further reactive group such as an ester or a phenylsulfonyl group, an additional reaction (e.g. ester reduction with LiBH4 in THF or desulfonylation with magnesium) may be performed before proceeding with Step B. In another approach, arylation of amine (1) in a metal-catalysed carbon-nitrogen cross-coupling reaction in the presence of a palladium catalyst such as Pd(dba)2 and bis(3,5-bis(trifluoromethyl)phenyl)(2′,6′-bis(dimethylamino)-3,6-dimethoxybiphenyl-2-yl)phosphine (CAS: 1810068-30-4) in a solvent such as 1,4-dioxane with a base such as NaOtBu to provide compound (2). Alternatively, amine (1) is reacted with aryl or heteroaryl halide in presence of a base such as Et3N in a solvent such as EtOH. The remaining steps B-D are analogous to steps E-G in Scheme-1 described above.
Compounds (1), (2), (3) and (4) as shown and described above for Scheme-2 are useful intermediates for preparing compounds of Formula (Ib). In compounds (1), (2), (3) and (4) of Scheme 2, Ring A, Ra, R6, R8, R9, R10, R11, G, X, Y and Z are defined according to any one of enumerated Embodiments 1 to 55.
Compounds of the present invention can be prepared as described in the following Examples. Which are intended to illustrate the invention and are not to be construed as being limitations thereof. All starting materials, building blocks, reagents, acids, bases, dehydrating agents, solvents, and catalysts utilized to prepare the compounds of the present invention are either commercially available or can be produced by organic synthesis methods known to one of ordinary skill in the art. Furthermore, the compounds of the present invention can be produced by organic synthesis methods known to one of ordinary skill in the art as shown in the following examples.
The structures of all final products, intermediates and starting materials are confirmed by standard analytical spectroscopic characteristics, e.g., MS, IR, NMR. The absolute stereochemistry of representative examples of the preferred (most active) atropisomers has been determined by analyses of X-ray crystal structures of complexes in which the respective compounds are bound to the KRasG12C mutant. In all other cases where X-ray structures are not available, the stereochemistry has been assigned by analogy, assuming that, for each pair, the atropoisomer exhibiting the highest activity in the covalent competition assay has the same configuration as observed by X-ray. Where the absolute stereochemistry of the compounds in the Examples is specified, the Cahn-Ingold-Prelog system is used for assigning stereochemical descriptors to the examples.
In embodiments of the invention, compounds of formula (I) have an absolute configuration equivalent to the one depicted for Example 121b. As illustrated below, the absolute stereochemistry is assigned according to the Cahn-Ingold-Prelog rule. In this case, Example 121b (most active atropisomer) has the a(R) configuration and Example 121a (less active atropisomer) the a(S) configuration.
Mass spectra were acquired on LC-MS, SFC-MS, or GC-MS systems using electrospray, chemical and electron impact ionization methods with a range of instruments of the following configurations: Waters Acquity UPLC with Waters SQ detector. [M+H]+ refers to the protonated molecular ion of the chemical species.
NMR spectra were run with Bruker Ultrashield™400 (400 MHz), Bruker Ultrashield™600 (600 MHz) and Bruker Ascend™400 (400 MHz) spectrometers, both with and without tetramethylsilane as an internal standard. Chemical shifts (□-values) are reported in ppm downfield from tetramethylsilane, spectra splitting pattern are designated as singlet (s), doublet (d), triplet (t), quartet (q), multiplet, unresolved or more overlapping signals (m), broad signal (br). Solvents are given in parentheses. Only signals of protons that are observed and not overlapping with solvent peaks are reported.
Temperatures are given in degrees Celsius. If not mentioned otherwise, all evaporations are performed under reduced pressure, typically between about 15 mm Hg and 100 mm Hg (=20-133 mbar).
UPLC-MS-1a: Acquity HSS T3; particle size: 1.8 μm; column size: 2.1×50 mm; eluent A: H2O+0.05% HCOOH+3.75 mM ammonium acetate; eluent B: CH3CN+0.04% HCOOH; gradient: 5 to 98% B in 1.40 min then 98% B for 0.40 min; flow rate: 1 mL/min; column temperature: 60° C.
UPLC-MS-1b: Acquity HSS T3; particle size: 1.8 μm; column size: 2.1×50 mm; eluent A: H2O+0.05% HCOOH+3.75 mM ammonium acetate; eluent B: CH3CN+0.04% HCOOH; gradient: 5 to 98% B in 9.40 min then 98% B for 0.40 min; flow rate: 1 mL/min; column temperature: 60° C.
UPLC-MS-1c: Acquity HSS T3; particle size: 1.8 μm; column size: 2.1×50 mm; eluent A: H2O+0.05% HCOOH+3.75 mM ammonium acetate; eluent B: CH3CN+0.04% HCOOH; gradient: 5 to 98% B in 9.40 min then 98% B for 0.40 min; flow rate: 0.8 mL/min; column temperature: 50° C.
UPLC-MS-1d: Acquity HSS T3; particle size: 1.8 μm; column size: 2.1×100 mm; eluent A: H2O+0.05% HCOOH+3.75 mM ammonium acetate; eluent B: CH3CN+0.04% HCOOH; gradient: 5 to 98% B in 9.40 min then 98% B for 0.40 min; flow rate: 0.8 mL/min; column temperature: 60° C.
UPLC-MS-1e: Acquity HSS T3; particle size: 1.8 μm; column size: 2.1×50 mm; eluent A: H2O+0.05% HCOOH+3.75 mM ammonium acetate; eluent B: isopropanol+0.05% HCOOH; gradient: 5 to 98% B in 1.7 min then 98% B for 0.10 min; flow rate: 0.6 mL/min; column temperature: 80° C.
UPLC-MS-1f: Acquity HSS T3; particle size: 1.8 μm; column size: 2.1×100 mm; eluent A: H2O+0.05% HCOOH+3.75 mM ammonium acetate; eluent B: CH3CN+0.05% HCOOH; gradient: 5 to 60% B in 8.40 min then 98% B for 1 min; flow rate: 0.4 mL/min; column temperature: 80° C.
UPLC-MS-1q: Acquity HSS T3; particle size: 1.8 μm; column size: 2.1×50 mm; eluent A: H2O+0.05% HCOOH+3.75 mM ammonium acetate; eluent B: isopropanol+0.05% HCOOH; gradient: 5 to 98% B in 1.7 min then 98% B for 0.10 min; flow rate: 0.7 mL/min; column temperature: 80° C.
UPLC-MS-1h: Acquity HSS T3; particle size: 1.8 μm; column size: 2.1×100 mm; eluent A: H2O+0.05% HCOOH+3.75 mM ammonium acetate; eluent B: CH3CN+0.04% HCOOH; gradient: 5 to 98% B in 9.40 min then 98% B for 0.40 min; flow rate: 1 mL/min; column temperature: 60° C.
UPLC-MS-2a: Acquity BEH C18; particle size: 1.7 μm; column size: 2.1×50 mm; eluent A: H2O+4.76% isopropanol+0.05% HCOOH+3.75 mM ammonium acetate; eluent B: isopropanol+0.05% HCOOH; gradient: 1 to 98% B in 1.70 min then 98% B for 0.10 min; flow rate: 0.6 mL/min; column temperature: 80° C.
UPLC-MS-2b: Acquity BEH C18; particle size: 1.7 μm; column size: 2.1×50 mm; eluent A: H2O+0.05% HCOOH+3.75 mM ammonium acetate; eluent B: isopropanol+0.05% HCOOH; gradient: 5 to 98% B in 1.70 min then 98% B for 0.10 min; flow rate: 0.6 mL/min; column temperature: 80° C.
UPLC-MS-2c: Basic XBridge BEH C18; particle size: 2.5 μm; column size: 2.1×50 mm; eluent A: H2O+5 mM NH4OH; eluent B: CH3CN+5 mM NH4OH; gradient: 2 to 98% B in 1.40 min then 98% B for 0.60 min; flow rate: 1 mL/min; column temperature: 50° C.
UPLC-MS-2d: Acquity BEH C18; particle size: 1.7 μm; column size: 2.1×100 mm; eluent A: H2O+0.05% HCOOH+3.75 mM ammonium acetate; eluent B: isopropanol+0.05% HCOOH; gradient: 5 to 60% B in 8.40 min then 60 to 98% B in 1 min; flow rate: 0.4 mL/min; column temperature: 80° C.
UPLC-MS-2e: Acquity BEH C18; particle size: 1.7 μm; column size: 2.1×100 mm; eluent A: H2O+4.76% isopropanol+0.05% HCOOH+3.75 mM ammonium acetate; eluent B: isopropanol+0.05% HCOOH; gradient: 1 to 60% B in 8.40 min then 60 to 98% B in 1 min; flow rate: 0.4 mL/min; column temperature: 80° C.
UPLC-MS-2f: Acquity BEH C18; particle size: 1.7 μm; column size: 2.1×50 mm; eluent A: H2O+0.05% HCOOH+3.75 mM ammonium acetate; eluent B: isopropanol+0.05% HCOOH; gradient: 5 to 98% B in 1.70 min then 98% B for 0.10 min; flow rate: 0.7 mL/min; column temperature: 80° C.
UPLC-MS-3: Ascentis Express C18; particle size: 2.7 μm; column size: 2.1×50 mm; eluent A: H2O+4.76% isopropanol+0.05% HCOOH+3.75 mM ammonium acetate; eluent B: isopropanol+0.05% HCOOH; gradient: 1 to 50% B in 1.40 min, 50 to 98% B in 0.30 min, then 98% for 0.10 min; flow rate: 1 mL/min; column temperature: 80° C.
UPLC-MS-4: CORTECS C18+; particle size: 2.7 μm; column size: 2.1×50 mm; eluent A: H2O+4.76% isopropanol+0.05% HCOOH+3.75 mM ammonium acetate; eluent B: isopropanol+0.05% HCOOH; gradient: 1 to 50% B in 1.40 min, 50 to 98% B in 0.30 min, then 98% for 0.10 min; flow rate: 1 mL/min; column temperature: 80° C.
UPLC-MS-5: Acquity BEH C18; particle size: 1.7 μm; column size: 2.1×50 mm; eluent A: H2O+0.10% HCOOH+2.0 mM ammonium acetate; eluent B: CH3CN+0.10% HCOOH; gradient: 98:2 at 0.01 min up to 0.3 min, 50:50 at 0.6 min, 25:75 at 1.1 min, 0:100 at 2.0 min up to 2.70 min at flow rate: 0.60 mL/min, 98:2 at 2.71 min up to 3.0 min at Flow rate: 0.55 mL/min; column temperature: RT.
UPLC-MS-6: Acquity BEH C18; particle size: 1.7 μm; column size: 2.1×50 mm; eluent A: H2O+0.10% HCOOH+2.0 mM ammonium acetate; eluent B: CH3CN+0.10% HCOOH; gradient 50:50 at 0.01 min, 10:90 at 1.0 min, 0:100 at 1.5 min up to 4.50 min, 50:50 at 4.6 min up to 5.0 min; flow rate: 0.40 mL/min; column temperature: RT.
UPLC-MS-7: Acquity BEH C18; particle size: 1.7 μm; column size: 2.1×50 mm; eluent A: H2O+0.10% HCOOH+2.0 mM ammonium acetate; eluent B: CH3CN+0.1% HCOOH; gradient: 98:2 at 0.01 min up to 0.5 min, 10:90 at 5.0 min, 5:95 at 6.0 min until 7.0 min, 98:2 at 7.01 min up to 8.0 min; flow rate: 0.45 mL/min; column temperature: RT.
UPLC-MS-8: Acquity BEH C18; particle size: 1.7 μm; column size: 2.1×50 mm; eluent A: H2O+0.1% HCOOH+2.0 mM ammonium acetate/CH3CN (90:10); eluent B: CH3CN+0.10% HCOOH; gradient: 95:5 at 0.01 min, 0:100 at 0.40 min, 0:100 at 0.50 min (flow rate: 0.65 mL/min), 0:100 at 1.30 min (flow rate: 0.70 mL/min), 95:5 at 1.31 min up to 1.50 min (flow rate: 0.60 mL/min); column temperature: RT.
UPLC-MS-9: Acquity BEH C18; particle size: 1.7 μm; column size: 2.1×50 mm; eluent A: 2 mM ammonium acetate+0.1% HCOOH in water; eluent B: 0.1% HCOOH in CH3CN; gradient: 95:5 at 0.01 min (flow rate: 0.55 mL/min), 30:70 at 0.60 min (flow rate: 0.60 mL/min), 10:90 at 0.80 min (flow rate: 0.65 mL/min, 0:100 at 1.10 min up to 1.70 min (flow rate: 0.65 mL/min), 95:5 at 1.71 min up to 2.0 min (flow rate: 0.55 mL/min); column temperature: RT.
UPLC-MS-10: Waters, YMC Triart C18; particle size: 5 μm; column size: 150×4.6 mm; eluent A: 10 mM ammonium acetate; eluent B: CH3CN; gradient: 90:10 at 0.01 min, 10:90 at 5.0 min, 0:100 at 7.0 min up to 11.0 min, 90:10 at 11.01 min up to 12.0 min; flow rate: 1.0 mL/min; column temperature: RT.
UPLC-MS-11: Waters, YMC Triart C18 particle size: 5 μm; column size: 150×4.6 mm; eluent A: 10 mM ammonium acetate; eluent B: CH3CN; gradient: 100:0 at 0.01 min, 50:50 at 7.0 min, 0:100 at 9.0 min up to 11.0 min, 100:0 at 11.01 min up to 12.0 min; flow rate: 1.0 mL/min; column temperature: RT.
UPLC-MS-12: Waters, YMC Triart C18; particle size: 5 μm; column size: 150×4.6 mm; eluent A: [water+0.05% TFA]; eluent B: [CH3CN+0.05% TFA], gradient: 100/0 at 0.01 min, 50/50 at 7 min, 0/100 at 9 min; flow rate: 1.0 mL/min; column temperature: RT.
UPLC-MS-13: X-Bridge C18; particle size: 3.5 μm; 50×4.6 mm; eluent A: 5.0 mM ammonium bicarbonate in water; eluent B: CH3CN; gradient: 95:5 at 0.01 min, 10:90 at 5.0 min, 5:95 at 5.80 min until 7.20 min, 95:5 at 7.21 min up to 10.0 min; flow rate: 1 mL/min. column temperature: RT.
UPLC-MS-14: Waters, X-bridge C18; particle size: 5.0 μm; column size: 4.6×250 mm; Mobile phase; flow rate: 1 mL/min; Column temperature: RT.
UPLC-MS-15: Waters, X-Bridge C18; particle size: 3.5 um; column size: 50×4.6 mm; eluent: A: 5 mM ammonium bicarbonate in water/B: CH3CN, gradient: 95/5 at 0.01 min, 15/85 at 2.80 min, 5/95 at 3.50 min the hold for 1.5 min, 95/5 at 5.01 min then hold for 1 min; Flow rate: 1.0 mL/min; Column temperature: RT.
UPLC-MS-16: Waters, X-Bridge C18; particle size: 3.5 μm; column size: 50×4.6 mm; eluent A: 5 mM ammonium bicarbonate in water/B: CH3CN, gradient: 95/5 at 0.01 min, 10/90 at 3.50 min, 5/95 at 4.50 min hold for 1.5 min, 95/5 at 6.01 min hold for 2 min; Flow rate: 1.0 mL/min; Column temperature: RT.
UPLC-MS-17: Phenomenex, Gemini C6-Phenyl; particule size 3 μm; column size: 100×4.6 mm; eluent: A: [10 mM ammonium bicarbonate+0.1% HCO2H in Water]; eluent B: MeOH, gradient: 5 to 80% B in 3 min, 80 to 100% in 2 min, 100% for 1 min; flow rate: 1 mL/min, column temperature: RT.
UPLC-MS-18: Waters, X select phenyl hexyl; particle size: 5.0 μm; column size: 4.6×250 mm; Mobile phase; flow rate: 1 mL/min, column temperature: RT.
LCMS-19: Shimadzu LCMS-2020, Kinetex EVO C18; particule size 5 μm; column size: 30×2.1 mm; eluent A: 0.04% TFA in water; eluent B: 0.02% TFA in CH3CN; gradient: 95:5 at 0.00 min, 5:95 at 0.80 min, 5:95 at 1.20 min, 95:5 at 1.21 min, 95:5 at 1.55 min; flow rate: 1.5 mL/min, column temperature: 50° C.
MS-1: MS flow injection; eluent A: H2O+4.76% isopropanol+0.05% HCOOH+3.75 mM ammonium acetate; eluent B: isopropanol+0.04% HCOOH; gradient: isocratic 70% B for 0.8 min; flow rate: 0.4 mL/min.
Normal Phase Chromatoqraphy: Normal phase chromatography was run on silica gel using prepacked columns, as detailed below, or using glass columns following standard flash chromatography methodology, unless otherwise stated.
RP-HPLC-1: Gilson PLC 2020, column: Maisch Reprosil C18 5 μm, 250×30 mm, detection: UV 215 & 254 nM, mobile phase: A: water+0.1% TFA, B: acetonitrile; Gradient: 10 to 95% B in 25 min, flow: 35 mL/min.
RP-HPLC-2: ACCQ prep HP150, column: Waters Xbridge C18 5 μm, 50×100 mm, detection: ELSD and UV 220 nm and 210-450 nm, mobile phase, flow: 100 mL/min).
RP-HPLC-3: Waters, column: X-bridge C18 OBD 5 μm, 100×30 mm, detection UV, mobile phase; flow rate: 40 mL/min.
RP-HPLC-4: Gilson, column: SunFire C18 OBD 5 μM; 100×30 mm; detection UV 254 nM, mobile phase; flow rate: 40 mL/min; column temperature: 25° C.
RP-HPLC-5: Shimadzu LC-20AP; column: X-bridge C18 5 μm; 250×19 mm; detection UV 202 & 220 nM, mobile phase; flow rate: 15 mL/min; column temperature: 40° C.
RP-HPLC-6: Shimadzu LC-20AP; column: X-bridge C18 5 μm; 250×19 mm; detection UV 202 & 220 nM, mobile phase; flow rate: 13 mL/min; column temperature: 40° C.
RP-HPLC-7: Waters HPLC e2695; column: Waters X-Bridge C8 5 μm; 250×4.6 mm; detection: PDA; mobile phase; flow rate: 1 mL/min; column temperature: 25° C. RP-HPLC-8
RP-HPLC-8: Waters HPLC e2695; column: Waters X-Bridge C18 5 μm; 150×4.6 mm; detection: UV; mobile phase: (A: [water+0.1% NH3]/B: [CH3CN+0.1% NH3], gradient: 10 to 90% B in 5 min, 90 to 95% in 6 min with a plateau at 95% for 4 min); flow rate: 1 mL/min; column temperature: 25° C.
RP-HPLC-9: Waters HPLC e2695; column: Waters XBridge C18, 5 μm; 150×4.6 mm; detection: PDA; mobile phase; flow rate: 1.0 mL/min; column temperature: 25° C.
RP-HPLC-10: Agilent HPLC 1260 infinity series; column: YMC Triart C18, 5 μm; 150×4.6 mm; detection: PDA; mobile phase: (A: [water+0.1% HCOOH]/B: [CH3CN+0.1% HCOOH], gradient: 10 to 90% B in 5 min, 90 to 95% in 6 min with a plateau at 95% for 4 min); flow rate: 1.0 mL/min; column temperature: 25° C.
RP-HPLC-11: Waters, X select phenyl hexyl; particle size: 5.0 μm; column size: 4.6×250 mm, PDA; mobile phase; flow rate; column temperature: RT.
C-HPLC-1: column: Chiralpak IA 5 μm; 250×30 mm, detection UV 240 nM, mobile phase, flow rate: 20 mL/min. column temperature: RT.
C-HPLC-2: column: Chiralpak IA 5 μm, 250×4.6 mm, detection UV 220/254 nM, mobile phase, flow rate: 1 mL/min, column temperature: 25° C.
C-HPLC-3: column: Chiralpak IA 5 μm; 250×30 mm, detection UV 240 nM, mobile phase, flow rate: 15 mL/min. column temperature: RT.
C-HPLC-4: column: Chiralpak IC 5 μm; 250×20 mm; detection UV 270 nM, mobile phase; flow rate: 10 mL/min; column temperature: 25° C.
C-HPLC-5: column: Chiralpak IC-3 3 μm; 100×3 mm; detection UV 270 nM, mobile phase; flow rate: 0.42 mL/min; column temperature: 25° C.
C-HPLC-6: column: Chiralpak IC 5 μm; 250×4.6 mm; detection UV 240 nM, mobile phase; flow rate: 1 mL/min; column temperature: 25° C.
C-HPLC-7: column: Chiralpak IC 5 μm; 250×30 mm; detection UV 270 nM, mobile phase; flow rate: 20 mL/min; column temperature: 25° C.
C-HPLC-8: column: Chiralpak AD 5 μm; 250×30 mm; detection UV 230 nM, mobile phase; flow rate: 20 mL/min; column temperature: 25° C.
C-HPLC-9: column: Chiralpak AD-3 3 μm; 100×3 mm; detection UV 130 or 250 nM, mobile phase; flow rate: 0.42 mL/min; column temperature: 25° C.
C-HPLC-10: column: Chiralpak AD 5 μm; 250×25 mm; detection UV 230 nM, mobile phase; flow rate: 15 mL/min; column temperature: 25° C.
C-HPLC-11: column: Chiralpak IG-3 3 μm; 100×3 mm; mobile phase; flow rate: 0.42 mL/min; column temperature: 25° C.
C-HPLC-12: column: Chiralpak IG 5 μm; 250×20 mm; mobile phase; flow rate: 10 mL/min; column temperature: 25° C.
C-HPLC-13: column: Chiralpak ID 5 μm; 250×25 mm; detection UV 230 nM, mobile phase; flow rate: 15 mL/min; column temperature: RT.
C-HPLC-14: column: Chiralpak ID 5 μm; 250×30 mm; detection UV 230 nM, mobile phase; flow rate: 30 mL/min; column temperature: 30° C.
C-HPLC-15: column: Chiralpak ID 5 μm; 250×25 mm; detection UV 254 nM, mobile phase; flow rate: 10 mL/min; column temperature: RT.
C-HPLC-16: column: Chiralpak ID 5 μm; 250×4.6 mm; detection UV 254 nM, mobile phase; flow rate: 1 mL/min; column temperature: RT.
C-HPLC-17: column: Lux C2 5 μm; 250×30 mm; detection UV 210 nM, mobile phase; flow rate: 42 mL/min; column temperature: 25° C.
C-HPLC-18: column: Lux C2 5 μm; 150×4.6 mm; detection UV 254 nM, mobile phase; flow rate: 1 mL/min; column temperature: 25° C.
C-HPLC-19: column: Chiralpak AS 5 μm; 250×20 mm; detection UV 240 nM, mobile phase; flow rate: 10 mL/min; column temperature: 25° C.
C-HPLC-20: column: Chiralpak AS 3 μm; 100×3 mm; detection UV 240 nM, mobile phase; flow rate: 0.42 mL/min; column temperature: 25° C.
C-HPLC-21: column: Chiralcel OZ 5 μm; 250×20 mm; detection UV 280 nM, mobile phase; flow rate: 10 mL/min; column temperature: RT.
C-HPLC-22: column: Chiralcel OZ-3 3 μm; 100×3 mm; detection UV 254 nM, mobile phase; flow rate: 0.42 mL/min; column temperature: 25° C.
C-HPLC-23: Shimadzu LC-20AP; ChiralpakAD-H, 5 μm; 250×21 mm; detection: UV; mobile phase; flow rate: 20 mL/min; column temperature: 40° C.
C-HPLC-24: Agilent 1260 infinity HPLC; column: Chiralpak AD-H 5 μm; 250×4.6 mm; detection: PDA; mobile phase; flow rate: 1 mL/min; column temperature: 25° C.
C-HPLC-25: Shimadzu LC-20AP; column CHIRACEL OX-H 5 μm; 250×21 mm; detection UV 202 & 220 nM; mobile phase; flow rate; column temperature: 40° C.
C-HPLC-26: Agilent 1260 infinity; column Chiralpak OX-H 5 μm; 250×4.6 mm; detection: PDA; mobile phase; flow rate: 1 mL/min; column temperature: 25° C.
C-HPLC-27: Shimadzu LC-20AP; column Chiralpak IG 5 μm; 250×21 mm; detection UV 202 & 220 nM, mobile phase; flow rate: 22 mL/min; column temperature: 40° C.
C-HPLC-28: Shimadzu LC-20AP with UV detector; column: Chiralpak IG 5 μm; 250×21 mm; mobile phase; flow rate: 12 mL/min; column temperature: 40° C.
C-HPLC-29: Agilent 1260 infinity HPLC with PDA detector; column: Chiralpak IG 5 μm; 250×4.6 mm; mobile phase; flow rate: 1 mL/min; column temperature: 25° C.
C-HPLC-30: Shimadzu LC-20AP; column Chiralpak IBN 5 μm; 250×21 mm; detection; UV, mobile phase; flow rate: 22 mL/min; column temperature: 40° C.
C-HPLC-31: Agilent 1260 infinity HPLC; column Chiralpak IBN 5 μm; 250×4.6 mm; detection: PDA; mobile phase; flow rate: 1 mL/min; column temperature: 25° C.
C-HPLC-32: Shimadzu LC-20AP; column: Chiralpak IC 5 μm; 250×21 mm; detection: PDA; mobile phase; flow rate: 1 mL/min; column temperature: 40° C.
C-HPLC-33: Agilent 1260 infinity HPLC; column: Chiralpak IC 5 μm; 250×4.6 mm; detection: PDA; mobile phase; flow rate: 1 mL/min; column temperature: 25° C.
C-HPLC-34: Shimadzu LC-20AP; column: Chiralpak IH 5 μm; 250×21 mm; detection: UV; mobile phase; flow rate 20 mL/min; column temperature: 40° C.
C-HPLC-35: column: Lux Cellulose-2 5 μm; 250×20 mm; detection: UV; mobile phase; flow rate: 5.5 mL/min; column temperature: RT.
C-SFC-1: column: Amylose-C NEO 5 μm; 250×30 mm; mobile phase; flow rate: 80 mL/min; column temperature: 40° C.; back pressure: 120 bars.
C-SFC-2: column: Lux Amylose-1 5 μm; 250×30 mm; mobile phase; flow rate: 80 mL/min; column temperature: 40° C.; back pressure: 120 bars.
C-SFC-3: column: Chiralpak AD-H 5 μm; 100×4.6 mm; mobile phase; flow rate: 3 mL/min; column temperature: 40° C.; back pressure: 1800 psi.
C-SFC-4: column: Chiralpak AD-H 5 μm; 250×30 mm; mobile phase; flow rate: 80 mL/min; column temperature: 40° C.; back pressure: 120 bars.
C-SFC-5: column: Chiralpak IB 5 μm; 250×30 mm; mobile phase; flow rate: 80 mL/min; column temperature: 40° C.; back pressure: 120 bars.
C-SFC-6: column: Chiralpak IB 5 μm; 100×4.6 mm; mobile phase; flow rate: 3 mL/min; column temperature: 40° C.; back pressure: 1800 psi.
C-SFC-7: column: Chiralpak IG 5 μm; 250×30 mm; mobile phase; flow rate: 80 mL/min; column temperature: 40° C.; back pressure: 120 bars.
C-SFC-8: column: Chiralpak IG 5 μm; 100×4.6 mm; mobile phase; flow rate: 3 mL/min; column temperature: 40° C.; back pressure: 1800 psi.
C-SFC-9: column: Chiralpak IC 5 μm; 250×30 mm; mobile phase; flow rate: 60 mL/min; column temperature: 40° C.; back pressure: 105 bars.
C-SFC-10: column: Chiralpak IC 5 μm; 100×4.6 mm; mobile phase; flow rate: 3 mL/min; column temperature: 40° C.; back pressure: 1800 psi.
C-SFC-11: column: Lux Amylose-1 5 μm; 100×4.6 mm; mobile phase; flow rate: 3 mL/min; column temperature: 40° C.; back pressure: 1800 psi.
C-SFC-12: column: Chiralpak AY 10 μm; 300×50 mm; mobile phase; flow rate: 200 mL/min; column temperature: 38° C.; back pressure: 100 bars.
C-SFC-13: column: (S,S) Whelk O1 10 μm; 300×50 mm I.D.; mobile phase; flow rate: 200 mL/min; column temperature: 38° C.; back pressure: 100 bars.
C-SFC-14: column: Chiralpak IG 3 μm; 100×4.6 mm I.D.; mobile phase; flow rate: 2.5 mL/min; column temperature: 35° C.; back pressure: 100 bars.
C-SFC-15: column: Lux i-Cellulose-5 5 μm; 250×30 mm; mobile phase; flow rate: 80 mL/min; column temperature: 40° C.; back pressure: 120 bars.
C-SFC-16: column: Chiralpak IG 5 μm; 250×30 mm; mobile phase; flow rate: 70 mL/min; column temperature: 40° C.; back pressure: 120 bars.
C-SFC-17: column: (S,S) Whelk O1 5 μm; 250×4.6 mm I.D.; mobile phase; flow rate: 2.5 mL/min; column temperature: 35° C.; back pressure: 100 bars.
C-SFC-18: column: Lux Cellulose-2 5 μm; 250×30 mm; mobile phase; flow rate: 80 mL/min; column temperature: 40° C.; back pressure: 120 bars.
C-SFC-19: column: Lux Cellulose-2 (OZ) 5 μm; 100×4.6 mm; mobile phase; flow rate: 3 mL/min; column temperature: 40° C.; back pressure: 1800 psi.
C-SFC-20: column: Lux Amylose-1 5 μm; 250×30 mm; mobile phase; flow rate: 90 mL/min; column temperature: 40° C.; back pressure: 105 bars.
C-SFC-21: column: Chiralpak IG 10 μm; 300×50 mm; mobile phase; flow rate: 200 mL/min; column temperature: 38° C.; back pressure: 100 bars.
C-SFC-22: column: Chiralpak IG 3 μm; 100×4.6 mm; mobile phase; flow rate: 2.5 mL/min; column temperature: 35° C.; back pressure: 100 bars.
C-SFC-23: column: Chiralpak AD-H 5 μm; 250×30 mm; mobile phase; flow rate: 90 mL/min; column temperature: 40° C.; back pressure: 140 bars.
C-SFC-24: column: Chiralpak IB 5 μm; 250×30 mm; mobile phase; flow rate: 75 mL/min; column temperature: 40° C.; back pressure: 100 bars.
C-SFC-25: column: Chiralpak AD-H 5 μm; 250×30 mm; mobile phase; flow rate: 80 mL/min; column temperature: 40° C.; back pressure: 130 bars.
C-SFC-26: column: Chiralpak IG 5 μm; 230×30 mm; mobile phase; flow rate: 80 mL/min; column temperature: 40° C.; back pressure: 120 bars.
C-SFC-27: column: Chiralpak IB-N 5 μm; 250×30 mm; mobile phase; flow rate: 90 mL/min; column temperature: 40° C.; back pressure: 120 bars.
C-SFC-28: column: Chiralpak Chiralcel OD 10 μm; 250×30 mm; mobile phase; flow rate: 70 mL/min; column temperature: 38° C.; back pressure: 100 bars.
C-SFC-29: column: Chiralcel OD-3 3 μm; 150×4.6 mm; mobile phase; flow rate: 2.5 mL/min; column temperature: 35° C.; back pressure: 1500 psi.
C-SFC-30: column: Chiralpak AD-H 5 μm; 250×30 mm; mobile phase; flow rate: 90 mL/min; column temperature: 40° C.; back pressure: 105 bars.
C-SFC-31: column: Chiralpak OX 5 μm; 100×4.6 mm; mobile phase; flow rate: 4 mL/min; column temperature: 40° C.; back pressure: 2500 psi.
C-SFC-32: column: Lux Cellulose-2 5 μm; 250×30 mm; mobile phase; flow rate: 90 mL/min; column temperature: 40° C.; back pressure: 105 bars.
C-SFC-33: column: Chiralpak AD-H 5 μm; 250×30 mm; mobile phase; flow rate: 80 mL/min; column temperature: 40° C.; back pressure: 140 bars.
C-SFC-34: column: Lux Amylose-1 5 μm; 250×30 mm; mobile phase; flow rate: 90 mL/min; column temperature: 40° C.; back pressure: 120 bars.
C-SFC-35: column: Chiralpak AD-H 5 μm; 250×30 mm; mobile phase; flow rate: 80 mL/min; column temperature: 40° C.; back pressure: 110 bars.
C-SFC-36: column: Lux Cellulose-2 5 μm; 250×30 mm; mobile phase; flow rate: 100 mL/min; column temperature: 40° C.; back pressure: 105 bars.
C-SFC-37: column: Lux Cellulose-2 5 μm; 100×4.6 mm; mobile phase; flow rate: 3 mL/min; column temperature: 40° C.; back pressure: 124 bars.
C-SFC-38: column: Chiralpak AS 10 μm; 250×30 mm; mobile phase; flow rate: 80 mL/min; column temperature: 38° C.; back pressure: 100 bars.
C-SFC-39: column: Chiralpak AS 3 μm; 150×4.6 mm; mobile phase; flow rate: 2.5 mL/min; column temperature: 35° C.; back pressure: 100 bars.
C-SFC-40: column: Lux Cellulose-2 3 μm; 150×4.6 mm; mobile phase; flow rate: 2.5 mL/min; column temperature: 35° C.; back pressure: 100 bars.
C-SFC-41: column: Chiralpak IG 10 μm; 250×50 mm; mobile phase; flow rate: 250 mL/min; column temperature: 35° C.; back pressure: 100 bars.
C-SFC-42: column: Chiralpak IG-3 3 μm; 50×4.6 mm; mobile phase; flow rate: 3 mL/min; column temperature: 35° C.; back pressure: 100 bars.
C-SFC-43: column: Chiralpak IG 10 μm; 250×30 mm; mobile phase; flow rate: 200 mL/min; column temperature: 35° C.; back pressure: 100 bars.
C-SFC-44: column: Lux Cellulose-2 5 μm; 250×30 mm; mobile phase; flow rate: 80 mL/min; column temperature: 40° C.; back pressure: 110 bars.
C-SFC-45: column: Chiralpak AY 5 μm; 250×30 mm; mobile phase; flow rate: 50 mL/min; column temperature: 38° C.; back pressure: 100 bars.
C-SFC-46: column: Chiralcel OZ 5 μm; 100×4.6 mm; mobile phase; flow rate: 3 mL/min; column temperature: 40° C.; back pressure: 100 bars.
C-SFC-47: Waters PSFC-200; column: CHIRALCEL OX-H 5 μm; 250×21 mm; detection UV, mobile phase; flow rate: 80 mL/min; column temperature: 40° C.; back pressure: 100 bars.
C-SFC-48: Waters SFC investigator; column: Chiralcel OX-H; 5 μm; 250×4.6 mm; detection: PDAmobile phase; flow rate: 4 mL/min; column temperature: 40° C.; back pressure: 100 bars.
C-SFC-49: Waters SFC investigator with PDA detector; column: Chiralpak AD-H 5 μm; 250×4.6 mm; mobile phase; flow rate: 4 mL/min; column temperature: 40° C.; back pressure: 100 bars.
C-SFC-50: Waters SFC 200 with UV detector; column: Chiralpak IG; 5 μm; 250×21 mm; mobile phase; flow rate: 80 mL/min; column temperature: 40° C.; back pressure: 100 bars.
C-SFC-51: Waters SFC investigator with PDA detector; column: Chiralpak IG 5 μm; 250×4.6 mm; mobile phase; flow rate: 4 mL/min; column temperature: 40° C.; back pressure: 100 bars.
C-SFC-52: Waters SFC 200 with UV detector; column: Chiralpak IC 5 μm; 250×21 mm; mobile phase; flow rate: 80 mL/min; column temperature: 40° C.; back pressure: 100 bars.
C-SFC-53: Waters SFC investigator with PDA detector; column: Chiralpak IC 5 μm; 250×4.6 mm; mobile phase; flow rate: 4 mL/min; column temperature: 40° C.; back pressure: 100 bars.
C-SFC-54: Waters SFC 200 with UV detector; column: Chiralpak IB-N 5 μm; 250×21 mm; mobile phase; flow rate: 80 mL/min; column temperature: 40° C.; back pressure: 100 bars.
C-SFC-55: Waters SFC investigator with PDA detector; column: Chiralpak IB-N 5 μm; 250×4.6 mm; mobile phase; flow rate: 4 mL/min; column temperature: 40° C.; back pressure: 100 bars.
Abbreviations used are those conventional in the art.
The asterisk * indicated in the name of a compound indicates relative stereochemistry e.g. (3aS*,7aS*)-5-(1-(2-acryloyl-2-azaspiro[3.3]heptan-6-yl)-4-(5-chloro-6-methyl-1H-indazol-4-yl)-5-methyl-1H-pyrazol-3-yl)-2-methyloctahydro-1H-pyrrolo[3,4-c]pyridin-1-one indicates either (3a5,7a5)-5-(1-(2-acryloyl-2-azaspiro[3.3]heptan-6-yl)-4-(5-chloro-6-methyl-1H-indazol-4-yl)-5-methyl-1H-pyrazol-3-yl)-2-methyloctahydro-1H-pyrrolo[3,4-c]pyridin-1-one or (3aR,7aR)-5-(1-(2-acryloyl-2-azaspiro[3.3]heptan-6-yl)-4-(5-chloro-6-methyl-1H-indazol-4-yl)-5-methyl-1H-pyrazol-3-yl)-2-methyloctahydro-1H-pyrrolo[3,4-c]pyridin-1-one.
A mixture of tert-butyl 6-(3-(4-acetyl-2,2-dimethylpiperazin-1-yl)-4-bromo-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Intermediate C10, 2.47 g, 4.84 mmol), 5,6-dimethyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1-tosyl-1H-indazole (Intermediate D5, 2.48 g, 5.81 mmol), RuPhos (226 mg, 0.48 mmol) and RuPhos-Pd-G3 (405 mg, 0.48 mmol) in dioxane (50 mL) was treated with K3PO4 (2M aq., 9.68 mL, 14.5 mmol) and the mixture was stirred at 80° C. for 1 h. The reaction mixture was poured into a sat. aq. NaHCO3 solution and extracted with EtOAc (3×). The combined organic layers were dried (MgSO4) and concentrated. The crude residue was diluted with THF (100 mL), SiliaMetS®Thiol (1.94 mmol) was added and the mixture swirled for 1 h at 40° C. The mixture was filtered, washed through with THF and the filtrate was concentrated. The crude residue was purified by normal phase chromatography (eluent: 8/2 MTBE/iPrOH in heptane 0 to 53%) to give the title compound as a beige foam. UPLC-MS-1a: Rt=1.41 min; MS m/z [M+H]+ 730.6.
A mixture of tert-butyl 6-(3-(4-acetyl-2,2-dimethylpiperazin-1-yl)-4-(5,6-dimethyl-1-tosyl-1H-indazol-4-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 1, 2.59 g, 3.55 mmol), NaOH (2N aq., 8.87 mL, 17.7 mmol) and dioxane (35 mL) was stirred at 60° C. for 4 h and then at 75° C. for 3 h. The reaction mixture was cooled to RT, diluted with water and extracted with EtOAc (2×). The combined organic layers were washed with brine, dried (Na2SO4) and concentrated. The isomers were separated by chiral SFC (C-SFC-4; mobile phase: 35:65 IPA/CO2) to give the title compound as the second eluting peak: UPLC-MS-1a: Rt=1.18 min; MS m/z [M+H]+ 576.5; C-SFC-3 (mobile phase: 35:65 IPA/CO2): Rt=2.58 min. The other isomer was obtained as the first eluting peak: C-SFC-3 (mobile phase: 35:65 IPA/CO2): Rt=1.01 min.
A solution of tert-butyl 6-(3-(4-acetyl-2,2-dimethylpiperazin-1-yl)-4-(5,6-dimethyl-1H-indazol-4-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 2 second eluting isomer, 1.14 g, 1.96 mmol) in CH2Cl2 (20 mL) was treated with TFA (3.78 mL, 49.0 mmol) and the mixture was stirred at RT for 2 h. The reaction mixture was poured into a mixture of sat. aq. NaHCO3 and EtOAc, stirred for 15 min, saturated with NaCl and then the mixture was extracted with EtOAc (4×). The combined organic layers were dried (Na2SO4) and concentrated to give the title compound as a yellow foam which was used without purification in the next step. UPLC-MS-1a: Rt=0.68 min; MS m/z [M+H]+ 476.4.
A solution of 1-(4-(4-(5,6-dimethyl-1H-indazol-4-yl)-5-methyl-1-(2-azaspiro[3.3]heptan-6-yl)-1H-pyrazol-3-yl)-3,3-dimethylpiperazin-1-yl)ethan-1-one (Step 3, 1.96 mmol) in THF (59 mL) was treated with NaHCO3 (0.5M aq., 11.8 mL, 5.90 mmol) and the mixture was cooled to 0° C. Acryloyl chloride (0.17 mL, 2.06 mmol) was added in 4 portions within 2 min, followed by additional acryloyl chloride (0.03 mL, 0.39 mmol) 15 min later. After 30 min, the reaction mixture was diluted with 1M aq. NaHCO3 and extracted with EtOAc (2×). The combined organic phases were washed with brine, dried (Na2SO4) and concentrated. The residue was dissolved in MeOH (20 mL), stirred at 40° C. for 10 min until disappearance (UPLC) of the side product resulting from reaction of the acryloyl chloride with the indazole NH. The mixture was concentrated and the residue was diluted with 1:1 water/brine and extracted with EtOAc (2×). The combined organic layers were washed with brine, dried (Na2SO4) and concentrated. The crude residue was purified by normal phase chromatography (eluent: CH2Cl2/MeOH/Et3N/(200:20/2) in CH2Cl2 from 0 to 100%) to give after lyophilization (from t-BuOH) Example 1a as a white solid: 1H NMR (400 MHz, DMSO-d6) δ 12.71 (s, 1H), 7.47 (s, 1H), 7.27 (s, 1H), 6.29 (m, 1H), 6.09 (m, 1H), 5.67 (m, 1H), 4.73 (m, 1H), 4.34 (s, 1H), 4.28 (s, 1H), 4.05 (s, 1H), 3.99 (s, 1H), 2.96-3.21 (m, 4H), 2.60-2.83 (m, 6H), 2.38 (s, 3H), 2.10 (s, 3H), 1.92 (s, 6H), 1.00-1.12 (m, 6H); UPLC-MS-1a: Rt=0.93 min; MS m/z [M+H]+ 530.4; C-SFC-3 (mobile phase 45:55 (IPA+0.1% NH3)/CO2): Rt=1.85 min.
Example 1b: was prepared by a similar method using tert-butyl 6-(3-(4-acetyl-2,2-dimethylpiperazin-1-yl)-4-(5,6-dimethyl-1H-indazol-4-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 2 first eluting isomer): C-SFC-3 (mobile phase 45:55 (IPA+0.1% NH3)/CO2): Rt=0.72 min.
Method-1a: similar to Method-1 except that the 2 isomers were separated after the last step (Step 4).
The following examples 2a to 5 were prepared using analogous methods to Method-1 from intermediates (in Step 1) described in the intermediates synthesis section or commercially available.
In a vial, to a solution of tert-butyl 6-(4-bromo-3-iodo-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Intermediate C5, 300 mg, 0.62 mmol), 4,5,6,7-tetrahydropyrazolo[1,5-a]pyrazine dihydrochloride (207 mg, 1.06 mmol), tBuXPhos-Pd-G3 (49.4 mg, 0.062 mmol) in THF (4.5 mL) was added Phosphazene P2-Et (CAS: 165535-45-5, 0.93 mL, 2.80 mmol). The vial was flushed with argon and stirred at 80° C. for 15 h. The reaction mixture was poured into water and extracted with CH2Cl2 (×3). The combined organic extracts were dried (phase separator) and evaporated. The crude residue was purified by normal flash chromatography (eluent: EtOAc in c-hexane 0 to 60%) to give the title compound as a yellow foam. UPLC-MS-1a: Rt=1.22 min; MS m/z [M+H]+ 477.3/479.3.
In a vial were added tert-butyl 6-(4-bromo-3-(6,7-dihydropyrazolo[1,5-a]pyrazin-5(4H)-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 1, 235 mg, 0.49 mmol), 5-chloro-6-methyl-1-(tetrahydro-2H-pyran-2-yl)-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-indazole (Intermediate D1, 185 mg, 0.49 mmol), RuPhos (11.5 mg, 0.025 mmol) and RuPhos-Pd-G3 (20.6 mg, 0.025 mmol). The vial was flushed with argon, dioxane (3.70 mL) and K3PO4 (1.5 M in water, 0.98 mL, 1.48 mmol) were added and the reaction mixture was stirred at 80° C. for 4 h. The reaction mixture was poured into a sat. aq. NaHCO3 solution and extracted with EtOAc (×3). The combined organic extracts were dried (phase separator) and evaporated. The crude residue was diluted in THF (4 mL), SiliaMetS®Thiol (0.10 mmol) was added and the mixture swirled for 1 h at 40° C. The mixture was filtered, the filtrate was concentrated and the crude residue was purified by normal phase chromatography (eluent: MeOH in CH2Cl2 from 0 to 4%) to give the title compound as white foam. UPLC-MS-1a: Rt=1.41 and 1.43 min; MS m/z [M+H]+ 647.4/649.4.
To a solution of tert-butyl 6-(4-(5-chloro-6-methyl-1-(tetrahydro-2H-pyran-2-yl)-1H-indazol-4-yl)-3-(6,7-dihydropyrazolo[1,5-a]pyrazin-5(4H)-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 2, 143 mg, 0.22 mmol) in dioxane (2 mL) was added H2SO4 (0.21 mL, 3.98 mmol) and the reaction mixture was stirred at RT for 16 h. The reaction mixture was diluted with CH2Cl2 and poured into water. The layers were separated and the aqueous one was back extracted with CH2Cl2. NaOH (1N aq., 13.3 mL) and CH2Cl2 were added to the aqueous layer, the layers were separated and the aqueous layer was back extracted with CH2Cl2 (×2). The combined organic extracts were dried (phase separator) and concentrated in vacuo to give the title compound as a beige foam. UPLC-MS-1a: Rt=0.68 min; MS m/z [M+H]+ 463.3/465.2.
To an ice-cooled solution of 5-(4-(5-chloro-6-methyl-1H-indazol-4-yl)-5-methyl-1-(2-azaspiro[3.3]heptan-6-yl)-1H-pyrazol-3-yl)-4,5,6,7-tetrahydropyrazolo[1,5-a]pyrazine (Step 3, 65.0 mg, 0.14 mmol) and NaHCO3 (54.3 mg, 0.65 mmol) in THF (5.20 mL) and water (1.16 mL) was added acryloyl chloride (0.02 mL, 0.26 mmol). The reaction mixture was stirred at 0-5° C. under nitrogen atmosphere for 1.15 h. Acryloyl chloride (5 μL, 0.06 mmol) was added again to complete the reaction. MeOH (0.5 mL) was added at 0-5° C. and the mixture was stirred for 1.5 h until disappearance (UPLC) of the side product resulting from reaction of the acryloyl chloride with the indazole NH. The reaction mixture was poured into a sat. aq. NaHCO3 solution and extracted with CH2Cl2 (×3). The combined organic extracts were dried (phase separator) and evaporated. The crude residue was purified by normal phase chromatography (eluent: MeOH in CH2Cl2 0 to 6%) to give the title compound. The isomers were separated by chiral SFC (C-SFC-5; mobile phase: CO2/MeOH 63/37) to give after lyophilization (CH3CN/water) the title compound Example 10b as the second eluting peak (white solid): 1H NMR (600 MHz, DMSO-d6) δ 13.1 (s, 1H), 7.63 (s, 1H), 7.53 (s, 1H), 7.32 (s, 1H), 6.31 (m, 1H), 6.10 (m, 1H), 5.98 (s, 1H), 5.72 (m, 1H), 4.73 (m, 1H), 4.34 (s, 1H), 4.27-4.25 (m, 2H), 4.19 (dd, 1H), 4.05 (s, 1H), 4.00 (s, 1H), 3.85 (m, 1H), 3.62 (m, 1H), 3.21-3.12 (m, 2H), 2.78-2.66 (m, 4H), 2.50 (s, 3H), 1.96 (s, 3H). UPLC-MS-1 b: Rt=4.45 min; MS m/z [M+H]+ 517.3/519.3. C-SFC-6 (mobile phase: CO2/MeOH 60/40): Rt=2.40 min. The other isomer Example 10a was obtained as the first eluting peak: C-SFC-6 (mobile phase: CO2/MeOH 60/40): Rt=1.45 min.
Method-2a: similar to Method-2 except that Step 3 was performed using TFA in CH2Cl2 as described in Method-3 Step 4.
The following examples 11a to 12 were prepared using analogous methods to method-2 from intermediates (in Step 1) described in the intermediates synthesis section or commercially available.
To a solution of tert-butyl 6-(3-bromo-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Intermediate C1, 1.40 g, 3.93 mmol) and 1-((3R,5S)-3,5-dimethylpiperazin-1-yl)ethan-1-one (Intermediate A10, 0.74 g, 4.72 mmol) in dioxane (18 mL) under nitrogen atmosphere were added tBuXPhos-Pd-G3 (0.25 g, 0.31 mmol) and NaOtBu (2M in THF, 5.89 mL, 11.8 mmol). The reaction mixture was stirred at 85° C. for 16 h. The RM was quenched by addition a sat. aq. NaHCO3 solution and extracted with AcOEt (×2). The combined organic extracts were dried (Na2SO4), filtered and evaporated. The crude residue was purified by normal phase chromatography (eluent: MeOH in CH2Cl2 from 0 to 4%) to give the title compound as a beige foam. UPLC-MS-2b: Rt=1.01 min; MS m/z [M+H]+ 432.6.
To a solution of tert-butyl 6-(3-((2R,6S)-4-acetyl-2,6-dimethylpiperazin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 1, 234 mg, 0.54 mmol) in THF (5.42 mL) at 0° C. under nitrogen atmosphere was added NBS (101 mg, 0.57 mmol) and the reaction mixture was stirred at 0° C. for 1 h. The RM was poured into water, extracted with CH2Cl2 (2×) and the combined organic extracts were washed with a sat. aq. NaHCO3 solution, dried (Na2SO4), filtered and evaporated to give the title compound as a beige foam. UPLC-MS-2b: Rt=1.12 min; MS m/z [M+H]+ 510.2/512.2.
To tert-butyl 6-(3-((2R,6S)-4-acetyl-2,6-dimethylpiperazin-1-yl)-4-bromo-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 2, 180 mg, 0.35 mmol), 5-chloro-6-methyl-1-(tetrahydro-2H-pyran-2-yl)-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-indazole (Intermediate D1, 159 mg, 0.42 mmol), RuPhos (16.5 mg, 0.035 mmol) and RuPhos-Pd-G3 (29.5 mg, 0.035 mmol) in 1,4-dioxane (1.41 mL) were added K3PO4 (225 mg, 1.06 mmol) and water (353 μL). The reaction mixture was degassed and stirred at 90° C. for 1 h. The RM was quenched by addition of a sat. aq. NaHCO3 solution and extracted AcOEt (2×). The combined organic extracts were dried (Na2SO4), filtered and evaporated. The crude residue was diluted in THF (5 mL), SiliaMetS®Thiol (0.14 mmol) was added and the mixture was swirled at 40° C. for 1 h. The mixture was filtered, washed with THF and the filtrate was concentrated to dryness under reduced pressure. The residue was purified by normal phase chromatography (eluent: MeOH in CH2Cl2 from 0 to 5%) to give the title compound as a light yellow foam. UPLC-MS-2b: Rt=1.21 min; MS m/z [M+H]+ 680.3/682.3.
To a solution of tert-butyl 6-(3-((2R,6S)-4-acetyl-2,6-dimethylpiperazin-1-yl)-4-(5-chloro-6-methyl-1-(tetrahydro-2H-pyran-2-yl)-1H-indazol-4-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 3, 83 mg, 0.12 mmol) in CH2Cl2 (610 μL) was added TFA (282 μL, 3.66 mmol) and the reaction mixture was stirred at RT for 1 h. The reaction mixture was evaporated to dryness, then diluted with dioxane, frozen and lyophilized to give the title compound as a trifluoroacetate salt. UPLC-MS-2b: Rt=0.71 min; MS m/z [M+H]+ 496.2/498.2.
To a solution of 1-(6-(3-((2R,6S)-4-acetyl-2,6-dimethylpiperazin-1-yl)-4-(5-chloro-6-methyl-1H-indazol-4-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptan-2-yl)prop-2-en-1-one trifluoroacetate (Step 4, 0.12 mmol) in THF (4.8 mL) at 0° C. were added NaHCO3 (0.5M aq., 2.44 mL, 1.22 mmol) and a solution of acryloyl chloride (10.4 μL, 0.13 mmol) diluted in THF (100 L). The reaction mixture was stirred at 0° C. for 1 h, then was diluted with CH2Cl2 and quenched with a sat. aq. NaHCO3 solution. The layers were separated and the organic layer was dried (phase separator) and evaporated to dryness. The crude residue was purified by normal phase chromatography (eluent: MeOH in CH2Cl2 from 0 to 10%) to give the title compound. The isomers were separated by chiral SFC (C-SFC-2; mobile phase: CO2/IPA 68/32) to give after lyophilization (CH3CN/water) the title compound Example 13b as the second eluting peak (white solid): 1H NMR (600 MHz, DMSO-d6) δ 13.1 (s, 1H), 7.58 (s, 1H), 7.49 (s, 1H), 6.31 (m, 1H), 6.10 (m, 1H), 5.67 (m, 1H), 4.76 (m, 1H), 4.35 (s, 1H), 4.25 (s, 1H), 4.05 (s, 1H), 3.99 (m, 1H), 3.70 (m, 1H), 3.45 (m, 1H), 3.10-2.86 (m, 3H), 2.76-2.67 (m, 5H), 2.48 (s, 3H), 1.92-1.90 (m, 6H), 0.90-0.80 (m, 6H). UPLC-MS-2d: Rt=4.00 min; MS m/z [M+H]+ 550.2/552.3. C-SFC-3 (mobile phase: CO2/IPA 68/32): Rt=2.05 min. The other isomer Example 13a was obtained as the first eluting peak: C-SFC-3 (mobile phase: CO2/IPA 68/32): Rt=1.44 min.
Method-3a: similar to Method-3 except that Step 1 was performed using Phosphazene P2-Et in THF instead of NaOtBu in dioxane as described in Method-2 Step 1.
Method-3b: similar to Method-3 except that in Step 2 NIS was used instead of NBS to prepare the corresponding 4-iodo-pyrazole.
Method-3c: similar to Method-3 except that in Step 2 NIS in acetonitrile was used instead of NBS in THF to prepare the corresponding 4-iodo-pyrazole.
Method-3d: similar to Method-3 except that Step 4 was performed using H2SO4 in dioxane as described in Method-2 Step 3.
Method-3e: similar to Method-3 except that in Step 2 NIS, AIBN (0.1 eq) in acetonitrile was used instead of NBS in THF to prepare the corresponding 4-iodo-pyrazole.
Method-3f: similar to Method-3 except that in Step 2 acetonitrile was used instead of THF.
Method-3g: similar to Method-3 except that in Step 1 THF was used instead of dioxane.
Method-3h: similar to Method-3 except Step 5 was performed using acrylic acid and T3P in CH2Cl2 as described in Method-4 Step 5.
The following examples 14a to 53d were prepared using analogous methods to Method-3 from intermediates (in Step 1, 2, 3 or 4) described in the intermediates synthesis section or commercially available.
In Step 5, If observed the side product resulting from reaction of the acryloyl chloride with the indazole NH was hydrolyzed by addition of MeOH (0.5 mL) at 0-5° C. and stirring until disappearance (UPLC).
When the final separation of isomers is performed by preparative HPLC using acidic conditions the purified fractions were extracted with a sat. aq. NaHCO3 solution before lyophilization from CH3CN/H2O to give the title compound as a free base.
In an ace tube, tert-butyl 6-(3-bromo-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Intermediate C1, 2.12 g, 5.95 mmol), 8-(oxetan-3-yl)-5,8-diazaspiro[3.5]nonane trifluoroacetate salt (Intermediate A1, 1.88 g, 6.55 mmol), Pd(dba)2 (0.34 g, 0.59 mmol) and bis(3,5-bis(trifluoromethyl)phenyl)(2′,6′-bis(dimethylamino)-3,6-dimethoxybiphenyl-2-yl)phosphine (CAS: 1810068-30-4, 0.49 g, 0.65 mmol) were suspended in 1,4-dioxane (25 mL). NaOtBu (2M in THF, 7.44 mL, 14.9 mmol) was added, the vial was flushed with N2 and the reaction mixture was placed in a preheated oil bath at 85° C. and stirred for 40 min. Then the RM was poured into an aq. sat. NaHCO3 solution and extracted with CH2Cl2 (×3). The combined organic layers were dried (phase separator), concentrated under reduced pressure and the crude residue was purified by normal phase chromatography (eluent: MeOH in CH2Cl2 0 to 5%) to give the title compound as a brown foam. UPLC-MS-2a: Rt=0.95 min; MS m/z [M+H]+ 458.4.
To an ice-cooled solution of tert-butyl 6-(5-methyl-3-(8-(oxetan-3-yl)-5,8-diazaspiro[3.5]nonan-5-yl)-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 1, 650 mg, 1.33 mmol) in THF (13 mL) was added NIS (315 mg, 1.40 mmol) and the mixture was stirred under N2 atmosphere at 0° C. After completion (15 min), the reaction mixture was poured into 10% Na2S2O3 aq. solution and extracted with CH2Cl2 (×2). The combined organic layers were washed with a sat. aq. NaHCO3 solution, dried (phase separator) and concentrated to give the title product as a brown foam which was used without further purification in the next step. UPLC-MS-2a: Rt=1.11 min; MS m/z [M+H]+ 584.3.
To a mixture of tert-butyl 6-(4-iodo-5-methyl-3-(8-(oxetan-3-yl)-5,8-diazaspiro[3.5]nonan-5-yl)-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 2, 835 mg, 1.33 mmol), 5-chloro-6-methyl-1-(tetrahydro-2H-pyran-2-yl)-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-indazole (Intermediate D1, 652 mg, 1.73 mmol), RuPhos (62.1 mg, 0.13 mmol) and RuPhos-Pd-G3 (111 mg, 0.13 mmol) in dioxane (5.30 mL) was added K3PO4 (2 M in water, 2.00 mL, 4.00 mmol) and the reaction mixture was stirred at 90° C. for 1 h under a nitrogen atmosphere. The reaction mixture was poured into a sat. aq. NaHCO3 solution and extracted with CH2Cl2 (×3). The combined organic extracts were dried (phase separator) and concentrated. The crude residue was diluted with THF (5 mL), SiliaMetS®Thiol (0.53 mmol) was added and the mixture swirled for 1 h at 40° C. The mixture was filtered, the filtrate was concentrated and the crude residue was purified by normal phase chromatography (eluent: EtOAc in c-hexane 0 to 100%) to give the title compound as a beige foam. UPLC-MS-2a: Rt=1.19 min; MS m/z [M+H]+ 706.5/708.4.
To a solution of tert-butyl 6-(4-(5-chloro-6-methyl-1-(tetrahydro-2H-pyran-2-yl)-1H-indazol-4-yl)-5-methyl-3-(8-(oxetan-3-yl)-5,8-diazaspiro[3.5]nonan-5-yl)-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 3, 825 mg, 1.17 mmol) in CH2Cl2 (3.8 mL) was added TFA (2.70 mL, 35.0 mmol) and the solution was stirred at RT for 2.5 h. The RM was concentrated, co-evaporated with CH2Cl2 (×2) and dried under high vacuum overnight to give the title compound as a trifluoroacetate salt which was used in the next step without further purification. UPLC-MS-2a: Rt=0.65 min; MS m/z [M+H]+ 522.3/524.3.
A mixture of acrylic acid (0.12 mL, 1.75 mmol), propylphosphonic anhydride (50% in EtOAc, 1.17 mL, 1.26 mmol) and DIPEA (3.99 mL, 23.3 mmol) in CH2Cl2 (18 mL) was stirred for 20 min and then added under a nitrogen atmosphere to a solution of 5-(4-(5-chloro-6-methyl-1H-indazol-4-yl)-5-methyl-1-(2-azaspiro[3.3]heptan-6-yl)-1H-pyrazol-3-yl)-8-(oxetan-3-yl)-5,8-diazaspiro[3.5]nonane trifluoroacetate (Step 4, 1.16 mmol) in CH2Cl2 (9 mL). The reaction mixture was stirred at RT for 20 min. After completion of the reaction, LiOH (2M, 2.91 mL, 5.82 mmol) was added and the mixture was vigorously stirred at RT for 30 min to remove the side product resulting from reaction of the acryloyl chloride with the indazole NH. The reaction mixture was poured into a sat. aq. NaHCO3 solution and extracted with CH2Cl2 (×2). The combined organic extracts were concentrated, dried (phase separator) and the crude residue was purified by normal phase chromatography (eluent: MeOH in CH2Cl2 0 to 6%) to give the title compound as a light yellow foam. The isomers were separated by chiral SFC (C-SFC-1; mobile phase: CO2/[IPA+0.1% Et3N] 72/28) to give after lyophilization (CH3CN/water) the title compound Example 54b as the second eluting peak (white solid): 1H NMR (600 MHz, DMSO-d6) δ 13.0 (s, 1H), 7.57 (s, 1H), 7.44 (s, 1H), 6.31 (m, 1H), 6.10 (m, 1H), 5.68 (m, 1H), 4.74 (m, 1H), 4.47 (d, 1H), 4.46 (d, 1H), 4.38-4.33 (m, 3H), 4.29 (m, 1H), 4.06 (s, 1H), 4.00 (m, 1H), 3.27 (m, 1H), 2.80-2.66 (m, 6H), 2.47 (s, 3H), 2.30-2.21 (m, 2H), 2.18-2.08 (m, 2H), 1.99 (s, 3H), 1.98 (m, 1H), 1.90 (m, 1H), 1.83 (m, 1H), 1.65-1.56 (m, 3H). UPLC-MS-2e: Rt=3.49 min; MS m/z [M+H]+ 576.4/578.4. C-SFC-3 (mobile phase: CO2/[IPA+0.025% NH3]: 72/28): Rt=2.60 min. The other isomer Example 54a was obtained as the first eluting peak: C-SFC-3 (mobile phase: CO2/[IPA+0.025% NH3]: 72/28): Rt=1.76 min.
Method-4a: similar to Method-4 except that in Step 2, NBS was used instead of NIS to prepare the corresponding 4-bromo-pyrazole.
Method-4b: similar to Method-4 except that in Step 2, NBS in acetonitrile was used instead of NIS in THF to prepare the corresponding 4-bromo-pyrazole.
Method-4c: similar to Method-4 except that in Step 1, 2-[bis(3,5-trifluoromethylphenylphosphino)-3,6-dimethoxy]-2′,6′-di-i-propoxy-1,1′-biphenyl (CAS: 1810068-31-5) was used as a ligand instead of bis(3,5-bis(trifluoromethyl)phenyl)(2′,6′-bis(dimethylamino)-3,6-dimethoxybiphenyl-2-yl)phosphine (CAS: 1810068-30-4).
Method-4d: similar to Method-4 except Step 5 was performed using HBTU in acetonitrile instead of propylphosphonic anhydride in CH2Cl2.
Method-5e: similar to Method-4 except Step 5 was performed using acryloyl chloride and NaHCO3 as described in Method-8 Step 3.
Method-5f: similar to Method-4 except that in Step 2, acetonitrile was used instead of THF.
Method-5q: similar to Method-4 except that in Step 2 NIS, AIBN (0.1 eq) in acetonitrile was used instead of NIS in THF.
Method-4h: similar to Method-4 except that in Step 3 toluene was used as a solvent instead of dioxane.
Method-4i: similar to Method-4 except that in Step 1 toluene was used as a solvent instead of dioxane.
Method-4j: similar to Method-4 except that in Step 3 EtOH water was used as a solvent instead of dioxane.
Method-4k: similar to Method-4 except that in Step 2, DMF was used instead of THF.
The following examples 55a to 120b were prepared using analogous methods to Method-4 from intermediates (in Step 1, 2 or 3) described in the intermediates synthesis section or commercially available. When the final separation of isomers is performed by preparative HPLC using acidic conditions the purified fractions were extracted with a sat. aq. NaHCO3 solution before lyophilization from a mixture of CH3CN/H2O to give the title compound as a free base.
To a solution of acetic acid (0.035 mL, 0.61 mmol) in DMF (4 mL) was added at room temperature DIPEA (0.22 mL, 1.23 mmol) followed by a solution of HATU (466 mg, 1.23 mmol) in DMF (4 mL). After 5 min at RT, a solution of (S)-1-(6-(4-(5-chloro-6-methyl-1H-indazol-4-yl)-3-(2-ethyl-2-methylpiperazin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptan-2-yl)prop-2-en-1-one (Intermediate C39, 400 mg, 0.61 mmol) in DMF (4 mL) was added and the reaction mixture was stirred at RT for 30 min. CH2Cl2 (30 mL) and K2CO3 (10% in water, 10 mL) were added, the layers were separated and the aqueous layer was extracted with CH2Cl2. The combined organic extracts were washed with brine, dried (MgSO4), filtered and evaporated. The crude residue was purified by normal phase chromatography (eluent: EtOAc in heptane 0 to 50%). UPLC-MS-2a: Rt=1.27 min; MS m/z [M+H]+ 694.5/696.7.
To a solution of tert-butyl 6-(3-((S)-4-acetyl-2-ethyl-2-methylpiperazin-1-yl)-4-(5-chloro-6-methyl-1-(tetrahydro-2H-pyran-2-yl)-1H-indazol-4-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 1, 420 mg, 0.61 mmol) in CH2Cl2 (2 mL) was added TFA (1.40 mL, 18.1 mmol). The reaction mixture was stirred at RT for 2 h, then was evaporated to dryness to give the title compound as a trifluoroacetate salt which was used in the next step without purification. UPLC-MS-2a: Rt=0.79 min; MS m/z [M+H]+ 510.3/512.3.
To a stirred solution of (S)-1-(4-(4-(5-chloro-6-methyl-1H-indazol-4-yl)-5-methyl-1-(2-azaspiro[3.3]heptan-6-yl)-1H-pyrazol-3-yl)-3-ethyl-3-methylpiperazin-1-yl)ethan-1-one trifluoroacetate (Step 2, 0.59 mmol) in CH2Cl2 (3 mL) was added at 0° C. under Argon atmosphere a solution of acrylic acid (0.12 mL, 1.76 mmol), T3P (50% in EtOAc, 1.05 mL, 1.76 mmol) and DIPEA (2.56 mL, 14.65 mmol) in CH2Cl2 (3 mL). The reaction mixture was stirred for 30 min at 0° C. Then, the RM was quenched by addition of a sat. aq. solution of NaHCO3 (50 mL) and extracted with CH2Cl2 (2×100 mL). The combined organic extracts were washed with a sat. aq. solution of NaHCO3, brine, dried (MgSO4), filtered and evaporated. The crude residue was diluted in THF (20 mL) and LiOH (2 M, 2.93 mL, 5.86 mmol) was added. The mixture was stirred at RT for 30 min, then extracted with CH2Cl2, washed with brine, dried (MgSO4), filtered and evaporated. The crude residue was purified by normal phase chromatography (eluent: MeOH/CH2Cl2 10/90 in CH2Cl2 from 0 to 100%) to give the title compound. The isomers were separated by chiral SFC (C-SFC-1; mobile phase: CO2/[IPA+0.1% Et3N] 65/35) to give the title compound Example 121b as the second eluting peak: 1H NMR (600 MHz, DMSO-d6) δ 13.0 (br. s, 1H), 7.59 (m, 1H), 7.47 (s, 1H), 6.30 (m, 1H), 6.09 (m, 1H), 5.67 (m, 1H), 4.75 (m, 1H), 4.33 (s, 1H), 4.28 (s, 1H), 4.05 (s, 1H), 3.99 (s, 1H), 3.47-3.15 (m, 3H, overlapping with DMSO peak), 3.08 (m, 1H), 2.93-2.81 (m, 2H), 2.76-2.63 (m, 4H), 2.48 (s, 3H), 1.98 (s, 3H), 1.94 (s, 1.5H), 1.91 (s, 1.5H), 1.70-1.56 (m, 1H), 1.49-1.34 (m, 1H), 0.83-080 (m, 3H), 0.60-0.52 (m, 3H); UPLC-MS-2a: Rt=0.97 min; MS m/z [M+H]+ 564.3/566.3; C-SFC-3 (mobile phase: CO2/[EtOH+0.1% Et3N]: 65/35): Rt=2.51 min. The other isomer Example 121a was obtained as the first eluting peak: C-SFC-3 (mobile phase: CO2/[EtOH+0.1% Et3N]: 65/35): Rt=1.00 min.
Method-5a: similar to Method-5 except that Step d was performed using RCOCl and Et3N in CH2Cl2 instead of RCOOH, HATU, DIPEA in DMF.
Method-5b: similar to Method-5 except Step 3 was performed using acryloyl chloride and NaHCO3 followed by a treatment with LiOH as described in Method-8 Step 3.
Method-5c: similar to Method-5 except that Step 1 was performed using RCOOH, T3P and DIPEA in CH2Cl2 as described in Step 3 instead of RCOOH, HATU, DIPEA in DMF.
The following examples 122a to 129b were prepared using analogous methods to Method-5 from intermediates (in Step 1) described in the intermediates synthesis section or commercially available. When the final separation of isomers is performed by preparative HPLC using acidic conditions the purified fractions were extracted with a sat. aq. NaHCO3 solution before lyophilization from a mixture of CH3CN/H2O to give the title compound as a free base.
1-(6-(4-(5-chloro-6-methyl- 1H-indazol-4-yl)-3-(8-(2-
(S)-1-(6-(4-(5-chloro-6-
To a stirred solution of tert-butyl 6-(4-(5-chloro-6-methyl-1-(tetrahydro-2H-pyran-2-yl)-1H-indazol-4-yl)-5-methyl-3-(5,8-diazaspiro[3.5]nonan-5-yl)-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (intermediate C28, 400 mg, 0.62 mmol) in dichloroethane (3 mL) were added under argon atmosphere tetrahydro-4H-pyran-4-one (123 mg, 1.23 mmol) and NaBH(OAc)3 (391 mg, 1.85 mmol). The reaction mixture was stirred for 16 h at RT. The reaction mixture was quenched by addition of a sat. aq. NaHCO3 solution and extracted CH2Cl2 (2×). The combined organic layers were washed with a sat. aq. NaHCO3 solution, dried (Na2SO4) and evaporated. The crude residue was purified by normal phase chromatography (eluent: MeOH in CH2Cl2 from 0 to 10%). UPLC-MS-2a: Rt=1.06 min; MS m/z [M+H]+ 734.7/736.5.
To a stirred solution of tert-butyl 6-(4-(5-chloro-6-methyl-1-(tetrahydro-2H-pyran-2-yl)-1H-indazol-4-yl)-5-methyl-3-(8-(tetrahydro-2H-pyran-4-yl)-5,8-diazaspiro[3.5]nonan-5-yl)-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 1, 448 mg, 0.61 mmol) in CH2Cl2 (4 mL) was added TFA (1.41 mL, 18.3 mmol) and the reaction mixture was stirred for 16 h at RT. The RM was concentrated to give the title compound as a trifluoroacetate salt, which was used in the next step without purification. UPLC-MS-2a: Rt=0.64 min; MS m/z [M+H]+ 550.3/552.3.
To a stirred solution of 5-(4-(5-chloro-6-methyl-1H-indazol-4-yl)-5-methyl-1-(2-azaspiro[3.3]heptan-6-yl)-1H-pyrazol-3-yl)-8-(tetrahydro-2H-pyran-4-yl)-5,8-diazaspiro[3.5]nonane trifluoroacteate (Step 2, 0.61 mmol) in CH2Cl2 (4 mL) was added under argon atmosphere a solution of acrylic acid (0.13 mL, 1.83 mmol), T3P (50% in EtOAc, 1.09 mL, 1.83 mmol) and DIEA (2.67 mL, 15.3 mmol) at 0° C. and the reaction mixture was stirred for 30 min at 0° C. The RM was quenched by addition of a sat. aq. NaHCO3 solution, then extracted with CH2Cl2 (2×). The combined organic extracts were washed with a sat. aq. NaHCO3 solution, dried (Na2SO4) and evaporated. The crude residue was purified by normal phase chromatography (eluent: MeOH in CH2Cl2 from 0 to 10%) to give the title compound. The isomers were separated by chiral SFC (C-SFC-1; mobile phase: CO2/[IPA+0.1% Et3N] 70/30) to give the title compound Example 130b as the second eluting peak (white powder): 1H NMR (400 MHz, DMSO-d6) δ 12.95 (s, 1H), 7.57 (s, 1H), 7.44 (s, 1H), 6.31 (m, 1H), 6.10 (m, 1H), 5.67 (m, 1H), 4.75 (m, 1H), 4.34 (s, 1H), 4.29 (s, 1H), 4.06 (s, 1H), 4.00 (s, 1H), 3.81 (m, 2H), 3.21 (t, 2H), 2.79-2.63 (m, 6H), 2.47 (s, 3H), 2.44 (m, 1H), 2.36 (m, 1H), 2.25 (m, 2H), 2.16 (m, 3H), 1.99 (s, 3H), 1.76 (m, 1H), 1.62-1.52 (m, 5H), 1.38-1.26 (m, 2H); UPLC-MS-2a: Rt=0.79 min; MS m/z [M+H]+ 604.3/606.3; C-SFC-3 (mobile phase: CO2/[IPA+0.1% Et3N] 70/30): Rt=2.70 min. The other isomer Example 130a was obtained as the first eluting peak: C-SFC-3 (mobile phase: CO2/[IPA+0.1% Et3N]70/30): Rt=1.65 min.
Method-6a: similar to Method-6 except that Step 3 was performed using acryloyl chloride and NaHCO3 as described in Method-8 Step 3.
The following examples 131a to 159b were prepared using analogous methods to Method-6 from intermediates (in Step 1) described in the intermediates synthesis section or commercially available.
In Step 3, If observed the side product resulting from reaction of the acryloyl chloride with the indazole NH was hydrolyzed by treatment with LiOH as described in Method-5 or in Method-12.
When the final separation of isomers is performed by preparative HPLC using acidic conditions the purified fractions were extracted with a sat. aq. NaHCO3 solution before lyophilization from a mixture of CH3CN/H2O to give the title compound as a free base.
1-(6-(4-(5-chloro-6- methyl-1H-indazol-4-yl)-
1-(6-(4-(5-chloro-6- methyl-1H-indazol-4-yl)-5-methyl-3-(8- (tetrahydrofuran-3-yl)-5,8- diazaspiro[3.5]nonan-5-yl)-1H-pyrazol-1-yl)-2- azaspiro[3.3]heptan-2-yl)prop-2-en-1-one
(S)-1-(6-(4-(5-chloro-6-
1-(6-(4-(5-chloro-6- methyl-1H-indazol-4-yl)-
1-(6-(3-(8-(2-oxaspiro[3.3]heptan-6- yl)-5,8-diazaspiro[3.5]nonan-5-
1-(6-(4-(5-chloro-6- methyl-1H-indazol-4-yl)- 5-methyl-3-((4aS*,7aS*)-
1-(6-(4-(5-chloro-6-
(R)-1-(6-(4-(5-chloro-6- methyl-1H-indazol-4-yl)- 3-(2-ethyl-2-methyl-4-
(S)-1-(6-(4-(5-chloro-6- methyl-1H-indazol-4-yl)-3-(2-(difluoromethyl)-2- methyl-4-(tetrahydro-2H-pyran-4-yl)piperazin-1- yl)-5-methyl-1H-pyrazol-1-yl)-2- azaspiro[3.3]heptan-2-yl)prop-2-en-1-one
(R)-1-(6-(4-(5-chloro-6- methyl-1H-indazol-4-yl)-
(R)-1-(6-(4-(5-chloro-6- methyl-1H-indazol-4-yl)- 3-(2-(methoxymethyl)-2-
(R)-1-(6-(4-(5,6-dichloro- 1H-indazol-4-yl)-3-(2- (methoxymethyl)-2-
(R)-1-(6-(4-(5-chloro-6- methyl-1H-indazol-4-yl)- 3-(2-(difluoromethyl)-2- methyl-4-(tetrahydro-2H-
(R)-1-(6-(4-(5-chloro-6-
1-(6-(4-(5-chloro-6-
(S)-1-(6-(4-(5-chloro-6- methyl-1H-indazol-4-yl)- 3-(2-(difluoromethyl)-2- ethyl-4-(tetrahydro-2H-
1-(6-(4-(5-chloro-6- methyl-1H-indazol-4-yl)- 3-((2S)-2-ethyl-2-methyl- 4-(tetrahydro-2H-pyran- 3-yl)piperazin-1-yl)-5- methyl-1H-pyrazol-1-yl)- 2-azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
To a solution of tert-butyl 6-(4-(5-chloro-6-methyl-1-(tetrahydro-2H-pyran-2-yl)-1H-indazol-4-yl)-5-methyl-3-(5,8-diazaspiro[3.5]nonan-5-yl)-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Intermediate C28, 11.8 g, 18.2 mmol) in DMF (90 mL) under an argon atmosphere was added portionwise while cooling LiClO4 (19.4 g, 182 mmol) (exothermic) followed by 2,2-dimethyloxirane (32.5 mL, 364 mmol). The reaction mixture was stirred 2 h at 70° C. The RM was cooled to RT, poured into a sat. aq. solution of NaHCO3 and extracted with CH2Cl2 (×3). The combined organic extracts were washed with brine, dried (MgSO4) and concentrated. The crude residue was purified by normal chromatography (eluent: hexane/(CH2Cl2/MeOH 9/1) in hexane 1/9 to 1/1) to give the title compound as a beige foam. UPLC-MS-3: Rt=1.10 min; MS m/z [M+H]+ 722.6/724.6.
To a solution of tert-butyl 6-(4-(5-chloro-6-methyl-1-(tetrahydro-2H-pyran-2-yl)-1H-indazol-4-yl)-3-(8-(2-hydroxy-2-methylpropyl)-5,8-diazaspiro[3.5]nonan-5-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 1, 11.7 g, 16.2 mmol) in CH2Cl2 (70 mL) was added TFA (37.4 mL, 486 mmol). The resulting solution was stirred for 2 h at RT. The reaction mixture was concentrated and dried overnight under high vacuum to give the title compound as a trifluoroacetate salt which was used without purification in the next step. UPLC-MS-3: Rt=0.41 min; MS m/z [M+H]+ 538.5/540.5.
To a solution of acrylic acid (1.38 mL, 20.0 mmol) and T3P (50% in EtOAc, 11.9 mL, 20.0 mmol) in CH2Cl2 (38 mL) under argon atmosphere was added DIPEA (17.5 mL, 100 mmol) at 5° C. The cooling bath was removed and the resulting solution was stirred for 10 min, then was added dropwise (over 30 min) to a cooled solution (5° C.) of 1-(5-(4-(5-chloro-6-methyl-1H-indazol-4-yl)-5-methyl-1-(2-azaspiro[3.3]heptan-6-yl)-1H-pyrazol-3-yl)-5,8-diazaspiro[3.5]nonan-8-yl)-2-methylpropan-2-ol (Step 2, 10.0 mmol) in CH2Cl2 (38 mL). The reaction mixture was allowed to reach 15° C. and was stirred for 20 min. The RM was cooled to 5° C., THF (10 mL) and LiOH (2M, 75 mL, 150 mmol) were added. The RM was stirred for 30 min at RT, then was poured into a sat. aq. NaHCO3 solution and extracted with CH2Cl2 (3×). The combined organic extracts were washed with a sat. aq. NaHCO3 solution, dried (MgSO4) and concentrated. The crude residue was purified by normal phase chromatography (eluent: (EtOAc/MeOH 9/1) in hexane from 10 to 100%) to give the title product. The isomers were separated by chiral SFC (C-SFC-4; mobile phase: CO2/IPA 65/35) to give the second eluting peak which was further purified by normal phase chromatography (eluent: (CH2Cl2/MeOH 9/1) in hexane from 0 to 100%) to give the title compound Example 160b (white powder): 1H NMR (600 MHz, DMSO-d6) δ 12.9 (s, 1H), 7.56 (d, 1H), 7.44 (s, 1H), 6.31 (m, 1H), 6.10 (m, 1H), 5.67 (m, 1H), 4.75 (m, 1H), 4.34 (s, 1H), 4.29 (s, 1H), 4.06 (s, 1H), 4.00 (s, 1H), 2.82-2.65 (m, 6H), 2.51 (m, 2H, overlapping with DMSO peak), 2.48 (s, 3H), 2.37 (m, 1H), 2.25-2.11 (m, 4H), 2.06 (d, 2H), 1.99 (s, 3H), 1.81 (m, 1H), 1.62-1.48 (m, 3H), 1.06 (s, 6H); UPLC-MS-3: Rt=0.68 min; MS m/z [M+H]+ 592.5/594.5; C-SFC-3 (mobile phase: CO2/[IPA+0.1% Et3N]: 70/30): Rt=2.71 min. The other isomer Example 160a was obtained as the first eluting peak: C-SFC-3 (mobile phase: CO2/[IPA+0.1% Et3N]: 70/30): Rt=1.69 min.
The following examples 161a to 168 were prepared using analogous methods to Method-7 from intermediates (in Step 1) described in the intermediates synthesis section or commercially available.
When the final separation of isomers is performed by preparative HPLC using acidic conditions the purified fractions were extracted with a sat. aq. NaHCO3 solution before lyophilization from CH3CN/H2O to give the title compound as a free base.
To tert-butyl 6-(4-(5-chloro-6-methyl-1-(tetrahydro-2H-pyran-2-yl)-1H-indazol-4-yl)-5-methyl-3-(5,8-diazaspiro[3.5]nonan-5-yl)-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (intermediate C28, 0.51 mmol, 350 mg) in DMF (3 mL) was added under argon a solution of (S)-(1,4-dioxan-2-yl)methyl 4-methylbenzenesulfonate (Intermediate B1, 184 mg, 0.61 mmol) and triethylamine (0.21 mL, 1.52 mmol). The reaction mixture was stirred at 60° C. for 11 h. The reaction mixture was diluted with a sat. aq. NaHCO3 solution, extracted with EtOAc and the combined organic extracts were washed with brine, dried (Na2SO4), filtered and evaporated. The crude residue was purified by normal phase chromatography (eluent: EtOAc in n-heptane 0 to 100%). UPLC-MS-3: Rt=1.10 min; MS m/z [M+H]+ 750.5/752.5.
To a solution of tert-butyl 6-(3-(8-(((R)-1,4-dioxan-2-yl)methyl)-5,8-diazaspiro[3.5]nonan-5-yl)-4-(5-chloro-6-methyl-1-(tetrahydro-2H-pyran-2-yl)-1H-indazol-4-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 1, 320 mg, 0.39 mmol) in CH2Cl2 (8 mL) was added under argon TFA (0.60 mL, 7.79 mmol) and the reaction mixture was stirred at RT for 2 days. TFA (0.30 mL, 3.89 mmol) was added again and the reaction mixture was stirred for another 24 h to complete the reaction. The reaction mixture was evaporated to dryness to give the title compound as a trifluoroacetate salt which was used without purification in the next step. UPLC-MS-3: Rt=0.45 min; MS m/z [M+H]+ 566.5/568.5.
To a solution of (R)-8-((1,4-dioxan-2-yl)methyl)-5-(4-(5-chloro-6-methyl-1H-indazol-4-yl)-5-methyl-1-(2-azaspiro[3.3]heptan-6-yl)-1H-pyrazol-3-yl)-5,8-diazaspiro[3.5]nonane (Step 2, 0.40 mmol) in THF (8 mL) under argon were added water (0.21 mL) and NaHCO3 (670 mg, 7.97 mmol) followed by acryloyl chloride (0.04 mL, 0.48 mmol). The reaction mixture was stirred at RT for 30 min. Acryloyl chloride (0.01 mL, 0.12 mmol) was added again and the RM was stirred for 30 min to complete the reaction. Then, LiOH (2 M, 2 mL, 4 mmol) was added and the RM was stirred at RT for 30 min until disappearance (UPLC) of the side product resulting from reaction of the acryloyl chloride with the indazole NH. The RM was diluted with water, extracted with EtOAc (×2) and the combined organic extracts were washed with brine, dried (Na2SO4), filtered and evaporated. The crude residue was purified by preparative HPLC (RP-HPLC-1; mobile phase: A: water+0.1% TFA, B: acetonitrile; gradient: 10 to 95% B in 25 min), the purified fractions were neutralized by addition of a sat. aq. NaHCO3 solution and extracted with EtOAc (×2) to give after evaporation under reduced pressure the title compound. The isomers were separated by chiral SFC (C-SFC-4; mobile phase: CO2/[IPA+0.1% Et3N] 70/30) to give the title compound as the second eluting peak Example 169b (white powder): 1H NMR (600 MHz, DMSO-d6) δ 12.9 (s, 1H), 7.56 (d, 1H), 7.43 (s, 1H), 6.31 (m, 1H), 6.10 (m, 1H), 5.67 (m, 1H), 4.74 (m, 1H), 4.33 (s, 1H), 4.28 (m, 1H), 4.05 (s, 1H), 3.99 (m, 1H), 3.70-3.63 (m, 2H), 3.61-3.56 (m, 2H), 3.51 (td, 1H), 3.39 (td, 1H), 3.16 (m, 1H), 2.80-2.62 (m, 6H), 2.47 (s, 3H), 2.34 (m, 1H), 2.26-2.07 (m, 6H), 2.02 (m, 1H), 1.98 (s, 3H), 1.76 (m, 1H), 1.62-1.52 (m, 3H); UPLC-MS-3: Rt=0.68 min; MS m/z [M+H]+ 620.4/622.5; C-SFC-3 (mobile phase: CO2/[IPA+0.1% Et3N]: 70/30): Rt=2.51 min. The other isomer Example 169a was obtained as the first eluting peak: C-SFC-3 (mobile phase: CO2/[IPA+0.1% Et3N]: 70/30): Rt=1.34 min.
Method-8a: similar to Method-8 except that Step 1 was performed in CH3CN at 80° C. instead of DMF at 60° C.
Method-8b: similar to Method-8 except that Step 3 was performed using Et3N, acrylic acid or a substituted acrylic acid and T3P in CH2Cl2 as described in Step 3 in Method-7.
Method-8c: similar to Method-8 except that NaI (1 eq.) was added in Step 1.
Method-8d: similar to Method-8 except that Step 1 was performed in CH3CN at 80° instead of DMF at 60° C. and that NaI (1 eq.) was added.
The following examples 170a to 189b were prepared using analogous methods to Method-8 from intermediates (in Step 1, 2 or 3) described in the intermediates synthesis section or commercially available.
When the final separation of isomers is performed by preparative HPLC using acidic conditions the purified fractions were extracted with a sat. aq. NaHCO3 solution before lyophilization from a mixture of CH3CN and H2O to give the title compound as a free base.
1-(6-(4-(5-chloro-6-methyl- 1H-indazol-4-yl)-3-(4-(2- methoxyethyl)-2,2- dimethylpiperazin-1-yl)-5- methyl-1H-pyrazol-1-yl)-2-
(R)-1-(6-(3-(8-((1,4-dioxan- 2-yl)methyl)-5,8- diazaspiro[3.5]nonan-5-yl)- 4-(5,6-dichloro-1H-indazol-
(R)-1-(6-(3-(4-((1,4-dioxan- 2-yl)methyl)-2,2- dimethylpiperazin-1-yl)-4-
1-(6-(3-((S)-4-(((R)-1,4- dioxan-2-yl)methyl)-2-ethyl- 2-methylpiperazin-1-yl)-4-(5-chloro-6-methyl-1H- indazol-4-yl)-5-methyl-1H-pyrazol-1-yl)-2- azaspiro[3.3]heptan-2-yl)prop-2-en-1-one
1-(6-(3-((S)-4-(((R)-1,4-dioxan-2-yl)methyl)-2-ethyl- 2-methylpiperazin-1-yl)-4-(5-chloro-6-methyl-1H- indazol-4-yl)-5-methyl-1H-pyrazol-1-yl)-2- azaspiro[3.3]heptan-2-yl)-2- fluoroprop-2-en-1-one
(E)-1-(6-(3-((S)-4-(((R)-1,4- dioxan-2-yl)methyl)-2-ethyl- 2-methylpiperazin-1-yl)-4-
(S)-4-(2-(4-(1-(2-acryloyl-2-azaspiro[3.3]heptan-6-yl)-4- (5-chloro-6-methyl-1H-indazol-4-yl)-5-methyl-1H- pyrazol-3-yl)-3-ethyl-3-methylpiperazin-1- yl)ethyl)morpholin-3-one
(R)-1-(6-(4-(5-chloro-6-methyl-1H-indazol-4-yl)-3- (2-(difluoromethyl)-4-(2-methoxyethyl)-2- methylpiperazin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2- azaspiro[3.3]heptan-2-yl)prop-2-en-1-one
(S)-1-(6-(4-(5-chloro-6- methyl-1H-indazol-4-yl)-3- (2-(difluoromethyl)-4-(2- methoxyethyl)-2- methylpiperazin-1-yl)-5- methyl-1H-pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
methyl 2-(5-(1-(2-acryloyl-2-azaspiro[3.3]heptan-6-yl)-4- (5-chloro-6-methyl-1H-indazol-4-yl)-5-methyl-1H- pyrazol-3-yl)-5,8-diazaspiro[3.5]nonan-8-yl)- 2-methylpropanoate
1-(6-(3-((R)-4-(((R)-1,4- dioxan-2-yl)methyl)-2- (methoxymethyl)-2-
1-(6-(3-((R)-4-(((R)-1,4-dioxan-2-yl)methyl)-2- (methoxymethyl)-2-methylpiperazin-1-yl)-4- (5,6-dichloro-1H-indazol-4-yl)-5-methyl-1H-pyrazol-1- yl)-2-azaspiro[3.3]heptan-2-yl)prop-2-en-1-one
(S)-1-(6-(3-(4-((1,4-dioxepan-6-yl)methyl)-2- ethyl-2-methylpiperazin-1-yl)-4-(5-chloro-6-methyl-1H- indazol-4-yl)-5-methyl-1H-pyrazol-1-yl)-2- azaspiro[3.3]heptan-2-yl)prop-2-en-1-one
To a suspension of tert-butyl 6-(4-(5-chloro-6-methyl-1-(tetrahydro-2H-pyran-2-yl)-1H-indazol-4-yl)-5-methyl-3-(5,8-diazaspiro[3.5]nonan-5-yl)-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (intermediate C28, 1.52 mmol, 1.00 g) and Cs2CO3 (1.49 g, 4.57 mmol) in DMF (10 mL) was added under nitrogen atmosphere methyl alpha-dromoisobutyrate (0.30 mL, 2.30 mmol) and the reaction mixture was stirred at 80° C. for 2 h. Methyl 2-bromo-2-methylpropanoate (0.15 mL, 1.15 mmol) was added again and the RM was further stirred for 1 h at 80° C. (this operation was repeated 3 times) until completion of the reaction. The RM was poured into a sat. aq. NaHCO3 solution and extracted with EtOAc (×2). The combined organic extracts were washed with brine, dried (Na2SO4), filtered and concentrated. The crude residue was purified by normal phase chromatography (eluent: EtOAc in n-heptane 0 to 50%) to give the title compound. UPLC-MS-4: Rt=1.44 min; MS m/z [M+H]+ 750.5/752.5.
To a solution of tert-butyl 6-(4-(5-chloro-6-methyl-1-(tetrahydro-2H-pyran-2-yl)-1H-indazol-4-yl)-3-(8-(1-methoxy-2-methyl-1-oxopropan-2-yl)-5,8-diazaspiro[3.5]nonan-5-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 1, 280 mg, 0.37 mmol) in THF (0.50 mL) was added LiBH4 (2 M in THF, 0.56 mL, 1.12 mmol) and the reaction mixture was stirred at 60° C. for 15 h. LiBH4 (2 M in THF, 0.56 mL, 1.12 mmol) was added again and the RM further stirred 7 h at 60° C. The RM was carefully poured into an aq. sat. NaHCO3 solution and extracted with CH2Cl2 (×3). The combined organic extracts were dried (phase separator) and concentrated in vacuo. The crude residue was purified by normal phase chromatography (eluent: MeOH in CH2Cl2 0 to 8%) to give the title compound as a white foam. UPLC-MS-4: Rt=1.13 and 1.15 min; MS m/z [M+H]+ 722.5/724.5.
To a solution of tert-butyl 6-(4-(5-chloro-6-methyl-1-(tetrahydro-2H-pyran-2-yl)-1H-indazol-4-yl)-3-(8-(1-hydroxy-2-methylpropan-2-yl)-5,8-diazaspiro[3.5]nonan-5-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 2, 220 mg, 0.31 mmol) in CH2Cl2 (1 mL) was added TFA (0.71 mL, 9.14 mmol) and the reaction mixture was stirred at RT for 1.5 h. The reaction mixture was evaporated to dryness to give the title compound as a trifluoroacetate salt which was used without purification in the next step. UPLC-MS-4: Rt=0.47 min; MS m/z [M+H]+ 538.3/540.2.
A solution of acrylic acid (0.045 mL, 0.65 mmol), propylphosphonic anhydride (50% in EtOAc, 385 μL, 0.65 mmol) and DIPEA (0.76 mL, 4.46 mmol) in CH2Cl2 (3.90 mL) was stirred at RT for 20 min. This solution was then added to an ice-cooled solution of 2-(5-(4-(5-chloro-6-methyl-1H-indazol-4-yl)-5-methyl-1-(2-azaspiro[3.3]heptan-6-yl)-1H-pyrazol-3-yl)-5,8-diazaspiro[3.5]nonan-8-yl)-2-methylpropan-1-ol (Step 3, 0.30 mmol) in CH2Cl2 (1.90 mL) and the reaction mixture was stirred at RT for 15 min. The RM was poured into a sat. aq. NaHCO3 solution and extracted with CH2Cl2 (×3). The combined organic extracts were dried (phase separator) and concentrated in vacuo. This material was dissolved in THF (2.90 mL), LiOH (2 N aqueous, 1.49 mL, 2.97 mmol) was added and the mixture was stirred at RT for 1 h. The RM was poured into a sat. aq. NaHCO3 solution and extracted with CH2Cl2 (×3), the combined organic layers were dried (phase separator) and concentrated in vacuo. The crude residue was purified by normal phase chromatography (eluent: MeOH in CH2Cl2 0 to 15%) to give the title compound. The isomers were separated by chiral SFC (C-SFC-4; mobile phase: CO2/[IPA+0.1% Et3N]: 70/30) to give the title compound Example 190b as the second eluting peak: 1H NMR (600 MHz, DMSO-d6) δ 12.9 (s, 1H), 7.56 (s, 1H), 7.43 (s, 1H), 6.30 (m, 1H), 6.10 (m, 1H), 5.67 (m, 1H), 4.75 (m, 1H), 4.34 (s, 1H), 4.28 (s, 1H), 4.09-4.05 (m, 2H), 4.00 (m, 1H), 3.19 (s, 2H), 2.81-2.63 (m, 6H), 2.47 (s, 3H), 2.47-2.34 (m, 2H), 2.30-2.11 (m, 4H), 1.99 (s, 3H), 1.73 (m, 1H), 1.62-1.49 (m, 3H), 0.85 (s, 6H); UPLC-MS-2e: Rt=3.35 min; MS m/z [M+H]+ 592.3/594.3; C-SFC-3 (mobile phase: CO2/[IPA+0.025% NH3]: 70/30): Rt=2.72 min. Example 190a was obtained as the first eluting peak: C-SFC-3 (mobile phase: CO2/[IPA+0.025% NH3]: 70/30): Rt=2.07 min.
To a solution of 3-((phenylsulfonyl)methylene)oxetane (Intermediate B4, 353 mg, 1.68 mmol) in MeOH (10 mL) under argon was added tert-butyl 6-(4-(5-chloro-6-methyl-1-(tetrahydro-2H-pyran-2-yl)-1H-indazol-4-yl)-5-methyl-3-(5,8-diazaspiro[3.5]nonan-5-yl)-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (intermediate C28, 1.34 mmol, 900 mg) and the the reaction mixture was stirred at 50° C. for 72 h. Magnesium (196 mg, 8.06 mmol) was added and the RM was stirred for 20 h. Magnesium (50 mg, 2.06 mmol) was added again and the RM wa further stirred at RT for 16 h to complete the reaction. The RM was diluted with a sat. aq. NaHCO3 solution, extracted with EtOAc and the combined organic extracts were washed with brine, dried (Na2SO4), filtered and evaporated. The crude residue was purified by normal phase chromatography (eluent: MeOH in CH2Cl2 0 to 12%). UPLC-MS-4: Rt=1.35 min; MS m/z [M+H]+ 720.3/722.3.
To a solution of tert-butyl 6-(4-(5-chloro-6-methyl-1-(tetrahydro-2H-pyran-2-yl)-1H-indazol-4-yl)-5-methyl-3-(8-(3-methyloxetan-3-yl)-5,8-diazaspiro[3.5]nonan-5-yl)-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 1, 400 mg, 0.47 mmol) in CH2Cl2 (10 mL) was added TFA (1.00 mL, 13.0 mmol) and the reaction mixture was stirred at RT for 72 h. The RM was evaporated to dryness to give the title compound as a trifluoroacetate salt which was used without purification in the next step. UPLC-MS-4: Rt=0.49 min min; MS m/z [M+H]+ 536.4/538.4.
To a solution of 5-(4-(5-chloro-6-methyl-1H-indazol-4-yl)-5-methyl-1-(2-azaspiro[3.3]heptan-6-yl)-1H-pyrazol-3-yl)-8-(3-methyloxetan-3-yl)-5,8-diazaspiro[3.5]nonane (Step 2, 0.44 mmol) in THF (10 mL) were added water (0.26 mL), NaHCO3 (0.73 g, 8.73 mmol) followed by acryloyl chloride (0.045 mL, 0.54 mmol). The reaction mixture was stirred at RT for 1 h. After completion of the reaction, LiOH (2M, 2.18 mL, 4.36 mmol) was added and the mixture was stirred at RT for 30 min. The RM was diluted with water, extracted with EtOAc (×2) and the combined organic extracts were washed with brine, dried (Na2SO4), filtered and evaporated. The crude residue was purified by reverse phase HPLC (RP-HPLC-1) to give the title compound. The isomers were separated by chiral SFC (C-SFC-4; mobile phase: CO2/[IPA+0.1% Et3N]: 72/28) to give the title compound Example 191b as the second eluting peak: 1H NMR (400 MHz, DMSO-d6) δ 12.9 (s, 1H), 7.57 (s, 1H), 7.44 (s, 1H), 6.30 (m, 1H), 6.10 (m, 1H), 5.67 (m, 1H), 4.74 (m, 1H), 4.35-4.27 (m, 4H), 4.05 (m, 3H), 3.99 (m, 1H), 2.80-2.65 (m, 6H), 2.47 (s, 3H), 2.27-2.08 (m, 4H), 2.04-1.92 (m, 2H), 1.98 (s, 3H), 1.82 (m, 1H), 1.62-1.54 (m, 3H), 1.14 (s, 3H); UPLC-MS-4: Rt=0.76 min; MS m/z [M+H]+ 590.3/592.3; C-SFC-3 (mobile phase: CO2/[IPA+0.1% Et3N]: 70/30): Rt=1.97 min. The other isomer Example 191a was obtained as the first eluting peak: C-SFC-3 (mobile phase: CO2/[IPA+0.1% Et3N]: 70/30): Rt=1.47 min.
To a solution of tert-butyl 6-(4-(5-chloro-6-methyl-1-(tetrahydro-2H-pyran-2-yl)-1H-indazol-4-yl)-3-((S)-2-ethyl-2-methylpiperazin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Intermediate C39, 0.91 mmol, 600 mg) in MeOH (8 mL) were added under argon 4-chloropyridazine hydrochloride (217 mg, 1.37 mmol) and Et3N (0.70 mL, 5.02 mmol). The reaction mixture was stirred at 80° C. for 18 h. The RM was diluted with a sat. aq. NaHCO3 solution, extracted with EtOAc and the combined organic extracts were washed with brine, dried (Na2SO4), filtered and evaporated. The crude residue was purified by normal phase chromatography (eluent: MeOH in CH2Cl2 0 to 7%). UPLC-MS-4: Rt=1.14 min; MS m/z [M+H]+ 730.4/732.4.
To a solution of tert-butyl 6-(4-(5-chloro-6-methyl-1-(tetrahydro-2H-pyran-2-yl)-1H-indazol-4-yl)-3-((S)-2-ethyl-2-methyl-4-(pyridazin-4-yl)piperazin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 1, 540 mg, 0.72 mmol) in CH2Cl2 (15 mL) was added under argon TFA (1.60 mL, 20.8 mmol) and the reaction mixture was stirred at RT for 4 h. The RM was evaporated to dryness to give the title compound as a trifluoroacetate salt which was used without purification in the next step. UPLC-MS-4: Rt=0.49 and 0.51 min min; MS m/z [M+H]+ 546.5/548.5.
To a solution of ((S)-5-chloro-4-(3-(2-ethyl-2-methyl-4-(pyridazin-4-yl)piperazin-1-yl)-5-methyl-1-(2-azaspiro[3.3]heptan-6-yl)-1H-pyrazol-4-yl)-6-methyl-1H-indazole (Step 2, 0.71 mmol) in THF (16 mL) were added water (0.41 mL), NaHCO3 (1.19 g, 14.2 mmol) followed by acryloyl chloride (0.07 mL, 0.84 mmol). The reaction mixture was stirred at RT for 1 h. The RM was diluted with water, extracted with EtOAc (×2) and the combined organic extracts were washed with brine, dried (Na2SO4), filtered and evaporated. The crude residue was purified by normal phase chromatography (eluent: MeOH in CH2Cl2 0 to 10%) to give the title compound. The isomers were separated by chiral SFC (C-SFC-4; mobile phase: CO2/[IPA+0.025% NH3]: 50/50) to give the title compound Example 192b as the second eluting peak: 1H NMR (400 MHz, DMSO-d6) δ 13.0 (s, 1H), 8.88 (br. s, 1H), 8.52 (m, 1H), 7.63 (s, 1H), 7.48 (s, 1H), 6.84 (m, 1H), 6.27 (m, 1H), 6.08 (m, 1H), 5.65 (m, 1H), 4.74 (m, 1H), 4.34 (s, 1H), 4.27 (s, 1H), 4.04 (s, 1H), 3.99 (m, 1H), 3.28-3.15 (m, 3H), 3.13-3.96 (m, 3H), 3.78-2.62 (m, 4H), 2.49 (s, 3H), 1.99 (s, 3H), 1.71 (m, 1H), 1.55 (m, 1H), 0.93 (br s, 3H), 0.60 (t, 3H); UPLC-MS-4: Rt=0.79 min; MS m/z [M+H]+ 600.4/602.5; C-SFC-3 (mobile phase: CO2/[IPA+0.1% Et3N]: 70/30): Rt=2.48 min. The other isomer Example 192a was obtained as the first eluting peak: C-SFC-3 (mobile phase: CO2/[IPA+0.1% Et3N]: 70/30): Rt=0.81 min.
To a mixture of tert-butyl 6-(4-(5-chloro-6-methyl-1-(tetrahydro-2H-pyran-2-yl)-1H-indazol-4-yl)-3-(2,2-dimethylpiperazin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Intermediate C38, 400 mg, 0.63 mmol), 4-bromo-1-methyl-1H-pyrazole (131 mg, 0.81 mmol), Pd(dba)2 (36.0 mg, 0.063 mmol) and bis(3,5-bis(trifluoromethyl)phenyl)(2′,6′-bis(dimethylamino)-3,6-dimethoxybiphenyl-2-yl)phosphine (CAS: 1810068-30-4, 52.2 mg, 0.069 mmol) in 1,4-dioxane (3.13 mL) was added NaOtBu (2M in THF, 439 μL, 0.88 mmol) and the reaction mixture was stirred at 85° C. for 16 h. After cooling to RT, the RM was poured into an aq. sat. NaHCO3 solution and extracted with CH2Cl2 (×3). The combined organic layers were dried (phase separator) and concentrated under reduced pressure. The crude residue was diluted with THF (10 mL), SiliaMetS®Thiol (0.26 mmol) was added and the mixture swirled for 1 h at 40° C. The mixture was filtered, the filtrate was concentrated and the crude residue was purified by normal phase chromatography (eluent: MeOH in CH2Cl2 0 to 5%) to give the title compound as a orange foam. UPLC-MS-2a: Rt=1.28 min; MS m/z [M+H]+ 718.4/720.4.
To tert-butyl 6-(4-(5-chloro-6-methyl-1-(tetrahydro-2H-pyran-2-yl)-1H-indazol-4-yl)-3-(2,2-dimethyl-4-(1-methyl-1H-pyrazol-4-yl)piperazin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 1, 162 mg, 0.23 mmol) in CH2Cl2 (1.10 mL) was added TFA (521 μL, 6.77 mmol) and the reaction mixture was stirred at RT for 1 h. The RM was concentrated, dioxane was added and the mixture was frozen and lyophilised to give the title compound as a trifluoroacetate salt which was used in the next step without further purification. UPLC-MS-2a: Rt=0.78 min; MS m/z [M+H]+ 534.3/536.3.
To a solution of 5-chloro-4-(3-(2,2-dimethyl-4-(1-methyl-1H-pyrazol-4-yl)piperazin-1-yl)-5-methyl-1-(2-azaspiro[3.3]heptan-6-yl)-1H-pyrazol-4-yl)-6-methyl-1H-indazole trifluoroacetate in THF (9.0 mL) at 0° C. were added slowly NaHCO3 (0.5 M aqueous, 4.51 mL, 2.26 mmol) and a solution of acryloyl chloride (19.2 μL, 0.24 mmol) in THF (100 μL). The reaction mixture was stirred at 0° C. for 1 h, then diluted with CH2Cl2 and quenched with a sat. aq. NaHCO3 solution. The combined organic layers were dried and concentrated. The crude residue was purified by normal phase chromatography (eluent: MeOH in CH2Cl2 0 to 10%) to give the title compound as a yellow foam. The isomers were separated by chiral SFC (C-SFC-7: mobile phase: CO2/IPA: 50/50). The purified fractions were concentrated to give the title compound Example 193b as the second eluting peak: 1H NMR (400 MHz, DMSO-d6) δ 12.95 (s, 1H), 7.59 (s, 1H), 7.44 (s, 1H), 7.10 (s, 1H), 7.01 (s, 1H), 6.40-6.22 (m, 1H), 6.15-6.02 (m, 1H), 5.73-5.57 (m, 1H), 4.88-4.62 (m, 1H), 4.34 (s, 1H), 4.30 (s, 1H), 4.06 (s, 1H), 4.01 (s, 1H), 3.65 (s, 3H), 2.98-2.89 (m, 2H), 2.80-2.69 (m, 4H), 2.47 (s, 3H), 2.42-2.38 (m, 2H), 2.35-2.29 (m, 2H), 2.00 (s, 3H), 1.20 (s, 3H), 1.12 (s, 3H); UPLC-MS-4: Rt=0.98 min; MS m/z [M+H]+ 588.5 m 590.5; C-SFC-8 (mobile phase: CO2/PA: 50/50): Rt=2.36 m. The other isomer Example 193a was obtained as the first eluting peak: C-SFC-8 (mobile phase: CO2/IPA: 50/50): Rt=1.65 m.
Method-9a: similar to Method-9 except that Step 3 was performed using acrylic acid and T3P in CH2Cl2 as described in Step 3 in Method-7.
The examples 194a and 194b were prepared using analogous methods to Method-9 from intermediates (in Step 1) described in the intermediates synthesis section.
(S)-1-(6-(4-(5-chloro-6- methyl-1H-indazol-4-yl)- 3-(2-ethyl-2-methyl-4-(1- methyl-1H-imidazol-2- yl)piperazin-1-yl)-5- methyl-1H-pyrazol-1-yl)- 2-azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
To a solution of 1-(4-(4-(5-chloro-1-(tetrahydro-2H-pyran-2-yl)-1H-indazol-4-yl)-5-methyl-1H-pyrazol-3-yl)piperazin-1-yl)ethan-1-one (intermediate C15, 170 mg, 0.38 mmol) and O-(tert-butyl) 1-methyl-6-(tosyloxy)-2-azaspiro[3.3]heptane-2-carbothioate (intermediate C6a, 160 mg, 0.40 mmol) in anhydrous DMA (2.65 mL) was added cesium carbonate (250 mg, 0.77 mmol) and the reaction mixture was heated at 80° C. under nitrogen atmosphere for 16 h. The RM was poured into a sat. aq. NaHCO3 solution and extracted with EtOAc (×3). The combined organic extracts were washed with water (×2), dried (phase separator), evaporated and the crude residue was purified by normal phase chromatography (eluent: MeOH in CH2Cl2 0 to 10%) to give the title compound as a yellow oil and as the major regioisomer. UPLC-MS-1a: Rt=1.41 and 1.43 min; MS m/z [M+H]+ 668.5/670.5.
To a solution of O-(tert-butyl) 6-(3-(4-acetylpiperazin-1-yl)-4-(5-chloro-1-(tetrahydro-2H-pyran-2-yl)-1H-indazol-4-yl)-5-methyl-1H-pyrazol-1-yl)-1-methyl-2-azaspiro[3.3]heptane-2-carbothioate (Step 1, 68 mg, 0.10 mmol) in CH2Cl2 (0.48 mL) was added TFA (223 μL, 2.90 mmol) and the reaction mixture was stirred at RT for 2 h. The reaction mixture was poured into water and extracted twice with CH2Cl2. The aqueous layer was freezed and lyophilized to give the TFA salt of the title compound which was used directly in the next step. UPLC-MS-1a: Rt=0.61 min; MS m/z [M+H]+ 468.4/470.5.
To an ice-cooled cloudy solution of 1-(4-(4-(5-Chloro-1H-indazol-4-yl)-5-methyl-1-(1-methyl-2-azaspiro[3.3]heptan-6-yl)-1H-pyrazol-3-yl)piperazin-1-yl)ethan-1-one trifluoroacetate (Step 2, 0.07 mmol) in CH2Cl2 (890 μL), was added DIPEA (46 μL, 0.26 mmol) followed by a solution of acryloyl chloride (6.10 μL, 0.07 mmol) in CH2Cl2 (0.21 mL). The reaction mixture was stirred at 0-5° C. for 20 min. The RM was quenched at 0-5° C. with MeOH (few drops), and stirred at that temperature for 30 min. A sat. aq. NaHCO3 solution and CH2Cl2 were added, the layers were extracted and the aqueous layer was back-extracted with CH2Cl2 (×2). The combined organic extracts were dried (phase separator), evaporated and the crude residue was purified by normal phase chromatography (eluent: MeOH in CH2Cl2 0 to 10%) to give the title compound. The isomers were separated by chiral HPLC (C-HPLC-13: mobile phase: n-heptane/CH2Cl2/IPA 60:20:20). The purified fractions were concentrated, dioxane was added and the the material was lyophilized to give the title compound Example 195a as the first eluting peak (white powder): 1H NMR (400 MHz, DMSO-d6) δ mixture of rotamers: 13.2 (s, 1H), 7.73 (s, 1H), 7.53 (d, 1H), 7.45 (d, 1H), 6.36-6.27 (m, 1H), 6.11 (m, 1H), 5.67 (dd, 1H), 4.73 (m, 1H), 4.46 (m, 0.5H), 4.32-4.24 (m, 1.5H), 3.99 (m, 1H), 3.31-3.12 (m, 4H), 2.89-2.63 (m, 7H), 2.45 (m, 1H), 1.95 (s, 3H), 1.89 (s, 3H), 1.40 (d, 1.5H), 1.35 (d, 1.5H); UPLC-MS-1a: Rt=0.85 min; MS m/z [M+H]+ 522.3/524.3; C-HPLC-16 (mobile phase: n-heptane/CH2Cl2/IPA 60:20:20): Rt=8.49 min. The other isomer Example 195b was obtained as the second eluting peak: UPLC-MS-1a: Rt=0.86 min; MS m/z [M+H]+ 522.3/524.3, C-HPLC-16 (mobile phase: n-heptane/CH2Cl2/IPA 60:20:20): Rt=10.94 min.
Method-10a: similar to Method-10 except that Step 1 was performed in DMF at 100° C. instead of DMA.
Method-10b: similar to Method-10 except that Step 3 was performed using Et3N, acrylic acid and T3P in CH2Cl2 as described in Step 5 in Method-12.
The following examples 196a to 201b were prepared using analogous methods to Method-0 from intermediates (in Step 1) described in the intermediates synthesis section.
In Step 3, If observed the side product resulting from reaction of the acryloyl chloride with the indazole NH was hydrolyzed by treatment with LiOH as described in Method-5 or in Method-12.
When the final separation of isomers is performed by preparative HPLC using acidic conditions the purified fractions were extracted with a sat. aq. NaHCO3 solution before lyophilization from a mixture of CH3CN/H2O to give the title compound as a free base.
1-(6-(3-(4-acetylpiperazin- 1-yl)-4-(5-chloro-1H- indazol-4-yl)-5-methyl-1H- pyrazol-1-yl)-1-methyl-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
1-(6-(3-(4-acetylpiperazin- 1-yl)-4-(5-chloro-1H- indazol-4-yl)-5-methyl-1H- pyrazol-1-yl)-1-methyl-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
1-(6-(3-(4-acetylpiperazin- 1-yl)-4-(5-chloro-1H- indazol-4-yl)-5-methyl-1H- pyrazol-1-yl)-1-methyl-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
1-(6-(3-((S)-4-(((R)-1,4- dioxan-2-yl)methyl)-2- ethyl-2-methylpiperazin-1- yl)-4-(5-chloro-6-methyl- 1H-indazol-4-yl)-5-methyl- 1H-pyrazol-1-yl)-1-methyl- 2-azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
1-(6-(3-((S)-4-(((R)-1,4- dioxan-2-yl)methyl)-2- ethyl-2-methylpiperazin-1- yl)-4-(5-chloro-6-methyl- 1H-indazol-4-yl)-5-methyl- 1H-pyrazol-1-yl)-1-methyl- 2-azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
1-(6-(4-(5,6-dichloro-1H- indazol-4-yl)-3-((R)-2,2- dimethyl-4-((4-(oxetan-3- yl)piperazin-1- yl)methyl)piperidin-1-yl)-5- methyl-1H-pyrazol-1-yl)-1- methyl-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
To a solution of tert-butyl 6-(3-(4-(3-methoxyazetidin-1-yl)-2,2-dimethylpiperidin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate isomer 1 (Intermediate C78a, 1.25 g, 2.64 mmol) in acetonitrile (10 mL) was added NIS (0.66 g, 2.78 mmol) and the reaction mixture was stirred at RT for 30 min. Water was added and the mixture was extracted with EtOAc (×2). The combined organic extracts were dried (Na2SO4), filtered and concentrated. The crude residue was purified by normal phase chromatography (eluent: (CH2Cl2/10% MeOH) in CH2Cl2, 0 to 30%) to give the title compound. UPLC-MS-4: Rt=0.97 min; MS m/z [M+H]+ 600.4.
To a mixture of tert-butyl 6-(4-iodo-3-(4-(3-methoxyazetidin-1-yl)-2,2-dimethylpiperidin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 1, 1.23 g, 2.05 mmol), 5-chloro-6-methyl-1-(tetrahydro-2H-pyran-2-yl)-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-indazole (Intermediate D1, 1.00 g, 2.67 mmol), RuPhos (96.0 mg, 0.21 mmol) and RuPhos-Pd-G3 (137 mg, 0.16 mmol) in dioxane (10 mL) was added K3PO4 (2 M in water, 3.80 mL, 6.15 mmol) and the reaction mixture was stirred at 95° C. for 1 h under nitrogen atmosphere. The reaction mixture was poured into water and extracted with EtOAc (×2). The combined organic extracts were dried (Na2SO4) and concentrated. The crude residue was diluted with THF (2 mL), SiliaMetS®Thiol (0.15 mmol) was added and the mixture swirled for 1 h at 40° C. The mixture was filtered, the filtrate was concentrated and the crude residue was purified by normal phase chromatography (eluent: (CH2Cl2/10% MeOH) in CH2Cl2, 0 to 35%) to give the title compound. UPLC-MS-4: Rt=1.17 min; MS m/z [M+H]+ 722.5/724.5.
To a solution of tert-butyl 6-(4-(5-chloro-6-methyl-1-(tetrahydro-2H-pyran-2-yl)-1H-indazol-4-yl)-3-(4-(3-methoxyazetidin-1-yl)-2,2-dimethylpiperidin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 2, 1.17 g, 1.62 mmol) in CH2Cl2 (5 mL) was added under argon TFA (1.25 mL, 16.2 mmol) and the reaction mixture was stirred at RT for 1 h. The reaction mixture was neutralized by addition of a sat. aq. NaHCO3 solution and extracted with EtOAc, then with nbuOH. The combined organic extracts were washed with water, dried (Na2S2O4) and concentrated to dryness. The compound was used without purification in the next step. UPLC-MS-4: Rt=0.43/0.48 min; MS m/z [M+H]+ 538.4/540.3.
To a stirred solution of 5-chloro-4-(3-(4-(3-methoxyazetidin-1-yl)-2,2-dimethylpiperidin-1-yl)-5-methyl-1-(2-azaspiro[3.3]heptan-6-yl)-1H-pyrazol-4-yl)-6-methyl-1H-indazole (Step 3, 1.62 mmol) in THF (6 mL) at 0° C. was added NaHCO3 (0.5M in water, 19.5 mL, 9.73 mmol) and acryloyl chloride (0.20 mL, 2.43 mmol). The reacture mixture was stirred at 0° C. for 15 min. The reaction mixture was diluted with EtOAc and extracted with water (×2). The organic layers was dried (Na2SO4) and concentrated. The isomers were separated by chiral SFC (C-SFC-4: mobile phase: CO2/[IPA+0.1% NH3]: 65/35). The purified fractions were concentrated, dioxane was added and the material was lyophilized to give the title compound Example 202b as the second eluting peak (white powder): 1H NMR (400 MHz, DMSO-d6) δ 12.95 (s, 1H), 7.53 (s, 1H), 7.44 (s, 1H), 6.30 (m, 1H), 6.10 (m, 1H), 5.67 (m, 1H), 4.73 (m, 1H), 4.33 (s, 1H), 4.28 (s, 1H), 4.05 (s, 1H), 3.99 (s, 1H), 3.40-3.32 (m, 2H), 3.10 (s, 3H), 3.05 (m, 1H), 2.81 (m, 1H), 2.74-2.58 (m, 6H), 2.47 (s, 3H), 2.14 (m, 1H), 1.99 (s, 3H), 1.45 (m, 1H), 1.30 (m, 1H), 1.11 (s, 3H), 0.84-0.70 (m, 4H), 0.64 (m, 1H); UPLC-MS-4: Rt=0.79 min; MS m/z [M+H]+ 592.5/594.5; C-SFC-3 (mobile phase: CO2/[IPA+0.1% Et3N]: 65/35): Rt=1.20 min. The other isomer Example 202a was obtained as the first eluting peak: C-SFC-3 (mobile phase: CO2/[IPA+0.1% Et3N]: 65/35): Rt=0.82 min.
Method-11a: similar to Method-11 except that in Step 1 NBS was used instead of NIS to give the corresponding 4-bromo analog.
Method-11b: similar to Method-11 except that in Step 3, after completion of the reaction, the reaction mixture was concentrated and the resulting trifluoroacetate salt was used directly in the next step as described in Step 2 Method-8.
Method-11c: similar to Method-11 except that Step 4 was performed using E3N acrylic acid and T3P in CH2Cl2 as described in Step 3 in Method-7.
Method-11d: similar to Method-11 except that in Step 2 toluene was used as a solvent instead of dioxane.
The following examples 203a to 121 b were prepared using analogous methods to Method-11 from intermediates (in Step 1, 2 or 3) described in the intermediates synthesis section.
In Step 4, If observed the side product resulting from reaction of the acryloyl chloride with the indazole NH was hydrolyzed by treatment with LiOH as described in Method-5 or in Method-12.
When the final separation of isomers is performed by preparative HPLC using acidic conditions the purified fractions were extracted with a sat. aq. NaHCO3 solution before lyophilization from CH3CN/H2O to give the title compound as a free base.
1-(6-(4-(5-Chloro-6-methyl- 1H-indazol-4-yl)-3-(4-(3- methoxyazetidin-1-yl)-2,2- dimethylpiperidin-1-yl)-5- methyl-1H-pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
1-(6-(4-(5-chloro-6-methyl- 1H-indazol-4-yl)-3-(4-(3- fluoroazetidin-1-yl)-2,2- dimethylpiperidin-1-yl)-5- methyl-1H-pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
1-(6-(4-(5-chloro-6-methyl- 1H-indazol-4-yl)-3-(4-(3- fluoroazetidin-1-yl)-2,2- dimethylpiperidin-1-yl)-5- methyl-1H-pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
1-(1-(1-(2-acryloyl-2- azaspiro[3.3]heptan-6-yl)-4- (5-chloro-6-methyl-1H- indazol-4-yl)-5-methyl-1H- pyrazol-3-yl)-2,2- dimethylpiperidin-4-yl)-3- methylazetidine-3-carbonitrile
1-(6-(4-(5-chloro-6-methyl- 1H-indazol-4-yl)-5-methyl-3- (4,8,8-trimethyl-1-oxa-4,9- diazaspiro[5.5]undecan-9-yl)- 1H-pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
1-(6-(4-(5-chloro-6-methyl- 1H-indazol-4-yl)-5-methyl-3- (4,8,8-trimethyl-1-oxa-4,9- diazaspiro[5.5]undecan-9-yl)- 1H-pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
1-(6-(4-(5,6-dichloro-1H- indazol-4-yl)-3-(4-(3- methoxyazetidin-1-yl)-2,2- dimethylpiperidin-1-yl)-5- methyl-1H-pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
1-(6-(4-(5-chloro-6-methyl- 1H-indazol-4-yl)-3-(4-(3- methoxyazetidine-1- carbonyl)-2,2- dimethylpiperidin-1-yl)-5- methyl-1H-pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
1-(6-(4-(5,6-dichloro-1H- indazol-4-yl)-3-(2,2-dimethyl- 4-(4-methylpiperazine-1- carbonyl)piperidin-1-yl)-5- methyl-1H-pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
1-(6-(4-(5,6-dichloro-1H- indazol-4-yl)-3-(2,2-dimethyl- 4-((1R,4R)-5- (methylsulfonyl)-2,5- diazabicyclo[2.2.1]heptan-2- yl)piperidin-1-yl)-5-methyl- 1H-pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
In an ace tube, tert-butyl 6-(3-bromo-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Intermediate C1, 6.00 g, 16.8 mmol), (R)-4-((2,2-dimethylpiperidin-4-yl)methyl)morpholine (Intermediate A70, 4.29 g, 20.2 mmol), Pd(dba)2 (968 mg, 1.68 mmol) and bis(3,5-bis(trifluoromethyl)phenyl)(2′,6′-bis(dimethylamino)-3,6-dimethoxybiphenyl-2-yl)phosphine (CAS: 1810068-30-4, 1.02 g, 1.35 mmol) were suspended in toluene (75 mL). NaOtBu (2 M in THF, 25.3 mL, 55.0 mmol) was added, the vial was flushed with N2 and the reaction mixture was placed in a pre-heated bath at 90° C. and stirred for 16 h. Then the RM was poured into a sat. aq. NaHCO3 solution and extracted with EtOAc (×3). The combined organic layers were dried (Na2SO4), filtered and concentrated under reduced pressure and the crude residue was purified by normal phase chromatography (eluent: MeOH in CH2Cl2 0 to 10%) to give the title compound as a brown foam. UPLC-MS-4: Rt=0.62 min; MS m/z [M+H]+ 488.5.
Alternatively Tert-butyl (R)-6-(3-(2,2-dimethyl-4-(morpholinomethyl)piperidin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate can be prepare as described for C116.
To an ice-cooled solution of tert-butyl (R)-6-(3-(2,2-dimethyl-4-(morpholinomethyl)piperidin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 1, 930 mg, 1.91 mmol) in CH3CN (20 mL) was added NIS (429 mg, 1.91 mmol) and the mixture was stirred under N2 atmosphere at 0° C. After completion (1 h), the reaction mixture was poured into 10% Na2S2O3 aq. solution and extracted with EtOAc (×2). The combined organic layers were washed with an aq. sat. NaHCO3 solution, dried (Na2SO4), filtered and concentrated to give the title product which was used without further purification in the next step. UPLC-MS-4: Rt=0.99 min; MS m/z [M+H]+ 614.5.
To a mixture of tert-butyl (R)-6-(3-(2,2-dimethyl-4-(morpholinomethyl)piperidin-1-yl)-4-iodo-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 2, 1.05 g, 1.71 mmol), 5,6-dichloro-1-(tetrahydro-2H-pyran-2-yl)-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-indazole (Intermediate D6, 815 mg, 2.05 mmol), RuPhos (80.0 mg, 0.17 mmol) and RuPhos-Pd-G3 (143 mg, 0.17 mmol) in toluene (20 mL) was added K3PO4 (2 M in water, 2.57 mL, 5.13 mmol) and the reaction mixture was stirred at 90° C. for 2 h under nitrogen atmosphere. The reaction mixture was poured into a sat. aq. NaHCO3 solution and extracted with EtOAc (×3). The combined organic extracts were dried (Na2SO4), filtered and concentrated. The crude residue was diluted with THF (100 mL), SiliaMetS®Thiol (21.3 mmol) was added and the mixture swirled for 1 h at 40° C. The mixture was filtered, the filtrate was concentrated and the crude residue was purified by normal phase chromatography (eluent: EtOAc in n-heptane 0 to 100%) to give the title compound as a beige foam. UPLC-MS-2a: Rt=1.19 min; MS m/z [M+H]+ 756.6/758.6/760.6.
To a solution of tert-butyl 6-(4-(5,6-dichloro-1-(tetrahydro-2H-pyran-2-yl)-1H-indazol-4-yl)-3-((R)-2,2-dimethyl-4-(morpholinomethyl)piperidin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 3, 4.94 g, 6.20 mmol) in CH2Cl2 (50 mL) was added TFA (14.3 mL, 186 mmol) and the solution was stirred at RT for 16 h. The RM was concentrated, co-evaporated with CH2Cl2 (×2) and dried under high vacuum to give the title compound as a trifluoroacetate salt which was used in the next step without further purification. UPLC-MS-4: Rt=0.43 and 0.49 min; MS m/z [M+H]+ 572.5/574.5/576.5 .
A mixture of acrylic acid (0.65 mL, 9.43 mmol), propylphosphonic anhydride (50% in EtOAc, 5.56 mL, 9.43 mmol) and DIPEA (17.6 mL, 101 mmol) in CH2Cl2 (80 mL) was stirred for 15 min and then added under a nitrogen atmosphere to a solution of (R)-4-((1-(4-(5,6-dichloro-1H-indazol-4-yl)-5-methyl-1-(2-azaspiro[3.3]heptan-6-yl)-1H-pyrazol-3-yl)-2,2-dimethylpiperidin-4-yl)methyl)morpholine (Step 4, 6.29 mmol) in CH2Cl2 (40 mL). The reaction mixture was stirred at RT for 30 min. After completion of the reaction, the reaction mixture was poured into a sat. aq. NaHCO3 solution and extracted with CH2Cl2 (×2). The combined organic extracts were dried (phase separator) and evaporated. The crude residue was diluted in THF, LiOH (2 M, 31.4 mL, 62.9 mmol) was added and the mixture was vigorously stirred at RT for 1 h. EtOAc was added and the layers were separated. The aqueous layer was back-extracted with EtOAc, the combined organic extracts were dried (phase separator) and evaporated. The crude residue was purified by normal phase chromatography (eluent: MeOH in CH2Cl2 0 to 10%) to give the title compound. The isomers were separated by chiral SFC (C-SFC-4; mobile phase: CO2/[IPA+0.1% Et3N] 72/28) to give after lyophilization (CH3CN/water) the title compound Example 213b as the second eluting peak (white solid): 1H NMR (400 MHz, DMSO-d6) δ 13.2 (s, 1H), 7.78 (s, 1H), 7.63 (s, 1H), 6.30 (m, 1H), 6.09 (m, 1H), 5.67 (m, 1H), 4.75 (m, 1H), 4.32 (s, 1H), 4.28 (s, 1H), 4.05 (s, 1H), 4.00 (s, 1H), 3.51 (m, 4H), 3.23-3.12 (m, 1H), 2.84-2.65 (m, 5H), 2.28-2.19 (m, 4H), 2.00 (s, 3H), 1.92 (m, 2H), 1.78 (m, 1H), 1.54 (m, 1H), 1.35 (m, 1H), 1.12 (s, 3H), 0.77-0.56 (m, 5H). UPLC-MS-4: Rt=0.78 min; MS m/z [M+H]+ 626.6/628.6/630.6. C-SFC-3 (mobile phase: CO2/[IPA+0.025% NH3]: 75/25): Rt=2.40 min. The other isomer Example 213a was obtained as the first eluting peak: C-SFC-3 (mobile phase: CO2/[IPA+0.025% NH3]: 75/25): Rt=1.52 min.
Method-12a: similar to Method-12 except that Step 5 was performed using acryloyl chloride and NaHCO3 as described in Method-8 Step 3.
Method-12b: similar to Method-12 except that Step 2 was performed in THF instead of CH3CN.
Method-12c: similar to Method-12 except that Step 3 was performed using chloro(crotyl)(tri-tert-butylphosphine)Pd(II) (CAS [1334497-00-5]) as a catalyst in dioxane as solvent instead of RuPhos, RuPhos-Pd-G3 in toluene.
The following examples 214a to 242b were prepared using analogous methods to Method-12 from intermediates (in Step 1, 2 and 3) described in the intermediates synthesis section or commercially available.
When the final separation of isomers is performed by preparative HPLC using acidic conditions the purified fractions were extracted with a sat. aq. NaHCO3 solution before lyophilization from CH3CN/H2O to give the title compound as a free base.
(S)-1-(6-(4-(5,6-dichloro- 1H-indazol-4-yl)-3-(2,2- dimethyl-4- (morpholinomethyl) piperidin-1-yl)-5-methyl-1H- pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
(R)-1-(6-(4-(5-chloro-6- methyl-1H-indazol-4-yl)- 3-(2,2-dimethyl-4- (morpholinomethyl) piperidin-1-yl)-5-methyl-1H- pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
(S)-1-(6-(4-(5-chloro-6- methyl-1H-indazol-4-yl)- 3-(2,2-dimethyl-4- (morpholinomethyl) piperidin-1-yl)-5-methyl-1H- pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
1-(6-(3-(4-(((1S,4S)-2- oxa-5- azabicyclo[2.2.1]heptan- 5-yl)methyl)-2,2- dimethylpiperidin-1-yl)-4- (5,6-dichloro-1H-indazol- 4-yl)-5-methyl-1H- pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
1-(6-(4-(5,6-dichloro-1H- indazol-4-yl)-3-(2,2- dimethyl-3- (morpholinomethyl) pyrrolidin-1-yl)-5-methyl-1H- pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
1-(6-(4-(5,6-dichloro-1H- indazol-4-yl)-3-(2,2- dimethyl-3- (morpholinomethyl) pyrrolidin-1-yl)-5-methyl-1H- pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
1-(6-(4-(5,6-dichloro-1H- indazol-4-yl)-3-(2,2- dimethyl-4- (morpholinomethyl)-3,6- dihydropyridin-1(2H)-yl)- 5-methyl-1H-pyrazol-1- yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
1-(6-(4-(5,6-dichloro-1H- indazol-4-yl)-3-(2- (methoxymethyl)-2- methyl-4- (morpholinomethyl) piperidin-1-yl)-5-methyl-1H- pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
1-(6-(4-(5-chloro-6- methyl-1H-indazol-4-yl)- 3-(2-ethyl-2-methyl-4- (morpholinomethyl) piperidin-1-yl)-5-methyl-1H- pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
(R)-1-(6-(4-(5-chloro-6- methyl-1H-indazol-4-yl)- 3-(2,2-dimethyl-4- (morpholinomethyl) piperidin-1-yl)-1H-pyrazol-1- yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
(R)-1-(6-(4-(5,6-dichloro- 1H-indazol-4-yl)-3-(2,2- dimethyl-4- (morpholinomethyl)piperidin- 1-yl)-5-(methyl-d3)- 1H-pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
(R)-1-(2-acryloyl-2- azaspiro[3.3]heptan-6- yl)-4-(5-chloro-3,6- dimethyl-1H-indazol-4- yl)-3-(2,2-dimethyl-4- (morpholinomethyl)piperidin- 1-yl)-1H-pyrazole-5- carbonitrile
1-(6-(4-(5,6-dichloro-1H- indazol-4-yl)-3-(2,2- dimethyl-4-((tetrahydro- 1H-furo[3,4-c]pyrrol- 5(3H)-yl)methyl)piperidin- 1-yl)-5-methyl-1H- pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
1-(6-(4-(5,6-dichloro-1H- indazol-4-yl)-3-(2,2- dimethyl-4-((tetrahydro- 1H-furo[3,4-c]pyrrol- 5(3H)-yl)methyl)piperidin- 1-yl)-5-methyl-1H- pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
1-(6-(3-(4-((6-oxa-3- azabicyclo[3.1.1]heptan- 3-yl)methyl)-2,2- dimethylpiperidin-1-yl)-4- (5,6-dichloro-1H-indazol- 4-yl)-5-methyl-1H- pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
1-(6-(3-(4-((6-oxa-3- azabicyclo[3.1.1]heptan- 3-yl)methyl)-2,2- dimethylpiperidin-1-yl)-4- (5,6-dichloro-1H-indazol- 4-yl)-5-methyl-1H- pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
1-(6-(4-(5-chloro-6- methyl-1H-indazol-4-yl)- 3-(4-((3-methoxyazetidin- 1-yl)methyl)-2,2- dimethylpiperidin-1-yl)-5- methyl-1H-pyrazol-1-yl)- 2-azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
1-(6-(4-(5,6-dichloro-1H- indazol-4-yl)-3-(4- (((4aR,7aS)-hexahydro- 6H-[1,4]dioxino[2,3- c]pyrrol-6-yl)methyl)-2,2- dimethylpiperidin-1-yl)-5- methyl-1H-pyrazol-1-yl)- 2-azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
1-(6-(4-(5,6-dichloro-1H- indazol-4-yl)-3-(4- (((4aR,7aS)-hexahydro- 6H-[1,4]dioxino[2,3- c]pyrrol-6-yl)methyl)-2,2- dimethylpiperidin-1-yl)-5- methyl-1H-pyrazol-1-yl)- 2-azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
(R)-1-(6-(4-(6-chloro-5- methyl-1H-indazol-4-yl)- 3-(2,2-dimethyl-4- (morpholinomethyl)piperidin- 1-yl)-5-methyl-1H- pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
(R)-1-(6-(3-(4-((5-oxa-2- azaspiro[3.4]octan-2- yl)methyl)-2,2- dimethylpiperidin-1-yl)-4- (5,6-dichloro-1H-indazol- 4-yl)-5-methyl-1H- pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
1-(6-(4-(5,6-dichloro-1H- indazol-4-yl)-3-(4-((1,1- dioxidothiomorpholino) methyl)-2,2- dimethylpiperidin-1-yl)-5- methyl-1H-pyrazol-1-yl)- 2-azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
1-(6-(4-(5,6-dichloro-1H- indazol-4-yl)-3-(4-((1,1- dioxidothiomorpholino) methyl)-2,2- dimethylpiperidin-1-yl)-5- methyl-1H-pyrazol-1-yl)- 2-azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
1-(6-(4-(5,6-dichloro-1H- indazol-4-yl)-3-(4- hydroxy-2,2-dimethyl-4- (morpholinomethyl)piperidin- 1-yl)-5-methyl-1H- pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
1-(6-(4-(5,6-dichloro-1H- indazol-4-yl)-3-(4- hydroxy-2,2-dimethyl-4- (morpholinomethyl)piperidin- 1-yl)-5-methyl-1H- pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
4-((1-(1-(2-acryloyl-2- azaspiro[3.3]heptan-6- yl)-4-(5,6-dichloro-1H- indazol-4-yl)-5-methyl- 1H-pyrazol-3-yl)-2,2- dimethylpiperidin-4- yl)methyl)-1- methylpiperazin-2-one
1-((1-(1-(2-acryloyl-2- azaspiro[3.3]heptan-6- yl)-4-(5,6-dichloro-1H- indazol-4-yl)-5-methyl- 1H-pyrazol-3-yl)-2,2- dimethylpiperidin-4- yl)methyl)-4- methylpiperazin-2-one
(R)-1-(6-(4-(3-amino-5,6- dichloro-1H-indazol-4-yl)- 3-(2,2-dimethyl-4- (morpholinomethyl)piperidin- 1-yl)-5-methyl-1H- pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
(R)-1-(6-(4-(3-amino-5- chloro-6-methyl-1H- indazol-4-yl)-3-(2,2- dimethyl-4- (morpholinomethyl)piperidin- 1-yl)-5-methyl-1H- pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
A solution of tert-butyl (R)-6-(3-(4-formyl-2,2-dimethylpiperidin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (described in the synthesis of Intermediate C116 (Step 1), 6.83 g, 16.4 mmol) and 1-(oxetan-3-yl)piperazine (CAS [1254115-23-5], 2.56 g, 18.0 mmol) in dichloroethane (80 mL) was stirred under a nitrogen atmosphere at 0-5° C. for 10 min. Sodium triacetoxyborohydride (5.20 g, 24.6 mmol) was added and the reaction mixture was stirred at 0-5° C. for 30 min. The RM was poured into a sat. aq. NaHCO3 solution and extracted with CH2Cl2 (×3). The combined organic layers were washed with a sat. aq. NaHCO3 solution, dried (phase separator) and concentrated. The crude residue was purified by normal phase chromatography (eluent: MeOH in CH2Cl2 0 to 14%) to give the title compound. UPLC-MS-4: Rt=0.64 min; MS m/z [M+H]+ 543.6.
To an ice-cooled solution of tert-butyl (R)-6-(3-(2,2-dimethyl-4-((4-(oxetan-3-yl)piperazin-1-yl)methyl)piperidin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 1, 6.81 g, 12.6 mmol) in CH3CN (120 mL) was added NIS (2.97 g, 13.2 mmol) and the mixture was stirred under N2 atmosphere at 0° C. After completion (10 min), the reaction mixture was poured into 10% Na2S2O3 aq. solution and extracted with CH2Cl2 (×2). The combined organic layers were washed with an aq. sat. NaHCO3 solution, dried (phase separator) and concentrated to give the title product which was used without further purification in the next step. UPLC-MS-4: Rt=0.96 min; MS m/z [M+H]+ 669.5.
To a mixture of tert-butyl (R)-6-(3-(2,2-dimethyl-4-((4-(oxetan-3-yl)piperazin-1-yl)methyl)piperidin-1-yl)-4-iodo-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 2, 8.41 g, 12.6 mmol), 5,6-dichloro-1-(tetrahydro-2H-pyran-2-yl)-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-indazole (Intermediate D6, 6.49 g, 16.35 mmol), RuPhos (599 mg, 1.26 mmol) and RuPhos-Pd-G3 (1.07 g, 1.26 mmol) in toluene (120 mL) was added K3PO4 (2 M in water, 18.9 mL, 37.8 mmol) and the reaction mixture was stirred at 85° C. for 1.5 h under nitrogen atmosphere. The reaction mixture was poured into a sat. aq. NaHCO3 solution and extracted with EtOAc (×3). The combined organic extracts were dried (phase separator) and concentrated. The crude residue was diluted with THF (100 mL), SiliaMetS®Thiol (5.03 mmol) was added and the mixture swirled for 1 h at 40° C. The mixture was filtered, the filtrate was concentrated and the crude residue was purified by normal phase chromatography (eluent: EtOAc in n-heptane 0 to 100% then 10% MeOH in CH2Cl2) to give the title compound as a brown foam. UPLC-MS-4: Rt=1.18 and 1.20 min; MS m/z [M+H]+ 811.4/813.4/815.4.
To a solution of tert-butyl 6-(4-(5,6-dichloro-1-(tetrahydro-2H-pyran-2-yl)-1H-indazol-4-yl)-3-((R)-2,2-dimethyl-4-((4-(oxetan-3-yl)piperazin-1-yl)methyl)piperidin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 3, 7.59 g, 9.37 mmol) in CH2Cl2 (31 mL) was added TFA (22.6 mL, 281 mmol) and the solution was stirred at RT for 1.5 h. The RM was concentrated, co-evaporated with CH2Cl2 (×2) and dried under high vacuum to give the title compound as a trifluoroacetate salt which was used in the next step without further purification. UPLC-MS-4: Rt=0.47 and 0.53 min; MS m/z [M+H]+ 627.4/629.4/631.4.
A mixture of acrylic acid (0.77 mL, 11.2 mmol), propylphosphonic anhydride (50% in EtOAc, 8.27 mL, 14.0 mmol) and DIPEA (32.7 mL, 187 mmol) in CH2Cl2 (125 mL) was stirred for 15 min under argon atmosphere and added to an ice-cooled solution of (R)-5,6-dichloro-4-(3-(2,2-dimethyl-4-((4-(oxetan-3-yl)piperazin-1-yl)methyl)piperidin-1-yl)-5-methyl-1-(2-azaspiro[3.3]heptan-6-yl)-1H-pyrazol-4-yl)-1H-indazole (Step 4, 9.36 mmol) in CH2Cl2 (62.5 mL). The reaction mixture was stirred at RT under argon for 10 min and poured into a sat. aq. NaHCO3 solution. The layers were separated and the aqueous layer was back-extracted with CH2Cl2 (×3). The combined organic layers were washed with a sat. aq. NaHCO3 solution, dried (phase separator) and concentrated under reduced pressure. The crude residue was dissolved in THF (90 mL) and LiOH (2 M, 23.4 mL, 46.8 mmol) was added. The mixture was stirred at RT for 1 h, then was poured into a sat. aq. NaHCO3 solution and extracted with EtOAc. The aqueous layer was then extracted with CH2Cl2 (×2) and the combined organic layers were dried (phase separator) and concentrated. The residue was purified by normal phase chromatography (eluent: MeOH in CH2Cl2 from 0 to 15%) to give fraction A containing the first eluting isomer and fraction B containing the second eluting isomer. Fraction B was purified again by reverse phase chromatography (eluent A: H2O+0.1% TFA, B: CH3CN, gradient: 10% to 100%, flow: 150 mL/min) to give after extraction with a sat. aq. solution of NaHCO3 and CH2Cl2, evaporation of volatils and lyophilization from a mixture of CH3CN and water, Example 243b as the second eluting isomer (white solid): 1H NMR (400 MHz, DMSO-d6) δ 13.2 (s, 1H), 7.79 (s, 1H), 7.63 (s, 1H), 6.31 (m, 1H), 6.10 (m, 1H), 5.67 (m, 1H), 4.76 (m, 1H), 4.50 (t, 2H), 4.39 (t, 2H), 4.34 (s, 1H), 4.29 (s, 1H), 4.05 (s, 1H), 4.00 (s, 1H), 3.34 (m, 1H), 3.17 (m, 1H), 2.79 (m, 1H), 2.78-2.63 (m, 4H), 2.36-2.12 (m, 8H), 2.01 (s, 3H), 1.96-1.89 (m, 2H), 1.76 (m, 1H), 1.53 (m, 1H), 1.34 (m, 1H), 1.12 (s, 3H), 0.72 (s, 1.5H), 0.70 (s, 1.5H), 0.72-0.66 (m, 1H), 0.60 (m, 1H). UPLC-MS-2e: Rt=3.86 min; MS m/z [M+H]+ 681.3/683.3/685.3. Fraction A was purified again by normal phase chromatography (eluent: MeOH in CH2Cl2 from 0 to 16%) to give after lyophilization (CH3CN/water), Example 243a as the first eluting isomer (white solid): UPLC-MS-2e: Rt=3.54 min; MS m/z [M+H]+ 681.3/683.3/685.3.
Method-13a: similar to Method-13 except that Step 1 was performed in MeOH instead of ClCH2CH2Cl.
Method-13b: similar to Method-13 except that Step 3 was performed using chloro(crotyl)(tri-tert-butylphosphine)Pd(II) (CAS [1334497-00-5]) as a catalyst in dioxane as solvent.
Method-13c: similar to Method-13 except that Step 3 was performed using 0.2 eq. of cataCXium-A-Pd-G3 (CAS [1651823-59-4]) as catalyst, cyclopentylmethyl ether (138 mg, 0,190 mmol) as solvent and 3 eq. of aq. KOH (1 M) as base at 60° C.
Method-13d: similar to Method-13 except that Step 5 was performed using acryloyl chloride and NaHCO3 as described in Method-8 Step 3.
Method-13e: similar to Method-13 except that Step 2 was performed in THF instead of CH3CN.
Method-13f: similar to Method-13 except that Step 3 was performed in dioxane instead of toluene.
The following examples 244a to 320b were prepared using analogous methods to Method-13 from intermediates (in Step 1, 2 or 3) described in the intermediates synthesis section or commercially available. When the final separation of isomers is performed by preparative HPLC using acidic conditions the purified fractions were extracted with a sat. aq. NaHCO3 solution before lyophilization from a mixture of CH3CN/H2O to give the title compound as a free base.
(R)-1-(6-(4-(6-chloro-5- methyl-1H-indazol-4-yl)-3- (2,2-dimethyl-4-((4-(oxetan- 3-yl)piperazin-1- yl)methyl)piperidin-1-yl)-5- methyl-1H-pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
(R)-1-(6-(4-(5-chloro-6- fluoro-1H-indazol-4-yl)-3- (2,2-dimethyl-4-((4-(oxetan- 3-yl)piperazin-1- yl)methyl)piperidin-1-yl)-5- methyl-1H-pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
(R)-1-(6-(4-(5-chloro-6- methyl-1H-indazol-4-yl)-3- (2,2-dimethyl-4-((4-(oxetan- 3-yl)piperazin-1- yl)methyl)piperidin-1-yl)-5- methyl-1H-pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
1-(6-(4-(5,6-dichloro-1H- indazol-4-yl)-3-((R)-4-(((R)-2- (hydroxymethyl)morpholino) methyl)-2,2- dimethylpiperidin-1-yl)-5- methyl-1H-pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
(R)-1-(6-(4-(5,6-dichloro-1H- indazol-4-yl)-3-(4-((2,2- dioxido-2-thia-6- azaspiro[3.3]heptan-6- yl)methyl)-2,2- dimethylpiperidin-1-yl)-5- methyl-1H-pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
1-(6-(4-(5,6-dichloro-1H- indazol-4-yl)-3-((R)-4- (((1S,4S)-2,2-dioxido-2-thia- 5-azabicyclo[2.2.1]heptan-5- yl)methyl)-2,2- dimethylpiperidin-1-yl)-5- methyl-1H-pyrazol-1-yl)-2- azaspiro [3.3]heptan-2- yl)prop-2-en-1-one
(R)-1-(6-(4-(5,6-dichloro-1H- indazol-4-yl)-3-(4-((5,6- dihydro-[1,2,4]triazolo[4,3- alpyrazin-7(8H)-yl)methyl)- 2,2-dimethylpiperidin-1-yl)-5- methyl-1H-pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
(R)-4-((1-(1-(2-acryloyl-2- azaspiro[3.3]heptan-6-yl)-4- (5,6-dichloro-1H-indazol-4- yl)-5-methyl-1H-pyrazol-3- yl)-2,2-dimethylpiperidin-4- yl)methyl)-1-(2- hydroxyethyl)piperazin-2-one
(R)-1-(6-(4-(5,6-dichloro-1H- indazol-4-yl)-3-(2,2-dimethyl- 4-((methyl(2-oxo-2- (pyrrolidin-1- yl)ethyl)amino)methyl)piperidin- 1-yl)-5-methyl-1H-pyrazol- 1-yl)-2-azaspiro[3.3]heptan- 2-yl)prop-2-en-1-one
(R)-1-(6-(4-(5,6-dichloro-1H- indazol-4-yl)-3-(4-(((2- hydroxyethyl)(2- methoxyethyl)amino)methyl)- 2,2-dimethylpiperidin-1-yl)-5- methyl-1H-pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
(R)-1-(6-(4-(5,6-dichloro-1H- indazol-4-yl)-3-(4-((6,6- dioxido-6-thia-2- azaspiro[3.4]octan-2- yl)methyl)-2,2- dimethylpiperidin-1-yl)-5- methyl-1H-pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
(R)-1-(6-(4-(5-chloro-1H- indazol-4-yl)-3-(2,2-dimethyl- 4-((4-(oxetan-3-yl)piperazin- 1-yl)methyl)piperidin-1-yl)-5- methyl-1H-pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
(R)-4-((1-(1-(2-acryloyl-2- azaspiro[3.3]heptan-6-yl)-4- (5,6-dichloro-1H-indazol-4- yl)-5-methyl-1H-pyrazol-3- yl)-2,2-dimethylpiperidin-4- yl)methyl)-1-(2- methoxyethyl)piperazin-2- one
1-(6-(4-(5,6-dichloro-1H- indazol-4-yl)-3-((4R)-4-((1- hydroxy-3- azabicyclo[3.1.0]hexan-3- yl)methyl)-2,2- dimethylpiperidin-1-yl)-5- methyl-1H-pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
1-(6-(4-(5,6-dichloro-1H- indazol-4-yl)-3-((4R)-4-((1- hydroxy-3- azabicyclo[3.1.0]hexan-3- yl)methyl)-2,2- dimethylpiperidin-1-yl)-5- methyl-1H-pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
1-(6-(4-(5,6-dichloro-1H- indazol-4-yl)-3-((R)-2,2- dimethyl-4-(((4aR*,7aS*)-4- methylhexahydropyrrolo[3,4- b][1,4]oxazin-6(2H)- yl)methyl)piperidin-1-yl)-5- methyl-1H-pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
1-(6-(4-(5,6-dichloro-1H- indazol-4-yl)-3-((R)-2,2- dimethyl-4-(((4aR*,7aS*)-4- methylhexahydropyrrolo[3,4- b][1,4]oxazin-6(2H)- yl)methyl)piperidin-1-yl)-5- methyl-1H-pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
(4aR*,7aR*)-1-(((R)-1-(1-(2- acryloyl-2- azaspiro[3.3]heptan-6-yl)-4- (5,6-dichloro-1H-indazol-4- yl)-5-methyl-1H-pyrazol-3- yl)-2,2-dimethylpiperidin-4- yl)methyl)-6- methyloctahydro-7H- pyrrolo[3,4-b]pyridin-7-one
(4aR*,7aR*)-1-(((R)-1-(1-(2- acryloyl-2- azaspiro[3.3]heptan-6-yl)-4- (5,6-dichloro-1H-indazol-4- yl)-5-methyl-1H-pyrazol-3- yl)-2,2-dimethylpiperidin-4- yl)methyl)-6- methyloctahydro-7H- pyrrolo[3,4-b]pyridin-7-one
7-(((R)-1-(1-(2-acryloyl-2- azaspiro[3.3]heptan-6-yl)-4- (5,6-dichloro-1H-indazol-4- yl)-5-methyl-1H-pyrazol-3- yl)-2,2-dimethylpiperidin-4- yl)methyl)-2- methylhexahydroimidazo[1,5- a]pyrazin-3(2H)-one
7-(((R)-1-(1-(2-acryloyl-2- azaspiro[3.3]heptan-6-yl)-4- (5,6-dichloro-1H-indazol-4- yl)-5-methyl-1H-pyrazol-3- yl)-2,2-dimethylpiperidin-4- yl)methyl)-2- methylhexahydroimidazo[1,5- a]pyrazin-3(2H)-one
1-(6-(4-(5,6-dichloro-1H- indazol-4-yl)-3-((R)-4- (((4aR*,7aS*)-6,6- dioxidohexahydro-4H- thieno[3,4-b][1,4]oxazin-4- yl)methyl)-2,2- dimethylpiperidin-1-yl)-5- methyl-1H-pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
1-(6-(4-(5,6-dichloro-1H- indazol-4-yl)-3-((R)-4- (((4aR*,7aS*)-6,6- dioxidohexahydro-4H- thieno[3,4-b][1,4]oxazin-4- yl)methyl)-2,2- dimethylpiperidin-1-yl)-5- methyl-1H-pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
(R)-1-(6-(4-(5,6-dichloro-1H- indazol-4-yl)-3-(2,2-dimethyl- 4-((6-(oxetan-3-yl)-2,6- diazaspiro[3.4]octan-2- yl)methyl)piperidin-1-yl)-5- methyl-1H-pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
(R)-1-(6-(3-(4-((6-acetyl-2,6- diazaspiro[3.4]octan-2- yl)methyl)-2,2- dimethylpiperidin-1-yl)-4- (5,6-dichloro-1H-indazol-4- yl)-5-methyl-1H-pyrazol-1- yl)-2-azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
(R)-1-(6-(4-(5,6-dichloro-1H- indazol-4-yl)-3-(2,2-dimethyl- 4-((4-methyl-4-oxido-1,4- azaphosphinan-1- yl)methyl)piperidin-1-yl)-5- methyl-1H-pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
1-(6-(4-(5,6-dichloro-1H- indazol-4-yl)-3-((R)-4-(((S)-3- (hydroxymethyl)-4- methylpiperazin-1-yl)methyl)- 2,2-dimethylpiperidin-1-yl)-5- methyl-1H-pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
(R)-4-(((R)-1-(1-(2-acryloyl- 2-azaspiro[3.3]heptan-6-yl)- 4-(5,6-dichloro-1H-indazol-4- yl)-5-methyl-1H-pyrazol-3- yl)-2,2-dimethylpiperidin-4- yl)methyl)morpholine-2- carboxamide
(R)-1-(6-(4-(5,6-dichloro-1H- indazol-4-yl)-3-(2,2-dimethyl- 4-((5-(oxetan-3-yl)-2,5- diazaspiro[3.4]octan-2- yl)methyl)piperidin-1-yl)-5- methyl-1H-pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
1-(6-(4-(5,6-dichloro-1H- indazol-4-yl)-3-((R)-4- (((3S*,4S*)-3-hydroxy-4- methoxypyrrolidin-1- yl)methyl)-2,2- dimethylpiperidin-1-yl)-5- methyl-1H-pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
1-(6-(4-(5,6-dichloro-1H- indazol-4-yl)-3-((R)-4- (((3S*,4S*)-3-hydroxy-4- methoxypyrrolidin-1- yl)methyl)-2,2- dimethylpiperidin-1-yl)-5- methyl-1H-pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
(S)-8-(((R)-1-(1-(2-acryloyl-2- azaspiro[3.3]heptan-6-yl)-4- (5,6-dichloro-1H-indazol-4- yl)-5-methyl-1H-pyrazol-3- yl)-2,2-dimethylpiperidin-4- yl)methyl)hexahydropyrazino [2, 1-c][1,4]oxazin-4(3H)-one
(R)-1-(6-(3-(4-((2-acetyl-2,5- diazaspiro[3.4]octan-5- yl)methyl)-2,2- dimethylpiperidin-1-yl)-4- (5,6-dichloro-1H-indazol-4- yl)-5-methyl-1H-pyrazol-1- yl)-2-azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
1-(6-(4-(5,6-dichloro-1H- indazol-4-yl)-3-((R)-2,2- dimethyl-4-(((1S*,5S*)-2- (oxetan-3-yl)-2,6- diazabicyclo[3.2.0]heptan-6- yl)methyl)piperidin-1-yl)-5- methyl-1H-pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
1-(6-(4-(5,6-dichloro-1H- indazol-4-yl)-3-((R)-2,2- dimethyl-4-(((1S*,5S*)-2- (oxetan-3-yl)-2,6- diazabicyclo[3.2.0]heptan-6- yl)methyl)piperidin-1-yl)-5- methyl-1H-pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
1-(6-(4-(5,6-dichloro-1H- indazol-4-yl)-3-((R)-4-(((S)- hexahydropyrazino[2,1- c][1,4]oxazin-8(1H)- yl)methyl)-2,2- dimethylpiperidin-1-yl)-5- methyl-1H-pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
1-(6-(4-(5,6-dichloro-1H- indazol-4-yl)-3-((R)-2,2- dimethyl-4-(((4aS*,7aR*)-4- (oxetan-3- yl)hexahydrofuro[3,4- b]pyrazin-1(2H)- yl)methyl)piperidin-1-yl)-5- methyl-1H-pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
1-(6-(4-(5,6-dichloro-1H- indazol-4-yl)-3-((R)-2,2- dimethyl-4-(((4aS*,7aR*)-4- (oxetan-3- yl)hexahydrofuro[3,4- b]pyrazin-1(2H)- yl)methyl)piperidin-1-yl)-5- methyl-1H-pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
(R)-1-(6-(3-(4-((di(oxetan-3- yl)amino)methyl)-2,2- dimethylpiperidin-1-yl)-4- (5,6-dichloro-1H-indazol-4- yl)-5-methyl-1H-pyrazol-1- yl)-2-azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
(R)-1-(6-(4-(5,6-dichloro-1H- indazol-4-yl)-3-(2,2-dimethyl- 4-((morpholino- d8)methyl)piperidin-1-yl)-5- methyl-1H-pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
(R)-2-((1-(1-(2-acryloyl-2- azaspiro[3.3]heptan-6-yl)-4- (5,6-dichloro-1H-indazol-4- yl)-5-methyl-1H-pyrazol-3- yl)-2,2-dimethylpiperidin-4- yl)methyl)-7-methyl-5-oxa- 2,7-diazaspiro[3.4]octan-6- one
(R)-1-(6-(3-(4-((5-acetyl-2,5- diazaspiro[3.4]octan-2- yl)methyl)-2,2- dimethylpiperidin-1-yl)-4- (5,6-dichloro-1H-indazol-4- yl)-5-methyl-1H-pyrazol-1- yl)-2-azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
1-(6-(4-(5,6-dichloro-1H- indazol-4-yl)-3-((R)-4- (((2S,4R)-4-hydroxy-2- (methoxymethyl)pyrrolidin-1- yl)methyl)-2,2- dimethylpiperidin-1-yl)-5- methyl-1H-pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
1-(6-(4-(5,6-dichloro-1H- indazol-4-yl)-3-((R)-4- (((7S,8aR)-7- hydroxyhexahydropyrrolo[1,2- a]pyrazin-2(1H)-yl)methyl)- 2,2-dimethylpiperidin-1-yl)-5- methyl-1H-pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
1-(6-(4-(5,6-dichloro-1H- indazol-4-yl)-3-((R)-4-(((R)- hexahydropyrazino[2,1- c][1,4]oxazin-8(1H)- yl)methyl)-2,2- dimethylpiperidin-1-yl)-5- methyl-1H-pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
(R)-4-((1-(1-(2-acryloyl-2- azaspiro[3.3]heptan-6-yl)-4- (5,6-dichloro-1H-indazol-4- yl)-5-methyl-1H-pyrazol-3- yl)-2,2-dimethylpiperidin-4- yl)methyl)-N- methylpiperazine-1- carboxamide
1-(6-(4-(5,6-dichloro-1H- indazol-4-yl)-3-((R)-4-(((R)-2- (hydroxymethyl)-4-(oxetan-3- yl)piperazin-1-yl)methyl)-2,2- dimethylpiperidin-1-yl)-5- methyl-1H-pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
(R)-1-(6-(4-(5,6-dichloro-1H- indazol-4-yl)-3-(2,2-dimethyl- 4-((5-methyl-8-oxa-2,5- diazaspiro[3.5]nonan-2- yl)methyl)piperidin-1-yl)-5- methyl-1H-pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
1-(6-(4-(5,6-dichloro-1H- indazol-4-yl)-3-((R)-4-(((S)-6- hydroxy-1,4-oxazepan-4- yl)methyl)-2,2- dimethylpiperidin-1-yl)-5- methyl-1H-pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
(R)-1-(6-(4-(5,6-dichloro-1H- indazol-4-yl)-3-(4-((4- hydroxy-2- azabicyclo[2.1.1]hexan-2- yl)methyl)-2,2- dimethylpiperidin-1-yl)-5- methyl-1H-pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
1-(6-(4-(5,6-dichloro-1H- indazol-4-yl)-3-((R)-4- (((3aR,6aS)-2,2- dioxidotetrahydro-1H- thieno[3,4-c]pyrrol-5(3H)- yl)methyl)-2,2- dimethylpiperidin-1-yl)-5- methyl-1H-pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
1-(6-(3-((R)-4-(((3aR,6aS)-5- acetylhexahydropyrrolo[3,4- c]pyrrol-2(1H)-yl)methyl)-2,2- dimethylpiperidin-1-yl)-4- (5,6-dichloro-1H-indazol-4- yl)-5-methyl-1H-pyrazol-1- yl)-2-azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
(R)-2-((1-(1-(2-acryloyl-2- azaspiro[3.3]heptan-6-yl)-4- (5,6-dichloro-1H-indazol-4- yl)-5-methyl-1H-pyrazol-3- yl)-2,2-dimethylpiperidin-4- yl)methyl)-5,7-dimethyl- 2,5,7-triazaspiro[3.4]octan-6- one
(R)-1-(6-(4-(5,6-dichloro-1H- indazol-4-yl)-3-(2,2-dimethyl- 4-((6-(methylsulfonyl)-2,6- diazaspiro[3.4]octan-2- yl)methyl)piperidin-1-yl)-5- methyl-1H-pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
(R)-1-(6-(4-(5,6-dichloro-1H- indazol-4-yl)-3-(2,2-dimethyl- 4-((4- (methylsulfonyl)piperazin-1- yl)methyl)piperidin-1-yl)-5- methyl-1H-pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
(R)-1-(6-(3-(4-((2,5-dioxa-8- azaspiro[3.5]nonan-8- yl)methyl)-2,2- dimethylpiperidin-1-yl)-4-(5- chloro-6-methyl-1H-indazol- 4-yl)-5-methyl-1H-pyrazol-1- yl)-2-azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
1-(6-(4-(5,6-dichloro-1H- indazol-4-yl)-3-((R)-4- (((3R*,5R*)-3-fluoro-5- hydroxypiperidin-1- yl)methyl)-2,2- dimethylpiperidin-1-yl)-5- methyl-1H-pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
1-(6-(3-((4R)-4-((6-acetyl- 3,6- diazabicyclo[3.1.1]heptan-3- yl)methyl)-2,2- dimethylpiperidin-1-yl)-4- (5,6-dichloro-1H-indazol-4- yl)-5-methyl-1H-pyrazol-1- yl)-2-azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
(R)-1-(6-(3-(4-((2,8-dioxa-5- azaspiro[3.5]nonan-5- yl)methyl)-2,2- dimethylpiperidin-1-yl)-4-(6- chloro-5-methyl-1H-indazol- 4-yl)-5-methyl-1H-pyrazol-1- yl)-2-azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
1-(6-(4-(5,6-dichloro-1H- indazol-4-yl)-3-((R)-4-(((S)-3- (hydroxymethyl)morpholino) methyl)-2,2- dimethylpiperidin-1-yl)-5- methyl-1H-pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
(R)-N-((1-(1-(2-acryloyl-2- azaspiro[3.3]heptan-6-yl)-4- (5,6-dichloro-1H-indazol-4- yl)-5-methyl-1H-pyrazol-3- yl)-2,2-dimethylpiperidin-4- yl)methyl)-N,4- dimethylpiperazine-1- sulfonamide
1-(6-(4-(6-chloro-5-methyl- 1H-indazol-4-yl)-3-((R)-4- (((3aR*,6aR*)-hexahydro- 1H-furo[3,4-b]pyrrol-1- yl)methyl)-2,2- dimethylpiperidin-1-yl)-5- methyl-1H-pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
1-(6-(4-(6-chloro-5-methyl- 1H-indazol-4-yl)-3-((R)-4- (((3aR*,6aR*)-hexahydro- 1H-furo[3,4-b]pyrrol-1- yl)methyl)-2,2- dimethylpiperidin-1-yl)-5- methyl-1H-pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
(R)-1-(6-(3-(4-((6-oxa-1- azaspiro[3.3]heptan-1- yl)methyl)-2,2- dimethylpiperidin-1-yl)-4- (5,6-dichloro-1H-indazol-4- yl)-5-methyl-1H-pyrazol-1- yl)-2-azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
1-(6-(3-((4R)-4-((3,9-dioxa-7- azabicyclo[3.3.1]nonan-7- yl)methyl)-2,2- dimethylpiperidin-1-yl)-4- (5,6-dichloro-1H-indazol-4- yl)-5-methyl-1H-pyrazol-1- yl)-2-azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
(R)-1-(6-(3-(4-((4- acetylpiperazin-1-yl)methyl)- 2,2-dimethylpiperidin-1-yl)-4- (5-chloro-6-methyl-1H- indazol-4-yl)-5-methyl-1H- pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
(R)-1-(6-(4-(5,6-dichloro-1H- indazol-4-yl)-3-(4-((4-(2- hydroxyacetyl)piperazin-1- yl)methyl)-2,2- dimethylpiperidin-1-yl)-5- methyl-1H-pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
(R)-1-(6-(3-(4-((2-acetyl-5- oxa-2,8- diazaspiro[3.5]nonan-8- yl)methyl)-2,2- dimethylpiperidin-1-yl)-4- (5,6-dichloro-1H-indazol-4- yl)-5-methyl-1H-pyrazol-1- yl)-2-azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
(S)-7-(((R)-1-(1-(2-acryloyl-2- azaspiro[3.3]heptan-6-yl)-4- (5,6-dichloro-1H-indazol-4- yl)-5-methyl-1H-pyrazol-3- yl)-2,2-dimethylpiperidin-4- yl)methyl)hexahydro-3H- oxazolo[3,4-a]pyrazin-3-one
(S)-1-(((R)-1-(1-(2-acryloyl-2- azaspiro[3.3]heptan-6-yl)-4- (5,6-dichloro-1H-indazol-4- yl)-5-methyl-1H-pyrazol-3- yl)-2,2-dimethylpiperidin-4- yl)methyl)-N,N- dimethylpyrrolidine-2- carboxamide
1-(6-(3-((4R)-4-((8-oxa-3- azabicyclo[3.2.1]octan-3- yl)methyl)-2,2- dimethylpiperidin-1-yl)-4- (5,6-dichloro-1H-indazol-4- yl)-5-methyl-1H-pyrazol-1- yl)-2-azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
(R)-1-(6-(3-(4-((4-acetyl-1,4- diazepan-1-yl)methyl)-2,2- dimethylpiperidin-1-yl)-4- (5,6-dichloro-1H-indazol-4- yl)-5-methyl-1H-pyrazol-1- yl)-2-azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
(R)-1-(6-(3-(4-((6-oxa-2- azaspiro[3.4]octan-2- yl)methyl)-2,2- dimethylpiperidin-1-yl)-4- (5,6-dichloro-1H-indazol-4- yl)-5-methyl-1H-pyrazol-1- yl)-2-azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
(R)-1-(6-(3-(4-((2-acetyl-2,6- diazaspiro[3.4]octan-6- yl)methyl)-2,2- dimethylpiperidin-1-yl)-4- (5,6-dichloro-1H-indazol-4- yl)-5-methyl-1H-pyrazol-1- yl)-2-azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
1-(6-(3-((4R)-4-((3-acetyl- 3,8-diazabicyclo[3.2.1]octan- 8-yl)methyl)-2,2- dimethylpiperidin-1-yl)-4- (5,6-dichloro-1H-indazol-4- yl)-5-methyl-1H-pyrazol-1- yl)-2-azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
(R)-1-(6-(3-(4-((4- acetylpiperazin-1-yl)methyl)- 2,2-dimethylpiperidin-1-yl)-4- (5,6-dichloro-1H-indazol-4- yl)-5-methyl-1H-pyrazol-1- yl)-2-azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
1-(6-(4-(5,6-dichloro-1H- indazol-4-yl)-3-((R)-4-(((R)-2- (methoxymethyl)-4-(oxetan- 3-yl)piperazin-1-yl)methyl)- 2,2-dimethylpiperidin-1-yl)-5- methyl-1H-pyrazol-1-yl)-2- azaspiro[3.3]heptan-2- yl)prop-2-en-1-one
In an ace tube, to a colorless solution of tert-butyl 5,8-diazaspiro[3.5]nonane-5-carboxylate (4 g, 17.67 mmol) and oxetan-3-one (1.70 mL, 26.5 mmol) in dichloethane (70 mL) was added sodium triacetoxyborohydride (5.99 g, 28.3 mmol). The reaction mixture was stirred at RT for 3.5 days. The reaction mixture was poured into an aq. sat. NaHCO3 solution and extracted with CH2Cl2 (×2). The combined organic layers were dried (phase separator) and concentrated to give the title compound as a brown oil (5.19 g). MS m/z [M+H]+ 283.3; MS 1.
Tert-butyl 8-(oxetan-3-yl)-5,8-diazaspiro[3.5]nonane-5-carboxylate (Step 1, 2.02 g, 6.87 mmol) was dissolved in CH2Cl2 (25 mL). TFA was added (5.29 mL, 68.7 mmol) and the solution was stirred at RT for 2.5 h. The reaction mixture was concentrated and to the crude residue dissolved in MeOH (50 mL) was added MP-carbonate (loading: 3.03 mmol/g, 10 eq, 68.7 mmol, 22.7 g). The mixture was shaked at RT for 1 h and filtered, washed with MeOH and the filtrate was concentrated under reduced pressure to give the title compound as a TFA salt as a light brown foam (1.97 g) which was used without further purification in the next step. MS m/z [M+H]+ 183.2; MS 1.
Method-A1a: Similar to Method-A1 except that the final compound was further purified on basic alumina (eluent: MeOH in CH2Cl2) to obtain the free base.
The following intermediates A2 to A6 were prepared using analogous methods from commercially available reagents.
NaBH(OAc)3 (6.16 g, 29.1 mmol) was added under Ar atmosphere at 0° C. to a solution of (R)-(1-benzylpiperazin-2-yl)methanol (2.00 g, 9.70 mmol) and oxetan-3-one (0.93 mL, 14.5 mmol) in dichloroethane (40 mL). The reaction mixture was stirred at RT for 2 h. Then, the RM was poured into an aq. sat. NaHCO3 solution and was extracted with CH2Cl2 (×3). The combined organic layer was dried (phase separator) and evaporated. The crude residue was purified by normal phase chromatography on basic alumina (eluent: MeOH in CH2Cl2 from 0 to 3%) to give the title product. UPLC-MS-4: Rt=0.12 min; MS m/z [M+H]+ 263.3.
A solution of (R)-(1-benzyl-4-(oxetan-3-yl)piperazin-2-yl)methanol (2.20 g, 8.39 mmol), Pd/C (10%, 660 mg, 0.62 mmol) in EtOAc (84 mL) and AcOH (4.80 mL, 84 mmol) was placed under hydrogen atmosphere and stirred for 23 h. The reaction mixture was filtered over a pad of celite and washed with EtOAc. The filtrate was concentrated and the residue was diluted in MeOH (100 mL). MP-carbonate (100 mmol, 34.7 g) was added and the mixture was swirled at 40° C. for 1 h. The mixture was filtered, washed with MeOH and the filtrate was concentrated under reduced pressure. The crude residue was purified by normal phase chromatography on basic alumina (eluent: MeOH in CH2Cl2 from 0 to 10%). UPLC-MS-4: Rt=0.12 min; MS m/z [M+H]+ 173.2.
A solution of formaldehyde (37-41% aqueous, 296 mg, 3.94 mmol) and tert-butyl-8-oxa-2,5-diazaspiro[3.5]nonane-2-carboxylate (CAS [1251002-01-3], 900 mg, 3.94 mmol) in dichloroethane (24.3 mL) was stirred at 0° C. for 10 min. Then, NaBH(OAc)3 (1.25 g, 5.91 mmol) was added and the reaction mixture was stirred at 25° C. for 16 h. The RM was poured into a sat. aq. NaHCO3 solution and extracted with CH2Cl2 (2×). The combined organic layer was dried (phase separator) and concentrated to give the title compound which was used without purification in the next step. UPLC-MS-4: Rt=0.44 min; MS m/z [M+H]+ 243.3.
Tert-butyl 5-methyl-8-oxa-2,5-diazaspiro[3.5]nonane-2-carboxylate (Step 1, 607 mg, 2.51 mmol) was diluted in CH2Cl2 (15 mL) and TFA (1.93 mL, 25.1 mmol) was added. The reaction mixture was stirred at RT for 2 h. The RM was concentrated on the rotavap and under high vacuum. The crude residue was dissolved in MeOH (20 mL), MP-Carbonate (16.6 g, 50.1 mmol) was added and the mixture was stirred at 40° C. for 1 h, filtered, washed with MeOH and concentrated. The crude residue was purified by normal phase chromatography on basic alumina (eluent: MeOH in CH2Cl2 from 0 to 10%) to give the title compound. UPLC-MS-4: Rt=0.12 min; MS m/z [M+H]+ 143.3.
To a solution of tert-butyl 2,2-dimethyl-4-oxopiperidine-1-carboxylate (2.00 g, 8.80 mmol) in MeOH (20 mL) was added methanamine (2M in MeOH, 8.80 mL, 17.6 mmol) and acetic acid (0.50 mL, 8.80 mmol) and the reaction mixture was stirred at RT for 1 h under nitrogen atmosphere. Sodium triacetoxyborohydride (5.59 g, 26.4 mmol) was added and the RM was stirred at RT overnight. Water (30 mL) was added and the mixture was extracted with EtOAc (2×). The combined organic extracts were washed with water and the water layer was extracted with n-butanol (×2). The combined n-butanol layers were dried and concentrated under reduced pressure. The crude residue was used in the next step without purification. UPLC-MS-2a: Rt=0.66 min; MS m/z [M+H]+ 243.2.
To a solution of tert-butyl cis-2,6-dimethylpiperazine-1-carboxylate (1.12 g, 5.23 mmol) in CH2Cl2 (52.3 mL) at 0° C. under N2 atmosphere were added dropwise Et3N (1.82 mL, 13.1 mmol) followed by acetyl chloride (0.56 mL, 7.84 mmol) in CH2Cl2 (100 □L). The reaction mixture was stirred at 0° C. for 1 h. Then HCl (1N) was added, the layers were separated and the organic layer was neutralized with a sat. aq. NaHCO3 solution, dried (Na2SO4), filtered and evaporated to give the title compound as a yellow oil which was used without purification in the next step. UPLC-MS-2b: Rt=0.89 min; MS m/z [M+H]+ 257.
To a solution of tert-butyl (2R,6S)-4-acetyl-2,6-dimethylpiperazine-1-carboxylate (1.35 g, 5.27 mmol) in 1,4-dioxane (5.27 mL) was added HCl (4N in dioxane, 21 mL) and the reaction mixture was stirred at RT for 2 h. Then, the mixture was lyophilized, the residue was dissolved in MeOH (40 mL), MP-carbonate (21.1 mmol) was added and the mixture was swirled for 15 min, filtered and the residue was washed with MeOH. The filtrated was concentrated under reduced pressure to give the title compound as a yellow oil. UPLC-MS-2b: Rt=0.23 min; MS m/z [M+H]+ 157.
Method-A10a: similar to Method-A10 except that in Step 2 TFA was used in CH2Cl2 as described in Method-A1.
The following intermediates A1 to A26 were prepared using analogous methods to Method-10 from commercially available reagents.
1H NMR (400 MHZ, DMSO-d6) δ 7.52 (br s, 1H), 7.44 (br s, 1H), 4.23 (dd, 1H), 4.14-3.94 (m, 1H), 4.01 (m, 1H), 3.84 (td, 1H), 3.55 (d, 1H), 3.17 (d,
In an ACE tube, to a solution of tert-butyl 5,8-diazaspiro[3.5]nonane-5-carboxylate (2.00 g, 8.84 mmol) in CH3CN (60 mL) was added 2-bromoethyl methyl ether (1.33 mL, 14.1 mmol) and Et3N (3.67 mL, 26.5 mmol) and the reaction mixture was stirred at reflux for 5.5 h. After completion of the reaction, the reaction mixture was poured into an aq. sat. NaHCO3 solution and extracted with CH2Cl2 (×2). The combined organic extracts were dried (phase separator) and concentrated to give the title compound as a brown oil which was used without purification in the next step. MS-1: MS m/z [M+H]+ 285.4.
To a solution of tert-butyl 8-(2-methoxyethyl)-5,8-diazaspiro[3.5]nonane-5-carboxylate (Step 1, 2.58 g, 8.82 mmol) in 1,4-dioxane (9.0 mL) was added HCL (4N in dioxane, 22.0 mL, 88 mmol) and the reaction mixture was stirred at RT for 2 h. The RM was frozen and lyophilized to give the title compound as a hydrochloride salt (white solid). The material was dissolved in MeOH (60 mL), MP-carbonate (35.3 mmol, 11.65 g) was added and the mixture was swirled at RT for 30 min. The mixture was filtered, the precipitate was washed with MeOH and the filtrate was concentrated under reduced pressure to give the title compound as a brown oil. MS-1: MS m/z [M+H]+ 185.2.
Benzyl chloroformate (2.85 mL, 19.2 mmol) was added to a solution of 5,8-diazaspiro[3.5]nonan-7-one (CAS [1557629-00-1], 2.45 g, 17.5 mmol) and DIPEA (6.42 mL, 36.7 mmol) in CH2Cl2 (70 mL) at RT. After 2 h, the reaction mixture was diluted with a sat. aq. NaHCO3 solution and extracted with CH2Cl2 (2×). The combined organic layers were dried (Na2SO4) and concentrated. The crude residue was purified by normal phase chromatography (eluent: heptane/(20:1 EtOAc/MeOH), 0 to 100%) to give the title compound as a colorless oil. UPLC-MS-2a: Rt=0.90 min; MS m/z [M+H]+ 275.2.
NaH (95%, 83 mg, 3.30 mmol) was added to a solution of benzyl 7-oxo-5,8-diazaspiro[3.5]nonane-5-carboxylate (Step 1, 831 mg, 3.00 mmol) in DMF (15 mL) at 0° C. under nitrogen atmosphere. After stirring for 10 min, iodomethane (0.28 mL, 4.50 mmol) was added and the reaction was allowed to warm to RT. After 1 h, the mixture was diluted with a sat. aq. NaHCO3 solution and extracted with EtOAc (2×). The combined organic layers were washed with H2O/brine (9:1) and brine, dried (Na2SO4), filtered and concentrated. The crude residue was purified by normal phase chromatography (eluent: heptane/(20:1 EtOAc/MeOH), 0 to 100%) to give the title compound as a colorless oil. UPLC-MS-2a: Rt=0.93 min; MS m/z [M+H]+ 289.2.
A mixture of benzyl 8-methyl-7-oxo-5,8-diazaspiro[3.5]nonane-5-carboxylate (Step 2, 1.17 g, 3.85 mmol) and 10% Pd/C (205 mg) in EtOH (19 mL) was placed under a hydrogen atmosphere (ambient pressure) and stirred at RT for 90 min. The reaction mixture was filtered through a celite pad and washed with EtOH. The filtrate was concentrated to give the title compound which was used without purification in the next step. NMR (400 MHz, DMSO-d6) δ 3.23 (s, 2H), 3.18 (s, 2H), 2.80 (s, 3H), 2.66 (br s, 1H), 1.84-1.91 (m, 4H), 1.71-1.84 (m, 2H).
Benzyl chloroformate (1.44 mL, 9.60 mmol) was added to a solution of 5,8-diazaspiro[3.5]nonan-7-one (CAS [1246034-93-4], 1.91 g, 8.00 mmol) and K2CO3 (3.32 g, 24.0 mmol) in THF (40 mL) at RT. After 18 h, the reaction mixture was diluted with a sat. aq. NaHCO3 solution and extracted with EtOAc (2×). The combined organic layers were washed with brine, dried (Na2SO4), filtered and concentrated. The crude residue was purified by normal phase chromatography (eluent: heptane/(20:1 EtOAc/MeOH), 0 to 100%) to give the title compound as a colorless oil. UPLC-MS-2a: Rt=1.24 min; MS m/z [M+H]+ 361.2.
TFA (11.4 mL, 147 mmol) was added to a solution of 5-benzyl 2-(tert-butyl) 2,5-diazaspiro[3.5]nonane-2,5-dicarboxylate (Step 1, 2.95 g, 7.37 mmol) in CH2Cl2 (74 mL) at RT. After 2 h, the reaction mixture was concentrated. The residue was diluted with a sat. aq. NaHCO3 and extracted with EtOAc (4×). The combined organic layers were washed with brine, dried (Na2SO4), filtered and concentrated. The crude intermediate was dissolved in dioxane (37 mL) and H2O (37 mL), treated with K2CO3 (3.05 g, 22.1 mmol), stirred for 5 min and then acetic anhydride (0.70 mL, 7.37 mmol) was added to the reaction mixture. After 1 h, the mixture was diluted with a sat. aq. NaHCO3 and extracted with EtOAc (2×). The combined organic layers were washed with brine, dried (Na2SO4), filtered and concentrated. The crude residue was purified by normal phase chromatography (eluent: heptane/(20:1 EtOAc/MeOH), 0 to 100%) to give the title compound as a colorless oil. UPLC-MS-2a: Rt=0.93 min; MS m/z [M+H]+ 303.2.
A mixture of benzyl 2-acetyl-2,5-diazaspiro[3.5]nonane-5-carboxylate (Step 2, 350 mg, 1.04 mmol) and 10% Pd/C (111 mg) in EtOH (10 mL) was placed under a hydrogen atmosphere (ambient pressure) and stirred at RT for 90 min. The reaction mixture was filtered through a celite pad and washed with EtOH. The filtrate was concentrated to give the title compound which was used without purification in the next step. 1H NMR (400 MHz, DMSO-d6) δ 3.83 (m, 1H), 3.75 (m, 1H), 3.55 (m, 1H), 3.48 (m, 1H), 2.53-2.65 (m, 3H), 1.74 (s, 3H), 1.54 (m, 2H), 1.46 (m, 2H), 1.35 (m, 2H). c
A mixture of tert-butyl 5,8-diazaspiro[3.5]nonane-5-carboxylate (23.0 g, 102 mmol) and HCl (4M in 1,4-dioxane, 254 mL, 1016 mmol) was stirred at RT for 16 h. The reaction mixture was concentrated under vacuum to give the title compound as a hydrochloride salt (white solid) which was used without purification in the next step. 1H NMR (400 MHz, DMSO-d6) δ 10.14 (d, 4H), 3.47 (s, 2H), 3.27-3.18 (m, 4H), 2.43-2.19 (m, 4H), 1.96-1.81 (m, 2H).
Under inert atmosphere, to a stirred solution of 5,8-diazaspiro[3.5]nonane hydrochloride (Step 1, 102 mmol) in CH2Cl2 (400 mL) were added DIPEA (142 mL, 816 mmol) and 2,5-dioxopyrrolidin-1-yl (2-(trimethylsilyl)ethyl) carbonate (26.4 g, 102 mmol). The reaction mixture was stirred at RT for 16 h. The RM was quenched with a sat. aq. NaHCO3 solution and extracted with CH2Cl2 (×2). The combined organic layers were washed with a sat. aq. NaHCO3 solution, dried (Na2SO4), filtered and concentrated under vacuum. The crude residue was purified by normal phase chromatography (eluent: MeOH in CH2Cl2 0 to 10%) to give the title compound as a yellow oil. 1H NMR (400 MHz, DMSO-d6) δ 4.13-4.05 (m, 2H), 3.23 (s, 4H), 2.59-2.53 (m, 2H), 1.83-1.79 (m, 2H), 1.74-1.64 (m, 4H), 0.98-0.90 (m, 2H), 0.02 (s, 9H).
To a solution of benzyltriethylammonium chloride (212 mg, 0.93 mmol) in CH2Cl2 (50.0 mL) was added N-benzylethylenediamine (4.80 mL, 31.0 mmol) followed by chloroform (5.00 mL, 62.0 mmol) and cyclobutanone (4.68 mL, 62.0 mmol). The reaction mixture was cooled to 0° C. and 30% aqueous NaOH solution (25.0 mL, 313 mmol) was added dropwise. Then the reaction mixture was stirred at RT for 60 h. The RM was diluted with water and extracted twice with CH2Cl2. The combined organic layers were washed with brine, dried over Na2SO4, filtered, and concentrated under vacuum. The crude residue was purified by preparative HPLC (RP-HPLC-1: mobile phase: A: water+0.1% TFA, B: acetonitrile; gradient: 10 to 50% B in 25 min). Product containing fractions were combined, basified with a sat. aq. NaHCO3 solution, and extracted twice with EtOAc. The combined organic layers were washed with brine, dried (Na2SO4), filtered, and concentrated under vacuum to give the title compound as an oil. UPLC-MS-2a: Rt=0.58 min; MS m/z [M+H]+ 231.2.
Under inert atmosphere, to a solution of LiAlH4 (1M in THF, 19.0 mL, 19.0 mmol) in THF (60.0 mL) was added at RT a solution of 8-benzyl-5,8-diazaspiro[3.5]nonan-9-one (Step 1, 4.00 g, 16.5 mmol) in THF (40.0 mL) dropwise with stirring. The reaction mixture was stirred at RT for 20 h. The RM was diluted with THF (150 mL), water (0.72 mL) was added followed by NaOH (3.5M aq. solution, 0.72 mL) and then water (2.00 mL). The RM was stirred at RT for 15 min, dried (Na2SO4), filtered, and concentrated under vacuum. The crude residue was purified by normal phase chromatography (eluent: MeOH in CH2Cl2 0 to 10%) to give the title compound as an oil. UPLC-MS-2a: Rt=0.65 min; MS m/z [M+H]+ 217.2.
To an ice-cooled solution of benzyltriethylammonium chloride (14.7 g, 64.6 mmol) in CH2Cl2 (2.00 L) was added N-benzylethylenediamine (200 mL, 1.29 mol) followed by chloroform (208 mL, 2.58 mol), butan-2-one (231 mL, 2.58 mol) and 30% aqueous NaOH solution (1.03 L, 12.9 mol). Then the reaction mixture was warmed up to RT and stirred for 3 days. The RM was diluted with water and extracted twice with CH2Cl2. The combined organic layers were washed with brine, dried (MgSO4), filtered, and concentrated under vacuum. The residue was purified twice by normal phase chromatography (eluent: MeOH in CH2Cl2 0 to 7%) to give the enantiomeric mixture of the title compound as a pale yellow oil. The enantiomers were separated by chiral C-SFC-12 (mobile phase: CO2/[MeOH+0.025% NH3] 75/25) to give (S)-1-benzyl-3-ethyl-3-methylpiperazin-2-one as the first eluting enantiomer: (C-SFC-40 (mobile phase: 5 to 40% [IPA+0.05% DEA] in CO2): Rt=3.97 min); UPLC-MS-2a: Rt=0.55 min; MS m/z [M+H]+ 233.3 and (R)-1-benzyl-3-ethyl-3-methylpiperazin-2-one as the second eluting enantiomer: (C-SFC-40 (mobile phase: 5 to 40% [IPA+0.05% DEA] in CO2): Rt=4.18 min); UPLC-MS-2a: Rt=0.54 min; MS m/z [M+H]+ 233.3.
To LiAlH4 (2M in THF, 50.2 mL, 100 mmol) under a nitrogen atmosphere was added a solution of (S)-1-benzyl-3-ethyl-3-methylpiperazin-2-one (Step 1 first eluting enantiomer, 15.7 g, 66.9 mmol) in THF (335 mL) dropwise with stirring at RT (slightly exothermic (˜35° C.)). The reaction mixture was stirred at 60° C. for 2 h. The RM was slowly quenched by careful addition of water (2.00 mL) at 0° C. followed by 15% aqueous NaOH solution (2.00 mL) then water (6.00 mL). To the suspension was added Na2SO4, the mixture was filtered and washed with EtOAc. The combined organic layers were concentrated under vacuum and the residue was diluted with EtOAc and water and extracted with EtOAc (2×250 mL). The combined organic layers were washed with 1.5M aq. potassium sodium tartrate (Rochelle salt) then brine (100 mL), dried (Na2SO4), filtered, and concentrated under vacuum. The residue was purified by normal phase chromatography (eluent: MeOH in CH2Cl2 0 to 20%) to give the title compound as a yellow oil. UPLC-MS-2a: Rt=0.69 min; MS m/z [M+H]+ 219.3.
The title compound was prepared by a method similar to that of (S)-1-benzyl-3-ethyl-3-methylpiperazine (Intermediate A32) using (R)-1-benzyl-3-ethyl-3-methylpiperazin-2-one (Intermediate A32, Step 1 second eluting enantiomer) instead of (S)-1-benzyl-3-ethyl-3-methylpiperazin-2-one. UPLC-MS-4: Rt=0.38 min; MS m/z [M+H]+ 219.3.
To an ice-cooled solution of benzyl(triethyl)ammonium chloride (152 g, 666 mmol) in CH2Cl2 (10 L) was added N-benzylethylenediamine (1000 g, 6.66 mol), 1,1-difluoropropan-2-one (1.25 kg, 13.2 mol) followed by NaOH (13 M, 5.12 L) and finally CHCl3 (1.59 kg, 13.3 mol). The mixture was stirred at 15° C. for 18 h. The mixture was poured into water. The aqueous phase was extracted twice with CH2Cl2. The combined organic phases were washed with brine, dried (Na2SO4), filtered and concentrated in vacuum. The crude residue was purified by normal phase chromatography (eluent: Petroleum ether/Ethyl acetate; 100/1 to 10/1) to give the enantiomeric mixture of the title compound as a pale yellow gum. The enantiomers were separated by chiral C-SFC-41 (mobile phase: [MeOH+0.1% NH4OH] in CO2 35%) to give (S)-1-benzyl-3-(difluoromethyl)-3-methylpiperazin-2-one as the first eluting enantiomer: C-SFC-42 (mobile phase: [MeOH+0.05% DEA] in CO2 5 to 40%): Rt=1.58 min, UPLC-MS-2a: Rt=0.73 min; MS m/z [M+H]+ 255.2 and (R)-1-benzyl-3-(difluoromethyl)-3-methylpiperazin-2-one as the second eluting enantiomer: C-SFC-42 (mobile phase: [MeOH+0.05% DEA] in CO2 5 to 40%): Rt=2.04 min, UPLC-MS-2a: Rt=0.40 min; MS m/z [M+H]+ 255.2.
To an ice-cooled solution of (R)-1-benzyl-3-(difluoromethyl)-3-methylpiperazin-2-one (Step 1 second eluting enantiomer, 151 g, 595 mmol) in THF (900 mL) was added dropwise under inert atmosphere at 0° C. BH3-Me2S (10 M in THF, 595 mL). The mixture was stirred at 75° C. for 20 h. After completion, the reaction mixture was cooled to 0° C. and quenched by adding MeOH (600 ml) and HCl (4N, 400 mL) until pH 3. The reaction mixture was stirred at 50° C. for 12 h and was concentrated under reduced pressure. The solution was poured into ice-cooled mixture of 15% NaOH (600 mL) and CH2Cl2/MeOH (10/1) to adjust the pH around 14. The layers were separated, the aqueous layer was bac-extracted with CH2Cl2 and the combined organic phases were dried (Na2SO4), filtered and evaporated. The crude residue was purified by normal phase chromatography (eluent: Petroleum ether/EtOAc 100/1 to 20/1) to give the title compound as a yellow oil. UPLC-MS-4: Rt=0.40 min; MS m/z [M+H]+ 241.3.
The title compound was prepared by a method similar to that of (R)-1-benzyl-3-(difluoromethyl)-3-methylpiperazine (Intermediate A34) using (S)-1-benzyl-3-(difluoromethyl)-3-methylpiperazin-2-one (Intermediate A34, Step 1 first eluting enantiomer) instead of (R)-1-benzyl-3-(difluoromethyl)-3-methylpiperazin-2-one. UPLC-MS-4: Rt=0.42 min; MS m/z [M+H]+; 241.2.
To an ice-cooled solution of benzyltriethylammonium chloride (0.63 g, 2.74 mmol) in CH2Cl2 (85 mL) were added N-benzylethylenediamine (8.50 mL, 54.9 mmol), 1,1-difluorobutan-2-one (53% in THF, 22.4 g, 110 mmol) followed by sodium hydroxide 30% (43.9 mL, 549 mmol) and finally chloroform (8.85 mL, 110 mmol). The mixture was stirred and allowed to slowly reach RT for 16 h. The mixture was diluted with water and extracted twice with CH2Cl2. The combined organic phase was washed with brine, dried (MgSO4), filtered and evaporated under reduced pressure to give the enantiomeric mixture of the title compound. The enantiomers were separated by chiral C-SFC-45 (mobile phase: 20% EtOH in CO2) to give (S)-1-benzyl-3-(difluoromethyl)-3-ethylpiperazin-2-one as the first eluting enantiomer: C-SFC-8 (mobile phase: CO2/[MeOH+0.025% NH3] 80/20): Rt=1.25 min, UPLC-MS-4: Rt=0.73 min; MS m/z [M+H]+ 269.3 and (R)-1-benzyl-3-(difluoromethyl)-3-methylpiperazin-2-one as the second eluting enantiomer: C-SFC-8 (mobile phase: CO2/[MeOH+0.025% NH3] 80/20): Rt=1.71 min, UPLC-MS-4: Rt=0.74 min; MS m/z [M+H]+ 269.1.
To a solution of (S)-1-benzyl-3-(difluoromethyl)-3-ethylpiperazin-2-one (Step 1 first eluting enantiomer, 2.00 g, 7.45 mmol) in THF (3.30 mL) was added BH3·THF (1M in THF, 74.5 mL, 74.5 mmol) at 0° C. The mixture was stirred at 0° C. for 15 min, at RT for 15 min and then at 75° C. for 48 h. After cooling to 0° C., the RM was quenched carefully with MeOH (30 mL) and HCl (4N, 20 mL) until pH 3. The mixture was stirred at 0° C. for 2 h and then was concentrated. The aqueous solution was poured into an ice-cooled mixture of 15% NaOH (16 mL) to reach pH 14. The aqueous phase was extracted with CH2Cl2/MeOH (9/1) (×3). The combined organic layer was dried (MgSO4), filtered and evaporated. The crude residue was purified by normal phase chromatography (eluent: TBME in n-heptane, 0 to 100%) to give the title compound. UPLC-MS-4: Rt=0.49 min; MS m/z [M+H]+ 255.3.
To an ice-cooled solution of benzyltriethylammonium chloride (7.76 g, 34.0 mmol) in CH2Cl2 (600 mL) was added N-benzylethylenediamine (102 mL, 0.68 mol), methoxyacetone (62.7 mL, 0.68 mol) followed by NaOH 30% (545 mL, 6.81 mol) and finally CHCl3 (110 mL, 1.36 mol). The reaction mixture was warmed up to RT and stirred for 18 h. The reaction mixture was diluted with water and extracted twice with CH2Cl2. The combined organic layers were washed with brine, dried (Na2SO4), filtered and concentrated under vacuum. The crude residue was purified by normal phase chromatography (eluent: MeOH in CH2Cl2 0 to 10%) to give the enantiomeric mixture of the title compound as a pale yellow oil. The enantiomers were separated by chiral C-HPLC-17 (mobile phase: CH3CN+0.2% NH3) to give (S)-1-benzyl-3-(methoxymethyl)-3-methylpiperazin-2-one as the first eluting enantiomer: C-HPLC-18 (mobile phase: CH3CN+0.2% NH3: Rt=4.49 min, UPLC-MS-4: Rt=0.25 min; MS m/z [M+H]+ 249.2 and (R)-1-benzyl-3-(methoxymethyl)-3-methylpiperazin-2-one as the second eluting enantiomer: C-HPLC-18 (mobile phase: CH3CN+0.2% NH3: Rt=6.18 min, UPLC-MS-4: Rt=0.25 min; MS m/z [M+H]+ 249.2.
To a solution of (S)-1-benzyl-3-(methoxymethyl)-3-methylpiperazin-2-one (Step 1 first eluting enantiomer, 41.5 g, 167 mmol) in THF (500 mL) was added LiAlH4 (2M in THF, 100 mL, 201 mmol) under a nitrogen atmosphere. The reaction mixture was stirred at 60° C. for 30 min. The reaction was slowly quenched by careful addition of Rochelle's salt (potassium sodium tartrate) and extracted with CH2Cl2 (×2). The combined organic extracts were washed with a sat. aq. NaHCO3 solution, dried (Na2SO4), filtered and concentrated under vacuum. The crude residue was purified by normal phase chromatography (eluent: MeOH in CH2Cl2 0 to 10%). The fractions containing the desired material were concentrated and the residue was purified again by normal phase chromatography (eluent: (MeOH/NH4OH 80/20) in CH2Cl2 0 to 10%) to give the title compound as a colorless oil. UPLC-MS-4: Rt=0.37 min; MS m/z [M+H]+ 235.3.
The title compound was prepared by a method similar to Step 2 of Intermediate A37 using racemic 1-benzyl-3-(methoxymethyl)-3-methylpiperazin-2-one (Intermediate A37 Step 1) instead of (S)-1-benzyl-3-(methoxymethyl)-3-methylpiperazin-2-one. UPLC-MS-4: Rt=0.37 min; MS m/z [M+H]+ 235.3.
To an ice-cooled solution of benzyltriethylammonium chloride (0.58 g, 2.53 mmol) in CH2Cl2 (50 mL) was added N-benzylethylenediamine (7.60 mL, 50.6 mmol), NaOH 30% (40.5 mL, 506 mmol) and 4-methoxy-2-butanone (5.17 g, 50.6 mmol) followed by CHCl3 (8.16 mL, 101 mmol). The reaction mixture was warmed up to RT and stirred for 20 h. The RM was diluted with water and extracted twice with CH2Cl2. The combined organic layers were washed with brine, dried (Na2SO4), filtered and concentrated under vacuum. The crude residue was purified by normal phase chromatography (eluent: MeOH in CH2Cl2 0 to 8.3%) to give the enantiomeric mixture of the title compound as a pale yellow oil. The enantiomers were separated by chiral C-SFC-13 (mobile phase: [IPA+0.1% NH4OH] in CO2 35%) to give (S)-1-benzyl-3-(2-methoxyethyl)-3-methylpiperazin-2-one as the first eluting enantiomer: C-SFC-14 (mobile phase: [MeOH+0.05% DEA] in CO2 5 to 40%): Rt=5.17 min, UPLC-MS-4: Rt=0.25 min; MS m/z [M+H]+ 263.1 and (R)-1-benzyl-3-(2-methoxyethyl)-3-methylpiperazin-2-one as the second eluting enantiomer: C-SFC-14 (mobile phase: [MeOH+0.05% DEA] in CO2 5 to 40%): Rt=5.55 min, UPLC-MS-4: Rt=0.25 min; MS m/z [M+H]+ 263.1.
To a solution of (S)-1-benzyl-3-(2-methoxyethyl)-3-methylpiperazin-2-one (Step 1 first eluting enantiomer, 3.10 g, 11.8 mmol) in THF (50 mL) was added LiAlH4 (2M in THF, 11.8 mL, 23.6 mmol) under a nitrogen atmosphere. The reaction mixture was stirred at 60° C. for 1 h. The reaction was slowly quenched by careful addition of Rochelle's salt (potassium sodium tartrate) and extracted with CH2Cl2 (×2). The combined organic extracts were washed with a sat. aq. NaHCO3 solution, dried (Na2SO4), filtered and concentrated under vacuum. The crude residue was purified by normal phase chromatography (eluent: MeOH in CH2Cl2 0 to 10%) to give the title compound as a yellow oil. UPLC-MS-4: Rt=0.32 min; MS m/z [M+H]+ 249.9.
To a solution of tert-butyl (S)-(2-aminopropyl)carbamate hydrochloride (3.58 g, 17.0 mmol) in MeOH (150 mL) was added MP-carbonate (22.4 g, 17.0 mmol) and the mixture was stirred at 40° C. for 1 h. The mixture was filtered and the filtrate was concentrated in vacuo. The residue was dissolved in DCE (300 mL), benzaldehyde (1.66 mL, 16.4 mmol) was added and the mixture was stirred at RT for 1 h prior to the addition of sodium triacetoxyborohydride (6.93 g, 32.7 mmol) under nitrogen atmosphere. The reaction mixture was then stirred at RT overnight. The RM was quenched with a sat. aq. NaHCO3 solution and extracted with EtOAc. The combined organic layers were washed with brine, dried (Na2SO4), filtered and concentrated in vacuo. The crude residue was purified by normal phase chromatography (eluent: MeOH in CH2Cl2 0 to 20%) to give the title compound as a yellow oil. UPLC-MS-4: Rt=0.41 min; MS m/z [M+H]+ 265.2.
To a solution of tert-butyl (S)-(2-(benzylamino)propyl)carbamate (Step 1, 3.15 g, 8.35 mmol) was added HCl (4M in 1,4-dioxane, 12.5 mL, 50.1 mmol) at 0° C. and the reaction mixture was stirred at RT overnight. The solvent was evaporated and co-evaporated with CH2Cl2 (×2). The residue was dissolved in MeOH (100 mL) and MP-carbonate (25.0 g, 8.58 mmol) was added. The mixture was stirred at 40° C. for 1 h, filtered and the filtrate was concentrated in vacuo to give the title compound as a yellow oil. 1H NMR (400 MHz, DMSO-d6) δ 7.39-7.15 (m, 5H), 3.81-3.59 (m, 2H), 3.30 (br s, 1H), 3.17 (s, 1H), 2.58-2.36 (m, 2H), 2.01 (br s, 2H), 0.95 (d, 3H).
To a solution of N-benzyl-N,N-diethylethanaminium chloride (90.0 mg, 0.39 mmol) in CH2Cl2 (80 mL) were added (S)—N2-benzylpropane-1,2-diamine (Step 2, 1.30 g, 7.91 mmol), chloroform (1.28 mL, 15.8 mmol) and propan-2-one (1.17 mL, 15.8 mmol) followed by NaOH (30% aq. solution, 6.33 mL, 79 mmol) at 0° C. The reaction mixture was stirred at RT overnight. The RM was diluted with water, extracted with CH2Cl2 (×2) and the combined organic layers were washed with brine, dried (MgSO4), filtered and concentrated in vacuo. The crude residue was purified by normal phase chromatography (eluent: MeOH in CH2Cl2 0 to 20%) to give the title compound as a beige solid. UPLC-MS-4: Rt=0.28 min; MS m/z [M+H]+ 233.1.
To a solution of (S)-1-benzyl-3,3,6-trimethylpiperazin-2-one (Step 3, 760 mg, 2.94 mmol) in THF (15.0 mL) under a nitrogen atmosphere was added LiAlH4 (2M in THF, 4.42 mL, 8.83 mmol) dropwise at 0° C. The reaction mixture was slowly allowed to reach RT and stirred at RT for 3.5 h. The RM was diluted with CH2Cl2 and was quenched carefully by addition of NaOH (1M aqueous solution) at 0° C. The mixture was stirred until the organic layer became clear and the white precipitate was filtered off. The filtrate was extracted with CH2Cl2 and the combined organic layers were dried (Na2SO4), filtered and concentrated in vacuo to give the title compound as a colorless oil. UPLC-MS-4: Rt=0.45 min; MS m/z [M+H]+ 219.3.
To a stirred solution of 2,2-diethyl-piperazine dihydrochloride (1.00 g, 4.65 mmol) in CH2Cl2 (20 mL) under argon atmosphere at 0° C. was added DIPEA (4.06 mL, 23.2 mmol) and 1-[2-(trimethylsilyl)ethoxycarbonyl)pyrrolidin-2,5-dione (1.20 g, 4.65 mmol). The reaction mixture was stirred for 16 h at RT. The RM was quenched with a sat. aq. NaHCO3 solution, then extracted with CH2Cl2 (×2). The combined organic extracts were washed with brine, dried (Na2SO4), filtered and evaporated. The crude residue was purified by normal phase chromatography (eluent: MeOH in CH2Cl2 0 to 10%) to give the title compound as a colorless oil. 1H NMR (600 MHz, DMSO-d6) δ 4.08 (t, 2H), 3.24 (m, 2H), 3.08 (s, 2H), 2.62 (m, 2H), 1.85 (m, 1H), 1.37-1.18 (m, 4H), 0.93 (t, 2H), 0.74 (t, 6H), 0.02 (s, 9H).
The title compound was prepared by a method similar to that of 2-(trimethylsilyl)ethyl 3,3-diethylpiperazine-1-carboxylate (Intermediate A40) using 6,9-diazaspiro[4.5]decane instead of 2,2-diethyl-piperazine dihydrochloride. 1H NMR (600 MHz, DMSO-d6) δ 4.08 (t, 2H), 3.25 (m, 2H), 3.12 (s, 2H), 2.63 (m, 2H), 2.15 (m, 1H), 1.65-1.60 (m, 2H), 1.53-1.44 (m, 4H), 1.42-1.36 (m, 2H), 0.92 (t, 2H), 0.02 (s, 9H).
The title compound was prepared by a method similar to that of 2-(trimethylsilyl)ethyl 3,3-diethylpiperazine-1-carboxylate (Intermediate A40) using (4aS*,7aS*)-octahydrofuro[3,4-b]pyrazine (Princeton Biomolecular Research) instead of 2,2-diethyl-piperazine dihydrochloride. MS-1: MS m/z [M+H]+ 273.2.
The title compound was prepared by a method similar to that of 2-(trimethylsilyl)ethyl 3,3-diethylpiperazine-1-carboxylate (Intermediate A40) using 2,2-dimethyl-piperazine dihydrochloride. 1H NMR (600 MHz, DMSO-d6) δ 4.08 (t, 2H), 3.23 (m, 2H), 3.05 (s, 2H), 2.67 (m, 2H), 1.89 (br. s, 1H), 0.97 (s, 6H), 0.93 (t, 2H), 0.02 (s, 9H).
To an ice-cooled suspension of 3-aminotetrahydro-furan-3-carboxylic acid (4.75 g, 36.2 mmol) in MeOH (47.5 mL) under nitrogen atmosphere was added dropwise thionyl chloride (7.93 mL, 109 mmol) (EXOTHERMIC!) and the reaction mixture was stirred at RT for 16 h. The RM was concentrated under vacuum, co-evaporated with toluene (×2) and dried under high vacuum to give the title compound as an hydrochloride salt (beige solid). MS-1: MS m/z [M+H]+ 146.1.
To an ice-cooled, vigorously stirred biphasic solution of methyl 3-aminotetrahydrofuran-3-carboxylate (Step 1, 6.80 g, 36.1 mmol) in EtOAc (45 mL) and water (30 mL) was added potassium carbonate (15.0 g, 108 mmol), followed by 2-chloroacetyl chloride (3.74 mL, 47.0 mmol). The reaction mixture was stirred at RT for 17 h. The reaction mixture was poured into 10% citric acid, the layers were separated and the aqueous layer was back extracted with EtOAc. The combined organic extracts were washed with a sat. aq. NaHCO3 solution, dried (phase separator) and evaporated to give the title compound (beige solid). MS-1: MS m/z [M+H]+ 222.1/224.1.
A solution of methyl 3-(2-chloroacetamido)tetrahydrofuran-3-carboxylate (Step 2, 4.90 g, 21.5 mmol), benzylamine (7.03 mL, 64.3 mmol) and Et3N (5.95 mL, 42.9 mmol) in MeOH (22 mL) was heated at reflux for 2.5 h. The reaction mixture was concentrated under reduced pressure to give methyl 3-(2-(benzylamino)acetamido)tetrahydrofuran-3-carboxylate which was solubilized in xylenes (22 mL) and stirred at reflux for 17 h. The reaction mixture was poured into a sat. aq. NaHCO3 solution and extracted with CH2Cl2 (×2). The combined organic extracts were dried (phase separator), concentrated under reduced pressure and the crude product was purified by normal phase chromatography (eluent: MeOH in CH2Cl2 0 to 5%) to give the title compound. UPLC-MS-2a: Rt=0.64 min; MS m/z [M+H]+ 261.2.
To an ice-cooled suspension of 9-benzyl-2-oxa-6,9-diazaspiro[4.5]decane-7,10-dione (Step 3, 4.37 g, 16.8 mmol) in THF (22 mL) was slowly added LiAlH4 (1M in THF, 33.6 mL, 33.6 mmol) and the reaction mixture was stirred at reflux for 1 h. After completion of the reaction, the RM was cooled to 0-5° C. and water (1.28 mL) was carefully added, followed by addition of NaOH (15% aq., 1.28 mL) and then water (3.83 mL). The white suspension was stirred at 0-5° C. for 30 min and Na2SO4 was added. The mixture was filtered and washed with EtOAc. The filtrate was concentrated under reduced pressure and the crude residue was purified by normal phase chromatography (eluent: MeOH in CH2Cl2 0 to 20%) to give the title compound as a yellow oil. UPLC-MS-3: Rt=0.32 min; MS m/z [M+H]+ 233.3.
To 1-Boc-2,2-dimethylpiperazine (1.00 g, 4.67 mmol), 2,2,2-trifluoroethyl trifluoromethanesulfonate (1.62 g, 7.00 mmol) and Cs2CO3 (3.04 g, 9.33 mmol) was added acetonitrile (23 mL) and the resulting suspension was stirred at RT under N2 atmosphere for 64 h. The reaction mixture was filtered through a pad of celite and the filtrate was concentrated. The crude residue was purified by normal phase chromatography (eluent: MeOH in CH2Cl2 from 0 to 10%) to give the title compound as a clear oil. MS-1; MS m/z [M+H]+ 297.2.
To a solution of tert-butyl 2,2-dimethyl-4-(2,2,2-trifluoroethyl)piperazine-1-carboxylate (1.20 g, 4.05 mmol) in 1,4-dioxane (4.1 mL) was added HCl (4N in dioxane, 12.1 mL, 48.6 mmol) and the reaction mixture was stirred at RT for 1.5 h. After completion of the reaction, the mixture was frozen and lyophilized to give the title compound as a hydrochloride salt as a white solid. MS-1; MS m/z [M+H]+ 197.1.
To a solution of tert-butyl (1R,4R)-2,5-diazabicyclo[2.2.1]heptane-2-carboxylate (1.50 g, 7.57 mmol) in CH2Cl2 (15 mL) were added triethylamine (2.11 mL, 15.1 mmol) and methanesulfonyl chloride (0.59 mL, 7.57 mmol) at 0° C. The mixture was stirred for 1 h at RT. The mixture was washed with HCl (1N in H2O, 15 mL), sat. aq. NaHCO3 solution (15 mL), twice with water (15 mL) and brine (15 mL), dried (MgSO4), filtered and concentrated under vacuum to give the title compound as a white solid. UPLC-MS-4: Rt=0.57 min; MS m/z [M+H-Boc]+177.1.
To a stirred solution of tert-butyl (1R,4R)-5-(methylsulfonyl)-2,5-diazabicyclo[2.2.1]heptane-2-carboxylate (Step 1, 2.10 g, 7.60 mmol) in CH2Cl2 (15 mL) was added TFA (1.76 mL, 22.8 mmol) at RT and the reaction mixture was stirred at RT for 24 h. The RM was evaporated to dryness and the crude residue was dissolved in methanol (15 mL), MP-Carbonate (10 g, 7.60 mmol) was added and the mixture was swirled at 40° C. for 1 h. The mixture was filtered and the filtrate was concentrated under vacuum to give the title compound. UPLC-MS-4: Rt=0.13 min; MS m/z [M+H]+ 177.1.
To a solution of tert-butyl 2,2-dimethyl-4-oxopiperidine-1-carboxylate (44.6 g, 186 mmol) in CH2Cl2 (220 mL) at 0° C. was added HCl (4M in 1,4-dioxane, 195 mL, 781 mmol). The reaction mixture was allowed to reach RT and stirredt at RT for 3 h. The reaction mixture was evaporated to dryness and dried under vacuum overnight to give the tithe compound as a beige solid whcih was used without purification in the next step. MS-1: MS m/z [M+H]+ 128.1.
To a solution of 2,2-dimethylpiperidin-4-one (34.3 g, 199 mmol) in ethanol (350 mL) cooled at 0° C. were added triethyl orthoformate (33.2 mL, 199 mmol) and PTSA (3.79 g, 19.9 mmol). The reaction mixture was slowly allowed to return to RT and was stirred overnight at RT. The reaction mixture was diluted with AcOEt and washed with a sat. aq. Na2CO3 solution (×2) then with water and brine. The combined aqueous layers were extracted again with AcOEt. The combined organic extracts were dried (Na2SO4), filtered and concentrated. 1H NMR (400 MHz, DMSO-d6) δ 3.36 (m, 4H), 2.67 (m, 2H), 1.52 (m, 2H), 1.45 (s, 2H), 1.07 (t, 6H), 1.03 (s, 6H).
The title compound was prepared by a method similar to that of 4,4-diethoxy-2,2-dimethylpiperidine (Intermediate A47) using tert-butyl 8-oxo-5-azaspiro[3.5]nonane-5-carboxylate instead of tert-butyl 2,2-dimethyl-4-oxopiperidine-1-carboxylate. 1H NMR (400 MHz, DMSO-d6) δ 3.36 (q, 4H), 2.57 (m, 2H), 1.94 (m, 2H), 1.69 (m, 4H), 1.62 (s, 2H), 1.52 (m, 2H), 1.07 (t, 6H).
To a solution of tert-butyl 2,2-dimethyl-4-oxopiperidine-1-carboxylate (1.00 g, 4.18 mmol) in methanol (10 mL) was added 3-methoxyazetidine (0.77 g, 6.27 mmol) and acetic acid (0.24 mL, 4.18 mmol). The mixture was stirred at RT 1 h and sodium triacetoxyborohydride (2.66 g, 12.5 mmol) was added. The reaction mixture was stirred at RT for 16 h. Water was added and the mixture was extracted EtOAc (×2). The combined organic extracts were washed with water. The combined water layers were extracted with nBuOH, dried (Na2SO4), filtered and concentrated to give the title compound which was used without purification in the next step. UPLC-MS-2a: Rt=0.66 min; MS m/z [M+H]+ 300.4.
To a stirred solution of tert-butyl 4-(3-methoxyazetidin-1-yl)-2,2-dimethylpiperidine-1-carboxylate (Step 1, 700 mg, 2.35 mmol) in dioxane (4 mL) was added HCL (4M in dioxane, 5.86 mL, 23.5 mmol) and the reaction mixture was stirred at RT for 16 h. The reaction mixture was evaporated to dryness to give the title compound which was used without purification in the next step. UPLC-MS-2a: Rt=0.30 min; MS m/z [M+H]+ 199.3.
The following examples A50 to A52 were prepared using analogous methods to method-A49 from commercially available precursors (in Step 1).
Molecular sieves (4° A) were added to a mixture of tert-butyl 2,2-dimethyl-4-oxopiperidine-1-carboxylate (5.00 g, 22 mmol) and morpholine (2.27 mL, 22.0 mmol) in DCE (150 mL) under N2 atmosphere and the mixture was stirred for 30 min. Titanium (IV) isopropoxide (6.51 mL, 22.0 mmol) was added dropwise and the reaction mixture was heated to 60° C. for 16 h. The RM was then cooled to 0° C., sodium cyanoborohydride (1.66 g, 26.4 mmol) was added portionwise and the RM was heated again at 70° C. for 8 h. After completion of the reaction, the RM was concentrated under vacuum. The crude residue was dissolved in EtOAc and the insoluble precipitate was filtered through a pad of celite and washed with EtOAc. The filtrate was washed with a sat. aq. sol. of sodium bicarbonate, with brine, dried (Na2SO4), filtered and concentrated under vacuum. The crude product was purified by normal phase chromatography (eluent: 0 to 5% MeOH in CH2Cl2) to give the title compound. UPLC-MS-5: Rt=1.34 min, MS m/z [M+H]+ 299.3.
To a solution of tert-butyl 2,2-dimethyl-4-morpholinopiperidine-1-carboxylate (3.82 g, 12.7 mmol) in CH2Cl2 (15 mL) at 0° C. was added HCl (4M in dioxane, 12.8 mL) and the reaction mixture was stirred at RT for 2 h. The RM was concentrated under vacuum and co-distilled with toluene to afford the title product as a HCl salt. The salt was dissolved in MeOH (15 mL), tetra alkylammonium carbonate polymer bound resin (Sigma Aldrich cat. 540293, 16 g) was added and the round bottom flask was swirled at 40° C. until the pH of the solution became basic. The mixture was filtered through Millipore and washed with MeOH. The filtrate was concentrated under vacuum and the crude residue was purified by normal phase chromatography on basic alumina (eluent: 0 to 5% MeOH in CH2Cl2) to give the title compound. UPLC-MS-5: Rt=0.28 min, MS m/z [M+H]+ 199.3.
To a stirred solution of tert-butyl 2,2-dimethyl-4-oxopiperidine-1-carboxylate (19.6 g, 86 mmol) in MeOH (200 mL) was added under argon MeNH2 (2M in MeOH, 86 mL, 172 mmol) and AcOH (4.94 mL, 86 mmol). Then, the reaction mixture was stirred for 1 h at RT and NaBH(OAc)3 (54.8 g, 259 mmol) was added. After completion, the reaction mixture was quenched with 250 mL of H2O and extracted with CH2Cl2. The aqueous layer was basified with NaOH (1N) to pH 9-10 and was extracted then extracted with CH2Cl2 (×2). The combined organic extracts were dried (Na2SO4), filtered and evaporated. The crude residue was purified by normal phase chromatography (eluent: MeOH in CH2Cl2 from 0% to 10%) to give the title compound as a white solid. UPLC-MS-2a: Rt=0.62 min; MS m/z [M+H]+ 243.3.
To a stirred solution of tert-butyl (R)-2,2-dimethyl-4-(methylamino)piperidine-1-carboxylate (Step 1, 18.7 g, 77 mmol) in CH2Cl2 (250 mL) under argon were added acetyl chloride (8.23 mL, 116 mmol) and NEt3 (26.9 mL, 193 mmol) and the reaction mixture was stirred for 30 min at 0° C. The reaction mixture was quenched with 250 mL of sat. aq. NaHCO3, extracted with CH2Cl2 (×2), the combined organic extracts were washed with a sat. aq. NaHCO3 solution, dried (Na2SO4), filtered and evaporated. The crude residue was purified by normal phase chromatography (eluent: MeOH in CH2Cl2 from 0% to 8%) to give the title compound as a yellow oil. The enantiomers were separated by chiral SFC (C-SFC-13; mobile phase: CO2/IPA: 80/20) to give tert-butyl (R)-2,2-dimethyl-4-(N-methylacetamido)piperidine-1-carboxylate as the first eluting enantiomer; C-SFC-17 (mobile phase: CO2/[IPA+0.05% DEA] 95/5 to 60/40) Rt=5.67 min, UPLC-MS-2a: Rt=0.6 min; MS m/z [M+H]+ 285.2 and tert-butyl (S)-2,2-dimethyl-4-(N-methylacetamido)piperidine-1-carboxylate as the second eluting enantiomer: C-SFC-17 (mobile phase: CO2/[IPA+0.05% DEA] 95/5 to 60/40) Rt=5.90 min, UPLC-MS-2a: Rt=0.6 min; MS m/z [M+H]+ 285.2.
To a stirred solution of tert-butyl (R)-2,2-dimethyl-4-(N-methylacetamido)piperidine-1-carboxylate (Step 2, 10.7 g, 37.6 mmol) in dioxane (100 mL) was added under argon HCl (4N in dioxane, 94 mL, 376 mmol) and the reaction mixture was stirred for 16 h at RT. The reaction mixture was concentrated to afford the title compound as a hydrochloride salt as white solid. UPLC-MS-2a: Rt=0.22 min; MS m/z [M+H]+ 185.3.
To a stirred solution of tert-butyl (S)-2,2-dimethyl-4-(N-methylacetamido)piperidine-1-carboxylate (Step 2 in the synthesis of Intermediate A54, 10.0 g, 35.2 mmol) in dioxane (100 mL) was added under argon HCl (4N in dioxane, 88 mL, 352 mmol) and the reaction mixture was stirred for 20 h at RT. The RM was concentrated to afford the title compound as a hydrochloride salt as white solid. UPLC-MS-2a: Rt=0.22 min; MS m/z [M+H]+ 185.2.
To a solution of tert-butyl 2,2-dimethyl-4-oxopiperidine-1-carboxylate (2.00 g, 8.81 mmol) in MeOH (20 mL) at 0° C. was added under nitrogen NaBH4 (0.50 g, 13.2 mmol) portion wise over a period of 10 min and the reaction mixture was stirred at 0° C. for 40 min. The reaction mixture was quenched with cold water and extracted with EtOAc. The combined organic extracts were washed with brine, dried (Na2SO4), filtered and concentrated under vacuum to give the title compound which was used directly in the next step without further purification. UPLC-MS-5: Rt=1.55 min; MS m/z [M−56]+ 174.3.
To a solution of tert-butyl 4-hydroxy-2,2-dimethylpiperidine-1-carboxylate (Step 1, 1.50 g, 6.55 mmol) in CH2Cl2 (20 mL) was added at 0° C. under nitrogen atmosphere imidazole (0.89 g, 13.1 mmol) and the mixture was stirred for 10 min at 0° C. Tert-butyldiphenylsilyl chloride (2.16 g, 7.86 mmol) was added slowly and the RM was stirred at RT for 16 h. The reaction mixture was quenched with cold water and extracted with CH2Cl2. The combined organic extracts were washed with brine, dried (Na2SO4), filtered and concentrated under vacuum to give the title compound which was used directly in the next step without further purification. 1H NMR (400 MHz, CDCl3) δ 7.74-7.66 (m, 6H), 7.46-7.37 (m, 4H), 3.91-3.89 (m, 1H), 3.72-3.66 (m, 1H), 3.14-3.07 (m, 1H), 1.81-1.80 (m, 1H), 1.68-1.62 (m, 1H), 1.59-1.56 (m, 5H) 1.54-1.53 (m, 3H), 1.50 (s, 9H), 1.15-1.01 (m, 9H).
To a solution of tert-butyl 4-((tert-butyldiphenylsilyl)oxy)-2,2-dimethylpiperidine-1-carboxylate (Step 2, 3.00 g, 6.41 mmol) in CH2Cl2 (15 mL) at 0° C. under nitrogen atmosphere was added TFA (30 mL) and reaction mixture was stirred at RT for 2 h. The RM was concentrated under reduced pressure and co distilled with CH2Cl2 several times. The crude residue was purified by reverse phase chromatography (eluent: 0 to 45% CH3CN in H2O containing 0.1% NH3) to afford the title product. UPLC-MS-5: Rt=1.76 min; MS m/z [M+H]+ 368.7.
A solution of tert-butyl 3-oxopyrrolidine-1-carboxylate (2.50 g, 13.4 mmol) in DMF-DMA (1/1, 18 mL) was stirred at 140° C. for 1 h. After completion of the reaction, the reaction mixture was concentrated to dryness, dissolved in a minimum amount of CH2Cl2 and triturated with hexane to afford the title product. 1H NMR (400 MHz, DMSO-d6) δ 7.22 (s, 1H), 4.50 (m, 2H), 3.59 (m, 2H), 3.07 (s, 6H), 1.50 (s, 9H).
To a solution of tert-butyl-3-((dimethylamino)methylene)-4-oxopyrrolidine-1-carboxylate (Step 1, 2.00 g, 8.33 mmol) in MeOH (24 mL) was added methyl hydrazine (0.47 g, 10.3 mmol) and the reaction mixture was heated under reflux for 2.5 h in a sealed tube. After completion of reaction, the RM was concentrated to dryness and the crude product was triturated with pentane and Et2O to give a yellow solid. The solid was dissolved in TFA (40 mL) at 0° C. and the solution was stirred for 1 h at RT and then concentrated. The residue was dissolved in ethanol (10 mL) and treated with conc. aq. HCl (2.40 mL). After removing the solvent under vacuum, the resulting solid was triturated with 2-propanol and Et2O to afford the title product as a hydrochloride salt. UPLC-MS-5=Rt=0.26 min, MS m/z [M+H]+ 124.15, 1H NMR (400 MHz, DMSO-d6) δ 10.72 (s, 1H), 7.26 (s, 1H), 4.21 (m, 2H), 4.04 (m, 2H), 3.78 (s, 3H).
To a solution of 1-methyl-1,4,5,6-tetrahydropyrrolo[3,4-c]pyrazole hydrochloride (0.20 g, 1.25 mmol) in MeOH (4 mL) was added tetra alkyl ammonium carbonate polymer bound (0.50 g) and the mixture was stirred for 15 min at RT. The pH of the reaction mixture changed to basic and the reaction mixture was filtered through Millipore and concentrated under vacuum to afford the title product. 1H NMR (400 MHz, DMSO-d6) δ 7.21 (s, 1H), 4.26 (m, 2H), 4.10 (m, 2H), 3.75 (s, 3H).
A mixture of (3aR*,7aS*)-5-benzyloctahydro-1H-pyrrolo[3,4-c]pyridin-1-one (950 mg, 4.12 mmol) and NaH (60% in mineral oil, 330 mg, 8.25 mmol) in THF (20 mL) was stirred at 0° C. under a nitrogen atmosphere for 5 min, before addition of iodomethane (270 μL, 4.33 mmol). The reaction mixture was stirred at RT for 4 h. NaH (60% in mineral oil, 495 mg, 12.4 mmol) and iodomethane (405 μL, 6.50 mmol) were added and the RM was further stirred for 6 h. The reaction mixture was carefully poured into a sat. aq. NaHCO3 solution and extracted with CH2Cl2 (×3). The combined organic extracts were dried (phase separator) and evaporated. The crude residue was purified by normal phase chromatography (eluent: MeOH in CH2Cl2 from 0 to to 10%) to give the title compound. NMR (600 MHz, DMSO-d6) δ 7.33-7.23 (m, 5H), 4.41 (d, 1H), 4.38 (d, 1H), 3.32 (m, 1H), 2.84 (d, 1H), 2.72 (s, 3H), 2.66 (m, 1H), 2.45 (m, 1H), 2.40 (m, 2H), 1.83-1.69 (m, 4H).
In an autoclave, to a solution of (3aS*,7aS*)-5-benzyl-2-methyloctahydro-1H-pyrrolo[3,4-c]pyridin-1-one (Step 1, 705 mg, 2.89 mmol) in MeOH (40 mL) was added Pd(OH)2/C 20% (50% wet, 0.10 g). The mixture was placed under a hydrogen atmosphere (4 bars) and stirred for 14 h. Pd(OH)2/C 20% (50% wet, 0.11 g) was added again and the mixture further stirred under hydrogen atmosphere for 15 h. Pd/C 10% (50% wet, 0.05 g) was added and the mixture further stirred under hydrogen atmosphere for 14 h. The reaction mixture was filtered over a pad of celite and washed with MeOH and CH2Cl2. The filtrate was evaporated to give the title product which was used without purification in the next step. NMR (600 MHz, DMSO-d6) δ 3.29 (m, 1H), 2.87 (m, 1H), 2.84 (m, 1H), 2.72 (s, 3H), 2.64 (m, 1H), 2.41 (m, 1H), 2.28-2.20 (m, 2H), 1.78 (m, 1H), 1.70 (m, 1H), 1.57 (m, 1H).
Under nitrogen atmosphere, to anhydrous DME (350 mL) were successively added LDA (2M in THF, 34.3 mL, 68.6 mmol) at −78° C. and a solution of N-benzyl piperidine-4-one (10.0 g, 52.8 mmol) in anhydrous DME (10 mL). The mixture was stirred for 5 min and 1,3-dimethyl-3,4,5,6-tetrahydro-2(1H)-pyrimidinone (10.0 g, 52.8 mmol) was added. The mixture was stirred at −78° C. for 20 min and methylbromo acetate (10.5 g, 68.6 mmol) was added over a period of 7 min. The reaction mixture was stirred for 20 min at −78° C. and was allowed to gradually warm to −40° C. and was further stirred for 45 min. After completion of reaction, the reaction mixture was quenched by adding a sat. aq. NaHCO3 solution at −40° C. and was extracted with EtOAc (×2). The combined organic layer was washed with brine, dried (Na2SO4), filtered and concentrated under vacuum. The crude residue was purified by normal phase chromatography (eluent: 0 to 5% MeOH in CH2Cl2) to give the title product. UPLC-MS-5: Rt=1.34 min, MS [M+H]+ 262.2.
To a solution of methyl 2-(1-benzyl-4-oxopiperidin-3-yl)acetate (Step 1, 5.33 g, 20.4 mmol) in MeOH (150 mL) at 0° C. were added methylamine hydrochloride (20.7 g, 306.3 mmol) and sodium cyanoborohydride (2.56 g, 40.9 mmol) and the mixture was heated in a screw capped vial at 85° C. for 4 days. After completion of the reaction, the reaction mixture was basified by addition of a sat. aq. NaHCO3 solution (pH 8) and extracted with EtOAc (×3). The combined organic layer was washed with brine, dried (Na2SO4), filtered and concentrated under vacuum. The crude residue was purified by normal phase chromatography (eluent: MeOH:hexane:ethyl acetate, 0.7:3:6.3) to give the first eluting peak of the title product: Isomer I: UPLC-MS-10: Rt=4.91 min, MS m/z [M+H]+ 245.0; 1H NMR (400 MHz, Methanol-d4) δ 7.36-7.27 (m, 5H), 3.69-3.61 (m, 2H), 3.15 (m, 1H), 3.08 (m, 1H), 3.00-2.97 (m, 1H), 2.76 (s, 3H), 2.32-2.25 (m, 2H), 2.20-2.0 (m, 4H), 1.68-1.60 (m, 1H), and the second eluting peak of the title product: Isomer II: UPLC-MS-5: Rt=1.19 min, MS m/z [M+H]+ 245.0; 1H NMR (400 MHz, Methanol-d4) δ 7.35-7.27 (m, 5H), 3.65-3.61 (m, 2H), 3.56-3.48 (m, 2H), 2.80 (s, 3H), 2.68-2.59 (m, 1H), 2.58-2.37 (m, 3H), 2.27-2.20 (m, 1H), 2.18-2.09 (m, 1H), 2.08-1.98 (m, 1H), 1.96-1.87 (m, 1H).
A solution of (3aR*,7aR*)-5-benzyl-1-methyloctahydro-2H-pyrrolo[3,2-c]pyridin-2-one isomer-I (Step 2 Isomer I, 2.10 g, 8.60 mmol) in isopropyl alcohol (20 mL) was purged with nitrogen gas for 10 min under stirring, Pd/C 10% (1.30 g, 1.2 mmol) was added and the reaction mixture was stirred under the 1 atmosphere of hydrogen at RT for 20 h. After completion of the reaction, the reaction mixture was filtered through a pad of celite and washed with isopropyl alcohol. The filtrate was concentrated under vacuum to afford the title product, which was used in the next step without further purification. UPLC-MS-11: Rt=3.60 min, MS m/z [M+H]+ 155.0.
Triethylphosphonoacetate (5.90 g, 26.4 mmol) was dissolved in dry THF (40 mL) and cooled to −78° C. under nitrogen atmosphere. n-BuLi (3.60 M in hexane, 7.00 mL, 26.4 mmol) was added and the mixture was stirred for 30 min at −78° C. Tert-butyl 2,2-dimethyl-4-oxopiperidine-1-carboxylate (2.00 g, 8.80 mmol) was then added at −78° C. and the reaction mixture was stirred at RT for 16 h. After completion of the reaction, the RM was diluted with water and extracted with EtOAc (×3). The combined organic extracts were washed with brine, dried (Na2SO4), filtered and concentrated under reduced pressure. The crude residue was purified by normal phase chromatography (eluent: 5% EtOAc in hexane) to give the title compound. UPLC-MS-5: Rt=2.03 min, MS m/z [M-Boc]+198.4.
To a stirred solution of tert-butyl-4-(2-ethoxy-2-oxoethylidene)-2,2-dimethylpiperidine-1-carboxylate (Step 1, 2.78 g, 9.36 mmol) in THF (30 mL) under argon atmosphere, TBAF (4.43 g, 14.0 mmol) was added and the mixture was stirred at RT for 5 min. Nitromethane (1.14 g, 18.7 mmol) was then added and the reaction mixture was heated at 80° C. for 16 h. The reaction mixture was diluted with water and extracted with EtOAc (×2). The combined organic later was washed with brine, dried (Na2SO4), filtered and concentrated under reduced pressure. The crude residue was purified by normal phase chromatography (eluent: 5% EtOAc in hexane) to give the title product. UPLC-MS-5: Rt=2.01 min, MS m/z [M+H]+ 359.35.
To a solution of tert-butyl 4-(2-ethoxy-2-oxoethyl)-2,2-dimethyl-4-(nitromethyl)piperidine-1-carboxylate (Step 2, 2.80 g, 7.82 mmol) in EtOH (30 mL) was added Pd/C 10% (1.40 g) and the reaction mixture was stirred under hydrogen pressure (5 atm.) at 60° C. for 6 h. After completion of the reaction, the reaction mixture was filtered through a pad of celite and washed with EtOAc. The filtrate was concentrated under reduced pressure to give the title compound which was used in the next step without further purification. UPLC-MS-5: Rt=1.57 min, MS m/z [M+H]+ 283.3.
To a solution of tert-butyl 7,7-dimethyl-3-oxo-2,8-diazaspiro[4.5]decane-8-carboxylate (Step 3, 2.30 g, 7.90 mmol) in dry THF (20 mL) at 0° C. under nitrogen atmosphere was added sodium hydride (55% in oil, 0.69 g, 15.8 mmol) and the mixture was stirred at RT for 30 min. Methyl iodide (5.60 g, 39.5 mmol, 5.0 equiv) was then added slowly at 0° C. and the reaction mixture was allowed to reach RT and stirred for 5 h. The RM was diluted with water and extracted with EtOAc (×2). The combined organic layer was washed with brine, dried (Na2SO4), filtered and concentrated under reduced pressure. The crude residue was purified by normal phase chromatography (eluent: 0 to 2% MeOH in CH2Cl2) to give the title compound. UPLC-MS-5: Rt=1.58 min, MS m/z [M+H]+ 297.6.
To a solution of tert-butyl 2,7,7-trimethyl-3-oxo-2,8-diazaspiro[4.5]decane-8-carboxylate (Step 4, 1.50 g, 5.06 mmol) in CH2Cl2 (15 mL) at 0° C. under nitrogen atmosphere was added dropwise HCl (4M in dioxane, 8.00 mL, 32 mmol) and the reaction mixture was stirred at RT for 3 h. The RM was concentrated under reduced pressure and co-distilled with CH2Cl2 several times to give a crude residue which was dissolved in MeOH (10 mL). Tetra alkylammonium carbonate resin bound (Sigma Aldrich cat. 540293, 2.50 g) was added and the mixture was swirled at 40° C. for 2 h, then was filtered through a pad of celite and the filtrate was concentrated to give the title compound. UPLC-MS-5: Rt=0.30 min, MS m/z [M+H]+ 197.2.
Z-2-Methylalanine (20.0 g, 84.0 mmol) was dissolved in CH2Cl2 (400 mL) and cooled to 0° C. under nitrogen atmosphere. N,O-dimethylhydroxyl amine (9.60 g, 101 mmol), HATU (48.0 g, 127 mmol) and Et3N (46 mL, 337 mmol) were added and the reaction mixture was stirred at RT for 16 h. After completion of the reaction, the RM was quenched with water and extracted with EtOAc. The combined organic layer was washed with water, brine, dried (Na2SO4), filtered and concentrated under vacuum. The crude residue was purified normal phase chromatography (eluent: 10 to 50% EtOAc in hexane) to give the title product. UPLC-MS-5: Rt=1.51 min, MS m/z [M+H]+ 281.6.
Benzyl (1-(methoxy(methyl)amino)-2-methyl-1-oxopropan-2-yl)carbamate (Step 1, 13.0 g, 46.4 mmol) was dissolved in THF (260 mL) and cooled to −78° C. under nitrogen atmosphere. LiAlH4 (1M in THF, 46.4 mL, 46.4 mmol) was added dropwise and the reaction mixture was stirred at −78° C. for 40 min. After completion of the reaction, the RM was quenched by dropwise addition of EtOAc at −78° C. A saturated solution of sodium sulphate was then added very slowly and the mixture was stirred at RT for 15 min. The mixture was filtered through a pad of celite, washed with EtOAc and the filtrate was concentrated under vacuum to afford the title product which was used in the next step without further purification. 1H NMR (400 MHz, CDCl3) δ 9.47 (s, 1H), 7.43-7.36 (m, 5H), 5.29 (s, 1H), 5.13 (s, 2H), 1.42 (s, 6H).
To a solution of benzyl (2-methyl-1-oxopropan-2-yl)carbamate (Step 2, 10.5 g, 47.7 mmol) in MeOH (100 mL) cooled to 0° C. was added NH3 (30% aq. solution, 100 mL) followed by glyoxal (40% in water, 55.4 g, 955 mmol) and the reaction mixture was stirred at RT for 48 h. After completion of the reaction, the RM was concentrated under vacuum, diluted with water and extracted with EtOAc. The combined organic layer was washed with brine, dried (Na2SO4), filtered and concentrated under vacuum. The crude residue was purified by normal phase chromatography (eluent: 0 to 60% EtOAc in hexane) to give the title product. 1H NMR (400 MHz, DMSO-d6) δ 11.67 (s, 1H), 7.48 (s, 1H), 7.36-7.32 (m, 5H), 6.80 (s, 1H), 4.96 (s, 2H), 1.55 (s, 6H). UPLC-MS-5: Rt=1.28 min, MS m/z [M+H]+ 260.6.
To a solution of benzyl (2-(1H-imidazol-2-yl)propan-2-yl)carbamate (Step 3, 5.00 g, 19.3 mmol) dissolved in DMF (100 mL) were added K2CO3 (5.32 g, 38.6 mmol) and ethylbromoacetate (4.80 g, 29.0 mmol) and the reaction mixture was stirred at RT for 15 h. After completion of the reaction, the RM was quenched with water and extracted with EtOAc. The combined organic layer was washed with cold water, brine, dried (Na2SO4), filtered and concentrated under vacuum to afford the title product. UPLC-MS-5: Rt=1.34 min, MS m/z [M+H]+ 346.6.
To a solution of ethyl 2-(2-(2-(((benzyloxy)carbonyl)amino)propan-2-yl)-1H-imidazol-1-yl)acetate (Step 4, 7.00 g, 20.3 mmol) in MeOH (250 mL) was added Pd/C 10% (2.40 g, 2.20 mmol) and the reaction mixture was stirred at RT under 1 atmosphere of hydrogen pressure for 15 h. After completion of the reaction, the RM was filtered through a pad of celite and washed with MeOH. The filtrate was concentrated under vacuum and the crude residue was purified by normal phase chromatography on basic alumina (eluent: 0 to 5% MeOH in CH2Cl2) to obtain the title product. 1H NMR (400 MHz, DMSO-d6) δ 8.62 (s, 1H), 7.05 (s, 1H), 6.90 (s, 1H), 4.67 (s, 2H), 1.50 (s, 6H).
To a solution of 8,8-dimethyl-7,8-dihydroimidazo[1,2-a]pyrazin-6(5H)-one (Step 5, 1.00 g, 6.06 mmol) in dry THF (6 mL) was added diphenylsilane (10 mL) and the reaction mixture was degassed with nitrogen for 10 min. RhCO(PPh3)3 (0.28 g, 0.30 mmol) was added and the reaction mixture was stirred at RT for 16 h. After completion of the reaction, the RM was diluted with EtOAc and extracted with cold 1N HCl aq. solution. The aqueous layer was then basified with a sat. aq. NaHCO3 solution and extracted with EtOAc (multiple times). The combined organic layer was concentrated under vacuum and the crude residue was purified by reverse phase chromatography (eluent: 0 to 30% CH3CN in water containing 0.1% NH3) to give the title product. 1H NMR (400 MHz, DMSO-d6) δ 6.92 (s, 1H), 6.70 (s, 1H), 4.60 (m, 2H), 3.07 (m, 2H), 2.24 (m 1H), 1.34 (s, 6H).
Under argon atmosphere, to a solution of 1-(1H-pyrazol-5-yl)ethan-1-one (10.0 g, 91.0 mmol) and tert-butyl (2-hydroxyethyl)carbamate (18.3 mL, 118 mmol) in 1,4-dioxane (100 mL) were added PPh3 (35.7 g, 136 mmol) and DEAD (21.6 mL, 136 mmol) at 0° C. and the reaction mixture was stirred at RT for 16 h. The reaction mixture was quenched with a sat. aq. NaHCO3 solution and extracted with EtOAc (×2). The combined organic layers were dried (Na2SO4), filtered and concentrated in vacuo and the crude residue was purified by normal phase chromatography (eluent: EtOAc in c-hexane 25 to 50%) to give the title compound as a colorless oil. UPLC-MS-2b: Rt=0.84 min; MS m/z [M+H]+ 254.2.
To a solution of tert-butyl (2-(5-acetyl-1H-pyrazol-1-yl)ethyl)carbamate (Step 1, 12.8 g, 50.5 mmol) in CH2Cl2 (200 mL) was added TFA (19.5 mL, 253 mmol) and the reaction mixture was stirred at RT for 2 h. The reaction mixture was quenched with a sat. aq. NaHCO3 solution and extracted with CH2Cl2 (×2). The combined organic layers were dried (Na2SO4), filtered and concentrated in vacuo to give the title compound as a colorless oil. UPLC-MS-2b: Rt=0.24 min; MS m/z [M+H]+ 136.0.
To a solution of 4-methyl-6,7-dihydropyrazolo[1,5-a]pyrazine (Step 2, 3.00 g, 22.2 mmol) in THF (120 mL) was added PtO2 (504 mg, 2.22 mmol) and the reaction mixture was stirred at RT under H2 atmosphere for 2 h. The reaction mixture was filtered through a celite pad and the filtrate was concentrated in vacuo. The crude residue was purified by normal phase chromatography (eluent: MeOH in CH2Cl2 0 to 10%) to give the title compound as a colorless oil. The enantiomers were separated by chiral SFC (C-SFC-25; mobile phase: CO2/MeOH: 90/10) to give 4-methyl-4,5,6,7-tetrahydropyrazolo[1,5-a]pyrazine Intermediate A62a as the first eluting enantiomer: 1H NMR (400 MHz, DMSO-d6) δ 7.33 (d, 1H), 6.01 (dd, 1H), 3.98 (ddd, 1H), 3.94-3.85 (m, 2H), 3.23 (dd, 1H), 2.99 (m, 1H), 2.59 (br s, 1H), 1.31 (d, 3H) and 4-methyl-4,5,6,7-tetrahydropyrazolo[1,5-a]pyrazine Intermediate A62b as the second eluting enantiomer: 1H NMR (400 MHz, DMSO-d6) δ 7.33 (d, 1H), 6.01 (dd, 1H), 3.98 (ddd, 1H), 3.94-3.85 (m, 2H), 3.23 (dd, 1H), 2.99 (m, 1H), 2.59 (br s, 1H), 1.31 (d, 3H).
Under Ar, to a solution of 2-((tert-butoxycarbonyl)amino)-2-methylpropanoic acid (10.0 g, 49.2 mmol), N,O-dimethylhydroxylamine hydrochloride (5.76 g, 59.0 mmol), DMAP (7.21 g, 59.0 mmol) and DIPEA (10.3 mL, 59.0 mmol) in CH2Cl2 (200 mL) was added DCC (12.2 g, 59.0 mmol). The reaction mixture was stirred at RT for 40 h. The RM was quenched with a sat. aq. NaHCO3 solution and extracted with EtOAc (×2). The combined organic layers were washed with a sat. aq. NaHCO3 solution then dried over (Na2SO4), filtered, and concentrated in vacuo. The crude residue was purified by normal phase chromatography (eluent: EtOAc in c-hexane 0 to 45%) to give the title compound as a white solid. UPLC-MS-2b: Rt=0.83 min; MS m/z [M+H]+ 246.8.
Under Ar, to a solution of tert-butyl (1-(methoxy(methyl)amino)-2-methyl-1-oxopropan-2-yl)carbamate (Step 1, 6.23 g, 25.3 mmol) in THF (100 mL) was added a solution of MeMgBr (3M in Et2O, 25.3 mL, 76.0 mmol) at 0° C. The reaction mixture was stirred at RT for 3 h. The RM was quenched with a sat. aq. NH4Cl solution and extracted with EtOAc (×2). The combined organic layers were washed with a sat. aq. NH4Cl solution then dried (Na2SO4), filtered, and concentrated in vacuo. The crude residue was purified by normal phase chromatography (eluent: EtOAc in c-hexane 0 to 59%) to give the title compound as a white solid. UPLC-MS-2b: Rt=0.87 min; MS m/z [M+H]+ 202.1.
A mixture of tert-butyl (2-methyl-3-oxobutan-2-yl)carbamate (Step 2, 3.34 g, 16.6 mmol) in DMF-DMA (1-1, 44.4 mL, 332 mmol) was stirred at 100° C. for 16 h. The reaction mixture was cooled to RT then concentrated in vacuo. And the crude residue was purified by normal phase chromatography (eluent: EtOAc in c-hexane 0 to 100%) to give the title compound as a brown oil. UPLC-MS-2b: Rt=0.86 min; MS m/z [M+H]+ 257.2.
To a solution of tert-butyl (E)-(5-(dimethylamino)-2-methyl-3-oxopent-4-en-2-yl)carbamate (Step 3, 1.30 g, 5.07 mmol) in EtOH (10 mL) was added 2-hydrazinoethan-1-ol (1.03 mL, 15.2 mmol). The reaction mixture was stirred at 80° C. for 20 h. The RM was cooled to RT, concentrated in vacuo and the crude residue was purified by preparative HPLC (RP-HPLC-3: mobile phase: A: water+7.3 mM NH4OH, B: acetonitrile; gradient: 5 to 100% B in 20 min) to give the title compound as a regioisomeric mixture as a yellow oil. UPLC-MS-2a: Rt=0.86 min; MS m/z [M+H]+ 270.2.
Under Ar, to a solution of tert-butyl (2-(1-(2-hydroxyethyl)-1H-pyrazol-5-yl)propan-2-yl)carbamate (Step 4, 885 mg, 3.29 mmol) in CH2Cl2 (20 mL) were added methanesulfonic anhydride (1.15 g, 6.57 mmol) and Et3N (2.29 mL, 16.4 mmol) at 0° C. The reaction mixture was stirred at RT for 1 h before concentrating in vacuo. The crude residue was purified by normal phase chromatography (eluent: MeOH in CH2Cl2 0 to 7.7%) to give the title compound as a regioisomeric mixture as a yellow oil. UPLC-MS-2a: Rt=0.87/0.88 min; MS m/z [M+H]+ 348.1.
Under Ar, to a solution of 2-(5-(2-((tert-butoxycarbonyl)amino)propan-2-yl)-1H-pyrazol-1-yl)ethyl methanesulfonate (Step 5, 1.11 g, 3.19 mmol) in DMF (20 mL) was added NaH (50% in mineral oil, 166 mg, 4.15 mmol) and the reaction mixture was stirred at RT for 2 h. The reaction was quenched with a sat. aq. NaHCO3 solution and extracted with EtOAc (×2). The combined organic layers were washed with a sat. aq. NaHCO3 solution, dried (Na2SO4), filtered and concentrated in vacuo. The crude residue was purified by preparative HPLC (RP-HPLC-3: mobile phase: A: water+7.3 mM NH4OH, B: acetonitrile; gradient: 5 to 100% B in 20 min) to give the title compound as a yellow oil. UPLC-MS-2a: Rt=1.06 min; MS m/z [M+H]+ 252.1.
A mixture of tert-butyl 4,4-dimethyl-6,7-dihydropyrazolo[1,5-a]pyrazine-5(4H)-carboxylate (Step 6, 250 mg, 1.00 mmol) and HCl (4M in 1,4-dioxane, 2.49 mL, 9.95 mmol) was stirred at RT for 16 h. The reaction mixture was concentrated in vacuo to give the title compound as a white solid. 1H NMR (400 MHz, DMSO-d6) δ 10.38 (br s, 2H), 8.65 (br s, 1H), 7.48 (d, 1H), 6.33 (d, 1H), 4.33 (t, 2H), 3.75-3.65 (m, 2H), 1.69 (s, 6H).
To a suspension of sodium hydride (1.32 g, 32.9 mmol) in DMF (30 mL) at 0° C. under N2 atmosphere was added trimethylsulfoxonium iodide (7.26 g, 32.9 mmol) and the mixture was stirred at RT for 45 min. The reaction mixture was cooled to 0° C. and a solution of 1-boc-2,2-dimethylpiperidin-4-one (5.00 g, 21.9 mmol) in DMF (20 mL) was added dropwise and the RM was stirred at RT for 1 h. After completion of the reaction, the reaction mixture was quenched with cold water and extracted with EtOAc. The combined organic extracts were washed with water, brine, dried (Na2SO4), filtered and concentrated under vacuum to afford the title compound as orange oil which was directly used in the next step without further purification. UPLC-MS-5: Rt=1.67 min; MS m/z [M+H]+ 242.4.
To a solution of tert-butyl 5,5-dimethyl-1-oxa-6-azaspiro[2.5]octane-6-carboxylate (step 1, 5.00 g, 20.7 mmol) in MeOH:Water (5:1) (60 mL) at RT was added 2-aminoethylhydrogensulfate (5.84 g, 41.4 mmol) followed by Et3N (5.76 g, 41.4 mmol) and the reaction mixture was stirred at 50° C. for 16 h. After completion of reaction, the precipitated white solid was filtered and the filtrate was concentrated under reduced pressure to afford a crude residue which was triturated in 10% MeOH in CH2Cl2 and filtered through a pad of celite. The filtrate was then concentrated under reduced pressure to give the title compound as colourless oil which was directly used in the next step without further purification. UPLC-MS-5: Rt=1.31 min; MS m/z [M−H]− 381.5.
To a solution of tert-butyl 4-hydroxy-2,2-dimethyl-4-(((2-(sulfooxy)ethyl)amino)methyl)piperidine-1-carboxylate (step 2, 7.90 g, 16.8 mmol) in THF (70 mL) and EtOH (2.5 mL) was added NaOH (2.47 g, 61.9 mmol) and the reaction mixture was stirred under reflux for 15 h. After completion of the reaction, the mixture was cooled to RT, filtered through a pad of celite and the filtrate was concentrated under vacuum. The residue was diluted with EtOAc and washed with water, brine dried (Na2SO4), filtered and concentrated under reduced pressure. The crude residue was purified by normal phase chromatography on neutral alumina (eluent: MeOH in CH2Cl2 2 to 3%) to give the title compound as orange gum. UPLC-MS-5: Rt=1.44 min; MS m/z [M+H]+ 285.4.
To a solution of tert-butyl 8,8-dimethyl-1-oxa-4,9-diazaspiro[5.5]undecane-9-carboxylate (step 3, 5.80 g, 22.8 mmol) and Et3N (10.5 mL, 75.2 mmol) in dry DMF (70 mL) was added at 0° C. under nitrogen atmosphere N-(benzyloxycarbonyloxy)succinimide (6.20 g, 25.1 mmol) and the reaction mixture was stirred at RT for 15 h. The reaction mixture was poured into ice-cold water and extracted with EtOAc. The combined organic extracts were washed with cold water, brine, dried (Na2SO4), filtered and concentrated. The crude residue was purified by normal phase chromatography (eluent: EtOAc in hexane 20 to 25%) to give the title compound. UPLC-MS-5: Rt=2.16 min; MS m/z [M+H]+ 419.5.
To a solution od 4-benzyl 9-(tert-butyl) 8,8-dimethyl-1-oxa-4,9-diazaspiro[5.5]undecane-4,9-dicarboxylate (step 4, 4.50 g, 10.7 mmol) in CH2Cl2 (50 mL) at 0° C. under nitrogen atmosphere was added HCl (4M in dioxane, 20 mL) and the reaction mixture was stirred at RT for 3 h. The reaction mixture was concentrated under reduced pressure and co-distilled with CH2Cl2 to obtain a crude residue which was purified by reverse phase chromatography (eluent: CH3CN in H2O containing 0.1% NH3 40 to 45%) to give the title compound. UPLC-MS-5: Rt=1.34 min; MS m/z [M+H]+ 319.3.
To a solution of tert-butyl 1-oxa-4,9-diazaspiro[5.5]undecane-9-carboxylate (CAS [930785-40-3], 1.50 g, 5.80 mmol) in CH2Cl2 (15 mL) at 0° C. under nitrogen atmosphere were added Et3N (0.97 mL, 7.00 mmol) followed by acetyl chloride (0.50 mL, 7.02 mmol) and the reaction mixture was stirred at RT for 5 h. After completion of the reaction, the reaction mixture was quenched with water, extracted with EtOAc. The combined organic layer was dried (Na2SO4), filtered and concentrated under vacuum. The crude residue was purified by normal phase chromatography (eluent: MeOH in CH2Cl2 0 to 5%) to give the title compound. UPLC-MS-5: Rt=1.47 min, MS m/z [M+H]+ 299.4.
To a solution of tert-butyl 4-acetyl-1-oxa-4,9-diazaspiro[5.5]undecane-9-carboxylate (Step 1, 1.50 g, 5.36 mmol) in CH2Cl2 (10 mL) at 0° C. was added HCl (4M in dioxane, 5 mL) and the reaction mixture was stirred at RT for 2 h. The RM was then concentrated under vacuum to afford the title product as a HCl salt. The salt was dissolved in MeOH (10 mL), tetraalkyl ammonium carbonate resin (Sigma Aldrich cat. 540293, 1.00 g) was added and the mixture was stirred at RT for 2 h. The mixture was then filtered through Millipore and the filtrate was concentrated under reduced pressure to give the title compound. 1H NMR (400 MHz, CDCl3) δ 3.73-3.66 (m, 4H), 3.55 (m, 2H), 3.36 (m, 4H), 3.23 (m, 2H), 2.09 (s, 3H), 1.98 (m, 2H).
Tert-butyl 5,5-dimethyl-1-oxa-6-azaspiro[2.5]octane-6-carboxylate (Step 1 in the synthesis of Intermediate A64, 5.10 g, 21.1 mmol) was dissolved in water (50 mL) and methyl amine (40% in MeOH, 50 mL) was added at 0° C. The reaction mixture was stirred at 60° C. for 4 h in a sealed tube. Water was added and the mixture was extracted with EtOAc. The combined organic extracts were washed with brine, dried (Na2SO4), filtered and concentrated under vacuum to afford the title compound which was directly used in the next step without further purification. UPLC-MS-5: Rt=1.27 min; MS m/z [M+H]+ 273.
To a solution of tert-butyl 4-hydroxy-2,2-dimethyl-4-((methylamino)methyl)piperidine-1-carboxylate (Step 1, 4.80 g, 17.6 mmol) CH2Cl2 (50 mL) at 0° C. under nitrogen atmosphere was added DIPEA (6.82 g, 52.9 mmol) and triphosgene (2.61 g, 8.81 mmol) and the reaction mixture was stirred at RT for 3 h. Water was added and the mixture was extracted with CH2Cl2. The combined organic extracts were washed with brine, dried (Na2SO4), filtered and concentrated under vacuum. The crude residue was purified by normal phase chromatography (eluent: 50 to 60% EtOAc in n-Hexane) to give the title compound as colourless gum. UPLC-MS-5: Rt=1.56 min; MS m/z [M+H]+ 299.2.
To a solution of tert-butyl 3,7,7-trimethyl-2-oxo-1-oxa-3,8-diazaspiro[4.5]decane-8-carboxylate (Step 2, 3.20 g, 10.7 mmol) in CH2Cl2 (30 mL) cooled at 0° C. was added HCl (4M in dioxane, 32 mL) and the reaction mixture was stirred at RT for 2 h. After completion of the reaction, the RM was concentrated under vacuum and co-distilled with CH2Cl2. The crude residue was dissolved in MeOH (10 mL), tetralkyl ammonium carbonate (MP-carbonate, 1.50 g) was added and the mixture was swirled at 30° C. for 15 min. The mixture was filtered through Millipore, washed with MeOH and the filtrate was concentrated under reduced pressure to give the title product as a white solid which was directly used in the next step without further purification. UPLC-MS-5: Rt=1.24 min; MS m/z [M+H]+ 199.1.
To a solution of tert-butyl 2,2-dimethyl-4-oxopiperidine-1-carboxylate (500 mg, 2.20 mmol) in DME (15.5 mL) under inert atmosphere at RT were added (p-tolylsulfonyl)methyl isocyanide (537 mg, 2.75 mmol) and EtOH (0.22 mL, 3.74 mmol). To the reaction mixture cooled at 0° C. was added dropwise tert-BuOK (1M in THF, 5.65 mL, 5.65 mmol) over a period of 5 min. Then the reaction mixture was stirred for 10 min at 0° C., warmed to RT and stirred at 50° C. overnight. After completion, the reaction was cooled to RT, water was added and the aqueous layer was extracted twice with Et2O and twice with EtOAc. The combined organic layers were dried (Na2SO4), filtered and concentrated under reduced pressure. The crude residue was purified by normal phase chromatography (eluent: 0 to 25% EtOAc in c-hexane) to give the title compound as a light yellow gum. UPLC-MS-2a: Rt=1.01 min; MS m/z [M-Boc+H]+139.2.
To tert-butyl 4-cyano-2,2-dimethylpiperidine-1-carboxylate (Step 1, 2.00 g, 8.39 mmol) in THF (25.2 mL) at −78° C. under inert atmosphere was added dropwise LiHMDS (1M in THF, 16.8 mL, 16.8 mmol) followed after 1 h at −78° C. by a dropwise addition of a solution of ethyl chloroformate (1.61 mL, 16.8 mmol) in THF (1 mL). The reaction mixture was stirred for 1 h at −78° C. After complete conversion, the reaction mixture was poured into a sat. aq. NaHCO3 solution and extracted twice with EtOAc. The combined organic layers were washed with brine, dried (Na2SO4), filtered and concentrated under reduced pressure. The crude residue was purified by normal phase chromatography (eluent: 0 to 25% EtOAc in c-hexane) to give the title compound as a light yellow oil. UPLC-MS-2a: Rt=1.11 min; MS m/z [M-Boc+H]+211.3.
To an ice-cooled solution of 1-(tert-butyl) 4-ethyl 4-cyano-2,2-dimethylpiperidine-1,4-dicarboxylate (Step 2, 1.99 g, 6.40 mmol) in MeOH (10 mL) under inert atmosphere was added portionwise NaBH4 (0.29 g, 7.68 mmol). The reaction mixture was stirred at 0° C. for 30 min and at RT for 1 h. After complete conversion, the reaction mixture was cooled at 0° C. then diluted with TBME and water followed by addition of 4N HCl to adjust the pH around 2. The aqueous layer was extracted with TBME. The combined organic layers were washed with a sat. aq. solution of NaHCO3 then brine, dried (Na2SO4), filtered and concentrated under reduced pressure. The crude residue was purified by normal phase chromatography (eluent: 0 to 25% EtOAc in c-hexane) to give the title compound as a colorless oil. UPLC-MS-2a: Rt=0.92 min; MS m/z [M-Boc+H]+169.2.
To a solution of tert-butyl 4-cyano-4-(hydroxymethyl)-2,2-dimethylpiperidine-1-carboxylate (Step 3, 5.00 g, 18.6 mmol) in CH2Cl2 (30.2 mL) at 0° C. under inert atmosphere were added Et3N (3.10 mL, 22.4 mmol) and DMAP (0.11 g, 0.93 mmol), followed by a solution of p-toluenesulfonyl chloride (4.26 g, 22.4 mmol) in CH2Cl2 (20 mL). The reaction mixture was stirred at 0° C. for 1 h and at RT for 16 h then diluted with water and extracted with CH2Cl2. The organic layer was dried (Na2SO4), filtered and concentrated under reduced pressure. The crude residue was purified by normal phase chromatography (eluent: 0 to 40% EtOAc in c-hexane) to give the title compound as a colorless oil. UPLC-MS-4: Rt=1.22 min; MS m/z [M-Boc+H]+323.3.
To a solution of lithium aluminium hydride (1M in THF, 26.2 mL, 26.2 mmol) in THF (25.7 mL) at 0° C. under inert atmosphere was added dropwise a solution of tert-butyl 4-cyano-2,2-dimethyl-4-((tosyloxy)methyl)piperidine-1-carboxylate (Step 4, 7.39 g, 17.5 mmol) in THF (18.4 mL) and the reaction mixture was stirred at RT for 16 h. The reaction mixture was cooled at 0° C. and quenched carefully with water (1.80 mL), NaOH (15%, 1.80 mL), water (5.0 mL) and THF (30 mL). The mixture was stirred at 0° C. for 30 min, filtered, the filtered cake was washed with CH2Cl2. Then the filtrate was concentrated under reduced pressure. The residue was dissolved with CH2Cl2, dried (Na2SO4), filtered and concentrated under reduced pressure to give the title compound which was used without purification in the next step. UPLC-MS-4: Rt=0.43 min; MS m/z [M-Boc+H]+155.3.
To a solution of tert-butyl 6,6-dimethyl-2,7-diazaspiro[3.5]nonane-7-carboxylate (Step 5, 4.37 g, 17.0 mmol) in DCE (68.8 mL) was added oxetan-3-one (1.68 mL, 26.2 mmol) and the reaction mixture was stirred for 3 h. Then sodium triacetoxyborohydride (5.93 g, 28.0 mmol) was added and the reaction mixture was stirred at RT for 16 h. The RM was quenched with a sat. aq. NaHCO3 solution and extracted with CH2Cl2. The organic layer was dried (Na2SO4), filtered and concentrated under reduced pressure. The crude residue was purified by normal phase chromatography (eluent: 0 to 10% CH3OH in CH2Cl2) to give the title compound as a white solid. UPLC-MS-4: Rt=0.44 min; MS m/z [M-Boc+H]+211.3.
To a solution of tert-butyl 6,6-dimethyl-2-(oxetan-3-yl)-2,7-diazaspiro[3.5]nonane-7-carboxylate (Step 6, 3.65 g, 11.8 mmol) in CH2Cl2 (42.8 mL) was added TFA (13.6 mL, 176 mmol) and the reaction mixture was stirred at RT for 2 h. The RM was concentrated under reduced pressure, the residue was dissolved in dioxane, frozen and lyophilized to give the title compound as a TFA salt. The material was dissolved in MeOH (500 mL) and MP-carbonate (235 mmol, 80 g) was added. The mixture was swirled at RT for 1 h then was filtered, washed with MeOH and the filtrate was concentrated under reduced pressure to give the title compound as a colorless oil. UPLC-MS-4: Rt=0.13 min; MS m/z [M+H]+ 211.3.
The title compound was prepared in 7 steps by a method similar to that of 6,6-dimethyl-2-(oxetan-3-yl)-2,7-diazaspiro[3.5]nonane (Intermediate A67) using tert-butyl 8-oxo-5-azaspiro[3.5]nonane-5-carboxylate (Step 1) instead of tert-butyl 2,2-dimethyl-4-oxopiperidine-1-carboxylate. UPLC-MS-4: Rt=0.13 min; MS m/z [M+H]+ 223.3.
To a solution of 1-(tert-butoxycarbonyl)-2,2-dimethylpiperidine-4-carboxylic acid (20.0 g, 78.0 mmol) in THF (200 mL) was added CDI (15.1 g, 93.0 mmol) and the mixture was stirred at RT for 1 h under nitrogen atmosphere. The mixture was then cooled to 0° C., a solution of NaBH4 (5.29 g, 140 mmol) in Water (100 mL) was added and the reaction mixture was stirred at RT for 2 h. The reaction mixture was cooled to 0° C., AcOEt was added and a solution of aqueous HCl (0.5N) was added. The layers were separated and the organic layer was neutralized with a solution of aqueous NaOH (1N), extracted with EtOAc and the combined organic extracts were dried (phase separator) and concentrated under vacuum to give the title compound which was used without further purification in the next step. UPLC-MS-4: Rt=1.55 min; MS m/z [M−100]+ 144.1.
To a solution of tert-butyl 4-(hydroxymethyl)-2,2-dimethylpiperidine-1-carboxylate (Step 1, 1.20 g, 10.3 mmol) in CH2Cl2 (12 mL) at 0° C. under nitrogen atmosphere were added imidazole (0.67 g, 20.6 mmol) and tert-butyldiphenylsilyl chloride (1.50 mL, 12.3 mmol) and the reaction mixture was allowed to reach RT and stirred for 1.5 h. The reaction mixture was poured in water and extracted with EtOAc. The combined organic extracts were washed with water, brine, dried (Na2SO4), filtered and concentrated under vacuum to give the title compound which was used in the next step without further purification. 1H NMR (400 MHz, Chloroform-d) δ 7.67 (d, 4H), 7.51-7.32 (m, 6H), 3.66 (m, 1H), 3.51 (d, 2H), 3.26 (m, 1H), 1.98-1.80 (m, 2H), 1.70-1.59 (m, 2H), 1.48 (s, 9H), 1.4 (m 1H), 1.22 (s, 3H), 1.09 (s, 12H).
To a solution of tert-butyl 4-(((tert-butyldiphenylsilyl)oxy)methyl)-2,2-dimethylpiperidine-1-carboxylate (Step 2, 2.70 g, 5.61 mmol) in CH2Cl2 (27 mL) at 0° C. and under nitrogen atmosphere was added TFA (20 mL) and the reaction mixture was stirred at RT for 2 h. The RM was concentrated under vacuum, quenched with a sat. aq. solution of NaHCO3 and extracted with EtOAc. The combined organic extracts were washed with water, brine, dried (Na2SO4), filtered and concentrated under vacuum. The crude residue was purified by reverse phase chromatography (eluent: 55 to 65% CH3CN in H2O containing 0.025% NH3) to give the title product. UPLC-MS-5: Rt=1.89 min; MS m/z [M+H]+ 382.4.
To a solution of tert-butyl 4-(hydroxymethyl)-2,2-dimethylpiperidine-1-carboxylate (Step 1 in the synthesis of Intermediate A69, 17.2 g, 70.5 mmol) in CH2Cl2 (380 mL) under argon atmosphere was added at 0° C. Et3N (19.5 mL, 141 mmol) followed by Tosyl-Cl (14.1 g, 74.0 mmol). The reaction mixture was stirred at RT for 16 h. The reaction was poured in a sat. aq. NaHCO3 solution and extracted with CH2Cl2 (×2). The combined organic extracts were washed with brine, dried (phase separator) and concentrated. The crude residue was purified by normal phase chromatography (eluent: EtOAc in n-heptane 0 to 30%) to give the title compound. UPLC-MS-4: Rt=1.32 min; MS m/z [M−100+H]+298.2.
To morpholine (7.28 g, 84 mmol) were added a solution of tert-butyl 2,2-dimethyl-4-((tosyloxy)methyl)piperidine-1-carboxylate (Step 1, 23.7 g, 59.7 mmol) in DMF (250 mL) and Et3N (24.8 mL, 179 mmol) and the reaction mixture was stirred at 80° C. for 16 h. Water and EtOAc were added and the layers were separated. The organic layer was washed with brine and dried (Na2SO4), filtered and concentrated. The enantiomers were separated by chiral SFC (C-SFC-21; mobile phase: CO2/[MeOH+0.025% NH3]: 85/15) to give tert-butyl (S)-2,2-dimethyl-4-(morpholinomethyl)piperidine-1-carboxylate as the first eluting enantiomer; C-SFC-22 (mobile phase: CO2/[MeOH+0.05% DEA]95/5) Rt=2.14 min, UPLC-MS-4: Rt=0.46 min; MS m/z [M+H]+ 313.4 and tert-butyl (R)-2,2-dimethyl-4-(morpholinomethyl)piperidine-1-carboxylate as the second eluting enantiomer: C-SFC-22 (mobile phase: CO2/[MeOH+0.05% DEA] 95/5) Rt=2.77 min, UPLC-MS-4: Rt=0.46 min; MS m/z [M+H]+ 313.4.
To a solution of tert-butyl (R)-2,2-dimethyl-4-(morpholinomethyl)piperidine-1-carboxylate (Step 2 second eluting enantiomer, 6.89 g, 22.0 mmol) in dioxane (75 mL) was added HCl (4N in dioxane, 55 mL, 221 mmol) and the reaction mixture was stirred at RT for 16 h. After completion of the reaction, volatils were evaporated. The crude residue was dissolved in Methanol (150 mL), MP-Carbonate (26.8 g, 28.9 mmol) was added and the mixture was swirled at RT for 1 h. The mixture was filtered and the filtrate was concentrated and dried under high vacuum to give the title compound which was used in the next step without purification. 1H NMR (400 MHz, DMSO-d6) δ 3.55 (t, 4H), 2.80-2.74 (m, 2H), 2.33-2.24 (m, 4H), 2.06-2.01 (m, 2H), 1.04 (m, 1H), 1.65 (m, 1H), 1.53 (m, 1H), 1.09 (s, 6H), 0.95-0.83 (m, 2H).
Method-A70a: similar to Method-A70 except that NaI (0.5 eq.) was added in Step 2.
Method-A70b: similar to Method-A70 except that Step 2 was performed in CH3CN at 100° C. under microwave irradiations as described in the synthesis of Intermediate A78.
Method-A70c: similar to Method-A70 except that Step 3 was performed using TFA (10 eq.) in CH2Cl2 as described in the synthesis of Intermediate A78.
Method-A70d: similar to Method-A70 except that Step 2 was performed in CH3CN.
Method-A70e: similar to Method-A70 except that Step 2 was performed using NaH (60% in mineral oil) instead of Et3N.
The following examples A71 to A77 were prepared using analogous methods to method-A70 from commercially available precursors (in Step 2).
1H NMR (400 MHz, DMSO-d6) δ 3.55 (t, 4H), 2.80-2.74 (m, 2H), 2.33-2.24 (m, 4H), 2.06-2.01 (m, 2H), 1.04 (m, 1H), 1.65 (m, 1H), 1.53 (m, 1H), 1.09 (s, 6H), 0.95-0.83 (m, 2H).
To a solution of tert-butyl (R)-4-(hydroxymethyl)-2,2-dimethylpiperidine-1-carboxylate (Intermediate described In the synthesis of Intermediate A85 (Step 2), 26.8 g, 105 mmol) in CH2Cl2 (450 mL) under argon atmosphere was added at 0° C. Et3N (30.0 mL, 215 mmol) followed by Tosyl-Cl (21.0 g, 110 mmol). The reaction mixture was stirred at RT for 16 h. The reaction was poured in a sat. aq. NaHCO3 solution and extracted with CH2Cl2 (×2). The combined organic extracts were washed with brine, dried (phase separator) and concentrated. The crude residue was purified by normal phase chromatography (eluent: EtOAc in n-heptane 0 to 20%) to give the title compound. C-SFC-19 (mobile phase: CO2/[IPA+0.025% NH3] 85/15): Rt=2.56 min (note: Rt: 2.94 min for tert-butyl (S)-2,2-dimethyl-4-((tosyloxy)methyl)piperidine-1-carboxylate); UPLC-MS-4: Rt=1.32 min; MS m/z [M+H]+ 298.2.
To a solution of 1-(oxetan-3-yl)piperazine (0.76 g, 5.32 mmol) in CH3CN (16 mL) were added tert-butyl (R)-2,2-dimethyl-4-((tosyloxy)methyl)piperidine-1-carboxylate (Step 1, 2.10 g, 5.07 mmol) and Et3N (2.12 mL, 15.2 mmol). The reaction mixture was stirred at 100° C. under microwave irradiations for 15 h. The RM was poured into a sat. aq. NaHCO3 solution and extracted with CH2Cl2 (×3). The combined organic extracts were dried (phase separator) and concentrated. The crude residue was purified by normal phase chromatography (eluent: MeOH in CH2Cl2 from 0 to 15%) to give the title compound. UPLC-MS-4: Rt=0.48 min; MS m/z [M+H]+ 368.4.
To a solution of tert-butyl (R)-2,2-dimethyl-4-((4-(oxetan-3-yl)piperazin-1-yl)methyl)piperidine-1-carboxylate (Step 2, 1.52 g, 4.05 mmol) in CH2Cl2 (15 mL) was added TFA (3.12 mL, 40.5 mmol) and the reaction mixture was stirred at RT for 2 h. The RM was concentrated under reduced pressure. The crude residue was dissolved in MeOH (60 mL), MP-Carbonate (21 g, 60.7 mmol) was added and the mixture was swirled at RT for 1 h. The mixture was filtered and the filtrate was concentrated and dried under high vacuum to give the title compound which was used in the next step without purification. UPLC-MS-4: Rt=0.12 min; MS m/z [M+H]+ 268.4.
In a 200 mL autoclave was introduced tert-butyl 2,2-dimethyl-4-((tosyloxy)methyl)piperidine-1-carboxylate (Step 1 in the synthesis of Intermediate A70, 3.00 g, 7.56 mmol) and NH3 (7 M in MeOH, 27.0 mL, 189 mmol) and the reaction mixture at 85° C. for 48 h. The RM was concentrated to give the title compound as a white solid. UPLC-MS-4: Rt=0.52 min; MS m/z [M+H]+ 243.3.
To a stirred solution of tert-butyl 4-(aminomethyl)-2,2-dimethylpiperidine-1-carboxylate (Step 1, 3.27 g, 13.5 mmol) in EtOH (75 mL) was added under Argon divinyl sulfone (2.70 mL, 27.0 mmol) and NEt3 (3.76 mL, 27.0 mmol). The reaction mixture was stirred at 80° C. for 16 h. A sat. aq. NaHCO3 solution was added and the mixture was extracted with EtOAc (×2). The combined organic extracts were washed with a sat. aq. NaHCO3 solution, dried (Na2SO4), filtered and evaporated. The crude residue was purified by normal phase chromatography (eluent: EtOAc in c-hexane from 0 to 100%) to give the title compound as a white solid. UPLC-MS-4: Rt=0.91 min; MS m/z [M+H]+ 361.3.
To a stirred solution of tert-butyl 4-((1,1-dioxidothiomorpholino)methyl)-2,2-dimethylpiperidine-1-carboxylate (Step 2, 2.22 g, 6.16 mmol) in dioxane (25 mL) was added HCl (4N in dioxane, 15.4 mL, 61.6 mmol) and the reaction mixture was stirred at RT for 20 h. The RM was concentrated to dryness, dissolved in MeOH (30 mL), MP-carbonate (25.0 g, 18.6 mmol) was added and the mixture was stirred at 40° C. for 1 h. The mixture was filtered over a pad of celite and the filtrate was concentrated. The crude residue was purified by normal phase chromatography on basic Alumina (eluent: MeOH in CH2Cl2 from 0 to 10%) to give the title compound as a yellow oil. UPLC-MS-4: Rt=0.12 min; MS m/z [M+H]+ 261.3.
DMSO (620 μL, 8.73 mmol) was added dropwise under an inert atmosphere to a solution of oxalyl chloride (229 μL, 2.62 mmol) in CH2Cl2 (3.88 mL) at −78° C. and stirred for 10 mn, then tert-butyl 4-(hydroxymethyl)-2,2-dimethylpiperidine-1-carboxylate (Step 1 in the synthesis of Intermediate A69, 425 mg, 1.75 mmol) in CH2Cl2 (1.94 mL) was added and the mixture was stirred at −78° C. for 30 min, then triethylamine (1.46 mL, 10. mmol) was added dropwise and the reaction mixture was stirred at −78° C. for 1 h. The RM was quenched with water and extracted with CH2Cl2. The combined organic layers were dried (Na2SO4), filtered and concentrated under reduced pressure. The crude residue was purified by normal phase chromatography (eluent: 0 to 50% EtOAc in c-hexane) to give the title compound as a white solid. 1H NMR (400 MHz, DMSO-d6) δ 9.60 (d, 1H), 3.50-3.39 (m, 1H), 3.30-3.23 (m, 1H), 2.73-2.59 (m, 1H), 1.81-1.68 (m, 2H), 1.67-1.55 (m, 2H), 1.40 (s, 3H), 1.39 (s, 9H), 1.32 (s, 3H).
To a solution of 3-methoxyazetidine hydrochloride (151 mg, 1.22 mmol) in DCE (3 mL) under inert atmosphere was added triethylamine (0.17 mL, 1.22 mmol). After stirring for 30 min, tert-butyl 4-formyl-2,2-dimethylpiperidine-1-carboxylate (Step 2, 268 mg, 1.11 mmol) in DCE (1 mL) and MgSO4 (267 mg, 2.22 mmol) were added and the mixture was stirred at RT for 16 h. Sodium triacetoxyborohydride (377 mg, 1.78 mmol) was added and the reaction mixture was stirred at RT for 24 h. The RM was quenched with a sat. aq. NaHCO3 solution and extracted with CH2Cl2. The combined organic layer was dried (Na2SO4), filtered and evaporated. The crude residue was purified by normal phase chromatography (eluent: 0 to 15% CH3OH in CH2Cl2) to give the title compound as a colorless oil. UPLC-MS-4: Rt=0.43 min; MS m/z [M+H]+ 313.4.
To a solution of tert-butyl 4-((3-methoxyazetidin-1-yl)methyl)-2,2-dimethylpiperidine-1-carboxylate (Step 3, 312 mg, 1.00 mmol) in CH2Cl2 (3.70 mL) was added TFA (1.15 mL, 15.0 mmol) and the reaction mixture was stirred at RT for 5 h. The mixture was concentrated, the residue was dissolved in dioxane, frozen and lyophilized to give the title compound as a TFA salt. The material was dissolved in MeOH (40 mL), MP-carbonate (8 mmol, 2.8 g) was added and the mixture was swirled at RT for 1 h then was filtered, washed with MeOH and the filtrate was concentrated under reduced pressure to give the title compound as a colorless oil. UPLC-MS-4: Rt=0.22 min; MS m/z [M+H]+ 213.4.
To a solution of tert-butyl 4-formyl-2,2-dimethylpiperidine-1-carboxylate (described in the synthesis of Intermediate A80 (Step 1), 2.18 g, 8.70 mmol) in dichloroethane (21 mL) was added (1S,4S)-2-oxa-5-azabicyclo[2.2.1]heptane hydrochloride (1.53 g, 11.3 mmol) and the mixture was stirred at RT for 2 h. The mixture was then cooled to 0° C., NaBH(OAc)3 (2.77 g, 13.05 mmol) was added and RM was allowed to reach RT and stirred for 16 h. The RM was quenched with water, solid NaHCO3 was added and the mixture was extracted with EtOAc. The combined organic extracts were washed with brine, dried (Na2SO4), filtered and concentrated under vacuum to give the title product which was used in the next step without purification. UPLC-MS-4: Rt=0.40 min; MS m/z [M+H]+ 325.4.
To a solution of tert-butyl 4-(((1S,4S)-2-oxa-5-azabicyclo[2.2.1]heptan-5-yl)methyl)-2,2-dimethylpiperidine-1-carboxylate (Step 1, 2.30 g, 7.08 mmol) in CH2Cl2 (21 mL) at 0° C. was added HCl (4M in dioxane, 25 mL) and the reaction mixture was allowed to stir at RT for 3 h. Then the RM was concentrated under reduced pressure and the residue was dissolved in MeOH, tetraalkylammonium carbonate, polymer-bound (2 g) was added at 0° C. and the mixture was swirled at RT for 30 min, the filtered through Millipore and the filtrate was concentrated under vacuum. The crude residue was by normal phase chromatography on basic Alumina (eluent: 0 to 5% MeOH in CH2Cl2) to give the title product as yellow oil. UPLC-MS-4: Rt=0.21 min; MS m/z [M+H]+ 225.4.
To an ice-cooled solution of 1-(tert-butoxycarbonyl)-2,2-dimethylpiperidine-4-carboxylic acid (10.0 g, 38.9 mmol) in CH2Cl2 (194 mL) was added under inert atmosphere propylphosphonic anhydride (50% in EtOAc, 22.9 mL, 38.9 mmol) and DIPEA (26.6 mL, 155 mmol). After stirring at for 30 min, the mixture was added to a solution of 3-methoxyazetidine hydrochloride (5.76 g, 46.6 mmol) in CH2Cl2 (194 mL) at 0° C. The reaction mixture was stirred and warmed-up to RT over 20 h. The RM was quenched by addition of 1N HCl, then the organic phase was washed with 1N NaOH, dried (Na2SO4), filtered and evaporated under reduced pressure. The crude residue was purified by normal phase chromatography (eluent: 0 to 10% CH3OH in CH2Cl2) to give the title compound as a colorless oil. UPLC-MS-4: Rt=0.89 min; MS m/z [M-Boc+H]+227.3
To tert-butyl 4-(3-methoxyazetidine-1-carbonyl)-2,2-dimethylpiperidine-1-carboxylate (Step 1, 11.1 g, 33.9 mmol) in CH2Cl2 (126 mL) was added TFA (39.2 mL, 509 mmol) and the reaction mixture was stirred at RT for 5 h. The mixture was concentrated and the residue was dissolved with dioxane, frozen and lyophilized to give the title compound as a TFA salt. The material was dissolved in MeOH (1000 mL) and MP-carbonate (346 mmol, 110 g) was added. The mixture was swirled at RT for 1 h then was filtered and the filtrate was concentrated under reduced pressure to give the title compound as a light yellow oil. UPLC-MS-4: Rt=0.13 min; MS m/z [M+H]+ 227.3.
To a mixture of 1-(tert-butoxycarbonyl)-2,2-dimethylpiperidine-4-carboxylic acid (2.00 g, 7.77 mmol), and dimethylamine (2M in THF, 5.83 mL, 11.7 mmol), in DMA (20 mL) were added HATU (5.91 g, 15.5 mmol) and DIEA (3.33 mL, 19.4 mmol) and the reaction mixture was stirred at 25° C. for 1 h. Water (30 mL) was added and the RM was extracted EtOAc (×2). The combined organic extracts were washed with water, dried (Na2SO4), filtered and concentrated. The crude residue was purified by normal phase chromatography (eluent: MeOH in CH2Cl2 0 to 10%) to give the title compound. UPLC-MS-4: Rt=0.12 min; MS m/z [M+H]+ 285.3.
To a solution of tert-butyl 4-(dimethylcarbamoyl)-2,2-dimethylpiperidine-1-carboxylate (315 mg, 1.11 mmol) in dioxane (4 mL) was added HCl (4N in dioxane, 2.77 mL, 11.1 mmol) and the reaction mixture was stirred at RT. After completion of the reaction, the RM was evaporated to give the title compound as a hydrochloride salt which was used without purification in the next step. UPLC-MS-4: Rt=0.12 min; MS m/z [M+H]+ 185.3.
To a solution of 1-(tert-butoxycarbonyl)-2,2-dimethylpiperidine-4-carboxylic acid (2.50 g, 11.7 mmol) and (N)-methyl piperazine (1.75 g, 17.5 mmol) in DMF (25 mL) at RT were added sequentially EDC·HCl (3.30 g, 17.5 mmol) and HOBt (2.00 g, 15 mmol). The reaction mixture was stirred for 5 min, DIPEA (6.10 mL, 35.0 mmol) was added dropwise and the reaction mixture was stirred at RT for 16 h. The RM was quenched with a sat. aq. NaHCO3 solution and extracted with EtOAc. The combined organic extracts were washed with brine and dried (Na2SO4), filtered and concentrated under vacuum. The crude residue was purified by reverse phase chromatography (eluent: 0 to 50% CH3CN in water containing 0.1% NH3) to give the title compound. UPLC-MS-15: Rt=2.72 min, MS m/z [M+H]+ 340.2.
To a solution of tert-butyl 2,2-dimethyl-4-(4-methylpiperazine-1-carbonyl)piperidine-1-carboxylate (Step 1, 2.60 g, 7.70 mmol) in CH2Cl2 (25 mL) was added HCl (4M in dioxane, 10 mL) at 0° C. and the reaction mixture was allowed to reach RT and was stirred for 1 h. The RM was concentrated under vacuum, the crude residue was dissolved in MeOH (10 mL) and tetraalkylammonium carbonate resin (1.50 g) was added. The mixture was stirred for 15 min until reaction pH became basic and the mixture was filtered through a celite bed and the filtrate was concentrated to give the title compound. UPLC-MS-15: Rt=1.35 min, MS m/z [M+H]+ 240.2.
The enantiomers of 1-(tert-butoxycarbonyl)-2,2-dimethylpiperidine-4-carboxylic acid (500 g) were separated by chiral SFC to give the title compound as the second eluting enantiomer: C-SFC-43 (mobile phase: CO2/MeOH 85/20): Rt=3.17 min (note: Rt: 2.38 min for (S)-1-(tert-butoxycarbonyl)-2,2-dimethylpiperidine-4-carboxylic acid); UPLC-MS-4: Rt=0.94 min; MS m/z [M+H]− 256.2.
To a solution of (R)-1-(tert-butoxycarbonyl)-2,2-dimethylpiperidine-4-carboxylic acid (Step 1, 50.0 g, 194 mmol) in THF (500 mL) was added CDI (37.8 g, 233 mmol) and the mixture was stirred at 25° C. for 1 h. Then a solution of NaBH4 (13.2 g, 349 mmol) in H2O (250 mL) was added to the mixture at 0° C. and the reaction mixture was stirred at 25° C. for 16 h. The RM was cooled to 0° C. and then extracted twice with EtOAc. The organic layer was washed with HCl (1N, 200 mL), then washed with NaOH (1N, 200 mL), dried (Na2SO4), filtered and concentrated under reduced pressure. The crude residue was purified by normal phase chromatography (eluent: Petroleum ether/EtOAc from 1/0 to 0/1) to give the title compound as a colorless oil. UPLC-MS-4: Rt=0.94 min; MS m/z [M+H-Boc]+ 144.3.
To a solution of tert-butyl (R)-4-(hydroxymethyl)-2,2-dimethylpiperidine-1-carboxylate (Step 2, 130 g, 534 mmol) in CH2Cl2 (1.3 L) was added imidazole (72.7 g, 1.07 mol) and TBDPSCI (176 g, 641 mmol). The mixture was stirred at 25° C. for 12 h. After completion of the reaction, the reaction mixture was diluted with CH2Cl2 and washed with a sat. aq. NaHCO3 solution. The combined organic layers were dried (Na2SO4), filtered and concentrated under reduced pressure. The crude residue was purified by normal phase chromatography (eluent: Petroleum ether/EtOAc from 1/0 to 0/1) to give the title compound as a colorless oil. LCMS-19: Rt=1.26 min; MS m/z [M+H]+ 482.2; [M-Boc+H]+382.2.
To a solution of tert-butyl (R)-4-(((tert-butyldiphenylsilyl)oxy)methyl)-2,2-dimethylpiperidine-1-carboxylate (Step 3, 154 g, 319 mmol) in CH2Cl2 (1.54 L) was added TFA (307 mL, 4.16 mol). The reaction mixture was stirred at 25° C. for 1 h and then was concentrated under reduced pressure. The residue was triturated with MBTE (500 mL) and filtered to give a cake. The cake was dissolved in CH2Cl2 (500 mL), NaOH (2M, 250 mL) was added and the mixture was stirred at 25° C. for 5 h. The aqueous layer was separated and the organic layer was washed with H2O (500 mL) then dried (Na2SO4), filtered and concentrated under reduced pressure. The crude product was purified by normal phase chromatography (eluent: Petroleum ether/EtOAc from 1/1 to 0/1) to give the title compound as a colorless oil. LCMS-19: Rt=0.853 min; MS m/z [M+H]+ 382.2.
To a solution of 2-methylpropane-2-sulfinamide (55.0 g, 453.8 mmol) and 1-methoxypropan-2-one (47.98 g, 544.5 mmol) in THF (500 mL) was added dropwise titanium tetraethoxide (124.2 g, 544.5 mmol) at 0° C. and the reaction mixture was heated to 70° C. and stirred for 16 h. After completion of the reaction, the RM was diluted with EtOAc and poured into a sat. aq. NaHCO3 solution (800 mL) and stirred for 30 min. The mixture was filtered through a pad of celite and washed with hot EtOAc. The filtrate was dried (Na2SO4), filtered and concentrated under reduced pressure. The crude residue was purified by normal phase chromatography (eluent: 25 to 40% EtOAc in hexane) to give the title product. 1H NMR (400 MHz, CDCl3) δ 4.07 (s, 2H), 3.43 (s, 3H), 2.37 (s, 3H), 1.29 (s, 9H).
To a solution of LDA (2.0 M in THF/hexane, 102 mL, 203.9 mmol) at −78° C. was added dropwise under nitrogen atmosphere a solution of methyl acetate (15.1 g, 204 mmol) in THF (100 mL) and the reaction mixture was allowed to stir at −78° C. for 2 h. Then a solution of N-(1-methoxypropan-2-ylidene)-2-methylpropane-2-sulfinamide (Step 1, 19.5 g, 101.9 mmol) in THF (100 mL) was added dropwise and the RM was stirred for 1 h at −78° C. After completion of the reaction, the RM was quenched by addition at −78° C. of a sat. aq. NH4Cl solution and the resulting mixture was poured into ice-cold water and extracted with EtOAc. The combined organic extracts were washed with brine, dried (Na2SO4), filtered and concentrated under vacuum. The crude residue was purified by normal phase chromatography (eluent: 40 to 60% EtOAc in hexane) to give the title product as an orange Liquid. UPLC-MS-16: Rt=2.51 min, MS m/z [M+H]+ 266.
To a solution of methyl 3-((tert-butylsulfinyl)amino)-4-methoxy-3-methylbutanoate (Step 2, 29.0 g, 109.4 mmol) in MeOH (100 mL) at 0° C. was added HCl (2M in MeOH, 60 mL) and the reaction mixture was stirred at RT for 4 h. The solvent was evaporated, co-distilled with CH2Cl2 to afford a crude residue which was purified by Dowex resin (eluent: 2% methanolic ammonia in CH2Cl2) to give the title product as an orange liquid. UPLC-MS-16: Rt=1.61 min, MS m/z [M+H]+ 162.3.
To a solution of methyl 3-amino-4-methoxy-3-methylbutanoate (Step 3, 14.0 g, 86.9 mmol) in CH2Cl2 (140 mL) cooled to 0° C. was added dropwise Et3N (36.3 g, 261 mmol) followed by the addition dropwise of methyl malonyl chloride (23.6 g, 174 mmol). The reaction mixture was stirred at RT for 4 h. After completion of the reaction, volatils were evaporated and the residue was diluted with water and extracted with CH2Cl2. The combined organic extracts were washed with water, brine, dried (Na2SO4), filtered and concentrated under vacuum. The crude residue was purified by normal phase chromatography (eluent: 20 to 40% EtOAc in hexane) to give the title product as an orange oil. UPLC-MS-16: Rt=2.02 min, MS m/z [M+H]+ 262.2.
To a solution of methyl 4-methoxy-3-(3-methoxy-3-oxopropanamido)-3-methylbutanoate (Step 4, 16.0 g, 61.2 mmol) in MeOH (120 mL) at 0° C. was added a solution of NaOMe (25% in MeOH, 16.0 mL, 73.5 mmol) and the reaction mixture was slowly heated to 70° C. and stirred for 15 h. After completion of the reaction, the solvent was evaporated and the residue was diluted with water, acidified with aq. HCl to pH 3 and extracted with 10% iPrOH in CHCl3. The combined organic extracts were dried (Na2SO4), filtered and concentrated under vacuum to give the title product which was used in the next step without purification. UPLC-MS-12: Rt=6.82 min, MS m/z [M+H]+ 230.0.
A solution of methyl 6-(methoxymethyl)-6-methyl-2,4-dioxopiperidine-3-carboxylate (Step 5, 13.5 g, 58.9 mmol) in CH3CN (containing 1% water, 120 mL) was stirred at 70° C. for 24 h. After completion of the reaction, the solvent was evaporated, co-distilled with toluene and the resulting crude residue was purified by trituration in Et2O to give the title product as creamy solid. UPLC-MS-12: Rt=4.95 min, MS m/z [M+H]+ 172.2.
To a solution of 6-(methoxymethyl)-6-methylpiperidine-2,4-dione (6.60 g, 38.5 mmol) in MeOH (70 mL) at 0° C. was added portion wise NaBH4 (2.93 g, 77.1 mmol) and the reaction mixture was stirred at 0° C. for 1 h. After completion of the reaction, the RM was quenched by addition of a sat. aq. NH4Cl solution (10 mL) at 0° C., concentrated under vacuum and co-distilled with MeOH to afford a crude residue. The residue was diluted and stirred in CH2Cl2 (containing 5% MeOH) for 20 min and then filtered through a pad of celite. The filtrate was dried (Na2SO4), filtered and concentrated under vacuum to give the title product as a white solid. UPLC-MS-16: Rt=1.27 min, MS m/z [M+H]+ 174.0.
To a solution of 4-hydroxy-6-(methoxymethyl)-6-methylpiperidin-2-one (Step 7, 6.40 g, 36.9 mmol) in CH2Cl2 (150 mL) was added at 0° C. imidazole (7.54 g, 111 mmol) followed by portion wise addition of TBDPS-Chloride (17.2 g, 62.8 mmol). The reaction mixture was stirred at RT for 16 h. The white solid was filtered, washed with CH2Cl2 and the filtrate was washed with water, brine, dried (Na2SO4), filtered and concentrated. The crude residue was purified by normal phase chromatography (eluent: 20 to 50% EtOAc in hexane) to give the title product. UPLC-MS-9: Rt=1.59 min, [M+H]+=412.4.
To a solution of 4-((tert-butyldiphenylsilyl)oxy)-6-(methoxymethyl)-6-methylpiperidin-2-one (Step 8, 15.0 g, 36.4 mmol) in THF (150 mL) was added dropwise at −10° C. TMS-Chloride (18.6 g, 109.3 mmol) and reaction mixture was stirred for 1 h at −10° C. under a nitrogen atmosphere. Then, LiALH4 (1M in THF, 145 mL, 145 mmol) was added dropwise and the reaction mixture was stirred at −10° C. for 8 h. The RM was quenched by addition of aq. NaOH (2N) solution at 0° C. and extracted with EtOAc. The combined organic layers were dried (Na2SO4), filtered and concentrated under vacuum to give the title product, which was used in the next step without purification. UPLC-MS-6: Rt=1.71 min, MS m/z [M+H]+ 397.7.
To a solution of 4-((tert-butyldiphenylsilyl)oxy)-2-(methoxymethyl)-2-methylpiperidine (Step 9, 12.0 g, 30.2 mmol) in toluene (120 mL) was added NaHCO3 (8.87 g, 105.6 mmol) followed by the dropwise addition of benzylchloroformate (50% in toluene, 25.7 g, 75.5 mmol). The reaction mixture was stirred at 80° C. for 3 h. After completion of the reaction, the RM was poured into ice-water and extracted with EtOAc. The combined organic layers were washed with a sat. aq. NaHCO3 solution, brine, dried (Na2SO4), filtered and concentrated under vacuum. The crude residue was purified by normal phase chromatography (eluent: 0 to 2% EtOAc in hexane) to give the title product as an orange oil. UPLC-MS-13: Rt=3.14 & 3.22 min, MS m/z [M+H]+ 533.4.
To a solution of benzyl 4-((tert-butyldiphenylsilyl)oxy)-2-(methoxymethyl)-2-methylpiperidine-1-carboxylate (Step 10, 11.5 g, 22.3 mmol) in THF (150 mL) was added at 0° C. TBAF (1M in THF, 44.6 mL, 44.6 mmol) dropwise and the reaction mixture was stirred at RT for 8 h. After completion of the reaction, the RM was poured into ice-water and extracted with EtOAc. The combined organic layers were washed with water, brine, dried (Na2SO4), filtered and concentrated under vacuum to afford the title product which was used in the next step without purification. UPLC-MS-5: Rt=1.61 min & 1.63 min, MS m/z [M+H]+ 294.1.
To a solution of benzyl 4-hydroxy-2-(methoxymethyl)-2-methylpiperidine-1-carboxylate (Step 11, 6.00 g, 20.4 mmol) in CH2Cl2 (60 mL) was added molecular sieves. The mixture was cooled to 0° C. and N-methyl morpholine oxide (3.60 g, 30.7 mmol) was added followed by the portion wise addition of tetrapropylammonium perruthenate (0.35 g, 1.02 mmol) and the reaction mixture was stirred at RT for 15 min. After completion of the reaction, the RM was poured into ice-water and extracted with CH2Cl2. The combined organic layers were washed with water, brine, dried (Na2SO4), filtered and concentrated under vacuum. The crude residue was purified by normal phase chromatography (eluent: 15 to 25% EtOAc in hexane) to give the title product as an orange oil. UPLC-MS-9: Rt=1.25 min, [M+H]+ 292.4.
To a suspension of (methoxymethyl)triphenylphosphonium chloride (15.9 g, 46.3 mmol) in THF (50 mL) at −78° C. was added dropwise under a nitrogen atmosphere n-BuLi (2.5M in hexane, 21.7 mL, 54.1 mmol) and the mixture was stirred at −78° C. for 1 h. A solution of benzyl 2-(methoxymethyl)-2-methyl-4-oxopiperidine-1-carboxylate (Step 12, 4.50 g, 15.4 mmol) in THF (5 mL) was then added dropwise at −78° C. and the reaction mixture was allowed to reach RT and was stirred for 16 h. After completion of the reaction, the RM was poured onto ice-water and extracted with EtOAc. The combined organic layers were washed with water, brine, dried (Na2SO4), filtered and concentrated under vacuum. The crude residue was purified by normal phase chromatography (eluent: 6 to 8% EtOAc in hexane) to give the title product as an orange oil. UPLC-MS-9: Rt=1.43 min, [M+H]+ 320.2.
To a solution of benzyl-2-(methoxymethyl)-4-(methoxymethylene)-2-methylpiperidine-1-carboxylate (Step 13, 1.60 g, 5.0 mmol) in CH2Cl2/Water (2/1, 30 mL) was added trichloroacetic acid (8.20 g, 50.2 mmol) and reaction mixture was stirred at RT for 16 h. After completion of the reaction, the RM was poured into ice-water, neutralized at 0° C. with a sat. aq. NaHCO3 solution and extracted with EtOAc. The combined organic layers were washed with a sat. aq. NaHCO3 solution, brine, dried (Na2SO4), filtered and concentrated under vacuum. The crude residue was purified by normal phase chromatography (eluent: 8 to 15% EtOAc in hexane) to give the title product as an orange oil. UPLC-MS-16: Rt=3.39 min, 3.46 min, MS m/z [M+H]+ 306.0.
To a solution of benzyl 4-formyl-2-(methoxymethyl)-2-methylpiperidine-1-carboxylate (Step 14, 1.00 g, 3.28 mmol) in dichloroethane (10 mL) was added morpholine (0.37 g, 4.26 mmol) and mixture was allowed to stirr at RT for 2 h. The mixture was cooled to 0° C., NaBH(OAc)3 (1.73 g, 8.18 mmol) was added and the reaction mixture was stirred at RT for 6 h. After completion of the reaction, the RM was poured into ice-water, neutralized by addition of a sat. aq. NaHCO3 solution and extracted with EtOAc. The combined organic layers were washed with brine, dried (Na2SO4), filtered and concentrated under vacuum. The crude residue was purified by reverse phase chromatography (eluent: 55% CH3CN in water containing 0.1% NH3) to give the title product. UPLC-MS-16: Rt=3.52 min & 3.63 min, MS m/z [M+H]+ 377.3.
To a solution of benzyl 2-(methoxymethyl)-2-methyl-4-(morpholinomethyl)piperidine-1-carboxylate (Step 15, 1.10 g, 2.92 mmol) in iPrOH (11 mL) was added 10% Pd/C (0.3 g) and the reaction mixture was stirred at RT for 6 h under hydrogen atmosphere. The reaction mixture was filtered through a celite bed, washed with excess of EtOAc and the filtrate was concentrated under vacuum and co-distilled with toluene to give the title product. UPLC-MS-16: Rt=1.55 min, [M+H]+ 243.3.
The title compound was prepared in 16 steps by a method similar to that of (4-((2-(methoxymethyl)-2-methylpiperidin-4-yl)methyl)morpholine (Intermediate A86) using butan-2-one (Step 1) instead of 1-methoxypropan-2-one. UPLC-MS-16: Rt=1.63 min, MS m/z [M+H]+ 227.3.
To a solution of tert-butyl 2,2-dimethyl-4-oxopiperidine-1-carboxylate (1.50 g, 6.60 mmol) in THF (10 mL) under Argon at −78° C. was added LiHMDS (1M in THF, 6.60 mL, 6.60 mmol) under inert atmosphere and the reaction mixture was stirred at −78° C. for 20 min. Then a solution of 1,1,1-trifluoro-N-phenyl-N-((trifluoromethyl)sulfonyl)methanesulfonamide (2.36 g, 6.60 mmol) in THF (10 mL) was added at −78° C., and the RM was slowly warmed to RT and stirred for 16 h. The RM was quenched by addition of a sat. aq. NH4Cl solution and extracted with EtOAc. The combined organic extracts were washed with brine, dried (MgSO4), filtered and concentrated under vacuum. The crude residue was purified by normal phase chromatography (eluent: EtOAc in n-heptane 0 to 100%) to give the title compound. UPLC-MS-4: Rt=1.44 min; MS m/z [M+H-Boc]+260.1.
Tert-butyl 2,2-dimethyl-4-(((trifluoromethyl)sulfonyl)oxy)-3,6-dihydropyridine-1(2H)-carboxylate (Step 1, 1.28 g, 3.56 mmol), potassium trifluoro(morpholinomethyl)borate (1.11 g, 5.34 mmol), X-Phos (0.34 g, 0.71 mmol), Pd(OAc)2 (0.08 g, 0.36 mmol) and Cs2CO3 (3.48 g, 10.7 mmol) were suspended in dry dioxane (16 mL) under Argon. Then water (1.78 mL) was added and the reaction mixture was heated at 80° C. for 2.5 h. The reaction was quenched by addition of a sat. aq. NaHCO3 solution and extracted with EtOAc. The combined organic extracts were washed with brine and dried (MgSO4), filtered and concentrated under vacuum. The crude residue was purified by reverse phase chromatography (mobile phase: 0 to 70% [H2O containing 0.1% TFA] in CH3CN); to give the title compound. UPLC-MS-4: Rt=0.52 min; MS m/z [M+H]+ 311.4.
To a solution of tert-butyl 2,2-dimethyl-4-(morpholinomethyl)-3,6-dihydropyridine-1(2H)-carboxylate (Step 2, 600 mg, 1.93 mmol) in dioxane (9.65 mL) was added TFA (298 μl, 3.87 mmol) at RT and the reaction mixture was stirred at RT for 16 h. The mixture was evaporated to dryness, the crude residue was dissolved in methanol (10 mL), MP-carbonate (2.56 g, 7.73 mmol) was added and the mixture was swirled at 40° C. for 1 h. The mixture was filtered, the filtrate was concentrated under vacuum and the crude residue was purified by normal phase chromatography (basic alumina column, eluent: [CH2Cl2/MeOH: 80/20] in CH2Cl2 from 0 to 100%) to give the title compound. UPLC-MS-4: Rt=0.13 min; MS m/z [M+H]+ 211.3.
Di-tert-butyl dicarbonate (1.44 mL, 6.19 mmol) and triethylamine (2.35 mL, 16.9 mmol) were added to a solution of 5-methyl-2,5,7-triazaspiro[3.4]octan-6-one (1.00 g, 5.63 mmol) in THF (50 mL) and the reaction mixture was stirred at RT for 1 h. The reaction mixture was diluted with CH2Cl2, washed with a sat. aq. NaHCO3 solution and with brine. The organic layer was dried (Na2SO4), filtered and concentrated in vacuum. The crude residue was purified by normal phase chromatography (eluent: [CH2Cl2/MeOH: 80/20] in CH2Cl2 from 1 to 100%) to give the title compound. UPLC-MS-4: Rt=0.54 min; MS m/z [M+H]+ 242.2.
To a solution of tert-butyl 5-methyl-6-oxo-2,5,7-triazaspiro[3.4]octane-2-carboxylate (1.24 g, 5.15 mmol) in DMF (50 mL) at 0° C. under inert atmosphere, was added sodium hydride (50% in mineral oil, 412 mg, 10.3 mmol) and the reaction mixture was stirred at 0° C. for 10 min. Then methyl iodide (0.42 mL, 6.69 mmol) was added. After stirring for 1 h at 0° C., the reaction was complete. The RM was quenched with water, diluted with dichloromethane and washed with a sat. aq. NaHCO3 solution, water and brine. The organic layer was dried (Na2SO4), filtered and concentrated in vacuum. The crude residue was purified by normal phase chromatography (eluent: [CH2Cl2/MeOH: 80/20] in CH2Cl2 from 5 to 100%) to give the title compound. UPLC-MS-4: Rt=0.62 min; MS m/z [M+H]+ 256.2.
To a solution of tert-butyl 5,7-dimethyl-6-oxo-2,5,7-triazaspiro[3.4]octane-2-carboxylate (Step 2, 2.06 g, 8.07 mmol) in CH2Cl2 (20 mL) was added TFA (19.4 mL, 242 mmol) and the solution was stirred at RT for 15 min. The RM was evaporated to dryness, the crude was dissolved in methanol (40 mL), MP-Carbonate (7.0 g, 22.6 mmol) was added and the mixture was swirled at 40° C. for 1 h, then was filtered and the filtrate was concentrated under vacuum to give the title compound. UPLC-MS-4: Rt=0.12 min; MS m/z [M+H]+ 156.2.
To a solution of tert-Butyl 2,6-diazaspiro[3.4]octane-2-carboxylate (1.00 g, 4.71 mmol) in CH2Cl2 (47 mL) was added triethylamine (1.38 mL, 9.89 mmol). The solution was cooled to 0° C., methanesulfonyl chloride (0.40 mL, 5.18 mmol) was added dropwise at 0° C. and the reaction was allowed to reach RT and stirred at RT for 2.5 h. The RM was quenched with water and extracted with CH2Cl2. The organic layer was dried (Na2SO4), filtered and concentrated in vacuum. The crude residue was purified by normal phase chromatography (eluent: [CH2Cl2/MeOH: 80/20] in CH2Cl2 from 1 to 30%) to give the title compound. UPLC-MS-4: Rt=0.62 min; MS m/z [M+H-Boc]+191.1.
To a solution of tert-butyl 6-(methylsulfonyl)-2,6-diazaspiro[3.4]octane-2-carboxylate (Step 1, 1.50 g, 4.65 mmol) in CH2Cl2 (46 mL) was added TFA (11.2 mL, 139 mmol) and the solution was stirred at RT for 15 min. The RM was evaporated to dryness. The crude residue was suspended in diethylether (20 mL) and the solid was washed with diethylether and dried under vacuum. The residue was purified by normal phase chromatography (alumina column, eluent: [CH2Cl2/MeOH: 80/20] in CH2Cl2 from 5 to 100%) to give the title compound. UPLC-MS-4: Rt=0.13 min; MS m/z [M+H]+ 191.2.
To a solution of (R)-(1,4-dioxan-2-yl)methanol (87.0 mg, 0.70 mmol) in CH2Cl2 (3 mL) at 0° C. was added under argon triethylamine (0.20 mL, 1.40 mmol) followed by toluene-4-sulfonyl chloride (160 mg, 0.84 mmol) and the reaction mixture was stirred at RT for 16 h. The reaction mixture was quenched by addition of a sat. aq. NaHCO3 solution and extracted with EtOAc. The organic layer was washed with brine, dried (Na2SO4), filtered and evaporated to give the title compound which was used in the next step without purification. UPLC-MS-3: Rt=0.66 min; MS m/z [M+H]+ 273.2.
The title compound was prepared by a method similar to that of Intermediate B1 by replacing (R)-(1,4-dioxan-2-yl)methanol with (S)-(1,4-dioxan-2-yl)methanol (CAS [406913-93-7]). UPLC-MS-4: Rt=0.69 min; MS m/z [M+H]+ 273.1.
The title compound was prepared by a method similar to that of Intermediate B1 by replacing (R)-(1,4-dioxan-2-yl)methanol with (1,4-dioxepan-6-yl)methanol (CAS [1010836-47-1]). UPLC-MS-4: Rt=0.71 min; MS m/z [M+H]+ 287.2.
Methyl phenyl sulfone (1.00 g, 6.27 mmol) was dissolved in THF (8 mL) under Argon and cooled to 0° C. n-Butyllithium (1.6M in hexane, 8.20 mL, 13.2 mmol) was added dropwise and the reaction mixture was stirred for 30 min at 0° C. Diethyl chlorophosphate (1.40 mL, 9.41 mmol) was then added and the mixture was stirred for 30 min at 0° C. The RM was then cooled down to −78° C. and oxetan-3-one (0.42 mL, 6.27 mmol) was added. The RM was slowly allowed to reach RT and stirred for 1 h. The RM was quenched with water, diluted with a sat. aq. NaHCO3 solution and extracted with EtOAc (×2). The combined organic extracts were washed with brine, dried (Na2SO4), filtered and evaporated. The crude residue was purified normal phase chromatography (eluent: EtOAc in Heptane 0 to 60%). UPLC-MS-4: Rt=0.42 min; MS m/z [M+H]+ 211.1.
To a stirred solution of Dess-Martin Periodinane (623 mg, 1.47 mmol) and NaHCO3 (247 mg, 2.94 mmol) in CH2Cl2 (5 mL) was added under Argon (R)-tetrahydrofurfuryl alcohol (0.14 mL, 1.47 mmol) at 0° C. and the reaction mixture was stirred at RT for 1 h. The reaction mixture was filtered over celite and concentrated (water bath: 20° C.) to give the title compound which was used in the next step without purification. MS-1: MS m/z [M+H]+ 101.2.
To a solution of ethyl 1-hydroxycyclopropane-1-carboxylate (1.00 g, 6.92 mmol) and DHP (0.63 mL, 6.92 mmol) in CH2Cl2 (13 mL) was added pyridine 4-methylbenzenesulfonate (174 mg, 0.69 mmol) and the reaction mixture was stirred at RT for 3 h. The reaction mixture was evaporated and the residue was partitioned between Et2O and brine. The organic layer was dried (Na2SO4), filtered and concentrated in vacuo to give the title compound as a yellow oil. MS-1: MS m/z [M+H]+ 215.2.
To a solution of ethyl 1-((tetrahydro-2H-pyran-2-yl)oxy)cyclopropane-1-carboxylate (Step 1, 1.58 g, 7.01 mmol) in Et2O (35 mL) under a nitrogen atmosphere was added LiAlH4 (1M in Et2O, 7.01 mL, 7.01 mmol) at RT and the reaction mixture was refluxed for 1 h. The reaction mixture was cooled to RT and was quenched carefully with ice. The organic layer was separated and washed with water (×2), dried (Na2SO4), filtered and concentrated in vacuo to give the title compound as a yellow oil. MS-1: MS m/z [M+H]+ 173.2.
To a solution of oxalyl dichloride (0.38 mL, 4.35 mmol) in CH2Cl2 (18 mL) was added a solution of DMSO (1.44 mL. 20.3 mmol) in CH2Cl2 (3 mL) dropwise at −60° C. After 10 min, a solution of (1-((tetrahydro-2H-pyran-2-yl)oxy)cyclopropyl)methanol (Step 2, 500 mg, 2.90 mmol) in CH2Cl2 (10 mL) was added and the reaction mixture was stirred for 30 min. Then Et3N (2.02 mL, 14.5 mmol) was added and the reaction mixture was stirred for 2 h while slowly warming up to RT over time. The RM was diluted with CH2Cl2 and washed with water then brine. The organic layer was dried (Na2SO4), filtered and concentrated in vacuo to give the title compound as a yellow oil. 1H NMR (600 MHz, DMSO-d6) δ 9.42 (s, 1H), 4.69 (m, 1H), 3.86 (m, 1H), 3.44 (m, 1H), 1.77-1.65 (m, 2H), 1.55-1.43 (m, 4H), 1.40 (m, 1H), 1.33-1.27 (m, 2H), 1.20 (m, 1H).
To a solution of tert-butyl 6-hydroxy-2-azaspiro[3.3]heptane-2-carboxylate (CAS [1147557-97-8], 2.92 kg, 12.9 mmol) in CH2Cl2 (16.5 L) were added DMAP (316.1 g, 2.59 mol) and Tosyl-Cl (2.96 kg, 15.5 mol) at 20° C.-25° C. To the reaction mixture was added dropwise Et3N (2.62 kg, 25.9 mol) at 10° C.-20° C. The reaction mixture was stirred 0.5 h at 5° C.-15° C. and then was stirred 1.5 h at RT. After completion of the reaction, the reaction mixture was concentrated under vacuum. To the residue was added NaCl (5% in water, 23 L) followed by extraction with EtOAc (23 L). The combined aqueous layers were extracted with EtOAc (10 L×2). The combined organic layers were washed with NaHCO3 (3% in water, 10 L×2)) and concentrated under vacuum to give the title compound. 1H NMR (400 MHz, DMSO-d6) δ 7.81-7.70 (m, 2H), 7.53-7.36 (m, 2H), 4.79-4.62 (m, 1H), 3.84-3.68 (m, 4H), 2.46-2.38 (m, 5H), 2.26-2.16 (m, 2H), 1.33 (s, 9H). UPLC-MS-1a: Rt=1.18 min; MS m/z [M+H]+ 368.2.
To a solution of 3,4,5-tribromo-1H-pyrazole (55.0 g, 182.2 mmol) in anhydrous THF (550 mL) was added at −78° C. n-BuLi (145.8 mL, 364.5 mmol) dropwise over 20 min maintaining the internal temperature at −78° C./−60° C. The RM was stirred at this temperature for 45 min. Then the reaction mixture was carefully quenched with MeOH (109 mL) at −78° C. and stirred at this temperature for 30 min. The mixture was allowed to reach to 0° C. and stirred for 1 h. Then, the mixture was diluted with EtOAc (750 mL) and HCl (0.5 N, 300 mL) was added. The layers were separated and the organic layer was washed with brine (350 mL), dried (Na2SO4), filtered, and concentrated under vacuum. The crude residue was dissolved in CH2Cl2 (100 mL), cooled to −50° C. and petroleum ether (400 mL) was added. The precipitated solid was filtered and washed with n-hexane (250 mL×2) and dried under vacuum to give the title compound. 1H NMR (400 MHz, DMSO-d6) δ 13.5 (br s, 1H), 6.58 (s, 1H).
To a solution of tert-butyl 6-(tosyloxy)-2-azaspiro[3.3]heptane-2-carboxylate (Step 1, 900 g, 2.40 mol) in DMF (10.8 L) was added Cs2CO3 (1988 g, 6.10 mol) and 3,5-dibromo-1H-pyrazole (Step 2, 606 g, 2.68 mol) at 15° C. The reaction mixture was stirred at 90° C. for 16 h. The reaction mixture was poured into ice-water/brine (80 L) and extracted with EtOAc (20 L). The aqueous layer was re-extracted with EtOAc (10 L×2). The combined organic layers were washed with brine (10 L), dried (Na2SO4), filtered, and concentrated under vacuum. The residue was triturated with dioxane (1.8 L) and dissolved at 60° C. To the light yellow solution was slowly added water (2.2 L), and recrystallization started after addition of 900 mL of water. The resulting suspension was cooled down to 0° C., filtered, and washed with cold water. The filtered cake was triturated with n-heptane, filtered, then dried under vacuum at 40° C. to give the title compound. 1H NMR (400 MHz, DMSO-d6) δ 6.66 (s, 1H), 4.86-4.82 (m, 1H), 3.96-3.85 (m, 4H), 2.69-2.62 (m, 4H), 1.37 (s, 9H); UPLC-MS-2a: Rt=1.19 min; MS m/z [M+H]+ 420.0/422.0/424.0.
To a solution of tert-butyl 6-(3,5-dibromo-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Intermediate C3, 960 g, 2.30 mol) in THF (9.60 L) was added n-BuLi (1.2 L, 2.50 mol) dropwise at −80° C. under an inert atmosphere. The reaction mixture was stirred 10 min at −80° C. To the reaction mixture was then added dropwise iodomethane (1633 g, 11.5 mol) at −80° C. After stirring for 5 min at −80° C., the reaction mixture was allowed to warm up to 18° C. The reaction mixture was poured into a sat. aq. NH4Cl solution (4 L) and extracted with CH2Cl2 (10 L). The separated aqueous layer was re-extracted with CH2Cl2 (5 L) and the combined organic layers were concentrated under vacuum. The crude product was dissolved in 1,4-dioxane (4.8 L) at 60° C., then water (8.00 L) was added dropwise slowly. The resulting suspension was cooled to 17° C. and stirred for 30 min. The solid was filtered, washed with water, and dried under vacuum to give the title compound. 1H NMR (400 MHz, DMSO-d6) δ 6.14 (s, 1H), 4.74-4.66 (m, 1H), 3.95-3.84 (m, 4H), 2.61-2.58 (m, 4H), 2.20 (s, 3H), 1.37 (s, 9H); UPLC-MS-1a: Rt=1.18 min; MS m/z [M+H]+ 356.1/358.1.
To a stirred solution of tert-butyl 6-(3,5-dibromo-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Intermediate C3, 3.80 g, 80.0 mmol) at −78° C. in THF (500 mL) under Ar was added n-BuLi (1.6 M in hexane, 50.2 mL, 80.0 mmol). After 10 min at −78° C., the reaction mixture was quenched by addition of MeOH (30 mL), then was diluted with a sat. aq. NH4Cl solution and extracted with EtOAc (×2). The combined organic extracts were with a sat. aq. NaHCO3 solution, dried (Na2SO4), filtered and evaporated. The crude residue was purified by normal phase chromatography (eluent: EtOAc in c-hexane from 0 to 50%) to afford the title compound as a white solid. UPLC-MS-4: Rt=1.09 min; MS m/z [M+H]+ 342.1/344.1.
To a solution of 3-iodo-5-methyl-1H-pyrazole (340 g, 925 mmol) in DMA (3.4 L) was added Cs2CO3 (754 g, 2.31 mol) followed by tert-butyl 6-(tosyloxy)-2-azaspiro[3.3]heptane-2-carboxylate (Intermediate C2, 193 g, 925 mmol). The reaction mixture was stirred at 80° C. for 16 h. The reaction mixture was poured into water (3000 mL) and extracted with EtOAc (1000 mL×3). The combined organic layers were washed with brine (1 L×3), dried (Na2SO4), filtered and concentrated under vacuum to give a crude product as mixture of 2 regioisomers. The regioisomers were separated by normal phase chromatography (eluent: heptane/EtOAc from 8/1 to 5/1) to give isomer-1 as a white solid: UPLC-MS-1a: Rt=1.23 min; MS m/z [M+H]+ 404.1, and the title compound isomer-2 as a white solid. 1H NMR (400 MHz, DMSO-d6) δ 6.24-6.22 (m, 1H), 4.82-4.60 (m, 1H), 4.01-3.92 (m, 2H), 3.88-3.81 (m, 2H), 2.66-2.57 (m, 4H), 2.18 (s, 3H), 1.37 (s, 9H). UPLC-MS-1a: Rt=1.20 min; MS m/z [M+H]+ 404.1.
To a solution of tert-butyl 6-(3-iodo-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 1, 100 g, 248 mmol) in acetonitrile (1 L) was added NBS (53.0 g, 298 mmol) and the reaction mixture was stirred at RT for 3 h. The RM was diluted with EtOAc (1.5 L), washed with a sat. aq. NaHCO3 solution (1 L×3) then with brine (1 L), dried (Na2SO4), filtered and concentrated under vacuum. The residue was triturated with MTBE (200 mL), the solid was filtered, and dried under vacuum to give the title compound as a white solid. 1H NMR (400 MHz, CDCl3) δ 4.83-4.73 (m, 1H), 4.01-3.91 (m, 2H), 3.90-3.80 (m, 2H), 2.87-2.82 (m, 2H), 2.66-2.57 (m, 2H), 2.27 (s, 3H), 1.44 (s, 9H). UPLC-MS-1a: Rt=1.31 min; MS m/z [M+H]+ 482.1/484.1.
The title compound was prepared according to Mott, A. W.; barany, G. J. Chem. Soc. Perkin Trans. 1, 1984, 2615. Carbon disulfide (1.00 mL, 16.6 mmol) was added slowly to a solution of potassium t-butoxide (1.86 g, 16.6 mmol) in p-xylene (36 mL) at 75° C. The resulting yellow solid was collected by filtration, extensively washed with benzene and dried under vacuum to give a beige solid. This solid was suspended in Et2O (22 mL) and iodomethane (1.55 mL, 24.9 mmol) was added slowly. The reaction mixture was stirred for 18 h. Then was filtered and the precipitate was washed with Et2O. The filtrate was concentrated in a well ventilated hood (very unpleasant smelling) to give the title compound as a yellow oil. The compound was stored in the freezer to avoid decomposition. 1H NMR (400 MHz, CDCl3) δ 2.46 (s, 3H), 1.70 (s, 9H).
To a solution of 2-azaspiro[3.3]heptan-6-ol hydrochloride (2.05 g, 13.7 mmol) and imidazole (1.96 g, 28.8 mmol) in CH2Cl2 (30 mL) cooled to 0-5° C. was added portionwise tert-butyldimethylsilyl chloride (2.48 g, 16.5 mmol) under a nitrogen atmosphere. The reaction mixture was stirred at RT for 2 d. Then the RM was poured into a sat. aq. NaHCO3 solution and extracted with CH2Cl2 (×2). The combined organic extracts were washed with a sat. aq. NaHCO3 solution (×2), dried (phase separator) and concentrated in vacuo to give the title compound. 1H NMR (600 MHz, DMSO-d6) δ 4.06 (m, 1H), 3.48-3.30 (m, 5H), 2.40 (m, 2H), 1.86 (m, 2H), 0.83 (s, 9H), 0.00 (s, 6H).
To a solution of 6-((Tert-butyldimethylsilyl)oxy)-2-azaspiro[3.3]heptane-2-azaspiro[3.3] heptan-6-ol (Step 2, 1.60 g, 9.74 mmol) in pentane (6.5 mL) at 0-5° C. (ice-bath) was added O-(tert-butyl) S-methyl carbonodithioate (Step 1, 2.07 g, 8.19 mmol) and the reaction mixture was stirred at 0-5° C. for 1 h and then stirred at RT for 1 h. The reaction mixture was concentrated under reduced pressure and the crude residue was purified by normal phase chromatography (eluent: EtOAc in c-hexane 0 to 3%) to give the title compound as a beige solid. UPLC-MS-1a: Rt=1.63 min; MS m/z [M-tBu]+188.2.
The title compound was prepared according to David M. Hodgson, D.; Mortimer, C. L.; McKenna, J. M. Org. Lett. 2015, 17, 330. To a solution of O-(tert-butyl) 6-((tert-butyldimethylsilyl)oxy)-2-azaspiro[3.3]heptane-2-carbothioate (Step 3, 1.90 g, 5.53 mmol) in dry THF (28 mL) was added under argon at −75° C. TMEDA (2.00 mL, 13.3 mmol) followed by the dropwise addition of s-BuLi (1.4M in c-hexane, 6.71 mL, 9.40 mmol). The reaction mixture was stirred for 30 min at −75° C., iodomethane (1.04 mL, 16.6 mmol) was slowly added and the reaction mixture was stirred for 20 min at −75° C., then warmed to RT and further stirred for 1 h. The reaction mixture was poured into a sat. aq. NH4Cl solution, and extracted with EtOAc (×3). The combined organic extracts were washed with brine, dried (phase separator) and concentrated under reduced pressure to give the title compound which was used without further purification in the next step. UPLC-MS-1a: Rt=1.65 min; MS m/z [M-tBu]+302.3.
To a solution of O-(tert-butyl) 6-((tert-butyldimethylsilyl)oxy)-1-methyl-2-azaspiro[3.3]heptane-2-carbothioate (Step 4, 2.00 g, 5.59 mmol) in THF (35 mL) was added TBAF (1M in THF, 11.2 mL, 11.2 mmol) and the reaction mixture was stirred under nitrogen for 2 min. The reaction mixture was poured into a sat. aq. NaHCO3 solution and extracted with CH2Cl2 (×3). The combined organic extracts were dried (phase separator), concentrated in vacuo and the crude residue was purified by normal phase chromatography (eluent: EtOAc in c-hexane 20%) to give the title compound as a yellow oil. UPLC-MS-1a: Rt=0.96 min; MS m/z [M-tBu]+188.1.
To a solution of O-(tert-butyl) 6-hydroxy-1-methyl-2-azaspiro[3.3]heptane-2-carbothioate (Step 5, 1.12 g, 4.60 mmol) in CH2Cl2 (23 mL) under nitrogen atmosphere were added DMAP (0.73 g, 5.98 mmol) and Tosyl-Cl (1.05 g, 5.52 mmol) and the reaction mixture was stirred at RT for 14 h. The reaction mixture was poured into a sat. aq. NaHCO3 solution and extracted with CH2Cl2 (×2). The combined organic extracts were dried (phase separator) and evaporated. The crude residue was purified by normal phase chromatography (eluent: EtOAc in c-hexane 0 to 15%) to give the title compound as a white foam. The isomers were separated by chiral C-HPLC-4 (mobile phase: n-heptane/EtOH 70/30+0.05% DEA) to give the title compound Intermediate C6a as the first eluting peak: (C-HPLC-5 (mobile phase: n-heptane/EtOH 70/30+0.05% DEA) Rt=5.00 min), UPLC-MS-1a: Rt=1.34 min; MS m/z [M+H]+; 342.2, the title compound Intermediate C6b as the second eluting peak: (C-HPLC-5 (mobile phase: n-heptane/EtOH 70/30+0.05% DEA): Rt=5.52 min), UPLC-MS-1a: Rt=1.33 min; MS m/z [M+H]+ 342.2, the title compound Intermediate C6c as the third eluting peak: (C-HPLC-5 (mobile phase: n-heptane/EtOH 70/30+0.05% DEA): Rt=6.40 min), UPLC-MS-1a: Rt=1.33 min; MS m/z [M+H]+ 342.2 and the title compound Intermediate C6d as the fourth eluting peak: (C-HPLC-5 (mobile phase: n-heptane/EtOH 70/30+0.05% DEA): Rt=11.65 min), UPLC-MS-1a: Rt=1.34 min; MS m/z [M+H]+ 342.2.
To a solution of o-(tert-butyl) 1-methyl-6-(tosyloxy)-2-azaspiro[3.3]heptane-2-carbothioate (Intermediate C6c, 1.65 g, 4.15 mmol) in CH2Cl2 (20 mL) was added TFA (0.64 mL, 8.30 mmol) and the reaction mixture was stirred at RT for 2 h. TFA (0.64 mL, 8.30 mmol) was added and the RM was further stirred at RT for 1.5 h. The RM was concentrated under reduced pressure. The crude residue was dissolved in dioxane/water (ratio 1/1, 28 mL) and cooled to 0-5° C., NaHCO3 (2.09 g, 24.9 mmol) followed by (Boc)2O (4.82 mL, 20.75 mmol) were added and the RM was allowed to reach RT and stirred at RT for 1 h. The RM was poured into water and extracted with CH2Cl2 (×3). The combined organic layers were dried (phase separator) and concentrated. The crude residue was purified by normal phase chromatography (eluent: EtOAc in heptane from 0 to 60%) to give the title compound as a colorless oil. UPLC-MS-4: Rt=1.18 min; MS m/z [M+H-Boc]+282.2.
The title compound was prepared by a method similar to that of tert-butyl 1-methyl-6-(tosyloxy)-2-azaspiro[3.3]heptane-2-carboxylate (Intermediate C7) using o-(tert-butyl) 1-methyl-6-(tosyloxy)-2-azaspiro[3.3]heptane-2-carbothioate (Intermediate C6a) instead of Intermediate C6c. UPLC-MS-4: Rt=1.18 min; MS m/z [M+H-Boc]+282.2.
To tert-butyl 6-hydroxy-2-azaspiro[3.4]octane-2-carboxylate (1.00 g, 4.40 mmol) in CH2Cl2 (20 mL) under inert atmosphere were added DMAP (0.70 g, 5.72 mmol) and 4-toluenesulfonyl chloride (1.01 g, 5.28 mmol). The reaction mixture was stirred at RT for 16 h. The RM was poured into water and extracted twice with CH2Cl2. The combined organic phases were dried (Na2SO4), filtered and evaporated. The crude residue was purified by normal phase chromatography (eluent: EtOAc in c-hexane from 0 to 50%) to give the title compound as a colorless oil. UPLC-MS-1a: Rt=1.18 min; MS m/z [M+H]+ 382.4; [M+H-Boc]+282.3.
A solution of tert-butyl 3,3-dimethylpiperazine-1-carboxylate (CAS 259808-67-8, 2.70 kg, 10.7 mol) and tert-butyl 3-oxobutanoate (3.39 kg, 21.4 mol) in toluene (16.4 L) was stirred at 70° C. for 15 h. The reaction mixture was concentrated under vacuum to give a dark yellow oil. The crude product was purified by normal phase chromatography (eluent: EtOAc in n-heptane 0 to 50%) to give the title compound as a yellow oil. UPLC-MS-1a: Rt=0.85 min; MS m/z [M+H]+ 299.2.
A mixture of tert-butyl 3,3-dimethyl-4-(3-oxobutanoyl)piperazine-1-carboxylate (Step 1, 2.46 kg, 7.25 mol) and Lawesson's reagent (2,4-bis(4-methoxyphenyl)-1,3,2,4-dithiadiphosphetane-2,4-disulfide) (5.87 kg, 14.5 mol) in THF (61.5 L) was treated with hydrazine acetate (20.5 g, 14.5 mol) at 25-30° C. The reaction mixture was stirred at RT for 3 h. The reaction mixture was poured into ice-water (160 L). The separated aqueous layer was extracted with EtOAc (20.0 L×2). The combined organic layers were washed with saturated aqueous NaHCO3 solution (98.0 L×2) then with brine (98.0 L×2), dried (Na2SO4), filtered and concentrated under vacuum. The crude product was purified by normal phase chromatography (eluent: EtOAc in n-heptane 0 to 50%) to give the title compound as a gray solid. UPLC-MS-1a: Rt=0.93 min; MS m/z [M+H]+ 295.2.
To an ice-cooled solution of tert-butyl 3,3-dimethyl-4-(5-methyl-1H-pyrazol-3-yl)piperazine-1-carboxylate (Step 2, 340 g, 1.13 mol) in acetonitrile (6.80 L) was added NBS (230 g, 1.27 mol) portion wise at 0° C. After 5 min, the reaction was complete. The reaction mixture was diluted with EtOAc (13.6 L) and washed with ice water (13.6 L), 0.4M aqueous NaS2O3 solution (22.0 L), saturated aqueous NaHCO3 solution (22.0 L), then with brine (22.0 L×2). The combined aqueous layers were re-extracted with EtOAc (10.0 L). The combined organic layers were dried (Na2SO4), filtered, and concentrated under vacuum to give the title compound as a white solid which was used without purification in the next step. UPLC-MS-1a: Rt=1.18 min; MS m/z [M+H]+ 373.1/375.1.
To a solution of tert-butyl 4-(4-bromo-5-methyl-1H-pyrazol-3-yl)-3,3-dimethylpiperazine-1-carboxylate (Step 3, 324 g, 832 mmol) in CH2Cl2 (7.77 L) was added TFA (950 g, 8.30 mol) at 0° C. After completion of the reaction, the reaction mixture was concentrated under vacuum to give the title compound as a trifluoroacetate salt which was used without purification in the next step. UPLC-MS-1a: Rt=0.50 min; MS m/z [M+H]+ 273.0/275.0.
To a solution of 1-(4-bromo-5-methyl-1H-pyrazol-3-yl)-2,2-dimethylpiperazine as a trifluoroacetate salt (Step 4, 550 g, 832 mmol) in 1,4-dioxane (4.67 L)/water (4.67 L) was added K2CO3 (345 g, 2.50 mol) at 0° C. The reaction mixture was stirred at 0° C. for 30 min then acetic anhydride (128 g, 1.25 mol) was added. The resulting mixture was warmed up to 25° C. After completion of the reaction, the reaction mixture was quenched with cold water (1.00 L) and extracted with EtOAc (3.00 L×3). The combined organic layers were washed with saturated aqueous NaHCO3 solution (500 mL) then with brine (500 mL), dried (Na2SO4), filtered and concentrated under vacuum to give the title compound as a white solid. UPLC-MS-1a: Rt=0.78 min; MS m/z [M+H]+ 315.1/317.1.
To a solution of 1-(4-(4-bromo-5-methyl-1H-pyrazol-3-yl)-3,3-dimethylpiperazin-1-yl)ethan-1-one (Step 5, 230 g, 670 mmol) in dry DMF (3.20 L) was added tert-butyl 6-(tosyloxy)-2-azaspiro[3.3]heptane-2-carboxylate (Intermediate C2, 246 g, 670 mmol) and Cs2CO3 (540 g, 1.67 mol) at 25° C. then the reaction mixture was stirred at 80° C. under inert atmosphere for 16 h. The reaction mixture was cooled to 25° C. and diluted with water (12.8 L), then extracted with MTBE (2.00 L×4). The combined organic layers were washed with brine, dried (Na2SO4), filtered, and concentrated under vacuum to give a yellow oil. The crude product was purified by normal phase chromatography (eluent: EtOAc in n-heptane 0 to 50%) to give the title compound as a white solid. 1H NMR (600 MHz, DMSO-d6) δ 4.75-4.64 (m, 1H), 3.99-3.75 (m, 4H), 3.58-3.47 (m, 2H), 3.32-3.27 (m, 2H), 3.02-2.88 (m, 2H), 2.65-2.57 (m, 2H), 2.40-2.60 (m, 2H), 2.16 (s, 3H), 2.05 (s, 1.5H), 2.00 (s, 1.5H), 1.36 (s, 9H), 1.16 (s, 3H), 1.13 (s, 3H); UPLC-MS-1a: Rt=1.23 min; MS m/z [M+H]+ 510.2/512.2 .
Method-C10a: similar to Method-C10 except that in Step 3 AIBN (0.1 eq) was added to the reaction.
Method-C10b: similar to Method-C10 except that Step 6 was performed in DMA instead of DMF.
The following intermediates C12 and C13 were prepared using analogous methods to Method-C10 from intermediates commercially available (in Step 1).
The title compound was prepared using analogous methods to method-C10a Step 1-6 starting form tert-butyl piperazine-1-carboxylate. UPLC-MS-1a: Rt=0.64 min; MS m/z [M+H]+ 287.1/289.1.
To a stirred solution of 1-(4-(4-bromo-3-methyl-1H-pyrazol-5-yl)piperazin-1-yl)ethan-1-one (Intermediate C14, 2.40 g, 8.36 mmol) in ethylacetate (10 mL) were successively added Et3N (1.86 mL, 13.4 mmol) and methanesulfonyl chloride (0.98 mL, 12.5 mmol). The reaction mixture was stirred at Rt for 2 h. The RM was diluted with water (50 mL), extracted with EtOAc (×2) and the combined organic extracts were washed with water (×2). The water layers were extracted again with nBuOH and the combined organic extracts were dried and concentrated. The crude reside was purified by normal phase chromatography (eluent: (CH2Cl2+10% MeOH) in CH2Cl2 from 0 to 20%) to give the title compound. UPLC-MS-1a: Rt=0.78 min; MS m/z [M+H]+ 365.1/367.1.
To a mixture of 1-(4-(4-bromo-5-methyl-1-(methylsulfonyl)-1H-pyrazol-3-yl)piperazin-1-yl)ethan-1-one (1.64 g, 4.49 mmol), 5-chloro-1-(tetrahydro-2H-pyran-2-yl)-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-indazole (Intermediate D7, 1.95 g, 5.39 mmol), potassiumcarbonate (6.74 ml, 13.47 mmol) in dioxane (15 mL) was added RuPhos (0.21 g, 0.45 mmol) and Ruphos-Pd-G3 (0.39 g, 0.45 mmol). The reaction mixture was stirred under an argon atmosphere at 90° C. for 30 min. Water was added and the RM was extracted with EtOAc (×2). The combined organic extracts were washed with water, dried and concentrated. The crude residue was purified by normal phase chromatography (eluent: (CH2Cl2+10% MeOH) in CH2Cl2 from 0 to 20%) to give the title compound. UPLC-MS-1a: Rt=1.01, 1.02 min; MS m/z [M+H]+ 521.5/523.5.
A solution of 1-(4-(4-(5-chloro-1-(tetrahydro-2H-pyran-2-yl)-1H-indazol-4-yl)-5-methyl-1-(methylsulfonyl)-1H-pyrazol-3-yl)piperazin-1-yl)ethan-1-one (Step 2, 1.57 g, 3.01 mmol) in dioxane (15 mL) and sodium hydroxide (2M, 4.52 mL, 9.04 mmol) was stirred at 90° C. for 45 min. The RM was diluted with EtOAc (10 mL) and washed a 5% bicarbonate solution and with water (×2). The combined water layers were extracted with nBuOH and the combined organic layers were dried (Na2SO4), filtered and evaporated to give the title compound which was used without further purification in the nest step. UPLC-MS-1a: Rt=0.89, 0.90 min; MS m/z [M+H]+ 443.5/445.5.
To a solution of 3-bromo-5-methyl-1H-pyrazole (6.00 g, 37.3 mmol) in THF (180 ml) under nitrogen atmosphere was added NaH (60% in grease, 3.73 g, 93.0 mmol) at 0° C. and the mixture was stirred for 1 h. SEMCI (9.25 mL, 52.2 mmol) was added dropwise and the RM was stirred at 0° C. for 30 min, then allowed to reach RT and was further stirred for 16 h. The reaction mixture was quenched with water and extracted with EtOAc (3×). The combined organic layers were dried (phase separator) and concentrated under reduced pressure. The crude residue was purified by normal phase chromatography (eluent: EtOAc in heptane from 0 to 10%) to give the title compound as a mixture of 2 regioisomers (yellow oil). UPLC-MS-4: Rt=1.36 and 1.40 min; MS m/z [M+H]+ 291.1/293.1.
In an ace tube were added 3-bromo-5-methyl-1-((2-(trimethylsilyl)ethoxy)methyl)-1H-pyrazole (Step 1 mixture of 2 regioisomers, 9.38 g, 32.2 mmol), (S)-1-benzyl-3-ethyl-3-methylpiperazine (Intermediate A32, 4.69 g, 21.5 mmol), Pd(dba)2 (0.93 g, 1.61 mmol), bis(3,5-bis(trifluoromethyl)phenyl)(2′,6′-bis(dimethylamino)-3,6-dimethoxybiphenyl-2-yl)phosphine (CAS [1810068-30-41], 1.22 g, 1.61 mmol). The tube was placed under nitrogen atmosphere and dioxane (100 mL) followed by NaOtBu (2M in THF, 16.1 mL, 32.2 mmol) were added. The reaction mixture was heated at 85° C. for 16 h. To complete the reaction, Pd(dba)2 (0.93 g, 1.61 mmol), bis(3,5-bis(trifluoromethyl)phenyl)(2′,6′-bis(dimethylamino)-3,6-dimethoxybiphenyl-2-yl)phosphine (1.22 g, 1.61 mmol) and NaOtBu (2M in THF, 16.1 mL, 32.2 mmol) were added again and the RM was further stirred at RT for 16 h. The RM was poured into an aq. sat. NaHCO3 solution and extracted with CH2Cl2 (×3). The combined organic layers were dried (phase separator) and concentrated under reduced pressure. The crude residue was purified twice by normal phase chromatography (1-using a RediSep cartridge and eluting with: EtOAc in heptane from 0 to 50%, 2-using a RediSep GOLD cartridge and eluting with: EtOAc in heptane from 0 to 20) to give the title compound as a single regioisomer (orange oil). 1H NMR (400 MHz, DMSO-d6) δ 7.32-7.34 (m, 5H), 5.66 (s, 1H), 5.19 (s, 2H), 3.50-3.38 (m, 4H), 3.15-2.99 (m, 2H), 2.42 (m, 2H), 2.31 (m, 1H), 2.19 (s, 3H), 2.07-1.95 (m, 2H), 1.42-1.33 (m, 1H), 1.13 (s, 3H), 0.79 (t, 2H), 0.66 (t, 3H), 0.07 (s, 9H); UPLC-MS-4: Rt=1.16 min; MS m/z [M+H]+ 229.1.
A solution of (S)-4-benzyl-2-ethyl-2-methyl-1-(5-methyl-1-((2-(trimethylsilyl)ethoxy)methyl)-1H-pyrazol-3-yl)piperazine (Step 2, 3.59 g, 8.38 mmol) in EtOAc (100 mL) and AcOH (4.80 mL, 84 mmol) was evacuated and back-filled with nitrogen (×3) before the addition of Pd/C (10%, 1.47 g, 1.38 mmol). The mixture was evacuated and back-filled again with nitrogen (×2) then evacuated and back-filled with hydrogen (×3) and the RM was stirred at RT under an atmosphere of hydrogen (ballon) for 24 h. The RM was filtered over a pad of celite, washed with EtOAc and the filtrate was concentrated. The crude residue was dissolved in CH2Cl2, a sat. aq. NaHCO3 solution was added and the 2 layers were separated. The aqueous layer was back-extracted with CH2Cl2 and the combined organic extracts were dried (phase separator) and concentrated. The crude residue was purified by normal phase chromatography (eluent: CH2Cl2/MeOH 8/2 in CH2Cl2 from 0 to 100%) to give the title compound. UPLC-MS-4: Rt=0.81 min; MS m/z [M+H]+ 339.1.
To a solution of (S)-2-ethyl-2-methyl-1-(5-methyl-1-((2-(trimethylsilyl)ethoxy)methyl)-1H-pyrazol-3-yl)piperazine (Step 3, 3.68 g, 10.9 mmol) in CH3CN (90 mL) was added under argon (S)-(1,4-dioxan-2-yl)methyl 4-methylbenzenesulfonate (Intermediate B1, 4.44 g, 16.3 mmol), triethylamine (4.54 mL, 32.6 mmol) and NaI (1.63 g, 10.9 mmol) and the reaction mixture was stirred at 80° C. for 48 h. The reaction mixture was diluted with a sat. aq. NaHCO3 solution, extracted with EtOAc (×3) and the combined organic extracts were washed with brine, dried (Na2SO4), filtered and evaporated. The crude residue was purified by normal phase chromatography (eluent: EtOAc in n-heptane 0 to 100%). UPLC-MS-4: Rt=0.87 min; MS m/z [M+H]+ 439.6.
To an ice-cooled solution of (S)-4-(((R)-1,4-dioxan-2-yl)methyl)-2-ethyl-2-methyl-1-(5-methyl-1-((2-(trimethylsilyl)ethoxy)methyl)-1H-pyrazol-3-yl)piperazine (Step 4, 3.65 g, 8.33 mmol) in THF (80 mL) was added NBS (1.63 g, 9.16 mmol) and the mixture was stirred under N2 atmosphere at 0° C. After completion (30 min), the reaction mixture was concentrated and the crude residue was purified by normal phase chromatography (eluent: EtOAc in n-heptane 0 to 50%). UPLC-MS-4: Rt=1.05 min; MS m/z [M+H]+ 517.4/519.4.
To a mixture of (S)-4-(((R)-1,4-dioxan-2-yl)methyl)-1-(4-bromo-5-methyl-1-((2-(trimethylsilyl)ethoxy)methyl)-1H-pyrazol-3-yl)-2-ethyl-2-methylpiperazine (Step 5, 6.72 g, 3.48 mmol), 5-chloro-6-methyl-1-(tetrahydro-2H-pyran-2-yl)-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-indazole (Intermediate D1, 3.80 g, 10.1 mmol), RuPhos (0.31 g, 0.72 mmol) and RuPhos-Pd-G3 (0.56 g, 0.67 mmol) in dioxane (65 mL) was added K3PO4 (2 M in water, 10.1 mL, 20.2 mmol) and the reaction mixture was stirred at 85° C. for 2 h under nitrogen atmosphere. The reaction mixture was poured into a sat. aq. NaHCO3 solution and extracted with EtOAc (×3). The combined organic extracts were dried (Na2SO4), filtered and concentrated. The crude residue was diluted with THF (25 mL), SiliaMetS®Thiol (2.67 mmol) was added and the mixture swirled for 1 h at 40° C. The mixture was filtered, the filtrate was concentrated and the crude residue was purified by normal phase chromatography (eluent: EtOAc in n-heptane 0 to 100%) to give the title compound as a yellow foam. UPLC-MS-4: Rt=1.21 min; MS m/z [M+H]+ 687.8/689.8.
To a solution of 4-(3-((S)-4-(((R)-1,4-dioxan-2-yl)methyl)-2-ethyl-2-methylpiperazin-1-yl)-5-methyl-1-((2-(trimethylsilyl)ethoxy)methyl)-1H-pyrazol-4-yl)-5-chloro-6-methyl-1-(tetrahydro-2H-pyran-2-yl)-1H-indazole (Step 6, 4.52 g, 5.79 mmol) in THF (58 mL) was added TBAF (1 M in THF, 57.9 mL, 57.9 mmol) and the reaction mixture was stirred at 60° C. for 72 h. The reaction mixture was poured into a sat. aq. NH4Cl solution and extracted with EtOAc (×3). The combined organic extracts were washed with a sat. aq. NaHCO3 solution (×2), dried (phase separator) and concentrated. The crude residue was purified by normal phase chromatography (eluent: (CH2Cl2/MeOH 8/2) in CH2Cl2 from 0 to 10%) to give the title compound. UPLC-MS-4: Rt=0.82 and 0.83 min; MS m/z [M+H]+ 557.5/559.5.
The title compound was prepared using analogous method to method-C16 (Step 2) using (R)-1-((2,2-dimethylpiperidin-4-yl)methyl)-4-(oxetan-3-yl)piperazine (Intermediate A78) and toluene as the solvent. UPLC-MS-4: Rt=0.78 min; MS m/z [M+H]+ 478.6.
The title compound was prepared using analogous method to method-C16 (Step 5) starting from (R)-1-((2,2-dimethyl-1-(5-methyl-1-((2-(trimethylsilyl)ethoxy)methyl)-1H-pyrazol-3-yl)piperidin-4-yl)methyl)-4-(oxetan-3-yl)piperazine (Step 1) and using NIS in CH3CN instead of NBS in THF. UPLC-MS-4: Rt=1.05 min; MS m/z [M+H]+ 604.3.
The title compound was prepared using analogous method to method-C16 (Step 6) starting from (R)-1-((1-(4-iodo-5-methyl-1-((2-(trimethylsilyl)ethoxy)methyl)-1H-pyrazol-3-yl)-2,2-dimethylpiperidin-4-yl)methyl)-4-(oxetan-3-yl)piperazine (Step 2) and 5,6-dichloro-1-(tetrahydro-2H-pyran-2-yl)-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-indazole (intermediate D6) using toluene as the solvent. UPLC-MS-4: Rt=1.22 min; MS m/z [M+H]+ 746.6/748.6.
The title compound was prepared using analogous method to method-C16 (Step 7) starting from 5,6-dichloro-4-(3-((R)-2,2-dimethyl-4-((4-(oxetan-3-yl)piperazin-1-yl)methyl)piperidin-1-yl)-5-methyl-1-((2-(trimethylsilyl)ethoxy)methyl)-1H-pyrazol-4-yl)-1-(tetrahydro-2H-pyran-2-yl)-1H-indazole (Step 3). UPLC-MS-4: Rt=0.81, 0.82 and 0.86 min; MS m/z [M+H]+ 616.4/618.4.
To tert-butyl 6-(3,5-dibromo-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Intermediate C3, 100 mg, 0.24 mmol) and potassium cyclopropyltrifluoroborate (42.2 mg, 0.28 mmol) in dioxane (1.0 mL) were added under inert atmopshere Pd(Ph3P)4 (27.4 mg, 0.024 mmol) and Na2CO3 (2 M in H2O, 249 μl, 0.50 mmol). The reaction mixture was degassed with N2 and stirred at 95° C. for 16 h. More potassium cyclopropyltrifluoroborate (42.2 mg, 0.285 mmol), Pd(Ph3P)4 (27.4 mg, 0.024 mmol) and Na2CO3 (2 M in H2O, 249 μl, 0.499 mmol) were added. The reaction mixture was stirred at 95° C. for 4 h. After cooling at RT, the reaction mixture was treated with sat. aq. NaHCO3 solution, extracted twice with EtOAc and the combined organic phases were dried (Na2SO4), filtered and concentrated in vacuo. The crude residue was purified by normal phase chromatography (eluent: EtOAc in c-hexane from 0 to 40%) to give the title compound as a white gum. UPLC-MS-2a: Rt=1.25 min; MS m/z [M+H]+ 382.1/384.1.
To a mixture of tert-butyl 6-(3-bromo-5-cyclopropyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 1, 307 mg, 0.80 mmol), 1-(3,3-dimethylpiperazin-1-yl)ethan-1-one (Intermediate A13, 163 mg, 1.04 mmol), Pd(dba)2 (46.2 mg, 0.08 mmol) and bis(3,5-bis(trifluoromethyl)phenyl)(2′,6′-bis(dimethylamino)-3,6-dimethoxybiphenyl-2-yl)phosphine (66.8 mg, 0.09 mmol) suspended in 1,4-dioxane (4 mL) was added NaOtBu (2 M in THF, 562 μl, 1.12 mmol). The reaction mixture was stirred at 85° C. for 16 h. The RM was treated with a sat. aq. NaHCO3 solution, extracted with CH2Cl2 and the organic layers were dried (Na2SO4), filtered and concentrated in vacuo. The crude residue was purified by normal phase chromatography (eluent: MeOH in CH2Cl2 from 0 to 5%) to give the title compound as a yellow gum. UPLC-MS-2a: Rt=1.11 min; MS m/z [M+H]+ 458.3.
6-(3-Bromo-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Intermediate C1, 720 mg, 1.92 mmol) and 1-(piperazin-1-yl)ethan-1-one (497 mg, 3.84 mmol) were dissolved in 1,4-dioxane (12.0 mL) under Ar and degassed. NaOtBu (2M in THF, 2.88 mL, 5.76 mmol) followed by tBuXPhos-Pd-G3 (157 mg, 0.19 mmol) were added and the reaction mixture was stirred at 90° C. for 17 h. The reaction mixture was diluted with a sat. aq. NaHCO3 solution and extracted with EtOAc. The combined organic layers were washed with brine, dried (Na2SO4), filtered and concentrated in vacuo. The crude residue was purified by normal phase chromatography (eluent: EtOAc in n-heptane 50 to 100%) to give the title compound as a foam. UPLC-MS-1a: Rt=0.98 min; MS m/z [M+H]+ 404.3.
Under Ar, to a solution of tert-butyl 6-(3-(4-acetylpiperazin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 1, 380 mg, 0.93 mmol) in EtOAc (10.0 mL) was added NIS (281 mg, 1.21 mmol) and the reaction mixture was stirred at RT for 30 mi. The reaction mixture was diluted with a 10% aq. sodium thiosulfate solution and extracted with EtOAc. The combined organic layers were washed with brine, dried (Na2SO4), filtered and concentrated in vacuo to give the title compound as an off white solid. UPLC-MS-1a: Rt=1.16 min; MS m/z [M+H]+ 530.2.
Method-C19a: similar to Method-C19 except that in Step 3 NBS was used instead of NIS to give the corresponding 4.bromo pyrrazole.
The following intermediates C20 to C22 were prepared using analogous methods to method-19 from intermediates described in the intermediates synthesis section or commercially available (in Step 1).
The title compound was prepared using analogous method to method-C19a (Step 1) and 2 starting form 1-(3-methylpiperazin-1-yl)ethan-1-one. The enantiomers were separated by chiral SFC (C-HPLC-19; mobile phase: n-heptane/EtOH/MeOH (85/7.5/7.5)+0.05% DEA) to give the first eluting enantiomer of the title compound: Intermediate C23a; C-HPLC-20 (mobile phase: heptane/[EtOH:MeOH (50:50)+0.05% DEA]: 85/15): Rt=2.84 min, UPLC-MS-1a: Rt=1.17 min; MS m/z [M+H]+ 496.3/498.3 and the second eluting isomer of the title compound: Intermediate C23b: C-HPLC-20 (mobile phase: heptane/[EtOH:MeOH (50:50)+0.05% DEA]: 85/15): Rt=4.59 min, UPLC-MS-1a: Rt=1.17 min; MS m/z [M+H]+ 496.3/498.3.
To a solution of tert-butyl 6-(4-bromo-3-iodo-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Intermediate C5, 500 mg, 1.04 mmol) in THF (6.90 mL) was added 3-(pyrrolidin-3-yl)pyridine (184 mg, 1.24 mmol), tBuXPhos-Pd-G3 (82 mg, 0.104 mmol) and then phosphazene base P2Et [CAS [165535-45-5], 0.69 mL, 2.07 mmol). The reaction mixture was stirred at RT for 64 h. The RM was quenched with water, extracted twice with EtOAc. The combined organic layers were dried (Na2SO4), filtered and evaporated. The crude residue was purified by normal phase chromatography (eluent: MeOH in CH2Cl2 from 0 to 5%) and the enantiomers were separated by chiral SFC (C-SFC-2; mobile phase: CO2/[CH3OH+0.025% NH3]: 70/30) to give the first eluting enantiomer of the title compound: Intermediate C24a; C-SFC-11 (mobile phase: CO2/[CH3OH+0.025% NH3]: 70/30): Rt=2.34 min, UPLC-MS-1a: Rt=1.28 min; MS m/z [M+H]+; 502.2/504.2 and the second eluting enantiomer of the title compound: Intermediate C24b: C-SFC-11 (mobile phase: CO2/[CH3OH+0.025% NH3]: 70/30): Rt=3.04 min, UPLC-MS-1a: Rt=1.28 min; MS m/z [M+H]+ 502.2/504.2.
In an ACE tube, to a mixture of tert-butyl 6-(3-bromo-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Intermediate C1, 950 mg, 2.67 mmol), (3aS*,7aS*)-2-methyloctahydro-1H-pyrrolo[3,4-c]pyridin-1-one (Intermediate A58 racemic, 432 mg, 2.80 mmol), tBuXPhos-Pd-G3 (212 mg, 0.27 mmol) in THF (19 mL) was added Phosphazene P2-Et (CAS [165535-45-5], 2.66 mL, 8.00 mmol). The reaction mixture was flushed with argon and stirred at 85° C. for 18 h. The reaction mixture was poured into water and extracted with CH2Cl2 (×3). The combined organic extracts were dried over (phase separator) and concentrated in vacuo. The crude residue was purified by normal phase chromatography (eluent: MeOH in CH2Cl2 from 0 to 5%) to give the title compound. The isomers were separated by chiral SFC (C-SFC-2; mobile phase: CO2/[MeOH+0.025% NH3] 85/15) to give Intermediate C25a as the first eluting peak: UPLC-MS-2a: Rt=0.98 min; MS m/z [M+H]+ 430.3, C-SFC-3 (mobile phase: CO2/[MeOH+0.025% NH3] 85/15): Rt=1.66 min and Intermediate C25b as the second eluting peak: UPLC-MS-2a: Rt=0.98 min; MS m/z [M+H]+ 430.3, C-SFC-3 (mobile phase: CO2/[MeOH+0.025% NH3] 85/15): Rt=2.54 min.
To a solution of (trans)-1-methyloctahydro-2H-pyrrolo[3,2-c]pyridin-2-one (Intermediate A59, 1.10 g, 6.80 mmol) and tert-butyl 6-(3-bromo-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Intermediate C1, 2.42 g, 6.80 mmol) in anhydrous toluene (190 mL) under nitrogen atmosphere was t-BuXPhos-Pd-G3 (0.81 g, 1.02 mmol) and the mixture was degassed with nitrogen for 5 min before the addition of NaOtBu (2M in THF, 10.7 mL, 21.4 mmol). The reaction mixture was stirred at 80° C. in a screw capped vial for 16 h. After completion of the reaction, the RM was diluted with EtOAc and filtered thorough a pad of celite, the filtrate was concentrated under vacuum and the crude residue was purified normal phase chromatography (eluent: 0 to 7% MeOH in CH2Cl2) to give the title product. UPLC-MS-5: Rt=1.62 min, MS m/z [M+H]+ 430.4.
To a solution of tert-butyl 6-(5-methyl-3-((trans)-1-methyl-2-oxooctahydro-5H-pyrrolo[3,2-c]pyridin-5-yl)-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 1, 1.97 g, 4.60 mmol) in CH3CN (40 mL) was added at −4° C., AIBN (0.08 g, 0.460 mmol) followed by NIS (1.14 g, 5.05 mmol) and the reaction mixture was stirred at −4° C. for 2 h. After completion of reaction, the RM was quenched by adding a sat. aq. NaHCO3 solution at −40° C. and the mixture was extracted with EtOAc. The combined organic layer was washed with brine, dried (Na2SO4), filtered and concentrated under vacuum. The crude residue was purified by normal phase chromatography (eluent: 0 to 7% MeOH in CH2Cl2) to give the title product. The isomers were separated by chiral SFC (C-SFC-2; mobile phase: CO2/IPA 65/35) to give Intermediate C26a as the first eluting peak: UPLC-MS-2a: Rt=1.14 min; MS m/z [M+H]+ 556.1, C-SFC-3 (mobile phase: CO2/IPA 65/35): Rt=1.00 min and Intermediate C26b and as the second eluting peak: UPLC-MS-2a: Rt=1.14 min; MS m/z [M+H]+ 556.1, C-SFC-3 (mobile phase: CO2/IPA 65/35): Rt=2.34 min.
A solution of tert-butyl 6-(3-bromo-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Intermediate C1, 2.00 g, 5.61 mmol) and benzyl 8,8-dimethyl-1-oxa-4,9-diazaspiro[5.5]undecane-4-carboxylate (Intermediate A64, 2.32 g, 7.30 mmol) in toluene (50 mL) was degassed with nitrogen for 10 min and 2-[bis(3,5-trifluoromethylphenylphosphino)-3,6-dimethoxy]-2′,6′-di-i-propoxy-1,1′-biphenyl (CAS [1810068-31-5], 0.47 g, 0.61 mmol), Pd(dba)2 (0.26 g, 0.46 mmol) followed by NaOtBu (2 M in THF, 5.05 mL, 10.1 mmol) were added sequentially and the reaction mixture was stirred at 85° C. for 3 h in a sealed tube. After completion of reaction, the RM was quenched with water, extracted with EtOAc (×2), the combined organic layer was washed with a sat. aq. NaHCO3 solution, with brine, dried (Na2SO4), filtered and concentrated. The crude residue was purified by normal phase chromatography on neutral aluminum oxide (eluent: 0.5-1% MeOH in CH2Cl2) followed by reverse phase chromatography (eluent: 45% CH3CN in H2O containing 0.1% NH3) to give the title compound. UPLC-MS-5: Rt=1.70 min; MS m/z [M+H]+ 594.7.
To a slurry of 10% Pd/C (1.20 g) in MeOH (20 mL) was added a solution of benzyl 9-(1-(2-(tert-butoxycarbonyl)-2-azaspiro[3.3]heptan-6-yl)-5-methyl-1H-pyrazol-3-yl)-8,8-dimethyl-1-oxa-4,9-diazaspiro[5.5]undecane-4-carboxylate (Step 1, 2.00 g, 3.36 mmol) in MeOH (40 mL) and the mixture was stirred at RT under hydrogen atmosphere for 3 h. After completion of the reaction, the RM was filtered through a pad of celite and washed with Methanol. The filtrate was concentrated under reduced pressure and the crude residue was purified by reverse phase chromatography (eluent: 60% CH3CN in H2O containing 0.025% NH3) to give the title compound. UPLC-MS-5: Rt=1.38 min; MS m/z [M+H]+ 460.5.
To a solution of tert-butyl 6-(3-(8,8-dimethyl-1-oxa-4,9-diazaspiro[5.5]undecan-9-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 2, 1.35 g, 2.93 mmol) in MeOH (30 mL) was added paraformaldehyde (0.18 g, 5.87 mmol) and mixture was cooled to 0° C. NaBH3CN (0.18 g, 2.93 mmol) was added portion wise and resulting reaction mixture was stirred at 50° C. for 1 h. After completion of the reaction, the RM was cooled to RT, filtered through a pad of celite and washed with EtOAc. The filtrate was concentrated under reduced pressure and the crude residue was purified by reverse phase chromatography (eluent: 60% CH3CN in H2O containing 0.025% NH3) to give the title compound. UPLC-MS-5: Rt=1.43 min; MS m/z [M+H]+ 474.87.
To a solution of tert-butyl 6-(5-methyl-3-(4,8,8-trimethyl-1-oxa-4,9-diazaspiro[5.5]undecan-9-yl)-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 3, 1.20 g, 2.61 mmol) in CH3CN (24 mL) at 0° C. under nitrogen atmosphere was added NIS (0.62 g, 2.74 mmol) portion wise and the reaction mixture was stirred at 0° C. for 10 min. After completion of the reaction, the RM was quenched with cold water and extracted with CH2Cl2. The combined organic layer was washed with brine, dried (Na2SO4), filtered and concentrated. The crude residue was purified by reverse phase chromatography (eluent: 80% CH3CN in H2O containing 0.025% NH3) to give the title compound. The enantiomers were separated by chiral SFC (C-SFC-47; mobile phase: CO2/[IPA/CH3CN (50/50)+0.1% Et2NH] 85/15) to give Intermediate C27a as the first eluting enantiomer: UPLC-MS-5: Rt=1.69 min; MS m/z [M+H]+ 600.3, C-SFC-48 (mobile phase: CO2/[IPA/CH3CN (50/50)+0.1% Et2NH]85/15): Rt=2.57 min and Intermediate C27b as the second eluting enantiomer: UPLC-MS-5: Rt=1.69 min; MS m/z [M+H]+ 600.3, C-SFC-48 (mobile phase: CO2/[IPA/CH3CN (50/50)+0.1% Et2NH]85/15): Rt=3.46 min.
Under inert atmosphere, to a stirred solution of tert-butyl 6-(3-bromo-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Intermediate C1, 11.0 g, 30.9 mmol), 2-(trimethylsilyl)ethyl 5,8-diazaspiro[3.5]nonane-8-carboxylate (Intermediate A30, 9.19 g, 34.0 mmol), bis(3,5-bis(trifluoromethyl)phenyl)(2′,6′-bis(dimethylamino)-3,6-dimethoxybiphenyl-2-yl)phosphine (CAS: [1810068-30-4], 1.19 g, 1.58 mmol), and Pd(dba)2 (888 mg, 1.54 mmol) in 1,4-dioxane (100 mL) was added NaOtBu (2M solution in THF, 21.6 mL, 43.2 mmol). The reaction mixture was placed in a preheated oil bath (85° C.) and stirred at 85° C. for 2 h. The RM was quenched with a sat. aq. NaHCO3 solution and extracted with EtOAc (×2). The combined organic layers were washed with a sat. aq. NaHCO3 solution, dried (Na2SO4), filtered and concentrated under vacuum. The crude residue was purified by normal phase chromatography (eluent: EtOAc in cyclohexane 0 to 47%) to give the title compound as a brown solid. UPLC-MS-2a: Rt=1.40 min; MS m/z [M+H]+ 546.3.
Under inert atmosphere, to a stirred solution of 2-(trimethylsilyl)ethyl 5-(1-(2-(tert-butoxycarbonyl)-2-azaspiro[3.3]heptan-6-yl)-5-methyl-1H-pyrazol-3-yl)-5,8-diazaspiro[3.5]nonane-8-carboxylate (Step 1, 17.0 g, 31.1 mmol) in THF (150 mL) was added NIS (7.36 g, 32.7 mmol) at 0° C. and the reaction mixture was stirred at RT for 16 h. The reaction was quenched with a sat. aq. NaHCO3 solution and extracted with EtOAc (×2). The combined organic layers were washed with a sat. aq. NaHCO3 solution, dried (Na2SO4), filtered and concentrated under vacuum. The crude residue was purified by normal phase chromatography (eluent: EtOAc in c-hexane 0 to 37%) to give the title compound as a white solid. UPLC-MS-2a: Rt=1.49 min; MS m/z [M+H]+ 672.3.
Under inert atmosphere, to a stirred solution of 2-(trimethylsilyl)ethyl 5-(1-(2-(tert-butoxycarbonyl)-2-azaspiro[3.3]heptan-6-yl)-4-iodo-5-methyl-1H-pyrazol-3-yl)-5,8-diazaspiro[3.5]nonane-8-carboxylate (Step 2, 20.5 g, 30.5 mmol), 5-chloro-6-methyl-1-(tetrahydro-2H-pyran-2-yl)-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-indazole (Intermediate D1, 13.8 g, 36.6 mmol) and K3PO4 (19.4 g, 91.0 mmol) in a mixture of 1,4-dioxane (100 mL) and water (25.0 mL) were added RuPhos (1.42 g, 3.05 mmol) and RuPhos-Pd-G3 (2.55 g, 3.05 mmol). The reaction mixture placed in a preheated oil batch (80° C.) and was stirred at 80° C. for 1 h. The RM was quenched with a sat. aq. NaHCO3 solution and extracted with EtOAc (×2). The combined organic layers were washed with a sat. aq. NaHCO3 solution, dried (Na2SO4), filtered and concentrated under vacuum. The residue was taken up in CH2Cl2, Si-TMT (CAS [1226494-16-1], 3.50 mmol) was added and the mixture was swirled at 40° C. for 1 h. The mixture was filtered and the filtrate was concentrated under vacuum. The crude residue was purified by normal phase chromatography (eluent: EtOAc in c-hexane 0 to 47%) to give the title compound as a yellow solid. UPLC-MS-2a: Rt=1.48 min; MS m/z [M+H]+ 794.6.
Under inert atmosphere, to a stirred solution of 2-(trimethylsilyl)ethyl 5-(1-(2-(tert-butoxycarbonyl)-2-azaspiro[3.3]heptan-6-yl)-4-(5-chloro-6-methyl-1-(tetrahydro-2H-pyran-2-yl)-1H-indazol-4-yl)-5-methyl-1H-pyrazol-3-yl)-5,8-diazaspiro[3.5]nonane-8-carboxylate (Step 3, 26.8 g, 33.7 mmol) in THF (150 mL) was added TBAF (1M in THF, 84.0 mL, 84.0 mmol). The reaction mixture was stirred at RT for 20 h. The RM was quenched with a sat. aq. NH4Cl solution and extracted with EtOAc (×2). The combined organic layers were washed with a sat. aq. NaHCO3 solution, dried (Na2SO4), filtered and concentrated under vacuum. The crude residue was purified by normal phase chromatography (eluent: EtOAc 100% then MeOH in CH2Cl2 0 to 10%) to give the title compound as a yellow solid. UPLC-MS-2a: Rt=1.08 min; MS m/z [M+H]+ 650.5/652.5.
The title compound was prepared by a method similar to Method-C28-A (Step 1) using 8-benzyl-5,8-diazaspiro[3.5]nonane (Intermediate A31) instead of 2-(trimethylsilyl)ethyl 5,8-diazaspiro[3.5]nonane-8-carboxylate (Intermediate A30). The title compound was obtained as a brown gum after normal phase chromatography (eluent: EtOAc in n-heptane 0 to 60%). UPLC-MS-2a: Rt=0.96 min; MS m/z [M+H]+ 492.4.
The title compound was prepared by a method similar to Method-C28-A (Step 2) by replacing 2-(trimethylsilyl)ethyl 5-(1-(2-(tert-butoxycarbonyl)-2-azaspiro[3.3]heptan-6-yl)-5-methyl-1H-pyrazol-3-yl)-5,8-diazaspiro[3.5]nonane-8-carboxylate with tert-butyl 6-(3-(8-benzyl-5,8-diazaspiro[3.5]nonan-5-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Protocol B, Step 1). The title compound was obtained as a white foam after normal phase chromatography (eluent: EtOAc in n-heptane 0 to 60%). UPLC-MS-2a: Rt 1.06 min; MS m/z [M+H]+ 618.3.
The title compound was prepared by a method similar to Method-C28-A (Step 3) by replacing 2-(trimethylsilyl)ethyl 5-(1-(2-(tert-butoxycarbonyl)-2-azaspiro[3.3]heptan-6-yl)-4-iodo-5-methyl-1H-pyrazol-3-yl)-5,8-diazaspiro[3.5]nonane-8-carboxylate with tert-butyl 6-(3-(8-benzyl-5,8-diazaspiro[3.5]nonan-5-yl)-4-iodo-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Protocol B, Step 2). The title compound was obtained as a white foam after normal phase chromatography (eluent: EtOAc in n-heptane 0 to 50%). UPLC-MS-2a: Rt 1.16 min; MS m/z [M+H]+ 740.5/742.5.
Tert-butyl 6-(3-(8-benzyl-5,8-diazaspiro[3.5]nonan-5-yl)-4-(5-chloro-6-methyl-1-(tetrahydro-2H-pyran-2-yl)-1H-indazol-4-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 3, 100 mg, 0.11 mmol) was dissolved in EtOAc:AcOH 10:1 (4.40 mL) and 10% Pd/C (23 mg) was added. The reaction mixture was placed under a pressure of hydrogen (5 bars) and stirred at RT for 20 h. The RM was filtered through a celite pad, washed with EtOAc, and the filtrate was washed twice with a sat. aq. NaHCO3 solution then with brine. The separated organic layer was dried (Na2SO4), filtered, and concentrated under vacuum. The crude residue was purified by normal phase chromatography (eluent: MeOH in CH2Cl2 0 to 12%) to give the title compound. UPLC-MS-2a: Rt=1.08 min; MS m/z [M+H]+ 650.5/652.5.
TBAF (8.54 mL, 8.54 mmol) was added to a solution of 2-(trimethylsilyl)ethyl 5-(1-(2-(tert-butoxycarbonyl)-2-azaspiro[3.3]heptan-6-yl)-5-methyl-1H-pyrazol-3-yl)-5,8-diazaspiro[3.5]nonane-8-carboxylate (Intermediate prepared in Method-C28-A (Step 1), 2.05 g, 3.42 mmol) in THF (11 mL). After stirring at RT overnight, the reaction mixture was filtered and concentrated under reduced pressure. The residue was diluted with EtOAc, washed with a sat. aq. NaHCO3 solution and brine, dried (Na2SO4) and concentrated under reduced pressure. The crude residue was purified by normal phase chromatography (eluent: EtOAc in c-hexane 0 to 30%) to give the title compound. UPLC-MS-3: Rt=0.71 min; MS m/z [M+H]+ 402.4.
LiClO4 (1.76 g, 16.6 mmol) was added to a solution of tert-butyl 6-(5-methyl-3-(5,8-diazaspiro[3.5]nonan-5-yl)-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 1, 900 mg, 1.66 mmol) and 2,2-dimethyloxirane (2.96 mL, 33.2 mmol) in DMF (12 mL). After stirring for 1 h at 60° C., the reaction mixture was filtered and concentrated under reduced pressure. The residue was diluted with EtOAc, washed with a sat. aq. NaHCO3 solution and brine, dried (Na2SO4), filtered and concentrated under reduced pressure. The crude residue was purified by normal phase chromatography (eluent: EtOAc in c-hexane 0 to 30%) to give the title compound. UPLC-MS-3: Rt=0.75 min; MS m/z [M+H]+ 474.4.
The title compound was prepared by a method similar to Method-C28-A using 2-(trimethylsilyl)ethyl 3,3-diethylpiperazine-1-carboxylate (intermediate A40) instead of 2-(trimethylsilyl)ethyl 5,8-diazaspiro[3.5]nonane-8-carboxylate (intermediate A30) in Step 1. UPLC-MS-2a: Rt=1.08 min; MS m/z [M+H]+ 666.6/668.6.
The title compound was prepared by a method similar to Method-C28-A except that Step 3 was performed in toluene instead of dioxane using 2-(trimethylsilyl)ethyl 6,9-diazaspiro[4.5]decane-9-carboxylate (intermediate A41) instead of 2-(trimethylsilyl)ethyl 5,8-diazaspiro[3.5]nonane-8-carboxylate (intermediate A30) in Step 1. UPLC-MS-3: Rt=1.07 min; MS m/z [M+H]+ 664.4/666.5.
The title compound was prepared by a method similar to Method-C28-A using 5-chloro-6-fluoro-1-(tetrahydro-2H-pyran-2-yl)-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-indazole (Intermediate D9) instead of 5-chloro-6-methyl-1-(tetrahydro-2H-pyran-2-yl)-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-indazole (Intermediate D1) in Step 3. UPLC-MS-2a: Rt=1.07 min; MS m/z [M+H]+: 654.4/656.5.
The title compound was prepared by a method similar to Method-C28-A using 5,6-dichloro-1-(tetrahydro-2H-pyran-2-yl)-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-indazole (intermediate D6) instead of 5-chloro-6-methyl-1-(tetrahydro-2H-pyran-2-yl)-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-indazole (Intermediate D1) in Step 3. UPLC-MS-2a: Rt=1.11 min; MS m/z [M+H]+: 670.5/672.4/674.5.
The title compound was prepared by a method similar to Method-C28-A from 2-(trimethylsilyl)ethyl 3,3-dimethylpiperazine-1-carboxylate (intermediate A43) and using 5,6-dichloro-1-(tetrahydro-2H-pyran-2-yl)-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-indazole (intermediate D6) instead of intermediate D1 in Step 3 and heating the reaction mixture at 40° C. in Step 4. UPLC-MS-4: Rt=1.13 min; MS m/z [M+H]+ 658.3/660.3/662.3.
The title compound was prepared by a method similar to Method-C28-A (Step 2-4) from tert-butyl (S)-6-(3-(2-ethyl-2-methyl-4-((2-(trimethylsilyl)ethoxy)carbonyl)piperazin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (intermediate C67) and using 5,6-dichloro-1-(tetrahydro-2H-pyran-2-yl)-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-indazole (intermediate D6) instead of intermediate D1 in Step 3. Step 3 was carried out using tetrakis(triphenylphosphine)palladium and the reaction mixture was stirred at 80° C. for 4 h. UPLC-MS-4: Rt=1.12 min; MS m/z [M+H]+ 672.5/674.4/676.5.
Intermediate C36a: Tert-butyl 6-(4-(5-chloro-6-methyl-1-(tetrahydro-2H-pyran-2-yl)-1H-indazol-4-yl)-3-((4aS*,7aS*)-hexahydrofuro[3,4-b]pyrazin-1(2H)-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate Isomer 1 The title compound was prepared by a method similar to Method-C28-A (Step 2-4) using 2-(trimethylsilyl)ethyl (4aS*,7aS*)-4-(1-(2-(tert-butoxycarbonyl)-2-azaspiro[3.3]heptan-6-yl)-5-methyl-1H-pyrazol-3-yl)hexahydrofuro[3,4-b]pyrazine-1 (2H)-carboxylate Isomer 1 (described below). UPLC-MS-2a: Rt=1.04 min; MS m/z [M+H]+ 652.5/654.5.
The title compound was prepared by a method similar to Method-C28-A (Step 2-4) using 2-(trimethylsilyl)ethyl (4aS*,7aS*)-4-(1-(2-(tert-butoxycarbonyl)-2-azaspiro[3.3]heptan-6-yl)-5-methyl-1H-pyrazol-3-yl)hexahydrofuro[3,4-b]pyrazine-1(2H)-carboxylate Isomer 2 (described below). UPLC-MS-3: Rt=1.04 min; MS m/z [M+H]+ 652.2/654.4.
The title compound was prepared by a method similar to Method-C28-A (Step 1) using 2-(trimethylsilyl)ethyl (4aS*,7aS*)-hexahydrofuro[3,4-b]pyrazine-1(2H)-carboxylate (Intermediate A42) instead of 2-(trimethylsilyl)ethyl 5,8-diazaspiro[3.5]nonane-8-carboxylate (Intermediate A30). The isomers were separated by chiral SFC (C-SFC-5; mobile phase: CO2/MeOH: 85/15) to give the first eluting isomer of the title compound: Isomer 1: C-SFC-6 (mobile phase: CO2/MeOH: 85/15): Rt=1.20 min, UPLC-MS-2a: Rt=1.31 min; MS m/z [M+H]+ 548.9 and the second eluting isomer of the title compound: Isomer 2: C-SFC-6 (mobile phase: CO2/MeOH: 85/15): Rt=1.69 min, UPLC-MS-2a: Rt=1.31 min; MS m/z [M+H]+ 548.4.
The title compound was prepared by a method similar to Method-C28-A using 6-chloro-5-methoxy-1-(tetrahydro-2H-pyran-2-yl)-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-indazole (Intermediate D8) instead of 5-chloro-6-methyl-1-(tetrahydro-2H-pyran-2-yl)-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-indazole (Intermediate D1) in Step 3. UPLC-MS-2a: Rt=1.07/1.08 min; MS m/z [M+H]+ 666.4/668.4.
To a solution of tert-butyl 4-(4-bromo-5-methyl-1H-pyrazol-3-yl)-3,3-dimethylpiperazine-1-carboxylate (Intermediate C11, 324 g, 832 mmol) in CH2Cl2 (7.77 L) was added TFA (950 g, 8.30 mol) at 0° C. After completion of the reaction, the reaction mixture was concentrated under vacuum to give the title compound as a trifluoroacetate salt which was used without purification in the next step. UPLC-MS-1a: Rt=0.50 min; MS m/z [M+H]+ 273.0/275.0.
To a solution of 1-(4-bromo-5-methyl-1H-pyrazol-3-yl)-2,2-dimethylpiperazine trifluoroacetate salt (Step 1, 9.02 mmol) in CH2Cl2 (20.0 mL) were added DIPEA (9.46 mL, 54.1 mmol) and 2,5-dioxopyrrolidin-1-yl (2-(trimethylsilyl)ethyl) carbonate (2.81 g, 10.8 mmol) and the reaction mixture was stirred at RT overnight. The RM was partitioned between brine and EtOAc and the aqueous layer was extracted with EtOAc (×2). The combined organic layers were dried (phase separator) and the filtrate was concentrated under vacuum. The residue was purified by normal phase chromatography (eluent: MeOH in CH2Cl2 0 to 20%) to give the title compound as a white foam. UPLC-MS-2a: Rt=1.32 min; MS m/z [M+H]+ 417.1/419.1.
To a solution of 2-(trimethylsilyl)ethyl 4-(4-bromo-5-methyl-1H-pyrazol-3-yl)-3,3-dimethylpiperazine-1-carboxylate (Step 2, 6.50 g, 14.0 mmol) in dry DMF (70.0 mL) were added tert-butyl 6-(tosyloxy)-2-azaspiro[3.3]heptane-2-carboxylate (Intermediate C2, 5.15 g, 14.0 mmol) and Cs2CO3 (11.4 g, 35 mmol) at RT. The reaction mixture was stirred at 80° C. overnight. The RM was diluted with water and extracted twice with EtOAc. The combined organic layers were washed with brine, dried (Na2SO4), and the filtrate was concentrated under vacuum. The crude residue was purified by normal phase chromatography (eluent: EtOAc in c-hexane 0 to 100%) to give the title compound as a white foam. UPLC-MS-2a: Rt=1.47 min; MS m/z [M+H]+ 612.2/614.2.
The title compound was prepared by a method similar to Method-C28-A (Step 3) by replacing 2-(trimethylsilyl)ethyl 5-(1-(2-(tert-butoxycarbonyl)-2-azaspiro[3.3]heptan-6-yl)-4-iodo-5-methyl-1H-pyrazol-3-yl)-5,8-diazaspiro[3.5]nonane-8-carboxylate with tert-butyl 6-(4-bromo-3-(2,2-dimethyl-4-((2-(trimethylsilyl)ethoxy)carbonyl)piperazin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 3). The title compound was obtained as a yellow foam after normal phase chromatography (eluent: EtOAc in c-hexane 0 to 100%). UPLC-MS-2a: Rt=1.46 min; MS m/z [M+H]+ 782.5/784.5.
The title compound was prepared by a method similar to Method-C28-A (Step 4) by replacing 2-(trimethylsilyl)ethyl 5-(1-(2-(tert-butoxycarbonyl)-2-azaspiro[3.3]heptan-6-yl)-4-(5-chloro-6-methyl-1-(tetrahydro-2H-pyran-2-yl)-1H-indazol-4-yl)-5-methyl-1H-pyrazol-3-yl)-5,8-diazaspiro[3.5]nonane-8-carboxylate with tert-butyl 6-(4-(5-chloro-6-methyl-1-(tetrahydro-2H-pyran-2-yl)-1H-indazol-4-yl)-3-(2,2-dimethyl-4-((2-(trimethylsilyl)ethoxy)carbonyl)piperazin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 4). The title compound obtained as a yellow foam and was used without purification in the next step. 1H NMR (600 MHz, DMSO-d6) δ 7.68 (s, 1H), 7.62 (d, 1H), 5.85-5.75 (m, 1H), 4.78-4.67 (m, 1H), 4.01-3.85 (m, 5H), 3.80-3.70 (m, 1H), 3.63-3.58 (m, 2H), 2.93-2.86 (m, 2H), 2.73-2.61 (m, 4H), 2.51 (s, 3H), 2.45 (t, 2H), 2.40-2.37 (m, 1H), 2.07-1.91 (m, 5H), 1.77-1.72 (m, 2H), 1.62-1.55 (m, 2H), 1.38 (s, 9H), 1.07 (d, 3H), 0.99 (d, 3H). UPLC-MS-2a: Rt=1.06 min; MS m/z [M+H]+ 638.3.
Under inert atmosphere, to a stirred solution of tert-butyl 6-(3-bromo-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Intermediate C1, 20.0 g, 56.1 mmol), (S)-1-benzyl-3-ethyl-3-methylpiperazine (Intermediate A32, 15.3 g, 70.2 mmol), bis(3,5-bis(trifluoromethyl)phenyl)(2′,6′-bis(dimethylamino)-3,6-dimethoxybiphenyl-2-yl)phosphine (CAS: 1810068-30-4, 3.19 g, 4.21 mmol), and Pd(dba)2 (2.41 g, 4.21 mmol) in 1,4-dioxane (300 mL) was added NaOtBu (2M in THF, 42.1 mL, 84.0 mmol). The reaction mixture was placed in a preheated bath (85° C.) and stirred at 85° C. for 16 h. After cooling to RT, the reaction mixture was poured into saturated aqueous NaHCO3 solution and extracted with EtOAc. The combined organic layers were washed with brine, dried (Na2SO4), filtered and concentrated. The crude residue was purified by normal phase chromatography (eluent: [EtOAc/MeOH 20/1] in n-heptane 0 to 100%) to give the title compound as an orange oil. UPLC-MS-4: Rt=1.01 min; MS m/z [M+H]+ 494.4.
To an ice-cooled solution of tert-butyl (S)-6-(3-(4-benzyl-2-ethyl-2-methylpiperazin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 1, 19.2 g, 36.9 mmol) in THF (185 mL) was added NIS (9.14 mg, 40.6 mmol) at 0° C. and the reaction mixture was stirred at RT for 80 min. The RM was poured into EtOAc/water and extracted with EtOAc. The combined organic layers were washed with a sat. aq. Na2S2O3 solution then brine, dried (Na2SO4), filtered, and concentrated under vacuum. The crude residue was purified by normal phase chromatography (eluent: [EtOAc/MeOH 20/1] in n-heptane 0 to 50%) to give the title compound as a yellow foam. UPLC-MS-2a: Rt=1.11 min; MS m/z [M+H]+ 620.4.
Under inert atmosphere, to a stirred solution of tert-butyl (S)-6-(3-(4-benzyl-2-ethyl-2-methylpiperazin-1-yl)-4-iodo-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 2, 19.2 g, 30.0 mmol), 5-chloro-6-methyl-1-(tetrahydro-2H-pyran-2-yl)-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-indazole (Intermediate D1, 16.9 g, 45.0 mmol), and K3PO4 (2M aq. Solution, 45.0 mL, 90.0 mmol) in 1,4-dioxane (300 mL) was added RuPhos (1.47 g, 3.00 mmol) and RuPhos-Pd-G3 (2.56 g, 3.00 mmol) and the reaction mixture was stirred at 85° C. for 1 h. The RM was quenched with NaHCO3 (1M aq. Solution) and extracted with EtOAc (×2). The combined organic layers were washed with brine, dried (Na2SO4) and filtered. To the filtrate was added SiliaMetS®Thiol (4.8 mmol) and the mixture was swirled at 40° C. for 10 min. The mixture was filtered and concentrated under vacuum. The crude residue was purified by normal phase chromatography (eluent: [EtOAc/MeOH 20/1] in n-heptane 0 to 40%) to give the title compound as an orange foam. UPLC-MS-2a: Rt=1.15 min; MS m/z [M+H]+ 742.6.
Tert-butyl 6-(3-((S)-4-benzyl-2-ethyl-2-methylpiperazin-1-yl)-4-(5-chloro-6-methyl-1-(tetrahydro-2H-pyran-2-yl)-1H-indazol-4-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 3, 19.8 g, 25.3 mmol) was dissolved in a mixture of EtOAc (253 mL) and AcOH (14.5 mL) and 10% Pd/C (2.70 g) was added. The reaction mixture was placed under a pressure of hydrogen (3 bars) and stirred at RT for 20 h. The RM was filtered through a celite pad and the filtrate was poured into NaHCO3 (1M aq. Solution), then extracted with EtOAc (×2). The combined organic layers were washed with NaHCO3 (1M aq. Solution), dried (Na2SO4), filtered, and concentrated under vacuum. The crude residue was purified by normal phase chromatography (eluent: [CH2Cl2/MeOH/Et3N 200/20/2] in CH2Cl2 0 to 100%) to give the title compound as off-white foam. 1H NMR (400 MHz, DMSO-d6) δ 8.65 (br, 1H), 7.71 (s, 0.8H), 7.65 (s, 0.2H), 7.60-7.64 (m, 0.8H), 7.56-7.60 (m, 0.2H), 5.74-5.85 (m, 1H), 4.62-4.79 (m, 1H), 3.81-4.04 (m, 5H), 3.74 (m, 1H), 3.00-3.21 (m, 2H), 2.85 (m, 1H), 2.55-2.78 (m, 6H), 2.49 (s, 3H), 2.30-2.44 (m, 1H), 1.88-2.07 (m, 5H), 1.62-1.80 (m, 2H), 1.53-1.61 (m, 2H), 1.38 (s, 6.9H), 1.37 (m, 2.1H), 0.90 (m, 1.6H), 0.83 (m, 1.4H), 0.49 (m, 1.6H), 0.39 (m, 1.4H). UPLC-MS-2a: Rt=1.07 ml; MS m/z [M+H]+ 652.5/654.5.
Method-C39a: similar to Method-C39 except that Step 4 was performed with 2 equivalents of DIPEA in hexafluoroisopropanol as solvent instead of EtOAc/AcOH.
The following intermediates C40 to C48 were prepared using analogous methods to Method-C29 from intermediates described in the intermediates synthesis section or commercially available (in Step 1, 2 or 3).
The title compound was prepared by a method similar to Step 1 of Method-C39 using 9-benzyl-2-oxa-6,9-diazaspiro[4.5]decane (Intermediate A44) instead of (S)-1-benzyl-3-ethyl-3-methylpiperazine (Intermediate A32). The enantiomers were separated by chiral SFC (C-SFC-2: mobile phase: CO2/[IPA+0.025% NH3]: 82/18) to give the first eluting enantiomer of the title compound: Intermediate C49a; C-SFC-3 (mobile phase: CO2/[IPA+0.025% NH3]: 83/17): Rt=2.31 min, UPLC-MS-3: Rt=0.96 min; MS m/z [M+H]+ 508.4 and the second eluting enantiomer of the title compound: Intermediate C49b: C-SFC-3 (mobile phase: CO2/[IPA+0.025% NH3]: 83/17): Rt=2.84 min, UPLC-MS-3: Rt=0.96 min; MS m/z [M+H]+ 508.4.
The title compound was prepared by a method similar to Method-C39 (Step 1) using 1-benzyl-3-(methoxymethyl)-3-methylpiperazine (Intermediate A37-rac) instead of (S)-1-benzyl-3-ethyl-3-methylpiperazine (Intermediate A32). UPLC-MS-4: Rt=0.91 min; MS m/z [M+H]+ 510.4.
The title compound was prepared by a method similar to Method-C39 (Step 2) using tert-butyl 6-(3-(4-benzyl-2-(methoxymethyl)-2-methylpiperazin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 1) instead of tert-butyl (S)-6-(3-(4-benzyl-2-ethyl-2-methylpiperazin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate. The isomers were separated by chiral SFC (C-SFC-7; mobile phase: CO2/MeOH: 85/15) to give tert-butyl (S)-6-(3-(4-benzyl-2-(methoxymethyl)-2-methylpiperazin-1-yl)-4-iodo-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate Intermediate C50a as the first eluting enantiomer; C-SFC-8 (mobile phase: CO2/[MeOH+0.025% NH3]: 85/15): Rt=2.72 min, UPLC-MS-4: Rt=1.07 min; MS m/z [M+H]+ 636.5 and tert-butyl (R)-6-(3-(4-benzyl-2-(methoxymethyl)-2-methylpiperazin-1-yl)-4-iodo-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate Intermediate C50b as the second eluting enantiomer: C-SFC-8 (mobile phase: CO2/[MeOH+0.025% NH3]: 85/15): Rt=3.12 min, UPLC-MS-4: Rt=1.07 min; MS m/z [M+H]+ 636.4.
Under inert atmosphere, to a stirred solution of tert-butyl 6-(3-bromo-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Intermediate C1, 3.00 g, 8.42 mmol), (S)-1-benzyl-3-(2-methoxyethyl)-3-methylpiperazine (Intermediate A38, 2.20 g, 8.84 mmol), bis(3,5-bis(trifluoromethyl)phenyl)(2′,6′-bis(dimethylamino)-3,6-dimethoxybiphenyl-2-yl)phosphine (CAS [1810068-30-4], 0.33 g, 0.43 mmol) and Pd(dba)2 (0.24 g, 0.42 mmol) in 1,4-dioxane (40 mL) was added NaOtBu (2M in THF, 5.89 mL, 11.8 mmol). The reaction mixture was placed in a preheated bath (85° C.) and stirred at 85° C. for 6 h. After cooling to RT, the RM was poured into a sat. aq. NaHCO3 solution and extracted with EtOAc. The combined organic layers were washed with brine, dried (Na2SO4), filtered and concentrated. The crude residue was purified by normal phase chromatography (eluent: EtOAc in c-hexane 0 to 75%) to give the title compound as a brown oil. UPLC-MS-4: Rt=0.91 min; MS m/z [M+H]+ 524.5.
Tert-butyl (S)-6-(3-(4-benzyl-2-(2-methoxyethyl)-2-methylpiperazin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 1, 3.47 g, 6.63 mmol) was dissolved in a mixture of EtOAc (60 mL) and AcOH (3.79 mL) and 10% Pd/C (0.71 g, 0.66 mmol) was added. The reaction mixture was placed under hydrogen atmosphere and stirred at RT for 16 h. The RM was filtered through a celite pad and the filtrate was poured into a sat. aq. NaHCO3 solution, then extracted with EtOAc (2×). The combined organic layers were washed with a sat. aq. NaHCO3 solution, dried (Na2SO4), filtered and concentrated under vacuum. The crude residue was purified by normal phase chromatography (eluent: MeOH in CH2Cl2 0 to 10%) to give the title compound as white solid. UPLC-MS-4: Rt=0.69 min; MS m/z [M+H]+ 434.5.
The following intermediates C52 to C54 were prepared using analogous methods to Method-C51 from intermediates described in the intermediates synthesis section or commercially available (in Step 1, 2 or 3).
To a solution of tert-butyl (S)-6-(3-(4-benzyl-2-ethyl-2-methylpiperazin-1-yl)-4-iodo-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (prepared in Method-C39 (Step 2), 15.0 g, 22.0 mmol) in CH2Cl2 (150 mL) was added 1-chloroethyl chloroformate (4.75 mL, 44.1 mmol) and the reaction mixture was stirred for 1.5 h at 40° C. MeOH (50 mL) and a sat. aq. NaHCO3 solution were added (100 mL) and the mixture was vigorously stirred for 30 min until disappearance of the carbamate intermediate. CH2Cl2 was added and the layers were separated, the organic layer was washed with a sat. aq. NaHCO3, dried (phase separator) and concentrated. The crude residue was purified by normal phase chromatography (eluent: MeOH in CH2Cl2 0 to 10%) to give the title product. UPLC-MS-4: Rt=0.90 min; MS m/z [M+H]+ 530.3.
The title compound was prepared by a method similar to Intermediate C55 starting from tert-butyl (R)-6-(3-(4-benzyl-2-(methoxymethyl)-2-methylpiperazin-1-yl)-4-iodo-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Intermediate C50b) instead of Tert-butyl (S)-6-(3-(4-benzyl-2-ethyl-2-methylpiperazin-1-yl)-4-iodo-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate. UPLC-MS-4: Rt=0.80 min; MS m/z [M+H]+ 546.3.
To a stirred solution of tert-butyl (S)-6-(3-(2-(2-methoxyethyl)-2-methylpiperazin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (intermediate C51, 1.08 g, 2.49 mmol) in CH2Cl2 (20 mL) were added under argon atmosphere 2-oxetanone (0.27 g, 3.74 mmol) and NaBH(OAc)3 (1.58 g, 7.47 mmol). The reaction mixture was stirred for 1 h at RT. The RM was quenched by addition of a sat. aq. NaHCO3 solution and extracted CH2Cl2 (2×). The combined organic layers were washed with a sat. aq. NaHCO3 solution, dried (Na2SO4), filtered and evaporated. The crude residue was purified by normal phase chromatography (eluent: EtOAc in c-hexane from 0 to 100%). UPLC-MS-4: Rt=0.87 min; MS m/z [M+H]+ 490.5.
The title compound was prepared by a method similar to Method-C57 using tetrahydro-4H-pyran-4-one instead of 2-oxetanone. UPLC-MS-4: Rt=0.73 min; MS m/z [M+H]+ 518.5.
The title compound was prepared by a method similar to Method-C57 starting from tert-butyl (R)-6-(4-iodo-3-(2-(methoxymethyl)-2-methylpiperazin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Intermediate C56) and using tetrahydro-4H-pyran-4-one instead of 2-oxetanone. UPLC-MS-4: Rt=0.81 min; MS m/z [M+H]+ 630.5.
The title compound was prepared by a method similar to Method-C57 starting from tert-butyl (S)-6-(3-(2-(difluoromethyl)-2-methylpiperazin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Intermediate C52) and using tetrahydro-4H-pyran-4-one instead of 2-oxetanone. UPLC-MS-4: Rt=0.87 min; MS m/z [M+H]+ 510.4.
The title compound was prepared by a method similar to Method-C57 starting from tert-butyl (S)-6-(5-methyl-3-(2,2,5-trimethylpiperazin-1-yl)-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate instead of intermediate C51. UPLC-MS-4: Rt=0.89 min; MS m/z [M+H]+ 460.4.
The title compound was prepared by a method similar to Method-C51 starting from (S)-1-benzyl-2,5,5-trimethylpiperazine (Intermediate A39) instead Intermediate A38. UPLC-MS-4: Rt=0.73 min; MS m/z [M+H]+ 405.4.
To a stirred solution of tert-butyl (S)-6-(3-(2-(2-methoxyethyl)-2-methylpiperazin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (intermediate C51, 1.18 g, 2.64 mmol) and (S)-(1,4-dioxan-2-yl)methyl 4-methylbenzenesulfonate (Intermediate B1, 1.09 g, 3.96 mmol) in CH3CN (20 mL) were added under nitrogen atmosphere triethylamine (1.10 mL, 7.92 mmol) and sodium iodide (396 mg, 2.64 mmol) and the reaction mixture was stirred for 48 h at 80° C. The RM was poured into a sat. aq. NaHCO3 solution, extracted with EtOAc (×3), the combined organic extracts were washed with brine, dried (Na2SO4), filtered and concentrated. The crude residue was purified by normal phase chromatography (eluent: EtOAc in n-heptane 0 to 100%) to give the title product. UPLC-MS-4: Rt=0.75 min; MS m/z [M+H]+ 534.5.
The title compound was prepared by a method similar to Intermediate C62 starting from tert-butyl (S)-6-(3-(2-(difluoromethyl)-2-methylpiperazin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Intermediate C52) instead of Intermediate C51. UPLC-MS-4: Rt=1.00 min; MS m/z [M+H]+ 526.5.
The title compound was prepared by a method similar to Intermediate C62 starting from tert-butyl (S)-6-(3-(2-(difluoromethyl)-2-ethylpiperazin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (intermediate C54) instead of Intermediate C51. UPLC-MS-4: Rt=1.09 min; MS m/z [M+H]+ 540.4.
To a solution of tert-butyl (S)-6-(3-(2-ethyl-2-methylpiperazin-1-yl)-4-iodo-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Intermediate C55, 10.6 g, 17.2 mmol) and triethylamine (12.0 mL, 86 mmol) in CH3CN (120 mL) was added 8 (S)-(1,4-dioxan-2-yl)methyl 4-methylbenzenesulfonate (Intermediate B1, 5.63 g, 20.7 mmol) and the reaction mixture was stirred for 7 d at 80° C. in an Ace-tube under nitrogen atmosphere. The reaction mixture was poured into a sat. aq. NaHCO3 solution, extracted with EtOAc (×3), the combined organic extracts were washed with brine, dried (phase peparator) and concentrated. The crude residue was purified by normal phase chromatography (eluent: EtOAc in c-hexane 0 to 40%) to give the title product. UPLC-MS-4: Rt=0.96 min; MS m/z [M+H]+ 630.3.
The title compound was prepared by a method similar to Intermediate C65 starting from tert-butyl (R)-6-(4-iodo-3-(2-(methoxymethyl)-2-methylpiperazin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Intermediate C56). UPLC-MS-4: Rt=0.90 min; MS m/z [M+H]+ 646.4.
To an ice-cooled solution of tert-butyl (S)-6-(3-(2-ethyl-2-methylpiperazin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Intermediate C53, 7.51 g, 18.6 mmol) in CH2Cl2 (93 mL) under inert atmosphere were added DIPEA (9.75 mL, 55.8 mmol) and 2,5-dioxopyrrolidin-1-yl (2-(trimethylsilyl)ethyl) carbonate (4.83 g, 18.6 mmol). The reaction mixture was stirred at RT for 1 h. The RM was quenched with a sat. aq. NaHCO3 solution and extracted with CH2Cl2. The combined organic layer was washed with brine, then dried (MgSO4), filtered and evaporated. The crude residue was purified by normal phase chromatography (eluent: TBME in n-heptane 0 to 100%) to give the title compound as a white solid. UPLC-MS-4: Rt=1.62 min; MS m/z [M+H]+ 548.5.
To a solution of tert-butyl (R)-6-(3-(4-benzyl-2-(methoxymethyl)-2-methylpiperazin-1-yl)-4-iodo-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Intermediate C50b, 1.78 g, 2.80 mmol), 5,6-dichloro-1-(tetrahydro-2H-pyran-2-yl)-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-indazole (Intermediate D6, 1.33 g, 3.36 mmol) and [P(tBu)3] Pd(crotyl)Cl (0.11 g, 0.28 mmol) in dioxane (25 mL) was added under Argon atmosphere K3PO4 (1M in water, 3.64 mL, 3.64 mmol) and the reaction mixture was stirred at 80° C. for 18 h. The RM was poured into a sat. aq. NaHCO3 solution and extracted with EtOAc (×2). The combined organic extracts were washed with a sat. aq. NaHCO3, dried (Na2SO4), filtered and concentrated. The residue was swirled in CH2Cl2 with Si-TMT (Cas [1226494-16-1], 0.50 g, loading 0.5 mmol/g) for 1 h at 40° C., concentrated and purified by normal phase chromatography (eluent: EtOAc in c-hexane 0 to 48%) to give the title compound as a white solid. UPLC-MS-4: Rt=1.30 min; MS m/z [M+H]+ 778.4/780.4/782.4.
To a solution of tert-butyl 6-(3-((R)-4-benzyl-2-(methoxymethyl)-2-methylpiperazin-1-yl)-4-(5,6-dichloro-1-(tetrahydro-2H-pyran-2-yl)-1H-indazol-4-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 1, 1.59 g, 2.04 mmol) in CH2Cl2 (20 mL) was added 1-chloroethyl chloroformate (0.45 mL, 4.08 mmol) and the reaction mixture was stirred for 1 h at RT. The RM was poured into a sat. aq. NaHCO3 solution and extracted with CH2Cl2. The combined organic extracts were washed with a sat. aq. NaHCO3, dried (Na2SO4), filtered and concentrated. The crude residue was purified by normal phase chromatography (eluent: AcOEt in c-hexane 0 to 60%) to give the title product. UPLC-MS-4: Rt=1.13 min; MS m/z [M−COCH(CH3)Cl]+ 688.5/690.5/692.5 .
A solution of tert-butyl 6-(3-((2R)-4-(2-chloropropanoyl)-2-(methoxymethyl)-2-methylpiperazin-1-yl)-4-(5,6-dichloro-1-(tetrahydro-2H-pyran-2-yl)-1H-indazol-4-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 2, 1.11 g, 1.42 mmol) in MeOH (20 mL) was stirred for 16 h at RT. Then the RM was evaporated and the crude residue was purified by normal phase chromatography (eluent: MeOH in CH2Cl2 0 to 10%) to give the title product to give the title compound. Rt=1.13 min; MS m/z [M+H]+ 688.6/690.6/692.6.
To a stirred solution of tert-butyl 6-(3-bromo-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Intermediate C4, 10.0 g, 29.2 mmol), (S)-1-benzyl-3-ethyl-3-methylpiperazine (Intermediate A32, 7.66 g, 35.1 mmol), bis(3,5-bis(trifluoromethyl)phenyl)(2′,6′-bis(dimethylamino)-3,6-dimethoxybiphenyl-2-yl)phosphine (CAS [1810068-30-4], 1.66 g, 2.19 mmol) and Pd(dba)2 (1.26 g, 2.19 mmol) in toluene (250 mL) was added under Argon NaOtBu (2 M in THF, 21.9 mL, 43.8 mmol) and the reaction mixture was stirred for 16 h at 85° C. The RM was quenched with a sat. aq. NaHCO3 solution and extracted with EtOAc (×2). The combined organic layer was washed with a sat. aq. NaHCO3 solution, dried (Na2SO4), filtered and evaporated. The crude residue was purified by normal phase chromatography (eluent: EtOAc in c-hexane from 0% to 45%) to give the title compound as a brown oil. UPLC-MS-4: Rt=0.99 min; MS m/z [M+H]+ 480.4.
To a stirred solution of tert-butyl (S)-6-(3-(4-benzyl-2-ethyl-2-methylpiperazin-1-yl)-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 1, 4.79 g, 9.99 mmol) in THF (100 mL) under Ar was added NBS (1.95 g, 11.0 mmol) at RT and the reaction mixture was stirred for 30 min. The RM was quenched by addition of a sat. aq. NaHCO3 solution and extracted with EtOAc (×2). The combined organic layer was washed with a sat. aq. NaHCO3 solution, dried (Na2SO4), filtered and evaporated. The crude residue was purified by normal phase chromatography (eluent: EtOAc in c-hexane from 0 to 34%) to afford the title compound as a white solid. UPLC-MS-4: Rt=1.11 min; MS m/z [M+H]+ 558.4/560.4.
To a stirred solution of tert-butyl (S)-6-(3-(4-benzyl-2-ethyl-2-methylpiperazin-1-yl)-4-bromo-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 2, 1.66 g, 2.97 mmol) in THF (25 mL) under Ar was added LDA (1M in THF, 3.86 mL, 3.86 mmol) at −78° C. The mixture was stirred for 60 min at −78° C. and p-toluenesulfonyl cyanide (0.70 g, 3.86 mmol) was added. The reaction mixture was stirred for 30 min at −78° C. and was quenched with a sat. aq. NaHCO3 solution. EtOAc was added, the layers were separated, and the aqueous layer was extracted with EtOAc (×2). The combined organic extracts were washed with a sat. aq. NaHCO3 solution, dried (Na2SO4), filtered and evaporated. The crude residue was purified by normal phase chromatography (eluent: EtOAc in c-hexane from 0 to 35%) to afford the title compound as a white solid. UPLC-MS-4: Rt=1.36 min; MS m/z [M+H]+ 583.3/585.3.
To a stirred solution of tert-butyl (S)-6-(3-(4-benzyl-2-ethyl-2-methylpiperazin-1-yl)-4-bromo-5-cyano-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 3, 1.46 g, 2.50 mmol), 5-chloro-6-methyl-1-(tetrahydro-2H-pyran-2-yl)-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-indazole (Intermediate D1, 1.13 g, 3.00 mmol) and K3PO4 (1.59 g, 7.51 mmol) in dioxane (20 mL) and H2O (4 mL) was added under Ar RuPhos (0.12 g, 0.25 mmol) and RuPhos-Pd-G3 (0.21 g, 0.25 mmol) and the reaction mixture was stirred for 1 h at 100° C. The RM was quenched with a sat. aq. NaHCO3 solution and extracted with EtOAc (×2). The combined organic extracts were washed a sat. aq. NaHCO3 solution, dried (Na2SO4), filtered and evaporated. The crude residue was purified by normal phase chromatography (eluent: EtOAc in c-hexane from 0 to 50%) to afford the title product as a white solid. UPLC-MS-4: Rt=1.45, 1.48 min; MS m/z [M+H]+ 753.8/755.8.
To a stirred solution of tert-butyl 6-(3-((S)-4-benzyl-2-ethyl-2-methylpiperazin-1-yl)-4-(5-chloro-6-methyl-1-(tetrahydro-2H-pyran-2-yl)-1H-indazol-4-yl)-5-cyano-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 4, 1.96 g, 2.60 mmol) in CH2Cl2 (40 mL) was added under Argon 1-chloroethyl chloroformate (0.57 mL, 5.20 mmol) and the reaction mixture was stirred for 16 h at RT. The RM was quenched with a sat. aq. NaHCO3 solution, extracted with CH2Cl2 (×2) and the combined organic layers were washed with a sat. aq. NaHCO3 solution, dried (Na2SO4), filtered and evaporated. The crude residue was purified by normal phase chromatography (eluent: EtOAc in c-hexane from 0 to 50%) to afford the title compound as a white solid. UPLC-MS-4: Rt=1.03 min; MS m/z [M−COCH(Cl)CH3+H]+663.6/665.6.
Tert-butyl 6-(4-(5-chloro-6-methyl-1-(tetrahydro-2H-pyran-2-yl)-1H-indazol-4-yl)-3-((2S)-4-(2-chloropropanoyl)-2-ethyl-2-methylpiperazin-1-yl)-5-cyano-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 5, 1.11 g, 1.47 mmol) was stirred in MeOH (10 mL) for 16 h at RT. After completion of the reaction, the RM was concentrated and the crude residue was purified by normal phase chromatography (eluent: (MeOH/NH4OH:80/20) in CH2Cl2 from 0 to 10%) to give the title product as a white solid. UPLC-MS-4: Rt=1.02 min; MS m/z [M−COCH(Cl)CH3+H]+663.6/665.6.
The title compound was prepared by a method similar to Intermediate C69 (Step 1 and 2) starting from (R)-4-((2,2-dimethylpiperidin-4-yl)methyl)morpholine tert-butyl (Intermediate A70) intead of (S)-1-benzyl-3-ethyl-3-methylpiperazine (Intermediate A32) in Step 1. UPLC-MS-4: Rt=0.84 min; MS m/z [M+H]+ 552.4/554.4.
To a stirred solution of tert-butyl (R)-6-(4-bromo-3-(2,2-dimethyl-4-(morpholinomethyl)piperidin-1-yl)-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Intermediate C70, 1.40 g, 2.53 mmol) in THF (25 mL) under Ar was added LDA (1M in THF, 3.80 mL, 3.80 mmol) at −78° C. The reaction mixture was stirred for 60 min at −78° C. and iodomethane-d3 (0.24 mL, 3.80 mmol) was added. The RM was stirred for 30 min at −78° C., then allowed to reach RT and further stirred for 2 h. The RM was quenched with a sat. aq. NaHCO3 solution. EtOAc was added, the layers were separated, and the aqueous layer was extracted with EtOAc (×2). The combined organic extracts were washed with a sat. aq. NaHCO3 solution, dried (Na2SO4), filtered and evaporated. The crude residue was purified by normal phase chromatography (eluent: EtOAc in c-hexane from 0 to 50%) to afford the title compound as a white solid. UPLC-MS-4: Rt=0.96 min; MS m/z [M+H]+ 569.8/571.8.
The title compound was prepared by a method similar to Intermediate C69 (Step 1, 2 and 3) starting from (R)-4-((2,2-dimethylpiperidin-4-yl)methyl)morpholine tert-butyl (Intermediate A70) instead of (S)-1-benzyl-3-ethyl-3-methylpiperazine (Intermediate A32) in Step 1. UPLC-MS-4: Rt=0.89 min; MS m/z [M+H]+ 577.2/579.2.
Tert-butyl 6-(3-(8-benzyl-5,8-diazaspiro[3.5]nonan-5-yl)-4-iodo-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Prepared in Method-C28-B (Step 2), 0.50 g, 0.81 mmol), 2-(2-chloro-5-(methoxymethoxy)-3,6-dimethylphenyl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane (Intermediate D15, 0.53 g, 1.62 mmol) and K3PO4 (2M in water, 1.21 mL, 2.43 mmol) were added in EtOH (15 mL). The reaction mixture was degassed with nitrogen for 5 min. RuPhos (0.075 g, 0.16 mmol) and RuPhos-Pd-G3 (0.135 g, 0.16 mmol) were added and the RM was stirred at 90° C. for 30 min. After completion of the reaction, the RM was quenched with water and extracted with EtOAc (×2). The combined organic layer was washed with brine, dried (Na2SO4), filtered and concentrated under vacuum. The crude residue was purified by reverse phase chromatography (eluent: 0 to 48% CH3CN in water containing 0.1% HCOOH) to obtain the title product. UPLC-MS-5: Rt=2.26 min, MS m/z [M+H]+ 690.4/692.3.
Tert-butyl 6-(3-(8-benzyl-5,8-diazaspiro[3.5]nonan-5-yl)-4-(2-chloro-5-(methoxymethoxy)-3,6-dimethylphenyl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 1, 0.36 g, 0.52 mmol) was dissolved in isopropanol (10 mL). Pd(OH)2 (20%) (0.36 g, 0.31 mmol) was added and the reaction mixture was stirred at RT under hydrogen pressure (1 atmosphere) for 6 h. The RM was filtered through a pad of celite. The filtrate was concentrated under vacuum and the residue was purified by reverse phase combiflash (eluent: 0 to 60% CH3CN in water containing in 0.025% NH3) to give the title product. UPLC-MS-9: Rt=1.39 min, MS m/z [M+H]+ 600.6/602.5.
Tert-butyl 6-(4-(2-chloro-5-(methoxymethoxy)-3,6-dimethylphenyl)-5-methyl-3-(5,8-diazaspiro[3.5]nonan-5-yl)-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 2, 0.29 g, 0.48 mmol) and 3-oxetanone (0.07 g, 0.97 mmol) were dissolved in methanol (4 mL). The mixture was cooled to 0° C. under a nitrogen atmosphere and ZnCl2 (0.19 g, 1.45 mmol) and TFA (0.11 g, 2.90 mmol) were added. The mixture was stirred for 10 min at 0° C. before the addition of NaBH3CN (0.10 g, 1.50 mmol). The reaction mixture was allowed to reach RT and stirred at RT for 16 h. After completion of the reaction, the RM was diluted with water and extracted with EtOAc (×2). The combined organic layer was washed with brine, dried (Na2SO4), filtered and concentrated under vacuum to give the title compound which was used in the next step without further purification. UPLC-MS-9: Rt=1.42 min, MS m/z [M+H]+ 656.4/658.4.
A stirred solution of tert-butyl 6-(3-bromo-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Intermediate C1, 15.8 g, 44.3 mmol) and 4,4-diethoxy-2,2-dimethylpiperidine (Intermediate A47, 11.6 g, 57.7 mmol) in toluene (320 mL) was degassed with argon and Pd(dba)2 (2.04 g, 3.55 mmol), bis(3,5-bis(trifluoromethyl)phenyl)(2′,6′-bis(dimethylamino)-3,6-dimethoxybiphenyl-2-yl)phosphine (CAS: 1810068-30-4, 2.68 g, 3.55 mmol) were added followed by the addition of NaOtBu (2M in THF, 66.5 mL, 133 mmol). The reaction mixture was placed in a preheated bath (90° C.) and stirred at 90° C. for 5 h. After cooling to RT, the RM was poured into a mixture of ice and water and extracted with EtOAc (×2). The combined organic layers were washed with brine, dried (Na2SO4), filtered and concentrated. The crude residue was purified by normal phase chromatography (eluent: [EtOAc+1% Et3N] in n-heptane 0 to 40%) to give the title compound as brown oil. 1H NMR (400 MHz, DMSO-d6) δ 5.56 (s, 1H), 4.53 (m, 1H), 3.91 (m, 2H), 3.83 (m, 2H), 3.43-3.36 (m, 4H), 3.01 (m, 2H), 2.54 (m, 4H), 2.11 (s, 3H), 1.72 (m, 2H), 1.37 (s, 9H), 1.13 (s, 6H), 1.10 (t, 6H).
A solution of tert-butyl 6-(3-(4,4-diethoxy-2,2-dimethylpiperidin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (9.54 g, 20.0 mmol) and PTSA (1.52 g, 8.01 mmol) in acetone (160 mL) was stirred overnight at 50° C. The reaction mixture was evaporated to ¼ of its volume and the residue was diluted with AcOEt. The organic layer was washed with a sat. aq. Na2CO3 solution and with brine. The organic layer was dried (Na2SO4), filtered and concentrated. The crude residue was purified by normal phase chromatography (eluent: EtOAc+1% Et3N in heptane 0 to 100%) to give the title compound as a yellow oil. UPLC-MS-4: Rt=1.11 min; MS m/z [M+H]+ 403.4.
The title compound was prepared by a method similar to that of Intermediate C74 using 8,8-diethoxy-5-azaspiro[3.5]nonane (intermediate A48) instead of 4,4-diethoxy-2,2-dimethylpiperidine (intermediate A47) and 0.1 equivalent of PTSA instead of 0.4. UPLC-MS-4: Rt=1.24 min; MS m/z [M+H]+ 415.3.
A solution of tert-butyl 6-(3-bromo-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Intermediate C1, 1.62 g, 4.56 mmol) and 4-((tert-butyldiphenylsilyl)oxy)-2,2-dimethylpiperidine (Intermediate A56, 1.40 g, 3.81 mmol) in toluene (20 mL) was purged with nitrogen gas for about 10 min. NaOtBu (2M in THF, 5.70 mL, 13.7 mmol) and bis(tri-tert-butylphosphine)palladium (CAS [53199-31-8], 0.19 g, 0.38 mmol) were added and the reaction mixture was stirred at 95° C. for 6 h in a sealed tube. After completion of the reaction, the RM was filtered through a pad of celite and the filtrate was concentrated under vacuum. The crude residue was purified by reverse phase chromatography (eluent: 0 to 60% CH3CN in H2O containing 0.1% NH3) to give the title compound. LCMS-2: Rt=2.94 min; MS m/z [M+H]+ 643.7.
To a solution of tert-butyl 6-(3-(4-((tert-butyldiphenylsilyl)oxy)-2,2-dimethylpiperidin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 1, 1.10 g, 1.71 mmol) in dry THF (20 mL) under nitrogen atmosphere was added at 0° C. TBAF (1.0 M in THF, 5.13 mL, 5.13 mmol). The RM was slowly allowed to reach RT and stirred at RT for 14 h. The reaction mixture was diluted with water and extracted with EtOAc (×2). The combined organic extracts were dried (Na2SO4), filtered and concentrated under vacuum. The crude residue was purified by reverse phase chromatography (eluent: 0 to 100% CH3CN in H2O containing 0.1% NH3) to give the title compound. The enantiomers were separated by chiral preparative SFC (C-SFC-47; mobile phase: CO2/[CH3CN/IPA 50/50+0.1% DEA]: 85/15) to give the first eluting enantiomer of the title compound: Intermediate C76a 1; C-SFC-48 (mobile phase: CO2/[IPA/CH3CN 50/50+0.1% DEA]: 95/5 to 50/50): Rt=4.67 min, UPLC-MS-5: Rt=1.45 min; MS m/z [M+H]+ 405.7 and the second eluting enantiomer of the title compound: Intermediate C76b: C-SFC-48 (mobile phase: CO2/[IPA/CH3CN 50/50+0.1% DEA]: 95/5 to 50/50): Rt=5.12 min, UPLC-MS-5: Rt=1.45 min; MS m/z [M+H]+ 405.7.
To a solution of tert-butyl 6-(3-(2,2-dimethyl-4-oxopiperidin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Intermediate C74, 4.00 g, 9.95 mmol) in EtOH (40 mL) at 0° C. was added portion-wise added NaBH4 (1.51 g, 39.8 mmol) and the reaction mixture was allowed to reach RT and was stirred at RT for 2 h. After completion of reaction, the RM was quenched by addition of a sat. aq. NaHCO3 solution and extracted with EtOAc. The combined organic extracts were washed with brine, dried (Na2SO4), filtered and concentrated under vacuum. The crude residue was purified by reverse phase chormatography (eluent: 0 to 35% CH3CN in H2O (containg 0.1% HCO2H)), to give the title compound as oil after basic work-up. The enantiomers were separated by chiral SFC C-SFC-47 (mobile phase: CO2/[CH3CN/IPA+0.1% Et2NH (70/30)]: 85/15) to give the first eluting enantiomer of the title compound: Tert-butyl (R)-6-(3-(2,2-dimethyl-4-(2-morpholinoethoxy)piperidin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate: C-SFC-31 (mobile phase: CO2/[CH3CN/IPA+0.1% Et2NH (70/30)]: 85/15): Rt=3.95 min, UPLC-MS-4: Rt=0.73 min; MS m/z [M+H]+ 405.4 and the second eluting enantiomer of the title compound: Tert-butyl (S)-6-(3-(2,2-dimethyl-4-(2-morpholinoethoxy)piperidin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate: C-SFC-31 (mobile phase: CO2/[CH3CN/IPA+0.1% Et2NH (70/30)]: 85/15): Rt=6.40 min, UPLC-MS-4: Rt=0.73 min; MS m/z [M+H]+ 405.4.
To a solution of tert-butyl (R)-6-(3-(4-hydroxy-2,2-dimethylpiperidin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 1 first eluting enantiomer, 1.95 g, 4.82 mmol) in CH2Cl2 (25 mL) was added TFA (11.1 mL, 145 mmol) and the reaction mixture was stirred at RT for 16 h. Volatiles were removed in vacuo, and the residue was co-evaporated with CH2Cl2 (×2) to give the title compound as a trifluoroacetate salt (brown oil). UPLC-MS-4: Rt=0.79 min; MS m/z [M+H]+ 401.3.
To a solution of (R)-2,2-dimethyl-1-(5-methyl-1-(2-azaspiro[3.3]heptan-6-yl)-1H-pyrazol-3-yl)piperidin-4-yl 2,2,2-trifluoroacetate (Step 2, 4.78 g, 4.93 mmol) in CH2Cl2 (50 mL) was added at 0° C. triethylamine (7.55 mL, 54.2 mmol) followed by benzyl chloroformate (0.77 mL, 5.42 mmol). The reaction mixture was allowed to slowly reach RT and was stirred for 16 h at RT. The RM was poured into water and extracted CH2Cl2 (×2). The combined organic extracts were dried (phase separator) and evaporated. The crude residue was dissolved in THF (25 mL) and water (25 mL), NaOH (0.98 g, 24.6 mmol) was added and the RM was stirred at RT for 16 h. The reaction mixture was poured into water and extracted CH2Cl2 (×2). The combined organic extracts were dried (phase separator) and evaporated. The crude residue was purified by normal phase chromatography (eluent: MeOH in CH2Cl2 from 0 to 20%) to give the title compound as a white foam. UPLC-MS-4: Rt=0.76 min; MS m/z [M+H]+ 439.4.
To a solution of benzyl (R)-6-(3-(4-hydroxy-2,2-dimethylpiperidin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 3, 1.10 g, 2.51 mmol) in THF (25 mL) was added at 0° C. NaH (0.30 g, 7.52 mmol) under a nitrogen atmsophere. The reaction mixture was stirred 1 h at 0° C. before addition of allyl bromide (0.32 mL, 3.76 mmol). The RM was slowly allowed to reach RT and was stirred for 16 h. Allyl bromide (0.32 mL, 3.76 mmol) was added again and the RM was further stirred at RT for 16 h. The RM was quenched by addition of ice and extracted with EtOAc (×2). The combined organic extracts were washed with brine, dried (Na2SO4), filtered and concentrated. The crude residue was purified by normal phase chromatography (eluent: EtOAc in n-heptane from 0 to 100%, then 20% MeOH in CH2Cl2) to give the title compound as a yellow oil. UPLC-MS-4: Rt=1.15 min; MS m/z [M+H]+ 479.6.
A solution of benzyl (R)-6-(3-(4-(allyloxy)-2,2-dimethylpiperidin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 4, 1.15 g, 2.40 mmol), osmium tetroxide (2.5% in water, 6.03 mL, 0.48 mmol) and N-methylmorpholine oxide hydrate (0.36 g, 2.64 mmol) in dioxane (18.0 mL) and water (6.00 mL) was stirred 2 h at RT. After completion of the reaction, NaIO4 (5.14 g, 24.0 mmol) was added and the RM was stirred at RT for 1 h. The reaction mixture was quenched by addition of a sat. aq. NaHCO3 solution and extracted with EtOAc (×2). The combined organic extracts were washed with a sat. aq. NaHCO3 solution, dried (Na2SO4) and evaporated. The crude residue was purified by normal phase chromatography (eluent: (CH2Cl2/MeOH 8/2) in CH2Cl2 from 0 to 50%) to give the title compound as a grey foam. UPLC-MS-4: Rt=0.76 min; MS m/z [M+H]+ 481.4.
A solution of benzyl (R)-6-(3-(2,2-dimethyl-4-(2-oxoethoxy)piperidin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 5, 1.00 g, 2.08 mmol) and morpholine (0.22 mL, 2.50 mmol) in dichloroethane (11 mL) was stirred at 0-5° C. for 10 min, then sodium triacetoxyborohydride (0.66 g, 3.12 mmol) was added and the reaction mixture was stirred at 0-5° C. for 30 min. The reaction mixture was poured into an aq. sat. NaHCO3 solution and extracted with CH2Cl2 (×2). The combined organic extracts were dried (phase separator) and concentrated. The crude residue was purified by normal phase chromatography (eluent: MeOH in CH2Cl2 from 0 to 8%) to give the title compound as a brownish oil. UPLC-MS-4: Rt=0.66 min; MS m/z [M+H]+ 552.6.
To a solution of benzyl (R)-6-(3-(2,2-dimethyl-4-(2-morpholinoethoxy)piperidin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 6, 1.00 g, 1.81 mmol) in THF (20 mL) was added (Boc)2O (0.82 g, 3.80 mmol) and the mixture was evacuated and back-filled with nitrogen (×3). Pd-C 10% (0.20 g, 0.20 mmol) was added and the mixture was evacuated and back-filled with nitrogen (×2) then was evacuated and back-filled with hydrogen (×3). The reaction mixture was stirred at RT under hydrogen atmosphere (balloon) for 16 h. The RM was filtered over a pad of celite and washed with MeOH. The filtrate was concentrated and the crude residue was purified normal phase chromatography (eluent: (MeOH/CH2Cl2 8/2) in CH2Cl2 from 0 to 100%) to give the title compound as a white foam. UPLC-MS-4: Rt=0.65 min; MS m/z [M+H]+ 518.5.
Tert-butyl 6-(3-bromo-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Intermediate C1, 680 mg, 1.91 mmol), 4-(3-methoxyazetidin-1-yl)-2,2-dimethylpiperidine (Intermediate A49, 672 mg, 2.86 mmol), Pd(dba)2 (110 mg, 0.19 mmol) and bis(3,5-bis(trifluoromethyl)phenyl)(2′,6′-bis(dimethylamino)-3,6-dimethoxybiphenyl-2-yl)phosphine (CAS [1810068-30-4], 0.16 g, 0.21 mmol) were suspended in 1,4-dioxane (10 mL). NaOtBu (2M in THF, 3.82 mL, 7.63 mmol) was added, the vial was flushed with N2 and the reaction mixture placed in a pre-heated oil bath at 80° C. for 1 h. Water was added and the mixture was extracted with EtOAc (×2). The combined organic extracts were washed with brine, dried (Na2SO4), filtered and concentrated. The crude residue was purified by normal phase chromatography (eluent: (CH2Cl2/10% MeOH) in CH2Cl2, 0 to 30%) and the purified fractions were neutralized by addition of a sat. aq. NaHCO3 solution and extracted with EtOAc (×2) to give after evaporation under reduced pressure the title compound. The isomers were separated by chiral SFC (C-SFC-15; mobile phase: CO2/[IPA+0.025% NH3]: 60/40) to give the first eluting enantiomer of the title compound: Intermediate C78a; C-SFC-10 (mobile phase: CO2/[IPA+0.1% NH3]: 60/40): Rt=2.05 min, UPLC-MS-2a: Rt=0.84 min; MS m/z [M+H]+; 474.5 and the second eluting enantiomer of the title compound: Intermediate C78b: C-SFC-10 (mobile phase: CO2/[IPA+0.1% NH3]: 60/40): Rt=3.12 min, UPLC-MS-2a: Rt=0.84 min; MS m/z [M+H]+ 474.5.
Method-C78a: similar to Method-C78 except that Step 1 was performed in toluene instead of dioxane.
The following examples C79 to C83 were prepared using analogous methods to method-C78 from intermediates (in Step 1) described in the intermediates synthesis section A or commercially available.
Tert-butyl 6-(3-bromo-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Intermediate C1, 1.50 g, 4.20 mmol), 4-(2,2-dimethylpiperidin-4-yl)morpholine (Intermediate A53, 1.20 g, 5.46 mmol), 18-crown-6 (1.10 g, 4.20 mmol), NaOtBu (2M in THF, 2.40 g, 5.89 mmol) were suspended in 1,4-dioxane (40 mL) and degassed with nitrogen for 5 min. Pd(tBu3P)2 (0.21 g, 0.42 mmol) was added and the reaction mixture was heated to 95° C. in a screw capped vial for 2 h. After completion of the reaction, the reaction mixture was filtered through a pad of celite and the filtrate was concentrated under vacuum. The crude residue was purified by reverse phase chromatography (eluent: 0 to 100% CH3CN in water containing 0.1% formic acid) to give the title product. The two enantiomers were separated by chiral HPLC (C-HPLC-25: mobile phase ([hexane+0.1% DEA]/[IPA:MeOH (50:50)]80:20); flow rate: 18 mL/min) to afford the first eluting isomer of the title compound: Intermediate C94a: UPLC-MS-5: Rt=1.50 min, MS m/z [M+H]+ 474.5, C-SFC-48 (mobile phase: CO2/[MeOH+0.1% DEA], gradient 5 to 50%), Rt=5.79 min, and the second eluting isomer of the title compound: Intermediate C94b: C-SFC-48: (mobile phase: (CO2/[MeOH+0.1% DEA], gradient 5 to 50%), Rt=6.10 min.
Tert-butyl 6-(3-bromo-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Intermediate C1, 1.25 g, 3.53 mmol) and 2,7,7-trimethyl-2,8-diazaspiro[4.5]decan-3-one (Intermediate A60, 0.90 g, 4.59 mmol) were dissolved in toluene (25 mL) and purged with nitrogen. NaOtBu (2.0M in THF, 8.80 mL, 17.7 mmol), bis(3,5-bis(trifluoromethyl)phenyl)(2′,6′-bis(dimethylamino)-3,6-dimethoxybiphenyl-2-yl)phosphine (CAS [1810068-30-4], 0.16 g, 0.21 mmol) and Pd(dba)2 (0.12 g, 0.21 mmol) were added and the reaction mixture was heated to 90° C. for 24 h. After completion of the reaction, the RM was diluted with EtOAc and filtered through a pad of celite. The filtrate was concentrated under reduced pressure and the crude residue was purified by normal phase chromatography on neutral alumina (eluent: 0 to 2% MeOH in CH2Cl2) to give the title product. UPLC-MS-5: Rt=1.48 min, MS m/z [M+H]+ 472.6.
To a solution of tert-butyl 6-(5-methyl-3-(2,7,7-trimethyl-3-oxo-2,8-diazaspiro[4.5]decan-8-yl)-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 1, 0.78 g, 1.66 mmol) in CH3CN (5 mL) cooled at 0° C. was added NIS (0.39 g, 1.73 mmol) and the reaction mixture was stirred for 20 min. The RM was diluted with water and extracted with CH2Cl2. The combined organic layers were washed with water, brine, dried (Na2SO4), filtered and concentrated. The crude residue was purified reverse phase chromatography (eluent: 0 to 60% CH3CN in water) to give the desired product. The enantiomers were separated by reverse phase chiral HPLC (C-HPLC-28 (mobile phase: MeOH+0.1% DEA isocratic 100%)) to give the first eluting isomer of the title compound: Intermediate C95a: UPLC-MS-5: Rt=2.11 min, MS m/z [M+H]+ 598.6; C-HPLC-29 (mobile phase: 0.1% DEA in MeOH, Isocratic 100%), Rt=7.86 min and the second eluting isomer of the title compound: Intermediate C95b: UPLC-MS-5: Rt=2.11 min, MS m/z [M+H]+ 598.6; C-HPLC-29 (mobile phase: 0.1% DEA in MeOH, Isocratic 100%), Rt=10.7 min.
A solution of tert-butyl 6-(3-bromo-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Intermediate C1, 1.20 g, 3.37) and 3,7,7-trimethyl-1-oxa-3,8-diazaspiro[4.5]decan-2-one (Intermediate A66, 0.86 g, 3.36 mmol) in toluene (48 mL) was degassed with argon for 10 min and NaOtBu (2M in THF, 0.97 g, 10.1 mmol), 18-crown 6 ether (0.89 g, 3.36 mmol), t-BuPhCPhos (0.20 g, 0.51 mmol) and Pd(dba)2 (0.19 g, 0.34 mmol) were added. The reaction mixture was stirred at 110° C. for 4 h. Then the RM was quenched with water and extracted with EtOAc. The combined organic extracts were washed with a sat. aq. NaHCO3 solution, brine, dried (Na2SO4), filtered and concentrated under vacuum. The crude residue was purified reverse phase chromatography (eluent: 70 to 80% CH3CN in H2O containing 0.025% NH3) to give the title compound. UPLC-MS-5: Rt=1.56 min; MS m/z [M+H]+ 474.8.
To a solution of tert-butyl 6-(5-methyl-3-(3,7,7-trimethyl-2-oxo-1-oxa-3,8-diazaspiro[4.5]decan-8-yl)-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 1, 1.10 g, 2.33 mmol) in CH3CN (20 mL) at 0° C. under nitrogen atmosphere was added NIS (0.52 g, 2.33 mmol) and the reaction mixture was stirred at 0° C. for 30 min. The RM was quenched with water and extracted with CH2Cl2. The combined organic extracts were washed with a sat. aq. NaHCO3 solution, brine, dried (Na2SO4), filtered and concentrated under vacuum. The crude residue was purified reverse phase chromatography (eluent: 90 to 100% CH3CN in H2O containing 0.1% NH3) to give the title compound as pale yellow solid. The enantiomers were separated by chiral preparative HPLC (C-HPLC-27; mobile phase: [n-Hexane+0.1% DEA]/[MeOH/IPA+0.1% DEA 50/50]: 83/17) to give the first eluting isomer of the title compound: Intermediate C96a; C-HPLC-29 (mobile phase: [n-Hexane+0.1% DEA][MeOH/IPA 50/50]: 70/30): Rt=9.33 min, UPLC-MS-5: Rt=2.11 min; MS m/z [M+H]+ 600.8 and the second eluting isomer of the title compound: Intermediate C96b: C-HPLC-29 (mobile phase: [n-Hexane+0.1% DEA][MeOH/IPA 50/50]: 70/30): Rt=11.4 min, UPLC-MS-5: Rt=2.11 min; MS m/z [M+H]+ 600.8.
To a solution of (1R,5S)-3-oxa-8-azabicyclo[3.2.1]octane (1.01 g, 8.50 mmol) in DCE (60 mL) under argon atmosphere was added tert-butyl 6-(3-(2,2-dimethyl-4-oxopiperidin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Intermediate C74, 2.40 g, 5.66 mmol) and the mixture was stirred at RT for 15 min. Then, sodium triacetoxyborohydride (3.60 g, 17.0 mmol) was added and the reaction mixture was stirred at RT for 20 h. The RM was then heated at 70° C. until completion. The RM was quenched by addition of a sat. aq. NaHCO3 solution and extracted with EtOAc (×2). The combined organic extracts were washed with brine, dried (Na2SO4), filtered and evaporated. The crude residue was purified by normal phase chromatography (eluent: 0-10% MeOH in CH2Cl2) to give the title compound. The enantiomers were separated by chiral HPLC (C-HPLC-7; mobile phase: n-heptane/IPA 55/45+0.05% DEA) to give the first eluting isomer of the title compound: Intermediate C97a; C-HPLC-5 (mobile phase: n-heptane/IPA 55/45+0.05% DEA): Rt=5.85 min, UPLC-MS-4: Rt=0.75 min; MS m/z [M+H]+; 500.4 and the second eluting isomer of the title compound: Intermediate C97b: C-HPLC-5 (mobile phase: n-heptane/IPA 55/45+0.05% DEA): Rt=7.70 min, UPLC-MS-4: Rt=0.77 min; MS m/z [M+H]+ 500.4.
The title compound was prepared by a method similar to Method-C97 but using 3,9-dioxa-7-azabicyclo[3.3.1]nonane and CH2Cl2 instead of (1R,5S)-3-oxa-8-azabicyclo[3.2.1]octane and DCE respectively. UPLC-MS-4: Rt=0.73 min; MS m/z [M+H]+ 516.4.
The title compound was prepared by a method similar to Intermediates C101a and C101b Step 2 but using tert-butyl 6-(3-(4-(3,9-dioxa-7-azabicyclo[3.3.1]nonan-7-yl)-2,2-dimethylpiperidin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate and THF instead of CH3CN. The enantiomers were separated by chiral SFC (C-SFC-4 (mobile phase: CO2/[IPA+0.025% NH3] 85/15) to give the first eluting enantiomer of the title compound: Intermediate C98a: C-SFC-3 (mobile phase: CO2/[MeOH+0.025% NH3] 85/15), Rt=2.97 min; UPLC-MS-4: Rt=0.93 min, MS m/z [M+H]+ 642.5 and the second eluting enantiomer of the title compound: Intermediate C98b: C-SFC-3 (mobile phase: CO2/[MeOH+0.025% NH3] 85/15), Rt=4.10 min, UPLC-MS-4: Rt=0.93 min, MS m/z [M+H]+ 642.5.
The title compound was prepared by a method similar to that of Intermediate Method-C97 using and (1R,4R)-2-(methylsulfonyl)-2,5-diazabicyclo[2.2.1]heptane (Intermediate A46) instead of (1R,5S)-3-oxa-8-azabicyclo[3.2.1]octane. The enantiomers were separated by chiral SFC (C-SFC-4 (mobile phase: CO2/[IPA+0.1% Et3N] 82/18) to give the first eluting isomer of the title compound: Intermediate C99a: C-SFC-3 (mobile phase: CO2/[MeOH+0.025% NH3] 85/15), Rt=1.66 min; UPLC-MS-4: Rt=0.68 min, MS m/z [M+H]+ 563.8 and the second eluting isomer of the title compound: Intermediate C99b: C-SFC-3 (mobile phase: CO2/[MeOH+0.025% NH3] 85/15), Rt=2.98 min, UPLC-MS-4: Rt=0.70 min, MS m/z [M+H]+ 563.6.
In a Ace tube, to a solution of tert-butyl 6-(5-methyl-3-(8-oxo-5-azaspiro[3.5]nonan-5-yl)-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Intermediate C75, 1.00 g, 2.17 mmol) in MeOH (20 mL) was added under nitrogen atmosphere bis(2-methoxyethyl)amine (0.58 g, 4.34 mmol). The solution was cooled to 0° C., ZnCl2 (0.03 g, 0.22 mmol) was added and the mixture was stirred for 10 min before addition of NaBH3CN (0.55 g, 8.68 mmol). The reaction mixture was stirred at 50° C. for 16 h. Then was cooled to RT, poured into a sat. aq. NaHCO3 solution and extracted with EtOAc (×2). The combined organic extracts were dried (phase separator) and concentrated. The crude residue was purified by normal phase chromatography (eluent: MeOH in CH2Cl2 from 0 to 5%) to give the title compound as a white foam. UPLC-MS-4: Rt=0.86 min; MS m/z [M+H]+ 532.4
To an ice-cooled solution of tert-butyl 6-(3-(8-(bis(2-methoxyethyl)amino)-5-azaspiro[3.5]nonan-5-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 1, 920 mg, 1.73 mmol) in CH3CN (12 mL) was added NBS (616 mg, 3.46 mmol) and the reaction mixture slowly allowed to react RT and stirred at RT for 16 h. The mixture reaction mixture was poured into a 10% Na2S2O3 solution and extracted with EtOAc (2×). The combined organic extracts were washed with a sat. aq. NaHCO3 solution, dried (phase separator) and concentrated. The crude residue was purified by normal phase chromatography (eluent: EtOAc in c-hexane 0 to 100%) to give the title compound. The enantiomers were separated by chiral HPLC (C-HPLC-7: mobile phase: n-heptane/EtOH 95/55+0.05% DEA) to give the first eluting isomer of the title compound: Intermediate C100a; C-HPLC-11 (mobile phase: n-heptane/EtOH 95/55+0.05% DEA): Rt=4.57 min, UPLC-MS-4: Rt=0.99 min; MS m/z [M+H]+; 610.4/612.4 and the second eluting isomer of the title compound: Intermediate C100b: C-HPLC-11 (mobile phase: n-heptane/EtOH 95/55+0.05% DEA): Rt=6.40 min, UPLC-MS-4: Rt=1.00 min; MS m/z [M+H]+ 610.3/612.3.
The title compound was prepared by a method similar to Method-C100 using N-methyloxetan-3-amine instead of bis(2-methoxyethyl)amine. UPLC-MS-5: Rt=1.50 min, MS m/z [M+H]+=486.3.
To a solution of tert-butyl 6-(5-methyl-3-(8-(methyl(oxetan-3-yl)amino)-5-azaspiro[3.5]nonan-5-yl)-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 1, 5.60 g, 12.0 mmol) in CH3CN (280 mL) under nitrogen atmosphere was added NIS (2.59 g, 11.5 mmol) and the reaction mixture was stirred at 0° C. for 10 min. After completion of the reaction, the RM was diluted with water and extracted with EtOAc. The combined organic layer was washed with brine, dried (Na2SO4), filtered and concentrated under vacuum. The crude residue was purified by reverse phase chromatography (eluent: 40 to 50% CH3CN in water containing 0.025% NH3) to give the title product. The enantiomers were separated by chiral HPLC (C-HPLC-32: mobile phase: [hexane+0.1% DEA]/[IPA/MeOH 50/50]85/15) to give the first eluting isomer of the title compound: Intermediate C101a: C-SFC-53 (mobile phase: CO2/[MeOH+0.1% DEA] 75:25), Rt=6.64 min; UPLC-MS-8: Rt=0.96 min, MS m/z [M+H]+ 612.4 and the second eluting isomer of the title compound: Intermediate C101b: C-SFC-53 (mobile phase: CO2/[MeOH+0.1% DEA] 75:25), Rt=10.7 min, UPLC-MS-8: Rt=0.96 min, MS m/z [M+H]+ 612.4.
The title compound was prepared by a method similar to Method-C100 Step 1 starting from tert-butyl 6-(3-(2,2-dimethyl-4-oxopiperidin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Intermediate C74) and N-methyloxetan-3-amine. The enantiomers were separated by chiral SFC (C-SFC-47 (mobile phase: CO2/[MeOH:CH3CN (50:50)+0.1% DEA] 85/15) to give the first eluting isomer of the title compound: Intermediate C102a: C-SFC-48 (mobile phase: CO2/[MeOH:CH3CN (50:50)+0.1% DEA] 80/20), Rt=4.92 min; UPLC-MS-5: Rt=1.47 min, MS m/z [M+H]+ 474.5 and the second eluting isomer of the title compound: Intermediate C102b: C-SFC-48 (mobile phase: CO2/[MeOH:CH3CN (50:50)+0.1% DEA] 80/20), Rt=6.70 min, UPLC-MS-5: Rt=1.51 min, MS m/z [M+H]+ 474.9.
To a solution of tert-butyl 6-(5-methyl-3-(8-oxo-5-azaspiro[3.5]nonan-5-yl)-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Intermediate C75, 0.75 g, 1.80 mmol) in MeOH (5 mL) at 0° C. under nitrogen atmosphere, were added morpholine (0.31 g, 3.62 mmol) and ZnCl2 (0.49 g, 3.62 mmol). The mixture was stirred for 5 min before the addition of NaBH3CN (0.34 g, 5.41 mmol) and the reaction mixture was stirred at 50° C. for 1 h. After completion of the reaction, the RM was diluted with water and extracted with EtOAc (×2). The combined organic layer was washed with brine, dried (Na2SO4), filtered and concentrated under vacuum. The crude residue was purified by chromatography on neutral alumina (eluent: 0 to 5% MeOH in CH2Cl2) to afford the desired product. The enantiomers were separated by chiral SFC (C-SFC-54: mobile phase: CO2/[MeOH+0.1% DEA]92:8) to give the first eluting isomer of the title compound: Intermediate C103a: C-SFC-55 (mobile phase: CO2/[MeOH+0.1% DEA] gradient: 5 to 50%), Rt=3.83 min; UPLC-MS-5: Rt=1.57 min, MS m/z [M+H]+ 487.0 and the second eluting isomer of the title compound: Intermediate C103b: C-SFC-55 (mobile phase: CO2/[MeOH+0.1% DEA] gradient: 5 to 50%), Rt=4.10 min; UPLC-MS-5: Rt=1.56 min, MS m/z [M+H]+ 487.0.
To a solution of tert-butyl 6-(3-(2,2-dimethyl-4-oxopiperidin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Intermediate C74, 1.50 g, 3.72 mmol) and 3-methylazetidin-3-ol (0.92 g, 7.4 mmol) in methanol (30 mL) at 0° C. under nitrogen atmosphere was added acetic acid (0.022 g, 0.37 mmol). The mixture was stirred for 10 min before NaBH3CN (2.30 g, 37.0 mmol) was added portionwise. The reaction mixture was stirred at RT for 16 h. After completion of the reaction, the RM was distilled and then was diluted with EtOAc, washed with a sat. solution of NaHCO3, brine, dried (Na2SO4), filtered and concentrated under vacuum. The crude residue was purified chromatography on neutral alumina (eluent: 0 to 1% MeOH in CH2Cl2) to afford the title product. The enantiomers were separated by chiral SFC (C-SFC-47: mobile phase: CO2/[CH3CN/MeOH+0.1% DEA (50/50)] 85/15) to give the first eluting isomer of the title compound: Intermediate C104a: C-SFC-48 (mobile phase: CO2/[CH3CN/MeOH+0.1% DEA (50/50)] 70/30), Rt=6.63 min; UPLC-MS-5: Rt=1.52 min, MS m/z [M+H]+ 474.9 and the second eluting isomer of the title compound: Intermediate C104b: C-SFC-48 (mobile phase: CO2/[CH3CN/MeOH+0.1% DEA (50/50)] 70/30), Rt=9.01 min; UPLC-MS-5: Rt=1.45 min, MS m/z [M+H]+ 474.9.
To a solution of tert-butyl 6-(3-(2,2-dimethyl-4-oxopiperidin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Intermediate C74, 1.70 g, 4.01 mmol) in MeOH (30 mL) was added under nitrogen atmosphere (1S,4S)-2-oxa-5-azabicyclo[2.2.1]heptane (746 mg, 6.02 mmol). The solution was stirred 15 min at RT and NaBH3CN (756 mg, 12.0 mmol) was added. The RM was futher stirred at RT until completion of the reaction. The RM was poured into a sat. aq. NaHCO3 solution and extracted with EtOAc (×2). The combined organic extracts were dried (Na2SO4), filtered and concentrated. The crude residue was purified by normal phase chromatography (eluent: MeOH in CH2Cl2 from 0 to 10%) to give the title compound as a white foam. The enantiomers were separated by chiral SFC (C-SFC-2: mobile phase: CO2/[MeOH+0.025% NH3] 85/15) to give the first eluting isomer of the title compound: Intermediate C105a; C-SFC-3 (mobile phase: CO2/[MeOH+0.025% NH3] 85/15): Rt=1.00 min, UPLC-MS-4: Rt=0.71 min; MS m/z [M+H]+ 486.4 and the second eluting isomer of the title compound: Intermediate C105b: C-SFC-3 (mobile phase: CO2/[MeOH+0.025% NH3] 85/15): Rt=1.56 min, UPLC-MS-4: Rt=0.71 min; MS m/z [M+H]+ 486.4.
To a solution of tert-butyl 6-(3-(2,2-dimethyl-4-oxopiperidin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Intermediate C74, 1.50 g, 3.65 mmol) in MeOH (25 mL) was added under nitrogen atmosphere (R)-3-aminotetrahydrofuran (0.48 g, 5.48 mmol). The solution was stirred 30 min at RT and NaBH3CN (0.46 g, 7.30 mmol) was added. The RM was futher stirred at RT overnight and formaldehyde (25% in water, 1.50 mL, 20.2 mmol) was added. The RM was further stirred at RT for 64 h. Then was poured into a sat. aq. NaHCO3 solution and extracted with EtOAc (×2). The combined organic extracts were dried (Na2SO4), filtered and concentrated. The crude residue was purified by normal phase chromatography (eluent: MeOH in CH2Cl2 from 0 to 10%) to give the title compound. The enantiomers were separated by chiral SFC (C-SFC-7: mobile phase: CO2/[MeOH+0.025% NH3] 70/30) to give the first eluting isomer of the title compound: Intermediate C106a; C-SFC-8 (mobile phase: CO2/[MeOH+0.025% NH3] 85/15): Rt=1.59 min, UPLC-MS-4: Rt=0.78 min; MS m/z [M+H]+ 488.4 and the second eluting isomer of the title compound: Intermediate C106b: C-SFC-8 (mobile phase: CO2/[MeOH+0.025% NH3] 85/15): Rt=1.97 min, UPLC-MS-4: Rt=0.78 min; MS m/z [M+H]+ 488.4.
N-Oxetan-3-amine hydrochloride (1.39 g, 12.7 mmol) was added at 0° C. under nitrogen atmosphere to a solution of tert-butyl 6-(3-(2,2-dimethyl-4-oxopiperidin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Intermediate C74, 2.56 g, 6.36 mmol) in MeOH (50 mL). ZnCl2 (2.59 g, 19.1 mmol) was added and reaction mixture was stirred for 5 min prior to the addition of NaBH3CN (1.2 g, 19.1 mmol). The reaction mixture was stirred at 50° C. for 16 h. Acetaldehyde (0.56 g, 12.7 mmol) was then added and the reaction mixture was further stirred at 50° C. for 1 h. After completion of the reaction, the RM was diluted with water and passed through celite bed. The filtrate was extracted with EtOAc (×3) and the combined organic extracts were washed with brine, dried (Na2SO4), filtered and concentrated under vacuum. The crude residue was purified by normal phase chromatography on neutral alumina (eluent: 0 to 5% MeOH in CH2Cl2) to give the title product. The enantiomers were separated by chiral SFC (C-SFC-47 (mobile phase: CO2/[IPA:CH3CN+0.1% DEA (50:50)] 85/15) to give the first eluting isomer of the title compound: Intermediate C107a; C-SFC-48 (mobile phase: CO2/[IPA:CH3CN+0.1% DEA (50:50)] 75/25), Rt=4.33 min, UPLC-MS-8: Rt=0.87 min, MS m/z [M+H]+ 488.6 and the second eluting isomer of the title compound: Intermediate C107b: C-SFC-48 (mobile phase: CO2/[IPA:CH3CN+0.1% DEA (50:50)] 75/25), Rt=5.35 min, UPLC-MS-8: Rt=0.88 min, MS m/z [M+H]+ 488.6.
To a solution of tert-butyl 6-(3-(2,2-dimethyl-4-oxopiperidin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Intermediate C74, 0.65 g, 1.61 mmol) in THF (8.10 mL) at 0° C. was added under nitrogen atmosphere methyl magnesium bromide (3M in Et2O, 1.07 mL, 3.22 mmol). The reaction mixture was stirred at 0° C. for 1 h. The RM was quenched with cold water and extracted with CH2Cl2. The combined organic extracts were washed with brine, dried (Na2SO4), filtered and concentrated under vacuum. The crude residue was purified by reverse phase chromatography (eluent: from 45 to 50% CH3CN in H2O containing 0.1% Formic acid) to give the title compound. The enantiomers were separated by chiral preparative HPLC (C-HPLC-25; mobile phase: [n-Hexane+0.1% DEA]/IPA/MeOH 78/11/11); flow rate: 18 mL/min) to give the first eluting isomer of the title compound: Intermediate C108a; C-HPLC-26 (mobile phase: [n-Hexane+0.1% DEA]/[IPA:MeOH 50/50] 90/10): Rt=9.45 min, UPLC-MS-5: Rt=1.46 min; MS m/z [M+H]+ 419.5 and the second eluting isomer of the title compound: Intermediate C108b: C-HPLC-26 (mobile phase: [n-Hexane+0.1% DEA]/[IPA:MeOH 50/50] 90/10): Rt=11.4 min, UPLC-MS-5: Rt=1.46 min; MS m/z [M+H]+ 419.5.
Tert-butyl 6-(3-(2,2-dimethyl-4-oxopiperidin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Intermediate C74, 1.50 g, 3.70 mmol) was dissolved in a solution of NH3 (4M in MeOH, 15 mL, 60 mmol). Pd/C 10% (0.80 g, 0.80 mmol) was added and the reaction mixture was stirred at RT under hydrogen (1 atmosphere) for 16 h. After completion of the reaction, the RM was filtered through a pad of celite and washed with MeOH. The filtrate was concentrated under vacuum to give the title product which was used in the next step without further purification. UPLC-MS-9: Rt=1.09 min, MS m/z [M+H]+ 404.3.
Tert-butyl 6-(3-(4-amino-2,2-dimethylpiperidin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 1, 1.40 g, 3.50 mmol) was dissolved in CH3CN (20 mL) and cooled to 0° C. under nitrogen atmosphere. NIS (0.78 g, 3.46 mmol) was added portionwise and the reaction mixture was stirred at RT for 1 h. After completion of the reaction, the RM was quenched with water and extracted with EtOAc. The combined organic layer was dried (Na2SO4), filtered and concentrated under vacuum. The crude residue was purified by reverse phase chromatography (eluent: 0 to 70% CH3CN in water containing NH3) to give the title product. UPLC-MS-9: Rt=1.26 min, MS m/z [M+H]+ 530.5.
Tert-butyl 6-(3-(4-amino-2,2-dimethylpiperidin-1-yl)-4-iodo-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 2, 0.20 g, 0.40 mmol) and NH3 (25% in water, 0.03 mL, 0.40 mmol) were added in MeOH (2 mL) and the mixture was cooled to 0° C. Glyoxal (40% in water, 0.054 mL, 0.38 mmol) and formaldehyde (38% in water, 0.03 mL, 0.38 mmol) were added and the reaction mixture was stirred at 60° C. for 5 h. After completion of the reaction, water was added and the mixture was extracted with EtOAc. The combined organic layer was dried (Na2SO4), filtered and concentrated under vacuum. The crude residue was purified by reverse phase chromatography (eluent: 0 to 70% CH3CN in water containing 0.1% NH3) to give the title product. The enantiomers were separated by chiral preparative HPLC (C-HPLC-32 (mobile phase: [n-Hexane+0.1% DEA]/[IPA:MeOH (50:50)] 85/15) to give the first eluting isomer of the title compound: Intermediate C109a:
C-HPLC-33 (mobile phase: [n-Hexane+0.1% DEA]/[IPA:MeOH 50/50] gradient 20 to 70%): Rt=7.72 min, UPLC-MS-9: Rt=1.31 min, MS m/z [M+H]+ 581.6 and the second eluting isomer of the title compound: Intermediate C109b: C-HPLC-33 (mobile phase: [n-Hexane+0.1% DEA]/[IPA:MeOH 50/50] gradient 20 to 70%): Rt=9.85 min, UPLC-MS-9: Rt=1.31 min, MS m/z [M+H]+ 581.6.
A solution of tert-butyl 6-(3-bromo-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Intermediate C1, 5.00 g, 14.1 mmol) and 8,8-diethoxy-5-azaspiro[3.5]nonane (A48, 2.99 g, 14.1 mmol) in dry toluene (120 mL) was degassed for 5 min. Pd(dba)2 (0.81 g, 1.40 mmol), bis(3,5-bis(trifluoromethyl)phenyl)(2′,6′-bis(dimethylamino)-3,6-dimethoxybiphenyl-2-yl)phosphine (CAS [1810068-30-4], 1.17 g, 1.55 mmol) and NaOtBu (2.0 M in THF, 56 mL, 112.4 mmol) was added and the reaction mixture and was heated to 90° C. for 2 h in a screw capped vessel. After completion of the reaction, the RM was diluted with water and extracted by EtOAc (×2). The combined organic layer was washed with brine, dried (Na2SO4), filtered and concentrated. The crude residue was purified by chromatography on neutral alumina (eluent: 0.5 to 1% MeOH in CH2Cl2) to give the title compound as a pale yellow oil. UPLC-MS-5: Rt=2.40 min, MS m/z [M+H]+ 489.5.
To a solution of tert-butyl 6-(3-(8,8-diethoxy-5-azaspiro[3.5]nonan-5-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 1, 1.10 g, 2.30 mmol) in CH3CN (15 mL) at 0° C. under nitrogen atmosphere was added portionwise NIS (0.51 g, 2.25 mmol) and the reaction mixture was stirred at 0° C. for 15 min. After completion of the reaction, the RM was diluted water and extracted with EtOAc. The combined organic layer was washed with water, sodium thiosulphate 10% solution, dried (Na2SO4), filtered and concentrated under vacuum to give the title compound which was used in the next step without further purification. UPLC-MS-6: Rt=3.06 min, MS m/z [M−OEt+H]+569.5.
Tert-butyl 6-(3-(8,8-diethoxy-5-azaspiro[3.5]nonan-5-yl)-4-iodo-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 2, 8.62 g, 14.0 mmol), 5-chloro-6-methyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1-tosyl-1H-indazole (Intermediate D4, 8.14 g, 18.2 mmol) and K3PO4 (2.0 M in water, 21 mL, 42 mmol) were added in toluene (43 mL). The reaction mixture was degassed with nitrogen for 5 min. Ruphos (1.00 g, 2.10 mmol) and RuPhos-Pd-G3 (1.20 g, 1.4 mmol) were added and the reaction mixture was stirred at 90° C. for 16 h. After completion of the reaction, the RM was diluted with water and extracted with EtOAc. The combined organic layer was washed with brine, dried (Na2SO4), filtered and concentrated to afford the desired product which was used in the next step without further purification. UPLC-MS-13: Rt=5.91 min, MS m/z [M-OEt]+761/763, [M+H]+ 807/809.
Tert-butyl 6-(4-(5-chloro-6-methyl-1-tosyl-1H-indazol-4-yl)-3-(8,8-diethoxy-5-azaspiro[3.5]nonan-5-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 3, 16.0 g, 20 mmol) was dissolved in acetone (100 mL) and cooled to 0° C. p-Toluene sulfonic acid (0.94 g, 1.98 mmol) was added and the reaction mixture was allowed to stir at RT for 16 h. After completion of the reaction, the RM was quenched with ice cold water and extracted with EtOAc. The combined organic layer was washed with brine, dried (Na2SO4), filtered and concentrated. The crude residue was further purified by chromatography on neutral alumina (eluent: 45 to 55% EtOAc in hexane) to obtain the desired product. UPLC-MS-5: Rt=2.47 min, MS m/z [M+H]+ 734.6.
Tert-butyl 6-(4-(5-chloro-6-methyl-1-tosyl-1H-indazol-4-yl)-5-methyl-3-(8-oxo-5-azaspiro[3.5]nonan-5-yl)-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 4, 5.80 g, 7.90 mmol) was dissolved in THF (200 mL). Tetrabutyl ammonium fluoride (1M in THF, 16.0 mL, 16.0 mmol) was added and the reaction mixture was heated at 55° C. for 16 h. After completion of the reaction, the RM was quenched with ice cold water and extracted with EtOAc. The combined organic layer was washed with brine, dried (Na2SO4), filtered and concentrated. The crude residue was purified by chromatography on neutral alumina (eluent: 0 to 4% MeOH in CH2Cl2) to give the title product. The two enantiomers were separated by chiral SFC C-SFC-50 (mobile phase: CO2/MeOH 87/13) to give the first eluting isomer of the title compound: Intermediate C110a; C-SFC-51 (mobile phase: CO2/MeOH, gradient 5 to 50%), Rt=5.0 min, UPLC-MS-5: Rt=2.21 min, MS m/z [M+H]+ 579.6/581.6 and the second eluting isomer of the title compound: Intermediate C110b: C-SFC-51: Mobile Phase: (CO2/MeOH, gradient 5 to 50%), Rt=5.4 min, UPLC-MS-6: Rt=2.20 min, MS m/z [M+H]+ 579.6/581.6.
The title compounds were prepared by a method similar to Method-C110 using 4,4-diethoxy-2,2-dimethylpiperidine (intermediate A47) instead of 8,8-diethoxy-5-azaspiro[3.5]nonane (intermediate A48) in Step 1 and THF instead of CH3CN in step 2. The two enantiomers were separated by chiral SFC C-SFC-4 (mobile phase: CO2/[IPA+0.1% Et3N] 75/25) to give the first eluting isomer of the title compound: Intermediate C111a; C-SFC-3 (mobile phase: CO2/[IPA+0.1% Et3N] 75/25): Rt=1.39 min; UPLC-MS-4: Rt=1.31 min; MS m/z [M+H]+ 567.3/569.3 and the second eluting isomer of the title compound: Intermediate C111b: C-SFC-3 (mobile phase: CO2/[IPA+0.1% Et3N] 75/25): Rt=2.24 min; UPLC-MS-4: Rt=1.31 min; MS m/z [M+H]+ 567.3/569.3.
Tert-butyl 6-(4-(5-chloro-6-methyl-1H-indazol-4-yl)-3-(2,2-dimethyl-4-oxopiperidin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Intermediate C111b, 1.50 g, 2.70 mmol) and oxetane-3-amine·HCl (0.58 g, 5.29 mmol) were dissolved in methanol (25 mL) and cooled to 0° C. under nitrogen atmosphere. Zinc chloride (1.08 g, 7.93 mmol) was added and the mixture stirred for 10 min. NaBH3CN (0.50 g, 8.00 mmol) was then added portionwise and the RM was stirred at RT for 16 h. The RM was then cooled to 0° C., acetaldehyde (0.20 g, 5.30 mmol) was added and the reaction mixture was stirred at 50° C. for 1.5 h. After completion of the reaction, the RM was diluted with EtOAc, washed with water, brine, dried (Na2SO4), filtered and concentrated under vacuum. The crude residue was purified by chromatography on neutral alumina (eluent: 0 to 5.5% MeOH in CH2Cl2) to obtain the title product. UPLC-MS-7: Rt=4.55 min, 4.65 min, MS m/z [M+H]+ 652.4/653.4.
Tert-butyl 6-(4-(5-chloro-6-methyl-1H-indazol-4-yl)-3-(2,2-dimethyl-4-oxopiperidin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Intermediate C111b, 384 mg, 0.68 mmol) and N-methyloxetan-3-amine (88.0 mg, 1.02 mmol) were dissolved in dichloroethane (5 mL) and cooled to 0° C. under nitrogen atmosphere. Then Sodium triacetoxyborohydride (421 mg, 2.03 mmol) was added and the reaction mixture was stirred at RT for 24 h. After completion of the reaction, the RM was poured into a sat. aq. NaHCO3 solution and extracted with EtOAc (×2). The combined organic extracts were washed, dried (Na2SO4), filtered and concentrated under vacuum. The crude residue was purified by normal phase chromatography (eluent: 0 to 10% MeOH in CH2Cl2) to obtain the title product. UPLC-MS-7: Rt=1.01 min, 1.04 min, MS m/z [M+H]+ 638.4.
A solution of tert-butyl 6-(3-bromo-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Intermediate C1, 2.00 g, 5.62 mmol) and 4-(((tert-butyldiphenylsilyl)oxy)methyl)-2,2-dimethylpiperidine (Intermediate A69, 2.78 g, 7.29 mmol) in 1,4-dioxane (30 mL) was degassed with nitrogen for 5 min and Pd(dba)2 (0.32 g, 0.56 mmol) and 2-[bis(3,5-trifluoromethylphenylphosphino)-3,6-dimethoxy]-2′,6′-di-i-propoxy-1,1′-biphenyl (CAS [1810068-31-5], 0.47 g, 0.62 mmol) were added followed by NaOtBu (2.0 M in THF, 3.93 mL, 7.85 mmol). The reaction mixture was heated to 90° C. and stirred for 3 h in a sealed tube. The RM was filtered through a pad of celite and the filtrate was concentrated under vacuum. The crude residue was purified by column chromatography (neutral allumina, eluent: 100% CH2Cl2) to give the title product. UPLC-MS-5: Rt=2.75 min, MS m/z [M+H]+ 657.7.
To a solution of tert-butyl 6-(3-(4-(((tert-butyldiphenylsilyl)oxy)methyl)-2,2-dimethylpiperidin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 1, 2.10 g, 3.19 mmol) in dry THF (20 mL) under nitrogen atmosphere at 0° C. was added TBAF (1M in THF, 6.40 mL, 6.40 mmol) and the reaction mixture was stirred at RT for 2 h. After completion of the reaction, the RM was concentrated under reduced pressure, quenched with a sat. aq. NaHCO3 solution and extracted with EtOAc. The combined organic extracts were washed with water, brine, dried (Na2SO4), filtered and concentrated under vacuum. The crude residue purified by reverse phase chromatography (eluent: 40 to 50% CH3CN in H2O containing 0.025% NH3) to give the title compound Intermediate C114-rac. The enantiomers were separated by chiral preparative HPLC (C-HPLC-25; mobile phase: [n-Hexane+0.1% DEA]/[MeOH/IPA 50/50]: 90/10); flow rate: 18 mL/min) to give the first eluting enantiomer of the title compound: Intermediate C114a; C-HPLC-26 (mobile phase: [n-Hexane+0.1% DEA]/[MeOH/IPA 50/50]: 90/10): Rt=15.3 min, UPLC-MS-5: Rt=1.40 min; MS m/z [M+H]+ 419.4 and the second eluting enantiomer of the title compound: Intermediate C114b: C-HPLC-26 (mobile phase: [n-Hexane+0.1% DEA]/[MeOH/IPA 50/50]: 90/10): Rt=18.4 min, UPLC-MS-5: Rt=1.40 min; MS m/z [M+H]+ 419.4.
To a solution of (R)-4-(((tert-butyldiphenylsilyl)oxy)methyl)-2,2-dimethylpiperidine (Intermediate A85, 60 g, 157 mmol), tert-butyl 6-(3-bromo-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Intermediate C1, 53.3 g, 149 mmol), bis(3,5-bis(trifluoromethyl)phenyl)(2′,6′-bis(dimethylamino)-3,6-dimethoxybiphenyl-2-yl)phosphine (CAS [1810068-30-4], 6.00 g) in toluene (1.20 L) was added NaOtBu (2.0M in THF, 149 mL) and Pd(dba)2 (8.61 g, 14.9 mmol). The reaction mixture was stirred at 80° C. for 12 h. The RM was quenched by addition of an aq. solution of NaHCO3 (15.0%, 800 mL) and extracted with EtOAc (800 mL). The combined organic layers were washed three times with an aq. solution NaHCO3 (15.0%, 500 mL), dried (Na2SO4), filtered and concentrated under reduced pressure. The crude residue was purified by normal phase column chromatography (eluent: Petroleum ether/Ethyl acetate I/O to 0/1) to give the title compound as a yellow oil. LCMS-19: Rt=0.99 min, MS m/z [M+H]+ 657.2.
To a solution of tert-butyl (R)-6-(3-(4-(((tert-butyldiphenylsilyl)oxy)methyl)-2,2-dimethylpiperidin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 1, 152 g, 231 mmol) in THF (1.52 L) was added TBAF (1 M, 462 mL, 462 mmol). The reaction mixture was stirred at 25° C. for 2 h. The RM was quenched by addition of an aq. Solution of NaHCO3 (15.0%, 800 mL) and extracted with EtOAc (1000 mL). The combined organic layers were washed three times with an aq. Solution of NaHCO3 (15.0%, 500 mL), dried (Na2SO4), filtered and concentrated under reduced pressure. The crude residue was purified by normal phase chromatography (eluent: Petroleum ether/Ethyl acetate=1/0 to 0/1) to give the title compound as a yellow foam. UPLC-MS-4: Rt=0.70 min, MS m/z [M+H]+ 419.6.
An ice-cooled mixture of tert-butyl (R)-6-(3-(4-(hydroxymethyl)-2,2-dimethylpiperidin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Intermediate C115, 8.50 g, 20.3 mmol), NaHCO3 (3.41 g, 40.6 mmol) and Dess-Martin periodinane (11.2 g, 26.4 mmol) was vigorously stirred in CH2Cl2 (196 mL) and wet CH2Cl2 (476 μL of water in 4 mL of CH2Cl2) was added. The reaction mixture was stirred at RT for 40 min, Dess-Martin periodinane (4.31 g, 10.15 mmol) was added again and the RM further stirred for 50 min to complete the reaction. The mixture was diluted with Et2O (50 mL) and concentrated to a few mL of solvent. Et2O (150 mL) was added and the mixture was filtered over a pad of celite and washed with Et2O. The filtrate was poured into a 1/1 mixture of sat. aq. NaHCO3/aq. Na2S2O3 (10%), the layers were separated and the aqueous layer was back-extracted with Et2O (×2). The combined organic layers were washed with a sat. aq. NaHCO3 solution, dried (Na2SO4), filtered and concentrated under reduced pressure to give the title compound as a hygroscopic slightly brown foam which was used without purification in the next step. UPLC-MS-4: Rt=0.88 min; MS m/z [M+H]+ 417.5.
A solution of tert-butyl (R)-6-(3-(4-formyl-2,2-dimethylpiperidin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 1, 780 mg, 1.78 mmol) and morpholine (0.19 mL, 2.13 mmol) in dichloroethane (9 mL) was stirred under a nitrogen atmosphere at 0-5° C. for 10 min. Sodium triacetoxyborohydride (566 mg, 2.67 mmol) was added and the reaction mixture was stirred at 0-5° C. for 10 min. The RM was poured into a sat. aq. NaHCO3 solution and extracted with CH2Cl2 (×3). The combined organic layers were dried (phase separator) and concentrated. The crude residue was purified by normal phase chromatography (eluent: MeOH in CH2Cl2 0 to 8%) to give the title compound. UPLC-MS-4: Rt=0.62 min; MS m/z [M+H]+ 488.6.
A solution of tert-butyl (R)-6-(3-(4-formyl-2,2-dimethylpiperidin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (described in the synthesis of Intermediate C116 (Step 1), 1.21 mg, 2.90 mmol) and methylamine (2M in MeOH, 7.24 mL, 14.5 mmol) in dichloroethane (14.5 mL) was stirred under a nitrogen atmosphere at 0-5° C. for 10 min. Sodium triacetoxyborohydride (921 mg, 4.34 mmol) was added and the reaction mixture was stirred at RT for 14 h. Methylamine (2M in MeOH, 7.24 mL, 14.5 mmol) was added again followed by sodium triacetoxyborohydride (921 mg, 4.34 mmol) and the RM was stirred at RT for 5 h (this operation was repeated again). The RM was then poured into a sat. aq. NaHCO3 solution and extracted with CH2Cl2 (×3). The combined organic layers were dried (phase separator) and concentrated. The crude residue was used without purification in the next step. UPLC-MS-4: Rt=0.62 min; MS m/z [M+H]+ 432.6.
A solution of tert-butyl (R)-6-(3-(2,2-dimethyl-4-((methylamino)methyl)piperidin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 1, 1.25 g, 2.89 mmol), 4-methylpiperazine-1-sulfonyl chloride hydrochloride (0.74 g, 3.17 mmol) and DIPEA (1.51 mL, 8.66 mmol) in CH2Cl2 (14 mL) was stirred at RT for 5 h under nitrogen atmosphere. The reaction mixture was poured into an aq. sat. NaHCO3 solution and extracted with CH2Cl2 (×2). The combined organic extracts were dried (phase separator) and concentrated in vacuo. The crude residue was purified by normal phase chromatography (eluent: MeOH in CH2Cl2 from 0 to 10%) to give the title compound as a beige foam. UPLC-MS-4: Rt=0.66 min; MS m/z [M+H]+ 594.7.
A solution of tert-butyl (R)-6-(3-(4-formyl-2,2-dimethylpiperidin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (described in the synthesis of Intermediate C116 (Step 1), 2.50 g, 6.00 mmol) and rac-(4aR*,7aS)-4-methyl-octahydropyrrolo[3,4-b]morpholine (0.85 g, 6.00 mmol) in dichloroethane (20 mL) was stirred under a nitrogen atmosphere at 0-5° C. for 10 min. Sodium triacetoxyborohydride (3.82 g, 18.0 mmol) was added and the reaction mixture was stirred at 0-5° C. for 1 h. The RM was poured into a sat. aq. NaHCO3 solution and extracted with CH2Cl2 (×3). The combined organic layers were dried (phase separator) and concentrated. The crude residue was purified by normal phase chromatography (eluent: MeOH in CH2Cl2 0 to 10%) to give the title compound. The enantiomers were separated by chiral preparative SFC (C-SFC-7; mobile phase: CO2/[MeOH+0.025% NH3]: 60/40) to give the first eluting isomer of the title compound: Intermediate C118a: C-SFC-8 (mobile phase: CO2/[MeOH+0.025% NH3]: 70/30): Rt=2.05 min, UPLC-MS-4: Rt=0.60 min; MS m/z [M+H]+ 543.4 and the second eluting isomer of the title compound: Intermediate C118b: C-SFC-8 (mobile phase: CO2/[MeOH+0.025% NH3]: 70/30): Rt=2.73 min; UPLC-MS-4: Rt=0.60 min; MS m/z [M+H]+ 543.4 min.
The following examples C119 to C120 were prepared using analogous methods to the method-C118 from commercially available reagents.
To an ice-cooled stirred solution of (4aR*,7aS*)-octahydrofuro[3,4-b]pyrazine (500 mg, 3.71 mmol) in CH2Cl2 (15 mL) was added under argon DIPEA (5.18 mL, 29.6 mmol) and 1-[2-(trimethylsilyl)ethoxycarbonyl)pyrrolidin-2,5-dione (941 mg, 3.56 mmol) in CH2Cl2 (15 mL). The reaction mixture was stirred at RT for 17 h. The RM was poured into an aq. sat. NaHCO3 solution and extracted with CH2Cl2 (×3). The combined organic layers were dried (phase separator), concentrated and the crude residue was purified by normal phase chromatography (eluent: MeOH in CH2Cl2 from 0 to 6%) to give the title product as a colorless oil. UPLC-MS-4: Rt=0.58 min; MS m/z [M+H]+ 273.3.
To a solution of tert-butyl (R)-6-(3-(4-formyl-2,2-dimethylpiperidin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (described in the synthesis of Intermediate C116 (Step 1), 4.30 g, 9.81 mmol) in MeOH (60 mL) cooled at 0° C. was added under Ar rac-2-(trimethylsilyl)ethyl (4aS*,7aR*)-hexahydrofuro[3,4-b]pyrazine-1(2H)-carboxylate (Step 1, 2.85 g, 9.94 mmol) in MeOH (20 mL) and the reaction mixture was stirred at 0° C. for 30 min. Then, sodium triacetoxyborohydride (3.12 g, 14.7 mmol) was added and the RM was slowly allowed to warm to RT and stirred overnight. The RM was quenched with a sat. aq. NaHCO3 solution and extracted with EtOAc (×3). The combined organic layer was dried (phase separator), evaporated and the crude residue was purified by normal phase chromatography (eluent: 0 to 80% EtOAc in heptane). The diastereoisomers were separated by chiral preparative SFC (C-SFC-4; mobile phase: CO2/[IPA+0.025% NH3]: 78/22) to give the first eluting isomer of the title compound: Isomer 1: C-SFC-3 (mobile phase: CO2/[IPA+0.012% NH3]: 80/20): Rt=1.10 min, UPLC-MS-4: Rt=1.44 min; MS m/z [M+H]+ 673.6 and the second eluting isomer of the title compound: Isomer 2: C-SFC-3 (mobile phase: CO2/[IPA+0.012% NH3]: 70/30): Rt=2.81 min; UPLC-MS-4: Rt=1.42 min; MS m/z [M+H]+ 673.3.
To a solution of 2-(trimethylsilyl)ethyl (4aR*,7aS)-4-(((R)-1-(1-(2-(tert-butoxycarbonyl)-2-azaspiro[3.3]heptan-6-yl)-5-methyl-1H-pyrazol-3-yl)-2,2-dimethylpiperidin-4-yl)methyl)hexahydrofuro[3,4-b]pyrazine-1(2H)-carboxylate Isomer 2 (Step 2, 1.73 g, 2.44 mmol) in THF (25 mL) was added TBAF (1M in THF, 7.00 mL, 7.00 mmol) and the reaction mixture was stirred at RT for 1.5 h. The RM was diluted with 10% aq. NH4Cl solution and extracted with EtOAc (×2). The combined organic layer was washed with a sat. aq. NaHCO3 solution, with brine, dried (phase separator) and evaporated. The crude residue was purified by normal phase chromatography (eluent: MeOH in CH2Cl2 from 0 to 15%) to give the title product as a white foam. UPLC-MS-4: Rt=0.58 min; MS m/z [M+H]+ 529.6.
To a solution of tert-butyl 6-(3-((R)-4-(((4aS*,7aR*)-hexahydrofuro[3,4-b]pyrazin-1(2H)-yl)methyl)-2,2-dimethylpiperidin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate Isomer 2 (Step 3, 1.20 g, 2.15 mmol) in dichloroethane (25 mL), was added under Ar atmosphere oxetan-3-one (0.41 mL, 6.47 mmol) and the reaction mixture was stirred at RT for 3 min. Then, sodium triacetoxyborohydride (1.83 g, 8.62 mmol) was added and the RM was stirred at RT for 35 min. The RM was quenched by addition of a sat. aq. NaHCO3 solution and extracted with EtOAc (×2). The combined organic layer was washed with brine, dried (phase separator) and evaporated. The crude residue was purified by normal phase chromatography (eluent: MeOH in CH2Cl2 from 0 to 10%). UPLC-MS-4: Rt=0.73 min; MS m/z [M+H]+ 585.7.
The title compound was prepared by a method similar to that of tert-butyl 6-(3-((R)-2,2-dimethyl-4-(((4aS*,7aR*)-4-(oxetan-3-yl)hexahydrofuro[3,4-b]pyrazin-1(2H)-yl)methyl)piperidin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate Isomer 2 (Intermediate C121) using 2-(trimethylsilyl)ethyl (4aR*,7aS*)-4-(((R)-1-(1-(2-(tert-butoxycarbonyl)-2-azaspiro[3.3]heptan-6-yl)-5-methyl-1H-pyrazol-3-yl)-2,2-dimethylpiperidin-4-yl)methyl)hexahydrofuro[3,4-b]pyrazine-1(2H)-carboxylate Isomer 1. UPLC-MS-4: Rt=0.74 min; MS m/z [M+H]+ 585.7.
A solution of tert-butyl (R)-6-(3-(4-formyl-2,2-dimethylpiperidin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (described in the synthesis of Intermediate C116 (Step 1), 3.00 g, 7.20 mmol) and rac-(4aR*,7aS*-6-methyl-octahydro-1H-pyrrolo[3,4-B]pyridin-5-one (1.17 g, 7.56 mmol) in dichloroethane (20 mL) was stirred under a nitrogen atmosphere at 0-5° C. for 10 min. Sodium triacetoxyborohydride (4.58 g, 21.6 mmol) was added and the reaction mixture was stirred at 0-5° C. for 1 h. The RM was poured into a sat. aq. NaHCO3 solution and extracted with CH2Cl2 (×3). The combined organic layers were washed with a sat. aq. NaHCO3 solution, dried (phase separator) and concentrated. The crude residue was purified by normal phase chromatography (eluent: (EtOAc/EtOH 3/1) in c-Hexane 0 to 60%) to give the title compound. UPLC-MS-4: Rt=0.68 and 0.70 min; MS m/z [M+H]+ 555.7.
To an ice-cooled solution of tert-butyl 6-(3-((R)-2,2-dimethyl-4-(((4aR*,7aR*)-6-methyl-7-oxooctahydro-1H-pyrrolo[3,4-b]pyridin-1-yl)methyl)piperidin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 1, 2.39 g, 4.31 mmol) in THF (20 mL) was added NIS (1.02 g, 4.52 mmol) and the mixture was stirred under N2 atmosphere at 0° C. After completion (1 h), the reaction mixture was poured into 10% Na2S2O3 aq. solution and extracted with CH2Cl2 (×2). The combined organic layers were washed with an aq. sat. NaHCO3 solution, dried (phase separator) and concentrated. The crude residue was purified by normal phase chromatography (eluent: (EtOAc/EtOH 3/1) in c-Hexane 0 to 24%) to give the title product. The diastereoisomers were separated by chiral preparative SFC (C-SFC-5; mobile phase: CO2/[MeOH+0.025% NH3]: 80/20) to give the first eluting isomer of the title compound: Intermediate C123a: C-SFC-6 (mobile phase: CO2/[MeOH+0.025% NH3]: 80/20): Rt=2.31 min, UPLC-MS-4: Rt=1.08 min; MS m/z [M+H]+ 681.5 and the second eluting isomer of the title compound: Intermediate C123b: C-SFC-6 (mobile phase: CO2/[MeOH+0.025% NH3]: 70/30): Rt=1.08 min; UPLC-MS-4: Rt=2.74 min; MS m/z [M+H]+ 681.5 min.
Method-C123a: similar to Method-C123 except that Step 1 was performed in MeOH instead of Cl(CH2)2Cl.
The following examples C124 to C127 were prepared using analogous methods to Method-C123 from amines (in Step 1) described in the intermediates synthesis section A or commercially available.
To a solution of 2,2-dimethylpyrrolidin-3-yl)methanol (CAS [1538745-87-7], 2.20 g, 17.0 mmol) in CH2Cl2 (25 mL) at cooled to 0° C. was added imidazole (2.89 g, 42.6 mmol) followed by dropwise addition of TBDPS-chloride (7.00 g, 26.0 mmol) and the reaction mixture was stirred at RT for 16 h. A white solid precipitated and was filtered through a celite bed and washed with CH2Cl2. The filtrate was washed with water, brine, dried (Na2SO4), filtered and concentrated. The crude residue was purified by reverse phase chromatography (eluent: 35% CH3CN in water containing 0.1% NH3) to give the title as a pale yellow oil. UPLC-MS-17: Rt=4.68 min, MS m/z [M+H]+ 368.6.
A solution of tert-butyl 6-(3-bromo-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Intermediate C1, 4.00 g, 11.0 mmol) and 3-(((tert-butyldiphenylsilyl)oxy)methyl)-2,2-dimethylpyrrolidine (Step 1, 4.30 g, 12.0 mmol) in toluene (40 mL) was degassed with nitrogen for 10 min while stirring. Bis(3,5-bis(trifluoromethyl)phenyl)(2′,6′-bis(dimethylamino)-3,6-dimethoxybiphenyl-2-yl)phosphine (CAS: [1810068-30-4], 0.67 g, 0.90 mmol) and Pd(dba)2 (0.38 g, 0.67 mmol) were added followed by NaOtBu (2M in THF, 16.9 mL, 33.7 mmol) and the reaction mixture was stirred at 90° C. for 3 h. After completion of the reaction, the RM was diluted with EtOAc, filtered through a celite bed and washed with EtOAc. The filtrate was concentrated and the crude residue was purified by normal phase chromatography on neutral alumina (eluent: 3 to 7% EtOAc in hexane) to give the title compound. UPLC-MS-6: Rt=3.44 min, MS m/z [M+H]+ 643.8.
To a solution of tert-butyl 6-(3-(3-(((tert-butyldiphenylsilyl)oxy)methyl)-2,2-dimethylpyrrolidin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 2, 2.80 g, 4.40 mmol) in THF (30 mL) at 0° C. was added dropwise TBAF (1M in THF, 8.70 mL, 8.70 mmol) and the reaction mixture was stirred at RT for 8 h. After completion of the reaction, the RM was poured in ice-cold water and extracted with EtOAc (×2). The combined organic extracts were washed with water, brine, dried (Na2SO4), filtered and concentrated under vacuum. The crude residue was purified by reverse phase chromatography (eluent: CH3CN in water containing 0.1% of HCOOH from 40 to 60%) to give the title compound. UPLC-MS-9: Rt=1.14 min, MS m/z [M+H]+ 405.8.
To a solution of tert-butyl 6-(3-(3-(hydroxymethyl)-2,2-dimethylpyrrolidin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 3, 1.35 g, 3.34 mmol) in CH2Cl2 (15 mL) was added molecular sieves followed by NMO (0.97 g, 8.34 mmol). The reaction mixture was cooled to 0° C., TPAP (0.12 g, 0.33 mmol) was added and reaction mixture was allowed to reach RT and stirred at RT for 4 h. The RM was filtered through a pad of celite and washed with excess of CH2Cl2. The filtrate was washed with cold water, brine, dried (Na2SO4), filtered and concentrated under vacuum to give the title compound which was used without purification in the next step. UPLC-MS-9: Rt=1.41 min, MS m/z [M+H]+ 403.5.
A solution of tert-butyl 6-(3-(3-formyl-2,2-dimethylpyrrolidin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 4, 1.15 g, 2.86 mmol) and morpholine (0.37 g, 4.28 mmol) in dichloroethane (15 mL) was allowed to stirret at RT for 2 h. The reaction mixture was cooled to 0° C. and NaBH(OAc)3 (1.51 g, 7.14 mmol) was added. The RM was then allowed to reached RT and was stirred for 16 h. After completion of the reaction, the RM was poured into ice-cold water, neutralized with NaHCO3 and extracted with EtOAc. The combined organic extracts were was washed with water, brine, dried (Na2SO4), filtered and concentrated under vacuum. The crude residue was purified by reverse phase chromatography (eluent: CH3CN in water+0.1% formic acid from 55 to 60%) to give the title compound. The enantiomers were separated by chiral preparative SFC C-SFC-52; mobile phase: CO2/[IPA+0.1% Et2NH]: 82/18) to give the first eluting isomer of the title compound: Intermediate C128a: C-SFC-53 (mobile phase: CO2/[IPA+0.1% Et2NH]: 75/25): Rt=5.77 min, UPLC-MS-9: Rt=1.10 min, MS m/z [M+H]+ 475.0 and the second eluting isomer of the title compound: Intermediate C128b: C-SFC-53 (mobile phase: CO2/[IPA+0.1% Et2NH]: 75/25): Rt=6.54 min; UPLC-MS-9: Rt=1.10 min, MS m/z [M+H]+ 475.0.
To a suspension of sodium hydride (60% in mineral oil, 862 mg, 21.5 mmol) in DMSO (60 mL) under Ar was added at 0° C. trimethylsulfoxonium iodide (4.84 g, 21.5 mmol). The reaction mixture was allowed to reach RT and stirred for 1 h. The reaction mixture was cooled to 0° C. and tert-butyl 6-(3-(2,2-dimethyl-4-oxopiperidin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Intermediate C74, 5.90 g, 14.4 mmol) was added. The RM was allowed to reach RT and stirred for 3 h. The RM was quenched by addition of a sat. aq. NaHCO3 solution and extracted with EtOAc (×2). The combined organic extracts were washed with brine, dried (phase separator) and evaporated. The crude residue was purified by normal phase chromatography (eluent: EtOAc in n-heptane from 0 to 100%) to give the title compound as a gum. UPLC-MS-4: Rt=1.06 min; MS m/z [M+H]+ 417.5.
To a solution of tert-butyl 6-(3-(5,5-dimethyl-1-oxa-6-azaspiro[2.5]octan-6-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Step 1, 1.03 g, 2.22 mmol) in dimethylacetamide (10 mL) was added morpholine (0.45 mL, 5.10 mmol) and the reaction mixture was heated at 130° C. under microwave irradiations for 2 h. Morpholine (0.45 mL, 5.10 mmol) was added again and the mixture was further heated at 130° C. for 6 h. The RM was diluted with a sat. aq. NaHCO3 solution and extracted with EtOAc (×2). The combined organic extracts were washed with brine, dried (phase separator) and evaporated. The crude residue was purified by normal phase chromatography (eluent: MeOH in CH2Cl2 from 0 to 4%) to give the title compound as a racemic mixture. The enantiomers were separated by chiral SFC (C-SFC-7; mobile phase: CO2/[MeOH+0.025% NH3]: 75/35) to give the first eluting enantiomer of the title compound: Intermediate C129a; C-SFC-8 (mobile phase: CO2/[MeOH+0.025% NH3]: 75/35): Rt=1.62 min, UPLC-MS-4: Rt=0.68 min; MS m/z [M+H]+ 504.6 and the second eluting enantiomer of the title compound: Intermediate C129b: C-SFC-8 (mobile phase: CO2/[MeOH+0.025% NH3]: 75/35): Rt=2.32 min, UPLC-MS-4: Rt=0.70 min; MS m/z [M+H]+ 504.5.
A solution of tert-butyl 6-(3-bromo-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Intermediate C1, 0.90 g, 2.53 mmol) and 4-((2-(methoxymethyl)-2-methylpiperidin-4-yl)methyl)morpholine (Intermediate A86, 0.67 g, 2.78 mmol) in toluene (10 mL) was degassed with nitrogen for 10 min. Bis(3,5-bis(trifluoromethyl)phenyl)(2′,6′-bis(dimethylamino)-3,6-dimethoxybiphenyl-2-yl)phosphine (CAS [1810068-30-4], 0.15 g, 0.20 mmol) and Pd(dba)2 (0.09 g, 0.15 mmol) were added followed by NaOtBu (2M in THF, 5.06 mL, 10.1 mmol) and the reaction mixture was stirred at 85° C. for 8 h. After completion of the reaction, the RM was diluted with EtOAc, filtered through a pad of celite and washed with EtOAc. The filtrate was concentrated under vacuum and the crude residue was purified by normal phase chromatography on neutral alumina (eluent: 25 to 30% EtOAc in hexane) to give the first eluting isomer of the title compound: Isomer-1 as a racemate: UPLC-MS-18 (mobile phase: A: 10 mM ammonium acetate in water/B: CH3CN, gradient: 70/30 at 0.01 min, 50/50 at 10 min, 30/70 at 22 min, 0/100 at 26 min): Rt=15.80 min and the second eluting isomer of the title compound isomer-2 as a racemate: UPLC-MS-18 (mobile phase: A: 10 mM ammonium acetate in water/B: CH3CN, gradient: 70/30 at 0.01 min, 50/50 at 10 min, 30/70 at 22 min, 0/100 at 26 min): Rt=15.40 min.
Tert-butyl 6-(3-(2-(methoxymethyl)-2-methyl-4-(morpholinomethyl)piperidin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate Isomer-1 was further purified by preparative chiral HPLC (C-HPLC-28 (mobile Phase: MeOH containing 0.1% DEA) to give the first eluting enantiomer: Intermediate C130a: UPLC-MS-16: Rt=3.98 min, MS m/z [M+H]+ 518.4; C-HPLC-29 (mobile Phase: 100% MeOH), Rt=6.05 min and the second eluting enantiomer: Intermediate C130b: UPLC-MS-16: Rt=3.98 min, MS m/z [M+H]+ 518.4; C-HPLC-29 (mobile Phase: 100% MeOH), Rt=7.24 min.
Tert-butyl 6-(3-(2-(methoxymethyl)-2-methyl-4-(morpholinomethyl)piperidin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate Isomer-2 was further purified by preparative chiral HPLC (C-HPLC-25 (mobile phase: [n-Hexane+0.1% DEA]/IPA:MeOH (50:50), isocratic 82/18), flow rate: 22 mL/min) to give the first eluting enantiomer: Intermediate C130c: UPLC-MS-9: Rt=1.07 min, MS m/z [M+H]+ 518.4; C-SFC-48 (mobile phase: CO2/[MeOH+0.1% DEA], gradient: 5 to 50%), Rt=4.97 min and the second eluting enantiomer: Intermediate C130d: UPLC-MS-9: Rt=1.07 min, MS m/z [M+H]+ 518.4; C-SFC-48 (mobile phase: CO2/[MeOH+0.1% DEA], gradient: 5 to 50%), Rt=5.23 min.
The title compound was prepared by a method similar to that of tert-butyl 6-(3-(2-(methoxymethyl)-2-methyl-4-(morpholinomethyl)piperidin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate (Intermediate C130) using 4-((2-ethyl-2-methylpiperidin-4-yl)methyl)morpholine (Intermediate A87) instead of 4-((2-(methoxymethyl)-2-methylpiperidin-4-yl)methyl)morpholine (Intermediate A86). The crude residue was purified by normal phase chromatography on neutral alumina (eluent: 50 to 80% EtOAc in hexane) to give the title compound as a mixture of 4 diastereosiomers. The diastereoisomers were separated by reverse phase preparative HPLC (RP-HPLC-5 (mobile phase: A: [5 mM ammonium bicarbonate+0.1% NH3 in Water]/B: CH3CN, gradient: 50 to 55% B in 34 min, 55 to 100% B in 2 min, 100 to 50% B in 6 min) to give the first eluting Isomer-1 as a racemate of the title compound: Isomer-1: UPLC-MS-16: Rt=4.40 min, MS m/z [M+H]+ 502.4 and the second eluting isomer of the title compound isomer-2 as a racemate: UPLC-MS-16: Rt=4.55 min, MS m/z [M+H]+ 502.4.
Tert-butyl 6-(3-(2-ethyl-2-methyl-4-(morpholinomethyl)piperidin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate Isomer-1 was further purified by
preparative chiral HPLC (C-HPLC-28 (mobile phase: [MeOH+0.1% DEA]/CH3CN 97/3; flow rate: 15 mL/min) to give the first eluting enantiomer: Intermediate C131a: UPLC-MS-9: Rt=1.07 min, MS m/z [M+H]+ 502.8; C-SFC-48 (mobile phase: CO2/[MeOH+0.1% DEA], gradient: 5 to 50%), Rt=4.97 min and the second eluting enantiomer: Intermediate C131b: UPLC-MS-9: Rt=1.09 min, MS m/z [M+H]+ 502.8; C-SFC-48 (mobile phase: CO2/[MeOH+0.1% DEA], gradient: 5 to 50%), Rt=5.23 min.
Tert-butyl 6-(3-(2-ethyl-2-methyl-4-(morpholinomethyl)piperidin-1-yl)-5-methyl-1H-pyrazol-1-yl)-2-azaspiro[3.3]heptane-2-carboxylate Isomer-2 was further purified by preparative chiral HPLC (C-SFC-52 (mobile phase: CO2/[MeOH+0.1% DEA: CH3CN (50:50)], isocratic: 85/15) to give the first eluting enantiomer: Intermediate C131c: UPLC-MS-9: Rt=1.08 min, MS m/z [M+H]+ 502.8; C-SFC-48 (mobile phase: CO2/[MeOH+0.1% DEA], gradient: 5 to 50%), Rt=5.00 min and the second eluting enantiomer: Intermediate C131d: UPLC-MS-9: Rt=1.09 min, MS m/z [M+H]+ 502.8, C-SFC-48 (mobile phase: CO2/[MeOH+0.1% DEA], gradient: 5 to 50%), Rt=5.22 min.
To an ice-cooled solution of 2-chloro-1,4-dimethylbenzene (3.40 kg, 24.2 mol) in AcOH (20.0 L) was added H2SO4 (4.74 kg, 48.4. mol, 2.58 L) followed by a dropwise addition (dropping funnel) of a cold solution of HNO3 (3.41 kg, 36.3 mol, 2.44 L, 67.0% purity) in H2SO4 (19.0 kg, 193. mol, 10.3 L). The reaction mixture was then allowed to stir at 0-5° C. for 0.5 h. The reaction mixture was poured slowly into crushed ice (35.0 L) and the yellow solid precipitated out. The suspension was filtered and the cake was washed with water (5.00 L×5) to give a yellow solid which was suspended in MTBE (2.00 L) for 1 h, filtered, and dried to give the title compound as a yellow solid. 1H NMR (400 MHz, CDCl3) δ 7.90 (s, 1H), 7.34 (s, 1H), 2.57 (s, 3H), 2.42 (s, 3H).
To a cooled solution of 1-chloro-2,5-dimethyl-4-nitrobenzene (Step 1, 2.00 kg, 10.8 mol) in TFA (10.5 L) was slowly added concentrated H2SO4 (4.23 kg, 43.1 mol, 2.30 L) and the reaction mixture was stirred at 20° C. NBS (1.92 kg, 10.8 mol) was added in small portions and the reaction mixture was heated at 55° C. for 2 h. The reaction mixture was cooled to 25° C., then poured into crushed ice solution to obtain a pale white precipitate which was filtered through vacuum, washed with cold water and dried under vacuum to give the title compound (yellow solid) which was used without further purification in the next step. 1H NMR (400 MHz, CDCl3) δ 7.65 (s, 1H), 2.60 (s, 3H), 2.49 (s, 3H).
To a ice-cooled solution of 3-bromo-2-chloro-1,4-dimethyl-5-nitrobenzene (Step 2, 2.75 kg, 10.4 mol) in THF (27.5 L) was added HCl (4M, 15.6 L) then Zinc (2.72 kg, 41.6 mol) in small portions. The reaction mixture was allowed to stir at 25° C. for 2 h. The reaction mixture was basified by addition of a sat. aq. NaHCO3 solution (until pH=8). The mixture was diluted with EtOAc (2.50 L) and stirred vigorously for 10 min and then filtered through a pad of celite. The organic layer was separated and the aqueous layer was re-extracted with EtOAc (3.00 L×4). The combined organic layers were washed with brine (10.0 L), dried (Na2SO4), filtered and concentrated under vacuum to give the title compound as a yellow solid which was used without further purification in the next step. 1H NMR (400 MHz, DMSO-d6) δ 6.59 (s, 1H), 5.23 (s, 2H), 2.22 (s, 3H), 2.18 (s, 3H).
BF3·Et2O (2.00 kg, 14.1 mol, 1.74 L) was dissolved in CH2Cl2 (20.0 L) and cooled to −5 to −10° C. under nitrogen atmosphere. A solution of 3-bromo-4-chloro-2,5-dimethylaniline (Step 3, 2.20 kg, 9.38 mol) in CH2Cl2 (5.00 L) was added to above reaction mixture and stirred for 0.5 h. Tert-butyl nitrite (1.16 kg, 11.3 mol, 1.34 L) was added dropwise and the reaction mixture was stirred at the same temperature for 1.5 h. TLC (petroleum ether:EtOAc=5:1) showed consumption of the starting material (Rf=0.45). MTBE (3.00 L) was added to the reaction mixture to give a yellow precipitate, which was filtered through vacuum and washed with cold MTBE (1.50 L×2) to give the title compound as a yellow solid which was used without further purification in the next step.
To 18-Crown-6 ether (744 g, 2.82 mol) in chloroform (20.0 L) was added KOAc (1.29 kg, 13.2 mol) and the reaction mixture was cooled to 20° C. Then 3-bromo-4-chloro-2,5-dimethylbenzenediazonium tetrafluoroborate (Step 4, 3.13 kg, 9.39 mol) was added slowly. The reaction mixture was then allowed to stir at 25° C. for 5 h. After completion of the reaction, the reaction mixture was poured into ice cold water (10.0 L) and the aqueous layer was extracted with CH2Cl2 (5.00 L×3). The combined organic layers were washed with a sat. aq. NaHCO3 solution (5.00 L), brine (5.00 L), dried (Na2SO4), filtered and concentrated under vacuum to give the title compound as a yellow solid. 1H NMR (600 MHz, CDCl3) δ 10.42 (br s, 1H), 8.04 (s, 1H), 7.35 (s, 1H), 2.58 (s, 3H). UPLC-MS-1a: Rt=1.02 min; MS m/z [M+H]+ 243/245/247.
To a solution of PTSA (89.8 g, 521 mmol) and 4-bromo-5-chloro-6-methyl-1H-indazole (Step 5, 1.28 kg, 5.21 mol) in CH2Cl2 (12.0 L) was added DHP (658 g, 7.82 mol, 715 mL) dropwise at 25° C. The mixture was stirred at 25° C. for 1 h. After completion of the reaction, the reaction mixture was diluted with water (5.00 L) and the organic layer was separated. The aqueous layer was re-extracted with CH2Cl2 (2.00 L). The combined organic layers were washed with a sat. aq. NaHCO3 solution (1.50 L), brine (1.50 L), dried (Na2SO4), filtered and concentrated under vacuum. The crude residue was purified by normal phase chromatography (eluent: Petroleum ether/EtOAc from 100/1 to 10/1) to give the title compound as a yellow solid. 1H NMR (600 MHz, DMSO-d6) δ 8.04 (s, 1H), 7.81 (s, 1H), 5.88-5.79 (m, 1H), 3.92-3.83 (m, 1H), 3.80-3.68 (m, 1H), 2.53 (s, 3H), 2.40-2.32 (m, 1H), 2.06-1.99 (m, 1H), 1.99-1.93 (m, 1H), 1.77-1.69 (m, 1H), 1.60-1.56 (m, 2H). UPLC-MS-2b: Rt=1.32 min; MS m/z [M+H]+ 329.0/331.0/333.0.
A suspension of 4-bromo-5-chloro-6-methyl-1-(tetrahydro-2H-pyran-2-yl)-1H-indazole (Step 6, 450 g, 1.37 mol), KOAc (401 g, 4.10 mol) and B2Pin2 (520 g, 2.05 mol) in 1,4-dioxane (3.60 L) was degassed with nitrogen for 0.5 h. Pd(dppf)Cl2·CH2Cl2 (55.7 g, 68.3 mmol) was added and the reaction mixture was stirred at 90° C. for 6 h. The reaction mixture was filtered through diatomite and the filtered cake was washed with EtOAc (1.50 L×3). The mixture was concentrated under vacuum to give a black oil which was purified by normal phase chromatography (eluent: Petroleum ether/EtOAc from 100/1 to 10/1) to give the desired product as brown oil. The residue was suspended in petroleum ether (250 mL) for 1 h to obtain a white precipitate. The suspension was filtered, dried under vacuum to give the title compound as a white solid. UPLC-MS-2a: Rt=1.27 min; MS m/z [M+H]+ 377.1/379.
A stirred solution of 4-bromo-5-chloro-6-methyl-1H-indazole (Intermediate D2, 240 g, 977 mmol) in THF (2.40 L) was treated with NaH (43.0 g, 1.08 mol, 60.0% in mineral oil) under nitrogen atmosphere and the reaction mixture was stirred at 0° C. for 30 min. Then the reaction mixture was treated with TsCl (195 g, 1.03 mol) and stirred at 0° C. for 1 h. The RM was quenched with water (1.00 L), diluted and extracted with EtOAc (1.00 L×3). The combined organic layers were washed with water, brine, dried (MgSO4), filtered and concentrated under vacuum. The residue was suspended in MTBE (200 mL) for 20 min to give the title compound an off-white solid. 1H NMR (400 MHz, DMSO-d6) δ 8.49 (s, 1H), 8.16 (s, 1H), 7.91-7.83 (m, 2H), 7.47-7.37 (m, 2H), 2.61 (s, 3H), 2.35 (s, 3H). UPLC-MS-1a: Rt=1.42 min; MS m/z [M+H]+ 399.1/401.1/403.1.
A suspension of 4-bromo-5-chloro-6-methyl-1-tosyl-1H-indazole (Step 1, 370 g, 925 mmol), KOAc (272 g, 2.78 mol) and B2Pin2 (470 g, 1.85 mol) in 1,4-dioxane (3.00 L) was degassed with nitrogen for 30 min. Pd(dppf)Cl2·CH2Cl2 (75.6 g, 92.6 mmol) was added and the reaction mixture was stirred at 100° C. for 4 h. The reaction mixture was filtered through diatomite and the filtered cake was washed with EtOAc (1.50 L). The filtrate was concentrated under vacuum to give a black oil which was filtered through silica gel and then the residue was suspended in EtOAc (500 mL) at 60° C. for 1 h. The mixture was cooled to 25° C. and a solid was precipitated out. The solid was filtered and dried under vacuum to give the title compound as a light yellow solid. 1H NMR (600 MHz, DMSO-d6) δ 8.45 (s, 1H), 8.21 (s, 1H), 7.81 (d, 2H), 7.39 (d, 2H), 2.53 (s, 3H), 2.33 (s, 3H), 1.34 (s, 12H); UPLC-MS-2c: Rt=1.27 min; MS m/z [M+H]+ 447.1/449.2.
To an ice-cooled solution of 1,2,4-trimethylbenzene (1000 g, 8.32 mol) in Ac2O (5.0 L) was added dropwise a cold solution of HNO3 (847 g, 9.27 mol, 605 mL, 69.0% purity) in Ac2O (1.00 L) by using a dropping funnel over a period of 30 min. The reaction mixture was then allowed to stir at 0° C. for 30 min. The RM was allowed to warm gradually to 25° C. and stirred for 2 h. The RM was poured slowly into H2O (4.00 L) and stirred for 15 min. The aqueous phase was extracted with EtOAc (2.00 L×3). The combined organic phase was washed with brine (2.00 L×2), dried (Na2SO4), filtered and concentrated in vacuum. The crude product was purified by normal phase chromatography (eluent: Petroleum ether/EtOAc 100:1 to 100:5). 1H NMR (400 MHz, CDCl3) δ 7.80 (s, 1H), 7.08 (s, 1H), 2.55 (s, 3H), 2.30 (s, 3H), 2.29 (s, 3H).
To a cooled solution of 1,2,4-trimethyl-5-nitrobenzene (450 g, 2.72 mol) in TFA (1.58 L) was slowly added H2SO4 (450 mL) followed by portionwise addition of NBS (485 g, 2.72 mol) and the reaction mixture was heated at 55° C. for 2 h. The RM was quenched with crushed ice (4.00 kg) to obtain a brown solid which was filtered through vacuum, washed with cold water and dried under vacuum to give the title compound which was used into the next step without further purification. 1H NMR (400 MHz, CDCl3) δ 7.55 (s, 1H), 2.57 (s, 3H), 2.46 (s, 3H), 2.39 (s, 3H).
To an ice-cooled solution of 3-bromo-1,2,4-trimethyl-5-nitrobenzene (Step 2, 480 g, 1.97 mol) in THF (3.84 L) was added HCl (4M, 1.72 L) followed by Zinc (465 g, 7.10 mol) in small portions. The reaction mixture was allowed to warm slowly to 25° C. and stirred for 2 h. The RM was basified with an aq. sat NaHCO3 solution until pH=8. The mixture was diluted with EtOAc (500 mL), stirred vigorously for 10 min and then filtered through a celite pad. The organic layer was separated and the aqueous layer was re-extracted with EtOAc (1.50 L×3). The combined organic layers were washed with brine, dried (Na2SO4), filtered and concentrated under reduced pressure to give the title compound which was used into the next step without further purification. 1H NMR (400 MHz, CDCl3) δ 6.49 (s, 1H), 3.71-3.40 (m, 2H), 2.31 (s, 3H), 2.29 (s, 3H), 2.24 (s, 3H).
The title compound was prepared by a method similar to that of Intermediate D1, Step 4 by replacing 3-bromo-4-chloro-2,5-dimethylaniline with 3-bromo-2,4,5-trimethylaniline (Step 3, 400 g, 1.87 mol). The title compound was used without further purification in the next step.
The title compound was prepared by a method similar to that of Intermediate D1, Step 5 by replacing 3-bromo-4-chloro-2,5-dimethylbenzenediazonium tetrafluoroborate with 3-bromo-2,4,5-trimethylbenzenediazonium tetrafluoroborate (Step 4). The crude product was purified by normal phase chromatography (eluent: Petroleum ether/EtOAc=100/1 to 10/1). 1H NMR (400 MHz, CDCl3) δ 10.07 (br s, 1H), 8.00 (s, 1H), 7.24 (s, 1H), 2.46 (s, 6H).
To an ice-cooled solution of 4-bromo-5,6-dimethyl-1H-indazole (71.0 g, 315 mmol) in THF (710 mL) was added NaH (13.9 g, 347 mmol, 60% in mineral oil) under N2 and the reaction mixture was stirred at 0° C. for 0.5 h followed by the addition of Ts-Cl (63.1 g, 331 mmol). The RM was stirred at 0° C. for 1 h, then poured into ice cold water (2.00 L), extracted with EtOAc (1.00 L×3). The combined organic layers were washed with brine (1.00 L), dried (Na2SO4), filtered and concentrated under reduced pressure. The crude residue was suspended in methyl t-butyl ether (500 mL) and stirred for 20 min to give the title after filtration the title compound as yellow solid. 1H NMR (400 MHz, CDCl3) δ 8.10 (s, 1H), 7.95 (m, 1H), 7.88-7.83 (m, 2H), 7.25 (m, 2H), 2.51 (s, 3H), 2.43 (s, 3H), 2.37 (s, 3H).
To a solution of 4-bromo-5,6-dimethyl-1-tosyl-1H-indazole (93.0 g, 245 mmol) in 1,4-dioxane (60.0 mL) was added KOAc (72.2 g, 736 mmol), Pin2B2 (74.7 g, 294 mmol) and Pd(dppf)Cl2·CH2Cl2 (20.0 g, 24.5 mmol) under N2. The reaction mixture was stirred at 100° C. for 12 h. The RM was filtered through diatomite and the filtered cake washed with EtOAc (1.50 L×3). The filtrate was concentrated under reduce pressure and the crude residue was purified by column chromatography (eluent: Petroleum ether/EtOAc=100/1 to 10/1). Then the solid was triturated with CH2Cl2 (100 mL) and MeOH (500 mL) at 35° C. for 30 min to give the title compound as a yellow solid. 1H NMR (600 MHz, CDCl3) δ. 8.51 (s, 1H), 8.09 (s, 1H), 7.89-7.76 (m, 2H), 7.27-7.17 (m, 2H), 2.55 (s, 3H), 2.47 (s, 3H), 2.36 (s, 3H), 1.40 (s, 12H). UPLC-MS-2b: Rt=1.30 min; MS m/z [M+H]+ 427.3.
The title compound was prepared by a method similar to Step 1 in the synthesis of Intermediate D1 by replacing 2-chloro-1,4-dimethylbenzene with 1,2-dichloro-4-methylbenzene. 1H NMR (400 MHz, CDCl3) δ 8.08 (s, 1H), 7.43 (s, 1H), 2.56 (s, 3H).
The title compound was prepared by a method similar to Step 2 in the synthesis of Intermediate D1 by replacing 1-chloro-2,5-dimethyl-4-nitrobenzene with 1,2-dichloro-4-methyl-5-nitrobenzene. 1H NMR (400 MHz, CDCl3) δ 7.90 (s, 1H), 2.62 (s, 3H).
To a solution of 3-bromo-1,2-dichloro-4-methyl-5-nitrobenzene (Step 2, 3.45 kg, 12.1 mol) in MeOH (27.0 L) was added SnCl2·2H2O (8.20 kg, 36.3 mol) and the reaction mixture was stirred at 65° C. for 10 h. TLC (petroleum ether:EtOAc=5:1) indicated consumption of the starting material (Rf=0.49). The pH of the mixture was adjusted to pH=8 by addition of 20.0% aq. NaOH solution (10.0 L) at 0-10° C. and the mixture was extracted with EtOAc (5.00 L×8). The combined organic layers were washed with brine (5.00 L×2), dried (Na2SO4), filtered and concentrated under vacuum. The crude residue was triturated with petroleum ether (2.00 L) at 25° C. for 12 h to give the title compound as a yellow solid. 1H NMR (400 MHz, CDCl3) δ 6.77 (s, 1H), 3.61-3.89 (m, 2H), 2.30 (s, 3H).
To an ice-cooled solution of 3-bromo-4,5-dichloro-2-methylaniline (Step 3, 1.70 kg, 6.67 mol) in HCl (6M, 17.4 L, 105 mmol) stirred for 30 min was added dropwise an ice-cooled solution of NaNO2 (506 g, 7.34 mol) in H2O (1.20 L) while maintaining a temperature at 0° C. The resulting mixture was stirred for 1 h. HBF4 (9.22 kg, 42.0 mol, 6.54 L, 40.0% purity) was added dropwise and the reaction mixture was stirred at 0° C. for 30 min. TLC (petroleum ether:EtOAc=5:1) indicated consumption of the starting material (Rf=0.39). The resulting precipitate was filtered through vacuum, washed with cold water (2.00 L) and MTBE (2.00 L) and then dried under vacuum to obtain the diazonium salt as a pale yellow solid. The crude product was triturated with MTBE (1.00 L) at 25° C. for 30 min to give the title compound as a yellow solid which was used without further purification in the next step.
The title compound was prepared by a method similar to that of Intermediate D1, Step 5 by replacing 3-bromo-4-chloro-2,5-dimethylbenzenediazonium tetrafluoroborate with 3-bromo-4,5-dichloro-2-methylbenzenediazonium trifluoro(hydroxy)borate. 1H NMR (400 MHz, DMSO-d6) δ 13.71 (br s, 1H), 8.10 (s, 1H), 7.94 (s, 1H); UPLC-MS-1c: Rt=1.18 min; MS m/z [M+H]− 262.9/264.9/266.8/268.8.
The title compound was prepared by a method similar to Step 6 in the synthesis of Intermediate D1 by replacing 4-bromo-5-chloro-6-methyl-1H-indazole with 4-bromo-5,6-dichloro-1H-indazole. 1H NMR (400 MHz, DMSO-d6) δ 8.22 (s, 1H), 8.13 (s, 1H), 5.91-5.88 (m, 1H), 3.90-3.83 (m, 1H), 3.81-3.72 (m, 1H), 2.40-2.27 (m, 1H), 2.07-1.92 (m, 2H), 1.78-1.65 (m, 1H), 1.62-1.52 (m, 2H); UPLC-MS-1c: Rt=1.55 min; MS m/z [M+H]+ 349.1/351.0/353.0.
The title compound was prepared by a method similar to Step 7 in the synthesis of Intermediate D1, Step 7 by replacing 4-bromo-5-chloro-6-methyl-1-(tetrahydro-2H-pyran-2-yl)-1H-indazole with 4-bromo-5,6-dichloro-1-(tetrahydro-2H-pyran-2-yl)-1H-indazole. 1H NMR (400 MHz, DMSO-d6) δ 8.23 (s, 1H), 8.16 (s, 1H), 5.90-5.87 (m, 1H), 3.89-3.71 (m, 2H), 2.41-2.28 (m, 1H), 2.07-1.90 (m, 2H), 1.78-1.65 (m, 1H), 1.62-1.52 (m, 2H), 1.38 (s, 12H); UPLC-MS-1c: Rt=1.53 min; MS m/z [M+H]+ 395.3/397.3/399.3.
To a solution of 4-bromo-5-chloro-1H-indazole (250 g, 1.08 mol) in CH2Cl2 (2.50 L) were added pTSA (9.30 g, 54.0 mmol) followed by DHP (273 g, 3.24 mol, 296 mL). The reaction mixture was stirred at 25° C. for 1 h. The RM was poured into a sat. aq. NaHCO3 solution (1 L), washed with brine and dried (Na2SO4), filtered and concentrated in vacuum. The crude product was triturated in Petroleum ether (500 mL) and collected by filtration to give the title product. UPLC-MS-1a: Rt=1.28 min; MS m/z [M+H]+ 315/317/319.
A solution of 4-bromo-5-chloro-1-(tetrahydro-2H-pyran-2-yl)-1H-indazole (step 1, 320 g, 1.01 mol), B2Pin2 (283 g, 1.12 mol) and KOAc (299 g, 3.04 mol) in 1,4-dioxane (1.39 L) was degassed with N2. Then Pd(dppf)Cl2·CH2Cl2 (24.8 g, 30.4 mmol) was added and the reaction mixture was stirred at 110° C. for 18 h. The mixture was filtered, the cake was washed with EtOAc (10 L) and the filtrate was concentrated in vacuum. The crude product was purified by normal phase chromatography (eluent: EtOAc in petroleum ether from 0 to 50%) to give the title compound. UPLC-MS-1a: Rt=1.35 min; MS m/z [M+H]+ 363/365.
To a suspension of 2-chloro-5-methyl-4-nitroanisole (10.0 g, 49.6 mmol) in TFA (30 mL) and conc. H2SO4 (10 mL) at 0° C., was added N-bromosuccinimide (8.76 g, 49.6 mmol) portion wise, under nitrogen atmosphere. The reaction mixture was stirred at 50° C. for 2 h. After completion of the reaction, the RM was quenched with a cold bicarbonate water solution to adjust pH 6-7 and extracted with Et2O. The combined organic layer was washed by brine, dried (Na2SO4), filtered concentrated under reduced pressure. The crude residue was directly used in the next step without any further purification. 1H NMR (400 MHz, CDCl3) δ 7.91 (s, 1H), 3.96 (s, 3H), 2.61 (s, 3H).
3-Bromo-1-chloro-2-methoxy-4-methyl-5-nitrobenzene (Step 1, 12.2 g, 43.57 mmol) was dissolved in (MeOH:H2O) (70 mL: 30 mL), sodium sulphide (10.2 g, 130.7 mmol) was added portion wise at RT and the reaction mixture was stirred for 16 h at 60° C. After completion of the reaction, the RM was quenched with cold water, filtered through a celite pad and the filtrate was extracted by EtOAc. The combined organic layer was washed with brine, dried (Na2SO4), filtered and concentrated under reduced pressure. The crude residue was purified by reverse phase chromatography (eluent: 65 to 70% CH3CN in H2O containing 0.1% formic acid) to give the title product as yellow solid. 1H NMR (400 MHz, DMSO) δ 6.72 (s, 1H), 5.24 (s, 2H), 3.65 (s, 3H), 2.14 (s, 3H).
3-Bromo-5-chloro-4-methoxy-2-methylaniline (Step 2, 6.80 g, 27.2 mmol) was dissolved in THF (60 mL) and cooled to 0° C., HCl (6N, 68 mL) was added drop wise and the mixture was stirred for 10 min. Then NaNO2 (2.27 g, 32.6 mmol) in a minimum amount of water was added drop wise and the reaction mixture was stirred at 0° C. for 15 min. HBF4 (50% in water, 21 mL) was added drop wise and the RM was stirred at 0° C. for 30 min. A precipitate formed and was filtered, washed with cold water, with hexane and then was dried under vacuum to give the diazonium salt intermediate as a yellow solid. The solid was dissolved in chloroform (100 mL), the solution was cooled to 0° C. and 18-crown-6 ether (7.26 g, 27.2 mmol) followed by potassium acetate (4.04 g, 41.3 mmol) were added portion wise. The reaction mixture was stirred at 0° C. for 30 min. After completion of the reaction, the RM was poured into CH2Cl2 and washed with water and brine. The organic layer was dried (Na2SO4), filtered and concentrated under vacuum. The crude residue was purified by normal phase chromatography (eluent: 20% EtOAc in hexane) to give the title product as light yellow solid. 1H NMR (400 MHz, DMSO) δ 13.5 (s, 1H), 8.03 (s, 1H), 7.77 (s, 1H), 3.82 (s, 3H).
4-Bromo-6-chloro-5-methoxy-1H-indazole (5.10 g, 19.5 mmol) was dissolved in CH2Cl2 (100 mL) and cooled to 0° C. pTSA (0.18 g, 0.98 mmol) was added, followed by DHP (4.92 g, 58.6 mmol) at 0° C. and the reaction mixture was stirred at RT for 2 h. After completion of the reaction, the RM was diluted with CH2Cl2, washed with water, brine and dried (Na2SO4), filtered and concentrated under vacuum. The crude residue was purified by normal phase chromatography (eluent: 5 to 7% EtOAc in hexane) to give the title product as orange oil. 1H NMR (400 MHz, CDCl3) δ 8.01 (s, 1H), 7.69 (s, 1H), 5.99-5.69 (m, 1H), 3.96 (s, 3H) 3.45-3.43 (m, 2H), 2.53-2.51 (m, 1H), 2.17-2.10 (m, 1H), 1.94-1.93 (m, 2H), 1.79-1.73 (m, 2H).
4-Bromo-6-chloro-5-methoxy-1-(tetrahydro-2H-pyran-2-yl)-1H-indazole (3.60 g, 10.4 mmol), B2Pin2 (13.2 g, 52.2 mmol), KOAc (3.07 g, 31.3 mmol) and PdCl2dppf·CH2Cl2 (0.11 g, 0.16 mmol) were dissolved in dry 1,4-dioxane pre-degassed with nitrogen gas at RT. The reaction mixture was stirred at 120° C. for 7 h. After completion of the reaction, the RM was diluted with EtOAc, filtered through a celite pad and the filtrate was concentrated under reduce pressure. The crude residue was purified by reverse phase chromatography (eluent: 65 to 76% CH3CN in H2O containing 0.025% NH3) to give the title product as a mixture of boronate ester and boronic acid (1:1) as brown solid. 1H NMR (400 MHz, CDCl3) δ 8.51 (s, 1H), 8.15 (s, 0.5H), 8.09 (s, 0.5H), 7.97 (s, 0.5H), 7.92 (s, 0.5H), 5.86-5.81 (m, 1H), 3.87-3.72 (m, 2H), 3.72 (s, 1.5H), 3.77 (s, 1.5H), 2.03-2.00 (m, 1H), 1.94-1.91 (m, 2H), 1.72 (m, 1H), 1.57 (m, 2H), 1.41-1.37 (s, 6H).
To a solution of NiCl2·6H2O (12.2 kg, 51.0 mol) in THF (10.4 L) and MeOH (31.5 L) was added 1-bromo-5-fluoro-2-methyl-3-nitrobenzene (3.98 kg, 17.0 mol) and the mixture was cooled to 25-30° C. NaBH4 (2.00 kg, 53.0 mol) was then added portion wise over 3 h and the reaction mixture was stirred at 30° C. for 30 min then at RT for another 30 min. After completion of the reaction, the RM was poured into ice-water filtered through celite and the filtrate was extracted with EtOAc. The combined organic layers were washed with brine, dried (Na2SO4), filtered and concentrated under vacuum to give the title compound which was used without purification in the next step. 1H NMR (400 MHz, DMSO-d6) δ 6.80-6.60 (m, 1H), 6.42-6.46 (m, 1H), 5.56 (br s, 2H), 2.10 (s, 3H).
To an ice-cooled solution of 3-bromo-5-fluoro-2-methylaniline (Step 1, 3.17 kg, 15.5 mol) in DMF (32 L) was added NCS (2.67 kg, 15.5 mol) portionwise and the reaction mixture was stirred at RT for 48 h. After completion of the reaction, the RM was poured into ice cold water (100 L) and extracted with MTBE (3×20 L). The combined organic layers were washed with water then brine, dried (Na2SO4), filtered and concentrated under vacuum. The crude product was purified by normal phase chromatography (eluent: EtOAc in n-hexane 0 to 3%) to give the title compound. 1H NMR (400 MHz, DMSO-d6) δ 6.62 (d, 1H), 5.78 (br s, 2H), 2.18 (s, 3H).
A mixture of 3-bromo-4-chloro-5-fluoro-2-methylaniline (Step 2, 2.01 kg, 8.43 mol) and KOAc (836 g, 8.52 mol) in CHCl3 (20 L) was treated with Ac2O (2.51 kg, 24.6 mol) at 25-30° C. The reaction mixture was stirred at RT for 50 min. Isoamyl nitrite (1.48 kg, 12.6 mol) was added in portions over 12 h. After completion of the reaction, the RM was then refluxed at 62° C. The RM was poured into water (3.00 L) and extracted with CHCl3 (3×1.00 L). The combined organic layers were washed with sodium carbonate (aq.) then brine, dried (Na2SO4), filtered and concentrated under vacuum. To the residue in EtOH (25.0 L) was added K2CO3 (3.01 g, 21.8 mol). The reaction mixture was stirred at RT for 12 h. The solid was filtered out and the filtrate was concentrated under vacuum. The mixture was poured into water (3.00 L) and the resulting solution was extracted with EtOAc (3×5.00 L). The combined organic layers were washed with sodium carbonate (aq.) and brine, dried and concentrated under vacuum to give a crude. The crude product was purified by normal phase chromatography (eluent: EtOAc/hexane 1/30) to give the title compound. 1H NMR (400 MHz, DMSO-d6) δ 13.7 (s, 1H), 8.10 (s, 1H), 7.70-7.70 (m, 1H).
The title compound was prepared by a method similar to that of Intermediate D1 Step 6 by replacing 4-bromo-5-chloro-6-methyl-1H-indazole with 4-bromo-5-chloro-6-fluoro-1H-indazole. 1H NMR (400 MHz, DMSO-d6) δ 8.23-8.07 (m, 1H), 8.06-7.84 (m, 1H), 5.95-5.72 (m, 1H), 3.96-3.83 (m, 1H), 3.81-3.67 (m, 1H), 2.38-2.26 (m, 1H), 2.09-1.92 (m, 2H), 1.81-1.66 (m, 1H), 1.64-1.51 (m, 2H).
To a well stirred solution of 4-bromo-5-chloro-6-fluoro-1-(tetrahydro-2H-pyran-2-yl)-1H-indazole (Step 4, 800 g, 2.40 mol) in THF (12.0 L) was added dropwise at −70° C./−78° C. n-BuLi (1.71 L, 4.28 mol). The reaction mixture was stirred at −78° C. for 1 h then 2-isopropoxy-4,4,5,5-tetramethyl-1,3,2-dioxaborolane (1.97 kg, 10.6 mol) was added dropwise at −78° C. with stirring. After the addition, the reaction mixture was stirred at −70° C./−60° C. for 1 h. The RM was quenched with 10% aq. citric acid solution (12.0 L) and extracted with EtOAc (2×5.00 L). The combined organic layers were washed with water then brine, dried and concentrated under vacuum. The crude product was recrystallized at −10° C./−20° C. with heptane. The solid was filtered and washed with heptane to give the title compound. 1H NMR (400 MHz, CDCl3) δ 8.24 (s, 1H), 7.48 (d, 1H), 5.70-5.65 (m, 1H), 4.02-3.95 (m, 1H), 3.76-3.72 (m, 1H), 2.52-2.47 (m, 1H), 2.17-2.08 (m, 2H), 1.77-1.69 (m, 3H), 1.43 (s, 12H).
To a solution of 1-chloro-5-fluoro-2-methyl-4-nitrobenzene (100 g, 527 mmol) in Ethanol:Water (1:1) (950 mL) was added dropwise HCl (12M, 41.8 mL, 527 mmol) at RT. The mixture was heated to 80° C. and Fe powder (83.9 g, 1.58 mol) was added slowly over a period of 30 min. The reaction mixture was stirred at 80° C. for 1 h. Then was cooled to RT, diluted with EtOAc and basified to pH=8-9 by addition of a sat. aq. NaHCO3 solution. The layers were filtered over a pad of celite and the aqueous layer was extracted with EtOAc. The combined organic extracts were washed with brine, dried (Na2SO4) and concentrated under vacuum to give the title compound which was directly used in the next step without further purification. 1H NMR (400 MHz, DMSO-d6) δ 7.10 (d, 1H), 6.70 (d, 1H), 5.20 (s, 2H), 2.16 (s, 3H).
4-Chloro-2-fluoro-5-methylaniline (Step 1, 78.0 g, 489 mmol) was dissolved in DMF (830 mL) and cooled to 0° C. NBS (36.2 g, 532 mmol) was added portion wise and the reaction mixture was stirred at RT for 1 h. The reaction mixture was poured into ice/water and extracted with EtOAc. The combined organic extracts were washed with brine, dried (Na2SO4), filtered concentrated under vacuum and the crude residue was purified by normal phase chromatography (eluent: EtOAc in hexane 0-2%) to give the title compound. 1H NMR (400 MHz, DMSO-d6) δ 7.32 (d, 1H), 5.46 (s, 2H), 2.37 (s, 3H).
To a solution of concentrated H2SO4 (200 mL) in water (700 mL) was added 2-bromo-4-chloro-6-fluoro-3-methylaniline (Step 2, 86.0 g, 356 mmol). The mixture was stirred at 25° C. for 10 min then cooled to 0° C. and NaNO2 (26.4 g, 389 mmol) in water (100 mL) was added dropwise. The reaction mixture was stirred at 0-5° C. for 30 min. A solution of KI (231 g, 1.39 mol) in water (300 mL) was added dropwise to the reaction mixture which was stirred at 0° C. for another 20 min then allowed to reach RT and further stirred for 18 h. The RM was pourred into ice/water and extracted with EtOAc. The combined organic extracts were washed with a sat. aq. Na2S2O3 solution, with a sat. aq. NaHCO3 solution, brine, dried (Na2SO4), filtered and concentrated under vacuum. The crude residue was purified by normal phase chromatography (eluent: 100% hexane) to give the title compound as yellow solid. 1H NMR (400 MHz, CDCl3) δ 7.21 (d, 1H), 2.69 (s, 3H).
To a solution of 3-bromo-1-chloro-5-fluoro-4-iodo-2-methylbenzene (Step 3, 71.0 g, 206 mmol) in THF (710 mL) was added dropwise n-BuLi (23% in hexane, 84.8 mL, 305 mmol) at −78° C. over a period of 30 min and the mixture was stirred at −78° C. for another 30 min. Anhydrous DMF (22.3 g, 305 mmol) was added dropwise at −78° C. and the reaction mixture was stirred for 30 min. After completion of the reaction, the RM was quenched with HCl (1N, 55 mL). Water was added and the mixture was extracted with EtOAc. The combined organic extracts were washed with brine, dried (Na2SO4), filtered and concentrated under vacuum to give the title compound as an orange oil which was directly used in the next step without further purification. 1H NMR (400 MHz, MeOD) δ 10.29 (s, 1H), 7.48 (d, 1H), 2.50 (s, 3H).
2-Bromo-4-chloro-6-fluoro-3-methylbenzaldehyde (50.0 g, 199 mmol) was dissolved in DMSO (500 mL) and cooled to 0° C. NH2NH2·H2O (119 g, 2.38 mmol) was added dropwise over a period of 30 min and the reaction mixture was stirred at 90° C. for 12 h. After completion of the reaction, the RM was diluted with water and extracted with EtOAc. The combined organic extracts were washed with brine, dried (Na2SO4), filtered, concentrated under reduced pressure and the crude residue was purified by trituration in n-pentane to give the title compound. 1H NMR (400 MHz, CDCl3) δ 8.07 (s, 1H), 7.56 (s, 1H), 2.63 (s, 3H). UPLC-MS-5: Rt=1.88 min; MS m/z [M+H]+ 245.2/247.2.
To a solution of 4-bromo-6-chloro-5-methyl-1H-indazole (Step 5, 31.0 g, 126 mmol) in CH2Cl2 cooled to 0° C. was slowly added pTSA (2.40 g, 12.6 mmol) followed by dropwise addition of DHP (31.8 g, 378 mmol) and the reaction mixture was stirred at RT for 3 h. After completion of the reaction, the RM was diluted with water and extracted with EtOAc. The combined organic extracts were washed with brine, dried (Na2SO4), filtered, concentrated under vacuum and the crude residue was purified by normal phase chromatography (eluent: 3-5% EtOAc in hexane) to give the title compound. 1H NMR (400 MHz, CDCl3) δ 7.98 (s, 1H), 7.67 (s, 1H), 5.68 (m, 1H), 4.05 (m, 1H), 3.89 (m, 1H), 2.62 (s, 3H), 2.53 (m, 1H), 2.17-2.09 (m, 2H), 1.93 (m, 1H), 1.70 (m, 2H). UPLC-MS-5: Rt=2.33 min, MS m/z [M-THP]+244/246.
6-Chloro-5-methyl-1-(tetrahydro-2H-pyran-2-yl)-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-indazole (Step 5, 38.0 g, 115 mmol), B2Pin2 (32.2 g, 126 mmol) and KOAc (35.9 g, 367 mmol) were added in 1,4-dioxane (320 mL) and the reaction mixture was degassed with N2 for 10 min. PdCl2dppf (4.21 g, 5.76 mmol) was added and the RM was stirred at 100° C. for 20 h in a sealed flask. The RM was cooled to RT, diluted with EtOAc and filtered through celite. The filtrate was concentrated under vacuum and the crude residue was purified by normal phase chromatography (eluent: 3-5% EtOAc in hexane) followed by trituration in n-pentane to give the title compound as a white solid. 1H NMR (400 MHz, DMSO-d6) δ 8.18 (s, 1H), 8.01 (s, 1H), 5.84 (m, 1H), 3.90-3.82 (m, 1H), 3.79-3.71 (m, 1H), 2.59 (s, 3H), 2.41-2.31 (m, 1H), 2.06-1.98 (m, 1H), 1.96-1.89 (m, 1H), 1.77-1.67 (m, 1H), 1.61-1.53 (m, 2H), 1.37 (s, 12H). UPLC-MS-5: Rt=2.54 min, MS m/z [M+H]+ 377.4/379.4.
To a solution of fuming nitric acid (3.64 mL, 81 mmol) in acetic anhydride (100 mL) was added at 0° C. 4-bromo-5-chloro-6-methyl-1H-indazole (Intermediate D2, 5.00 g, 20.4 mmol) and the reaction mixture was stirred at 0° C. for 30 min. The RM was poured into a mix of ice/water and the precipitate was filtered off, washed with water and dried under reduced pressure to give the title compound. 1H NMR (400 MHz, DMSO-d6) δ 9.35 (s, 1H), 7.78 (s, 1H); UPLC-MS-3: Rt=1.36 min; MS m/z [M−H]− 288.0/290.0.
A solution of 4-bromo-5-chloro-6-methyl-2-nitro-2H-indazole (Step 1, 5.55 g, 17.4 mmol) in toluene (100 mL) was warmed to 110° C. and stirred for 1 h. The reaction mixture was cooled to RT and the solid was filtered off, washed with toluene and dried under reduced pressure to give the title compound. 1H NMR (400 MHz, DMSO-d6) δ 14.6 (br s, 1H), 7.79 (s, 1H), 2.57 (s, 3H); UPLC-MS-3: Rt=1.13 min; MS m/z [M−H]− 288.0/290.0.
To a suspension of 4-bromo-5-chloro-6-methyl-3-nitro-1H-indazole (Step 2, 4.19 g, 14.3 mmol) in EtOH (160 mL) and hydrochloric acid (10.5N, 27.1 mL, 286 mmol) was added tin(II) chloride (13.5 g, 71.4 mmol) and the reaction mixture was stirred at RT for 2 h. The RM was concentrated under reduced pressure, the white residue was diluted with CH2Cl2 (150 mL) and water (200 mL), cooled to 0° C. and basified with solid NaOH until pH 9. The cloudy mixture was extracted with CH2Cl2 (3×500 mL), the organic phase dried (phase separator) and concentrated under reduced pressure to give the title compound as a light pink cotton. 1H NMR (400 MHz, DMSO-d6) δ 11.9 (s, 1H), 7.26 (s, 1H), 5.19 (s, 2H), 2.44 (s, 3H); UPLC-MS-3: Rt=0.88 min; MS m/z [M+H]+ 260.1/262.0.
To a suspension of 4-bromo-5-chloro-6-methyl-1H-indazol-3-amine (Step 3, 3.25 g, 12.5 mmol), triethylamine (3.48 mL, 24.95 mmol) and DMAP (0.38 g, 3.12 mmol) in CH2Cl2 (70 mL) was added Boc-anhydride (3.13 g, 14.4 mmol) and the reaction mixture was stirred at RT for 2 h. A precipitate formed, the RM was filtered to give tert-butyl 3-amino-4-bromo-5-chloro-6-methyl-1H-indazole-1-carboxylate as the major product: 1H NMR (400 MHz, DMSO-d6) δ 8.03 (s, 1H), 6.10 (s, 2H), 2.52 (s, 3H), 1.59 (s, 9H); UPLC-MS-3: Rt=1.30 min; MS m/z [M+H]+ 360.0/362.0. The filtrate was concentrated under reduced pressure, the residue dissolved in EtOAc, washed with a sat. aq. NaHCO3 solution and brine. The organic phase was dried (phase separator), concentrated under reduced pressure and the crude residue was purified by normal phase chromatography (eluent: c-hexane/EtOAc 100/0 to 70/30) to give tert-butyl 3-amino-4-bromo-5-chloro-6-methyl-2H-indazole-2-carboxylate: 1H NMR (400 MHz, DMSO-d6) δ 7.21 (s, 1H), 7.03 (s, 2H), 2.36 (s, 3H), 1.60 (s, 9H); UPLC-MS-3: Rt=1.31 min; MS m/z [M+H]+ 360.1/362.1.
In a sealed tube, a solution of tert-butyl 3-amino-4-bromo-5-chloro-6-methyl-1H-indazole-1-carboxylate (Step 4, 1.00 g, 2.77 mmol), bis(pinacolato)diboron (2.82 g, 11.1 mmol), PdCl2(dppf) (0.20 g, 0.28 mmol) and potassium acetate (0.68 g, 6.93 mmol) in 1,4-dioxane (24 mL) was stirred at 80° C. for 16 h. Bis(pinacolato)diboron (2.82 g, 11.1 mmol) and PdCl2(dppf) (0.20 g, 0.28 mmol) were added and the reaction mixture was stirred for an additional 13.5 h. The RM was filtered, the filtrate concentrated under reduced pressure and the crude residue purified by normal phase chromatography (eluent: c-hexane/EtOAc 100/0 to 40/60) to give the title compound. 1H NMR (400 MHz, DMSO-d6) δ 7.92 (s, 2H), 6.35 (s, 1H), 2.45 (s, 3H), 1.59 (s, 9H), 1.40 (s, 12H); UPLC-MS-3: Rt=1.43 min; MS m/z [M+H]+ 408.3/410.3.
To a stirred solution of 4-bromo-5-chloro-6-methyl-1H-indazole (Intermediate D2, 20.0 g, 81.0 mmol) in MeOH (250 mL) was added NaOH (4 N, 132 mL, 530 mmol) and iodine (24.8 g, 98.0 mmol) at 0° C. and the reaction mixture was stirred at RT for 16 h. The RM was cooled down to 0° C. and acidified with HCl (4N), then Na2S2O3 (10% solution) was added until a yellow suspension formed. EtOAc was added, the layers were separated (repeated twice) and the combined organic extracts were dried (Na2SO4), filtered and evaporated. The crude residue was purified by normal phase chromatography (eluent: EtOAc in c-hexane from 0 to 50%) to give the title compound as a yellow solid. UPLC-MS-4: Rt=1.23 min; MS m/z [M+H]+ 368.9/370.9/372.9.
To a suspension of 4-bromo-5-chloro-3-iodo-6-methyl-1H-indazole (Step 1, 23.7 g, 63.7 mmol) in CH2Cl2 (300 mL) was added under Ar p-toluenesulfonic acid monohydrate (0.61 g, 3.19 mmol) and dihydropyran (11.6 mL, 127 mmol) and the reaction mixture was stirred for RT for 2 h. The RM was quenched by addition of a sat. aq. NaHCO3 solution, extracted with CH2Cl2 (×2) and the combined organic extracts were washed with a sat. aq. NaHCO3 solution, dried (Na2SO4), filtered and evaporated. The crude residue was triturated in Et2O and the precipitate was filtrated to give the title as a yellow solid. UPLC-MS-4: Rt=1.57 min; MS m/z [M+H]+ 455.1/457.1/459.1.
To a stirred solution of 4-bromo-5-chloro-3-iodo-6-methyl-1-(tetrahydro-2H-pyran-2-yl)-1H-indazole (Step 2, 12.4 g, 27.3 mmol) and PdCl2(dppf). CH2Cl2 adduct (1.11 g, 1.36 mmol) in DMF (100 mL) was added under Ar Me2Zn (2 M in toluene, 15.7 mL, 31.4 mmol) and the reaction mixture was stirred at 80° C. for 16 h. The RM was quenched with a sat. aq. NaHCO3 solution, extracted with EtOAc (×2) and the combined organic extracts were washed with a sat. aq. NaHCO3 solution, dried (Na2SO4), filtered and evaporated. The crude residue was purified by normal phase chromatography (eluent: EtOAc in c-hexane from 0 to 9%) to give the title compound as a yellow solid. UPLC-MS-4: Rt=1.48 min; MS m/z [M+H]+ 343.1/345.1/347.1.
A solution of 4-bromo-5-chloro-3,6-dimethyl-1-(tetrahydro-2H-pyran-2-yl)-1H-indazole (Step 3, 3.60 g, 10.5 mmol), bis(pinacolato)diboron (3.99 g, 15.7 mmol) and KOAc (3.08 g, 31.4 mmol) in DMSO (40 mL) was deoxygenated and refilled with argon (×3), then heated to 100° C. and PdCl2(dppf). CH2Cl2 adduct (0.85 g, 1.05 mmol) was added. The reaction mixture was deoxygenated again (×3) and stirred for 16 h at 100° C. The RM was quenched with a sat. aq. NaHCO3 solution, extracted with EtOAc (×2) and the combined organic extracts were washed with a sat. aq. NaHCO3 solution, dried (Na2SO4), filtered and evaporated. The crude residue was purified by normal phase chromatography (eluent: EtOAc in c-hexane from 0 to 30%) to give the title compound as a white solid. UPLC-MS-4: Rt=1.38 min; MS m/z [M+H]+ 391.3/393.3.
In an Ace-tube, to a solution of 2,5-dichloropyrimidine (1.01 g, 6.78 mmol) in EtOH (7.5 mL) was added hydrazine monohydrate (0.66 mL, 13.6 mmol) and the resulting thick white suspension was vigorously stirred at 60° C. for 5.5 h. The precipitate was filtered-off, washed with EtOH and dried under HV. The white powder was taken up in EtOAc and a sat. aq. NaHCO3 solution was added. The precipitate was filtered-off to give a first batch of the title compound. The 2 layers in the filtrate were separated and the aqueous layer was back extracted with EtOAc (×2). The combined organic extracts were dried (phase separator) and concentrated in vacuo to give a second batch of the title compound as a white solid. UPLC-MS-4: Rt=0.37 min; MS m/z [M+H]+ 145.0/147.0.
In a microwave vial containing dry 3A° molecular sieves (810 mg) were added 5-chloro-2-hydrazineylpyrimidine (Step 1, 575 mg, 3.98 mmol), 3-iodoprop-2-ynal (CAS [20328-44-3], 753 mg, 3.98 mmol) and dry THF (15 mL) under argon. The vial was sealed and stirred at RT for 20 min. The reaction mixture was evaporated in vacuum to give the title compound as a mixture of cis/trans isomer as a brown solid which was used without further purification in the next step. UPLC-MS-4: Rt=0.67 and 0.80 min; MS m/z [M+H]+ 307.0/309.0.
The title compound was prepared following procedures described in Le Fouler, V.; Chen, Y.; Gandon, V.; Bizet, V.; Salomé, C.; Fessard, T.; Liu, F.; Houk, K. N.; Blanchard, N. J. Am. Chem. Soc, 2019, 141, 15901. In a microwave vial under argon atmosphere, to a solution of 5-chloro-2-(2-(3-iodoprop-2-yn-1-ylidene)hydrazineyl)pyrimidine (Step 2, 1.26 g, 3.99 mmol) in dry THF (17 mL) were added 3-pentanone (1.27 mL, 12.0 mmol) and TFAA (0.84 mL, 5.98 mmol) dropwise. The vial was sealed and placed under microwave irradiations at 80° C. for 2 h. The reaction mixture was poured into an aq. sat. NaHCO3 solution and extracted with EtOAc (×2). The combined organic extracts were dried (phase separator), concentrated in vacuo and the crude residue was purified by normal phase chromatography (eluent: MeOH in CH2Cl2 0 to 3%) to give the title compound. UPLC-MS-4: Rt=1.23 min; MS m/z [M+H]+ 280.0/282.0.
To an ice-cooled suspension of 5-chloro-4-iodo-1H-pyrazolo[3,4-b]pyridine (Step 3, 690 mg, 2.35 mmol) in CH2Cl2 (5.50 mL) were added p-toluenesulfonic acid monohydrate (446 mg, 2.35 mmol) followed by 3,4-dihydro-2H-pyran (0.43 mL, 4.69 mmol). The reaction mixture was allowed to reach RT and stirred at RT for 23 h. p-Toluenesulfonic acid monohydrate (223 mg, 1.17 mmol) and 3,4-dihydro-2H-pyran (0.21 mL, 2.34 mmol) were added again and the reaction mixture was further stirred at RT for 16 h. The RM was poured into a sat. aq. solution of NaHCO3 and extracted with CH2Cl2 (×3). The combined organic extracts were dried (phase separator), concentrated and the crude residue was purified by normal phase chromatography (eluent: EtOAc in n-heptane 0 to 40%) to give the title compound as a beige solid. UPLC-MS-4: Rt=1.23 min; MS m/z [M+H]+ 364.1/366.1.
A microwave vial was charged with 5-chloro-4-iodo-1-(tetrahydro-2H-pyran-2-yl)-1H-pyrazolo[3,4-b]pyridine (Step 4, 512 mg, 1.31 mmol), bis(pinacolato)diboron (665 mg, 2.62 mmol), PdCl2(dppf)·CH2Cl2 adduct (107 mg, 0.13 mmol) and KOAc (386 mg, 3.93 mmol). 1,4-Dioxane (6.50 mL) was added and the mixture was degassed by sparging with argon and stirred at 120° C. (pre-heated oil bath) for 18 h. The reaction mixture was filtered through a pad of celite and washed with EtOAc. The filtrate was concentrated under reduced and the crude residue was purified by normal phase chromatography (eluent: MeOH in CH2Cl2 0 to 5%) to give the title compound as a yellow oil. UPLC-MS-4: Rt=0.66 min; MS m/z [M−H]− 280.2/282.2.
A mixture of 4-bromonaphtalen-2-ol (1.00 g, 4.48 mmol), bis(pinacolato)diboron (1.88 g, 7.40 mmol), KOAc (1.32 g, 13.45 mmol) and PdCl2(dppf). CH2Cl2 adduct (0.37 g, 0.45 mmol) in dry dioxane (40 mL) under nitrogen was stirred at 90° C. for 2 h. The reaction mixture was diluted with EtOAc, filtered through a pad of celite and washed with EtOAc. The filtrate was concentrated and purified by normal phase chromatography (eluent: EtOAc in c-hexane from 0 to 50%) to give the title product as a beige solid. UPLC-MS-2a: Rt=1.16 min; MS m/z [M+H]+ 271.2.
To a suspension of 1-chloro-2-5-dimethyl-4-nitrobenzene (24.9 g, 134 mmol) in TFA (75 mL) and conc. H2SO4 (25 mL) at 0° C. was added NBS (23.8 g, 134 mmol) portion wise under nitrogen atmosphere. The resulting solution was stirred at 40° C. for 5 h. After completion of the reaction, the RM was quenched with ice cold water and extracted with EtOAc. The combined organic extracts were washed with a sat. aq. NaHCO3 solution, brine, dried (Na2SO4), filtered and concentrated under reduced pressure to give the title compound. 1H NMR (400 MHz, CDCl3) δ 7.66 (s, 1H), 2.57 (s, 3H), 2.34 (s, 3H).
To a solution of 3-bromo-2-chloro-1,4-dimethyl-5-nitrobenzene (33.0 g, 130 mmol) and Sn (46 g, 390 mmol) in THF (350 mL) cooled to 0° C. was added drop wise HCl (4M in water, 259 mL, 779.5 mmol) and the reaction mixture was stirred for 1 h at RT. After completion of the reaction, the RM was filtered through a celite pad and the filtrate was extracted with EtOAc. The combined organic extracts were washed with a sat. aq. NaHCO3 solution, brine, dried (Na2SO4), filtered and concentrated under reduced pressure. The crude residue was purified by normal phase chromatography (eluent: 12-16% EtOAc in hexane) to give the title compound as pale brown solid flakes. 1H NMR (400 MHz, DMSO-d6) δ 6.60 (s, 1H), 5.24 (s, 2H), 2.27 (s, 3H), 2.23 (s, 3H).
To a solution of 3-bromo-4-chloro-2,5-dimethylaniline (10 g, 435 mmol) in THF (50 mL) at 0° C. was added drop wise HCl (6.0 N in water, 100 mL) and the mixture was stirred for 10 min. NaNO2 (3.53 g, 522 mmol) in solution in a minimum amount of water was added drop wise into the above reaction mixture at 0° C., while maintaining the temperature at 0° C. and the mixture was stirred for 15 min and then 30 min at RT. This RM was added into another flask containing water (300 mL) and CPME (342 mL) with continuous stirring at RT and the reaction mixture was refluxed (100° C.) for 20 min. After completion of the reaction, the RM was allowed to cool to RT, was quenched with cold water and extracted by EtOAc. The combined organic extracts were washed with brine, dried (Na2SO4), filtered and concentrated under reduced pressure. The crude residue was purified by normal phase chormatography on neutral alumina oxide (eluent: 1.5-3.5% EtOAc in Hexane) to give the title compound as a light brown solid. 1H NMR (400 MHz, DMSO-d6) δ 9.95 (s, 1H), 6.80 (s, 1H), 2.33 (s, 3H), 2.29 (s, 3H).
3-Bromo-4-chloro-2,5-dimethylphenol (5.00 g, 21.5 mmol) was dissolved in DMF (50 mL). K2CO3 (8.88 g, 64.437 mmol) was added at 0° C. followed MOM-Cl (3.46 g, 42.9 mmol) drop wise under N2 atmosphere and the reaction mixture was stirred at RT for 3 h. After completion of the reaction, the RM was quenched with water and extracted by EtOAc. The combined organic layers were washed with a sat. aq. NaHCO3 solution, brine, dried (Na2SO4), filtered and concentrated under reduced pressure. The crude residue was purified normal phase chromatography on neutral alumina oxide (eluent: 1-1.8% EtOAc in Hexane) to give the title compound as a brown oil. 1H NMR (400 MHz, CDCl3) δ 6.97 (s, 1H), 5.19 (s, 2H), 3.51 (s, 3H), 2.42 (s, 3H), 2.34 (s, 3H).
3-Bromo-2-chloro-5-(methoxymethoxy)-1,4-dimethylbenzene (2.04 g, 7.34 mmol), B2Pin2 (3.72 g, 14.7 mmol), KOAc (2.15 g, 22.0 mmol) and PdCl2dppf (0.267 g, 0.37 mmol) were added to pre-degassed 1,4-dioxane (40 mL) at RT. The reaction mixture was stirred at 120° C. for 2 h in a sealed tube. After completion of the reaction, the reaction mixture was diluted with EtOAc, filtered through a celite pad and the filtrate was concentrated under reduce pressure. The crude residue was purified by normal phase chromatography (100% Hexane) to give the title compound as a pale yellow oil. 1H NMR (400 MHz, CDCl3) δ 6.97-6.93 (m, 1H), 5.15 (s, 2H), 3.50 (s, 3H), 2.38 (s, 3H), 2.30 (s, 3H), 1.44 (s, 12H).
To a solution of 4-bromo-5-chloro-6-methyl-1H-indazole (Intermediate D2, 2.00 g, 8.15 mmol) in DMF (27.2 mL) at 0° C. were added Cs2CO3 (5.31 g, 16.3 mmol) and MeI (0.51 mL, 8.15 mmol). The reaction mixture was stirred and warm to RT for 2 h. More MeI (0.051 mL, 0.815 mmol) was added to the reaction mixture to complete the reaction. The reaction mixture was quenched by addition of water and extracted with EtOAc (×2). The organic phase was washed with brine, dried (MgSO4), filtered and concentrated in vacuo. The crude residue was purified by normal phase chromatography (eluent: EtOAc in heptane 0 to 70%) to give the title compound as the first eluting regiosiomer. UPLC-MS-4: Rt=1.25 min; MS m/z [M+H]+ 259.0/261.0.
To a solution of 4-bromo-5-chloro-1,6-dimethyl-1H-indazole (step 1, 1.27 g, 4.89 mmol) in 1,4-dioxane (12.2 mL) were added B2Pin2 (2.48 g, 9.79 mmol), PdCl2(dppf)·CH2Cl2 adduct (0.40 g, 0.49 mmol) and KOAc (1.44 g, 14.7 mmol). The reaction mixture was stirred at 110° C. for 5 h. The RM was quenched by addition of water. The solution was then extracted with CH2Cl2. The organic phase was washed with brine, dried (MgSO4), filtered and concentrated in vacuo. The crude residue was purified by normal phase chromatography (eluent: EtOAc in heptane 0 to 10%) to give the title compound. UPLC-MS-4: Rt=1.26 min; MS m/z [M+H]+ 307.2/309.3.
Fuming nitric acid (50% in TFA, 4.50 mL, 50.4 mmol) was slowly added to a solution of Intermediate D6, 5.00 g, 12.6 mmol) in HOAc (25 mL) at RT. Subsequently, acetic anhydride (2.40 mL, 25.6 mmol) was slowly added via a dropping funnel and the exothermic mixture was maintained at 60° C. After cooling slightly, the resulting suspension was quenched with ice-H2O, sonicated and filtered to provide the title compound as a pale yellow solid. 1H NMR (600 MHz, DMSO-d6) δ 14.8 (br s, 1H), 8.19 (s, 1H), 1.42 (s, 12H); UPLC-MS-2e: Rt=5.95 min; MS m/z [M−H]− 356.1/358.2/360.1.
A mixture of 5,6-dichloro-3-nitro-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-indazole (Step 1, 3.67 g, 9.30 mmol), Zn powder (6.10 g, 93.0 mmol) in HOAc (50 mL) was stirred at RT for 30 min. After filtering and washing the precipitate with EtOAc, the filtrate was concentrated under reduced pressure. The residue was diluted with a sat. aq. NaHCO3 solution and extracted with EtOAc (2×). The combined organic layers were washed with brine, dried (phase separator) and concentrated under reduced pressure. The crude residue was purified by normal phase chromatography (eluent: MeOH in CH2Cl2 from 0 to 10% in 50 min) to provide the title compound. 1H NMR (400 MHz, DMSO-d6) δ 11.9 (br s, 1H), 7.62 (s, 1H), 4.99 (br s, 2H), 1.39 (s, 12H); UPLC-MS-4: Rt=0.45 min; MS m/z [M+H]+ 246.1/248.1/250.1 (hydrolysis to boronic acid under UPLC conditions).
DMAP (0.26 g, 2.14 mmol) was added to a solution of 5,6-dichloro-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-indazol-3-amine (Step 2, 3.19 g, 8.56 mmol), Et3N (2.39 mL, 17.12 mmol) and Boc-anhydride (1.96 g, 8.99 mmol) in CH2Cl2 (40 mL). After stirring overnight, the reaction mixture was diluted with CH2Cl2, washed with a sat. aq. NaHCO3 solution, dried (phase separator) and concentrated under reduced pressure. The crude residue was purified by normal phase chromatography (eluent: MeOH in CH2Cl2 from 0 to 10% in 30 min) to provide the title compound. 1H NMR (400 MHz, DMSO-d6) δ 8.25 (s, 1H), 5.86 (s, 2H), 1.59 (s, 9H), 1.40 (s, 12H); UPLC-MS-4: Rt=1.02 min; MS m/z [M+H]− 344.0/345.9/348.0 (hydrolysis to boronic acid under UPLC conditions).
To an ice-cooled solution of 4-bromo-5-methyl-1H-indazole (5.00 g, 23.7 mmol) in THF (50 mL) under inert atmosphere was added NaH (1.90 g, 47.4 mmol), followed by toluene-4-sulfonyl chloride (4.97 g, 26.1 mmol) and the reaction mixture was stirred at RT for 1 h. The RM was quenched carefully at 0° C. with water and extracted with CH2Cl2. The organic phase was dried (Na2SO4), filtered and evaporated. The crude residue was triturated with Et2O and the white precipitate was filtered, washed with cold Et2O and dried under high vacuum to give the title compound as a white solid. UPLC-MS-1a: Rt=1.34 min; MS m/z [M+H]+ 365/367.
To a solution of 4-bromo-5-methyl-1-tosyl-1H-indazole (step 1, 7.94 g, 21.7 mmol) in 1,4-dioxane (80 mL) under inert atmosphere were added B2Pin2 (11.0 g, 43.5 mmol), PdCl2(dppf)·CH2Cl2 adduct (0.89 g, 1.09 mmol) and KOAc (6.40 g, 65.2 mmol). The reaction mixture was degassed then stirred at 100° C. for 16 h. The RM was quenched with water and extracted with CH2Cl2. The organic phase was washed with brine, then dried (Na2SO4, filtered and evaporated. The crude residue was triturated with Et2O, the white precipitate was filtered, washed with cold Et2O and dried under high vacuum. The crude product was purified by normal phase chromatography (eluent: EtOAc in c-hexane from 0 to 40%) to give the title compound. UPLC-MS-1a: Rt=1.48 min; MS m/z [M+H]+ 413.
The activity of a compound according to the present invention can be assessed by the following in vitro methods.
Human KRASG12C (UniProtKB: P01116) amino acids M1-K169 were expressed from plasmid pCZ239 (SEQ ID NO: 1) in E. coli BL21 (DE3) in the presence of a plasmid encoding biotin-[acetyl-CoA-carboxylase] ligase BirA (NCBI Reference Sequence: NP_418404.1, aa 1-321, full length) in Luria-Bertani (LB) medium-supplemented with 25 μg/ml kanamycin, 34 μg/ml chloramphenicol, 135 □M biotin and 1 mM isopropyl β-D-1-thiogalactopyranoside overnight at 18° C. Cells were harvested by centrifugation and frozen at −80° C. until further processing. Cells were thawed and resuspended in Buffer A (20 mM Tris-HCl pH8, 500 mM NaCl, 5 mM imidazole, 2 mM TCEP, 10% glycerol) supplemented with 1 tablet protease inhibitor/50 ml buffer (Complete EDTA free, Roche) and 15 μl Turbonuclease (90% purity, 50KUN, ≥200,000 units/mL, Sigma) and incubated for 20 min at 4° C. The cells were lysed by 4 passages through an Avestin Emulsiflex at about 20000 psi and insoluble debris removed by centrifugation and filtered through a 0.45 □m Durapore membrane (Millipore). Immobilized metal affinity chromatography was performed with a HisTrap HP 5 mL column (GE) with Buffer A and eluted with a linear gradient over 10 column volumes of Buffer A substituted with 200 mM imidazole. Eluted protein fractions were analyzed by Novex NuPage 4-12% PAGE. The affinity tag was removed by HRV3C protease cleavage (HRV3C protease produced in-house but also available commercially) during dialysis against Buffer A for 18 h at 4° C. and capturing by a reverse IMAC purification on a HisTrap HP 5 mL column. The protein in the flow through was subjected to a final polishing step on a HiLoad 16/60 Superdex 200 prep grade size-exclusion column pre-equilibrated with SEC-buffer (20 mM HEPES pH 7.4, 150 mM NaCl, 5 mM MgCl2, 1 □M GDP). Positive fractions were determined by PAGE (Novex NuPage 4-12% BisTris) analysis. The correct mass was determined by RP (Reverse Phase) LC-MS, and indicated complete biotinylation of the protein.
TGAAAACACATCATCATCATCATCATGGTGGCGGCAGTGGCGGTG
GCTCAGGCGGTGGTTCTCTCGAGGTTCTGTTCCAGGGTCCGGGTT
TGAACGACATCTTCGAAGCTCAGAAGATCGAATGGCACGAGGGTG
GCGGTAGTGGTGGTGGCTCTATGACTGAATACAAGCTGGTTGTTG
TTGGTGCTTGTGGCGTTGGTAAGAGCGCACTGACCATCCAGCTCA
TTCAGAATCACTTCGTGGACGAGTACGACCCGACCATCGAAGATT
CTTACCGTAAACAGGTGGTTATTGATGGCGAAACCTGTCTGCTGG
ATATTCTGGACACTGCTGGTCAGGAAGAGTACTCCGCTATGCGTG
ATCAGTACATGCGTACTGGTGAAGGTTTCCTCTGCGTGTTCGCTA
TCAACAACACCAAGTCCTTCGAAGATATCCACCATTACCGTGAAC
AGATCAAACGTGTGAAGGACAGCGAAGACGTGCCAATGGTTCTGG
TGGGCAACAAATGTGATCTCCCGAGCCGTACCGTTGACACCAAAC
AGGCACAAGACCTGGCACGTTCCTACGGCATCCCATTCATTGAAA
CTAGCGCGAAGACTCGTCAGGGTGTGGACGACGCATTCTACACTC
TGGTGCGTGAAATTCGCAAGCACAAAGAGAAATAATGGTACCGAA
To a solution of 2-methyl-1H-pyrrolo[2,3-b]pyridine (1.63 g, 12.3 mmol) in acetonitrile (50 mL) was added NBS (2.19 g, 12.3 mmol) at RT. The reaction mixture was stirred at RT for 1 h. The reaction was quenched by addition of a 10% solution of sodium thiosulfate (10 mL). The solution was then extracted with EtOAc (20 mL). The organic phase was washed with water (3×), brine, then dried (MgSO4), filtered and evaporated. UPLC-MS-1: Rt=0.88 min; MS m/z [M+H]+ 211/213.
To a solution of 3-bromo-2-methyl-1H-pyrrolo[2,3-b]pyridine (Step 1, 2.4 g, 11.4 mmol) in dry DMSO (20 mL) was added under inert atmosphere potassium tert-butoxide (1.40 g, 12.5 mmol) and 1,2-difluoro-4-nitrobenzene (1.81 g, 11.4 mmol). The reaction mixture was stirred at 80° C. for 2 h. The reaction was quenched by addition of water. The solution was then extracted with EtOAc (3×). The organic phase was washed with brine, then dried (MgSO4), filtered and evaporated. The crude product was purified by normal phase chromatography (eluent: EtOAc in Heptane 0 to 30%) to give the title compound. UPLC-MS-1: Rt=1.24 min; MS m/z [M+H]+ 350.0/352.1.
To a solution of 3-bromo-1-(2-fluoro-4-nitrophenyl)-2-methyl-1H-pyrrolo[2,3-b]pyridine (Step 2, 1.00 g, 2.86 mmol) in 1,4-dioxane (10 mL)/water (2.8 mL) was added under inert atmosphere 5-methyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1-tosyl-1H-indazole (Intermediate D18) (1.41 g, 3.43 mmol) followed by K3PO4 (1.21 g, 5.71 mmol) and then Pd-XPhos-G3 (0.24 g, 0.29 mmol). The reaction mixture was stirred 3 h at 80° C. The RM was quenched by addition of saturated solution of NaHCO3. The solution was then extracted with EtOAc. The organic phase was washed with brine, then dried (MgSO4), filtered and evaporated. The crude product was purified by normal phase chromatography (eluent: EtOAc in n-heptane 0 to 50%) to give the title compound. UPLC-MS-1: Rt=1.38 min; MS m/z [M+H]+ 556.2.
To a stirred solution of 4-(1-(2-fluoro-4-nitrophenyl)-2-methyl-1H-pyrrolo[2,3-b]pyridin-3-yl)-5-methyl-1-tosyl-1H-indazole (Step 3, 1.34 g, 2.41 mmol) in 1,4-dioxane (12 mL) was added NaOH (6.03 mL, 12.1 mmol) at RT. The reaction mixture was stirred at 60° C. for 3 h. The RM was quenched by addition of water. The solution was then extracted with EtOAc. The organic phase was washed with brine, dried over MgSO4, filtered and evaporated. The crude product was purified by normal phase chromatography (eluent: EtOAc in Heptane 0 to 100%) to give the title compound. UPLC-MS-1: Rt=1.11 min; MS m/z [M+H]+ 402.2.
To a solution of 4-(1-(2-fluoro-4-nitrophenyl)-2-methyl-1H-pyrrolo[2,3-b]pyridin-3-yl)-5-methyl-1H-indazole (Step 4, 780 mg, 1.94 mmol) in THF (10 mL) were added Tin powder (807 mg, 6.80 mmol) and HCl conc (0.59 mL, 19.4 mmol). The solution was stirred at 70° C. for 4 h. The reaction was quenched by addition of sodium hydroxide and water. The solution was then extracted with EtOAc. The organic phase was washed with brine, dried over MgSO4, filtered and evaporated to give the title compound. UPLC-MS-1: Rt=0.93 min; MS m/z [M+H]+ 372.4.
3-Fluoro-4-(2-methyl-3-(5-methyl-1H-indazol-4-yl)-1H-pyrrolo[2,3-b]pyridin-1-yl)aniline as mixture of isomers (454 mg) in IPA (30 mg/mL) were separated by chiral SFC (column: Lux IC 5 μm; 250×21.2 mm; mobile phase: CO2/IPA 55/45; flow rate: 50 mL/min; column temperature: 40° C.; back pressure: 105 bars) to give 3-fluoro-4-(2-methyl-3-(5-methyl-1H-indazol-4-yl)-1H-pyrrolo[2,3-b]pyridin-1-yl)aniline as first eluting isomer (analytical chiral SFC; column: Chiralpak AD-H 5 μm; 250×4.6 mm; mobile phase: CO2/[IPA+1% isopropylamine]: 50/50; flow rate: 3 mL/min; column temperature: 40° C.; back pressure: 120 bars): Rt=2.99 min and 3-fluoro-4-(2-methyl-3-(5-methyl-1H-indazol-4-yl)-1H-pyrrolo[2,3-b]pyridin-1-yl)aniline as the second eluting isomer (analytical chiral SFC; column: Chiralpak AD-H 5 μm; 250×4.6 mm; mobile phase: CO2/[IPA+1% isopropylamine]: 50/50; flow rate: 3 mL/min; column temperature: 40° C.; back pressure: 120 bars): Rt=5.79 min. UPLC-MS-1: Rt=0.92 min; MS m/z [M+H]+ 372.2.
To a solution of 3-fluoro-4-(2-methyl-3-(5-methyl-1H-indazol-4-yl)-1H-pyrrolo[2,3-b]pyridin-1-yl)aniline (Step 6, second eluting peak, 19 mg, 0.05 mmol) in CH2Cl2 (1.5 mL) were added DIPEA (0.03 mL, 0.15 mmol) and acryloyl chloride (4.57 μl, 0.06 mmol) at 0° C. The reaction mixture was stirred at 0° C. for 4 h. MeOH was added to the mixture and evaporated to dryness. The reaction was quenched by addition of saturated solution of NaHCO3. The solution was then extracted with CH2Cl2. The organic phase was washed with brine, dried over MgSO4, filtered and evaporated. The crude product was purified by normal phase chromatography (eluent: EtOAc in n-heptane 0 to 100%) to give the title compound. 1H NMR (600 MHz, DMSO-d6) δ 13.12-13.03 (m, 1H), 10.63 (s, 1H), 8.21-8.16 (m, 1H), 8.03-7.96 (m, 1H), 7.79-7.45 (m, 5H), 7.43-7.37 (m, 1H), 7.18-7.10 (m, 1H), 6.54-6.45 (m, 1H), 6.40-6.32 (m, 1H), 5.90-5.83 (m, 1H), 2.29-2.22 (m, 3H), 2.09 (s, 3H); UPLC-MS-1: Rt=0.98 min; MS m/z [M+H]+; 426.4.
To an ice-cooled solution of 3-fluoro-4-(2-methyl-3-(5-methyl-1H-indazol-4-yl)-1H-pyrrolo[2,3-b]pyridin-1-yl)aniline (Compound A, step 6 second eluting peak) (50 mg, 0.14 mmol) in DMF (1.5 mL) was added a mixture of DIPEA (0.09 mL, 0.54 mmol), propiolic acid (9.43 mg, 0.14 mmol) and propylphosphonic anhydride (50% in DMF, 0.16 mL, 0.27 mmol). The reaction mixture was stirred at RT under nitrogen for 15 min. The reaction mixture was poured into a sat. aq. NaHCO3 solution and extracted with EtOAc (×3). The combined organic layers were dried over MgSO4, and concentrated. The crude product was purified by achiral SFC (column: Princeton PPU 5 μm; 250×30 mm; mobile phase: CO2/MeOH: gradient with 24-29% MeOH in CO2 over 9.8 minutes; flow rate: 30 mL/min; column temperature: 36° C.; back pressure: 120 bars) and re-purified by achiral SFC (column: Princeton PPU 5 μm; 250×30 mm; mobile phase: CO2/MeOH: gradient with 20-26% MeOH in CO2 over 9.8 minutes; flow rate: 30 mL/min; column temperature: 36° C.; back pressure: 120 bars) to give the title compound. UPLC-MS-1: Rt=0.97 min; MS m/z [M+H]+ 424.4.
N-(3-Fluoro-4-(2-methyl-3-(5-methyl-1H-indazol-4-yl)-1H-pyrrolo[2,3-b]pyridin-1-yl)phenyl)propiolamide (step 1) (3.20 mg, 7.56 μmol), Lindlar catalyst (6.57 mg), quinoline (11.8 μL, 12.90 mg, 99.6 μmol) were suspended in DMF (0.60 mL). The suspension was degassed three times at the high vacuum manifold and stirred under an atmosphere of tritium gas (355 GBq, 508 mbar initial pressure) for 80 mins at room temperature (end pressure was 505 mbar, no more tritium gas consumption was observed). The solvent was removed in vacuo, and labile tritium was exchanged by adding methanol (0.70 mL), stirring the solution, and removing the solvent again under vacuo. This process was repeated two times. Finally, the well dried solid was extracted with 5 mL of ethanol and the suspension was filtered through a 0.2 μm nylon membrane obtaining a clear and colourless solution. The radiochemical purity was determined to 86% by HPLC (Waters Sunfire HPLC with UV detector; column: C18 5 μm; 250×4.6 mm; mobile phase: A: water/B: acetonitrile, 0 min 10% B, 10 min 95% B, 14.5 min 95% B, 15 min 10% B; flow rate: 1 mL/min; column temperature: 30° C.). Purification of the crude product was carried out by reverse phase HPLC (Waters Sunfire; column: C18 5 μm; 250×10 mm; detection UV 254 nM; mobile phase: A: water/B: MeOH, isocratic 62% B; flow rate: 4.7 mL/min; column temperature: 25° C.). The target compound eluted at 19.1 min. The combined HPLC fractions were partially reduced at the rotary evaporator at 40° C. Then, the product was extracted with a Phenomenex StrataX cartridge (33 μm Polymeric Reversed Phase, 100 mg, 3 mL; 8B-S100-EB) which was eluted with 5 mL of ethanol. The extracted product contained the title compound with an activity of 2.61 GBq and a radiochemical purity of >99%. The molar activity was determined to be 2.12 TBq/mmol.
A scintillation proximity assay (SPA) was used to determine the potency of the compounds.
This assay measures the ability of the test compound to compete with the radiolabeled covalent probe for binding to and covalently modify KRASG12C.
The signal to be measured is generated by binding of an isotopic dilution of the covalent radio-ligand [[acrylamide-2,3-3H2]—N-(3-fluoro-4-(2-methyl-3-(5-methyl-1H-indazol-4-yl)-1H-pyrrolo[2,3-b]pyridin-1-yl)phenyl)acrylamide (Compound B) (2.12 TBq/mmol) and its non-labeled analog [N-(3-fluoro-4-(2-methyl-3-(5-methyl-1H-indazol-4-yl)-1H-pyrrolo[2,3-b]pyridin-1-yl)phenyl)acrylamide (Compound A) to KRasG12C (M1-K169, biotinylated on the N-terminus) which is bound to SPA beads via biotin-streptavidin coupling. (see above for synthesis of Compound A and Compound B). A serial dilution of the compounds to be tested is mixed with a fixed concentration of the radiolabeled covalent probe before incubation with KRASG12C:GDP as described below. KRASG12C can either be bound by the radiolabeled covalent probe (Compound B), resulting in light being emitted from the beads, or bound by covalent test compound preventing signal generation.
Assays were run using 384-well plates (781207/Greiner) in which one column was designated as the high signal (no inhibition) control, and contained DMSO with no test compound, and another column was designated as the low signal control (maximal inhibition), and contained no protein. Serial dilutions of compounds to be tested were added to the assay plate (resulting in duplicate 11-point dose response with semi-log compound dilutions from 50 μM to 0.5 nM or from 5 μM to 0.05 nM for the most potent compounds). A 1/20 isotopic dilution of labeled (Compound B) and non-labeled covalent (Compound A) probe was prepared and added to all wells on the plate. The reaction was started by addition of KRasG12C (M1-K169, biotinylated on the N-terminus) to the compounds and incubated for 2 hours with continuous agitation allowing for full modification of KRasG12C with probe or test compounds. Final concentrations in an assay volume of 40 μL were 10 nM KRasG12C, 25 nM radio-ligand and 475 nM unlabelled ligand. The assay buffer contained 20 mM Tris-HCl pH 7.5 (Invitrogen), 150 mM NaCl (Sigma Aldrich), 0.1 mM MgCl2 (Sigma Aldrich), and 0.01% Tween-20 (Sigma Aldrich). Following addition of 50 μL of a 400 μg/mL suspension of streptavidin-coated YSi beads (Perkin Elmer), plates were incubated for a further 30 min with continuous agitation before reading the plates on a scintillation counter (Topcount NXT 384 (Packard).
Evaluation was carried out using assay data analysis software (such as the standard Novartis in-house Helios software application, Novartis Institutes for BioMedical Research, unpublished) using the methods described in Formenko et al., Robust Regression for high-throughput screening, Computer Methods and Programs in Biomedicine, 2006, 82, 31-37. Following normalization of activity values for the wells to % inhibition (% inhibition=[(high control−sample)/(high control−low control)]×100), IC50 fitting was carried out from the duplicate determinations present on each plate according to Formenko et al., 2006.
Evaluation can also be carried out using commercially available software which is designed to derive IC50 values using 4-parameter fits (e.g. GraphPad Prism, XL fit).
Titration of the non-labelled version of the probe, Compound A, in this assay resulted in an IC50 of 0.5 □M. IC50 values for examples 1 to 94 are tabulated in Table 2.
Note: Endpoint IC50 values generated in this way could in principle be used to derive second order rate constants for the covalent binders in agreement with a method described by Miyahisa et al. 2015, Rapid Determination of the Specificity Constant of Irreversible Inhibitors (kinact/KI) by Means of an Endpoint Competition Assay, Angew. Chem, Int, Ed. Engl, 2015 Nov. 16; 54(47):14099-14102).
Following this, rate constants can be derived applying the equation (kinact/KI)inhibitor=(kinact/KI)probe×[probe]/IC50 using 0.5 μM as [probe]. “(kinact/KI)probe”, the second order rate constant for modification of KRasG12C by this probe was internally determined to ˜5,000 M-1*s-1 for the non-labeled ligand [N-(3-fluoro-4-(2-methyl-3-(5-methyl-1H-indazol-4-yl)-1H-pyrrolo[2,3-b]pyridin-1-yl)phenyl)acrylamide (Compound A) using an MS-based assay (assessing % modification for a range of compound concentrations and time points).
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/IB2022/055789 | 6/22/2022 | WO |
| Number | Date | Country | |
|---|---|---|---|
| 63214009 | Jun 2021 | US |
