Patent Application
20230065368
This disclosure relates to novel chemical compositions for inhibiting ubiquitin specific peptidase 9X.
Deubiquitylating enzymes (DUBs) control a number of cellular processes, including the stability and function of a variety of oncoproteins, by reversing ubiquitination. Ubiquitin specific peptidase 9X (USP9X) is a member of the USP family of DUBs and is a key regulator of protein homeostasis for protein substrates including several that are known to be important in cancer. These include oncogenic or protumorigenic proteins and proteins involved in the anti-tumor immune response. These proteins can be important in tumor cells, immune cells, or other cells, such as stromal cells that play a role in cancer. Examples include MCL-1, survivin, ITCH, and CEP55. Overexpression and/or mutation of DUBs and their substrates have been correlated with cancer initiation and progression. USP9X has been suggested to be a negative prognostic factor for several oncology indications and may be associated with decreased overall survival in some cancer types (e.g., esophageal squamous cell carcinoma, non-small cell lung cancer, and multiple myeloma). Targeting USP9X can enhance an anti-tumor immune response through regulation of key maintenance proteins. Therefore, USP9X is a target for cancer drug development, particularly as a means to deplete oncoprotein substrates that have been labeled undruggable and/or through activation of the immune response. There is a need for compounds that inhibit USP9X and are useful for treating diseases and disorders associated with modulation of USP9X.
One aspect of this disclosure relates to compounds of Formula I.
or a pharmaceutically acceptable salt thereof, wherein:
Another aspect of this invention relates to compounds of Formula I that are USP9X Inhibitors. Unless otherwise indicated, a “USP9X Inhibitor” as used herein refers to a compound of Formula I having one or more of the following characteristics when tested in the Biochemical Assay of Example 1: (i) an IC50 value of ≤2 μM and >0.001 μM; (ii) an IC50 value of ≤0.2 μM and >0.001 μM; and (iii) an IC50 value of ≤0.05 μM and >0.001 μM. In some embodiments, a USP9X Inhibitor is a compound of Formula I having an IC50 value of ≤2 μM and >0.001 μM when tested in the Biochemical Assay of Example 1. In some embodiments, a USP9X Inhibitor is a compound of Formula I having an IC50 value of ≤0.2 μM and >0.001 μM when tested in the Biochemical Assay of Example 1. In some embodiments, a USP9X Inhibitor is a compound of Formula I having an IC50 value of ≤0.05 μM and >0.001 μM when tested in the Biochemical Assay of Example 1.
In some embodiments, a USP9X Inhibitor is provided, wherein Ring A contains at least one oxygen atom (e.g., dioxane, tetrahydropyran, morpholine, or furan). In some embodiments, a USP9X Inhibitor is provided, wherein Ring A does not contain a nitrogen atom (e.g., dioxane, tetrahydropyran, or furan). In some embodiments, a USP9X Inhibitor is provided, wherein Ring A contains at least one oxygen atom and does not contain a nitrogen atom (e.g., dioxane, tetrahydropyran, or furan). In some embodiments, a USP9X Inhibitor is provided, wherein Y1, Y2, and Y3 are not further substituted (e.g., N or CH).
In some embodiments, a USP9X Inhibitor is provided, wherein one of R1 and R2 is —H, resulting in a disubstituted α-carbon. In some embodiments, one of R1 and R2 is —H, and the other is a small group, i.e., a group small enough so that the compound is a USP9X Inhibitor, (e.g., —OH, —NHC(O)Me, or —CH2NHMe). In some embodiments, one of R1 and R2 is —H, and the other is not a bulky group, i.e., the other is not a bulky group such that the compound is a USP9X Inhibitor. In some embodiments, one of R1 and R2 is —H, and the other is a neutral group, i.e., a group that is natural so that the compound is a USP9X Inhibitor, (e.g., —OH or —NHC(O)Me). In some embodiments, one of R1 and R2 is —H, and the other is a neutral, hydrogen bond-donating group, i.e., a group that is neutral and hydrogen-bonding donating so that the compound is a USP9X Inhibitor, (e.g., —OH or —NHC(O)Me). In some embodiments, one of R1 and R2 is —H, and the other is a basic group, i.e., a group that is basic enough so that the compound is a USP9X Inhibitor, (e.g., —CH2NHMe, —CH2azetidinyl, —CH2pyrrolidinyl, or —CH2morpholinyl). In some embodiments, a USP9X Inhibitor is provided, wherein one of R1 and R2 are —H, and the other is a basic group with a pKa of the conjugate acid of approximately 8 or approximately 8.5 (e.g., —CH2NHMe, —CH2azetidinyl, —CH2pyrrolidinyl, or —CH2morpholinyl).
In some embodiments, a USP9X Inhibitor is provided, wherein B is a monocyclic aryl (e.g., phenyl). In some embodiments, a USP9X Inhibitor is provided, wherein B is a monocyclic aryl substituted in the meta position with Rd (e.g., fluoro, chloro, methyl, ethyl, —CHF2, —CF3, cyclopropyl, oxetanyl, piperazinyl, N-methylpiperazinyl, 2-(difluoromethyl)piperazinyl, 4-cyclopropylpiperazinyl, morpholinyl, 2-methyloctahydropyrrolo[3,4-c]pyrrolyl, 2-oxa-7-azaspiro[3.5]nonanyl, 2-methyl-1,2,3,4,5,6-hexahydropyrrolo[3,4-c]-pyrrolyl, 3a-fluoro-2-methyloctahydropyrrolo[3,4-c]pyrrolyl, 9,9-difluoro-3,7-diazabicyclo[3.3.1]nonanyl, —OMe, —OCHF2, —O(cyclopropyl), —O(cyclobutyl), —O(N-methylazetidinyl), or —N(Me)(CH2CH2OH)). In some embodiments, B is a monocyclic aryl substituted in the meta position with a large Rd group, i.e., a group that is large enough so that the compound is a USP9X Inhibitor, (e.g., piperazinyl, N-methylpiperazinyl, 2-(difluoromethyl)piperazinyl, 4-cyclopropylpiperazinyl, morpholinyl, 2-methyloctahydropyrrolo[3,4-c]pyrrolyl, 2-oxa-7-azaspiro[3.5]nonanyl, 2-methyl-1,2,3,4,5,6-hexahydropyrrolo[3,4-c]-pyrrolyl, 3a-fluoro-2-methyloctahydropyrrolo[3,4-c]pyrrolyl, or 9,9-difluoro-3,7-diazabicyclo[3.3.1]nonanyl). In some embodiments, B is a monocyclic aryl substituted in the meta position with a basic Rd group, i.e., a group that is basic enough so that the compound is a USP9X Inhibitor, (e.g., piperazinyl, N-methylpiperazinyl, 2-(difluoromethyl)piperazinyl, 4-cyclopropylpiperazinyl, morpholinyl, 2-methyloctahydropyrrolo[3,4-c]pyrrolyl, 2-oxa-7-azaspiro[3.5]nonanyl, or —N(Me)(CH2CH2OH)). In some embodiments, B is a monocyclic aryl substituted in the para position with a small Rd group, i.e., a group that is small enough so that the compound is a USP9X Inhibitor, (e.g., fluoro, chloro, or —OMe). In some embodiments, B is a monocyclic aryl with —H in the para position. In some embodiments, B is a monocyclic aryl substituted in the ortho position with a small Rd group, i.e., a group that is small enough so that the compound is a USP9X Inhibitor, (e.g., fluoro, chloro, or —OMe). In some embodiments, B is a monocyclic aryl with —H in the ortho position. In some embodiments, B is a bicyclic ring, wherein at least one of the rings is an aromatic ring.
In some embodiments, a USP9X Inhibitor is provided, wherein Ring A contains at least one oxygen atom; one of R1 and R2 is —H; and B is a monocyclic aryl. In some embodiments, a USP9X Inhibitor is provided, wherein Ring A contains at least one oxygen atom; one of R1 and R2 is —H, and the other is a small group, i.e., a group small enough so that the compound is a USP9X Inhibitor; and B is a monocyclic aryl. In some embodiments, a USP9X Inhibitor is provided, wherein Ring A contains at least one oxygen atom; one of R1 and R2 is —H, and the other is a neutral group, i.e., a group that is neutral so that the compound is a USP9X Inhibitor; and B is a monocyclic aryl. In some embodiments, a USP9X Inhibitor is provided, wherein Ring A contains at least one oxygen atom; one of R1 and R2 is —H, and the other is a neutral, hydrogen bond-donating group, i.e., a group that is neutral and hydrogen-bonding donating so that the compound is a USP9X Inhibitor; and B is a monocyclic aryl. In some embodiments, a USP9X Inhibitor is provided, wherein Ring A contains at least one oxygen atom; one of R1 and R2 is —H, and the other is a basic group, i.e., a group that is basic enough so that the compound is a USP9X Inhibitor; and B is a monocyclic aryl. In some embodiments, a USP9X Inhibitor is provided, wherein Ring A contains at least one oxygen atom; one of R1 and R2 are —H, and the other is a basic group with a pKa of the conjugate acid of approximately 8 or approximately 8.5; and B is a monocyclic aryl.
In some embodiments, a USP9X Inhibitor is provided, wherein Ring A contains at least one oxygen atom; one of R1 and R2 is —H; and B is a monocyclic aryl substituted in the meta position with Rd. In some embodiments, a USP9X Inhibitor is provided, wherein Ring A contains at least one oxygen atom; one of R1 and R2 is —H, and the other is a small group, i.e., a group small enough so that the compound is a USP9X Inhibitor; and B is a monocyclic aryl substituted in the meta position with Rd. In some embodiments, a USP9X Inhibitor is provided, wherein Ring A contains at least one oxygen atom; one of R1 and R2 is —H, and the other is a neutral group, i.e., a group that is neutral so that the compound is a USP9X Inhibitor; and B is a monocyclic aryl substituted in the meta position with Rd. In some embodiments, a USP9X Inhibitor is provided, wherein Ring A contains at least one oxygen atom; one of R1 and R2 is —H, and the other is a neutral, hydrogen bond-donating group, i.e., a group that is neutral and hydrogen-bonding donating so that the compound is a USP9X Inhibitor; and B is a monocyclic aryl substituted in the meta position with Rd. In some embodiments, a USP9X Inhibitor is provided, wherein Ring A contains at least one oxygen atom; one of R1 and R2 is —H, and the other is a basic group, i.e., a group that is basic enough so that the compound is a USP9X Inhibitor; and B is a monocyclic aryl substituted in the meta position with Rd. In some embodiments, a USP9X Inhibitor is provided, wherein Ring A contains at least one oxygen atom; one of R1 and R2 are —H, and the other is a basic group with a pKa of the conjugate acid of approximately 8 or approximately 8.5; and B is a monocyclic aryl substituted in the meta position with Rd.
In some embodiments, a USP9X Inhibitor is provided, wherein Ring A contains at least one oxygen atom; one of R1 and R2 is —H; and B is a bicyclic ring, wherein at least one of the rings is an aromatic ring. In some embodiments, a USP9X Inhibitor is provided, wherein Ring A contains at least one oxygen atom; one of R1 and R2 is —H, and the other is a small group, i.e., a group small enough so that the compound is a USP9X Inhibitor; and B is a bicyclic ring, wherein at least one of the rings is an aromatic ring. In some embodiments, a USP9X Inhibitor is provided, wherein Ring A contains at least one oxygen atom; one of R1 and R2 is —H, and the other is a neutral group, i.e., a group that is neutral so that the compound is a USP9X Inhibitor; and B is a bicyclic ring, wherein at least one of the rings is an aromatic ring. In some embodiments, a USP9X Inhibitor is provided, wherein Ring A contains at least one oxygen atom; one of R1 and R2 is —H, and the other is a neutral, hydrogen bond-donating group, i.e., a group that is neutral and hydrogen-bonding donating so that the compound is a USP9X Inhibitor; and B is a bicyclic ring, wherein at least one of the rings is an aromatic ring. In some embodiments, a USP9X Inhibitor is provided, wherein Ring A contains at least one oxygen atom; one of R1 and R2 is —H, and the other is a basic group, i.e., a group that is basic enough so that the compound is a USP9X Inhibitor; and B is a bicyclic ring, wherein at least one of the rings is an aromatic ring. In some embodiments, a USP9X Inhibitor is provided, wherein Ring A contains at least one oxygen atom; one of R1 and R2 are —H, and the other is a basic group with a pKa of the conjugate acid of approximately 8 or approximately 8.5; and B is a bicyclic ring, wherein at least one of the rings is an aromatic ring.
One aspect of this invention relates to compounds of Formula I.
or a pharmaceutically acceptable salt thereof,
In some embodiments, compounds are provided that are compounds of Formula II:
or a pharmaceutically acceptable salt thereof,
In some embodiments, compounds are provided that are compounds of Formula II-a:
or a pharmaceutically acceptable salt thereof,
In some embodiments, compounds are provided that are compounds of Formula II-b:
or a pharmaceutically acceptable salt thereof,
In some embodiments, compounds are provided that are compounds of Formula II-c:
or a pharmaceutically acceptable salt thereof,
In some embodiments, compounds are provided that are compounds of Formula III:
or a pharmaceutically acceptable salt thereof,
In some embodiments, compounds are provided that are compounds of Formula III-a:
or a pharmaceutically acceptable salt thereof,
In some embodiments, compounds are provided that are compounds of Formula III-b:
or a pharmaceutically acceptable salt thereof,
wherein B, R1, and R2 are as defined above, and
wherein Y2 is CH or N.
In some embodiments, compounds are provided that are compounds of Formula III-c:
or a pharmaceutically acceptable salt thereof, wherein:
In some embodiments, compounds of Formula III are provided, wherein:
In some embodiments, compounds of Formula III are provided, wherein:
is selected from the group consisting of:
In some embodiments, compounds are provided that are compounds of Formula IV:
or a pharmaceutically acceptable salt thereof,
In some embodiments, compounds are provided that are compounds of Formula IV-a:
or a pharmaceutically acceptable salt thereof,
In some embodiments, compounds are provided that are compounds of Formula IV-b:
or a pharmaceutically acceptable salt thereof,
In some embodiments, compounds of Formula IV are provided, wherein:
In some embodiments, compounds of Formula IV are provided, wherein:
is selected from the group consisting of:
R1 and R2 are each independently —H, —OH, or —CH2NHMe;
B is a monocyclic or bicyclic 3- to 14-membered ring selected from the group consisting of:
wherein the ring is optionally substituted with one or more Rd; and
each Rd is independently selected from the group consisting of fluoro, chloro, methyl, and —OMe.
In some embodiments, compounds are provided that are compounds of Formula V:
or a pharmaceutically acceptable salt thereof,
In some embodiments, compounds are provided that are compounds of Formula V-a:
or a pharmaceutically acceptable salt thereof,
In some embodiments, compounds are provided that are compounds of Formula V-b:
or a pharmaceutically acceptable salt thereof,
In some embodiments, compounds of Formula V are provided, wherein:
In some embodiments, compounds of Formula V are provided, wherein:
R1 and R2 are each independently —H or —OH;
B is a monocyclic or bicyclic 3- to 14-membered ring selected from the group consisting of:
wherein the ring is optionally substituted with one or more —OMe.
In some embodiments, compounds are provided that are compounds of Formula I-a:
or a pharmaceutically acceptable salt thereof,
In some embodiments, compounds are provided that are compounds of Formula I-b:
or a pharmaceutically acceptable salt thereof,
In some embodiments, compounds are provided that are compounds of Formula III-d:
or a pharmaceutically acceptable salt thereof,
In some embodiments, compounds are provided that are compounds of Formula III-e:
or a pharmaceutically acceptable salt thereof,
In some embodiments of Formulas I, I-a, I-b, II, II-a, II-b, and II-c, at least one dashed bond is a double bond. In some embodiments, one dashed bond is a double bond. In some embodiments, two dashed bonds are double bonds.
In some embodiments of Formulas I, I-a, I-b, II, II-a, II-b, and II-c, X is CR5R6, CR5, or N. In some embodiments, X is CR5R6. In some embodiments, X is CR5. In some embodiments, X is NR5. In some embodiments, X is N. In some embodiments, X is CH2. In some embodiments, X is CH. In some embodiments, X is NH.
In some embodiments of Formulas I, I-a, I-b, II, II-a, III, III-a, III-d, III-e, IV, IV-a, V, and V-a, Y1, Y2, and Y3 are each independently CRa. In some embodiments, Y1, Y2, and Y3 are each CH. In some embodiments, at least one of Y1, Y2, and Y3 is N. In some embodiments, at least one of Y1 and Y2 is N. In some embodiments, Y1 is CRa. In some embodiments, Y1 is N. In some embodiments, Y2 is CRa. In some embodiments, Y2 is N. In some embodiments, Y3 is CRa. In some embodiments, Y3 is N.
In some embodiments of Formulas I, I-a, I-b, II, II-a, III, III-a, III-d, III-e, IV, IV-a, V, and V-a, each Ra is independently —H, —F, —Cl, or —CN. In some embodiments, each Ra is —H. In some embodiments, each Ra is —F. In some embodiments, each Ra is —Cl. In some embodiments, each Ra is —CN.
In some embodiments of Formulas I, I-a, I-b, II, II-a, III, III-a, III-d, III-e, IV, IV-a, V, and V-a, Ring A is a 5- to 6-membered heteroaryl containing 1-4 heteroatoms independently selected from the group consisting of O, N, and S, or a 5- to 6-membered heterocyclyl containing 1-4 heteroatoms independently selected from the group consisting of O, N, and S, wherein each heteroaryl or heterocyclyl is optionally substituted with one or more halogen or —C1-C6 alkyl. In some embodiments, Ring A is a 5- to 6-membered heteroaryl containing 1-4 heteroatoms independently selected from the group consisting of O, N, and S, or a 5- to 6-membered heterocyclyl containing 1-4 heteroatoms independently selected from the group consisting of O, N, and S, wherein each heteroaryl or heterocyclyl contains at least one oxygen atom and is optionally substituted with one or more halogen or —C1-C6 alkyl. In some embodiments, Ring A is a 5- to 6-membered heterocyclyl containing 1-4 heteroatoms independently selected from the group consisting of O, N, and S, wherein heterocyclyl contains at least one oxygen atom and is optionally substituted with one or more halogen or —C1-C6alkyl. In some embodiments, Ring A is an unsubstituted 5- to 6-membered heterocyclyl containing 1-4 heteroatoms independently selected from the group consisting of O, N, and S and containing at least one oxygen atom. In some embodiments, Ring A is an unsubstituted 5- to 6-membered heteroaryl containing 1-4 heteroatoms independently selected from the group consisting of O, N, and S and containing at least one oxygen atom.
In some embodiments of Formulas I, I-a, I-b, II, II-a, III, III-a, III-d, III-e, IV, IV-a, V, and V-a,
is selected from the group consisting of:
In some embodiments,
is selected from the group consisting of:
In some embodiments,
is selected from the group consisting of:
In some embodiments,
In some embodiments,
In some embodiments,
In some embodiments of Formulas I, I-a, I-b, III, III-d, III-e, IV, and V, Z1 is O or S. In some embodiments, Z1 is O. In some embodiments, Z1 is S. In some embodiments, Z1 is NR. In some embodiments, Z1 is NH, NOH, or NNH2.
In some embodiments of Formulas I, I-a, I-b, II, III, III-d, III-e, IV, and V, Z2 is O or NH. In some embodiments, Z2 is O. In some embodiments, Z2 is NR. In some embodiments, Z2 is NH.
In some embodiments of Formula I,W is CR1′R2′. In some embodiments, W is CH2. In some embodiments, W is O, S, or NR. In some embodiments, W is O. In some embodiments, W is S. In some embodiments, W is NR (e.g., NH).
In some embodiments of Formulas I, I-a, I-b, II, II-a, II-b, II-c, III, III-a, III-b, III-d, III-e, IV, IV-a, IV-b, V, V-a, and V-b, R1 and R2 are each independently selected from the group consisting of —H, halogen (e.g., fluoro), —C1-C6alkyl (e.g., methyl), —(CRbRc)nC3-C12cycloalkyl (e.g., —(CH2)ncyclopropyl), —(CRbRc)nheterocyclyl (e.g., —(CH2)nazetidinyl, —(CH2)npyrrolidinyl, —(CH2)npyrrolidinonyl, or —(CH2)nmorpholinyl), —OR, —(CRbRc)nNR2 (e.g., —(CH2)nNR2), —(CRbRc)nNRC(O)R′ (e.g., —(CH2)nNHC(O)R′), —(CRbRc)nNRS(O)2R′ (e.g., —(CH2)nNHS(O)2R′), or —(CRbRc)nNRC(O)NR2 (e.g., —(CH2)nNHC(O)NHR),
In some embodiments of Formulas I, I-a, I-b, II, II-a, II-b, II-c, III, III-a, III-b, III-d, III-e, IV, IV-a, IV-b, V, V-a, and V-b, R1 and R2 are each independently —H, halogen, —C1-C6alkyl, —(CRbRc)nC3-C12cycloalkyl, —(CRbRc)nheterocyclyl, —OR, —OC(O)R′, —OS(O)2R′, —OS(O)2NR2, —OC(O)NR2, —OC(O)OR, —(CRbRc)nNR2, —(CRbRc)nNRC(O)R′, —(CRbRc)nNRS(O)2R′, —(CRbRc)nNRC(O)NR2, or —(CRbRc)nNRC(O)OR, wherein each heterocyclyl is optionally substituted with one or more substituents selected from the group consisting of halogen, —OR, and oxo, and wherein —OR does not result in an O in the γ-position relative to C(═Z1), wherein each heterocyclyl is 3- to 14-membered and contains 1-4 heteroatoms independently selected from the group consisting of O, N, and S, and wherein the heterocyclyl does not contain an O in the γ-position relative to C(═Z1); or R1 and R2 combine with the carbon to which they are attached to form a C3-C8cycloalkyl or 3- to 8-membered heterocyclyl containing 1-4 heteroatoms independently selected from the group consisting of O, N, and S, wherein the heterocyclyl does not contain an O in the γ-position relative to C(═Z1). In some embodiments, R1 and R2 are each independently selected from the group consisting of —H, halogen (e.g., fluoro), —C1-C6alkyl (e.g., methyl), —(CRbRc)nheterocyclyl (e.g., —(CH2)nazetidinyl or —(CH2)npyrrolidinyl), —OR, —(CRbRc)nNR2 (e.g., —(CH2)nNR2), —(CRbRc)nNRC(O)R′ (e.g., —(CH2)nNHC(O)R′), or —(CRbRc)nNRC(O)NR2 (e.g., —(CH2)nNHC(O)NHR), wherein each heterocyclyl (e.g., azetidinyl) is optionally substituted with one or more halogen (e.g., fluoro), and wherein each heterocyclyl is 3- to 14-membered and contains 1-4 heteroatoms independently selected from the group consisting of O, N, and S, and wherein the heterocyclyl does not contain an O in the γ-position relative to C(═Z1); or R1 and R2 combine with the carbon to which they are attached to form a 3- to 8-membered heterocyclyl containing 1-4 heteroatoms independently selected from O, N, and S (e.g., pyrrolidinyl), wherein the heterocyclyl does not contain an O in the γ-position relative to C(═Z1). In some embodiments, R1 and R2 are each independently —H, —OR, —(CRbRc)nNR2, or —(CRbRc)nNRC(O)R′. In some embodiments, R1 and R2 are each independently —H, —OR, —CH2NR2, or —CH2NRC(O)R′. In some embodiments, R1 and R2 are each independently —H, —OH, —CH2NHMe, or —CH2NHC(O)Me. In some embodiments, R1 and R2 are each independently —H, —OH, or —CH2NHMe. In some embodiments, one of R1 and R2 is not —H. In some embodiments, R′ is —OH. In some embodiments, R2 is —H.
In some embodiments of Formulas I, I-a, I-b, II, II-a, II-b, II-c, III, III-a, III-b, III-d, III-e, IV, IV-a, IV-b, V, V-a, and V-b, R1′ and R2′ are each independently selected from the group consisting of —H, halogen, —C1-C6alkyl, —(CRbRc)nC3-C12cycloalkyl, —(CRbRc)nheterocyclyl, —(CRbRc)nNR2, —(CRbRc)nNRC(O)R′, —(CRbRc)nNRS(O)2R′, —(CRbRc)nNRC(O)NR2, or —(CRbRc)nNRC(O)OR,
In some embodiments of Formulas I, I-a, I-b, II, II-a, II-b, II-c, III, III-a, III-b, III-d, III-e, IV, IV-a, IV-b, V, V-a, and V-b, R1′ and R2′ are each independently selected from the group consisting of —H, halogen, —C1-C6alkyl, —(CRbRc)nheterocyclyl, —(CRbRc)nNR2, —(CRbRc)nNRC(O)R′, or —(CRbRc)nNRC(O)NR2, wherein each heterocyclyl is optionally substituted with one or more halogen, and wherein each heterocyclyl is 3- to 14-membered and contains 1-4 heteroatoms independently selected from the group consisting of O, N, and S, and wherein the heterocyclyl does not contain an O in the γ-position relative to C(═Z1); or R1′ and R2′ combine with the carbon to which they are attached to form a 3- to 8-membered heterocyclyl containing 1-4 heteroatoms independently selected from O, N, and S, wherein the heterocyclyl does not contain an O in the γ-position relative to C(═Z1). In some embodiments, R1′ and R2′ are each independently —H, —(CRbRc)nNR2, or —(CRbRc)nNRC(O)R′. In some embodiments, R1′ and R2′ are each —H.
In some embodiments of Formulas I, I-a, I-b, II, II-a, II-b, II-c, III, III-a, III-b, III-d, III-e, IV, IV-a, IV-b, V, V-a, and V-b, Rb and Rc are each independently —H, —F, or —C1-C6alkyl. In some embodiments, Rb and Rc are each independently —H, —F, or methyl. In some embodiments, Rb and Rc are both —H. In some embodiments, Rb and Rc are both halogen. In some embodiments, Rb and Rc are both —C1-C6alkyl. In some embodiments, one of Rb and Rc is halogen. In some embodiments, one of R and R is —C1-C6alkyl (e.g., methyl). In some embodiments, one of Rb and Rc is —F.
In some embodiments of Formulas I, I-a, I-b, II, II-a, II-b, II-c, III, III-a, III-b, III-d, III-e, IV, IV-a, IV-b, V, V-a, and V-b, each n is independently 0, 1, or 2. In some embodiments, each n is 0. In some embodiments, each n is 1. In some embodiments, each n is 2.
In some embodiments of Formula I, m is 0. In some embodiments, m is 1.
In some embodiments of Formulas I, I-a, I-b, II, II-a, II-b, II-c, III, III-a, III-b, III-d, III-e, IV, IV-a, IV-b, V, V-a, and V-b:
In some embodiments of Formulas I, I-a, I-b, II, II-a, II-b, II-c, III, III-a, III-b, III-d, III-e, IV, IV-a, IV-b, V, V-a, and V-b, B is a phenyl ring or a bicyclic ring, wherein at least one of the rings in the bicyclic ring is a phenyl ring, wherein the phenyl ring or bicyclic ring contains 0-4 heteroatoms independently selected from the group consisting of O, N, and S, and wherein the phenyl ring or bicyclic ring is optionally substituted with one or more Rd. In some embodiments, B is a phenyl ring optionally substituted with one or more Rd. In some embodiments, B is a phenyl ring optionally substituted with one or more Rd and is fused to an aromatic, saturated, or partially unsaturated 5- to 8-membered carbocyclic or heterocyclic ring. In some embodiments, B is a phenyl ring optionally substituted with one or more Rd and is fused to a saturated or partially unsaturated 5- to 8-membered heterocyclic ring. In some embodiments, B is a monocyclic or bicyclic heteroaryl ring, wherein the ring contains 1-4 heteroatoms independently selected from the group consisting of O, N, and S, and wherein the ring is optionally substituted with one or more Rd.
In some embodiments, B is selected from the group consisting of:
wherein the ring is optionally substituted with one or more Rd.
In some embodiments, B is selected from the group consisting of:
wherein the ring is optionally substituted with one or more Rd.
In some embodiments, B is selected from the group consisting of:
wherein the ring is optionally substituted with one or more Rd.
In some embodiments of Formulas I, I-a, I-b, II, II-a, II-b, II-c, III, III-a, III-b, III-d, III-e, IV, IV-a, IV-b, V, V-a, and V-b, each Rd is independently selected from the group consisting of halogen (e.g., fluoro or chloro), —OR (e.g., —OMe, —OCHF2, —O(CH2)2NMe2, —O(cyclopropyl), or —O(cyclobutyl)), —NR2 (e.g., —N(Me)(CH2CH2OMe)), —C(O)NR2 (e.g., —C(O)NMe2), —C1-C6alkyl (e.g., methyl, ethyl, —CHF2, or —CF3), —C3-C12cycloalkyl (e.g., cyclopropyl), 3- to 14-membered heterocyclyl containing 1-4 heteroatoms independently selected from the group consisting of O, N, and S (e.g., oxetanyl, piperazinyl, N-methylpiperazinyl, 2-(difluoromethyl)piperazinyl, 4-cyclopropylpiperazinyl, morpholinyl, 2-methyloctahydropyrrolo[3,4-c]pyrrolyl, 2-oxa-7-azaspiro[3.5]nonanyl, 2-methyl-1,2,3,4,5,6-hexahydropyrrolo[3,4-c]pyrrolyl, 3a-fluoro-2-methyloctahydropyrrolo[3,4-c]pyrrolyl, or 9,9-difluoro-3,7-diazabicyclo[3.3.1]nonanyl), and C6-C14aryl (e.g., 4-fluorophenyl, or phenyl, naphthyl, or anthracenyl), wherein each alkyl (e.g., methyl or ethyl), heterocyclyl (e.g., piperazinyl or octahydropyrrolo[3,4-c]pyrrolyl), or aryl (e.g., phenyl) is optionally substituted with one or more substituents selected from the group consisting of halogen (e.g., fluoro), —C1-C6alkyl (e.g., methyl) optionally substituted with one or more halogen (e.g., fluoro), or —C3-C12cycloalkyl (e.g., cyclopropyl). In some embodiments, each Rd is independently selected from the group consisting of halogen (e.g., fluoro or chloro), —OR (e.g., —OMe, —OCHF2, —O(CH2)2NMe2, —O(cyclopropyl), or —O(cyclobutyl)), —C1-C6alkyl (e.g., methyl, ethyl, —CHF2, or —CF3), —C3-C12cycloalkyl (e.g., cyclopropyl), and 3- to 14-membered heterocyclyl containing 1-4 heteroatoms independently selected from the group consisting of O, N, and S (e.g., oxetanyl, piperazinyl, N-methylpiperazinyl, 2-(difluoromethyl)piperazinyl, 4-cyclopropylpiperazinyl, morpholinyl, 2-methyloctahydropyrrolo[3,4-c]pyrrolyl, 2-oxa-7-azaspiro[3.5]nonanyl, 2-methyl-1,2,3,4,5,6-hexahydropyrrolo[3,4-c]pyrrolyl, 3a-fluoro-2-methyloctahydropyrrolo[3,4-c]pyrrolyl, or 9,9-difluoro-3,7-diazabicyclo[3.3.1]nonanyl). In some embodiments, each Rd is independently selected from the group consisting of halogen (e.g., fluoro or chloro), —C1-C6alkyl (e.g., methyl), and —OR (e.g., —OMe or —O(1-methylazetidinyl)).
In some embodiments of Formulas I, I-a, I-b, II, II-a, II-b, and II-c, each R3, R4, R5, R6, R7, R8, R9, and R10, if present, is —H.
In some embodiments of Formulas I, I-a, I-b, II, II-a, II-b, II-c, III, III-a, III-b, III-d, III-e, IV, IV-a, IV-b, V, V-a, and V-b, each R is independently selected from the group consisting of —H, —C1-C6alkyl (e.g., methyl, ethyl, or isopropyl), —C3-C12cycloalkyl (e.g., cyclopropyl or cyclobutyl), and 3- to 14-membered heterocyclyl containing 1-4 heteroatoms independently selected from the group consisting of O, N, and S (e.g., azetidinyl or oxetanyl), wherein each alkyl (e.g., methyl or ethyl) or heterocyclyl (e.g., azetidinyl) is optionally substituted with one or more halogen (e.g., fluoro), —O—C1-C6alkyl (e.g., —OMe), —NH—C1-C6alkyl (e.g., —NHMe), —N(C1-C6alkyl)2 (e.g., —NMe2), —C1-C6alkyl optionally substituted with —OH (e.g., methyl or —(CH2)2OH), —C3-C12cycloalkyl (e.g., cyclobutyl or cyclopentyl), or 3- to 8-membered heterocyclyl containing 1-4 heteroatoms independently selected from the group consisting of O, N, and S (e.g., 1-methylazetidinyl or tetrahydropyranyl). In some embodiments, each R is independently —H, —C1-C6alkyl (e.g., methyl), or 3- to 8-membered heterocyclyl optionally substituted with C1-C6alkyl (e.g., 1-methylazetidinyl). In some embodiments, each R is independently —H or methyl.
In some embodiments of Formulas I, I-a, I-b, II, II-a, II-b, II-c, III, III-a, III-b, III-d, III-e, IV, IV-a, IV-b, V, V-a, and V-b, each R′ is independently —C1-C6alkyl, —C3-C12cycloalkyl, or 3- to 14-membered heterocyclyl containing 1-4 heteroatoms independently selected from the group consisting of O, N, and S. In some embodiments, each R′ is independently —C1-C6alkyl (e.g., methyl).
Another aspect of the present disclosure is a compound selected from Table 1, or a pharmaceutically acceptable salt thereof.
It will be appreciated that throughout the present disclosure, unless otherwise indicated, reference to a compound of Formula I is intended to also include I, I-a, I-b, II, II-a, II-b, II-c, III, III-a, III-b, III-e, IV, IV-a, IV-b, V, V-a, and V-b, and compound species of such formulas disclosed herein.
Unless otherwise stated, it will be appreciated that when “one or more” substituents are recited for a particular variable, it includes one, two, three, four, or more substituents as valency permits.
In some embodiments of any Formula disclosed herein, a heterocyclyl at the R1, R2, R1′, R2′, or B position does not contain an O in the γ-position relative to C(═Z1) or C(═O). In some embodiments of any Formula disclosed herein, a heterocyclyl at the R1, R2, R1′, R2′, or B position contains 1-4 heteroatoms independently selected from the group consisting of N and S. In some embodiments of any Formula disclosed herein, when Re is —OR, —OR does not result in an O in the γ-position relative to C(═Z1),
Unless otherwise stated, structures depicted herein are also meant to include all stereoisomeric (e.g., enantiomeric or diastereomeric) forms of the structure, as well as all geometric or conformational isomeric forms of the structure; for example, the R and S configurations for each stereocenter. Therefore, single stereochemical isomers, as well as enantiomeric, diastereomeric, and geometric (or conformational) mixtures of the present compounds are within the scope of the disclosure. For example, in some cases Table 1 shows one or more stereoisomers of a compound, and unless otherwise indicated, represents each stereoisomer alone and/or as a mixture. Unless otherwise stated, all tautomeric forms of the compounds of the disclosure are within the scope of the disclosure.
In some embodiments, a compound of Formula I is obtained by a process comprising a purification method in Table 21. In some embodiments, the compound is obtained by a process comprising a purification method in Table 21 and is the 1st eluting isomer of the purification method. In some embodiments, the compound is obtained by a process comprising a purification method in Table 21 and is the 2nd eluting isomer of the purification method. In some embodiments, the compound is obtained by a process comprising a purification method in Table 21 and is the 3rd eluting isomer of the purification method. In some embodiments, the compound is obtained by a process comprising a purification method in Table 21 and is the 4th eluting isomer of the purification method. In some embodiments, the compound is obtained by a process comprising a purification method in Table 21 and is the 5th, 6th, 7th or 8th eluting isomer of the purification method.
In some embodiments, a USP9X Inhibitor is obtained by a process comprising a purification method in Table 21. In some embodiments, the USP9X Inhibitor is obtained by a process comprising a purification method in Table 21 and is the 1st eluting isomer of the purification method. In some embodiments, the USP9X Inhibitor is obtained by a process comprising a purification method in Table 21 and is the 2nd eluting isomer of the purification method. In some embodiments, the USP9X Inhibitor is obtained by a process comprising a purification method in Table 21 and is the 3rd eluting isomer of the purification method. In some embodiments, the USP9X Inhibitor is obtained by a process comprising a purification method in Table 21 and is the 4th eluting isomer of the purification method. In some embodiments, the USP9X Inhibitor is obtained by a process comprising a purification method in Table 21 and is the 5th, 6th, 7th or 8th eluting isomer of the purification method.
Additionally, unless otherwise stated, structures depicted herein are also meant to include compounds that differ only in the presence of one or more isotopically enriched atoms. For example, compounds having the present structures including the replacement of hydrogen by deuterium or tritium (e.g., Examples 103-44, 103-45, 103-46, and 103-47), or the replacement of a carbon by a 13C- or 14C-enriched carbon are within the scope of this disclosure.
In some embodiments, prodrugs of the compounds disclosed herein are provided. As used herein, the term “prodrug” refers to a compound that is a drug precursor which, following administration, releases the drug in vivo via a chemical or physiological process (e.g., a prodrug releases the drug upon reaching physiological pH or through enzyme action is converted to the desired drug form). Prodrugs can be obtained by including a group on the compound to increase solubility or bioabsorption (e.g., a phosphate group). In one example, the prodrug group is a phosphate group, which can be attached to a compound of Formula I at R1, when R2 is H, wherein upon administration, the prodrug is metabolized to form a compound of Formula I. In some embodiments, a compound of Formula I is formed as a metabolite of a prodrug.
The disclosure also provides compounds of Formula I (e.g., compounds that are not USP9X Inhibitors) that are useful, for example, as analytical tools and/or control compounds in biological assays.
The compounds of Formula I may form salts which are also within the scope of this disclosure. Reference to a compound of the Formula I herein is understood to include reference to salts thereof, unless otherwise indicated. Pharmaceutically acceptable salts are well known in the art. For example, S. M. Berge, et al. describes pharmaceutically acceptable salts in detail in J. Pharmaceutical Sciences, 66: 1-19 (1977).
The disclosure also includes pharmaceutical compositions comprising one or more compounds as described herein, or a pharmaceutically acceptable salt thereof, and a pharmaceutically acceptable excipient. In some embodiments, pharmaceutical compositions reported herein can be provided in a unit dosage form (e.g., capsule, tablet or the like). In some embodiments, pharmaceutical compositions reported herein can be provided in an oral dosage form. In some embodiments, the pharmaceutical composition is orally administered in any orally acceptable dosage form. In some embodiments, an oral dosage form of a compound of Formula I can be a capsule. In some embodiments, an oral dosage form of a compound of Formula I is a tablet. In some embodiments, an oral dosage form comprises one or more fillers, disintigrants, lubricants, glidants, anti-adherents and/or anti-statics. In some embodiments, an oral dosage form is prepared via dry blending. In some embodiments, an oral dosage form is a tablet and is prepared via dry granulation.
The designations “α”, “β”, “γ”, “δ”, “ε”, etc. are used herein to refer to a position in a molecule relative to a carbonyl group, in accordance with standard nomenclature. For example, a carbon in the α-position (or an α-carbon) is a carbon atom in the position adjacent to a carbonyl group; and an oxygen in the β-position (or a β-oxygen) is an oxygen atom in the position two atoms away from a carbonyl group. The scheme below illustrates this nomenclature on an exemplary compound:
Another aspect of the present disclosure is the use of compounds of Formula I. Compounds of Formula I are useful in medicine. For example, compounds and compositions described herein are inhibitors of USP9X. Methods of treatment (e.g., by inhibiting USP9X) can comprise administering to a subject in need thereof a therapeutically effective amount of (i) a compound disclosed herein, or a pharmaceutically acceptable salt thereof or (ii) a pharmaceutical composition comprising a compound disclosed herein, or a pharmaceutically acceptable salt thereof, and a pharmaceutically acceptable carrier. In some embodiments, a method of treating a disease associated with modulation of USP9X comprises administering a therapeutically effective amount of a compound disclosed herein. In some embodiments, a method of treating cancer comprises administering a therapeutically effective amount of a compound disclosed herein.
The compounds of the present disclosure may be made by a variety of methods, including standard chemistry. Suitable synthetic routes are depicted in the Schemes given below.
Unless otherwise noted, reagents and solvents were used as received from commercial suppliers. Unless otherwise noted, reactions were conducted under an inert atmosphere of nitrogen. NMR instrument: Bruker BBFO ASCEND™ 400 AVANCE III 400 MHz and Bruker BBFO ULTRASHIELD™ 300 AVANCE III 300 MHz. Internal standard: Tetramethylsilane (TMS). MassSpec instruments and ionization method: Shimadzu LC-2020, electrospray ionization, ESI. Chromatography instruments (Reverse phase chromatography: Agela TechnologiesMP200. Preparatory HPLC (Prep-HPLC): Waters. Supercritical fluid chromatography (SFC): Shimadzu).
The assay was performed in a final volume of 6 μL assay buffer containing 20 mM Tris-HCl (pH 8.0, (1M Tris-HCl, pH 8.0 solution; Corning 46-031-CM)), L-Glutathione (GSH) reducing agent (1 mM, Sigma-Aldrich, G4251-100G), 0.03% Bovine Gamma Globulin (BGG) (0.22 μM filtered, Sigma, G7516-25G), and 0.01% Triton X-100 (Sigma, T9284-10L). DMSO solutions of the compounds in nanoliter quantities (10-point, 3-fold serial dilutions) were dispensed into 1536 assay plates (Corning, #3724BC) for final test concentrations of 25 μM to 1.3 nM, top to lowest dose, respectively. Concentration and incubation times were optimized for the maximal signal-to-background while maintaining initial velocity conditions at a fixed substrate concentration (<<Km). The final concentration of USP9X (Enzyme, E) was 0.025 nM, and the final concentration of Ubiquitin-Rhoadmine 110 (Ub-Rh110, UbiQ-126) (Substrate, S) was 25 nM. To assay plates (pre-stamped with compound) was added 3 μL 2× Enzyme. The enzyme was preincubated for 30 minutes and then treated with 3 μL of 2× Substrate. Plates were incubated for 11 min (continuous kinetic read) at room temperature before the fluorescence was read on the Envision plate reader (Perkin Elmer) or PheraSTAR plate reader (BMG), with excitation at 485 nm and emission at 535 nm. The slope (best fit linear regression) of the five reads was used to normalize for inhibition. For all assays, data are reported as percent inhibition compared with control wells based on the following equation: % inh=100*((FLU−AveLow)/(AveHigh−AveLow)), wherein FLU is measured Fluorescence, AveLow is average Fluorescence of no enzyme control (n=64), and AveHigh is average Fluorescence of DMSO control (n=64). IC50 values are determined by curve fitting of the standard 4 parameter logistic fitting algorithm included in the Activity Base software package: IDBS XE Designer Model205. Data are fitted using the Levenburg Marquardt algorithm.
As set forth in Tables 22 and 23, IC50 values are defined as follows: ≤25 μM and >2 μM (+); ≤2 μM and >0.2 μM (++); ≤0.2 μM and >0.05 μM (+++); ≤0.05 μM and >0.001 μM (++++); and not tested (−−).
To a solution of 1,4-dimethyl (2Z)-but-2-enedioate (7.4 g, 51.3 mmol) in tetrahydrofuran (1 L) was added tosylmethyl isocyanide (10 g, 51.5 mmol) followed by the addition of t-BuOK (11.6 g, 103 mmol) in portions with stirring at 0° C. The resulting mixture was stirred for 2 h at room temperature. The reaction mixture was poured into brine (500 mL) and then extracted with ethyl acetate (2×250 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The solids were treated with ethyl acetate, filtered and dried under vacuum to afford 3,4-dimethyl 1H-pyrrole-3,4-dicarboxylate as a tan solid (5.5 g, 58%). LCMS (ES, m/z) 184 [M+H]+.
To a solution of 3,4-dimethyl 1H-pyrrole-3,4-dicarboxylate (5.5 g, 30 mmol) in DMF (100 mL) was added sodium hydride (1.1 g, 45.1 mmol, 60% dispersion in mineral oil) in portions with stirring at 0° C. The resulting solution was stirred for 0.5 h at room temperature. A solution of 4-toluene sulfonyl chloride (6.9 g, 36.2 mmol) in DMF (10 mL) was added slowly at 0° C. and the resulting mixture was stirred for 2 h at room temperature. The reaction mixture was poured into saturated ammonium chloride solution (50 mL) and then extracted with ethyl acetate (3×200 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 33:66 ethyl acetate/petroleum ether) to afford 3,4-dimethyl 1-(4-methylbenzenesulfonyl)-1H-pyrrole-3,4-dicarboxylate as a white solid (4.0 g, 39%). LCMS (ES, m/z) 338 [M+H]+.
To a solution of 3,4-dimethyl 1-(4-methylbenzenesulfonyl)-1H-pyrrole-3,4-dicarboxylate (4.0 g, 11.9 mmol) in tetrahydrofuran (50 mL) was added lithium aluminum hydride (900 mg, 23.7 mmol) in portions with stirring at 0° C. The resulting solution was stirred for 2 h at room temperature. The reaction was quenched by careful addition of sodium sulfate 10H2O. The resulting mixture was filtered and concentrated under vacuum and purified by silica gel chromatography (eluting with 0:100 to 33:66 ethyl acetate/petroleum ether) to afford [4-(hydroxymethyl)-1-(4-methylbenzenesulfonyl)-1H-pyrrol-3-yl]methanol as a dark red solid (2.5 g, 75%). LCMS (ES, m/z) 264 [M+H—H2O]+.
To a solution of [4-(hydroxymethyl)-1-(4-methylbenzenesulfonyl)-1H-pyrrol-3-yl]methanol (2.5 g, 8.89 mmol) in dichloromethane (30 mL) was added tribromophosphane (4.8 g, 17.7 mmol) dropwise with stirring at 0° C. The resulting mixture was stirred for 2 h at room temperature. The reaction mixture was poured into saturated aqueous sodium bicarbonate (30 mL) and then extracted with ethyl acetate (3×50 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 20:80 ethyl acetate/petroleum ether) to afford 3,4-bis(bromomethyl)-1-(4-methylbenzenesulfonyl)-1H-pyrrole as a dark red solid (1.9 g, 53%). LCMS (ES, m/z) 408, 406, 410 [M+H]+.
To a solution of tert-butyl carbamate (0.8 g, 6.8 mmol) in DMF (20 mL) was added sodium hydride (0.4 g, 10.0 mmol, 60% dispersion in mineral oil) in portions with stirring at 0° C. The resulting solution was stirred for 0.5 h at room temperature. 3,4-bis(bromomethyl)-1-(4-methylbenzenesulfonyl)-1H-pyrrole (1.8 g, 4.42 mmol) was added and the resulting mixture was stirred for 2 h at room temperature. The solution was poured into water (20 mL). The solids were collected by filtration and dried under vacuum to afford 3,4-bis(bromomethyl)-1-(4-methylbenzenesulfonyl)-1H-pyrrole as a yellow solid (1.4 g, 69%). LCMS (ES, m/z) 348 [M+H—CH3]+.
To a solution of 3,4-bis(bromomethyl)-1-(4-methylbenzenesulfonyl)-1H-pyrrole (700 mg, 1.93 mmol) in methanol (15 mL) was added sodium hydroxide (1.2 g, 30.0 mmol). The resulting solution was stirred for 3 h at 65° C. and then cooled to room temperature. The reaction mixture was poured into water (20 mL) and then extracted with ethyl acetate (3×30 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered and concentrated under vacuum to afford tert-butyl 1H,2H,3H,5H-pyrrolo[3,4-c]pyrrole-2-carboxylate as yellow solid (300 mg, crude). LCMS (ES, m/z) 153 [M+H-t-Bu]+.
To a solution of tert-butyl 1H,2H,3H,5H-pyrrolo[3,4-c]pyrrole-2-carboxylate (250 mg, 1.20 mmol) in dichloromethane (3 mL) was added sodium hydroxide (61 mg, 1.53 mmol) and Bu4NHSO4 (41 mg, 0.12 mmol). A solution of 2,3-dihydro-1, 4-benzodioxine-6-sulfonyl chloride (340 mg, 1.20 mmol) in dichloromethane (3 mL) was added dropwise with stirring at 0° C. The resulting mixture was stirred for 3 h at room temperature. The reaction mixture was poured into saturated ammonium chloride (5 mL) and then extracted with ethyl acetate (3×20 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered and concentrated under vacuum. The resulting crude product was purified by Prep-TLC (eluting with 3:1 ethyl acetate/petroleum ether) to afford tert-butyl 5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,5H-pyrrolo[3,4-c]pyrrole-2-carboxylate as brown oil (200 mg, 49%). LCMS (ES, m/z) 392 [M+H—CH3]+.
To a solution of tert-butyl 5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,5H-pyrrolo[3,4-c]pyrrole-2-carboxylate (200 mg, 0.49 mmol) in dichloromethane (3 mL) was added TFA (0.6 mL). The resulting solution was stirred for 1 h at room temperature. The resulting mixture was concentrated under vacuum to afford 5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,5H-pyrrolo[3,4-c]pyrrole TFA salt as yellow oil (190 mg, crude). LCMS (ES, m/z) 307 [M+H]+.
To a solution of 2,3-dimethylbut-2-ene (1000 g, 11.9 mol) in DCM (1000 mL) in a 4 L 4-necked round bottom flask was added aqueous hydrogen bromide solution (150 mL, 48%) with stirring at 10-15° C. To the reaction was added bromine (9.90 kg, 62.0 mol) with stirring at 0° C. The resulting mixture was stirred for 2 days at 45° C. in an oil bath. After cooling to room temperature, the reaction mixture was carefully poured into saturated aqueous sodium hydrogen sulfite solution (10 L). The precipitate was collected by filtration and dried in oven to afford 1,4-dibromo-2,3-bis(bromomethyl)but-2-ene as a light yellow solid (3000 g, 44%). GCMS: (EI, m/z): 398, 400, 402 [M]+.
To a solution of 1,4-dibromo-2,3-bis(bromomethyl)but-2-ene (2000 g, 3.50 mol) in DMF (20 L) was added 4-methylbenzene-1-sulfonamide (2137 g, 12.5 mol), and potassium carbonate (5175 g, 37.4 mol). The resulting mixture was stirred for 2 days at room temperature. The reaction mixture was slowly poured into water/ice (20 L). The precipitate was collected by filtration, washed with ethanol and dried in an oven to afford 2,5-ditosyl-1,2,3,4,5,6-hexahydropyrrolo[3,4-c]pyrrole as a light yellow solid (1345 g, 78%). LCMS: (ES, m/z): 419 [M+H]+.
To a solution of 2,5-ditosyl-1,2,3,4,5,6-hexahydropyrrolo[3,4-c]pyrrole (1345 g, 2.73 mol) in aqueous hydrogen bromide solution (4500 mL, 48%) in 10 L 4-necked round-bottom flask, was added phenol (1270 g, 13.5 mol). The resulting mixture was stirred for 2 days at 120° C. After cooling to room temperature, the aqueous layer was collected and concentrated under vacuum. The resulting solids were washed with DCM/MeOH (v:v=10:1, 3×300 mL) and dried in an oven to afford 1,2,3,4,5,6-hexahydropyrrolo[3,4-c]pyrrole hydrogen bromide salt as a yellow solid (480 g, 61%). LCMS: (ES, m/z): 111 [M+H]+.
To a suspension of 1,2,3,4,5,6-hexahydropyrrolo[3,4-c]pyrrole hydrogen bromide salt (458 g, 1.52 mol) in water (4 L) was added sodium bicarbonate (424 g, 5.05 mol) followed by dropwise addition of a solution of di-tert-butyl dicarbonate (807 g, 3.70 mol) in methanol (500 mL) with stirring at 0° C. The resulting solution was stirred for 16 h at 25° C. The precipitate was collected by filtration and dried in an oven to afford di-tert-butyl pyrrolo[3,4-c]pyrrole-2,5(1H,3H,4H,6H)-dicarboxylate as a white solid (300 g, 61%). LCMS (ES, m/z): 311[M+H]+.
To a solution of di-tert-butyl pyrrolo[3,4-c]pyrrole-2,5(1H,3H,4H,6H)-dicarboxylate (200 g, 612 mmol) in propan-2-yl acetate (5 L) was added 4-methylbenzene-1-sulfonic acid (123 g, 647 mmol) in portions at 0° C. The resulting mixture was stirred for 16 h at 55° C. in an oil bath. After cooling to room temperature, the precipitate was collected by filtration and dried in an oven to afford tert-butyl 4,5-dihydropyrrolo[3,4-c]pyrrole-2(1H,3H,4H)-carboxylate 4-methylbenzene-1-sulfonic acid salt as a yellow solid (197 g, 80%). LCMS: (ES, m/z): 211[M+H]+.
To a suspension of tert-butyl 4,5-dihydropyrrolo[3,4-c]pyrrole-2(1H,3H,4H)-carboxylate 4-methylbenzene-1-sulfonic acid salt (61 g, 142 mmol) in water (100 mL) and tetrahydrofuran (30 mL) was added sodium hydroxide (13 g, 325 mmol) followed by portion-wise addition of 2,3-dihydro-1,4-benzodioxine-6-sulfonyl chloride (25 g, 95.9 mmol) at 0° C. The resulting mixture was stirred for 2 h at 25° C. The product was extracted with ethyl acetate (3×200 mL). The organic layers were combined, dried over anhydrous sodium sulfate, filtered and concentrated under vacuum. The resulting material was purified by silica gel chromatography (eluting with 1:10 ethyl acetate/petroleum ether) to afford tert-butyl 5-(2,3-dihydrobenzo[b][1,4]dioxin-6-ylsulfonyl)-4,5-dihydropyrrolo[3,4-c]pyrrole-2(1H,3H,4H)-carboxylate as a white solid (30 g, 73%). LCMS: (ES, m/z): 409 [M+H]+.
To a solution of tert-butyl 5-(2,3-dihydrobenzo[b][1,4]dioxin-6-ylsulfonyl)-4,5-dihydropyrrolo[3,4-c]pyrrole-2(1H,3H,4H)-carboxylate (30.0 g, 69.8 mmol) in 1,4-dioxane (100 mL) was added hydrochloric acid (200 mL, 4 M in 1,4-dioxane). The resulting solution was stirred for 2 h at 25° C. and then concentrated under vacuum to afford 2-(2,3-dihydrobenzo[b][1,4]dioxin-6-ylsulfonyl)-1,2,3,4,5,6-hexahydropyrrolo[3,4-c]pyrrole hydrochloric salt as a yellow solid (20 g, 79%). LCMS: (ES, m/z): 309 [M+H]+.
To a solution of methyl 2-(3-cyclopropyl-4-methoxyphenyl) acetate (840 mg, 3.82 mmol) in N,N-dimethylformamide (25 mL) was added paraformaldehyde (388 mg, 4.31 mmol), tetrabutylazanium iodide (133 mg, 0.36 mmol), and potassium carbonate (1.25 g, 9.0 mmol). The resulting solution was stirred for 10 min at 60° C. and then cooled to room temperature. The reaction mixture was poured into water (50 mL) and extracted with ethyl acetate (3×80 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 4:96 ethyl acetate/petroleum ether) to afford methyl 2-(3-cyclopropyl-4-methoxyphenyl)prop-2-enoate as yellow oil (300 mg, 34%). LCMS (ES, m/z) 233 [M+H]+.
To a solution of methyl 2-(3-bromo-4-methoxyphenyl)acetate (5.00 g, 22 mmol) in toluene (30 mL) was added SOCl2 (30 mL). The resulting mixture was stirred for 3 h at 100° C. and then cooled to room temperature. The mixture was concentrated under vacuum, and then dissolved in tetrahydrofuran (30 mL). To the solution was added a solution of trimethylsilyldiazomethane (18.4 mL, 2 M in hexane) and triethylamine (5.1 mL, 0.037 mol). The resulting solution was stirred for 10 h at room temperature. The reaction mixture was poured into saturated sodium bicarbonate solution (10 mL), and extracted with ethyl acetate (3×50 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The residue was dissolved in methanol (200 mL) and then silver benzoate (3.00 g, 0.013 mol) and triethylamine (30 mL) were added. The resulting mixture was stirred for 10 h at room temperature and concentrated under vacuum. The material was purified by silica gel chromatography (eluting with 0:100 to 10:90 ethyl acetate/petroleum ether) to afford methyl 2-(3-bromo-4-methoxyphenyl) acetate as a yellow oil (2.00 g, 36%). LCMS (ES, m/z) 259, 261 [M+H]+.
To a solution of methyl 2-(3-bromo-4-methoxyphenyl) acetate (1.60 g, 0.78 mmol) in 1,4-dioxane (10 mL), water (1 ml) was added cyclopropylboronic acid (0.20 g, 1.20 mmol), potassium phosphate (986 mg, 2.30 mmol), and Pd(dppf)Cl2 (56 mg, 0.039 mmol). The resulting mixture was stirred for 3 h at 90° C. and then cooled to room temperature. The reaction mixture was poured into water (10 mL) and extracted with ethyl acetate (3×20 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 10:90 ethyl acetate/petroleum ether) to afford methyl 2-(3-cyclopropyl-4-methoxyphenyl) acetate as a light yellow oil (840 mg, 62%). LCMS (ES, m/z) 221 [M+H]+.
To a solution of 4-bromo-2-methyl-1,3-benzothiazole (3.00 g, 12.9 mmol) in 1,4-dioxane (20 mL) was added 4,4,5,5-tetramethyl-2-(tetramethyl-1,3,2-dioxaborolan-2-yl)-1,3,2-dioxaborolane (4.01 g, 15.5 mmol), Pd(dppf)Cl2 (960 mg, 1.29 mmol) and potassium acetate (2.58 g, 25.8 mmol). The resulting mixture was stirred for 16 h at 100° C. and then cooled to room temperature. The reaction mixture was poured into water (30 mL) and then extracted with ethyl acetate (3×30 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 20:80 ethyl acetate/petroleum ether) to afford 2-methyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1,3-benzothiazole as a light yellow oil (2.00 g, 46%). LCMS (ES, m/z) 276 [M+H]+.
To a solution of 2-methyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1,3-benzothiazole (600 mg, 1.86 mmol) in 1,4-dioxane (10 mL) was added methyl 2-bromoprop-2-enoate (447 mg, 2.66 mmol), XPhos 3G (80 mg, 0.11 mmol), potassium phosphate (1.4 g, 6.46 mmol) and water (1 mL). The resulting mixture was stirred for 16 h at 100° C. and then cooled to room temperature. The reaction mixture was poured into water (10 mL) and then extracted with ethyl acetate (3×30 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 20:80 ethyl acetate/petroleum ether) to afford methyl 2-(2-methyl-1,3-benzothiazol-4-yl)prop-2-enoate as light yellow oil (280 mg, 55%). LCMS (ES, m/z) 234 [M+H]+.
The Intermediates in Table 2 were synthesized according to the procedure described for Intermediate 2-4 above.
In a 250 mL round-bottom flask was placed methyl 2-(3-methoxyphenyl)acetate (5 g, 27.2 mmol), paraformaldehyde (3 g, 33.3 mmol), n-Bu4NI (1 g, 2.7 mmol), potassium carbonate (9.6 g, 69.5 mmol) and N,N-dimethylformamide (60 mL). The resulting solution was stirred for 10 min at 60° C. in an oil bath. After cooling to room temperature, the solution was diluted with 100 mL of water and extracted with ethyl acetate (3×100 mL). The organic layers were combined, dried over anhydrous sodium sulfate, filtered and concentrated under vacuum to afford 3 g (570%) of methyl 2-(3-methoxyphenyl)prop-2-enoate as a yellow oil. MS: (ESI, m/z): 193[M+H]+.
The Intermediates in Table 3 were synthesized according to the procedure described for Intermediate 3-1 above.
To a solution of 2-(3-chlorophenyl)acetonitrile (2.0 g, 12.5 mmol) in toluene (20 mL) was added sodium hydride (602 mg, 15.1 mmol, 60% dispersion in mineral oil) at 0° C. The resulting solution was stirred for 1 h at 0° C. followed by addition of diethyl carbonate (12.5 g, 100 mmol). The resulting mixture was stirred for 2 h at 80° C. and then cooled to room temperature. The reaction mixture was poured into aqueous ammonium chloride solution (20 mL) and then extracted with ethyl acetate (3×50 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 10:90 ethyl acetate/petroleum ether) to afford ethyl 2-(3-chlorophenyl)-2-cyanoacetate as a yellow oil (1.50 g, 54%). LCMS (ES, m/z) 224, 226 [M+H]+.
To a solution of Selectfluor (1.90 g, 5.10 mmol) in MeCN (30 mL) was added (DHQD)2PHAL (5.29 g, 6.80 mmol) and 3 Å molecular sieves (5 g). The resulting mixture was stirred for 1 h at room temperature and then cooled to −80° C. followed by slow addition of a solution of ethyl 2-(3-chlorophenyl)-2-cyanoacetate (800 mg, 3.40 mmol) in dichloromethane (40 mL) with stirring. After 6 h at −80° C., the reaction mixture was poured into water (20 mL) and then extracted with ethyl acetate (3×20 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 10:90 ethyl acetate/petroleum ether) to afford ethyl (2S)-2-(3-chlorophenyl)-2-cyano-2-fluoroacetate as a yellow oil (600 mg, 73%). LCMS (ES, m/z) 242, 244 [M+H]+.
To a solution of ethyl (2S)-2-(3-chlorophenyl)-2-cyano-2-fluoroacetate (600 mg, 2.36 mmol) in ethanol (10 mL) was added Raney Ni (404 mg, 4.72 mmol) and Boc2O (1.03 g, 4.72 mmol). Hydrogen was introduced with a balloon. The resulting mixture was stirred for 12 h at room temperature. The solids were filtered and the filtrate was concentrated under vacuum. The resulting crude product was purified by Prep-HPLC (Column: XBridge Shield RP18 OBD Column, 5 μm, 19×150 mm; Mobile Phase, A: water (containing 10 mmol/L NH4HCO3) and B: CH3CN (17% to 51% over 6.33 min); Flow rate: 60 mL/min; Detector: UV 254 nm). The fractions were concentrated to afford ethyl (2S)-3-[[(tert-butoxy)carbonyl]amino]-2-(3-chlorophenyl)-2-fluoropropanoate as colorless oil (200 mg, 25%). LCMS (ES, m/z) 290, 292 [M+H-t-Bu]+.
To a solution of ethyl (2S)-3-[[(tert-butoxy)carbonyl]amino]-2-(3-chlorophenyl)-2-fluoropropanoate (200 mg, 0.55 mmol) in tetrahydrofuran (2 mL) and water (2 mL) was added LiOH (66 mg, 2.76 mmol). The resulting mixture was stirred for 16 h at room temperature. The reaction mixture was washed with diethyl ether (1×10 mL) and then acidified to pH=5 with saturated aqueous citric acid. The product was extracted with ethyl acetate (3×20 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum to afford (2S)-3-[[(tert-butoxy)carbonyl]amino]-2-(3-chlorophenyl)-2-fluoropropanoic acid as a yellow oil (120 mg, 69%). LCMS (ES, m/z) 262, 264 [M+H-t-Bu]+.
To a solution of 2-bromo-4-chloro-5-methylphenol (2.0 g, 8.1 mmol) in acetone (20 mL) was added potassium carbonate (2.5 g, 16 mmol), and iodomethane (0.66 mL, 9.5 mmol). The resulting mixture was stirred for 2 h at 25° C. The reaction mixture was poured into water (30 mL) and then extracted with ethyl acetate (3×30 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 20:80 ethyl acetate/petroleum ether) to afford 1-bromo-5-chloro-2-methoxy-4-methylbenzene as a light yellow oil (1.87 g, 82%). GCMS (EI, m/z): 234, 236 [M]+.
The Intermediates in Table 4 were synthesized according to the procedure described for Intermediate 5-1 above.
To a solution of 1-bromo-4-fluoro-2,3-dimethylbenzene (5.0 g, 23 mmol) in CCl4 (75 mL), was added NBS (11 g, 59 mmol) and BPO (126 mg, 0.47 mmol). The resulting solution was stirred for 16 h at 85° C. and then cooled to room temperature. The reaction mixture was filtered and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 1:100 ethyl acetate/petroleum ether) to afford 1-bromo-2,3-bis(bromomethyl)-4-fluorobenzene as a light yellow oil (7.0 g, 78%).
To a solution of 1-bromo-2,3-bis(bromomethyl)-4-fluorobenzene (3.0 g, 8.3 mmol) in MeCN (300 mL) was added 1-phenylmethanamine (900 mg, 8.3 mmol) and potassium bicarbonate (2.08 g, 20.8 mmol). The resulting mixture was stirred for 8 h at 85° C. and then cooled to room temperature. The reaction mixture was filtered and concentrated under vacuum. The crude product was purified by silica gel chromatography (eluting with 1:10 ethyl acetate/petroleum ether) to afford methyl 2-benzyl-4-bromo-7-fluoro-2,3-dihydro-1H-isoindole as a yellow oil (2 g, 78%). LCMS (ES, m/z) 306, 308 [M+H]+.
To a solution of methyl 2-benzyl-4-bromo-7-fluoro-2,3-dihydro-1H-isoindole (3 g, 8.3 mmol) in THF (30 mL) was added a solution of n-butyllithium (12 mL, 1.6 M in THF) dropwise with stirring at −78° C. After stirring for 10 min, diethyl oxalate (8.5 mL, 81 mmol) was added. The solution was stirred for 1 h at −60° C. The reaction mixture was poured into saturate ammonium chloride solution (20 mL) and extracted with ethyl acetate (3×50 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered and concentrated under vacuum. The crude material was purified by silica gel chromatography (eluting with 1:5 ethyl acetate/petroleum ether) to afford ethyl 2-(2-benzyl-7-fluoro-2,3-dihydro-1H-isoindol-4-yl)-2-oxoacetate as a yellow oil (1.15 g, 36%). LCMS (ES, m/z) 328 [M+H]+.
To a solution of 2-(2-benzyl-7-fluoro-2,3-dihydro-1H-isoindol-4-yl)-2-oxo acetate (1 g, 3.0 mmol) in 1,2-dichloroethane (10 mL) was added 1-chloroethyl carbonochloridate (396 mg, 2.8 mmol). The resulting solution was stirred for 2 h at 85° C. and cooled to room temperature. The solution was concentrated under vacuum and dissolved in MeOH (10 mL). After stirring for 1 h at 85° C., the reaction was cooled to room temperature. The resulting mixture was concentrated and dissolved in water (10 mL). The resulting solution was washed with EtOAc (1×10 mL). The aqueous layer was rendered basic (pH=10) with sodium hydroxide solution (1 N). To this solution was added Boc2O (642 mg, 2.8 mmol). The resulting solution was stirred for 4 h at rt and then extracted with ethyl acetate (2×10 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered and concentrated under vacuum. The crude product was purified by silica gel chromatography (eluting with 2:1 ethyl acetate/petroleum ether) to afford 2-{2-[(tert-butoxy)carbonyl]-7-fluoro-2,3-dihydro-1H-isoindol-4-yl}-2-oxoacetic acid as a yellow solid (300 mg, 32%). LCMS (ES, m/z) 310 [M+H]+.
To a solution of tert-buty 4-bromo-2,3-dihydro-1H-isoindole-2-carboxylate in (2.0 g, 6.4 mmol) in THF (20 mL) was added a solution of n-BuLi (2.6 mL, 2.5 M in THF) dropwise with stirring at −78° C. After stirring for 15 min at −78° C., diethyl oxalate (3.1 mL, 32 mmol) was added in. The resulting mixture was stirred for 1 h at −60° C. The reaction mixture was poured into saturated ammonium chloride solution (20 mL) and then extracted with ethyl acetate (3×20 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 20:80 ethyl acetate/petroleum ether) to afford tert-butyl 4-(2-ethoxy-2-oxoacetyl)-2,3-dihydro-1H-isoindole-2-carboxylate as a light yellow solid (1.12 g, 47%). LCMS (ES, m/z) 320 [M+H]+.
To a solution of tert-butyl 4-(2-ethoxy-2-oxoacetyl)-2,3-dihydro-1H-isoindole-2-carboxylate (1.12 g, 2.98 mmol) in tetrahydrofuran (6 mL) was added water (6 mL) and LiOH (421 mg, 16.70 mmol). The resulting mixture was stirred for 16 h at room temperature. The reaction mixture was washed with diethyl ether (1×10 mL) and then acidified to pH=5 with saturated citric acid. The resulting solution was extracted with ethyl acetate (2×10 mL). The combined organic layers were combined, dried over anhydrous sodium sulfate, filtered and concentrated under vacuum to afford 2-[2-[(tert-butoxy)carbonyl]-2,3-dihydro-1H-isoindol-4-yl]-2-oxoacetic acid as a light yellow solid (1.0 g, crude). LCMS (ES, m/z) 292 [M+H]+.
The Intermediates in Table 5 were synthesized according to the procedure described for Intermediate 7-1 above.
Into a 200 mL sealed tube purged and maintained with an inert atmosphere of nitrogen was added methyl 2-(3-hydroxyphenyl)acetate (5 g, 30.1 mmol), bromocyclopropane (20 g, 151 mmol), DMA (100 ml) and Cs2CO3 (30 g, 90.4 mmol). The resulting mixture was stirred for 48 h at 150° C. in an oil bath. After cooling to room temperature, the reaction mixture was treated with 100 mL of water and then extracted with ethyl acetate (3×100 mL). The organic layers were combined, dried over anhydrous sodium sulfate, filtered and concentrated under vacuum. The residue was purified by silica gel chromatography (eluting with 1:10 ethyl acetate/petroleum ether) to afford 1.5 g (22%) of methyl 2-(3-cyclopropoxyphenyl) acetate as a red oil. MS: (EI, m/z): 206[M]+.
Into a 250 mL 3-necked round-bottom flask purged and maintained with an inert atmosphere of nitrogen was added 8-bromoquinoline (5 g, 24.0 mmol), potassium 3-ethoxy-3-oxopropanoate (8.2 g, 48.2 mmol), BINAP (1.8 g, 2.9 mmol), 4-dimethylaminopyridine (295 mg, 2.4 mmol), Pd2(allyl)2Cl2 (352 mg, 0.96 mmol) and mesitylene (60 mL). The resulting mixture was stirred for 7 h at 140° C. After cooling to room temperature, the reaction mixture was treated with water (60 mL) and then extracted with ethyl acetate (3×100 mL). The organic layers were combined, washed with brine (80 mL), dried over anhydrous sodium sulfate, filtered and concentrated under vacuum. The residue was purified by silica gel chromatography (eluting with 7/3 ethyl acetate/petroleum ether) to afford 3 g (58%) of ethyl 2-(quinolin-8-yl) acetate as a brown oil. MS: (ESI, m/z): 216[M+H]+.
Into an 8 mL vial purged and maintained with an inert atmosphere of nitrogen was added tert-butyl 2-(3-bromophenyl)-3-(5-(2,3-dihydrobenzo[b][1,4]dioxin-6-ylsulfonyl)-4,5-dihydropyrrolo[3,4-c]pyrrol-2(1H,3H,4H)-yl)-3-oxopropyl(methyl)carbamate (120 mg, 0.18 mmol), Pd(dppf)Cl2.CH2Cl2 (15 mg, 0.02 mmol), potassium carbonate (51 mg, 0.37 mmol), THF (1 mL) and a solution of diethylzinc in THF (1.0 M, 0.3 mL, 0.3 mmol). The resulting solution was stirred overnight at 20° C. The resulting solution was poured into 10 mL of water and then extracted with ethyl acetate (3×10 mL). The organic layers were combined, dried over anhydrous sodium sulfate, filtered and concentrated under vacuum. The residue was purified by silica gel chromatography (eluting with 1:1 ethyl acetate/petroleum ether) to afford 40 mg (38%) of tert-butyl 3-(5-(2,3-dihydrobenzo[b][1,4]dioxin-6-ylsulfonyl)-4,5-dihydropyrrolo[3,4-c]pyrrol-2(1H,3H,4H)-yl)-2-(3-ethylphenyl)-3-oxopropyl(methyl)carbamate as a light yellow oil. MS: (ESI, m/z): 598 [M+H]+.
Into a 100 mL round-bottom flask was added 2-(3,5-dichlorophenyl)acetic acid (3 g, 14.6 mmol) and thionyl chloride (30 mL). The resulting solution was stirred for 1 h at 40° C. The reaction mixture was concentrated under vacuum and dissolved in 20 mL of methanol. The resulting solution was stirred for 10 min at 60° C. After cooling to room temperature, the reaction mixture was concentrated, treated with 10 mL of saturated sodium bicarbonate solution and then extracted with ethyl acetate (3×30 mL). The organic layers were combined, dried over anhydrous sodium sulfate, filtered and concentrated under vacuum to afford 2.6 g (73%) of methyl 2-(3,5-dichlorophenyl)acetate as a colorless oil. MS: (EI, m/z): 218, 220[M]+.
In a 8 mL vial purged and maintained with an inert atmosphere of nitrogen was added tert-butyl 2-(3-bromophenyl)-3-(5-(2,3-dihydrobenzo[b][1,4]dioxin-6-ylsulfonyl)-4,5-dihydropyrrolo[3,4-c]pyrrol-2(1H,3H,4H)-yl)-3-oxopropyl(methyl)carbamate (120 mg, 0.18 mmol), cyclopropylboronic acid (19 mg, 0.22 mmol), Cs2CO3 (121 mg, 0.37 mmol), 3rd Generation XPhos precatalyst (16 mg, 0.02 mmol), 1,4-dioxane (0.9 mL) and water (0.3 mL). The resulting mixture was stirred for 3 h at 80° C. in an oil bath. After cooling to room temperature, the resulting mixture was concentrated under vacuum. The residue was purified by silica gel chromatography (eluting with 1:1 ethyl acetate/petroleum ether) to afford 80 mg (75%) of tert-butyl 2-(3-cyclopropylphenyl)-3-(5-(2,3-dihydrobenzo[b][1,4]dioxin-6-ylsulfonyl)-4,5-dihydropyrrolo[3,4-c]pyrrol-2(1H,3H,4H)-yl)-3-oxopropyl(methyl)carbamate as a yellow oil. MS: (ESI, m/z): 610[M+H]+.
In a 50 mL round-bottom flask purged and maintained with an inert atmosphere of nitrogen was added (3-chloro-5-methoxyphenyl)boronic acid (500 mg, 2.6 mmol), methyl 2-bromoprop-2-enoate (440 mg, 2.6 mmol), 1,4-dioxane (0.9 mL), water (0.3 mL), Cs2CO3 (1.75 g, 5.37 mmol) and 3rd Generation XPhos precatalyst (225 mg, 0.27 mmol). The resulting mixture was stirred for 3 h at 100° C. in an oil bath. After cooling to room temperature, the reaction mixture was concentrated under vacuum. The residue was purified by silica gel chromatography (eluting with 1:5 ethyl acetate/petroleum ether) to afford 230 mg (39%) of methyl 2-(3-chloro-5-methoxyphenyl) acrylate as a yellow oil. MS: (ESI, m/z): 227[M+H]+.
The Intermediates in Table 6 were synthesized according to the procedure described for Intermediate 13-1 above.
To a solution of methyl 3-{[(tert-butoxy)carbonyl](methyl)amino}-2-(4-fluoro-2-methoxyphenyl)propanoate (180 mg, 0.53 mmol) in dichloromethane (3 mL) was added NCS (211 mg, 1.58 mmol). The resulting solution was stirred for 16 h at room temperature. The reaction mixture were filtered, and concentrated under vacuum. The resulting crude product was purified by prep-TLC (eluting with 1:5 ethyl acetate/petroleum ether) to afford methyl 3-{[(tert-butoxy)carbonyl](methyl)amino}-2-(3-chloro-4-fluoro-2-methoxyphenyl)propanoate as a light yellow oil (160 mg, 81%). LCMS (ES, m/z) 376, 378 [M+H]+.
To a solution of tert-butyl N-methylcarbamate (10 g, 0.72 mol) in tetrahydrofuran (200 mL) was added a solution of NaHMDS (44 mL, 2 M in THF) slowly with stirring at 0° C. After stirring for 30 min at this temperature, this was followed by addition of a solution of bromo(methoxy)methane (11.4 g, 0.91 mol) in tetrahydrofuran (10 mL) dropwise with stirring at 0° C. The resulting solution was allowed to warm to room temperature naturally and stirred for 16 h. The reaction mixture was treated with saturated ammonium chloride solution (200 mL) and then extracted with ethyl acetate (3×200 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 5:95 ethyl acetate/petroleum ether) to afford tert-butyl N-(methoxymethyl)-N-methylcarbamate as a yellow oil (12.5 g, 89%). 1H-NMR (CDCl3, 400 MHz) δ (ppm): 4.65 (s, 2H), 3.25 (s, 3H), 2.87 (s, 3H), 1.46 (s, 9H). LCMS (ES, m/z) 176 [M+H]+.
To a solution of 2-(3-chlorophenyl)acetic acid (23.2 g, 0.14 mol) in toluene (300 mL) was added (4S)-4-benzyl-1,3-oxazolidin-2-one (20 g, 0.11 mol) followed by the slow addition of TEA (46 g, 0.45 mol) with stirring at 15° C., and then slow addition of 2,2-dimethylpropanoyl chloride (17.4 g, 0.14 mol) with stirring at 30° C. The resulting mixture was stirred for 3 h at 110° C., and then cooled to room temperature. The mixture was concentrated under vacuum and the resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 5:95 ethyl acetate/petroleum ether) to afford (4S)-4-benzyl-3-[2-(3-chlorophenyl)acetyl]-1,3-Oxazolidin-2-one as a yellow solid (18 g, 40%). 1H-NMR (CDCl3, 400 MHz) δ (ppm): 7.43-7.12 (m, 9H), 4.76-4.64 (m, 1H), 4.41-4.15 (m, 4H), 3.35-3.23 (m, 1H), 2.87-2.74 (m, 1H). LCMS (ES, m/z) 330, 332 [M+H]+.
To a solution of (4S)-4-benzyl-3-[2-(3-chlorophenyl)acetyl]-1,3-oxazolidin-2-one (15 g, 0.41 mol) in dichloromethane (180 mL) was added a solution of titanium(IV) chloride (48.4 mL, 1 M in DCM) dropwise with stirring at −20° C. After stirring for 2 h at −20° C., a solution of DIEA (5.1 mL, 0.31 mol) in DCM (10 mL) was added slowly with stirring. After 1.5 h at −20° C., tert-butyl N-(methoxymethyl)-N-methylcarbamate (10.4 g, 0.59 mol) in dichloromethane (10 mL) was added dropwise. The reaction mixture was stirred for 2 h at −20° C. and then treated with saturate ammonium chloride solution (100 mL). The product was extracted with ethyl acetate (3×300 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum to afford tert-butyl N-[(2R)-3-[(4S)-4-benzyl-2-oxo-1,3-oxazolidin-3-yl]-2-(3-chlorophenyl)-3-oxopropyl]-N-methylcarbamate as a yellow solid (18 g, 84%).
To a solution of lithium hydroxide (2.3 g, 0.09 mol) in water (125 mL) was added THF (170 mL) followed by the sequential addition of a solution of hydrogen peroxide (9.2 mL, 30% in water) and a solution of tert-butyl N-[(2R)-3-[(4S)-4-benzyl-2-oxo-1,3-oxazolidin-3-yl]-2-(3-chlorophenyl)-3-oxopropyl]-N-methylcarbamate (18 g, 0.04 mol) in tetrahydrofuran (10 mL) dropwise with stirring at 0° C. The resulting mixture was stirred for 3 h at 0° C. The reaction was carefully quenched with aqueous sodium sulfite solution (100 mL, 12.5 wt %) while maintaining reaction temperature <10° C. After stirring for 30 min at room temperature, the mixture (pH=14) was concentrated to remove organic solvent and then washed with diethyl ether (3×200 mL). The aqueous layer was then acidified to pH=2-3 with aqueous potassium bisulfate solution (27 wt %) while maintaining temperature <15° C. The resulting solution was extracted with ethyl acetate (3×300 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered and concentrated under vacuum to afford (2R)-3-{[(tert-butoxy)carbonyl](methyl)amino}-2-(3-chlorophenyl)propanoic acid as a yellow oil (10 g, 84%). Note: the material contains about 20 wt % of (4S)-4-benzyl-1,3-oxazolidin-2-one based on HNMR determination, and its ee value is about 96%.
The crude material (4.5 g) was dissolved in MeCN (5 mL) and N-cyclohexylcyclohexanamine (3 g, 16.5 mmol) was added. The reaction was heated to 60° C. for 3 h and cooled to room temperature slowly over 16 h without stirring. The solids were collected by filtration and dried under vacuum to afford N-cyclohexylcyclohexanamine (2R)-3-{[(tert-butoxy)carbonyl](methyl)amino}-2-(3-chlorophenyl) propanoic acid complex as a white solid (5 g). The complex was then dissolved with aqueous solution of KHSO4 (50 mL, 27 wt %) and EtOAc (50 mL). The resulting solution was stirred for 1.5 h at rt and extracted with EtOAc (3×50 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered and concentrated under vacuum to afford pure (2R)-3-{[(tert-butoxy)carbonyl](methyl)amino}-2-(3-chlorophenyl)propanoic acid as a white solid (2.30 g, 99% purity, >99% ee). 1H-NMR (DMSO-d6, 400 MHz) δ (ppm): 7.43-7.21 (m, 4H), 4.07-3.90 (m, 1H), 3.94-3.89 (m, 2H), 2.84-2.70 (m, 3H), 1.39 (s, 9H). LCMS (ES, m/z) 314, 316 [M+H]+.
To a solution of 2-fluoro-4-methoxy-1-methylbenzene (8.00 g, 57.1 mmol) in MeCN (60 mL) was added NBS (11.2 g, 62.8 mmol). The resulting mixture was stirred for 3 h at room temperature. The reaction mixture was poured into water (40 mL) and then extracted with ethyl acetate (3×100 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 10:90 ethyl acetate/petroleum ether) to afford 1-bromo-4-fluoro-2-methoxy-5-methylbenzene as colorless oil (5.2 g, 35%). LCMS (ES, m/z): 219, 221 [M+H]+.
The Intermediates in Table 7 were synthesized according to the procedure described for Intermediate 17-1 above.
To a solution of 1-bromo-4-fluoro-2-methoxy-5-methylbenzene (5.20 g, 23.7 mmol) in THF (25 mL) was added tris(propan-2-yl) borate (7.74 mL, 33.5 mmol). Then n-BuLi (11 mL, 2.50 M in THF) was added at −78° C. dropwise. The resulting mixture was stirred for 2 h at −30° C. and then was allowed to warm to room temperature. The reaction was quenched by addition of sulfuric acid (25 mL, 0.2 M) and extracted with ethyl acetate (3×60 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 40:60 ethyl acetate/petroleum ether) to afford (4-fluoro-2-methoxy-5-methylphenyl)boronic acid as a white solid (2.20 g, 50%). LCMS (ES, m/z): 185 [M+H]+.
To a solution of 5-bromo-1,2,3,4-tetrahydroisoquinoline (3.00 g, 14.1 mmol) in dichloromethane (30 mL) was added TEA (6.17 mL, 44.5 mmol), di-tert-butyl dicarbonate (9.30 g, 42.6 mmol). The solution was stirred for 16 h at room temperature and concentrated under vacuum. The crude product was purified by silica gel chromatography (eluting with 1:5 ethyl acetate/petroleum ether) to afford tert-butyl 5-bromo-1,2,3,4-tetrahydroisoquinoline-2-carboxylate as a white solid (2.70 g, 61%). LCMS (ES, m/z): 312, 314 [M+H]+.
To a solution of 2-methylcyclopentan-1-one (5.00 g, 50.9 mmol) in toluene (100 mL) was added ammonium acetate (2.70 g, 35.7 mmol), acetic acid (2.8 mL), and ethyl 2-cyanoacetate (5.70 g, 50.9 mmol). The resulting mixture was stirred for 24 h at 100° C. and then cooled to room temperature. The solution was poured into water (100 mL) and then extracted with ethyl acetate (3×100 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 10:90 ethyl acetate/petroleum ether) to afford ethyl 2-cyano-2-[(1Z)-2-methylcyclopentylidene]acetate as colorless oil (2.50 g, 25%). LCMS (ES, m/z): 194 [M+H]+.
To a solution of ethyl 2-cyano-2-[(1Z)-2-methylcyclopentylidene]acetate (1.30 g, 6.73 mmol) in ethanol (100 mL) was added palladium carbon (200 mg, 10 wt % Pd). Hydrogen was introduced with a balloon. The resulting mixture was stirred for 16 h at room temperature. The reaction mixture was filtered and then treated with Raney Ni (400 mg), triethylamine (2.74 mL, 20.2 mmol) and di-tert-butyl dicarbonate (4.40 g, 20.2 mmol). Hydrogen was introduced with a balloon. The solution was stirred for another 16 h at room temperature. The reaction mixture was filtered and concentrated under vacuum. The crude product was purified by silica gel chromatography (eluting with 0:100 to 10:90 ethyl acetate/petroleum ether) to afford ethyl 3-[[(tert-butoxy)carbonyl]amino]-2-(2-methylcyclopentyl)propanoate as a colorless oil (1.00 g, 50%). LCMS (ES, m/z): 300 [M+H]+.
To a solution of ethyl 3-[[(tert-butoxy)carbonyl]amino]-2-(2-methylcyclopentyl)propanoate (500 mg, 1.67 mmol) in tetrahydrofuran (8 mL) and water (8 mL) was added lithium hydroxide (200 mg, 8.35 mmol). The resulting mixture was stirred for 14 h at 45° C. The mixture was diluted with water (20 mL) and washed with ethyl acetate (15 mL). The pH value of the aqueous solution was adjusted to 5-6 with saturated aqueous citric acid. The product was extracted with ethyl acetate (3×15 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum to afford 3-[[(tert-butoxy)carbonyl]amino]-2-(2-methylcyclopentyl)propanoic acid as a colorless oil (350 mg, 77%). LCMS (ES, m/z): 272 [M+H]+.
To a solution of tert-butyl 4-bromo-2,3-dihydro-1H-isoindole-2-carboxylate (6.10 g, 20.5 mmol) in 1,4-dioxane (60 mL) was added potassium ethenyltrifluoroborate (4.34 g, 40.9 mmol), Pd(dppf)Cl2 (1.50 g, 2.05 mmol), and a solution of sodium carbonate (4.10 g, 30.6 mmol) in water (20 mL). The resulting mixture was stirred for 16 h at 100° C. and then cooled to room temperature. The reaction mixture was poured into water (30 mL) and extracted with ethyl acetate (3×30 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 20:80 ethyl acetate/petroleum ether) to afford tert-butyl 4-ethenyl-2,3-dihydro-1H-isoindole-2-carboxylate as a yellow solid (4.00 g, 60%). LCMS (ES, m/z) 190 [M+H-Bu]+.
To a solution of tert-butyl 4-ethenyl-2,3-dihydro-1H-isoindole-2-carboxylate (4.00 g, 16.3 mmol) in tetrahydrofuran (40 mL), water (20 mL) was added sodium periodate (6.93 g, 32.5 mmol), and Osmium (VIII) oxide (413 mg, 1.63 mmol). The resulting solution was stirred for 2 h at room temperature. The reaction mixture was poured into water (20 mL) and extracted with ethyl acetate (3×50 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 1:3 ethyl acetate/petroleum ether) to afford tert-butyl 4-formyl-2,3-dihydro-1H-isoindole-2-carboxylate as a yellow solid (2.50 g, 60%). LCMS (ES, m/z) 192 [M+H-Bu]+.
To a solution of tert-butyl 4-formyl-2,3-dihydro-1H-isoindole-2-carboxylate (2.50 g, 10.1 mmol) in 1,4-dioxane (8.1 mL) was added water (8.1 mL), potassium hydroxide (2.25 g, 40.3 mmol), tribromomethane (2.54 g, 10.1 mmol), and lithium chloride (847 mg, 20.2 mmol) at 0° C. The resulting mixture was stirred for 24 h at room temperature and then another 24 h at 35° C. while keeping pH value >12. The reaction mixture was washed with diethyl ether (50 mL) and then acidified to pH=1 with saturated citric acid. The product was extracted with ethyl acetate (2×50 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The crude product was purified by prep-HPLC (Column: XBridge Shield RP18 OBD Column, 5 μm, 30×150 mm; Mobile Phase, A: water (containing 10 mmol/L NH4HCO3) and B: CH3CN (5% to 40% B over 7 min); Flow rate: 60 mL/min; Detector: UV 254 nm) to afford 3-[[(tert-butoxy)carbonyl](methyl)amino]-2-(3-chloro-4,5-difluorophenyl)propanoic acid as a white solid (580 mg, 5%). LCMS (ES, m/z) 294 [M+H]+.
The Intermediates in Table 8 were synthesized according to the procedure described for Intermediate 22 above.
To a solution of 8-bromo-2-methylimidazo[1,2-a]pyridine (1.00 g, 4.64 mmol) in tetrahydrofuran (15 mL) was added n-BuLi (2.30 mL, 2.5 M in THF) dropwise with stirring at −78° C. The resulting solution was stirred for 10 min before adding diethyl oxalate (1.30 mL, 9.58 mmol). The mixture was stirred for 1 h at −78° C. and then quenched by addition of saturated aqueous ammonium chloride solution (5 mL). The product was extracted with ethyl acetate (3×15 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 50:50 ethyl acetate/petroleum ether) to afford ethyl 2-[2-methylimidazo[1,2-a]pyridin-8-yl]-2-oxoacetate as a yellow oil (565 mg, 50%). LCMS (ES, m/z): 233 [M+H]+.
To a solution of bromo(methyl)triphenyl-lambda5-phosphane (292 mg, 0.82 mmol) in THF (2 mL) was added LiHMDS (137 mg, 0.82 mmol) at −78° C. The mixture was stirred for 20 min at room temperature and added into a solution of ethyl 2-[2-methylimidazo[1,2-a]pyridin-8-yl]-2-oxoacetate (200 mg, 0.82 mmol) in THF (2 mL) at 70° C. The resulting mixture was stirred for 2 h at 70° C. and warmed to room temperature. The reaction mixture was poured into saturated aqueous ammonium chloride solution (10 mL) and then extracted with ethyl acetate (3×10 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by prep-TLC (eluting with 1:1 ethyl acetate/petroleum ether) to afford ethyl 2-[2-methylimidazo[1,2-a]pyridin-8-yl]prop-2-enoate as a yellow oil (35 mg, 19%). LCMS (ES, m/z): 231[M+H]+.
The Intermediates in Table 9 were synthesized according to the procedure described for Intermediate 22-1 above.
To a solution of 2,6-dibromo-4-methoxyaniline (5.00 g, 17.4 mmol) in acetic acid (30 mL) was added acetic anhydride (2.18 mL, 22.7 mmol). The solution was stirred for 30 min at 90° C. and cooled to room temperature. The reaction mixture was poured into ice water (30 mL). The resulting solids were collected by filtration, washed with water (2×30 mL), and dried under vacuum to afford N-(2,6-dibromo-4-methoxyphenyl)acetamide as a light yellow solid (3.20 g, 48%). LCMS (ES, m/z): 322, 324, 326 [M+H]+.
To a solution of N-(2,6-dibromo-4-methoxyphenyl)acetamide (3.20 g, 8.42 mmol) in toluene (100 mL) was added Lawesson's Reagent (1.74 g, 4.21 mmol). The resulting mixture was stirred for 3 h at 110° C. and then cooled to room temperature. The mixture was concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 1:2 ethyl acetate/petroleum ether) to afford N-(2,6-dibromo-4-methoxyphenyl)ethanethioamide as a white solid (2.30 g, 68%). LCMS (ES, m/z): 338, 340, 342 [M+H]+.
To a solution of N-(2,6-dibromo-4-methoxyphenyl)ethanethioamide (2.50 g, 6.27 mmol) in 1,4-dioxane (16 mL) was added cesium carbonate (3.60 g, 10.8 mmol), copper (I) iodide (70 mg, 0.36 mmol), 1,10-phenanthroline (132 mg, 0.72 mmol). The resulting mixture was stirred for 16 h at 85° C. and cooled to room temperature. The reaction mixture was filtered, poured into water (30 mL) and then extracted with ethyl acetate (3×30 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 1:3 ethyl acetate/petroleum ether) to afford 4-bromo-6-methoxy-2-methyl-1,3-benzothiazole as a white solid (1.10 g, 58%). LCMS (ES, m/z): 258, 260 [M+H]+.
To 4-methyl-2,1,3-benzothiadiazole (4.00 g, 25.8 mmol) was added hydrogen bromide (40 mL, 40% in acetic acid) followed by addition of bromine (1.38 mL, 25.8 mmol) at 0° C. The mixture was stirred for 16 h at 120° C. and then cooled to room temperature. The reaction mixture was poured into water (200 mL) and then extracted with ethyl acetate (3×50 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum to afford 4-bromo-7-methyl-2,1,3-benzothiadiazole as a light yellow solid (2.80 g, 45%). LCMS (ES, m/z): 229, 231 [M+H]+.
To a solution of 6-bromopyridin-2-amine (5.00 g, 28.9 mmol) in DMF (50 mL) was added (1,1-dimethoxyethyl)dimethylamine (12.0 g, 90.1 mmol). The resulting mixture was stirred for 16 h at 140° C. and then cooled to room temperature. The reaction mixture was concentrated under vacuum to afford (E)-N′-(6-bromopyridin-2-yl)-N,N-dimethylethanimidamide as a light yellow solid (6.90 g, crude). LCMS (ES, m/z): 242, 244 [M+H]+.
To a solution of (E)-N′-(6-bromopyridin-2-yl)-N,N-dimethylethanimidamide (6.90 g, 28.5 mmol) in methanol (50 mL) was added pyridine (4.58 mL, 56.9 mmol) and (aminooxy)sulfonic acid (4.50 g, 39.9 mmol). The resulting mixture was stirred for 16 h at room temperature. The reaction mixture was poured into water (20 mL) and then extracted with ethyl acetate (3×50 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 40:60 ethyl acetate/petroleum ether) to afford 5-bromo-2-methyl-[1,2,4]triazolo[1,5-a]pyridine as a light yellow solid (1.50 g, 25%). LCMS (ES, m/z): 212, 214 [M+H]+.
To a solution of ethyl 2-cyanoacetate (1.00 g, 8.84 mmol) in DMF (10 mL) was added potassium t-butoxide (991 mg, 8.83 mmol). The resulting mixture was stirred for 30 min at room temperature and was added bromocyclohexane (1.20 g, 7.36 mmol). The resulting mixture was stirred for 16 h at 100° C. and cooled to room temperature. The reaction mixture was poured into water (10 mL) and then extracted with ethyl acetate (3×10 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 1:10 ethyl acetate/petroleum ether) to afford ethyl 2-cyano-2-cyclohexylacetate as a light yellow oil (470 mg, 27%). LCMS (ES, m/z): 196 [M+H]+.
To a solution of ethyl 2-cyano-2-cyclohexylacetate (470 mg, 2.41 mmol) in ethanol (5 mL) was added Pd/C (50 mg, 10 wt % Pd on active carbon). The resulting mixture was stirred for 16 h at room temperature under hydrogen (2-3 atm). The reaction mixture was filtered and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 1:5 ethyl acetate/petroleum ether) to afford ethyl 3-amino-2-cyclohexylpropanoate as a light yellow oil (420 mg, 88%). LCMS (ES, m/z): 200 [M+H]+.
To a solution of ethyl 3-amino-2-cyclohexylpropanoate (420 mg, 2.11 mmol) in dichloromethane (6 mL) was added TEA (0.88 mL, 6.32 mmol), and di-tert-butyl dicarbonate (920 mg, 4.22 mmol). The resulting mixture was stirred for 2 h at room temperature. The reaction mixture was poured into water (10 mL) and then extracted with dichloromethane (3×10 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 1:4 ethyl acetate/petroleum ether) to afford ethyl 3-[[(tert-butoxy)carbonyl]amino]-2-cyclohexylpropanoate as a light yellow solid (510 mg, 80%). LCMS (ES, m/z): 300 [M+H]+.
To a solution of ethyl 3-[[(tert-butoxy)carbonyl]amino]-2-cyclohexylpropanoate (250 mg, 0.83 mmol) in tetrahydrofuran (1.5 mL) and water (1.5 mL) was added lithium hydroxide (100 mg, 4.18 mmol). The resulting mixture was stirred for 16 h at 50° C. and cooled to room temperature. The reaction mixture was washed with diethyl ether (5 mL) and then acidified to pH=5 with citric acid solution (10%). The resulting solution was extracted with ethyl acetate (3×5 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered and concentrated under vacuum to afford 3-[[(tert-butoxy)carbonyl]amino]-2-cyclohexylpropanoic acid as light yellow oil (110 mg, 49%). LCMS (ES, m/z): 272 [M+H]+.
To a solution of 3-bromo-4,5-difluorobenzoic acid (2.50 g, 10.6 mmol) in toluene (15 mL), was added thionyl chloride (15 mL). The resulting solution was refluxed for 3 h, then cooled to room temperature and concentrated under vacuum. The resulting mixture was dissolved in THF (15 mL) and treated with triethylamine (2.47 mL, 17.9 mmol) and (diazomethyl)trimethylsilane (8.8 mL, 2.0 M in THF) at 0° C. The resulting mixture was stirred for 16 h at room temperature and then poured into saturated aqueous sodium bicarbonate (50 mL) and extracted with ethyl acetate (3×100 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting mixture was dissolved in methanol (40 mL) and treated with triethylamine (2.47 mL, 17.9 mmol) and silver (I) benzoate (1.40 g, 6.33 mmol) at 0° C. The mixture was stirred for 16 h at room temperature and then concentrated under vacuum. The crude product was purified by silica gel chromatography (eluting with 0:100 to 10:90 ethyl acetate/petroleum ether) to afford methyl 2-(3-bromo-4,5-difluorophenyl)acetate as a colorless oil (0.98 g, 35%). LCMS (ES, m/z): 265, 267 [M+H]+.
To a solution of methyl 2-(3-bromo-4,5-difluorophenyl)acetate (1.70 g, 6.72 mmol) in 1,4-dioxane (40 mL) was added cyclopropylboronic acid (865 mg, 10.1 mmol), potassium phosphate (4.20 g, 20.1 mmol), Pd(dppf)Cl2 (246 mg, 0.34 mmol) and water (8 mL). The mixture was stirred for 16 h at 90° C. and cooled to room temperature. The reaction mixture was poured into water (50 mL) and then extracted with ethyl acetate (3×50 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The crude product was purified by silica gel chromatography (eluting with 0:100 to 30:70 ethyl acetate/petroleum ether) to afford methyl 2-(3-cyclopropyl-4,5-difluorophenyl)acetate as a colorless oil (550 mg, 36%). LCMS (ES, m/z): 227 [M+H]+.
To a solution of methyl 2-(3-cyclopropyl-4,5-difluorophenyl)acetate (550 mg, 2.43 mmol) in DMF (15 mL), was added potassium carbonate (840 mg, 6.08 mmol), tetrabutylammonium iodide (90 mg, 0.24 mmol) and paraformaldehyde (263 mg, 2.92 mmol). The resulting mixture was stirred for 10 min at 60° C. and then cooled to room temperature. The reaction mixture was poured into water (30 mL) and then extracted with ethyl acetate (3×30 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 30:70 ethyl acetate/petroleum ether) to afford methyl 2-(3-cyclopropyl-4,5-difluorophenyl)prop-2-enoate as a colorless oil (159 mg, 27%). LCMS (ES, m/z): 239 [M+H]+.
To a solution of ethyl 2-(2-amino-1,3-thiazol-4-yl)acetate (5.00 g, 26.3 mmol) in MeCN (50 mL) was added tert-butyl nitrite (4.80 mL, 40.0 mmol) and copper (I) bromide (3.77 g, 26.3 mmol) at 60° C. The mixture was stirred for 2 h at 75° C. and then cooled to room temperature. The reaction mixture was concentrated under vacuum. The crude product was purified by silica gel chromatography (eluting with 0:100 to 10:90 ethyl acetate/petroleum ether) to afford ethyl 2-(2-bromo-1,3-thiazol-4-yl)acetate as a yellow oil (2.70 g, 41%). LCMS (ES, m/z): 250, 252 [M+H]+.
To a solution of ethyl 2-(2-bromo-1,3-thiazol-4-yl)acetate (2.50 g, 9.50 mmol) in DMF (20 mL) was added paraformaldehyde (1.20 g, 13.3 mmol), potassium carbonate (3.45 g, 25.0 mmol), and tetrabutylammonium iodide (369 mg, 1.00 mmol). The resulting mixture was stirred for 10 min at 60° C. and then cooled to room temperature. The reaction mixture was poured into water (50 mL) and then extracted with ethyl acetate (3×50 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 1:100 ethyl acetate/petroleum ether) to afford ethyl 2-(2-bromo-1,3-thiazol-4-yl)prop-2-enoate as a yellow oil (350 mg, 14%). LCMS (ES, m/z): 262, 264 [M+H]+.
To a solution of ethyl 2-(2-bromo-1,3-thiazol-4-yl)-3-[[(tert-butoxy)carbonyl](methyl)amino]propanoate (350 mg, 0.85 mmol) in 1,4-dioxane (10 mL) and water (1 mL) was added cyclopropylboronic acid (115 mg, 1.31 mmol), potassium phosphate (566 mg, 2.67 mmol), and Pd(dppf)Cl2 (33 mg, 0.05 mmol). The resulting mixture was stirred for 18 h at 100° C. and then cooled to room temperature. The reaction mixture was poured into water (20 mL) and then extracted with ethyl acetate (3×20 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 20:80 ethyl acetate/petroleum ether) to afford ethyl 3-[[(tert-butoxy)carbonyl](methyl)amino]-2-(2-cyclopropyl-1,3-thiazol-4-yl)propanoate as a yellow oil (180 mg, 60%). LCMS (ES, m/z): 355 [M+H]+.
To a solution of 4-bromo-2-methyl-1,3-benzothiazole (1.00 g, 4.40 mmol) in toluene (10 mL) was added methyl 2-cyanoacetate (1.30 g, 13.1 mmol), Pd2(dba)3.CHCl3(227 mg, 0.22 mmol), P(t-Bu)3.HBF4(318 mg, 1.09 mmol) and sodium phosphate (2.19 g, 0.01 mol). The resulting mixture was irradiated in a microwave for 3 h at 125° C. and cooled to room temperature. The reaction was repeated three times and the batches were combined and poured into water (10 mL) and then extracted with ethyl acetate (3×30 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 30:70 ethyl acetate/petroleum ether) to afford methyl 2-cyano-2-(2-methyl-1,3-benzothiazol-4-yl)acetate as a yellow oil (1.80 g, 44%). LCMS (ES, m/z): 247 [M+H]+.
To a solution of methyl 2-cyano-2-(2-methyl-1,3-benzothiazol-4-yl)acetate (1.80 g, 7.31 mmol) in methanol (90 mL) and tetrahydrofuran (90 mL) was added TEA (5.08 mL, 36.6 mmol), di-tert-butyl dicarbonate (3.19 g, 14.6 mmol) and Raney Ni (800 mg). The resulting mixture was stirred for 16 h at room temperature under hydrogen atmosphere (2-3 atm). The reaction mixture was filtered and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 30:70 ethyl acetate/petroleum ether) to afford methyl 3-(tert-butoxycarbonylamino)-2-(2-methylbenzo[d]thiazol-4-yl)propanoate as yellow oil (730 mg, 27%). LCMS (ES, m/z): 351 [M+H]+.
To a solution of methyl 3-[[(tert-butoxy)carbonyl]amino]-2-(2-methyl-1,3-benzothiazol-4-yl)propanoate (730 mg, 1.90 mmol) in tetrahydrofuran (4 mL) and water (4 mL) was added lithium hydroxide (251 mg, 10.5 mmol). The resulting mixture was stirred for 16 h at room temperature. The reaction mixture was washed with diethyl ether (1×8 mL) and then acidified to pH=5 with saturated citric acid. The resulting solution was extracted with ethyl acetate (2×8 mL). The organic layers were combined, dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum to afford 3-[[(tert-butoxy)carbonyl]amino]-2-(2-methyl-1,3-benzothiazol-4-yl)propanoic acid as a yellow oil (570 mg, 86%). LCMS (ES, m/z): 337 [M+H]+.
To a solution of 2,6-dibromoaniline (5.00 g, 19.5 mmol) in AcOH (50 mL) was added acetyl acetate (2.78 mL, 29.3 mmol). The resulting mixture was stirred for 1 h at 90° C. and then cooled to room temperature. The reaction was quenched in ice water (100 mL). The solids were collected by filtration and dried under vacuum to afford N-(2,6-dibromophenyl)acetamide as a white solid (2.00 g, 33%). LCMS (ES, m/z): 292, 294, 296 [M+H]+.
To a solution of N-(2,6-dibromophenyl)acetamide (2.00 g, 6.49 mmol) in 1,4-dioxane (20 mL) was added copper (I) iodide (124 mg, 0.65 mmol), 1,10-phenanthroline (117 mg, 0.65 mmol), and potassium carbonate (1.79 g, 12.9 mmol). The resulting mixture was stirred for 16 h at 90° C. and then cooled to room temperature. The reaction mixture was poured into water (50 mL) and then extracted with ethyl acetate (3×50 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 10:90 ethyl acetate/petroleum ether) to afford 4-bromo-2-methyl-1,3-benzoxazole as a yellow solid (900 mg, 65%). LCMS (ES, m/z): 212, 214 [M+H]+.
To a solution of 6-bromo-2,3-difluoroaniline (4.00 g, 16.4 mmol) in dichloromethane (40 mL) was added 4-dimethylaminopyridine (116 mg, 0.90 mmol), TEA (3.64 mL, 27.5 mmol), and acetyl chloride (1.98 g, 24 mmol). The resulting mixture was stirred for 2 h at room temperature. The reaction mixture was poured into water (30 mL) and then extracted with ethyl acetate (3×30 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 1:5 ethyl acetate/petroleum ether) to afford N-(6-bromo-2,3-difluorophenyl)acetamide as yellow oil (4.30 g, 92%). LCMS (ES, m/z): 250, 252 [M+H]+.
To a solution of N-(6-bromo-2,3-difluorophenyl)acetamide (2.50 g, 8.50 mmol) in toluene (20 mL) was added Lawesson reagent (2.43 g, 5.71 mmol). The resulting mixture was stirred for 4 h at 110° C. and then cooled to room temperature. The reaction mixture was poured into water (30 mL) and then extracted with ethyl acetate (3×30 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 1:4 ethyl acetate/petroleum ether) to afford 4-bromo-7-fluoro-2-methyl-1,3-benzothiazole as a yellow solid (2.20 g, 89%). LCMS (ES, m/z): 246, 248 [M+H]+.
To a solution of methyl 2-(3-chlorophenyl)acetate (5.00 g, 25.7 mmol) in CH3CN (50 mL) was added 1,8-diazabicyclo[5.4.0]undec-7-ene (4.87 mL, 32.6 mmol) dropwise with stirring at 0° C. followed by the addition of 4-methylbenzene-1-sulfonyl azide (6.40 g, 32.5 mmol) added dropwise with stirring at 0° C. The solution was stirred for 4 h at 25° C. The reaction mixture was treated with water (50 mL) and extracted with ethyl acetate (3×50 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 10:90 ethyl acetate/dichloromethane) to afford methyl 2-(3-chlorophenyl)-2-diazoacetate as a yellow solid (5.00 g, 83%). LCMS (ES, m/z): 211, 213 [M+H]+.
To a solution of tert-butyl pyrrolidine-1-carboxylate (894 mg, 5.22 mmol) in hexane (150 mL) was added tetrakis [(R)-(+)-N—(P-dodecylphenylsulfonyl)prolinato]dirhodium (II) (49 mg, 0.026 mmol) followed by treatment with methyl 2-(3-chlorophenyl)-2-diazoacetate (550 mg, 2.61 mmol) as a solution in hexane (100 mL) over 60 min with stirring at −50° C. The resulting solution was stirred for 10 h at −50° C. and then 16 h at room temperature. The reaction was poured into saturated ammonium chloride solution (100 mL) and then extracted with ethyl acetate (3×150 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 10:90 ethyl acetate/petroleum ether) to afford tert-butyl 2-[1-(3-chlorophenyl)-2-methoxy-2-oxoethyl]pyrrolidine-1-carboxylate as a yellow solid (400 mg, 39%). LCMS (ES, m/z): 354, 356 [M+H]+.
To a solution of tert-butyl 2-[1-(3-chlorophenyl)-2-methoxy-2-oxoethyl]pyrrolidine-1-carboxylate (400 mg, 1.13 mmol) in tetrahydrofuran (20 mL) and water (5 mL) was added lithium hydroxide (135 mg, 5.65 mmol). The resulting mixture was stirred for 18 h at room temperature. The reaction mixture was washed with diethyl ether (1×10 mL) and then acidified to pH=6 with saturated citric acid. The resulting solution was extracted with ethyl acetate (3×20 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum to afford 2-{1-[(tert-butoxy)carbonyl]pyrrolidin-2-yl}-2-(3-chlorophenyl)acetic acid as yellow oil (300 mg, 78%). LCMS (ES, m/z): 340, 342 [M+H]+.
The Intermediates in Table 10 were synthesized according to the procedure described for Intermediate 33-1 above.
To a solution of ethyl 2-phenylacetate (5.00 g, 30.4 mmol) in toluene (25 mL) was added sodium hydride (2.20 g, 91.7 mmol, 60% dispersion in mineral oil) in portions with stirring at 0° C. The resulting mixture was stirred for 1 h at 0° C. and treated with methyl formate (9.34 mL, 152 mmol). The mixture was stirred for 16 h at 25° C. The reaction was treated with saturation aqueous ammonium chloride (20 mL) and extracted with ethyl acetate (3×50 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The crude product was purified by silica gel chromatography (eluting with 0:100 to 10:90 ethyl acetate/dichloromethane) to afford ethyl 3-oxo-2-phenylpropanoate as a yellow solid (2.00 g, 22%). LCMS (ES, m/z): 193 [M+H]+.
To a solution of ethyl 3-oxo-2-phenylpropanoate (500 mg, 2.60 mmol) in dichloromethane (5 mL), was added oxetan-3-amine (949 mg, 12.9 mmol). The resulting mixture was stirred for 16 h at 25° C. The reaction was poured into water (10 mL) and then extracted with ethyl acetate (3×15 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The crude product was purified by silica gel chromatography (eluting with 0:100 to 25:75 ethyl acetate/petroleum ether) to afford ethyl (3E)-3-[(oxetan-3-yl)imino]-2-phenylpropanoate as a yellow oil (350 mg, 44%). LCMS (ES, m/z): 248 [M+H]+.
To a solution of ethyl 3-[(oxetan-3-yl)amino]-2-phenylpropanoate (350 mg, 1.40 mmol) in methanol (5 mL) was added palladium on activated carbon (35 mg, 10 wt %). The resulting mixture was stirred for 16 h at 25° C. under hydrogen atmosphere (2-3 atm). The reaction mixture was filtered and concentrated under vacuum to afford ethyl 3-[(oxetan-3-yl)amino]-2-phenylpropanoate as a yellow oil (100 mg, 28%). LCMS (ES, m/z): 250 [M+H]+.
To a solution of ethyl 3-[(oxetan-3-yl)amino]-2-phenylpropanoate (100 mg, 0.36 mmol) in tetrahydrofuran (4 mL) and water (4 mL) was added lithium hydroxide (48 mg, 2.00 mmol). The resulting mixture was stirred for 6 h at room temperature. The reaction mixture was washed with diethyl ether (1×8 mL) and then acidified to pH=5 with saturated aqueous citric acid. The product was extracted with ethyl acetate (2×8 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum to afford 3-[(oxetan-3-yl)amino]-2-phenylpropanoic acid as a yellow oil (60 mg, 68%). LCMS (ES, m/z): 222 [M+H]+.
To a solution of ethyl 3-oxo-2-phenylpropanoate (500 mg, 2.60 mmol) in dichloromethane (10 mL) was added azetidin-3-ol hydrochloride (1.45 g, 13.2 mmol). The resulting mixture was stirred for 2 hours and treated with sodium triacetoxyborohydride (1.65 g, 7.80 mmol). The mixture was stirred for 16 h at room temperature and then poured into water (5 mL). The resulting mixture was extracted with dichloromethane (3×5 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The crude product was purified by prep-TLC (eluting with 1:5 ethyl acetate/petroleum ether) to afford ethyl 3-(3-hydroxyazetidin-1-yl)-2-phenylpropanoate as a yellow oil (300 mg, 46%). LCMS (ES, m/z): 250 [M+H]+.
To a solution of ethyl 3-(3-hydroxyazetidin-1-yl)-2-phenylpropanoate (200 mg, 0.72 mmol) in tetrahydrofuran (3 mL) was added water (3 mL), and lithium hydroxide (120 mg, 5.01 mmol). The resulting mixture was stirred for 16 h at room temperature. The reaction mixture was washed with diethyl ether (1×5 mL) and then acidified to pH=5 with saturated aqueous citric acid. The resulting solution was extracted with ethyl acetate (3×5 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum to afford 3-(3-hydroxyazetidin-1-yl)-2-phenylpropanoic acid as a white solid (100 mg, 56%). LCMS (ES, m/z): 222 [M+H]+.
The Intermediates in Table 11 were synthesized according to the procedure described for Intermediate 35-1 above.
To methyl 2-hydroxy-2-phenylacetate (6.00 g, 35.8 mmol) was added sulfuryl chloride (30 mL). The reaction was stirred for 30 min at 80° C. and cooled to room temperature. The reaction was then poured into water (60 mL) and then extracted with ethyl acetate (3×50 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 30:70 ethyl acetate/petroleum ether) to afford methyl 2-chloro-2-phenylacetate as a colorless oil (6.00 g, 91%). LCMS (ES, m/z): 185, 187 [M+H]+.
To a solution of tert-butyl 3-hydroxyazetidine-1-carboxylate (6.20 g, 35.4 mmol) in tetrahydrofuran (200 mL) was added sodium hydride (1.90 g, 47.5 mmol, 60% dispersion in mineral oil) in portions with stirring at 0° C. After stirring for 30 min, 2-chloro-2-phenylacetate (6.00 g, 32.5 mmol) was added. The reaction was stirred for 5 h at 0° C. and then poured into water (100 mL). The product was extracted with ethyl acetate (3×200 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The crude product was purified by silica gel chromatography (eluting with 0:100 to 100:0 ethyl acetate/petroleum ether) to afford tert-butyl 3-(2-methoxy-2-oxo-1-phenylethoxy)azetidine-1-carboxylate as a yellow oil (2.00 g, 19%). LCMS (ES, m/z): 322 [M+H]+.
To a solution of tert-butyl 3-(2-methoxy-2-oxo-1-phenylethoxy)azetidine-1-carboxylate (2.00 g, 5.73 mmol) in tetrahydrofuran (15 mL) was added water (15 mL) and lithium hydroxide (747 mg, 31.2 mmol). The resulting mixture was stirred for 18 h at 25° C. The reaction mixture was diluted with water (10 mL) and then acidified to pH=4 with hydrochloric acid (1 N). The product was extracted with ethyl acetate (3×20 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by Prep-HPLC (Column: XBridge Shield RP18 OBD Column, 5 μm, 19×150 mm; Mobile Phase, A: water (containing 0.03% NH3) and B: MeCN (5% to 50% over 30 min); Flow rate: 100 mL/min; Detector: UV 254 nm). The product fractions were concentrated and lyophilized to afford 2-([1-[(tert-butoxy)carbonyl]azetidin-3-yl]oxy)-2-phenylacetic acid as a yellow oil (700 mg, 40%). LCMS (ES, m/z): 308 [M+H]+.
To a solution of 2-(azetidin-3-yloxy)-1-[5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl]-2-phenylethan-1-one TFA salt (330 mg, 0.52 mmol) in methanol (8 mL) was added acetic acid (2 mL) and 2-[(tert-butyldimethylsilyl)oxy]acetaldehyde (127 mg, 0.73 mmol). The resulting mixture was stirred for 1 hour at 25° C. Then it was added sodium triacetoxyborohydride (422 mg, 1.99 mmol). The resulting mixture was stirred for 18 h at 25° C. The reaction mixture was poured into water (10 mL) and then extracted with ethyl acetate (3×10 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 1:10 MeOH/DCM) to afford 2-[(1-[2-[(tert-butyldimethylsilyl)oxy]ethyl]azetidin-3-yl)oxy]-1-[5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl]-2-phenylethan-1-one as a yellow oil (150 mg, 44%). LCMS (ES, m/z): 656 [M+H]+.
To a solution of 2,3-dimethylbut-2-ene (1000 g, 11.9 mol) in DCM (500 mL) in 4 L 4-necked round bottom flask was added aqueous hydrogen bromide solution (150 mL, 48%). The reaction was treated with bromine (9.90 kg, 62.0 mol) while stirring at 0° C. and then heated to 45° C. in an oil bath and stirred for an additional 2 days. After cooling to room temperature, the reaction mixture was carefully poured into saturated sodium hydrogen sulfite solution (10 L). The precipitate was collected by filtration and dried in oven to afford 1,4-dibromo-2,3-bis(bromomethyl)but-2-ene as a light yellow solid (3345 g, 49%). GCMS: (EI, m/z): 398, 400, 402 [M]+.
To a solution of 1,4-dibromo-2,3-bis(bromomethyl)but-2-ene (2000 g, 3.50 mol) in DMF (20 L) was added 4-methylbenzene-1-sulfonamide (2137 g, 12.5 mol), and potassium carbonate (5175 g, 37.4 mol). The resulting mixture was stirred for 2 days at room temperature. The reaction mixture was then slowly poured into water/ice (20 L). The precipitate was collected by filtration, washed with ethanol and dried in oven to afford 2,5-ditosyl-1,2,3,4,5,6-hexahydropyrrolo[3,4-c]pyrrole as alight yellow solid (1345 g, 78%). LCMS: (ES, m/z): 419 [M+H]+.
To a solution of 2,5-ditosyl-1,2,3,4,5,6-hexahydropyrrolo[3,4-c]pyrrole (1345 g, 2.73 mol) in aqueous hydrogen bromide solution (4500 mL, 48%) in 10 L 4-necked round-bottom flask, was added phenol (1270 g, 13.5 mol). The resulting mixture was stirred for 2 days at 120° C. After cooling to room temperature, the aqueous layer was collected and concentrated under vacuum. The resulting solids were washed with DCM/MeOH (v:v=10:1, 3×300 mL) and dried in an oven to afford 1,2,3,4,5,6-hexahydropyrrolo[3,4-c]pyrrole hydrogen bromide salt as a yellow solid (480 g, 61%). LCMS: (ES, m/z): 111 [M+H]+.
To a solution of n-BuLi (2.0 mL, 2.5 M in hexane) was added n-Bu2Mg (4.8 mL, 1.0 M in heptane). The resulting mixture was stirred for 10 min at room temperature. The reaction was treated with 7-bromo-2H,3H-[1,4]dioxino[2,3-b]pyridine (2.0 g, 9.26 mmol) in tetrahydrofuran (16 mL) added dropwise with stirring at −10° C. over a period of 10 min. The mixture was stirred for 1 h at −10° C. and then slowly added to a solution of sulfuryl dichloride (16 mL, 0.20 mol) in toluene (16 mL) at −10° C. and stirred for an additional 1 h. The reaction was quenched by the careful addition of saturated aqueous ammonium chloride solution (30 mL) at 0° C. The product was extracted with dichloromethane (3×50 mL). The organic layers were combined, dried over anhydrous sodium sulfate, filtered and concentrated under vacuum. The resulting crude product was purified by silica gel column (eluted with 1:3 ethyl acetate/petroleum ether) to afford 2H,3H-[1,4]dioxino[2,3-b]pyridine-7-sulfonyl chloride as a white solid (1.3 g, 60%). LCMS: (ES, m/z): 236, 238 [M+H]+.
To a solution of 1H-imidazole (14.5 g, 212 mmol) in dichloromethane (140 mL) was added 2H,3H-[1,4]dioxino[2,3-b]pyridine-7-sulfonyl chloride (25.0 g, 96 mmol) in dichloromethane (250 mL) dropwise with stirring at 0° C. The resulting mixture was stirred for 2 h at room temperature and then filtered and concentrated under vacuum. The solids were dissolved in absolute ethanol (125 mL) and added dropwise to a solution of 1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrole dihydrobromide (86.8 g, 319 mmol) in water (125 mL). The reaction was stirred for 18 h at room temperature and then 48 h at 60° C. After cooling to room temperature, the mixture was rendered basic (pH=14) with aqueous sodium hydroxide (50 wt %). The product was extracted with dichloromethane (3×300 mL). The organic layers were combined, dried over anhydrous sodium sulfate, filtered and concentrated under vacuum to afford of 2-[2H,3H-[1,4]dioxino[2,3-b]pyridine-7-sulfonyl]-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrole as a yellow solid (13 g, 39.5%). LCMS: (ES, m/z): 310 [M+H]+.
To a solution of potassium hydroxide (3.25 g, 58.0 mmol) in water (11.6 mL) was added LiCl (1.30 g, 29.0 mmol), 1,4-dioxane (11.6 mL), 2-fluoro-5-methylbenzaldehyde (2.00 g, 14.5 mmol) and tribromomethane (3.67 g, 14.5 mmol). The resulting mixture was stirred for 24 h at 5° C. and then for 24 h at 35° C. The reaction was washed with diethyl ether (1×8 mL) and then acidified to pH=1 with hydrochloric acid (1 N). The resulting solution was extracted with ethyl acetate (2×20 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum to afford 2-(2-fluoro-5-methylphenyl)-2-hydroxyacetic acid as yellow oil (1.80 g, 60%). LCMS (ES, m/z): 183 [M−H]−.
To a solution of 3-chloro-4,5-difluorobenzoic acid (3.00 g, 15.6 mmol) in toluene (30 mL), was added thionyl chloride (15 mL). The resulting solution was refluxed for 3 h, then cooled to room temperature and concentrated under vacuum. The resulting mixture was dissolved with THF (30 mL). The reaction was treated with triethylamine (3.70 mL, 26.5 mmol) and (diazomethyl)trimethylsilane (13.2 mL, 2.0 M in THF) at 0° C. and stirred for 16 h at room temperature. The reaction was poured into saturated aqueous sodium bicarbonate (50 mL) and extracted with ethyl acetate (3×100 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting mixture was dissolved in methanol (40 mL) and treated with triethylamine (3.70 mL, 26.5 mmol) and silver (I) benzoate (2.10 g, 9.35 mmol) at 0° C. The resulting mixture was stirred for 16 h at room temperature and then concentrated under vacuum. The crude product was purified by silica gel chromatography (eluting with 0:100 to 10:90 ethyl acetate/petroleum ether) to afford methyl 2-(3-chloro-4,5-difluorophenyl)acetate as a colorless oil (2.00 g, 58%). LCMS (ES, m/z): 221, 223 [M+H]+.
To a solution of methyl 2-(3-chloro-4,5-difluorophenyl)acetate (600 mg, 2.72 mmol) in MeCN (20 mL), was added DBU (496 mg, 3.26 mmol) and 4-methylbenzene-1-sulfonyl azide (751 mg, 3.81 mmol) at 0° C. The resulting solution was stirred for 16 h at room temperature. The reaction mixture was poured into water (25 mL) and then extracted with ethyl acetate (3×25 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 10:90 ethyl acetate/petroleum ether) to afford methyl 2-(3-chloro-4,5-difluorophenyl)-2-diazoacetate as a yellow solid (600 mg, 85%). LCMS (ES, m/z): 247, 249 [M+H]+.
To a solution of methyl 2-(3-chloro-4,5-difluorophenyl)-2-diazoacetate (689 mg, 2.79 mmol) in DCM (40 mL), was added tert-butyl N-(2-hydroxyethyl)-N-methylcarbamate (587 mg, 3.35 mmol), and Rhodium (II) acetate dimer (49 mg, 0.11 mmol). The resulting mixture was stirred for 16 h at room temperature and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 10:90 ethyl acetate/petroleum ether) to afford methyl 2-(2-{[(tert-butoxy)carbonyl](methyl)amino}ethoxy)-2-(3-chloro-4,5-difluorophenyl)acetate as a light yellow oil (700 mg, 63%). LCMS (ES, m/z): 394, 396 [M+H]+.
To a solution of methyl 2-(2-{[(tert-butoxy)carbonyl](methyl)amino}ethoxy)-2-(3-chloro-4,5-difluorophenyl)acetate (200 mg, 0.51 mmol) in THF (7 mL), was added water (7 mL) and lithium hydroxide (61 mg, 2.54 mmol). The resulting mixture was stirred for 16 h at 25° C. The reaction mixture was acidified to pH=6-7 with saturated citric acid and then extracted with ethyl acetate (3×15 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum to afford 2-(2-{[(tert-butoxy)carbonyl](methyl)amino}ethoxy)-2-(3-chloro-4,5-difluorophenyl)acetic acid as a light yellow oil (180 mg, 93%). LCMS (ES, m/z): 380, 382 [M+H]+.
To a solution of methyl 2-(3-hydroxyphenyl)acetate (2.00 g, 11.4 mmol) in DMF (20 mL) was added sodium 2-chloro-2,2-difluoroacetate (2.75 g, 17.1 mmol) and cesium carbonate (7.84 g, 22.9 mmol). The resulting mixture was stirred for 12 h at 90° C. and cooled to room temperature. The reaction mixture was poured into water (10 mL) and then extracted with ethyl acetate (3×10 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 3:1 ethyl acetate/petroleum ether) to afford methyl 2-[3-(difluoromethoxy)phenyl]acetate as yellow oil (1.00 g, 34%). LCMS (ES, m/z): 217 [M+H]+.
To a solution of methyl 2-[3-(difluoromethoxy)phenyl]acetate (1.00 g, 3.93 mol) in MeCN (15 mL) was added 1-(azidodimethylidene-lambda6-sulfanyl)-4-methylbenzene (979 mg, 4.72 mmol) and DBU (882 mg, 5.51 mmol) at 0° C. The resulting mixture was stirred for 12 h at rt. The reaction mixture was poured into water (10 mL) and then extracted with ethyl acetate (3×10 mL). The combined organic layers were washed with saturated ammonium chloride solution (10 mL) and then dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 4:1 ethyl acetate/petroleum ether) to afford methyl 2-diazo-2-[3-(difluoromethoxy)phenyl]acetate as a yellow oil (800 mg, 71%). LCMS (ES, m/z): 243 [M+H]+.
To a solution of methyl 2-diazo-2-[3-(difluoromethoxy)phenyl]acetate (400 mg, 1.40 mmol) in DCM (5 mL) was added Rhodium (II) acetate dimer (26 mg, 0.06 mmol) and 2-methoxyethan-1-ol (135 mg, 1.69 mmol). The resulting mixture was stirred for 4 h at rt. The resulting mixture was filtered and concentrated under vacuum. The residue was purified by silica gel column chromatography (eluted with 1:3 EtOAc/petroleum ether) to afford methyl 2-[3-(difluoromethoxy)phenyl]-2-(2-methoxyethoxy)acetate as a yellow oil (300 mg, 63%). LCMS (ES, m/z): 291 [M+H]+.
To a solution of methyl 2-[3-(difluoromethoxy)phenyl]-2-(2-methoxyethoxy)acetate (300 mg, 0.88 mmol) in THF (3 mL) was added water (3 mL) and lithium hydroxide (111 mg, 4.39 mmol). The resulting mixture was stirred for 16 h at rt. The resulting mixture was washed with diethyl ether (1×5 mL) and acidified to pH=5 with hydrochloric acid (0.5 N). The resulting solution was extracted with ethyl acetate (3×5 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum to afford 2-[3-(difluoromethoxy)phenyl]-2-(2-methoxyethoxy)acetic acid as a white solid (150 mg, 53%). LCMS (ES, m/z): 277 [M+H]+.
To a solution of 3-methyl-2-nitrophenol (200 g, 1.29 mol) in acetic anhydride (1600 mL) was added sulfuric acid (240 mL) and acetic acid (1620 mL). This was followed by the addition of chromium trioxide (280 g, 2.77 mol) in several batches with stirring at 0° C. The resulting mixture was stirred for 2.5 h at 0° C. and then poured into ice/water (5000 mL). The solids were collected by filtration and then washed with water (3×1 L), saturated sodium carbonate solution (3×800 mL), and water (3×1 L). The solids were dissolved in ethanol (380 mL) and concentrated hydrochloric acid (617 mL). The resulting solution was stirred for 1.5 h at 110° C. and then cooled to room temperature. The reaction mixture was concentrated under vacuum to afford 3-hydroxy-2-nitrobenzaldehyde as a yellow solid (38.0 g, 18%). LCMS (ES, m/z): 166 [M−H]−.
To a solution of 3-hydroxy-2-nitrobenzaldehyde (38.0 g, 204 mmol) in dichloromethane (500 mL) was added ZnI2 (14.5 g, 44.5 mmol). The reaction was treated with trimethylsilyl cyanide (100 mL, 708 mmol) added dropwise with stirring at 0° C. The resulting mixture was stirred for 2.5 h at 25° C. The reaction was poured into brine (200 mL) and then extracted with ethyl acetate (3×500 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum to afford 2-hydroxy-2-(3-hydroxy-2-nitrophenyl)acetonitrile as a yellow solid (34.0 g, 73%). LCMS (ES, m/z): 195 [M+H]+.
To a solution of 2-hydroxy-2-(3-hydroxy-2-nitrophenyl)acetonitrile (34.0 g, 157 mmol) in methanol (80 mL) was added hydrochloric acid (80 mL, 4 N in 1,4-dioxane). The resulting solution was stirred for 45 min at 60° C. and cooled to room temperature. The reaction mixture was concentrated under vacuum and purified by silica gel chromatography (eluting with 0:100 to 35:65 ethyl acetate/petroleum ether) to afford methyl 2-hydroxy-2-(3-hydroxy-2-nitrophenyl)acetate as a yellow solid (23.0 g, 58%). LCMS (ES, m/z): 228 [M+H]+.
To a solution of methyl 2-hydroxy-2-(3-hydroxy-2-nitrophenyl)acetate (23.0 g, 0.11 mol) in methanol (500 mL) was added anhydrous palladium carbon (2.3 g, 10 wt % Pd). The resulting mixture was stirred for 16 h at 25° C. under hydrogen atmosphere (3 atm). The reaction mixture was filtered and concentrated under vacuum to afford methyl 2-(2-amino-3-hydroxyphenyl)-2-hydroxyacetate as a yellow solid (14.0 g, 60%). LCMS (ES, m/z): 198 [M+H]+.
To a solution of methyl 2-(2-amino-3-hydroxyphenyl)-2-hydroxyacetate (9.0 g, 43.4 mmol) in 1,1,1-triethoxyethane (150 mL) was added bismuth (III) trifluoromethanesulfonate (800 mg, 1.18 mmol). The resulting mixture was stirred for 10 min at 85° C. After cooling to room temperature, the reaction mixture was concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 50:50 ethyl acetate/petroleum ether) to afford methyl 2-hydroxy-2-(2-methyl-1,3-benzoxazol-4-yl)acetate as a white solid (6.3 g, 63%). LCMS (ES, m/z): 222 [M+H]+.
To a solution of methyl 2-hydroxy-2-(2-methyl-1,3-benzoxazol-4-yl)acetate (500 mg, 2.26 mmol) in tetrahydrofuran (20 mL) and water (2 mL) was added lithium hydroxide (271 mg, 11.3 mmol). The resulting mixture was stirred for 1 h at room temperature. The reaction mixture was washed with diethyl ether (1×10 mL) and then acidified to pH=6 with hydrochloric acid (1 N). The resulting solution was extracted with ethyl acetate (2×20 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum to afford 2-hydroxy-2-(2-methyl-1,3-benzoxazol-4-yl)acetic acid as a white solid (386 mg, 82%). LCMS (ES, m/z): 208 [M+H]+.
To a solution of 4-bromo-2-methyl-1,3-benzothiazole (2.10 g, 9.21 mmol) in 1,4-dioxane (70 mL) was added (tributylstannyl)methanol (3.84 g, 12.0 mmol), and Pd(PPh3)4(1.60 g, 1.38 mmol). The resulting mixture was stirred for 16 h at 100° C. and then cooled to room temperature. The reaction mixture was poured into water (50 mL) and then extracted with ethyl acetate (3×70 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The crude product was purified by silica gel chromatography (eluting with 0:100 to 80:20 ethyl acetate/petroleum ether) to afford (2-methyl-1,3-benzothiazol-4-yl)methanol as a yellow oil (1.20 g, 73%). LCMS (ES, m/z): 180 [M+H]+.
To a solution of oxalyl chloride (1.39 mL, 13.39 mmol) in dichloromethane (30 mL) was added DMSO (1.43 mL, 20.1 mmol) dropwise with stirring at −78° C. The resulting mixture was stirred for 30 min at −78° C. The reaction was treated with (2-methyl-1,3-benzothiazol-4-yl)methanol (1.20 g, 6.69 mmol) in dichloromethane (10 mL) added slowly at −78° C. After 2 h TEA (5.58 mL, 40.1 mmol) was added and the mixture was warmed to room temperature and stirred for 2 h. The reaction was poured into brine (30 mL) and then extracted with ethyl acetate (3×50 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum to afford 2-methyl-1,3-benzothiazole-4-carbaldehyde as a yellow oil (900 mg, 76%). LCMS (ES, m/z): 178 [M+H]+.
To a solution of 2-methyl-1,3-benzothiazole-4-carbaldehyde (900 mg, 5.08 mmol) in DCM (10 mL) was added trimethylsilyl cyanide (2.02 mL, 15.2 mmol) and ZnI2 (162 mg, 0.51 mmol). The resulting mixture was stirred for 1 h at room temperature. The reaction mixture was poured into water (5 mL) and then extracted with ethyl acetate (3×10 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum to afford 2-hydroxy-2-(2-methyl-1,3-benzothiazol-4-yl)acetonitrile as yellow oil (800 mg, 65%). LCMS (ES, m/z): 205 [M+H]+.
To a solution of 2-hydroxy-2-(2-methyl-1,3-benzothiazol-4-yl)acetonitrile (800 mg, 3.92 mmol) in methanol (30 mL) was added concentrated hydrochloric acid (30 mL, 12 N). The resulting solution was stirred for 4 h at 60° C. and cooled to room temperature. The reaction mixture was poured into water (5 mL) and then extracted with ethyl acetate (3×10 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum to afford methyl 2-hydroxy-2-(2-methyl-1,3-benzothiazol-4-yl)acetate as a yellow oil (300 mg, crude). LCMS (ES, m/z): 238 [M+H]V.
To a solution of 2-hydroxy-2-(2-methyl-1,3-benzothiazol-4-yl)acetic acetate (500 mg, 2.24 mmol) in tetrahydrofuran (3 mL) and water (3 mL) was added lithium hydroxide (253 mg, 10.6 mmol). The resulting mixture was stirred for 16 h at room temperature. The reaction mixture was washed with diethyl ether (1×8 mL) and then acidified to pH=5 with saturated citric acid. The resulting solution was extracted with ethyl acetate (2×8 mL). The organic layers were combined, dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum to afford 2-hydroxy-2-(2-methyl-1,3-benzothiazol-4-yl)acetic acid as yellow oil (300 mg, 58%). LCMS (ES, m/z): 224 [M+H]+.
The Intermediates in Table 12 were synthesized according to the procedure described for Intermediate 45-2 above.
To a solution of 1-methyl-1H-pyrazole-3-carbaldehyde (10.0 g, 89.0 mmol) in N,N-dimethylformamide (120 mL), was added a solution of NBS (16.0 g, 88.1 mmol) in N,N-dimethylformamide (30 mL) with stirring at 0° C. The solution was stirred for 2 h at 25° C. The reaction mixture was poured into water (300 mL) and treated with saturated sodium hydroxide solution (15 mL). The product was extracted with ethyl acetate (3×150 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The crude product was purified by silica gel chromatography (eluting with 0:100 to 50:50 ethyl acetate/petroleum ether) to afford 4-bromo-1-methyl-1H-pyrazole-3-carbaldehyde as a white solid (13.0 g, 77%). LCMS (ES, m/z): 189, 191 [M+H]+.
To a solution of 4-bromo-1-methyl-1H-pyrazole-3-carbaldehyde (1.0 g, 5.18 mmol) in 1,4-dioxane (20 mL), was added (4-fluorophenyl)boronic acid (894 mg, 6.26 mmol), cesium carbonate (3.5 g, 10.7 mmol), Pd(dppf)Cl2.CH2Cl2 (435 mg, 0.53 mmol) and water (5 mL). The resulting mixture was stirred for 3 h at 90° C. and cooled to room temperature. The reaction mixture was poured into water (50 mL) and then extracted with ethyl acetate (3×30 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 50:50 ethyl acetate/petroleum ether) to afford 4-(4-fluorophenyl)-1-methyl-1H-pyrazole-3-carbaldehyde as a light brown solid (900 mg, 85%). LCMS (ES, m/z): 205 [M+H]+.
To a solution of n-BuLi (8.5 mL, 2.5 M in heptane) was added n-Bu2Mg (21 mL, 1.0 M in hexane). The resulting mixture was stirred for 30 min at room temperature. This was followed by the dropwise addition of a solution of 7-bromo-3,4-dihydro-2H-1-benzopyran (3.0 g, 13.8 mmol) in tetrahydrofuran (25 mL) dropwise with stirring at −10° C. The resulting mixture was stirred for 2 h at −10° C. and was then slowly added to a solution of sulfuryl dichloride (25 mL) in toluene (25 mL) at −10° C. The resulting mixture was stirred for 30 min at −10° C. The reaction was then quenched by the careful addition saturated aqueous ammonium chloride solution (100 mL) at 0° C. The resulting solution was extracted with ethyl acetate (3×100 mL). The organic layers were combined, dried over anhydrous sodium sulfate, filtered and concentrated under vacuum. The resulting crude product was purified by silica gel column (eluting with 0:100 to 30:70 ethyl acetate/petroleum ether) to afford 3,4-dihydro-2H-1-benzopyran-7-sulfonyl chloride as a yellow oil (2.5 g, 78%). GCMS (ES): 232 [M]+.
To a solution of 3-bromophenol (10 g, 57.2 mmol) in acetic anhydride (17.4 mL, 184 mmol) was added sulfuric acid (0.2 mL). The resulting mixture was stirred for 18 h at 25° C. The reaction mixture was poured into hydrochloric acid (100 mL, 2 wt %) and then extracted with ethyl acetate (3×100 mL). The combined organic layers were washed with sodium bicarbonate solution (2 N) twice and brine. The solution was dried over anhydrous sodium sulfate, filtered and concentrated under vacuum to afford 3-bromophenyl acetate as a colorless oil (13 g, crude). LCMS (ES, m/z): 215, 217 [M+H]+.
To 3-bromophenyl acetate (13 g, 56.2 mmol) was added trichloroaluminum (12 g, 90.0 mmol). The resulting mixture was stirred for 2 h at 145° C. After cooling to room temperature, the reaction mixture was poured into hydrochloric acid (32 mL, 5 wt %) and then extracted with DCM (3×50 mL). The combined organic layers were washed with sodium hydroxide (100 mL, 5 N). The aqueous layer was acidified to pH=2 with concentrated hydrochloric acid and then extracted with ethyl acetate (5×50 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered and concentrated under vacuum to afford 1-(2-bromo-6-hydroxyphenyl)ethan-1-one as a white solid (7.4 g, 61%). LCMS (ES, m/z): 215, 217 [M+H]+.
To 1-(2-bromo-6-hydroxyphenyl)ethan-1-one (3 g, 13.0 mmol) was added ammonia solution (15 mL, 7 M in methanol). The resulting mixture was stirred for 3 h at 25° C. The solids were collected by filtration, washed with diethyl ether and then dissolved with THF (20 mL). The reaction was treated with N-Chlorosuccinimide (2.1 g, 15.7 mmol) and potassium carbonate (2.85 g, 20.5 mmol). The resulting mixture was stirred for 18 h at 25° C. The reaction mixture was poured into water (50 mL) and then extracted with ethyl acetate (3×50 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 20/80 ethyl acetate/petroleum ether) to afford 4-bromo-3-methyl-1,2-benzoxazole as a yellow solid (1.8 g, 65%). LCMS (ES, m/z): 212, 214 [M+H]+.
To a solution of morpholine (1.53 g, 17.2 mmol) in DMF (30 mL), was added methyl 2-chloropyridine-4-carboxylate (2.00 g, 11.4 mmol), and potassium carbonate (3.20 g, 22.7 mmol). The resulting mixture was stirred for 18 h at 100° C. and then cooled to room temperature. The reaction mixture was poured into water (30 mL) and then extracted with ethyl acetate (3×50 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 50:50 ethyl acetate/petroleum ether) to afford methyl 2-(morpholin-4-yl)pyridine-4-carboxylate as a yellow oil (375 mg, 15%). LCMS (ES, m/z): 223 [M+H]+.
To a solution of methyl 2-(morpholin-4-yl)pyridine-4-carboxylate (375 mg, 1.65 mmol) in tetrahydrofuran (3 mL), was added lithium aluminium hydride (2.1 mL, 1M in THF) dropwise at −10° C. The resulting mixture was stirred for 15 min at −10° C. and quenched by careful addition of Na2SO4.10H2O (500 mg). The resulting mixture was filtered and concentrated under vacuum to afford [2-(morpholin-4-yl)pyridin-4-yl]methanol as a yellow oil (210 mg, 65%). LCMS (ES, m/z): 195 [M+H]+.
To a solution of [2-(morpholin-4-yl)pyridin-4-yl]methanol (150 mg, 0.77 mmol) in dichloromethane (2 mL), was added DMP (120 mg, 0.85 mmol) at 0° C. The resulting mixture was stirred for 18 h at room temperature. The reaction mixture was poured into water (2 mL) and then extracted with ethyl acetate (3×3 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum to afford 2-(morpholin-4-yl)pyridine-4-carbaldehyde as a yellow oil (130 mg, 88%). LCMS (ES, m/z): 193 [M+H]+.
To a solution of 2-(1,2-benzoxazol-3-yl)acetic acid (2.50 g, 14.1 mmol) in acetic acid (25 mL) was added bromine (0.74 mL, 14.4 mmol) at 0° C. The resulting mixture was stirred for 16 h at room temperature. The reaction mixture was concentrated under vacuum. The resulting solid was washed with DCM and dried under vacuum to afford 2-(1,2-benzoxazol-3-yl)-2-bromoacetic acid as a light yellow solid (2.60 g, 72%). LCMS (ES, m/z): 256, 258 [M+H]+.
To a solution of 2-(1,2-benzoxazol-3-yl)-2-bromoacetic acid (2.60 g, 10.2 mmol) in diethyl ether (30 mL) was added thionyl chloride (3.66 mL, 50.4 mmol). The resulting solution was stirred for 15 min at 40° C. Then the resulting mixture was concentrated under vacuum and then dissolved with methanol (30 mL). The resulting solution was stirred for 16 h at room temperature. The reaction mixture was poured into brine (30 mL) and then extracted with ethyl acetate (3×30 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 15:85 ethyl acetate/petroleum ether) to afford methyl 2-(1,2-benzoxazol-3-yl)-2-bromoacetate as a light yellow oil (2.00 g, 73%). LCMS (ES, m/z): 270, 272 [M+H]+.
To a solution of methyl 2-(1,2-benzoxazol-3-yl)-2-bromoacetate (2.00 g, 7.41 mmol) in methanol (30 mL) and water (15 mL) was added sodium nitrite (2.30 g, 33.3 mmol). The resulting mixture was stirred for 3 days at room temperature. The reaction mixture was poured into water (30 mL) and then extracted with ethyl acetate (3×30 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 50:50 ethyl acetate/petroleum ether) to afford methyl 2-(1,2-benzoxazol-3-yl)-2-hydroxyacetate as a light yellow oil (180 mg, 12%). LCMS (ES, m/z): 208 [M+H]+.
The Intermediates in Table 13 were synthesized according to the procedure described for Intermediate 50-1 above.
To a solution of 1-methyl-1H-indole-2-carbaldehyde (2.0 g, 12.4 mmol) in dichloromethane (40 mL) was added ZnI2 (800 mg, 2.51 mmol). This was followed by the addition of trimethylsilyl cyanide (4.97 mL, 37.3 mmol) with stirring at 0° C. The resulting solution was stirred for 2 h at 0° C. and then concentrated under vacuum to afford 2-hydroxy-2-(1-methyl-1H-indol-2-yl)acetonitrile as yellow oil (2.0 g, 86%). LCMS (ES, m/z): 187 [M+H]+.
To a solution of 2-hydroxy-2-(1-methyl-1H-indol-2-yl)acetonitrile (2.0 g, 9.67 mmol) in 1,4-dioxane (10 mL) was added aqueous sodium tetraborate decahydrate solution (60 mL, 0.5 M). The reaction mixture was stirred for 2 h at 80° C. The reaction was treated with aqueous sodium hydroxide (60 mL, 1.0 M) and stirred for 3 h at 100° C. Upon cooling to room temperature, the solution was acidified to pH=8 with concentrated hydrochloric acid. The resulting mixture was lyophilized. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 10:90 dichloromethane/methanol) to afford 2-hydroxy-2-(1-methyl-1H-indol-2-yl) acetic acid as a yellow solid (200 mg, 10%). LCMS (ES, m/z): 206 [M+H]+.
To a solution of 3-fluorobenzene-1,2-diol (10.0 g, 76.5 mmol) in N,N-dimethylformamide (150 mL) was added 1,2-dibromoethane (18.9 g, 98.6 mmol) and cesium carbonate (76.0 g, 233 mmol). The resulting mixture was stirred at 16 h at 120° C. and then cooled to room temperature. The resulting solution was poured into water (500 mL) and then extracted with ethyl acetate (3×150 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 20:80 ethyl acetate/petroleum ether) to afford 5-fluoro-2,3-dihydrobenzo[b][1,4]dioxine as a yellow oil (5 g, 43%). LCMS (ES, m/z): 155 [M+H]+.
To a solution of 5-fluoro-2,3-dihydro-1,4-benzodioxine (3.00 g, 18.5 mmol) in methanol (115 mL) was added bromine (1.2 mL, 23.0 mmol). The resulting solution was stirred for 18 h at room temperature. The reaction mixture was poured into aqueous sodium hydrogen sulfite solution (50 mL) and then extracted with ethyl acetate (3×100 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 20:80 ethyl acetate/petroleum ether) to afford 6-bromo-5-fluoro-2,3-dihydro-1,4-benzodioxine as a yellow oil (2.00 g, 44%). LCMS (ES, m/z): 233, 235 [M+H]+.
To n-Bu2Mg (13 mL, 1.0 M in hexane) was added n-BuLi (15 mL, 2.5 M in heptane). After stirring for 5 min at room temperature, the reaction was cooled to −15° C. and treated with a 6-bromo-5-fluoro-2,3-dihydrobenzo[b][1,4]dioxine (2.00 g, 8.15 mmol) in tetrahydrofuran (15 mL) at −15° C. The resulting mixture was stirred for 1 h at −15° C. and then a solution of sulfuryl dichloride (15 mL) in toluene (15 mL) was added. The resulting mixture was warmed to −10° C. and stirred for 0.5 h. The reaction mixture was poured into saturated ammonium chloride solution (50 mL) and then extracted with ethyl acetate (3×30 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 30:70 ethyl acetate/petroleum ether) to afford 5-fluoro-2,3-dihydro-1,4-benzodioxine-6-sulfonyl chloride as yellow oil (200 mg, 10%). LCMS (ES, m/z): 253, 255 [M+H]+.
To a solution of 5-fluoro-2,3-dihydro-1,4-benzodioxine-6-sulfonyl chloride (200 mg, 0.71 mmol) in dichloromethane (5 mL) was added 2-tert-butyl-1H,3H,4H,5H,6H,7H,8H-2lambda3,4,7-pyrrolo[3,4-e][1lambda3,3]oxazepin-3-one (167 mg, 0.75 mmol) and DIEA (0.26 mL, 1.55 mmol). The resulting solution was stirred for 2 h at 25° C. The reaction mixture was poured into water (15 mL) and then extracted with ethyl acetate (3×10 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 50:50 ethyl acetate/petroleum ether) to afford 2-tert-butyl-7-(5-fluoro-2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,3H,4H,5H,6H,7H,8H-2lambda3,4,7-pyrrolo[3,4-e][1lambda3,3]oxazepin-3-one as colorless oil (150 mg, 49%). LCMS (ES, m/z): 427 [M+H]+.
To a solution of 2-tert-butyl-7-(5-fluoro-2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,3H,4H,5H,6H,7H,8H-2lambda3,4,7-pyrrolo[3,4-e][1lambda3,3]oxazepin-3-one (70 mg, 0.16 mmol) in dichloromethane (5 mL) was added trifluoroacetic acid (1 mL). The resulting solution was stirred for 1 h at room temperature. The resulting mixture was concentrated under vacuum and then basified to pH=8 with saturated potassium carbonate solution. The resulting solution was extracted with dichloromethane (2×5 mL). The organic layers were combined, dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum to afford 2-(5-fluoro-2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrole as brown oil (40 mg, 76%). LCMS (ES, m/z): 327 [M+H]+.
To a solution of 3-iodobenzaldehyde (1.00 g, 4.22 mmol) in DCM (30 mL), was added ZnI2 (274 mg, 0.84 mmol) and trimethylsilyl cyanide (1.72 mL, 12.6 mmol) added dropwise with stirring at 0° C. for 3 h. The reaction was poured into water (20 mL) and then extracted with ethyl acetate (3×100 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered and concentrated under vacuum to afford 2-hydroxy-2-(3-iodophenyl)acetonitrile as yellow oil (0.8 g, 73%). LCMS (ES, m/z): 260 [M+H]+.
To a solution of 2-hydroxy-2-(3-iodophenyl)acetonitrile (1.47 g, 4.54 mmol) in 1,4-dioxane (8 mL) was added concentrated hydrochloric acid (3.5 mL). The resulting mixture was stirred for 3 h at 95° C. After cooling to room temperature, the reaction mixture was diluted with water (5 mL) and then extracted with ethyl acetate (3×20 mL). The organic layers were combined, dried over anhydrous sodium sulfate, filtered and concentrated under vacuum to afford 2-hydroxy-2-(3-iodophenyl)acetic acid as a yellow oil (750 mg, 59%). LCMS (ES, m/z): 279 [M+H]+.
The Intermediates in Table 14 were synthesized according to the procedure described for Intermediate 54-1 above.
To a solution of 5-bromo-3-fluorobenzene-1,2-diol (5.00 g, 23.7 mmol) in N,N-dimethylformamide (80 mL) was added 1,2-dibromoethane (2.72 mL, 30.8 mmol), and cesium carbonate (24.0 g, 73.7 mmol). The resulting mixture was stirred for 16 h at 120° C. and then cooled to room temperature. The reaction mixture was poured into water (150 mL) and then extracted with ethyl acetate (3×150 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 40:60 ethyl acetate/petroleum ether) to afford 7-bromo-5-fluoro-2,3-dihydro-1,4-benzodioxine as a white solid (2.80 g, 51%). GCMS (EI, m/z): 233, 235 [M+H]+.
To a stirred solution of n-BuLi (15 mL, 2.5 M in heptane) was added n-Bu2Mg (13 mL, 1.0 M in hexane). After 5 min, the reaction was cooled to −10° C. and treated with 7-bromo-5-fluoro-2,3-dihydro-1,4-benzodioxine (2.0 g, 8.15 mmol) in tetrahydrofuran (15 mL). The resulting mixture was warmed to room temperature and stirred for 1 h. To the reaction was added sulfonylchloride (15 mL) in toluene (15 mL) and stirred for 0.5 h at −10° C. The reaction mixture was poured into saturated aqueous ammonium chloride (50 mL) and extracted with ethyl acetate (3×40 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 40:60 ethyl acetate/petroleum ether) to afford 8-fluoro-2,3-dihydro-1,4-benzodioxine-6-sulfonyl chloride as an off-white solid (800 mg, 38%). LCMS (ES, m/z): 253, 255 [M+H]+.
To a solution of methyl tert-butyl 1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrole-2-carboxylate (1.00 g, 4.52 mmol) in dichloromethane (10 mL) was added DIEA (1.97 mL, 11.9 mmol). The reaction was treated with 8-fluoro-2,3-dihydro-1,4-benzodioxine-6-sulfonyl chloride (1.00 g, 3.80 mmol) in DCM (5 mL) added dropwise with stirring. The resulting mixture was stirred for 3 h at room temperature and then poured into water (50 mL). The product was extracted with ethyl acetate (3×50 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The crude product was purified by silica gel chromatography (eluting with 0:100 to 50:50 ethyl acetate/petroleum ether) to afford tert-butyl 5-[(8-fluoro-2,3-dihydro-1,4-benzodioxin-6-yl)sulfonyl]-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrole-2-carboxylate as a white solid (1.20 g, 74%). LCMS (ES, m/z): 427 [M+H]+.
To a solution of tert-butyl 5-[(8-fluoro-2,3-dihydro-1,4-benzodioxin-6-yl)sulfonyl]-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrole-2-carboxylate (500 mg, 1.15 mmol) in dichloromethane (5 mL) was added trifluoroacetic acid (1 mL). The resulting solution was stirred for 1 h at room temperature and concentrated under vacuum to afford 2-[(8-fluoro-2,3-dihydro-1,4-benzodioxin-6-yl)sulfonyl]-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrole TFA salt as a brown solid (400 mg, crude). LCMS (ES, m/z): 327 [M+H]+.
To a solution of 6-bromo-3,4-dihydro-2H-1,4-benzoxazine (5.00 g, 20.1 mmol) in CH3CN (150 mL) was added paraformaldehyde (3.26 g, 40.2 mmol) and sodium cyanoborohydride (2.30 g, 36.49 mmol). The resulting mixture was stirred for 15 min at 0° C. The reaction was treated with acetic acid (5 mL) and stirred for 16 h at room temperature. The reaction was quenched with water (50 mL) and then extracted with ethyl acetate (3×150 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 80:20 ethyl acetate/petroleum ether) to afford 6-bromo-4-methyl-3,4-dihydro-2H-1,4-benzoxazine as a red oil (2.50 g, 55%). LCMS (ES, m/z): 228, 230 [M+H]+.
To a solution of 6-bromo-4-methyl-3,4-dihydro-2H-1,4-benzoxazine (2.50 g, 11.0 mmol) in THF (25 mL) was added n-BuLi (13.2 mL, 2.5 M in n-hexane) dropwise with stirring at −78° C. After 15 min diethyl oxalate (4.46 mL, 33.0 mmol) was added and stirring continued for 2 h. The reaction was poured into saturated aqueous ammonium chloride (10 mL). The product was extracted with ethyl acetate (3×25 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 10:90 ethyl acetate/petroleum ether) to afford ethyl 2-(4-methyl-3,4-dihydro-2H-1,4-benzoxazin-6-yl)-2-oxoacetate as a yellow oil (500 mg, 18%). LCMS (ES, m/z): 250 [M+H]+.
To a solution of ethyl 2-(4-methyl-3,4-dihydro-2H-1,4-benzoxazin-6-yl)-2-oxoacetate (250 mg, 1.00 mmol) in tetrahydrofuran (10 mL) was added sodium borohydride (57 mg, 1.51 mmol). The resulting mixture was stirred for 10 min at 0° C. and then poured into water (10 mL). The product was extracted with ethyl acetate (3×10 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The crude product was purified by silica gel chromatography (eluting with 0:100 to 20:80 ethyl acetate/petroleum ether) to afford ethyl 2-hydroxy-2-(4-methyl-3,4-dihydro-2H-1,4-benzoxazin-6-yl)acetate as a colorless oil (180 mg, 71%). LCMS (ES, m/z): 252 [M+H]+.
To a solution of ethyl 2-hydroxy-2-(4-methyl-3,4-dihydro-2H-1,4-benzoxazin-6-yl)acetate (180 mg, 0.72 mmol) in tetrahydrofuran (2 mL) and water (2 mL) was added lithium hydroxide (87 mg, 3.63 mmol). The resulting mixture was stirred for 16 h at room temperature. The reaction mixture was washed with diethyl ether (1×8 mL) and then concentrated under vacuum to afford lithium 2-hydroxy-2-(4-methyl-3,4-dihydro-2H-1,4-benzoxazin-6-yl)acetate as a yellow oil (100 mg, 16%). LCMS (ES, m/z): 224 [M+H]+.
To a solution of 5-bromo-2-methoxyphenol (10.0 g, 48.3 mmol) in DMSO (150 mL) was added 1,2-dibromo-1,1,2,2-tetrafluoroethane (26 g, 98.1 mmol) and potassium carbonate (10.0 g, 70.9 mmol). The resulting mixture was stirred for 16 h at 100° C. and then cooled to room temperature. The reaction mixture was poured into water (200 mL) and then extracted with ethyl acetate (3×150 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The crude product was purified by silica gel chromatography (eluting with 0:100 to 20:80 ethyl acetate/petroleum ether) to afford 4-bromo-2-(2-bromo-1,1,2,2-tetrafluoroethoxy)-1-methoxybenzene as light a yellow oil (15.0 g, 81%). GCMS (EI, m/z): 380, 382 [M+H]+.
To a solution of 4-bromo-2-(2-bromo-1,1,2,2-tetrafluoroethoxy)-1-methoxybenzene (10 g, 25.1 mmol) in acetic acid (72 mL) was added hydrobromic acid (28 mL, 48% in acetic acid). The resulting mixture was stirred for 16 h at 120° C. and then cooled to room temperature. The reaction mixture was poured into water (200 mL) and then extracted with ethyl acetate (3×150 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 40:60 ethyl acetate/petroleum ether) to afford 8-fluoro-2,3-dihydro-1,4-benzodioxine-6-sulfonyl chloride as a yellow oil (5.0 g, 54%). GCMS (EI, m/z): 366, 368, 370 [M+H]+.
To a solution of 4-bromo-2-(2-bromo-1,1,2,2-tetrafluoroethoxy)-1-methoxybenzene (4.0 g, 10.3 mmol) in MeOH (6 mL) was added potassium methoxide (1.08 g, 15.4 mmol). The resulting mixture was stirred for 0.5 h at room temperature and concentrated under vacuum. The residue was dissolved in tetrahydrothiophene 1,1-dioxide (20 mL). The resulting solution was stirred for 14 h at 140° C. and then cooled to room temperature. The reaction mixture was poured into water (20 mL) and then extracted with ethyl acetate (3×20 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 20:80 ethyl acetate/petroleum ether) to afford 6-bromo-2,2,3,3-tetrafluoro-2,3-dihydro-1,4-benzodioxine as a light yellow oil (200 mg, 7%). GCMS (EI, m/z): 286, 288 [M+H]+.
To a solution of n-BuLi (0.63 mL, 2.5 M in heptane) was added n-Bu2Mg (1.57 mL, 1.0 M in hexane). The resulting mixture was stirred for 10 min at room temperature before adding 6-bromo-2,2,3,3-tetrafluoro-2,3-dihydro-1,4-benzodioxine (300 mg, 0.94 mmol) in tetrahydrofuran (1 mL) dropwise with stirring at −10° C. The resulting mixture was warmed to room temperature and stirred for 2 h. The reaction was added to a cooled solution of sulfonylchloride (1.7 mL) in toluene (3 mL) dropwise with stirring at −10° C. The resulting mixture was stirred for 0.5 h and then poured into saturated aqueous ammonium chloride (15 mL). The product was extracted with ethyl acetate (3×10 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 40:60 ethyl acetate/petroleum ether) to afford 2,2,3,3-tetrafluoro-2,3-dihydro-1,4-benzodioxine-6-sulfonyl chloride as a light yellow oil (120 mg, 42%). GCMS (EI, m/z): 306 [M+H]+.
To a solution of 2,2,3,3-tetrafluoro-2,3-dihydro-1,4-benzodioxine-6-sulfonyl chloride (100 mg, 0.29 mmol) in dichloromethane (2 mL) was added DIEA (0.11 mL, 0.65 mmol) and 2-tert-butyl-1H,3H,4H,5H,6H,7H,8H-2lambda3,4,7-pyrrolo[3,4-e][1lambda3,3]oxazepin-3-one (69 mg, 0.31 mmol) in DCM (5 mL) added dropwise with stirring. The resulting mixture was stirred for 14 h at room temperature. The reaction mixture was poured into water (10 mL) and then extracted with ethyl acetate (3×10 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 50:50 ethyl acetate/petroleum ether) to afford tert-butyl 5-[(2,2,3,3-tetrafluoro-2,3-dihydro-1,4-benzodioxin-6-yl)sulfonyl]-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrole-2-carboxylate as a yellow solid (60 mg, 42%). LCMS (ES, m/z): 481 [M+H]+.
To a solution of tert-butyl 5-[(2,2,3,3-tetrafluoro-2,3-dihydro-1,4-benzodioxin-6-yl)sulfonyl]-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrole-2-carboxylate (40 mg, 0.08 mmol) in dichloromethane (5 mL) was added trifluoroacetic acid (1 mL). The resulting solution was stirred for 1 h at room temperature and concentrated under vacuum to afford 2-[(2,2,3,3-tetrafluoro-2,3-dihydro-1,4-benzodioxin-6-yl)sulfonyl]-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrole TFA salt as yellow oil (50 mg, crude). LCMS (ES, m/z): 381 [M+H]+.
To a solution of ethyl 5-bromo-1-methyl-1H-pyrazole-3-carboxylate (1.00 g, 4.20 mmol) in 1,4-dioxane (12 mL) was added (4-fluorophenyl)boronic acid (724 mg, 5.07 mmol), potassium carbonate (1.19 g, 8.61 mmol), Pd(dppf)Cl2.CH2Cl2 (352 mg, 0.43 mmol) and water (4 mL). The mixture was stirred for 3 h at 100° C., cooled to room temperature and then poured into water (5 mL). The product was extracted with ethyl acetate (3×15 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 50:50 ethyl acetate/petroleum ether) to afford ethyl 5-(4-fluorophenyl)-1-methyl-1H-pyrazole-3-carboxylate as a yellow solid (900 mg, 86%). LCMS (ES, m/z): 249 [M+H]+.
To a solution of ethyl 5-(4-fluorophenyl)-1-methyl-1H-pyrazole-3-carboxylate (900 mg, 3.55 mmol) in THF (5 mL) was added lithium aluminium hydride (152 mg, 4.00 mmol) at 0° C. The resulting mixture was stirred for 5 min at 0° C. The reaction was then quenched by careful addition of Na2SO4.10H2O (500 mg). The resulting mixture was filtered and concentrated under vacuum to afford (5-(4-fluorophenyl)-1-methyl-1H-pyrazol-3-yl)methanol as a yellow solid (700 mg, 96%). LCMS (ES, m/z): 207 [M+H]+.
To a solution of (5-(4-fluorophenyl)-1-methyl-1H-pyrazol-3-yl)methanol (650 mg, 2.99 mmol) in dichloromethane (15 mL) was added DMP (2.67 g, 6.23 mmol) at 0° C. The resulting mixture was stirred for 3 h at 25° C. The reaction mixture was poured into water (5 mL) and then extracted with ethyl acetate (3×15 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 50:50 ethyl acetate/petroleum ether) to afford ethyl 5-(4-fluorophenyl)-1-methyl-1H-pyrazole-3-carbaldehyde as an off-white solid (600 mg, 98%). LCMS (ES, m/z): 205 [M+H]+.
The Intermediates in Table 15 were synthesized according to the procedure described for Intermediate 58-1 above.
To a solution of 2-(2,6-dibromophenyl)ethan-1-ol (600 mg, 2.14 mmol) in 1,4-dioxane (10 mL) was added cuprous iodide (41 mg, 0.22 mmol), and lithium t-butoxide (520 mg, 6.50 mmol). The mixture was stirred for 2 days at 110° C. and then cooled to room temperature. The reaction mixture was filtered and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 5:95 ethyl acetate/petroleum ether) to afford 4-bromo-2,3-dihydro-1-benzofuran as a yellow oil (0.3 g, 45%). GCMS (EI, m/z): 198, 200 [M]+.
To a solution of 4-bromo-2,3-dihydro-1-benzofuran (800 mg, 2.57 mmol) in THF (20 mL) was added n-BuLi (2 mL, 2.5 M in n-hexane) dropwise with stirring at −78° C. After stirring for 10 min at −78° C., DMF (0.40 mL, 5.20 mmol) was added and stirred for 1 h. The reaction mixture was poured into saturated aqueous ammonium chloride (10 mL) and then extracted with ethyl acetate (3×20 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by prep-TLC (eluting with 1:5 ethyl acetate/petroleum ether) to afford 2,3-dihydro-1-benzofuran-4-carbaldehyde as a yellow oil (410 mg, 97%). LCMS (ES, m/z): 149 [M+H]+.
To a stirred solution of methyl 2-hydroxy-2-(2-methyl-1,3-benzoxazol-4-yl)acetate (600 mg, 2.71 mmol) in dichloromethane (15 mL) was added DMP (1.27 g, 2.99 mmol). After 16 h, the reaction mixture was poured into brine (5 mL) and then extracted with ethyl acetate (3×20 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum to afford methyl 2-(2-methyl-1,3-benzoxazol-4-yl)-2-oxoacetate as a light yellow oil (400 mg, 73%). LCMS (ES, m/z): 220 [M+H]+.
To a solution of methyl 2-(2-methyl-1,3-benzoxazol-4-yl)-2-oxoacetate (300 mg, 1.37 mmol) in acetic acid (6 mL) was added phenylhydrazine (178 mg, 1.65 mmol), and zinc powder (891 mg, 13.6 mmol). The resulting mixture was stirred for 2 d. The reaction was filtered and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 4:96 MeOH/DCM) to afford methyl 2-amino-2-(2-methyl-1,3-benzoxazol-4-yl)acetate as a brown oil (200 mg, 66%). LCMS (ES, m/z): 221 [M+H]+.
To a solution of methyl 2-amino-2-(2-methyl-1,3-benzoxazol-4-yl)acetate (100 mg, 0.45 mmol) in dichloromethane (2 mL) was added acetic anhydride (0.05 mL, 0.55 mmol), and TEA (0.19 mL, 1.36 mmol). The resulting mixture was stirred for 1 h at room temperature and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 10:90 ethyl acetate/petroleum ether) to afford methyl 2-acetamido-2-(2-methyl-1,3-benzoxazol-4-yl)acetate as a light yellow oil (90 mg, 76%). LCMS (ES, m/z): 263 [M+H]+.
To a solution of methyl 2-acetamido-2-(2-methyl-1,3-benzoxazol-4-yl)acetate (90 mg, 0.34 mmol) in tetrahydrofuran (0.75 mL) and water (0.75 mL) was added lithium hydroxide (83 mg, 3.47 mmol). The resulting mixture was stirred for 16 h. The reaction mixture was washed with diethyl ether (1×8 mL) and then acidified to pH=5 with saturated citric acid. The resulting solution was extracted with ethyl acetate (2×8 mL). The organic layers were combined, dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum to afford 2-acetamido-2-(2-methyl-1,3-benzoxazol-4-yl)acetic acid as a light yellow oil (70 mg, 82%). LCMS (ES, m/z): 249 [M+H]+.
To a solution of 3-bromophenol (10 g, 57.2 mmol) in acetic anhydride (17.4 mL, 184 mmol) was added sulfuric acid (0.2 mL). The resulting mixture was stirred for 18 h. The reaction mixture was poured into hydrochloric acid (100 mL, 2 wt %) and then extracted with ethyl acetate (3×100 mL). The combined organic layers were washed with aqueous sodium bicarbonate (2 N) twice and brine, dried over anhydrous sodium sulfate, filtered and concentrated under vacuum to afford 3-bromophenyl acetate as a colorless oil (13 g, crude). LCMS (ES, m/z): 215, 217 [M+H]+.
To 3-bromophenyl acetate (13 g, 56.2 mmol) was added trichloroalumane (12 g, 90.0 mmol). The resulting mixture was stirred for 2 h at 145° C. After cooling to room temperature, the reaction mixture was poured into hydrochloric acid (32 mL, 5 wt %) and extracted with DCM (3×50 mL). The combined organic layers were washed with sodium hydroxide (100 mL, 5 N). The aqueous layer was acidified to pH=2 with concentrated hydrochloric acid and then extracted with ethyl acetate (5×50 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered and concentrated under vacuum to afford 1-(2-bromo-6-hydroxyphenyl)ethan-1-one as a white solid (7.4 g, 61%). LCMS (ES, m/z): 215, 217 [M+H]+.
To 1-(2-bromo-6-hydroxyphenyl)ethan-1-one (3 g, 13.0 mmol) was added ammonia solution (15 mL, 7 M in methanol). The resulting mixture was stirred for 3 h at 25° C. The generated solids were collected by filtration, washed with diethyl ether and then dissolved with THF (20 mL). Then N-Chlorosuccinimide (2.1 g, 15.7 mmol) and potassium carbonate (2.85 g, 20.5 mmol) was added. The resulting mixture was stirred for 18 h at 25° C. The reaction mixture was poured into water (50 mL) and then extracted with ethyl acetate (3×50 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 20/80 ethyl acetate/petroleum ether) to afford 4-bromo-3-methyl-1,2-benzoxazole as a yellow solid (1.8 g, 65%). LCMS (ES, m/z): 212, 214 [M+H]+.
To a solution of 4-bromo-3-methyl-1,2-benzoxazole (1.72 g, 8.11 mmol) in 1,2-dioxane (20 mL) was added Pd(PPh3)4(938 mg, 0.81 mmol), and (tributylstannyl)methanol (3.39 g, 10.6 mmol). The resulting mixture was stirred for 16 h at 100° C. After cooling to room temperature, the reaction mixture was poured into saturated aqueous ammonium chloride (10 mL) and then extracted with ethyl acetate (3×10 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 20/80 ethyl acetate/petroleum ether) to afford (3-methyl-1,2-benzoxazol-4-yl)methanol as a light yellow oil (900 mg, 68%). LCMS (ES, m/z): 164 [M+H]+.
To a solution of oxalyl chloride (1.40 g, 11.1 mmol) in dichloromethane (10 mL) was added DMSO (1.17 mL, 16.5 mmol) dropwise with stirring at −78° C. The reaction was treated with 1,2-benzoxazol-4-ylmethanol (900 mg, 6.03 mmol) in DCM (5 mL). After 2 h, TEA (4.60 mL, 33.1 mmol) was added. The resulting mixture was warmed to room temperature for 2 h. The reaction mixture was poured into brine (5 mL) and then extracted with dichloromethane (3×10 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 1:5 ethyl acetate/petroleum ether) to afford 3-methyl-1,2-benzoxazole-4-carbaldehyde as a colorless oil (370 mg, 38%). LCMS (ES, m/z): 162 [M+H]+.
In a dry 25 ml RBF under N2 was added 2-((2,3-dihydrobenzo[b][1,4]dioxin-6-yl)sulfonyl)-1,2,3,4,5,6-hexahydropyrrolo[3,4-c]pyrrole (200 mg, 0.649 mmol), (R)-3-((tert-butoxycarbonyl)amino)-2-phenylpropanoic acid (189 mg, 0.713 mmol), DMF (1 mL), DIEA (170 μl, 0.973 mmol) and HATU (271 mg, 0.713 mmol). After 3 h, the reaction was diluted with 50 ml of saturated aqueous bicarbonate solution (50 mL) and extracted with EtOAc (4×20 mL). The extracts were dried over Na2SO4, filtered and the solvent was removed in vacuo to afford 524 mg of a brown gummy solid. The crude material was purified by a Biotage SNAP-25 Silica column and eluted with an EtOAc/Hexane gradient (0-100% EtOAc). The desired product was isolated affording 309 mg of a white solid.
The Intermediates in Table 16 were synthesized according to the procedure described for Intermediate 63-1 above.
To a solution of (2S)-2-(3-bromophenyl)-1-[5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl]-2-hydroxyethan-1-one (100 mg, 0.20 mmol) in toluene (5 mL) was added tert-butyl octahydropyrrolo[3,4-c]pyrrole-2-carboxylate (609 mg, 2.87 mmol), RuPhos 2G (15 mg, 0.02 mmol), RuPhos (18 mg, 0.04 mmol), and cesium carbonate (189 mg, 0.58 mmol). The resulting mixture was stirred overnight at 100° C. After cooling to room temperature, the reaction was concentrated under vacuum. The crude product was purified by silica gel chromatography (eluting with 1:25 MeOH/DCM) to afford tert-butyl 5-[3-[(1S)-2-[5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl]-1-hydroxy-2-oxoethyl]phenyl]-octahydropyrrolo-[3,4-c]pyrrole-2-carboxylate as a light yellow solid (100 mg, 80%). LCMS (ES, m/z): 653 [M+H]+.
The Intermediates in Table 18 were synthesized according to the procedure described for Intermediate 66 above.
To a solution of 2-(1,2-benzoxazol-3-yl)acetic acid (3 g, 16.9 mmol) in acetic acid (30 mL), was added bromine (3.21 g, 20.1 mmol) at 0-10° C. The solution was stirred for 16 h at room temperature and then concentrated under vacuum. The crude product was washed with DCM and dried under vacuum to afford 2-(1,2-benzoxazol-3-yl)-2-bromoacetic acid as an off-white solid (3.2 g, 74%). LCMS (ES, m/z): 509, 511, 513 [2M−H]−.
To a solution of 2-(1,2-benzoxazol-3-yl)-2-bromoacetic acid (500 mg, 1.95 mmol) in methanol (5 mL) was added ammonia (15 mL, 7 M in MeOH). The resulting solution was stirred for 16 h at 40° C. and then concentrated under vacuum. The crude product was washed with MeOH and dried under vacuum to afford 2-amino-2-(1,2-benzoxazol-3-yl)acetic acid as an off-white solid (0.7 g, 47%). LCMS (ES, m/z): 193 [M+H]+.
To a solution of 2-amino-2-(1,2-benzoxazol-3-yl) acetic acid (600 mg, 3.12 mmol) in MeOH (25 mL) and water (5 mL), was added sodium hydroxide (500 mg, 12.5 mmol) and acetic anhydride (1.59 g, 15.6 mmol) at 0° C. The mixture was stirred for 30 min at 0° C. and concentrated under vacuum. The crude product was purified by reversed phase chromatography (eluting with 0:100 to 50:50 MeCN/water (containing 10 mM NH4HCO3)) to afford 2-(1,2-benzoxazol-3-yl)-2-acetamido acetic acid as a white solid (0.6 g, 82%). LCMS (ES, m/z): 235 [M+H]+.
To a solution of methyl 2-amino-4-[[(tert-butoxy)carbonyl]amino]butanoate hydrochloride (2.00 g, 7.07 mmol) in THF (2 mL) was added water (1 mL), sodium nitrite (858 mg, 12.4 mmol), (3-chlorophenyl)boronic acid (776 mg, 4.96 mmol), and potassium formate (417 mg, 4.96 mmol). The resulting mixture was stirred for 48 h at 80° C. After cooling to room temperature, the reaction mixture was poured into saturated aqueous ammonium chloride solution (10 mL) and then extracted with ethyl acetate (3×10 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The crude product was purified by prep-TLC (eluting with 1:1 ethyl acetate/petroleum ether) to afford methyl 4-[[(tert-butoxy)carbonyl]amino]-2-(3-chlorophenyl)butanoate as yellow oil (827 mg, 36%). LCMS (ES, m/z): 328, 330 [M+H]+.
To a solution of ethyl methyl 4-[[(tert-butoxy)carbonyl]amino]-2-(3-chlorophenyl)butanoate (827 mg, 2.27 mmol) in THF (3 mL) and water (3 mL) was added lithium hydroxide (303 mg, 12.7 mmol). The resulting mixture was stirred for 18 h at room temperature. The reaction mixture was washed with diethyl ether (1×5 mL) and then acidified to pH=7 with saturated aqueous citric acid. The resulting solution was extracted with ethyl acetate (3×10 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum to afford 4-[[(tert-butoxy)carbonyl]amino]-2-(3-chlorophenyl)butanoic acid as a yellow oil (524 mg, 75%). LCMS (ES, m/z): 314, 316 [M+H]+.
To a solution of 3-fluorobenzene-1,2-diol (4.40 g, 34.4 mmol) in N,N-dimethylformamide (50 mL) was added potassium carbonate (14.3 g, 103 mmol) and 1,2-dibromoethane (14.8 mL, 172 mmol). The resulting mixture was stirred for 2 h at 80° C. and then cooled to room temperature. The reaction mixture was poured into water (50 mL) and then extracted with ethyl acetate (3×100 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 10:90 ethyl acetate/petroleum ether) to afford 5-fluoro-2,3-dihydro-1,4-benzodioxine as a yellow oil (4.30 g, 81%). LCMS (ES, m/z): 155 [M+H]+.
To a solution of 5-fluoro-2,3-dihydro-1,4-benzodioxine (4.40 g, 28.6 mmol) in methanol (40 mL) was added NBS (5.09 g, 28.6 mmol). The resulting mixture was stirred for 1 h at 65° C. After cooling to room temperature, the reaction mixture was concentrated under vacuum. The reaction was poured into water (20 mL) and extracted with ethyl acetate (3×30 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 10:90 ethyl acetate/petroleum ether) to afford 7-bromo-5-fluoro-2,3-dihydro-1,4-benzodioxine as a light yellow solid (5.00 g, 75%). LCMS (ES, m/z): 233, 235 [M+H]+.
To a solution of 7-bromo-5-fluoro-2,3-dihydro-1,4-benzodioxine (2.00 g, 8.58 mmol) in tetrahydrofuran (20 mL), was added n-BuLi (3.62 mL, 2.5 M in hexane) dropwise at −78° C. After stirring for 30 min at −78° C., SO2 (g) was bubbled through the solution in for 30 min. The mixture was warmed to 20° C., stirred for 15 min and concentrated under vacuum. The residue was dissolved in dichloromethane (20 mL) and treated with NCS (1.26 g, 9.44 mmol). After 45 min at 0 degrees, the reaction was poured into water (20 mL) and then extracted with ethyl acetate (3×30 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 100:0 ethyl acetate/petroleum ether) to afford 8-fluoro-2,3-dihydro-1,4-benzodioxine-6-sulfonyl chloride as a yellow solid (1.20 g, 55%). LCMS (ES, m/z): 253, 255 [M+H]+.
To a solution of tert-butyl 1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrole-2-carboxylate (138 mg, 0.66 mmol) in dichloromethane (3 mL), was added triethylamine (0.27 mL, 1.98 mmol) and 8-fluoro-2,3-dihydro-1,4-benzodioxine-6-sulfonyl chloride (200 mg, 0.79 mmol). The solution was stirred for 1 h at room temperature and concentrated under vacuum. The crude product was purified by silica gel chromatography (eluting with 0:100 to 100:0 ethyl acetate/petroleum ether) to afford tert-butyl 5-(8-fluoro-2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrole-2-carboxylate as a yellow solid (340 mg, 77%). LCMS (ES, m/z): 427 [M+H]+.
To a solution of tert-butyl 5-(8-fluoro-2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrole-2-carboxylate (340 mg, 0.61 mmol) in dichloromethane (5 mL) was added trifluoroacetic acid (1 mL). The resulting solution was stirred for 1 h at room temperature. The resulting mixture was concentrated under vacuum to afford 2-(8-fluoro-2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrole as a brown oil (60 mg, 30%). LCMS (ES, m/z): 327 [M+H]+.
To a solution of 6-bromo-3,4-dihydro-2H-1,4-benzoxazine (1.40 g, 6.54 mmol) in dichloromethane (10 mL) was added di-tert-butyl dicarbonate (1.71 g, 7.84 mmol), 4-dimethylaminopyridine (80 mg, 0.65 mmol) and TEA (1.81 mL, 13.0 mmol). The resulting solution was stirred overnight at room temperature and concentrated under vacuum. The resulting crude product was purified by prep-TLC (eluting with 1:5 ethyl acetate/petroleum ether) to afford tert-butyl 6-bromo-2,3-dihydrobenzo[b][1,4]oxazine-4-carboxylate as a white solid (1.40 g, 68%). LCMS (ES, m/z): 314, 316 [M+H]+.
To a solution of tert-butyl 6-bromo-2,3-dihydrobenzo[b][1,4]oxazine-4-carboxylate (3.13 g, 9.96 mmol) in tetrahydrofuran (40 mL) was added n-butyllithium (12 mL, 2.50 M in hexane) dropwise with stirring at −78° C. The resulting solution was stirred for 30 min and treated with N,N-dimethylformamide (23.8 mL, 308 mmol). The resulting solution was warmed to room temperature and stirred for 1 h before pouring the contents into water (50 mL). The product was extracted with ethyl acetate (3×50 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 10:90 ethyl acetate/petroleum ether) to afford tert-butyl 6-formyl-2,3-dihydrobenzo[b][1,4]oxazine-4-carboxylate as a light yellow oil (1.80 g, 69%). LCMS (ES, m/z): 264 [M+H]+.
To a solution of tert-butyl 3-oxopyrrolidine-1-carboxylate (5 g, 27.0 mmol) in 1,4-dioxane (50 mL) was added (dimethoxymethyl)dimethylamine (7.80 mL, 1.74 mol). The solution was stirred overnight at 100° C. and cooled to room temperature. The resulting mixture was treated with hexane (200 mL). The solids were collected by filtration and dried under vacuum to afford tert-butyl (3Z)-3-[(dimethylamino)methylidene]-4-oxopyrrolidine-1-carboxylate as a yellow solid (3.5 g, 51%). LCMS (ES, m/z): 241 [M+H]+.
To a solution of tert-butyl (3Z)-3-[(dimethylamino)methylidene]-4-oxopyrrolidine-1-carboxylate (2.5 g, 10.40 mmol) in ethanol (20 mL) was added hydrazine (0.65 mL, 20.8 mmol). The resulting solution was stirred for 48 h at 90° C. After cooling to room temperature, the mixture was concentrated under vacuum and washed with hexane to afford tert-butyl 2H,4H,5H,6H-pyrrolo[3,4-c]pyrazole-5-carboxylate as a red oil (620 mg, 28%). LCMS (ES, m/z): 210 [M+H]+.
To a solution of tert-butyl 2H,4H,5H,6H-pyrrolo[3,4-c]pyrazole-5-carboxylate (268 mg, 1.28 mmol) in tetrahydrofuran (6 mL) was added sodium hydride (77 mg, 1.92 mmol, 60% dispersion in mineral oil) in portions at 0° C. The resulting mixture was stirred for 30 min at room temperature. Then 2,3-dihydro-1,4-benzodioxine-6-sulfonyl chloride (300 mg, 1.28 mmol) was added and stirred overnight. The reaction mixture was quenched with water (1 mL) and the product was extracted with ethyl acetate (3×2 mL). The combined organic layers were concentrated under vacuum. The crude product was purified by silica gel chromatography (eluting with 1:1 ethyl acetate/petroleum ether) to afford tert-butyl 2-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-2H,4H,5H,6H-pyrrolo[3,4-c]pyrazole-5-carboxylate as a light yellow solid (200 mg, 38%). LCMS (ES, m/z): 408 [M+H]+.
To a solution of tert-butyl 2-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-2H,4H,5H,6H-pyrrolo[3,4-c]pyrazole-5-carboxylate (300 mg, 0.74 mmol) in dichloromethane (3 mL) was added trifluoroacetic acid (0.3 mL). The solution was stirred for 2 h at room temperature and concentrated under vacuum. The reaction was rendered basic (pH=8) with saturated sodium bicarbonate solution. The solids were collected by filtration and dried under vacuum to afford 2-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-2H,4H,5H,6H-pyrrolo[3,4-c]pyrazole as a white solid (170 mg, 75%). LCMS (ES, m/z): 308 [M+H]+.
To a solution of tert-butyl 3-(hydroxymethyl)piperazine-1-carboxylate (7.00 g, 32.4 mmol) in acetonitrile (56 mL) was added TEA (9.00 mL, 64.7 mmol) and (bromomethyl)benzene (5.77 mL, 48.6 mmol). The resulting mixture was stirred for 4 h at 80° C. and then cooled to room temperature. The reaction mixture was concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 80:40 ethyl acetate/petroleum ether) to afford tert-butyl 4-benzyl-3-(hydroxymethyl)piperazine-1-carboxylate as a yellow solid (6.60 g, 67%). LCMS (ES, m/z): 307 [M+H]+.
To a solution of DMSO (2.29 mL, 32.3 mmol) in DCM (100 mL) was added oxalic dichloride (1.83 mL, 21.5 mmol) dropwise with stirring at −78° C. The reaction was treated with tert-butyl 4-benzyl-3-(hydroxymethyl)piperazine-1-carboxylate (5.50 g, 18.0 mmol) in dichloromethane at −78° C. and stirred for 1 h at −78° C. The solution was treated with TEA (12.5 mL, 89.8 mL) and warmed to room temperature. The reaction mixture was diluted with DCM (100 mL) and then washed with saturated sodium bicarbonate solution (2×100 mL). The organic layer was dried over anhydrous sodium sulfate, filtered and concentrated under vacuum to afford tert-butyl 4-benzyl-3-formylpiperazine-1-carboxylate as a yellow oil (3.5 g, 64%). LCMS (ES, m/z): 305 [M+H]+.
To a solution of tert-butyl 4-benzyl-3-formylpiperazine-1-carboxylate (3.50 g, 11.5 mmol) in DCM (80 mL) was added bis(2 methoxyethyl)aminosulfur trifluoride (17 mL, 92.0 mmol) at 0° C. The solution was stirred for 2 h at 0° C. The reaction was treated with ethanol (1.9 mL, 32.7 mmol) and stirred at 0° C. for 1 h. The contents were poured into saturated aqueous sodium bicarbonate solution (200 mL) and extracted with DCM (3×100 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 20:80 ethyl acetate/petroleum ether) to afford tert-butyl 4-benzyl-3-(difluoromethyl)piperazine-1-carboxylate as a yellow oil (2.0 g, 53%). LCMS (ES, m/z): 327 [M+H]+.
To a solution of tert-butyl 4-benzyl-3-(difluoromethyl)piperazine-1-carboxylate (500 mg, 1.53 mmol) in methanol (20 mL) was added Pd(OH)2/C (50 mg, 10 wt % Pd). The resulting mixture was stirred for 2 h at room temperature under hydrogen (2-3 atm). The reaction was purged with nitrogen gas, filtered and concentrated under vacuum to afford tert-butyl 3-(difluoromethyl)piperazine-1-carboxylate as a yellow oil (300 mg, crude). LCMS (ES, m/z): 237 [M+H]+.
To a stirred solution of tert-butyl 3-(difluoromethyl)piperazine-1-carboxylate (300 mg, 1.28 mmol) in 1,4-dioxane (5 mL) was added hydrochloric acid (5 mL, 3 N). After 4 h, the reaction was concentrated under vacuum to afford 2-(difluoromethyl)piperazine HCl salt as a white solid (300 mg, crude). LCMS (ES, m/z): 137 [M+H]+.
To a solution of 2-amino-2-phenylpropanoic acid (2.00 g, 12.1 mmol) in methanol/water (70 mL, v:v=5:1), was added sodium hydroxide (1.94 g, 48.5 mmol) and acetic anhydride (5.72 mL, 60.5 mmol) at 0° C. The resulting solution was stirred for 1 h at 0° C. The reaction mixture was acidified to pH=5-6 with saturated aqueous citric acid. The resulting solution was extracted with DCM (5×100 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum to afford 2-acetamido-2-phenylpropanoic acid as a light yellow solid (150 mg, 6%). MS (ESI, m/z): 208 [M+H]+.
To a solution of methyl 2-(3,5-dichlorophenyl)acetate (2.00 g, 8.67 mmol) in tetrahydrofuran (20 mL) was added LDA (5.5 mL, 2 M in THF) dropwise with stirring at −78° C. The solution was stirred for 30 min at −78° C. The reaction was treated with 2-iodoacetonitrile (2.30 g, 13.8 mmol) and stirred for 1 h at −78° C. The contents were poured into saturated aqueous ammonium chloride solution (50 mL) and then extracted with ethyl acetate (3×50 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The crude product was purified by silica gel chromatography (eluting with 0:100 to 20:80 ethyl acetate/petroleum ether) to afford methyl 3-cyano-2-(3,5-dichlorophenyl)propanoate as a yellow oil (1.30 g, 58%). LCMS (ES, m/z): 258, 260 [M+H]+.
To a solution of methyl 3-cyano-2-(3,5-dichlorophenyl)propanoate (1.50 g, 5.52 mmol) in methanol (20 mL) was added Raney Ni (946 mg, 11.0 mmol), and di-tert-butyl dicarbonate (6.03 g, 27.6 mmol). The resulting mixture was stirred for 4 h at room temperature under hydrogen (2-3 atm). The reaction mixture was filtered and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 20:80 ethyl acetate/petroleum ether) to afford methyl 4-[[(tert-butoxy)carbonyl]amino]-2-(3,5-dichlorophenyl)butanoate as a yellow oil (1.80 g, 90%). LCMS (ES, m/z): 362, 364 [M+H]+.
To a solution of methyl 4-[[(tert-butoxy)carbonyl]amino]-2-(3,5-dichlorophenyl)butanoate (300 mg, 0.79 mmol) in tetrahydrofuran (2 mL) and water (2 mL) was added lithium hydroxide (94 mg, 3.93 mmol). The resulting mixture was stirred for 16 h at room temperature. The reaction mixture was washed with diethyl ether (1×10 mL) and then acidified to pH=7 with saturated aqueous citric acid. The product was extracted with ethyl acetate (3×20 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum to afford 4-[[(tert-butoxy)carbonyl]amino]-2-(3,5-dichlorophenyl)butanoic acid as a yellow oil (180 mg, 66%). LCMS (ES, m/z): 348, 350 [M+H]+.
To a solution of pyrrolidin-2-one (800 mg, 9.40 mmol) in toluene (20 mL) was added sodium hydride (820 mg, 20.5 mmol, 60% dispersion in mineral oil) in portions with stirring at 0° C. The resulting mixture was stirred for 1 h at 60° C. A solution of 2-bromo-2-phenylacetic acid (2.00 g, 9.30 mmol) in toluene (20 mL) was added dropwise and stirred for an 1 h at 60° C. The reaction was cooled to room temperature and concentrated under vacuum. The residue was dissolved in water (20 mL) and rendered acidic (pH=2) with hydrochloric acid (6 N). The product was extracted with dichloromethane (5×20 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by Prep-HPLC (XBridge Prep C18 OBD Column, 5 μm, 19×150 mm; Mobile Phase, A: water (containing 5 mmol/L TFA) and B: MeCN (keep 50% B over 40 min); Flow rate: 25 mL/min; Detector: UV 254 nm). The product fractions were concentrated under vacuum to afford 2-(2-oxopyrrolidin-1-yl)-2-phenylacetic acid as a yellow oil (700 mg, 34%). LCMS (ES, m/z): 220 [M+H]+.
To a solution of 6-bromo-3,4-dihydro-2H-1,4-benzoxazine (1.40 g, 6.54 mmol) in dichloromethane (10 mL) was added di-tert-butyl dicarbonate (1.71 g, 7.84 mmol), 4-dimethylaminopyridine (80 mg, 0.65 mmol) and TEA (1.81 mL, 13.0 mmol). The solution was stirred overnight at room temperature and concentrated under vacuum. The resulting crude product was purified by prep-TLC (eluting with 1:5 ethyl acetate/petroleum ether) to afford tert-butyl 6-bromo-2,3-dihydrobenzo[b][1,4]oxazine-4-carboxylate as a white solid (1.40 g, 68%). LCMS (ES, m/z): 314, 316 [M+H]+.
To a solution of tert-butyl 6-bromo-2,3-dihydrobenzo[b][1,4]oxazine-4-carboxylate (3.13 g, 9.96 mmol) in tetrahydrofuran (40 mL) was added n-butyllithium (12 mL, 2.50 M in hexane) dropwise with stirring at −78° C. The resulting solution was stirred for 30 min before adding N,N-dimethylformamide (23.8 mL, 308 mmol). The resulting solution was warmed to room temperature and stirred for 1 h. The reaction mixture was poured into water (50 mL) and then extracted with ethyl acetate (3×50 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 10:90 ethyl acetate/petroleum ether) to afford tert-butyl 6-formyl-2,3-dihydrobenzo[b][1,4]oxazine-4-carboxylate as a light yellow oil (1.80 g, 69%). LCMS (ES, m/z): 264 [M+H]+.
To a solution of tert-butyl 6-formyl-2,3-dihydrobenzo[b][1,4]oxazine-4-carboxylate (1.20 g, 4.56 mmol) in dichloromethane (20 mL) was added trimethylsilanecarbonitrile (1.71 mL, 3.00 equiv), and ZnI2 (145 mg, 0.45 mmol). The mixture was stirred for 1 h at room temperature. The reaction was poured into water (30 mL) and then extracted with ethyl acetate (3×30 mL). The combined organic layers were washed with brine (2×30 mL), dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum to afford tert-butyl 6-[cyano(hydroxy)methyl]-3,4-dihydro-2H-1,4-benzoxazine-4-carboxylate as a yellow oil (900 mg, 68%). LCMS (ES, m/z): 291 [M+H]+.
To tert-butyl 6-(cyano(hydroxy)methyl)-2,3-dihydrobenzo[b][1,4]oxazine-4-carboxylate (600 mg, 2.07 mmol) was added hydrochloric acid (8 mL, 6 N). The resulting solution was stirred for 2 h at 60° C. After cooling to room temperature, the mixture was concentrated under vacuum to afford 2-(3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-2-hydroxyacetic acid as a yellow solid (450 mg, 70%). LCMS (ES, m/z): 210 [M+H]+.
To a solution of 2-(3-bromophenyl)acetic acid (5.00 g, 23.25 mmol) in tetrahydrofuran (100 mL) was added sodium hydride (2.23 g, 55.8 mmol, 60% dispersion in mineral oil) in portions at 0° C. The resulting mixture was stirred for 30 min at 25° C. The reaction was treated with iodomethane (8.68 mL, 139 mmol) at 0° C. and then warmed to room temperature and stirred for 30 min. The reaction mixture was poured into water (25 mL). The resulting solution was acidified to pH=6 with hydrochloric acid (6 N). The product was extracted with ethyl acetate (5×50 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered and concentrated under vacuum. The resulting crude product was purified by reversed phase chromatography (eluting with 10:90 to 38/62 MeCN/water (containing 0.05% TFA)) to afford 2-(3-bromophenyl)propanoic acid as a yellow oil (3 g, 56%). LCMS (ES, m/z): 227, 229 [M−H]−.
The two enantiomers were separated by Prep-SFC (Column: (R,R)-WHELK-O1-Kromasil, 5 μm, 100×460 mm; Mobile Phase, A: CO2 and B: EtOH (keep 15% B over 6 min); Flow rate: 40 mL/min; Detector: UV 254/220 nm; Retention time: A, 3.72 min; B, 4.23 min). The fraction of the first eluting isomer were collected and concentrated under vacuum to afford (2R)-2-(3-bromophenyl)propanoic acid as a yellow oil (1.4 g, 47%). LCMS (ES, m/z): 227, 229 [M−H]−. The fractions of the second eluting isomer were collected and concentrated under vacuum to afford (2S)-2-(3-bromophenyl)propanoic acid as a yellow oil (950 mg, 32%). LCMS (ES, m/z): 227, 229 [M−H]−.
To a solution of 4-bromo-2,3-dihydro-1H-isoindole hydrochloride (4.00 g, 17.1 mmol) in DCM (40 mL) was added triethylamine (7.17 mL, 51.6 mmol) and di-tert-butyl dicarbonate (5.62 g, 25.75 mmol). The resulting solution was stirred for 1 h at room temperature. The reaction mixture was poured into water (40 mL) and then extracted with DCM (3×40 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 10:90 ethyl acetate/petroleum ether) to afford tert-butyl 4-bromo-2,3-dihydro-1H-isoindole-2-carboxylate as a white solid (5.8 g, 85%). LCMS (ES, m/z): 242, 244 [M+H-t-Bu]+.
To a solution of tert-butyl 4-bromo-2,3-dihydro-1H-isoindole-2-carboxylate (3 g, 10.1 mmol) in THF (100 mL), was added n-BuLi (8 mL, 2.5 moL/L in hexane) at −78° C. After stirring for 1 h at −78° C., diethyl oxalate (2.73 mL, 20.2 mmol) was added dropwise with stirring. The reaction was quenched by pouring the contents into saturated aqueous ammonium chloride (50 mL) and the product was extracted with DCM (5×100 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 10:90 ethyl acetate/petroleum ether) to afford tert-butyl 4-(2-ethoxy-2-oxoacetyl)-2,3-dihydro-1H-isoindole-2-carboxylate as a yellow oil (0.95 g, 30%). LCMS (ES, m/z): 264 [M+H-t-Bu]+.
To a solution of tert-butyl 4-(2-ethoxy-2-oxoacetyl)-2,3-dihydro-1H-isoindole-2-carboxylate (650 mg, 2.04 mmol) in THF (10 mL), was added sodium borohydride (23 mg, 0.61 mmol). The resulting mixture was stirred for 10 min at room temperature and concentrated under vacuum to afford tert-butyl 4-(2-ethoxy-1-hydroxy-2-oxoethyl)-2,3-dihydro-1H-isoindole-2-carboxylate as a yellow solid (0.65 g, crude). LCMS (ES, m/z): 266 [M+H-t-Bu]+.
To a solution of tert-butyl 4-(2-ethoxy-1-hydroxy-2-oxoethyl)-2,3-dihydro-1H-isoindole-2-carboxylate (650 mg, 2.02 mmol) in THF (10 mL) and water (5 mL), was added hydroxide (146 mg, 6.10 mmol). The resulting mixture was stirred for 1 h at room temperature and concentrated under vacuum. The crude product was purified by reversed phase chromatography (eluting with water (containing 10 mmol/L NH4HCO3)) to afford lithium 2-(2-(tert-butoxycarbonyl)isoindolin-4-yl)-2-hydroxyacetate as a white solid (0.23 g, 38%). LCMS (ES, m/z): 292 [M-Li+]−.
To a solution of methyl 2-(2-methyl-1,3-benzothiazol-4-yl)prop-2-enoate (200 mg, 0.86 mmol) in tetrahydrofuran (2 mL) was added azetidine (98 mg, 1.72 mmol). The resulting mixture was stirred for 2 h at room temperature. The reaction mixture was concentrated under vacuum. The resulting crude product was purified by prep-TLC (eluting with 20:1 dichloromethane/methanol) to afford methyl 3-(azetidin-1-yl)-2-(2-methyl-1,3-benzothiazol-4-yl)propanoate as a brown oil (170 mg, 68%). LCMS (ES, m/z): 305 [M+H]+.
To a solution of 1H-indazole-3-carbaldehyde (4.0 g, 27.4 mmol) in dichloromethane (50 mL) was added di-tert-butyl dicarbonate (7.17 g, 32.9 mmol), 4-dimethylaminopyridine (334 mg, 2.73 mmol), and TEA (5.70 mL, 41.0 mmol). The resulting solution was stirred for 12 h at room temperature. The reaction mixture was poured into water (100 mL) and then extracted with ethyl acetate (3×100 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 20:80 ethyl acetate/petroleum ether) to afford tert-butyl 3-formyl-1H-indazole-1-carboxylate as a white solid (5.12 g, 76%). LCMS (ES, m/z): 247 [M+H]+.
To a solution of tert-butyl 3-formyl-1H-indazole-1-carboxylate (5.10 g, 20.7 mmol) in dichloromethane (80 mL) was added ZnI2 (660 mg, 2.07 mmol) and trimethylsilanecarbonitrile (9.08 mL, 72.6 mmol) with stirring at 0° C. The resulting solution was warmed to room temperature and stirred for 16 h. The reaction mixture was poured into water (100 mL) and then extracted with ethyl acetate (3×100 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum to afford tert-butyl 3-[cyano(hydroxy)methyl]-1H-indazole-1-carboxylate as a yellow oil (5.00 g, 88%). LCMS (ES, m/z): 346 [M+H]+.
To a solution of tert-butyl 3-[cyano(hydroxy)methyl]-1H-indole-1-carboxylate (1.00 g, 3.67 mmol) in 1,4-dioxane (10 mL) was added hydrochloric acid (10 mL, 6 N). The resulting solution was stirred for 2 h at 80° C. The mixture was concentrated under vacuum to afford 2-hydroxy-2-(1H-indol-3-yl)acetic acid as yellow oil (650 mg, 93%). LCMS (ES, m/z): 193 [M+H]+.
To a solution of 6-bromo-3,4-dihydro-2H-1,4-benzoxazine (3.00 g, 14.0 mmol) in dichloromethane (20 mL) was added triethylamine (11.9 mL, 62.3 mmol) and di-tert-butyl dicarbonate (6.12 g, 28.0 mmol). The solution was stirred for 2 h at 40° C. and concentrated under vacuum. The crude product was purified by silica gel chromatography (eluting with 0:100 to 20:80 ethyl acetate/petroleum ether) to afford tert-butyl 6-bromo-3,4-dihydro-2H-1,4-benzoxazine-4-carboxylate as a yellow oil (3.00 g, 68%). LCMS (ES, m/z): 314, 316 [M+H]+.
To a solution of tert-butyl 6-bromo-3,4-dihydro-2H-1,4-benzoxazine-4-carboxylate (1.00 g, 3.18 mmol) in tetrahydrofuran (30 mL), was added n-butyllithium (1.70 mL, 2.5 M in hexane) dropwise with stirring at −78° C. After 1 h, the reaction was treated with diethyl oxalate (0.98 mL, 6.38 mmol) added dropwise with stirring. After 3 h, the reaction was poured into saturated aqueous ammonium chloride solution (10 mL) and the product was extracted with ethyl acetate (3×20 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 20:80 ethyl acetate/petroleum ether) to afford tert-butyl 6-(2-ethoxy-2-oxoacetyl)-3,4-dihydro-2H-1,4-benzoxazine-4-carboxylate as a greenish solid (700 mg, 68%). LCMS (ES, m/z): 336 [M+H]+.
To a solution of tert-butyl 6-(2-ethoxy-2-oxoacetyl)-3,4-dihydro-2H-1,4-benzoxazine-4-carboxylate (700 mg, 2.09 mmol) in acetic acid (15 mL) was added phenylhydrazine (554 mg, 5.22 mmol). The resulting mixture was stirred for 1 h at room temperature and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 50:50 ethyl acetate/petroleum ether) to afford 6-[(1E)-2-ethoxy-2-oxo-1-(2-phenylhydrazin-1-ylidene)ethyl]-3,4-dihydro-2H-1,4-benzoxazine-4-carboxylate as a yellow solid (600 mg, 68%). LCMS (ES, m/z): 426 [M+H]+.
To a solution of 6-[(1E)-2-ethoxy-2-oxo-1-(2-phenylhydrazin-1-ylidene)ethyl]-3,4-dihydro-2H-1,4-benzoxazine-4-carboxylate (500 mg, 1.18 mmol) in acetic acid (10 mL) was added zinc powder (1.15 g, 17.5 mmol) at 0° C. The resulting mixture was stirred overnight at room temperature. The reaction mixture were filtered and concentrated under vacuum. The resulting crude product was purified by reversed phase chromatography (eluting with 0:100 to 40:60 MeCN/water (containing 0.05% NH4HCO3)) to afford tert-butyl 6-(1-amino-2-ethoxy-2-oxoethyl)-3,4-dihydro-2H-1,4-benzoxazine-4-carboxylate as a white solid (400 mg, crude). LCMS (ES, m/z): 337 [M+H]+.
To a solution of tert-butyl 6-(1-amino-2-ethoxy-2-oxoethyl)-3,4-dihydro-2H-1,4-benzoxazine-4-carboxylate (400 mg, 1.19 mmol) in dichloromethane (10 mL), was added triethylamine (0.25 mL, 1.80 mmol) and acetyl acetate (0.33 mL, 3.53 mmol). The resulting mixture was stirred for 30 min at room temperature and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 70:30 ethyl acetate/petroleum ether) to afford tert-butyl 6-(1-acetamido-2-ethoxy-2-oxoethyl)-3,4-dihydro-2H-1,4-benzoxazine-4-carboxylate as a white solid (420 mg, 93%). LCMS (ES, m/z): 379 [M+H]+.
To a solution of tert-butyl 6-(1-acetamido-2-ethoxy-2-oxoethyl)-3,4-dihydro-2H-1,4-benzoxazine-4-carboxylate (420 mg, 1.11 mmol) in tetrahydrofuran (5 mL) and water (5 mL) was added lithium hydroxide (222 mg, 5.55 mmol). The resulting mixture was stirred overnight at room temperature. The reaction mixture was washed with diethyl ether (1×10 mL) and then acidified to pH=6 with hydrochloric acid (1 N). The resulting solution was extracted with ethyl acetate (3×20 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum to afford 2-[4-[(tert-butoxy)carbonyl]-3,4-dihydro-2H-1,4-benzoxazin-6-yl]-2-acetamidoacetic acid as a yellow solid (370 mg, 95%). LCMS (ES, m/z): 351 [M+H]+.
To a solution of 2-(3-bromophenyl)-1-[5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl]-2-hydroxyethan-1-one (800 mg, 1.53 mmol) in DMF (10 mL) was added imidazole (314 mg, 4.61 mmol), tert-butyl(chloro)dimethylsilane (0.43 mL, 2.30 mmol) and DMAP (20 mg, 0.164 mmol). The resulting solution was stirred for 2 h at 70° C. and then cooled to room temperature. The reaction mixture was poured into water (10 mL) and then extracted with ethyl acetate (3×20 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 50:50 ethyl acetate/petroleum ether) to afford 2-(3-bromophenyl)-2-[(tert-butyldimethylsilyl)oxy]-1-[5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl]ethan-1-one as a light yellow oil (750 mg, 69%). LCMS (ES, m/z): 635, 637 [M+H]+.
The Intermediates in Table 19 were synthesized according to the procedure described for Intermediate 83 above.
To a solution of tert-butyl7-benzyl-9-oxo-3,7-diazabicyclo[3.3.1]nonane-3-carboxylate (5.00 g, 15.1 mmol) in dichloromethane (50 mL), was added DAST (6.0 mL, 45.4 mmol) dropwise with stirring at 0° C. The resulting solution was stirred for 18 h at room temperature. The reaction mixture was poured into ice/water (40 mL) and then extracted with dichloromethane (3×70 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 20:80 ethyl acetate/petroleum ether) to afford tert-butyl 7-benzyl-9,9-difluoro-3,7-diazabicyclo[3.3.1]nonane-3-carboxylate as a light yellow oil (600 mg, 10%). LCMS (ES, m/z): 353 [M+H]+.
To a solution of tert-butyl 7-benzyl-9,9-difluoro-3,7-diazabicyclo[3.3.1]nonane-3-carboxylate (600 mg, 1.70 mmol) in MeOH (10 mL), was added Pd(OH)2/C (60 mg, 20% Pd). The resulting mixture was stirred for 4 h at room temperature under hydrogen atmosphere (2-3 atm). The reaction mixture was filtered and concentrated under vacuum. The resulting crude product was purified by Prep-HPLC (Column: Sunfire Prep C18 OBD Column, 10 μm, 19×250 mm; Mobile Phase A: water (10 MMOL/L NH4HCO3), Mobile Phase B: MeCN; Flow rate: 20 mL/min; Gradient: 30% B to 50% B over 7 min; Detector: 254 nm). The fractions of product were concentrated under vacuum to afford tert-butyl 9,9-difluoro-3,7-diazabicyclo[3.3.1]nonane-3-carboxylate as a light yellow solid (360 mg, 72%). LCMS (ES, m/z): 263 [M+H]+.
To 2-[(tert-butyldimethylsilyl)oxy]-2-(3-{9,9-difluoro-3,7-diazabicyclo[3.3.1]nonan-3-yl}phenyl)-1-[5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl]ethan-1-one (280 mg, 0.34 mmol) was added TBAF (5 mL, 1 M in THF). The resulting solution was stirred for 30 min at room temperature. The reaction mixture was poured into water (5 mL) and then extracted with ethyl acetate (3×10 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by prep-TLC (eluting with 3:1 ethyl acetate/petroleum ether) to afford tert-butyl 7-(3-[2-[5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl]-1-hydroxy-2-oxoethyl]phenyl)-9,9-difluoro-3,7-diazabicyclo[3.3.1]nonane-3-carboxylate as a yellow oil (220 mg, 82%). LCMS (ES, m/z): 703 [M+H]+.
The Intermediates in Table 20 were synthesized according to the procedure described for Intermediate 85 above.
To a solution of ethyl 2-(diethoxyphosphoryl)-2-fluoroacetate (10.0 g, 40.5 mmol) in THF (60 mL), was added n-BuLi (16.5 mL, 2.5 M in hexane) dropwise with stirring at −78° C. After 1 h, tert-butyl N-(2-oxoethyl)carbamate (6.57 g, 40.4 mmol) in THF (10 mL) was added. The resulting mixture was stirred for 3 h at −78° C. Then the reaction mixture was poured into saturated sodium bicarbonate (100 mL) and extracted with ethyl acetate (3×100 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 20:80 ethyl acetate/petroleum ether) to afford ethyl (2E)-4-{[(tert-butoxy)carbonyl]amino}-2-fluorobut-2-enoate as a light yellow oil (4.1 g, 38%). LCMS (ES, m/z): 248 [M+H]+.
To a solution of ethyl (2E)-4-[[(tert-butoxy)carbonyl]amino]-2-fluorobut-2-enoate (2.5 g, 10.1 mmol) in DCM (100 mL) was added TFA (0.1 mL) and benzyl(methoxymethyl)[(trimethylsilyl)methyl]amine (2.64 mg, 11.1 mmol). The resulting solution was stirred for 16 h at room temperature and then concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 10:90 ethyl acetate/petroleum ether) to afford ethyl (3S,4R)-1-benzyl-4-({[(tert-butoxy)carbonyl]amino}methyl)-3-fluoropyrrolidine-3-carboxylate as a light yellow oil (1.2 g, 31%). LCMS (ES, m/z): 381 [M+H]+.
To a solution of ethyl (3S,4R)-1-benzyl-4-({[(tert-butoxy)carbonyl]amino}methyl)-3-fluoropyrrolidine-3-carboxylate (1.20 g, 3.15 mmol) in DCM (20 mL) was added TFA (10 mL). The resulting solution was stirred for 2 h at room temperature and then concentrated under vacuum. The reaction mixture was poured into saturated sodium bicarbonate (100 mL) and then extracted with dichloromethane (3×100 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum to afford (3aR,6aS)-5-benzyl-6a-fluoro-octahydropyrrolo[3,4-c]pyrrol-1-one as a white solid (510 mg, 69%). LCMS (ES, m/z): 235 [M+H]+.
To a solution of (3aR, 6aS)-5-benzyl-6a-fluoro-octahydropyrrolo[3,4-c]pyrrol-1-one (500 mg, 2.13 mmol) in THF (10 mL) was added borane (10.8 mL, 1 M in THF). The resulting solution was stirred for 16 h at 60° C. The reaction was quenched by the addition of aqueous hydrochloric acid (10 mL, 1.0 N). The resulting mixture was stirred for 2 h at 60° C. and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 10:90 MeOH/DCM) to afford (3aR,6aR)-2-benzyl-3a-fluoro-octahydropyrrolo[3,4-c]pyrrole as light a yellow oil (300 mg, 63%). LCMS (ES, m/z): 221 [M+H]+.
To a solution of (3aR,6aR)-2-benzyl-3a-fluoro-octahydropyrrolo[3,4-c]pyrrole (300 mg, 1.36 mmol) in MeOH (15 mL) was added formaldehyde (2 mL, 40% in water). The resulting solution was stirred for 30 min followed by addition of STAB (865 mg, 4.09 mmol). The resulting mixture was stirred for 16 h at room temperature and then concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 10:90 MeOH/DCM) to afford (3aR,6aR)-2-benzyl-3a-fluoro-5-methyl-octahydropyrrolo[3,4-c]pyrrole as a colorless oil (220 mg, 68%). LCMS (ES, m/z): 235 [M+H]+.
To a solution of (3aR,6aR)-2-benzyl-3a-fluoro-5-methyl-octahydropyrrolo[3,4-c]pyrrole (220 mg, 0.939 mmol) in MeOH (15 mL) was added Pd/C (21.9 mg, 5 wt % Pd). The resulting mixture was stirred for 3 h at 25° C. under hydrogen (2-3 atm). The reaction mixture was filtered and concentrated to afford (3aS,6aS)-3a-fluoro-2-methyl-octahydropyrrolo[3,4-c]pyrrole as light yellow oil (100 mg, 73%). LCMS (ES, m/z): 145 [M+H]+.
To a solution of tert-butyl 4-(3-[1-[(tert-butyldimethylsilyl)oxy]-2-[5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl]-2-oxoethyl]phenyl)piperazine-1-carboxylate (320 mg, 0.43 mmol) in dichloromethane (5 mL), was added Lawesson Reagent (88 mg, 0.22 mmol). The resulting mixture was stirred for 16 h at room temperature. The reaction mixture was concentrated under vacuum. The resulting crude product was purified by Prep-TLC eluting with 1:1 ethyl acetate/petroleum ether to give the product as a light yellow oil (130 mg, 36%). LCMS (ES, m/z) 757 [M+H]+.
To a solution of tert-butyl 3-hydroxyazetidine-1-carboxylate (5.00 g, 29 mmol) in DCM (200 mL) was added TEA (4.80 mL, 34.8 mmol) and methanesulfonyl chloride (2.50 mL, 31.9 mmol) at 0° C. The resulting solution was stirred for 1 h at 0° C. The reaction was then poured into brine (50 mL) and then extracted with dichloromethane (3×100 mL). The organic layers were combined, dried over anhydrous sodium sulfate, filtered and concentrated under vacuum to afford tert-butyl 3-(methanesulfonyloxy)azetidine-1-carboxylate as a yellow oil (11.1 g, crude). LCMS (ES, m/z): 252 [M+H]+.
To a solution of 3-bromophenol (10.7 g, 61.8 mmol) in DMF (250 mL) was added cesium carbonate (22.5 g, 69.0 mmol) and tert-butyl 3-(methanesulfonyloxy)azetidine-1-carboxylate (11.1 g, 44.2 mmol). The resulting mixture was stirred for 16 h at 80° C. After cooling to room temperature, the reaction mixture was poured into water (250 mL) and then extracted with ethyl acetate (3×50 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 1:5 ethyl acetate/petroleum ether) to afford tert-butyl 3-(3-bromophenoxy)azetidine-1-carboxylate as a yellow oil (5.58 g, 58%). LCMS (ES, m/z): 328, 330 [M+H]+.
To a solution of n-BuLi (5.6 mL, 2.5 M in THF) was added n-Bu2Mg (14 mL, 1 M in THF) at room temperature. The resulting mixture was stirred for 10 min at room temperature and treated with 6-bromo-2,3-dihydro(2,2,3,3-2H4)-1,4-benzodioxine (2.0 g, 9.04 mmol) in tetrahydrofuran (10 mL) added dropwise with stirring at −10° C. The resulting mixture was stirred for 1 h and then added to a solution of sulfuryl chloride (16 mL) in toluene (8 mL) with stirring at −10° C. The resulting mixture was stirred for 0.5 h and quenched with saturated aqueous ammonium chloride solution (30 mL). The product was extracted with ethyl acetate (3×30 mL). The organic layers were combined, dried over anhydrous sodium sulfate, filtered and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0 to 50% ethyl acetate/petroleum ether) to afford 2,3-dihydro(2,2,3,3-2H4)-1,4-benzodioxine-6-sulfonyl chloride as a yellow oil (1.3 g, 60%).
To a solution of 2,3-dihydro(2,2,3,3-H)-1,4-benzodioxine-6-sulfonyl chloride (1.3 g, 5.01 mmol) in DCM (20 mL) was added 1H-imidazole (742 mg, 10.9 mmol). The resulting solution was stirred for 2 h at room temperature. Then the reaction mixture was filtered and concentrated under vacuum to afford 1-[2,3-dihydro(2,2,3,3-2H4)-1,4-benzodioxine-6-sulfonyl]-1H-imidazole as a white solid (1.2 g, 89%). LCMS (ES, m/z): 271 [M+H]+.
To a solution of 1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrole dihydrobromide (3.6 g, 13.2 mmol) in water (15 mL) and ethanol (15 mL) was added 1-[2,3-dihydro(2,2,3,3-2H4)-1,4-benzodioxine-6-sulfonyl]-1H-imidazole (1.2 g, 4.08 mmol). The resulting solution was stirred for 18 h at room temperature and then 48 h at 60° C. After cooling to room temperature, the solution was basified to pH=14 with sodium hydroxide and then extracted with DCM (3×20 mL). The organic layers were combined, dried over anhydrous sodium sulfate, filtered and concentrated under vacuum to afford 2-[2,3-dihydro(2,2,3,3-2H4)-1,4-benzodioxine-6-sulfonyl]-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrole as a yellow solid (500 mg, 39%). LCMS (ES, m/z): 313 [M+H]+.
To a solution of triphenylphosphane (5.7 g, 21.7 mmol) in tetrahydrofuran (90 mL) was added DIAD (4.28 mL, 21.8 mmol) dropwise with stirring at 0° C. The resulting solution was stirred for 30 minutes at room temperature. This was followed by the addition of 5-bromo-2-chloropyridin-3-ol (3 g, 14.1 mmol) and (2H4)ethane-1,2-diol (957 mg, 14.2 mmol). The resulting solution was stirred overnight at room temperature. The reaction mixture was poured into water (250 mL) and then extracted with ethyl acetate (3×200 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 1:5 ethyl acetate/petroleum ether) to afford 2-[(5-bromo-2-chloropyridin-3-yl)oxy](2H4)ethan-1-ol as a light yellow oil (2 g, 55%). LCMS (ES, m/z): 256, 258 [M+H]+.
To a solution of 2-[(5-bromo-2-chloropyridin-3-yl)oxy](2H4)ethan-1-ol (2 g, 7.41 mmol) in ethylene glycol dimethyl ether (20 mL) was added sodium hydride (470 mg, 11.8 mmol, 60% dispersion in mineral oil) in portions at 0° C. The resulting mixture was stirred overnight at 80° C. in an oil bath. After cooling to room temperature, the reaction mixture was poured into water (50 mL) and then extracted with ethyl acetate (3×30 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 1:5 ethyl acetate/petroleum ether) to afford 7-bromo(2,2,3,3-2H4)-2H,3H-[1,4]dioxino[2,3-b]pyridine as a light yellow solid (600 mg, 37%). LCMS (ES, m/z): 220, 222 [M+H]+.
To a solution of n-BuLi (2 mL, 2.5 M in heptane) was added n-Bu2Mg (5 mL, 1.0 M in hexane) at 0° C. The resulting mixture was stirred for 30 min at room temperature. This was followed by addition of a solution of 7-bromo(2,2,3,3-2H4)-2H,3H-[1,4]dioxino[2,3-b]pyridine (700 mg, 2.86 mmol) in THF (6 mL) dropwise with stirring at −10° C. The resulting mixture was stirred for 2 h at this temperature. A solution of sulfuryl chloride (6 mL) in toluene (6 mL) was added dropwise with stirring at −10° C. After 0.5 h, the mixture was poured into saturated aqueous ammonium chloride solution (20 mL) and then extracted with ethyl acetate (3×15 mL). The combined organic layers were washed with brine (1×15 mL), dried over anhydrous sodium sulfate, filtered and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0-30% ethyl acetate/petroleum ether) to afford (2,2,3,3-2H4)-2H,3H-[1,4]dioxino[2,3-b]pyridine-7-sulfonyl chloride as a light yellow oil (200 mg, 29%). LCMS (ES, m/z): 240, 242 [M+H]+.
To a solution of (2,2,3,3-2H4)-2H,3H-[1,4]dioxino[2,3-b]pyridine-7-sulfonyl chloride (170 mg, 0.64 mmol) in dichloromethane (3 mL) was added tert-butyl 4,5-dihydropyrrolo[3,4-c]pyrrole-2(1H,3H,4H)-carboxylate (149 mg, 0.67 mmol) and DIEA (0.23 mL, 1.42 mmol). The resulting solution was stirred for 2 h at room temperature. The reaction mixture was poured into water (10 mL) and then extracted with ethyl acetate (3×10 mL). The organic layers were combined, dried over anhydrous sodium sulfate, filtered and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 1:3 ethyl acetate/petroleum ether) to afford tert-butyl 5-[(2,2,3,3-2H4)-2H,3H-[1,4]dioxino[2,3-b]pyridine-7-sulfonyl]-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrole-2-carboxylate as a yellow solid (200 mg, 76%). LCMS (ES, m/z): 414 [M+H]+.
A sample of (2,3-dihydrobenzo[b][1,4]dioxin-6-yl)magnesium bromide (0.5 M in THF) (2.201 ml, 1.100 mmol) in a 2-dram amber vial was cooled on an ice bath, then treated with N-sulfinyltritylamine (339.7 mg, 1.112 mmol). The sample was stirred 5 minutes, then in low light tert-butyl hypochlorite (127.4 mg, 1.173 mmol; caution: fire hazard) was added; the amber vial the hypochlorite was weighed in was rinsed with THF (0.10 mL), and the rinse was added to the rest. The sample was stirred 15 minutes, then (S)-2-oxo-1-phenyl-2-(3,4,5,6-tetrahydropyrrolo[3,4-c]pyrrol-2(1H)-yl)ethyl acetate hydrochloride (359.5 mg, 1.114 mmol) was added. The ice bath was allowed to melt and the sample was stirred at ambient temperature over the weekend. MsOH (0.40 ml, 6.16 mmol) was added and the mixture was triturated. The sample was partitioned between EtOAc and 0.3M aq sodium thiosulfate (20 mL each). The organic layer was dried (Na2SO4), filtered, treated with silica gel, and evaporated under reduced pressure. The material was chromatographed by Biotage MPLC (25 g silica gel column, 0 to 100% EtOAc in hexanes, then 1% MeOH in EtOAC) to provide a mixture (˜1:1) of (1S)-2-(5-(2,3-dihydrobenzo[b][1,4]dioxine-6-sulfonimidoyl)-3,4,5,6-tetrahydropyrrolo[3,4-c]pyrrol-2(1H)-yl)-2-oxo-1-phenylethyl acetate and (2S)-1-(5-(2,3-dihydrobenzo[b][1,4]dioxine-6-sulfonimidoyl)-3,4,5,6-tetrahydropyrrolo[3,4-c]pyrrol-2(1H)-yl)-2-hydroxy-2-phenylethan-1-one as a pale orange solid (215 mg). LCMS: Rt 2.15 min., m/z +442.33 [deacetylated product M+H]+; Rt 2.29 min, m/z +484.59 [product, M+H]+.
To a solution of 5-[2H,3H-[1,4]dioxino[2,3-b]pyridine-7-sulfonyl]-1H,2H,3H,5H-pyrrolo[3,4-c]pyrrole (180 mg, 0.43 mmol) in N,N-dimethylformamide (10 mL) was added 2-hydroxy-2-(2-methyl-1,3-benzoxazol-4-yl)acetic acid (89 mg, 0.43 mmol), DIEA (110.4 mg, 0.86 mmol), HOBt (63.5 mg, 0.47 mmol) and EDCI (90 mg, 0.47 mmol). The resulting mixture was stirred for 2 h at room temperature and poured into water (50 mL). The resulting solution was extracted with EtOAc (3×30 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered and concentrated under vacuum. The resulting crude product was purified by prep-TLC (eluting with 1:10 MeOH/DCM). The two enantiomers were separated by Chiral Prep-HPLC (Column: CHIRALPARK IC, 5 μm, 20×250 mm; Mobile Phase, A: DCM and B: MeOH (hold 85% B for 25 min); flow rate: 20 mL/min; Detector: UV 254/220 nm; RT: A (1st), 16.24 min; B (2nd), 21.61 min). The fractions of A were concentrated and lyophilized to afford 1-(5-[2H,3H-[1,4]dioxino[2,3-b]pyridine-7-sulfonyl]-1H,2H,3H,5H-pyrrolo[3,4-c]pyrrol-2-yl)-2-hydroxy-2-(2-methyl-1,3-benzoxazol-4-yl)ethan-1-one, 1st eluting isomer, as a white solid (39.8 mg, 19%). The fractions of B were concentrated and lyophilized to afford 1-(5-[2H,3H-[1,4]dioxino[2,3-b]pyridine-7-sulfonyl]-1H,2H,3H,5H-pyrrolo[3,4-c]pyrrol-2-yl)-2-hydroxy-2-(2-methyl-1,3-benzoxazol-4-yl)ethan-1-one, 2nd eluting isomer, as a white solid (31.7 mg, 15%).
To a solution of methyl 2-(3-cyclopropyl-4-methoxyphenyl)prop-2-enoate (300 mg, 1.29 mmol) in tetrahydrofuran (10 mL) was added methylamine (2 mL). The resulting mixture was stirred for 30 min at room temperature and concentrated under vacuum to remove excess methylamine. The residue was dissolved in tetrahydrofuran (5 mL) and treated with di-tert-butyl dicarbonate (423 mg, 1.94 mmol). The reaction stirred for 16 h and was concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 5:95 ethyl acetate/petroleum ether) to afford methyl 3-{[(tert-butoxy)carbonyl](methyl)amino}-2-(3-cyclopropyl-4-methoxyphenyl)propanoate as a light yellow oil (200 mg, 43%). LCMS (ES, m/z) 364 [M+H]+.
To a solution of methyl 3-{[(tert-butoxy)carbonyl](methyl)amino}-2-(3-cyclopropyl-4-methoxyphenyl)propanoate (200 mg, 0.55 mmol) in tetrahydrofuran (5 mL) was added water (5 mL), and lithium hydroxide (66 mg, 2.75 mmol). The resulting mixture was stirred for 16 h at room temperature. The reaction mixture was washed with diethyl ether (1×5 mL) and then acidified to pH=5 with saturated citric acid. The resulting solution was extracted with ethyl acetate (3×5 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum to afford 3-{[(tert-butoxy)carbonyl](methyl)amino}-2-(3-cyclopropyl-4-methoxyphenyl)propanoic acid as a light yellow oil (150 mg, 87%). LCMS (ES, m/z) 350 [M+H]+.
To a solution of 3-{[(tert-butoxy)carbonyl](methyl)amino}-2-(3-cyclopropyl-4-methoxyphenyl)propanoic acid (150 mg, 0.43 mmol) in DMF (5 mL) was added 2-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrole (177 mg, 0.51 mmol), DIEA (0.23 mL, 1.29 mmol) and HATU (196 mg, 0.51 mmol). The resulting solution was stirred for 1 h and poured into water (5 mL). The product was extracted with ethyl acetate (3×5 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by prep-TLC (eluting with 1:1 ethyl acetate/petroleum ether) to afford tert-butyl N-[2-(3-cyclopropyl-4-methoxyphenyl)-3-[5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl]-3-oxopropyl]-N-methylcarbamate as a light yellow oil (150 mg, 55%). LCMS (ES, m/z) 640 [M+H]+.
To a solution of tert-butyl N-[2-(3-cyclopropyl-4-methoxyphenyl)-3-[5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl]-3-oxopropyl]-N-methylcarbamate (150 mg, 0.16 mmol) in dichloromethane (4 mL) was added trifluoroacetic acid (1 mL). The resulting solution was stirred for 2 h at room temperature and concentrated under vacuum. The reaction was quenched with saturated potassium carbonate solution (5 mL) and then extracted with dichloromethane (3×5 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The crude product was purified by Prep-HPLC (Column: XBridge Shield RP18 OBD Column, 5 μm, 19×150 mm; Mobile Phase, A: water (containing 10 mmol/L NH4HCO3) and B: CH3CN (30% to 58% over 7 min); Flow rate: 20 mL/min; Detector: UV 254 nm). The product fractions were concentrated under vacuum. The two enantiomers were further separated by (Column: CHIRALPAK IC, 5 μm, 20×250 mm; Mobile Phase, A: MTBE (containing 0.1% DEA) and B: EtOH (keep 50% B over 18 min); Detector: UV 254/220 nm; Retention time: A (1st), 9.54 min; B (2nd), 12.96 min). The product fractions were concentrated and lyophilized to afford 2-(3-cyclopropyl-4-methoxyphenyl)-1-[5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl]-3-(methylamino)propan-1-one), 1st eluting isomer, as a white solid (44.3 mg, 70%), and 2-(3-cyclopropyl-4-methoxyphenyl)-1-[5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl]-3-(methylamino)propan-1-one), 2nd eluting isomer, as a white solid (30.2 mg 48%).
To a solution of 3-[[(tert-butoxy)carbonyl]amino]-2-(3-chlorophenyl)-2-fluoropropanoic acid (120 mg, 0.34 mmol) in DMF (2 mL) was added HATU (155 mg, 0.41 mmol), 2-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrole (110 mg, 0.34 mmol) and DIEA (132 mg, 1.02 mmol). The resulting solution was stirred for 1 h at room temperature. The reaction mixture was poured into water (10 mL) and then extracted with ethyl acetate (3×20 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by prep-TLC (eluting with 2:1 ethyl acetate/petroleum ether) to afford tert-butyl N-[2-(3-chlorophenyl)-3-[5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl]-2-fluoro-3-oxopropyl]carbamate as a yellow oil (120 mg, 58%). LCMS (ES, m/z) 608, 610 [M+H]+.
To a solution of tert-butyl N-[2-(3-chlorophenyl)-3-[5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl]-2-fluoro-3-oxopropyl]carbamate (120 mg, 0.20 mmol) in THF (2 mL) was added sodium hydride (10 mg, 0.25 mmol, 60% dispersion in mineral oil) at 0° C. The resulting solution was stirred for 30 min at 0° C. and then treated with iodomethane (28 mg, 0.20 mmol). The resulting mixture was stirred for 6 h at room temperature. The reaction mixture was poured into aqueous ammonium chloride solution (10 mL) and then extracted with ethyl acetate (3×20 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum to afford tert-butyl N-[2-(3-chlorophenyl)-3-[5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c] pyrrol-2-yl]-2-fluoro-3-oxopropyl]-N-methylcarbamate as a yellow oil (120 mg, 98%). LCMS (ES, m/z) 622, 624 [M+H]+.
To a solution of tert-butyl N-[2-(3-chlorophenyl)-3-[5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c] pyrrol-2-yl]-2-fluoro-3-oxopropyl]-N-methylcarbamate (120 mg, 0.18 mmol) in dichloromethane (2 mL) was added TFA (0.4 mL). The resulting solution was stirred for 1 h at room temperature and concentrated under vacuum. The resulting crude product was purified by Prep-HPLC (Column: XBridge Shield RP18 OBD Column, 5 μm, 19×150 mm; Mobile Phase, A: water (containing 10 mmol/L NH4HCO3) and B: CH3CN (28% to 50% over 15 min); Flow rate: 20 mL/min; Detector: UV 254 nm). The two enantiomers were further separated by (Column: CHIRALPAK IF, 5 μm, 20×250 mm; Mobile Phase, A: methanol (containing 0.1% DEA) and B: DCM (hold 50% B over 15 min); Detector: UV 254/220 nm; Retention time: A (1st), 8.817 min; B (2nd), 11.059 min). The product fractions of A were concentrated and lyophilized to afford 2-(3-chlorophenyl)-1-[5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl]-2-fluoro-3-(methylamino)propan-1-one, 1st eluting isomer, as a white solid (24.4 mg, 26%). The product fractions of B were concentrated and lyophilized to afford 2-(3-chloro-4-cyclopropoxyphenyl)-1-[5-(2,3-Dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl]-3-(methylamino)propan-1-one, 2nd eluting isomer, as a white solid (11.9 mg, 12%).
To a solution of tert-butyl 4-[2-[5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c] pyrrol-2-yl]-1-hydroxy-2-oxoethyl]-2,3-dihydro-1H-isoindole-2-carboxylate (780 mg, 1.34 mmol) in dichloromethane (6 mL) was added hydrochloric acid (6 mL, 4 N in 1,4-dioxane). The resulting solution was stirred for 2 h at room temperature and concentrated under vacuum to afford 1-[5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl]-2-(2,3-dihydro-1H-isoindol-4-yl)-2-hydroxyethan-1-one HCl salt as a dark red solid (680 mg, 62%). LCMS (ES, m/z) 484 [M+H]+.
To a solution of 1-[5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl]-2-(2,3-dihydro-1H-isoindol-4-yl)-2-hydroxyethan-1-one (680 mg, 1.40 mmol) in methanol (7 mL) was added formaldehyde (7 mL, 40 wt % in water). The resulting solution was stirred for 2 h at room temperature and then treated with sodium triacetoxyborohydride (893 mg, 4.21 mmol). The resulting mixture was stirred for 16 h at room temperature and concentrated under vacuum. The crude product was purified by prep-TLC (eluting with 1:10 MeOH/DCM). The enantiomers were separated by prep-Chiral HPLC (Column: CHIRAL ART Cellulose-SB, 5 μm, 20×250 mm; Mobile Phase, A: DCM and B: EtOH (0.1% DEA) (keep 40% B over 10 min); Detector: UV 254/220 nm; Retention time: 1st, 6.63 min; 2nd, 8.63 min. The product fractions were concentrated and lyophilized to afford 1-[5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl]-2-hydroxy-2-(2-methyl-2,3-dihydro-1H-isoindol-4-yl)ethan-1-one, 1st eluting isomer, as a white solid (41.2 mg, 6%), and 1-[5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl]-2-hydroxy-2-methyl-2,3-dihydro-1H-isoindol-4-yl)ethan-1-one, 2nd eluting isomer, as a white solid (42.4 mg, 5%).
To a solution of 2-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo [3,4-c]pyrrole (529 mg, 1.63 mmol) in DMF (3 mL) was added 2-[2-[(tert-butoxy)carbonyl]-2,3-dihydro-1H-isoindol-4-yl]-2-oxoacetic acid (500 mg, 1.46 mmol), DIEA (665 mg, 4.89 mmol) and HATU (783 mg, 1.96 mmol). The resulting solution was stirred for 1 h at room temperature. The reaction mixture was poured into water (5 mL) and then extracted with EtOAc (3×5 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by prep-TLC (eluting with 3:1 ethyl acetate/petroleum ether) to afford tert-butyl 4-[2-[5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl]-2-oxoacetyl]-2,3-dihydro-1H-isoindole-2-carboxylate as a yellow oil (300 mg, 30%). LCMS (ES, m/z) 582 [M+H]+.
To a solution of tert-butyl 4-[2-[5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo [3,4-c]pyrrol-2-yl]-2-oxoacetyl]-2,3-dihydro-1H-isoindole-2-carboxylate (300 mg, 0.45 mmol) in DCM (6 mL) was added TFA (1.5 mL). The resulting mixture was stirred for 2 h at room temperature and concentrated under vacuum. The resulting mixture was basified to pH=8 with saturated potassium carbonate solution and then extracted with dichloromethane (2×5 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered and concentrated under vacuum to afford 1-[5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl]-2-(2,3-dihydro-1H-isoindol-4-yl)ethane-1,2-dione as a yellow solid (200 mg, crude). LCMS (ES, m/z) 482 [M+H]+.
To a solution of 1-[5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl]-2-(2,3-dihydro-1H-isoindol-4-yl)ethane-1,2-dione (217 mg, 0.38 mmol) in 1,2-dichloroethane (15 ml) was added copper (II) acetate (90 mg, 0.43 mmol), 2,2′-bipyridine (70 mg, 0.43 mmol), cyclopropylboronic acid (77 mg, 0.85 mmol) and sodium carbonate (95 mg, 0.86 mmol). The resulting mixture was stirred for 16 h at 70° C. under air atmosphere and cooled to room temperature. The reaction mixture was filtered and poured into water (10 mL). The resulting solution was extracted with ethyl acetate (3×10 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered and concentrated under vacuum. The resulting crude product was purified by prep-TLC (eluting with 3:1 ethyl acetate/petroleum ether) to afford 1-(2-cyclopropyl-2,3-dihydro-1H-isoindol-4-yl)-2-[5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl]ethane-1,2-dione as a white solid (60 mg, 26%). LCMS (ES, m/z) 522 [M+H]+.
To a solution of 1-(2-cyclopropyl-2,3-dihydro-1H-isoindol-4-yl)-2-[5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl]ethane-1,2-dione (60 mg, 0.10 mmol) in methanol (1.5 mL) was added sodium borohydride (9 mg, 0.23 mmol). The resulting solution was stirred for 2 h at room temperature. The reaction mixture was poured into water (5 mL) and then extracted with EtOAc (3×5 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 10:1 DCM/MeOH) and further purified by Prep-HPLC (Column: XBridge Prep C18 OBD Column (19×150 mm) 5 um; Mobile Phase A: Water (10 mmoL/L NH4HCO3), Mobile Phase B: MeCN (30% B to 55% B over 7 min); Flow rate: 20 mL/min; Detector: 254/220 nm). The two enantiomers were further separated by Chiral-Prep-HPLC (Column: CHIRALPAK IE, 2×25 cm, 5 μm; Mobile Phase A: MeOH (containing 0.1% DEA), Mobile Phase B: DCM (Hold 35% B over 14 min); Flow rate: 19 mL/min; Detector: 220/254 nm; A: 9.39 min; B: 12.4 min). The fractions of A were concentrated and lyophilized to afford 2-(2-cyclopropyl-2,3-dihydro-1H-isoindol-4-yl)-1-[5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl]-2-hydroxyethan-1-one, 1st eluting isomer, as a white solid (5.0 mg, 10%). The fractions of B were concentrated and lyophilized to afford 2-(2-cyclopropyl-2,3-dihydro-1H-isoindol-4-yl)-1-[5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl]-2-hydroxyethan-1-one, 2nd eluting isomer, as a white solid (5.3 mg, 10%).
To a solution of (2R)-3-{[(tert-butoxy)carbonyl](methyl)amino}-2-(3-chlorophenyl)propanoic acid (2.30 g, 7.34 mmol) in N,N-dimethylformamide (20 mL) was added HATU (3.07 g, 8.08 mmol), 2-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrole hydrochloride (2.52 g, 7.34 mmol), and DIEA (3.82 mL, 22.1 mmol). The resulting solution was stirred for 2 h at rt. The reaction mixture was poured into water (100 mL) and then extracted with ethyl acetate (3×100 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The crude product was purified by silica gel chromatography (eluting with 1:15 ethyl acetate/dichloromethane) to afford tert-butyl N-[(2S)-2-(3-chlorophenyl)-3-[5-(2,3-Dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl]-3-oxopropyl]-N-methylcarbamate as a white solid (3.5 g, 79%). 1H-NMR (DMSO-d6, 400 MHz) δ (ppm): 7.40-7.18 (m, 6H), 7.07-7.06 (m, 1H), 4.45-4.22 (m, 5H), 4.11-3.88 (m, 7H), 3.88-3.58 (m, 2H), 3.44-3.36 (m, 1H), 2.75-2.67 (m, 3H), 1.27-1.16 (m, 9H). LCMS (ES, m/z) 604, 606 [M+H]+.
To a solution of tert-butyl N-[(2S)-2-(3-chlorophenyl)-3-[5-(2,3-Dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl]-3-oxopropyl]-N-methylcarbamate (1.5 g, 2.49 mmol) in ethyl acetate (10 mL) was added a solution of hydrochloric acid (10 mL, 4 N in 1,4-dioxane). The resulting solution was stirred for 3 h at 25° C. The mixture was concentrated under vacuum to about ⅓ volume and the solids were collected by filtration. The solids were treated with EtOAc (10 mL) at 70° C., filtered at room temperature, and dissolved with saturated potassium carbonate solution/EA (1:1, 10 mL). The resulting solution was stirred for 3 h and then extracted with EA (3×5 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum to afford (2S)-2-(3-chlorophenyl)-1-[5-(2,3-dihydro-1,4-Benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl]-3-(methylamino)propan-1-one as a white solid (1 g, 80%). 1H-NMR (DMSO-d6, 400 MHz) δ (ppm): 7.36-7.25 (m, 6H), 7.07-7.06 (m, 1H), 4.40-4.29 (m, 5H), 4.06-3.88 (m, 8H), 3.06-3.01 (m, 1H), 2.60-2.50 (m, 1H), 2.23 (s, 3H), 1.66 (s, 1H). LCMS (ES, m/z) 504, 506 [M+H]+.
To a solution of methyl 2-(3-chlorophenyl)acetate (200 g, 1.09 mol) in N,N-dimethylformamide (1.5 L) was added paraformaldehyde (117 g, 1.30 mol), tetrabutylammonium iodide (40 g, 0.11 mol), and potassium carbonate (373 g, 2.70 mol) successively. The resulting solution was stirred for 10 min at 60° C. and then cooled to rt. The reaction mixture was poured into water (300 mL) and extracted with ethyl acetate (3×500 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 10:90 ethyl acetate/petroleum ether) to afford methyl 2-(3-chlorophenyl)prop-2-enoate as colorless oil (60 g, 28%). 1H-NMR (CDCl3, 400 MHz) δ (ppm): 7.43 (s, 1H), 7.35-7.27 (m, 3H), 6.43 (s, 1H), 5.94 (s, 1H), 3.94 (s, 3H). LCMS (ES, m/z) 197, 199 [M+H]+.
To a solution of methyl 2-(3-chlorophenyl) prop-2-enoate (60 g, 0.31 mol) in THF (100 mL) was added a solution of methylamine (100 mL, 2 M in THF). The resulting mixture was stirred for 2 h at rt. The resulting solution was concentrated under vacuum, and then dissolved in THF (200 mL). To the above solution was added TEA (84.9 mL, 0.61 mol), and Di-tert-butyl dicarbonate (80.1 g, 0.37 mol). The resulting mixture was stirred for 16 h at rt and then concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 5:95 ethyl acetate/petroleum ether) to afford methyl 3-{[(tert-butoxy)carbonyl](methyl)amino}-2-(3-chlorophenyl)propanoate as yellow oil (65 g, 65%). 1H-NMR (CDCl3, 400 MHz) δ (ppm): 7.34-7.10 (m, 4H), 3.95-3.87 (m, 1H), 3.78-3.52 (m, 5H), 2.96-2.64 (m, 3H), 1.44 (s, 9H). LCMS (ES, m/z) 328, 330 [M+H]+.
To a solution of methyl 3-{[(tert-butoxy)carbonyl](methyl)amino}-2-(3-chlorophenyl)propanoate (60 g, 0.18 mol) in THF (300 mL) was added water (300 mL), and lithium hydroxide (22 g, 0.91 mol). The resulting mixture was stirred for 16 h at room temperature. The resulting mixture was washed with diethyl ether (1×500 mL), and then acidified to pH=5 with saturated citric acid solution. The resulting solution was extracted with ethyl acetate (3×500 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum to afford 3-{[(tert-butoxy)carbonyl](methyl)amino}-2-(3-chlorophenyl)propanoic acid as yellow oil (23 g, 74%). 1H-NMR (CD3OD, 400 MHz) δ (ppm): 7.46-7.19 (m, 4H), 4.05-3.87 (m, 1H), 3.85-3.57 (m, 2H), 2.88-2.69 (m, 3H), 1.44 (s, 9H). LCMS (ES, m/z) 314, 316 [M+H]+.
To a solution of 2,3-dimethylbut-2-ene (1000 g, 11.9 mol) in dichloromethane (500 mL) was slow added a solution of hydrobromic acid (150 mL, 48 wt % in water). This was followed by the addition of bromine (9.90 kg, 61.9 mol) dropwise with stirring at 0-15° C. for about 8 h. The resulting mixture was stirred for 72 h at 45° C. The reaction was then quenched by the careful addition of a saturated aqueous solution of sodium hydrogen sulfite (10 L). The solids formed were collected by filtration, and dried under infrared lamp to afford 1,4-dibromo-2,3-bis(bromomethyl)but-2-ene as a light yellow solid (3.34 kg, 49%). 1H-NMR (CDCl3, 400 MHz) δ (ppm): 4.35 (s, 8H). GCMS (EI, m/z): 398, 400, 402 [M]+.
To a solution of 1,4-dibromo-2,3-bis(bromomethyl)but-2-ene (2.00 kg, 3.50 mol) in N,N-dimethylformamide (20 L) was added 4-methylbenzene-1-sulfonamide (2.14 kg, 12.5 mol) and potassium carbonate (5.18 kg, 37.4 mol) successively. The resulting solution was stirred for 48 h at room temperature. The reaction was then quenched by the addition of water/ice (20 L). The solids were then collected by filtration, treated with ethanol (1 L), filtered and dried under vacuum to afford 2,5-bis(4-methylbenzenesulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrole as alight yellow solid (1.34 kg, 78%). 1H-NMR (DMSO-d6, 400 MHz) δ (ppm): 7.79-7.62 (m, 4H), 7.49-7.35 (m, 4H), 3.92 (s, 8H), 2.43-2.35 (m, 6H). LCMS (ES, m/z) 419 [M+H]+.
To 2,5-bis(4-methylbenzenesulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrole (1.34 kg, 2.73 mol) was carefully added a solution of hydrobromic acid (4.5 L, 48 wt % in water), and phenol (1.27 kg). The resulting mixture was stirred for 72 h at 120° C. and then cooled to room temperature. The resulting mixture was concentrated under vacuum. The resulting solids were treat with DCM/MeOH (10:1, 1 L), filtered and dried under vacuum to afford 1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrole dihydrobromide as a yellow solid (480 g, 55%). 1H-NMR (D2O, 400 MHz) δ (ppm): 4.17 (s, 8H). LCMS (ES, m/z) 111 [M+H]+.
To a solution of 1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrole dihydrobromide (458 g, 1.68 mol) in water (4 L) was added sodium bicarbonate (424 g, 5.05 mol). This was followed by the dropwise addition of a solution of di-tert-butyl dicarbonate (807 g, 3.70 mol) in methanol (500 mL) with stirring at 0° C. The resulting mixture was stirred for 16 h at room temperature. The solids were collected by filtration and dried under vacuum to afford 2,5-di-tert-butyl 1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrole-2,5-dicarboxylate as a white solid (300 g, 61%). 1H-NMR (CDCl3, 400 MHz) δ (ppm): 4.11 (s, 8H), 1.47 (s, 18H). LCMS (ES, m/z) 296 [M+H-Me]+.
To a solution of 2,5-di-tert-butyl 1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrole-2,5-dicarboxylate (200 g, 0.65 mol) in propan-2-yl acetate (5 L) was added 4-methylbenzene-1-sulfonic acid (123 g, 0.65 mol). The resulting mixture was stirred for 16 h at 55° C. and then cooled to room temperature. The solids were collected by filtration and dried under vacuum to afford tert-butyl 1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrole-2-carboxylate PTSA salt as a yellow solid (197 g, 80%). 1H-NMR (CD3OD, 400 MHz) δ (ppm): 7.73-7.71 (d, J=8.0 Hz, 2H), 7.27-7.25 (d, J=8.0 Hz, 2H), 4.09 (s, 8H), 2.39 (s, 3H), 1.51 (s, 9H). LCMS (ES, m/z) 211 [M+H]+.
To a mixture of tert-butyl 1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrole-2-carboxylate PTSA salt (61 g, 0.16 mol) in THF (90 mL) was added a solution of sodium hydroxide (13 g, 0.32 mol) in water (300 mL), and then 2,3-dihydro-1,4-benzodioxine-6-sulfonyl chloride (25 g, 0.11 mol). The resulting mixture was stirred for 3 h at room temperature. The reaction mixture was treated with water (200 mL) and extracted with ethyl acetate (3×400 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 10:90 ethyl acetate/dichloromethane) to afford tert-butyl 5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrole-2-carboxylate (30 g, 46%). 1H-NMR (CDCl3, 400 MHz) δ (ppm): 7.37-7.28 (m, 2H), 6.99-6.97 (m, 1H), 4.34-4.29 (m, 4H), 4.09-4.01 (m, 8H), 1.45 (s, 9H). LCMS (ES, m/z) 409 [M+H]+.
To a solution of tert-butyl 5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrole-2-carboxylate (30 g, 0.69 mol) in dichloromethane (100 mL) was added a solution of hydrochloric acid (200 mL, 4 N in 1,4-dioxane). The resulting solution was stirred for 2 h at room temperature and then concentrated under vacuum to afford 2-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrole hydrochloride as a yellow solid (20 g, 79%). 1H-NMR (DMSO-d6, 400 MHz) δ (ppm): 10.29 (s, 2H), 7.32-7.22 (m, 2H), 7.11-7.05 (m, 1H), 4.36-4.32 (m, 4H), 4.04 (s, 4H), 3.94-3.87 (m, 4H). LCMS (ES, m/z) 309 [M+H]+.
To a solution of 3-{[(tert-butoxy)carbonyl](methyl)amino}-2-(3-chlorophenyl)propanoic acid (50.9 g, 0.16 mol) in N,N-dimethylformamide (1 L) was added HATU (57.4 g, 0.15 mol), 2-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrole hydrochloride (40 g, 0.11 mol), and DIEA (40 mL, 0.23 mol). The resulting solution was stirred for 1 h at rt. The reaction mixture was poured into water (1 L) and then extracted with ethyl acetate (3×1.5 L). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The crude product was purified by silica gel chromatography (eluting with 10:90 ethyl acetate/dichloromethane). The two enantiomers were further separated by SFC with the following conditions: Column: Enantiocel-C1, 5 μm, 19×150 mm; Mobile Phase, A: CO2 and B: MeOH (containing 2 mM NH3) (hold 50% B for 10 min); flow rate: 180 mL/min; Detector: UV 254 nm; Rt: A, 6.02 min; B, 7.66 min). Then the fractions of B were concentrated and lyophilized to afford tert-butyl N-[(2S)-2-(3-chlorophenyl)-3-[5-(2,3-Dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl]-3-oxopropyl]-N-methylcarbamate as a white solid (14 g, 21%). 1H-NMR (DMSO-d6, 400 MHz) δ (ppm): 7.40-7.18 (m, 6H), 7.07-7.06 (m, 1H), 4.45-4.22 (m, 5H), 4.11-3.88 (m, 7H), 3.88-3.58 (m, 2H), 3.44-3.36 (m, 1H), 2.75-2.67 (m, 3H), 1.27-1.16 (m, 9H). LCMS (ES, m/z) 604, 606 [M+H]+.
To a solution of tert-butyl N-[(2S)-2-(3-chlorophenyl)-3-[5-(2,3-Dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl]-3-oxopropyl]-N-methylcarbamate (3.0 g, 4.92 mmol) in DCM (80 mL) was added a solution of hydrochloric acid (10 mL, 4 N in 1,4-dioxane). The resulting solution was stirred for 4 h at 25° C. The resulting mixture was concentrated under vacuum to about ⅓ volume. The solids formed were collected by filtration, washed with EA (100 mL), and then dissolved with saturated potassium carbonate solution/EA (1:1, 200 mL). The resulting solution was stirred for 3 h and then extracted with EA (3×50 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum to afford (2S)-2-(3-chlorophenyl)-1-[5-(2,3-dihydro-1,4-Benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl]-3-(methylamino)propan-1-one as a white solid (1.9 g, 75.9%). 1H-NMR (DMSO-d6, 400 MHz) δ (ppm): 7.36-7.25 (m, 6H), 7.07-7.05 (m, 1H), 4.42-4.37 (m, 1H), 4.35-4.29 (m, 4H), 4.06-3.88 (m, 8H), 3.06-3.01 (m, 1H), 2.60-2.55 (m, 1H), 2.23 (s, 3H), 1.66 (s, 1H). LCMS (ES, m/z) 504, 506 [M+H]+.
To a solution of 2-[2-[(tert-butoxy)carbonyl]-1,2,3,4-tetrahydroisoquinolin-5-yl]-2-oxoacetic acid (200 mg, 0.66 mmol) in DMF (3 mL) was added 2-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrole (242 mg, 0.78 mmol), DIEA (0.33 mL, 1.96 mmol), and HATU (298 mg, 0.78 mmol). The resulting solution was stirred for 1 h at room temperature. The reaction mixture was poured into water (20 mL) and then extracted with EtOAc (4×50 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by prep-TLC (eluting with 2:1 ethyl acetate/petroleum ether) to afford tert-butyl 5-[2-[5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl]-2-oxoacetyl]-1,2,3,4-tetrahydroisoquinoline-2-carboxylate as a white solid (180 mg, 39%). LCMS (ES, m/z): 596 [M+H]+.
To a solution of tert-butyl 5-[2-[5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl]-2-oxoacetyl]-1,2,3,4-tetrahydroisoquinoline-2-carboxylate (180 mg, 0.30 mmol) in methanol (3 mL) was added sodium borohydride (23 mg, 0.61 mmol). The resulting solution was stirred for 1 h at rt. The mixture was concentrated under vacuum and treated with water (20 mL) and then extracted with EtOAc (3×50 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by Prep-TLC (eluting with 5:1 ethyl acetate/petroleum ether) to afford tert-butyl 5-[2-[5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl]-1-hydroxy-2-oxoethyl]-1,2,3,4-tetrahydroisoquinoline-2-carboxylate as a white solid (120 mg, 66%). LCMS (ES, m/z): 598 [M+H]+.
To a solution of tert-butyl 5-[2-[5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl]-1-hydroxy-2-oxoethyl]-1,2,3,4-tetrahydroisoquinoline-2-carboxylate (120 mg, 0.20 mmol) in dichloromethane (1 mL) was added trifluoroacetic acid (4 mL). The resulting solution was stirred for 2 h at room temperature and concentrated under vacuum. The resulting mixture was basified to pH=8 with saturated potassium carbonate solution and then extracted with dichloromethane (2×5 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum to afford 1-[5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl]-2-hydroxy-2-(1,2,3,4-tetrahydroisoquinolin-5-yl)ethan-1-one as a white solid (100 mg, 60%). LCMS (ES, m/z): 498 [M+H]+.
To a solution of 1-[5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl]-2-hydroxy-2-(1,2,3,4-tetrahydroisoquinolin-5-yl)ethan-1-one (100 mg, 0.20 mmol) in dichloromethane (3 mL) was added paraformaldehyde (30 mg, 1.00 mmol) and trifluoroacetic acid (20 mg). The resulting solution was stirred for 1 h at rt. To the reaction was added sodium triacetoxyborohyride (212 mg, 1.00 mmol) was added stirred for 16 h. The resulting mixture was concentrated under vacuum, treated with water (20 mL) and then extracted with EtOAc (3×50 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The crude product was purified by Prep-HPLC (Column: XBridge Prep C18 OBD Column 19×150 mm, 5 μm; Mobile Phase A: water (10 mmoL/L NH4HCO3), Mobile Phase B: MeCN (28% B to 48% B over 7 min); Flow rate: 20 mL/min; Detector: 254/220 nm). The product fractions were concentrated under vacuum. The two enantiomers were further separated by Prep-Chiral HPLC (Column: CHIRAL ART Cellulose-SB, 2×25 cm, 5 μm; Mobile Phase A: MTBE (0.1% DEA), Mobile Phase B: MeOH (keep 50% B over 23 min); Flow rate: 20 mL/min; Detector: 220/254 nm; 1st: 12.0 min; 2nd: 18.9 min). The product fractions were concentrated and lyophilized to afford 1-[5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl]-2-hydroxy-2-(2-methyl-1,2,3,4-tetrahydroisoquinolin-5-yl)ethan-1-one, 1st eluting isomer, as a white solid (3.8 mg, 1%), and 1-[5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl]-2-hydroxy-2-(2-methyl-1,2,3,4-tetrahydroisoquinolin-5-yl)ethan-1-one, 2nd eluting isomer, as a white solid (3 mg, 1%).
To a solution of dimethylamine (10 mL, 2 M in THF) was added methyl 2-(4-fluoro-2-methoxyphenyl)prop-2-enoate (500 mg, 2.02 mmol). The resulting mixture was stirred for 4 h at rt and then concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 1:1 ethyl acetate/petroleum ether) to afford methyl 2-(dimethylamino)-2-(4-fluoro-2-methoxyphenyl) acetate as a yellow oil (500 mg, 87%). LCMS (ES, m/z): 256 [M+H]+.
To a solution of methyl 3-(dimethylamino)-2-(5-fluoro-2-methoxyphenyl)propanoate (500 mg, 1.67 mmol) in THF (5 mL) was added lithium hydroxide (210 mg, 8.32 mmol) and water (5 mL). The mixture was stirred for 2 h at rt. The resulting solution was washed with diethyl ether (1×10 mL) and acidified to pH=5 with hydrochloric acid (0.5 N). The resulting solution was extracted with ethyl acetate (3×10 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum to afford 3-(dimethylamino)-2-(5-fluoro-2-methoxyphenyl)propanoic acid as a white solid (400 mg, 85%). LCMS (ES, m/z): 242 [M+H]+.
To a solution of 3-(dimethylamino)-2-(5-fluoro-2-methoxyphenyl)propanoic acid (150 mg, 0.56 mmol) in DMF (3 mL) was added HATU (269 mg, 0.67 mmol), 2-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrole (218 mg, 0.67 mmol), and DIEA (2.92 mL, 1.68 mmol). The resulting mixture was stirred for 2 h at rt. The reaction was poured into water (5 mL) and then extracted with ethyl acetate (3×5 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 3:1 ethyl acetate/petroleum ether) and further purified by Prep-HPLC (Column: XBridge Shield RP18 OBD Column, 5 μm, 19×150 mm; Mobile Phase, A: water (containing 10 mmol/L NH4HCO3) and B: MeCN (30% to 55% over 7 min); Flow rate: 20 mL/min; Detector: UV 254 nm). The product fractions were concentrated under vacuum. The two enantiomers were further separated by Chiral Prep-HPLC (Column: CHIRAL ART Cellulose-SB, 5 μm, 20×250 mm; Mobile Phase, A: hexane/DCM (3:1) and B: EtOH (keep 50% B over 10 min); Flow rate: 20 mL/min; Detector: UV 254/220 nm; Retention time: 1st, 6.201 min; 2nd, 8.07 min). The product fractions were concentrated and lyophilized to afford 1-[5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl]-3-(dimethylamino)-2-(5-fluoro-2-methoxyphenyl)propan-1-one, 1st eluting isomer, as a white solid (12.1 mg, 3.9%), and 1-[5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl]-3-(dimethylamino)-2-(5-fluoro-2-methoxyphenyl)propan-1-one, 2nd eluting isomer, as a white solid (15.3 mg, 4.9%).
To a solution of (2S)-2-amino-1-[5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl]-2-phenylethan-1-one (65 mg, 0.15 mmol) in dichloromethane (5 mL) was added triethylamine (45 mg, 0.44 mmol) and N-methylcarbamoyl chloride (18 mg, 0.19 mmol) at 0° C. The resulting solution was stirred for 3 h at room temperature. The resulting mixture was concentrated under vacuum. The resulting crude product was purified by Prep-HPLC (Column: SunFire Prep C18 column, 5 μm, 19×150 mm; Mobile Phase, A: water (containing 0.1% formic acid) and B: MeCN (15% to 70% over 12 min); Flow rate: 20 mL/min; Detector: UV 254 nm). The product fractions were concentrated under vacuum to afford 1-[(1S)-2-[5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl]-2-oxo-1-phenylethyl]-3-methylurea as a white solid (11.1 mg, 15%). 1H-NMR (CD3OD, 300 MHz) δ (ppm): 7.41-7.31 (m, 7H), 7.01 (d, J=9.3 Hz, 1H), 5.46 (s, 1H), 4.49-4.44 (m, 1H), 4.33-4.30 (m, 4H), 4.25-4.19 (m, 1H), 4.10-4.04 (m, 5H), 3.92-3.88 (m, 1H), 2.69 (s, 3H). LCMS (ESI, m/z): 499 [M+H]+.
To a solution of 3-[(oxetan-3-yl)amino]-2-phenylpropanoic acid (60 mg, 0.27 mmol) in DMF (10 mL) was added HATU (123 mg, 0.32 mmol), 2-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrole hydrochloride (93 mg, 0.27 mmol) and DIEA (0.13 mL, 0.81 mmol). The resulting mixture was stirred for 1 h at room temperature. The reaction mixture was poured into water (5 mL) and then extracted with ethyl acetate (3×10 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by Prep-HPLC (Column: XBridge Shield RP18 OBD Column, 5 μm, 30×150 mm; Mobile Phase, A: water (containing 10 mmol/L NH4HCO3) and B: CH3CN (25% to 45% over 7 min); Flow rate: 60 mL/min; Detector: UV 254 nm). The product fractions were concentrated under vacuum. The two enantiomers were further separated by Chiral Prep-HPLC (Column: CHIRALPAK IF, 5 μm, 20×250 mm; Mobile Phase, A: MeOH (containing 0.1% DEA) and B: DCM (keep 10% B over 16 min); Flow rate: 20 mL/min; Detector: UV 254/220 nm; Retention time: 1st, 17.285 min; 2nd, 21.532 min). The product fractions were concentrated and lyophilized to afford 1-[5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl]-3-[(oxetan-3-yl)amino]-2-phenylpropan-1-one, 1st eluting isomer, as a white solid (1 mg, 1.4%), and 1-[5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl]-3-[(oxetan-3-yl)amino]-2-phenylpropan-1-one, 2nd eluting isomer, as a white solid (1 mg, 1.4%).
To a solution of 2-[(1-[2-[(tert-butyldimethylsilyl)oxy]ethyl]azetidin-3-yl)oxy]-1-[5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl]-2-phenylethan-1-one (150 mg, 0.20 mmol) in acetonitrile (1.9 mL) was added hydrofluoric acid (0.1 mL). The resulting mixture was stirred for 18 h at 25° C. The reaction mixture was concentrated and dissolved in methanol (2 mL). The resulting solution was basified to pH=8 with ammonia (7 M in MeOH) and then concentrated under vacuum. The crude product was purified by Prep-HPLC (Column: XBridge Prep C18 OBD Column, 5 μm, 19×150 mm; Mobile Phase, A: water (containing 10 mmol/L NH4HCO3) and B: MeCN (10% to 50% over 8 min); Flow rate: 20 mL/min; Detector: UV 254 nm). The product fractions were concentrated under vacuum. The two enantiomers were separated by Chiral Prep-HPLC (Column: CHIRAL ART Cellulose-SB, 5 μm, 20×250 mm; Mobile Phase, A: MeOH (containing 0.1% IPA) and B: DCM (keep 100% A over 13 min); Flow rate: 14 mL/min; Detector: UV 254/220 nm; Retention time: 1st, 7.566 min; 2nd, 8.977 min). The product fractions were concentrated and lyophilized to 1-[5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl]-2-[[1-(2-hydroxyethyl)azetidin-3-yl]oxy]-2-phenylethan-1-one, 1st eluting isomer, as a light yellow solid (3.2 mg, 6%), and 1-[5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl]-2-[[1-(2-hydroxyethyl)azetidin-3-yl]oxy]-2-phenylethan-1-one, 2nd eluting isomer, as a light yellow solid (1.8 mg, 3%).
To a solution of 2-phenylacetic acid (79 mg, 0.58 mmol) in N,N-dimethylformamide (2 mL) was added 2-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrole hydrochloride (200 mg, 0.58 mmol), DIEA (0.17 mL, 1.05 mmol) and HATU (331 mg, 0.87 mmol). The resulting mixture was stirred for 2 h at room temperature. The reaction mixture was poured into brine (2 mL) and then extracted with EA (3×2 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 1:20 EA/PE) to afford 1-[5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl]-2-phenylethan-1-one as a light brown solid (150 mg, 61%). LCMS (ES, m/z): 427 [M+H]+.
To a solution of 1-[5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl]-2-phenylethan-1-one (150 mg, 0.35 mmol) in tetrahydrofuran (2 mL) in 8 mL vial was added lithium hexamethyldisilazide (0.5 mL, 1 M in THF) at −60° C. The resulting mixture was stirred for 45 min at −60° C. The reaction was treated with tert-butyl 1-oxa-5-azaspiro[2.3]hexane-5-carboxylate (66 mg, 0.36 mmol). The resulting mixture was allowed to warm to room temperature and stirred overnight. The reaction mixture was poured into brine (2 mL) and then extracted with EtOAc (3×2 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 1:3 EtOAc/petroleum ether) to afford tert-butyl 3-[3-[5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl]-3-oxo-2-phenylpropyl]-3-hydroxyazetidine-1-carboxylate as a light yellow oil (110 mg, 51%). LCMS (ES, m/z): 612 [M+H]+.
To a solution of tert-butyl 3-[3-[5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl]-3-oxo-2-phenylpropyl]-3-hydroxyazetidine-1-carboxylate (110 mg, 0.18 mmol) in dichloromethane (1 mL) was added DAST (29 mg, 0.18 mmol) at 0° C. The resulting mixture was stirred overnight at room temperature. The reaction mixture was poured into brine (2 mL) and then extracted with DCM (3×2 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 1:3 EtOAc/petroleum ether) to afford tert-butyl 3-[3-[5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl]-3-oxo-2-phenylpropyl]-3-fluoroazetidine-1-carboxylate as a light yellow oil (40 mg, 36%). LCMS (ES, m/z): 614 [M+H]+.
To a solution of tert-butyl 3-[3-[5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl]-3-oxo-2-phenylpropyl]-3-fluoroazetidine-1-carboxylate (35 mg, 0.06 mmol) in dichloromethane (1 mL) was added trifluoroacetic acid (0.2 mL) at 0° C. The resulting mixture was stirred for 1 h at room temperature. The pH value of the solution was adjusted to 9 with ammonia (7 M in MeOH) and then concentrated under vacuum. The resulting crude product was purified by Prep-HPLC (Column: XBridge Shield RP18 OBD Column, 5 μm, 19×150 mm; Mobile Phase, A: water (containing 10 mmol/L NH4HCO3) and B: MeCN (5% to 40% over 7 min); Flow rate: 20 mL/min; Detector: UV 254 nm). The product fractions were concentrated under vacuum. The two enantiomers were separated by Chiral Prep-HPLC (Column: CHIRALPAK IC, 5 μm, 20×250 mm; Mobile Phase, A: MeOH (containing 0.1% DEA) and B: DCM (keep 50% B over 15 min); Flow rate: 18 mL/min; Detector: UV 254/220 nm; Retention time: 1st, 7.87 min; 2nd, 11.8 min). The product fractions were concentrated and lyophilized to afford 1-[5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl]-3-(3-fluoroazetidin-3-yl)-2-phenylpropan-1-one, 1st eluting isomer, as a white solid (2.1 mg, 14%), and 1-[5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl]-3-(3-fluoroazetidin-3-yl)-2-phenylpropan-1-one, 2nd eluting isomer, as a white solid (0.4 mg, 3%).
To a solution of 2-((2,3-dihydrobenzo[b][1,4]dioxin-6-yl)sulfonyl)-1,2,3,4,5,6-hexahydropyrrolo[3,4-c]pyrrole core (1 eq) was added (S)-2-((tert-butoxycarbonyl)amino)-2-phenylacetic acid (1.1 eq), HATU (1.2 eq) and DIEA (6 eq). The reaction was stirred at 25° C. for 3 days and then dried under a stream of nitrogen. The material was taken up in 4N HCl in dioxane (13.3 eq) and stirred for 5 h at 50° C. Upon cooling to 23° C., the solvent was removed with a stream of nitrogen and then diluted with toluene. The solvent was azeotroped with toluene by removing with a stream of nitrogen and then dissolved in DCE. To the solution was added methanesulfonic anhydride (3 eq), DIEA (3 eq), and DMAP as a 0.2M solution in DCE (1eq). The reaction stirred at 80° C. for 18 h and was then diluted with Ethyl Acetate and brine. The organic layer was collected, dried under a stream of nitrogen, and submitted for HPLC purification.
To a solution of 2-((2,3-dihydrobenzo[b][1,4]dioxin-6-yl)sulfonyl)-1,2,3,4,5,6-hexahydropyrrolo[3,4-c]pyrrole (30 umol) and aryl bromide (30 mmol) in dioxane was added Cs2CO3 (3 eq), Pd(PPh3)4(0.1 eq) and secondary amine added as a 0.2 M solution in dioxane. The reaction was shaken at 100° C. for 18 h. The products were dried under a stream of nitrogen and diluted with dioxane (200 uL) and 4M HCl in dioxane (100 uL). The reaction was shaken at 50° C. for 4 h. The products were dried under a stream of nitrogen and sulfonyl chloride (43 umol) as a 0.2 M solution in dioxane was added. The reaction was shaken at 23° C. for 18 h. The products were dried under a stream of nitrogen and the material was diluted with EtOAc (0.5 mL) and shaken at 50° C. until solid material was dissolved. LLSE w/ DMT SPE cartridges was performed. 0.5 mL of brine was added and the organic layer was extracted to DMT columns. 0.5 mL EtOAc was added to vials and extracted with DMT columns. The columns were washed with 3 mL of 3:1 EtOAc/MeOH. The solutions were dried and dissolved in 0.5 mL DMSO for preparatory reverse phase HPLC.
To a solution of tert-butyl 3,4,5,6-tetrahydropyrrolo[3,4-c]pyrrole-2(1H)-carboxylate (1 eq) and (R)-2-hydroxy-2-(2-methylbenzo[d]oxazol-4-yl)acetic acid (1.1 eq) was added HATU (1.2 eq), and DIEA (5 eq) at 50° C. for 2 hours. The reaction was concentrated under a stream of nitrogen and diluted with Ethyl Acetate and saturated aqueous sodium bicarbonate solution. The organic layers were collected and dried under vacuum. The material was treated with 4N HCl in dioxane at 50° C. for two hours and then concentrated under a stream of nitrogen. Water was removed by adding toluene and concentrating under a stream of nitrogen. To the material was added benzofuran-6-sulfonyl chloride as a solution in DCE and DIEA (5 eq). After two hours, the solvent was removed under a stream of nitrogen and the residue was diluted with ethyl acetate and aqueous saturated sodium bicarbonate solution. The organic layers were collected, concentrated under a stream of nitrogen and submitted for HPLC purification.
To a solution of 2-(3-bromophenyl)-1-(5-((2,3-dihydrobenzo[b][1,4]dioxin-6-yl)sulfonyl)-5,6-dihydropyrrolo[3,4-c]pyrrol-2(1H,3H,4H)-yl)-2-hydroxyethanone (0.2 M anhydrous 1,4-dioxane, 100 μL, 20 μmol) was added morpholine (0.2 M anhydrous 1,4-dioxane, 150 μL, 30 μmol), XPhos Pd-G2 precatalyst (0.02 M anhydrous 1,4-dioxane, 50 μL, 1 μmol) and cesium carbonate (26 mg, 0.08 mmol). The resulting mixture was heated under nitrogen atmosphere at 100° C. overnight. After cooling to room temperature, the mixture was diluted with brine (0.35 mL) and EtOAc (0.5 mL). The organic layer was separated and the aqueous layer was extracted again with EtOAc (0.6 mL). The combined organic layers were concentrated in vacuo, and the residue was purified by HPLC. RuPhos 3G can also be used as catalyst in arylhalide/amine crosscoupling reactions.
To a solution of 1-(5-[2H,3H-[1,4]dioxino[2,3-b]pyridine-7-sulfonyl]-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl)-2-hydroxy-2-(2-methyl-1,3-benzoxazol-4-yl)ethan-1-one (100 mg, 0.20 mmol) in dichloromethane (5 mL), was added iodomethane (316 mg, 2.23 mmol) and silver oxide (140 mg, 0.60 mmol). The resulting mixture was stirred for 24 h at room temperature. The reaction mixture was filtered and concentrated under vacuum. The enantiomers were separated by Chiral Prep-HPLC (Column: CHIRAL IC, 2×25 cm, 5 μm; Mobile Phase A: DCM, Mobile Phase B: MeOH; Flow rate: 17 mL/min; Gradient: 50 B to 50 B over 17 min; Detector: UV 254/220 nm; Retention time: 1st, 12.78 min; 2nd, 15.03 min). The product fractions were concentrated and lyophilized to afford 1-(5-[2H,3H-[1,4]dioxino[2,3-b]pyridine-7-sulfonyl]-1H,2H,3H,4H,5H,6H-pyrrolo [3,4-c]pyrrol-2-yl)-2-methoxy-2-(2-methyl-1,3-benzoxazol-4-yl)ethan-1-one, 1st eluting isomer, as a white solid (6.3 mg, 6%), and 1-(5-[2H,3H-[1,4]dioxino[2,3-b]pyridine-7-sulfonyl]-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl)-2-methoxy-2-(2-methyl-1,3-benzoxazol-4-yl)ethan-1-one, 2nd eluting isomer, as a white solid (8.0 mg, 8%).
To a solution of 1-(5-[2H,3H-[1,4]dioxino[2,3-b]pyridine-7-sulfonyl]-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl)-2-hydroxy-2-(3-iodophenyl)ethan-1-one (75 mg, 0.12 mmol) in 1,4-dioxane (2 mL), was added 2-oxa-7-azaspiro[3.5]nonane (100 mg, 0.72 mmol), RuPhos (12 mg, 0.024 mmol), potassium phosphate (84 mg, 0.36 mmol) and RuPhos 3G (22 mg, 0.024 mmol). The resulting mixture was stirred for 18 h at 100° C. and then cooled to room temperature. The reaction mixture was poured into water (5 mL) and then extracted with ethyl acetate (3×10 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by Prep-HPLC (Column: XBridge Prep C18 OBD Column, 19×150 mm, 5 μm; Mobile Phase A: water (10 mmol/L NH4HCO3), Mobile Phase B: MeCN; Gradient: 25% B to 55% B over 7 min; Flow rate: 20 mL/min; Detector: UV 254 nm). The product fractions were concentrated under vacuum. The two enantiomers were separated by Chiral Prep-HPLC (Column: CHIRALPAK IF, 2×25 cm, 5 μm; Mobile Phase A: DCM, Mobile Phase B: MeOH; Flow rate: 17 mL/min; Gradient: 50 B to 50 B over 12 min; Detector: UV 254/220 nm; Retention time: 1st, 8.01 min; 2nd, 10.07 min). The product fractions were concentrated and lyophilized to afford 1-(5-[2H,3H-[1,4]dioxino[2,3-b]pyridine-7-sulfonyl]-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl)-2-hydroxy-2-(3-[2-oxa-7-azaspiro[3.5]nonan-7-yl]phenyl)ethan-1-one, 1st eluting isomer, as a white solid (6.2 mg, 9%), and 1-(5-[2H,3H-[1,4]dioxino[2,3-b]pyridine-7-sulfonyl]-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl)-2-hydroxy-2-(3-[2-oxa-7-azaspiro[3.5]nonan-7-yl]phenyl)ethan-1-one, 2nd eluting isomer, as a white solid (6.2 mg, 9%).
To a solution of 2-(2,3-dihydro-1-benzofuran-7-yl)-2-oxoacetic acid (250 mg, 1.30 mmol) in DMF (4 mL) was added 2-[2H,3H-[1,4]dioxino[2,3-b]pyridine-7-sulfonyl]-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrole (450 mg, 1.30 mmol), DIEA (0.43 mL, 2.60 mmol), and HATU (544 mg, 1.43 mmol). The resulting solution was stirred for 1 h at room temperature. The reaction mixture was poured into water (10 mL) and then extracted with ethyl acetate (3×10 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by prep-TLC (eluting with 1:1 ethyl acetate/petroleum ether) to afford 1-(2,3-dihydro-1-benzofuran-7-yl)-2-(5-{2H,3H-[1,4]dioxino[2,3-b]pyridine-7-sulfonyl}-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl)ethane-1,2-dione as a light yellow solid (200 mg, 32%). LCMS (ES, m/z): 484 [M+H]+.
To a solution of 1-(2,3-dihydro-1-benzofuran-7-yl)-2-(5-{2H,3H-[1,4]dioxino[2,3-b]pyridine-7-sulfonyl}-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl)ethane-1,2-dione (200 mg, 0.41 mmol) in tetrahydrofuran (2 mL) was added sodium borohydride (8 mg, 0.21 mmol). The resulting solution was stirred for 30 min at 0° C. The reaction mixture was poured into water (10 mL) and then extracted with ethyl acetate (3×10 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by Prep-HPLC (Column: XBridge Shield RP18 OBD Column, 5 μm, 19×150 mm; Mobile Phase, A: water (containing 10 mmol/L NH4HCO3) and B: MeCN (15% to 45% over 10 min); Flow rate: 20 mL/min; Detector: UV 254 nm). The product fractions were concentrated under vacuum. The two enantiomers were separated by Chiral Prep-HPLC (Column: CHIRALPAK IF, 5 μm, 20×250 mm; Mobile Phase, A: MeOH (containing 0.1% DEA) and B: DCM (keep 40% B over 50 min); Flow rate: 15 mL/min; Detector: UV 254/220 nm; Retention time: 1st, 19.223 min; 2nd, 29.404 min). The product fractions were concentrated and lyophilized to afford 2-(2,3-dihydro-1-benzofuran-7-yl)-1-(5-{2H,3H-[1,4]dioxino[2,3-b]pyridine-7-sulfonyl}-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl)-2-hydroxyethan-1-one, 1st eluting isomer, as a white solid (30.5 mg, 15%), and 2-(2,3-dihydro-1-benzofuran-7-yl)-1-(5-{2H,3H-[1,4]dioxino[2,3-b]pyridine-7-sulfonyl}-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl)-2-hydroxyethan-1-one, 2nd eluting isomer, as a white solid (33.5 mg, 17%).
To tert-butyl (R)-(3-(5-((2,3-dihydrobenzo[b][1,4]dioxin-6-yl)sulfonyl)-3,4,5,6-tetrahydropyrrolo[3,4-c]pyrrol-2(1H)-yl)-3-oxo-2-phenylpropyl)carbamate (180 μl, 36.0 μmol; 0.2M in dioxane) was added acetic acid (150 μl, 30.0 μmol; 0.2M in dioxane) and DCE, cyclopentanecarbaldehyde (180 μl, 36.0 μmol; 0.2M in dioxane) and sodium triacetoxyborohydride (300 μl, 60.0 μmol; 0.2M in dioxane). The reaction was heated at 50° C. for 4 h. The reaction was run through an SCX-SPE cartridge and eluted with 2 ml of 10% MeOH/EtOAc (ETW) followed by 2 ml of 2M Ammonia/MeOH (ETC). The basic eluent was dried under a stream of N2 and the product was purified by reverse phase HPLC.
A mixture of impure (1S)-2-(5-(2,3-dihydrobenzo[b][1,4]dioxine-6-sulfonimidoyl)-3,4,5,6-tetrahydropyrrolo[3,4-c]pyrrol-2(1H)-yl)-2-oxo-1-phenylethyl acetate (100.5 mg, 0.208 mmol) (about half the material is already deacetylated) and potassium carbonate (35.0 mg, 0.253 mmol) was treated with MeOH (6 ml) and stirred at ambient temperature 70 minutes. The solution was diluted with EtOAc (75 mL) and washed sequentially with water (75 mL) and brine (25 mL). The organic layer was dried (Na2SO4), filtered, treated with silica gel, and evaporated under reduced pressure. The material was chromatographed by Biotage MPLC (10 g silica gel column, 0 to 4% MeOH in DCM) to provide (2S)-1-(5-(2,3-dihydrobenzo[b][1,4]dioxine-6-sulfonimidoyl)-3,4,5,6-tetrahydropyrrolo[3,4-c]pyrrol-2(1H)-yl)-2-hydroxy-2-phenylethan-1-one (31.9 mg, 0.072 mmol, 34.8% yield).
Into a 2000-mL 3-necked round-bottom flask, was placed 3-methyl-2-nitrophenol (50 g, 326.51 mmol, 1.00 equiv), HOAc (405 mL), Ac2O (400 mL), H2SO4 (60 mL). Then Cr2O3(70 g, 460.56 mmol, 2.14 equiv) was added at 5-10° C. After the addition was completed, stirring was continued for 6 h at the temperature and the dark green mixture was then poured into ice-water. Stirring was continued for 1 h then the mixture was placed in refrigeratory overnight whereupon the reaction product which had solidified was collected and washed with cold water until colorless. The solids were then digested and stirred mechanically for 1.5 h with 360 mL of cold 2% Na2CO3 solution. The orange mixture was filtered and the solid washed with water. After drying there was obtained 27 g of colorless material which was hydrolyzed by refluxing for 1.5 h with EtOH (60 mL), H2O (16 mL), con. HCl (98 mL). The mixture was concentrated under vacuum to give 6.8 g (10%) of 3-hydroxy-2-nitrobenzaldehyde as a brown solid. GCMS (EI, m/z): 167.
Into a 500-mL 3-necked round-bottom flask, was placed 3-hydroxy-2-nitrobenzaldehyde (4.4 g, 26.33 mmol, 1.00 equiv), DCM (200 mL). This was followed by the addition of TMSCN (7.8 g, 78.62 mmol, 3.00 equiv) and ZnI2 (829 mg, 2.60 mmol, 0.10 equiv) at 0° C. The resulting solution was stirred for 3 h at room temperature (15° C.). The reaction was then quenched by the addition of 200 mL of brine. The resulting solution was extracted with 3×300 mL of DCM, dried over anhydrous Na2SO4, filtered and concentrated under vacuum. The residue was applied onto a silica gel column with EA/PE (1:1) to afford 1.8 g (35%) of 2-hydroxy-2-(3-hydroxy-2-nitrophenyl)acetonitrile as a yellow solid. MS (ESI, m/z): 195[M+H]+.
Into a 50-mL round-bottom flask, was placed 2-hydroxy-2-(3-hydroxy-2-nitrophenyl) acetonitrile (1.8 g, 9.27 mmol, 1.00 equiv), MeOH (5 ml). This was followed by the addition of HCl (12 moL/L, 5.7 mL, 68.4 mmol, 7.40 equiv). The resulting solution was stirred for 45 min at 60° C. After cooled to room temperature, the resulting mixture was concentrated under vacuum to afford 1.8 g (85%) of methyl 2-hydroxy-2-(3-hydroxy-2-nitrophenyl)acetate as a yellow solid. MS (ESI, m/z): 228[M+H]+.
Into a 100-mL round-bottom flask, was placed methyl 2-hydroxy-2-(3-hydroxy-2-nitrophenyl)acetate (1.8 g, 7.92 mmol, 1.00 equiv), MeOH (30 mL), Pd/C (180 mg). To the above H2 (g) was introduced in. The resulting mixture was stirred for 4 h at room temperature (13° C.). The solids were filtered out. The resulting mixture was concentrated under vacuum to give 2.0 g (89%, 70% purity) of methyl 2-(2-amino-3-hydroxyphenyl)-2-hydroxyacetate as red oil. The product was used in the next step directly without further purification. MS (ESI, m/z): 198[M+H]+.
Into a 20-mL microwave tube, was placed methyl 2-(2-amino-3-hydroxyphenyl)-2-hydroxyacetate (300 mg, 1.52 mmol, 1.00 equiv), Bi(OTf)3(27 mg, 0.04 mmol, 0.027 equiv), 1,1,1-triethoxyethane (5 mL). The final reaction mixture was irradiated with microwave radiation for 10 min at 85° C. (The reaction was repeated 2 times). After cooled to r.t., the resulting mixture was concentrated under vacuum and purified by silica gel chromatography with PE/EA (0-100%) to give 320 mg (49%) of methyl 2-hydroxy-2-(2-methyl-1,3-benzoxazol-4-yl)acetate as a light yellow solid. MS (ESI, m/z): 222 [M+H]+.
Into a 50-mL round-bottom flask, was placed methyl 2-hydroxy-2-(2-methyl-1,3-benzoxazol-4-yl)acetate (320 mg, 1.45 mmol, 1.00 equiv), THF (5 mL), H2O (2 mL), LiOH (174 mg, 7.27 mmol, 5.00 equiv). The resulting solution was stirred for 10 min at room temperature (15° C.). The resulting mixture was concentrated under vacuum, the residue was purified by Flash with the following conditions (IntelFlash-1): Column, C18 silica gel; mobile phase, 10 mmoL/L NH4HCO3 in H2O/ACN=100%/0% increasing to 10 mmoL/L NH4HCO3 in H2O/ACN=70%/30% within 30 min; Detector, UV 220 nm. The collected fraction was concentrated under vacuum to afford 150 mg (crude) of lithium 2-hydroxy-2-(2-methylbenzo[d]oxazol-4-yl)acetate as yellow oil. MS (ESI, m/z): 208 [M+H]+.
Into a 50-mL round-bottom flask, was placed lithium 2-hydroxy-2-(2-methylbenzo[d]oxazol-4-yl)acetate (67 mg, crude), 2-2H,3H-[1,4]dioxino[2,3-b]pyridine-7-sulfonyl-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrole (100 mg, 0.32 mmol, 1.00 equiv), DMF (10 mL), HATU (148 mg, 0.39 mmol, 1.20 equiv), DIEA (126 mg, 0.974 mmol, 3.00 equiv). The resulting solution was stirred for 1 h at room temperature (18° C.). The mixture was purified by Prep-HPLC with the following conditions (2 #-Analyse HPLC-SHIMADZU (HPLC-10)): Column: XBridge C18 OBD Prep Column, 100A, 5 um, 19 mm×250 mm; Mobile Phase A: H2O (10 mmoL/L NH4HCO3), Mobile Phase B: ACN; Flow rate: 20 mL/min; Gradient: 14% B to 44% B in 8 min; 254 nm. The collected fraction was lyophilized to give 30 mg (19%) of 1-(5-[2H,3H-[1,4]dioxino[2,3-b]pyridine-7-sulfonyl]-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl)-2-hydroxy-2-(2-methyl-1,3-benzoxazol-4-yl)ethan-1-one as a white solid. MS (ESI, m/z): 499 [M+H]+.
1-(5-[2H,3H-[1,4]dioxino[2,3-b]pyridine-7-sulfonyl]-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl)-2-hydroxy-2-(2-methyl-1,3-benzoxazol-4-yl)ethan-1-one (30 mg, 0.06 mmol, 1.00 equiv) was separated by Chiral-Prep-HPLC with the following conditions (Prep-HPLC-009): Column: CHIRALPAK IF, 250×20 mm; Mobile Phase A: DCM-HPLC, Mobile Phase B: MeOH-HPLC; Flow rate: 16 mL/min; Gradient: 60 B to 60 B in 18 min; 254/220 nm. The first eluting isomer (Rt=11.23 min) was collected and concentrated under vacuum then lyophilized to give 5.1 mg (17%) of (2S)-1-(5-[2H,3H-[1,4]dioxino[2,3-b]pyridine-7-sulfonyl]-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl)-2-hydroxy-2-(2-methyl-1,3-benzoxazol-4-yl)ethan-1-one as a white solid. The second eluting isomer (Rt=15.39 min) was collected and concentrated under vacuum then lyophilized to give 9.2 mg (31%) of (2R)-1-(5-[2H,3H-[1,4]dioxino[2,3-b]pyridine-7-sulfonyl]-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl)-2-hydroxy-2-(2-methyl-1,3-benzoxazol-4-yl)ethan-1-one as a white solid.
First eluting isomer: 1H-NMR (400 MHz, DMSO-d6) δ (ppm): 2.63 (s, 3H), 3.88-4.13 (m, 7H), 4.32-4.40 (m, 3H), 4.50-4.52 (m, 2H), 5.70 (s, 2H), 7.32-7.33 (m, 2H), 7.58-7.63 (m, 2H), 8.16 (d, J=2.4 Hz, 1H). MS (ESI, m/z): 499 [M+H]+. ee=100%.
Second eluting isomer: 1H-NMR (400 MHz, DMSO-d6) δ (ppm): 2.63 (s, 3H), 3.88-4.13 (m, 7H), 4.32-4.40 (m, 3H), 4.50-4.52 (m, 2H), 5.70 (s, 2H), 7.31-7.33 (m, 2H), 7.58-7.63 (m, 2H), 8.16 (d, J=2.4 Hz, 1H). MS (ESI, m/z): 499 [M+H]+. ee=99.4%.
To a mixture of 4-bromo-2-methyl-1,3-benzothiazole (2.1 g, 9.21 mmol) in 1,4-dioxane (70 mL) was added (tributylstannyl)methanol (3.84 g, 11.96 mmol), Pd(PPh3)4 (1.6 g, 1.38 mmol). The resulting mixture was stirred overnight at 100° C. The reaction was then quenched by the addition of NH4Cl (sat.aq)(100 mL). The resulting solution was extracted with 3×100 mL of ethyl acetate and the organic layers combined, dried over anhydrous sodium sulfate and concentrated under vacuum. The residue was applied onto a silica gel column with ethyl acetate/petroleum ether (4:1). This resulted in 1.2 g (73%) of (2-methyl-1,3-benzothiazol-4-yl)methanol as yellow oil. LCMS (ES, m/z) 180 [M+H]+
To a solution of oxalic dichloride (1.7 g, 13.39 mmol) in dichloromethane (30 mL) was added DMSO (1.57 g, 20.09 mmol) dropwise at −78° C. The mixture was stirred for 0.5 h at −78° C., then a solution of (2-methyl-1,3-benzothiazol-4-yl)methanol (1.2 g, 6.69 mmol) in dichloromethane (10 mL) was added at −78° C. and stirred for 2 h, at last, TEA (4.06 g, 40.12 mmol, 6.00 equiv) was added at −78° C. The mixture was stirred for 2 h from −78° C. to room temperature. The reaction was then quenched by the addition of 30 mL of brine. The resulting solution was extracted with 3×30 mL of dichloromethane and the organic layers combined and dried over anhydrous sodium sulfate and concentrated under vacuum. This resulted in 0.9 g (76%) of 2-methyl-1,3-benzothiazole-4-carbaldehyde as a yellow solid. LCMS (ES, m/z) 178 [M+H]+
To a mixture of 2-methyl-1,3-benzothiazole-4-carbaldehyde (900 mg, 5.08 mmol) in dichloromethane (15 mL) was added TMSCN (1.51 g, 15.22 mmol) and ZnI2 (162 mg, 0.51 mmol). The mixture was stirred for 2 h at 25° C. The reaction was then quenched by the addition of brine, extracted with 3×30 mL of dichloromethane and the organic layers combined and dried over anhydrous sodium sulfate and concentrated under vacuum. This resulted in 0.8 g (65%) of 2-hydroxy-2-(2-methyl-1,3-benzothiazol-4-yl)acetonitrile as light yellow oil. LCMS (ES, m/z) 205 [M+H]+
To a mixture of 2-hydroxy-2-(2-methyl-1,3-benzothiazol-4-yl)acetonitrile (800 mg, 3.92 mmol) in methanol (30 mL) was added hydrogen chloride (30 mL, 36.5%), The resulting solution was stirred for 4 h at 60° C. The reaction was then quenched by the addition of 30 mL of brine, extracted with 3×30 mL of ethyl acetate and the organic layers combined, concentrated under vacuum. This resulted in 300 mg of methyl 2-hydroxy-2-(2-methyl-1,3-benzothiazol-4-yl)acetate as light yellow oil. LCMS (ES, m/z) 238 [M+H]+
To a mixture of 2-hydroxy-2-(2-methyl-1,3-benzothiazol-4-yl)acetic acetate (500 mg, 2.24 mmol) in tetrahydrofuran (3 mL). was added a solution of lithium hydroxide (253 mg, 10.56 mmol) in water (3 mL), The resulting solution was stirred overnight at room temperature. The resulting solution was diluted with 30 mL of H2O. The resulting solution was extracted with 3×10 mL of ether and the aqueous layers combined. The pH value of the solution was adjusted to 5 with HCl (4M, aq). The resulting solution was extracted with 3×30 mL of ethyl acetate and the organic layers combined and dried over anhydrous sodium sulfate and concentrated under vacuum. This resulted in 300 mg (58%) of 2-hydroxy-2-(2-methyl-1,3-benzothiazol-4-yl)acetic acid as a light yellow solid. LCMS (ES, m/z) 224 [M+H]+
To a mixture of 2-hydroxy-2-(2-methyl-1,3-benzothiazol-4-yl)acetic acid (112 mg, 0.49 mmol) and 2-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrole; trifluoroacetic acid (203 mg, 0.46 mmol) in N,N-dimethylformamide (4 mL), were added DIEA (129 mg, 1.00 mmol), EDCI (105 mg, 0.55 mmol), HOBt (74 mg, 0.55 mmol). The mixture was stirred for 2 h at room temperature. The resulting solution was diluted with water (30 mL), extracted with 3×30 of ethyl acetate and the organic layers combined and concentrated under vacuum. The crude product was purified by Prep-HPLC with the following conditions: Column: XBridge Shield RP18 OBD Column, 5 μm, 19×150 mm; Mobile Phase A: water (0.05% TFA), Mobile Phase B: ACN; Flow rate: 20 mL/min; Gradient: 25% B to 50% B in 10 min; 254 nm; Rt: 8 min.
The two enantiomers were separated by Chiral-Prep-HPLC with the following conditions: Column: CHIRALPAK IF, 2×25 cm, 5 um; Mobile Phase A: DCM-HPLC, Mobile Phase B: MeOH-HPLC; Flow rate: 16 mL/min; Gradient: 50 B to 50 B in 25 min; 220/254 nm; RT1:17.97; RT2:21.34. This resulted in 13.9 mg (6%) of (2S)-1-[5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl]-2-hydroxy-2-(2-methyl-1,3-benzothiazol-4-yl)ethan-1-one (first eluting isomer) as a white solid. And 10.4 mg (4%) of (2R)-1-[5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl]-2-hydroxy-2-(2-methyl-1,3-benzothiazol-4-yl)ethan-1-one (second eluting isomer) as a white solid. Absolute stereochemistry was determined.
(2S)-1-[5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl]-2-hydroxy-2-(2-methyl-1,3-benzothiazol-4-yl)ethan-1-one (first eluting isomer: 1H NMR (400 MHz, CDCl3) δ 7.81 (d, J=5.8 Hz, 1H), 7.39-7.31 (m, 2H), 7.30-7.25 (m, 2H), 6.99-6.93 (m, 1H), 6.09 (s, 1H), 4.38-4.25 (m, 6H), 4.20-4.02 (m, 4H), 4.00-3.89 (m, 1H), 3.59-3.50 (m, 1H), 2.89 (s, 3H), 1.25 (s, 1H). LCMS (ES, m/z) 514 [M+H]+
(2R)-1-[5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl]-2-hydroxy-2-(2-methyl-1,3-benzothiazol-4-yl)ethan-1-one (second eluting isomer): 1H NMR (400 MHz, CDCl3) δ 7.81 (d, J=5.8 Hz, 1H), 7.38-7.31 (m, 2H), 7.30-7.25 (m, 2H), 6.99-6.93 (m, 1H), 6.11 (s, 1H), 4.38-4.25 (m, 6H), 4.16-4.02 (m, 4H), 4.00-3.89 (m, 1H), 3.59-3.50 (m, 1H), 2.91 (s, 3H), 1.25 (s, 1H). LCMS (ES, m/z) 514 [M+H]+
To a solution of ethyl 2-(diethoxyphosphoryl)-2-fluoroacetate (10 g, 40.5 mmol) in THF (60 mL), was added n-BuLi (16.5 mL, 2.5 M in hexane) at −78° C. and stirred for 1 h, then tert-butyl N-(2-oxoethyl)carbamate (6.57 g, 40.4 mmol) in THF (10 mL) was added. The resulting solution was stirred for 3 h at −78° C. The reaction mixture was poured into saturated sodium bicarbonate (100 mL) and then extracted with ethyl acetate (3×100 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 20:80 ethyl acetate/petroleum ether) to afford ethyl (2E)-4-{[(tert-butoxy)carbonyl]amino}-2-fluorobut-2-enoate as light yellow oil (4.1 g, 38.93%). LCMS (ES, m/z): 248 [M+H]+.
To a solution of ethyl (2E)-4-[[(tert-butoxy)carbonyl]amino]-2-fluorobut-2-enoate (2.5 g, 10.111 mmol) in TFA (100 mL) and DCM (0.1 mL) was added benzyl(methoxymethyl)[(trimethylsilyl)methyl]amine (2.64 mg, 11.1 mmol). The resulting solution was stirred for 16 h at 25° C. and then concentrated under vacuum. The crude product was purified by silica gel chromatography (eluting with 0:100 to 10:90 ethyl acetate/petroleum ether) to afford ethyl (3S,4R)-1-benzyl-4-({[(tert-butoxy)carbonyl]amino}methyl)-3-fluoropyrrolidine-3-carboxylate as light yellow oil (1.2 g, 31.20%). LCMS (ES, m/z): 381 [M+H]+.
To a solution of ethyl (3S,4R)-1-benzyl-4-({[(tert-butoxy)carbonyl]amino}methyl)-3-fluoropyrrolidine-3-carboxylate (1.20 g, 3.15 mmol) in DCM (20 mL) was added TFA (10 mL). The resulting solution was stirred for 2 h at 25° C. and then concentrated under vacuum. The reaction mixture was poured into saturated sodium bicarbonate (100 mL) and then extracted with dichloromethane (3×100 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum to afford (3aR,6aS)-5-benzyl-6a-fluoro-octahydropyrrolo[3,4-c]pyrrol-1-one as a white solid (510 mg, 69.02%). LCMS (ES, m/z): 235 [M+H]+.
To a solution of (3aR,6aS)-5-benzyl-6a-fluoro-octahydropyrrolo[3,4-c]pyrrol-1-one (500 mg, 2.13 mmol) in THF (10 mL) was added 1.0 M BH3-THF (10.8 mL, 10.7 mmol). The resulting solution was stirred for 16 h at 60° C. and quenched by the addition of 10 mL of 1.0 M HCl and stirred for 2 h at 60° C., concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 10:90 methylene chloride/methanol) to afford (3aR,6aR)-2-benzyl-3a-fluoro-octahydropyrrolo[3,4-c]pyrrole as light yellow oil (300 mg, 63.81%). LCMS (ES, m/z): 221 [M+H]+.
To a solution of (3aR,6aR)-2-benzyl-3a-fluoro-octahydropyrrolo[3,4-c]pyrrole (300 mg, 1.36 mmol) in MeOH (15 mL) was added HCHO (2 mL) and stirred for 30 min, then STAB (865 mg, 4.09 mmol) was added. The resulting solution was stirred for 16 h at 25° C. and then concentrated under vacuum. The resulting crude product was purified by silica gel chromatography (eluting with 0:100 to 10:90 methylene chloride/methanol) to afford (3aR,6aR)-2-benzyl-3a-fluoro-5-methyl-octahydropyrrolo[3,4-c]pyrrole as colorless oil (220 mg, 68.94%). LCMS (ES, m/z): 235 [M+H]+.
To a solution of (3aR,6aR)-2-benzyl-3a-fluoro-5-methyl-octahydropyrrolo[3,4-c]pyrrole (220 mg, 0.939 mmol) in MeOH (15 mL), was added Pd/C (21.9 mg) under hydrogen. The resulting solution was stirred for 3 h at 25° C. The reaction mixture was filtered and concentrated to afford (3aS,6aS)-3a-fluoro-2-methyl-octahydropyrrolo[3,4-c]pyrrole as light yellow oil (100 mg, 73.87%). LCMS (ES, m/z): 145 [M+H]+.
To a solution of (3aS,6aS)-3a-fluoro-2-methyl-octahydropyrrolo[3,4-c]pyrrole (85 mg, 0.59 mmol) in toluene (15 mL), was added RuPhos (27.5 mg, 0.06 mmol), RuPhos Palladacycle Gen.3 (49.3 mg, 0.06 mmol), 2-(3-bromophenyl)-1-[5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl]-2-hydroxyethan-1-one (307 mg, 1.77 mmol) and cesium carbonate (577 mg, 1.77 mmol). The resulting solution was stirred for 16 h at 100° C. and cooled to room temperature. The reaction mixture was poured into water (50 mL) and then extracted with ethyl acetate (3×50 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered, and concentrated under vacuum. The resulting crude product was purified by Prep-HPLC (Column: XBridge Shield RP18 OBD Column, 5 μm, 19×150 mm; Mobile Phase, A: water (containing 10 mmol/L NH4HCO3) and B: CH3CN (30% to 60% over 7 min); Flow rate: 25 mL/min; Detector: UV 254 nm; Rt: 6.5 min). The product fractions were concentrated under vacuum. The two enantiomers were further separated by Chiral Prep-HPLC (Column: CHIRALPAK IE, 5 μm, 20×250 mm; Mobile Phase, A: MTBE (containing 0.2% IPA) and B: MeOH (keep 50% B over 30 min); Flow rate: 13 mL/min; Detector: UV 254/220 nm; M1, 16.249 min; M2, 23.328 min). From M1: Column: CHIRAL ART Amylose-SA S-5 um, 250×20 mm; Mobile Phase A: CO2: 65, Mobile Phase B: MeOH:DCM=1:1(2 nM NH3-MEOH): 35; Flow rate: 50 mL/min; 220 nm; 0A: RT:14.53 min; 0B: RT:16.5 min. From M2: Column: Chiralpak IA, 20×250 mm, 5 um; Mobile Phase A: MTBE (containing 0.2% IPA), Mobile Phase B: EtOH; Flow rate: 12 mL/min; Gradient: 50 B to 50 B in 40 min; 220/254 nm; OC: RT: 24.603 min; OD: RT: 32.591 min. The product fractions were concentrated and lyophilized to afford (2S)-2-{3-[(3aR,6aR)-3a-fluoro-5-methyl-octahydropyrrolo[3,4-c]pyrrol-2-yl]phenyl}-1-[5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl]-2-hydroxyethan-1-one as a white solid (1.3 mg, 0.38%). (2R)-2-{3-[(3aR,6aR)-3a-fluoro-5-methyl-octahydropyrrolo[3,4-c]pyrrol-2-yl]phenyl}-1-[5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl]-2-hydroxyethan-1-one as a white solid (2.0 mg, 0.58%). (2S)-2-{3-[(3aS,6aS)-3a-fluoro-5-methyl-octahydropyrrolo[3,4-c]pyrrol-2-yl]phenyl}-1-[5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl]-2-hydroxyethan-1-one as a white solid (5.7 mg, 1.6%). (2R)-2-{3-[(3aS,6aS)-3a-fluoro-5-methyl-octahydropyrrolo[3,4-c]pyrrol-2-yl]phenyl}-1-[5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl]-2-hydroxyethan-1-one as a white solid (5.3 mg, 1.5%).
(2S)-2-{3-[(3aR,6aR)-3a-fluoro-5-methyl-octahydropyrrolo[3,4-c]pyrrol-2-yl]phenyl}-1-[5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl]-2-hydroxyethan-1-one (first eluting isomer): 1H NMR (400 MHz, DMSO-d6) δ: 7.28-7.23 (m, 2H), 7.17-7.13 (m, 1H), 7.06 (d, J=8.4 Hz, 1H), 6.70-6.68 (m, 2H), 6.63-6.61 (m, 1H), 5.52 (d, J=6.8 Hz, 1H), 5.07 (d, J=6.4 Hz, 1H), 4.33-4.29 (m, 4H), 4.26-4.22 (m, 1H), 4.14-4.08 (m, 1H), 4.05-3.96 (m, 5H), 3.95-3.82 (m, 1H), 3.65-3.40 (m, 3H), 3.02-2.96 (m, 1H), 2.95-2.71 (m, 4H), 2.38-2.31 (m, 1H), 2.24 (s, 3H). LCMS (ES, m/z) 585 [M+H]+.
(2R)-2-{3-[(3aR,6aR)-3a-fluoro-5-methyl-octahydropyrrolo[3,4-c]pyrrol-2-yl]phenyl}-1-[5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl]-2-hydroxyethan-1-one (second eluting isomer): 1H NMR (400 MHz, DMSO-d6) δ: 7.28-7.23 (m, 2H), 7.17-7.13 (m, 1H), 7.06 (d, J=8.4 Hz, 1H), 6.70-6.68 (m, 2H), 6.63-6.61 (m, 1H), 5.52 (d, J=6.8 Hz, 1H), 5.07 (d, J=6.4 Hz, 1H), 4.33-4.29 (m, 4H), 4.26-4.22 (m, 1H), 4.14-4.08 (m, 1H), 4.05-3.96 (m, 5H), 3.95-3.82 (m, 1H), 3.65-3.40 (m, 3H), 3.02-2.96 (m, 1H), 2.95-2.71 (m, 4H), 2.38-2.31 (m, 1H), 2.26 (s, 3H). LCMS (ES, m/z) 585 [M+H]+.
(2S)-2-{3-[(3aS,6aS)-3a-fluoro-5-methyl-octahydropyrrolo[3,4-c]pyrrol-2-yl]phenyl}-1-[5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl]-2-hydroxyethan-1-one (third eluting isomer): 1H NMR (400 MHz, DMSO-d6) δ: 7.28-7.23 (m, 2H), 7.17-7.13 (m, 1H), 7.06 (d, J=8.4 Hz, 1H), 6.70-6.68 (m, 2H), 6.63-6.61 (m, 1H), 5.52 (d, J=6.8 Hz, 1H), 5.07 (d, J=6.4 Hz, 1H), 4.33-4.29 (m, 4H), 4.26-4.22 (m, 1H), 4.14-4.08 (m, 1H), 4.05-3.96 (m, 5H), 3.95-3.82 (m, 1H), 3.65-3.40 (m, 3H), 3.02-2.96 (m, 1H), 2.95-2.71 (m, 4H), 2.38-2.31 (m, 1H), 2.26 (s, 3H). LCMS (ES, m/z) 585 [M+H]+. LCMS (ES, m/z) 585 [M+H]+
(2R)-2-{3-[(3aS,6aS)-3a-fluoro-5-methyl-octahydropyrrolo[3,4-c]pyrrol-2-yl]phenyl}-1-[5-(2,3-dihydro-1,4-benzodioxine-6-sulfonyl)-1H,2H,3H,4H,5H,6H-pyrrolo[3,4-c]pyrrol-2-yl]-2-hydroxyethan-1-one (fourth eluting isomer): 1H NMR (400 MHz, DMSO-d6) δ: 7.28-7.23 (m, 2H), 7.17-7.13 (m, 1H), 7.06 (d, J=8.4 Hz, 1H), 6.70-6.68 (m, 2H), 6.63-6.61 (m, 1H), 5.52 (d, J=6.8 Hz, 1H), 5.07 (d, J=6.4 Hz, 1H), 4.33-4.29 (m, 4H), 4.26-4.22 (m, 1H), 4.14-4.08 (m, 1H), 4.05-3.96 (m, 5H), 3.95-3.82 (m, 1H), 3.65-3.40 (m, 3H), 3.02-2.96 (m, 1H), 2.95-2.71 (m, 4H), 2.38-2.31 (m, 1H), 2.26 (s, 3H). LCMS (ES, m/z) 585 [M+H]+. LCMS (ES, m/z) 585 [M+H]+
As set forth in Tables 22 and 23, IC50 values are defined as follows: ≤25 μM and >2 μM (+); ≤2 μM and >0.2 μM (++); ≤0.2 μM and >0.05 μM (+++); ≤0.05 μM and >0.001 μM (++++); and not tested (−−), based upon the Biochemical Assay of Example 1.
In Tables 1 and 22, absolute stereochemistry has not been determined for some Examples. Accordingly, assignment ofany Examples as the “R” or “S” stereoisomer is arbitrary, unless otherwise noted. In some cases, Examples are labeled with “1st eluting isomer” ˜, “2nd eluting isomer”, etc. based on the purification method used to separate the stereoisomers (see Table 21).
1H NMR
2H4)-1,4-benzodioxine-6-
2H4)-1,4-benzodioxine-6-
Those skilled in the art will recognize, or be able to ascertain, using no more than routine experimentation, numerous equivalents to the specific embodiments described specifically herein. Such equivalents are intended to be encompassed in the scope of the following claims.
Embodiment 1. A compound of Formula I
or a pharmaceutically acceptable salt thereof, wherein:
Embodiment 2. The compound of embodiment 1, wherein W is CR1′R2′.
Embodiment 3. The compound of embodiment 1 or 2, wherein R1′ and R2′ are each independently selected from the group consisting of —H, halogen, —C1-C6alkyl, —(CRbRc)nC3-C12cycloalkyl, —(CRbRc)nheterocyclyl, —(CRbRc)nNR2, —(CRbRc)nNRC(O)R′, —(CRbRc)nNRS(O)2R′, —(CRbRc)nNRC(O)NR2, or —(CRbRc)nNRC(O)OR,
Embodiment 4. The compound of any one of embodiments 1-3, wherein R1′ and R2′ are each independently selected from the group consisting of —H, halogen, —C1-C6alkyl, —(CRbRc)nC3-C12cycloalkyl, —(CRbRc)nheterocyclyl, —(CRbRc)nNR2, —(CRbRc)nNRC(O)R′, —(CRbRc)nNRS(O)2R′, —(CRbRc)nNRC(O)NR2, or —(CRbRc)nNRC(O)OR,
Embodiment 5. The compound of any one of embodiments 1-4, wherein R1′ and R2′ are each —H.
Embodiment 6. The compound of embodiment 1, wherein m is 0.
Embodiment 7. The compound of any one of embodiments 1-6, wherein X is CR5R6, CR5, or N.
Embodiment 8. The compound of any one of embodiments 1-7, wherein Z1 is O or S.
Embodiment 9. The compound of any one of embodiments 1-8, wherein Z2 is O or NH.
Embodiment 10. The compound of any one of embodiments 1-9, wherein R3, R4, R5, R6, R7, R8, R9, and R10, if present, are each —H.
Embodiment 11. The compound of any one of embodiments 1-10, wherein Ring A is a 5- to 6-membered heteroaryl containing 1-4 heteroatoms independently selected from the group consisting of O, N, and S, or a 5- to 6-membered heterocyclyl containing 1-4 heteroatoms independently selected from the group consisting of O, N, and S, wherein each heteroaryl or heterocyclyl is optionally substituted with one or more halogen or —C1-C6alkyl.
Embodiment 12. The compound of any one of embodiments 1-11, wherein the compound is of Formula II:
or a pharmaceutically acceptable salt thereof, wherein:
Embodiment 13. The compound of any one of embodiments 1-12, wherein the compound is of Formula II-a:
or a pharmaceutically acceptable salt thereof.
Embodiment 14. The compound of any one of embodiments 1-13, wherein the compound is of Formula II-b:
or a pharmaceutically acceptable salt thereof, wherein:
Embodiment 15. The compound of any one of embodiments 1-14, wherein the compound is of Formula II-c:
or a pharmaceutically acceptable salt thereof, wherein:
Embodiment 16. The compound of any one of embodiments 1-15, wherein the compound is of Formula III:
or a pharmaceutically acceptable salt thereof.
Embodiment 17. The compound of embodiment 16, wherein:
Embodiment 18. The compound of any one of embodiments 1-17, wherein the compound is of Formula III-a:
or a pharmaceutically acceptable salt thereof,
Embodiment 19. The compound of any one of embodiments 1-18, wherein the compound is of Formula III-b:
or a pharmaceutically acceptable salt thereof,
wherein Y2 is CH or N.
Embodiment 20. The compound of any one of embodiments 1-19, wherein the compound is of Formula III-c:
or a pharmaceutically acceptable salt thereof, wherein:
Embodiment 21. The compound of any one of embodiments 1-11, wherein the compound is of Formula IV:
or a pharmaceutically acceptable salt thereof.
Embodiment 22. The compound of embodiment 21, wherein:
Embodiment 23. The compound of any one of embodiments 1-11 and 21-22, wherein the compound is of Formula IV-a:
or a pharmaceutically acceptable salt thereof,
Embodiment 24. The compound of any one of embodiments 1-11 and 21-23, wherein the compound is of Formula IV-b:
or a pharmaceutically acceptable salt thereof,
wherein Y2 is CH or N.
Embodiment 25. The compound of any one of embodiments 1-11, wherein the compound is of Formula V:
or a pharmaceutically acceptable salt thereof.
Embodiment 26. The compound of embodiment 25, wherein:
Embodiment 27. The compound of any one of embodiments 1-11 and 25-26, wherein the compound is of Formula V-a:
or a pharmaceutically acceptable salt thereof,
Embodiment 28. The compound of any one of embodiments 1-11 and 25-27, wherein the compound is of Formula V-b:
or a pharmaceutically acceptable salt thereof,
wherein Y2 is CH or N.
Embodiment 29. The compound of any one of embodiments 1-28, wherein Y3 is CRa.
Embodiment 30. The compound of any one of embodiments 1-29, wherein Y2 is CRa.
Embodiment 31. The compound of any one of embodiments 1-30, wherein Ra is —H.
Embodiment 32. The compound of any one of embodiments 1-31, wherein
is selected from the group consisting of:
Embodiment 33. The compound of any one of embodiments 1-32, wherein
Embodiment 34. The compound of any one of embodiments 1-33, wherein R1 and R2 are each independently —H, halogen, —C1-C6alkyl, —(CRbRc)nC3-C12cycloalkyl, —(CRbRc)nheterocyclyl, —OR, —OC(O)R′, —OS(O)2R′, —OS(O)2NR2, —OC(O)NR2, —OC(O)OR, —(CRbRc)nNR2, —(CRbRc)nNRC(O)R′, —(CRbRc)nNRS(O)2R′, —(CRbRc)nNRC(O)NR2, or —(CRbRc)nNRC(O)OR,
Embodiment 35. The compound of any one of embodiments 1-34, wherein R1 and R2 are each independently selected from the group consisting of —H, halogen, —C1-C6alkyl, —(CRbRc)nC3-C12cycloalkyl, —(CRbRc)nheterocyclyl, —OR, —(CRbRc)nNR2, —(CRbRc)nNRC(O)R′, —(CRbRc)nNRS(O)2R′, or —(CRbRc)nNRC(O)NR2,
Embodiment 36. The compound of any one of embodiments 1-35, wherein R1 and R2 are each independently —H, —OH, or —CH2NHMe.
Embodiment 37. The compound of any one of embodiments 1-36, wherein R2 is —H.
Embodiment 38. The compound of any one of embodiments 1-37, wherein R1 is —OH.
Embodiment 39. The compound of any one of embodiments 1-38, wherein R and R are each —H.
Embodiment 40. The compound of any one of embodiments 1-39, wherein n is 0, 1, or 2.
Embodiment 41. The compound of any one of embodiments 1-40, wherein B is a phenyl ring or a bicyclic ring,
Embodiment 42. The compound of any one of embodiments 1-41, wherein B is a ring selected from the group consisting of:
and wherein the ring is optionally substituted with one or more Rd.
Embodiment 43. The compound of any one of embodiments 1-42, wherein B is phenyl, optionally substituted with one or more Rd.
Embodiment 44. The compound of any one of embodiments 1-43, wherein each Rd is independently selected from the group consisting of halogen, —OR, —NR2, and —C(O)NR2, —C1-C6alkyl, —C3-C12cycloalkyl, 3- to 14-membered heterocyclyl containing 1-4 heteroatoms independently selected from the group consisting of O, N, and S, and C6-C14aryl,
Embodiment 45. The compound of any one of embodiments 1-44, wherein each Rd is independently selected from the group consisting of halogen, —C1-C6alkyl, and —OR.
Embodiment 46. The compound of any one of embodiments 1-45, wherein each R is independently selected from the group consisting of —H, —C1-C6alkyl, —C3-C12cycloalkyl, and 3- to 14-membered heterocyclyl containing 1-4 heteroatoms independently selected from the group consisting of O, N, and S,
Embodiment 47. The compound of any one of embodiments 1-46, wherein each R is independently selected from the group consisting of —H, —C1-C6alkyl, or 3- to 8-membered heterocyclyl optionally substituted with C1-C6alkyl.
Embodiment 48. The compound of any one of embodiments 1-47, wherein each R is —H or —C1-C6alkyl.
Embodiment 49. The compound of any one of embodiments 1-48, wherein each R′ is independently —C1-C6alkyl, —C3-C12cycloalkyl, or 3- to 14-membered heterocyclyl containing 1-4 heteroatoms independently selected from the group consisting of O, N, and S.
Embodiment 50. The compound of any one of embodiments 1-49, wherein each R′ is —C1-C6alkyl.
Embodiment 51. A compound selected from Table 1.
Embodiment 52. A compound of any one of embodiments 1-51, wherein the compound is a USP9X Inhibitor having an IC50 value ≤2 μM in the assay of Example 1.
Embodiment 53. The compound of any one of embodiments 1-52, wherein the compound is a USP9X Inhibitor having an IC50 value ≤0.2 μM in the assay of Example 1.
Embodiment 54. The compound of any one of embodiments 1-53, wherein the compound is a USP9X Inhibitor having an IC50 value ≤0.05 μM in the assay of Example 1.
Embodiment 55. A pharmaceutical composition, comprising a compound of any one of embodiments 1-54, and a pharmaceutically acceptable carrier.
This application claims priority to and the benefit of U.S. Provisional Application No. 62/733,595, filed Sep. 19, 2018, the entire contents of which are incorporated herein by reference.
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/US2019/051841 | 9/19/2019 | WO |
| Number | Date | Country | |
|---|---|---|---|
| 62733595 | Sep 2018 | US |
