Patent Application
20120094986
The present invention relates to novel anticancer derivatives, to the compositions containing them and to the therapeutic use thereof, in particular as anticancer agents. The invention also relates to the process for preparing these compounds and also to some of the intermediate products.
WO 99/31064 describes anticancer compounds of formula (A):
in which A represents in particular an alkylene group in which a methylene unit can be substituted with an O, S, C═O, NH, SO or SO2 fragment in any position not adjacent to the amide unit —C(═O)—NR3—. D represents an alkylene, alkenylene or alkinylene group containing at least 3 carbon atoms, in which from 1 to 3 methylene unit(s) may be substituted with an O, S, C═O, NH, SO or SO2 fragment. G represents in particular the group —(CR9R10)m—R8 in which m is 0 or 1, R9 and R10 can represent a hydrogen atom or an alkyl group, and R8 represents an aralkyl group or an aromatic or heteroaromatic group which is monocyclic, possibly containing from 1 to 3 heteroatoms (N, O or S) or a bicyclic or tricyclic aromatic group. R8 may be optionally substituted with: halogen, —CN, alkyl, fluoroalkyl, cycloalkyl, aralkyl, aryl, —OH, hydroxyalkyl, alkoxy (—O-alkyl), aryloxy (—O-aryl), mercapto (—SH), alkylthio (—S-alkyl), arylthio (—S-aryl), carboxyl (—COOH), carboxyalkyl(-alkyl-COOH), carboxyalkenyl (-alkenyl-COOH), alkoxycarbonyl (—COOalkyl), nitro (—NO2), amino (—NH2), aminoalkyl(-alkyl-NH2), monoalkylamino (—NHalkyl), dialkylamino (—N(alkyl)2). This application describes neither the urea bond —NH—C(═O)—NH— nor the substitution of the nucleus comprising Z and Z′ with the groups —C(═O)NHR2 and —NR1R′1.
US 2006/0040956 describes anticancer compounds of formula (B):
in which A can represent the ring
and R2 represents a group chosen from H, halogen, —OR3, oxo, —SR3, —CO2R3, —COR3, —CONR3R3, —NR3R3, —SO2NR3R3, —NR3COOR3, —NR3COR3, cycloalkyl, optionally substituted phenyl, alkyl, cyano, nitro, etc.
WO 00/50399 describes biologically active compounds, that can be used as anticancer agents, of formula (C):
in which Z represents CH or N and R1-4 represent carbohydrate groups. In particular, R4 may be the group
in which A represents a single bond or a carbohydrate group and R7 represents a carbohydrate group. The 8 compounds described are characterized by one of the following units:
None of these documents describes or suggests the compounds of the invention.
In the context of the present invention:
According to a 1st aspect, a subject of the present invention is a compound of formula (I):
in which:
Z and Z′ represent N or CH. More particularly, Z and Z′ can represent respectively N and CH; CH and CH or N and N:
For the three rings C1-3, W can represent a —(C1-C4)alkylene-CH2CH2—, —(C1-C4)alkylene-CH═CH— or —(C1-C4)alkylene-C≡C— group, the (C1-C4)alkylene group being linked to the —C(═O)—NH— group. The —(C1-C4)alkylene-CH═CH— group may be E or Z.
For the ring C1, W can represent a 1,4-cyclohexylene group (cis or trans) or else a —(CH2)1-4CRR′-group in which the (CH2)1-4 group is linked to the —C(═O)—NH— group and R and R′ represent a fluorine atom or a (C1-C4)alkyl group or form, together with the carbon atom to which they are attached, a cyclopropyl group.
n is an integer that may be equal to 0, 1 or 2. Preferably, n is equal to 1.
R1 represents a hydrogen atom, a (C1-C6)alkyl group, a (C3-C6)cycloalkyl group, for example cyclopropyl, or a phenyl group optionally substituted with a trifluoromethyl group.
R′1 represents a hydrogen atom or the (C1-C6)alkyl group. More particularly, R′1 represents a hydrogen atom. R1 and/or R′1 may be chosen from those described in Table I.
R2 represents:
The heterocycloalkyl group formed by Ra and Rb may, for example, be a
group.
The heterocycloalkyl group formed by Ra and Rb may be optionally substituted with one or more substituent(s), which may be identical to or different from one another when there are several thereof, chosen from: —OH; (C1-C4)alkoxy: for example, methoxy; (C1-C4)alkyl: for example, methyl. Thus, the substituted heterocycloalkyl may be a
group.
R2 may be chosen from one of those described in Table I.
The pyridine nucleus may comprise from 1 to 4 substituents R3 chosen from a hydrogen or fluorine atom, a (C1-C4)alkyl group, a cyano or —NRcRd in which Rc and Rd represent a hydrogen atom or a (C1-C4)alkyl group. R3 may be chosen from those described in Table I. Preferably, R3 is in position 5 and/or 6 on the pyridine nucleus. Preferably, the number of substituents R3 is equal to 1 and/or R3 is in position 5 or 6 on the pyridine nucleus as is represented below:
R3 is even more preferably in position 6. Preferably, R3 represents a hydrogen atom, —NH2 or CN.
The subgroup of formula (I′) is differentiated:
in which k, R1, R′1, R2, R3 are as defined above.
The subgroup of formula (I″) is differentiated:
in which k is 0 or 1, R1 represents a (C1-C4)alkyl group, R2 represents a (C1-C6)alkyl group optionally substituted with the —NRaRb group in which Ra and Rb form, together with the nitrogen atom to which they are attached, the (C4-C6)heterocycloalkyl group optionally comprising, in the ring, the group —S(O)q with q=0, 1 or 2 or the group —NH— or —N(C1-C4)alkyl, and R3 is positioned in position 5 or 6.
The (C1-C4)alkylene group of W denotes more particularly the —(CH2)1-4-group.
The subgroup of formula (I′″) is differentiated:
in which k is 0 or 1, R1 represents a phenyl group optionally substituted with a trifluoromethyl group, R2 represents a (C1-C6)alkyl group substituted with the —NRaRb group in which Ra and Rb form, together with the nitrogen atom to which they are attached, the (C4-C6)heterocycloalkyl group optionally comprising, in the ring, the group —S(O)q with q=0, 1 or 2 or the group —NH— or —N(C1-C4)alkyl, and R3 is positioned in position 5 or 6.
Among the compounds which are subjects of the invention, mention may be made of those of Table I.
The compounds of the invention, including the exemplified compounds, can exist in the form of bases or of addition salts with acids. Such addition salts are also part of the invention. These salts are advantageously prepared with pharmaceutically acceptable acids, but the salts of other acids that are useful, for example, for purifying or isolating the compounds are also part of the invention. The compounds according to the invention may also exist in the form of hydrates or of solvates, i.e. in the form of associations or combinations with one or more molecules of water or with a solvent. Such hydrates and solvates are also part of the invention.
The compounds may comprise one or more asymmetrical carbon atoms. They may therefore exist in the form of enantiomers or of diastereoisomers. These enantiomers and diastereoisomers, and also mixtures thereof, are part of the invention.
According to the present invention, the N-oxides of the compounds comprising an amine or a nitrogen atom are also part of the invention.
According to a 2nd aspect, a subject of the invention is the process for preparing the compounds of the invention and also some of the reaction intermediates.
Preparation of the Compounds of Formula I for which W═(C1-C4)alkylene-C≡C—
These compounds can be prepared according to Scheme 1, 2 or 3.
In stage (i), Sonogashira coupling is carried out between P1 and P2 so as to obtain P3. Hal represents a halogen (chlorine, bromine, iodine) atom, ALK represents a (C1-C4)alkylene group and PG represents an amine-function-protecting group, for example BOC. The coupling is carried out in the presence of a palladium (in the oxidation state (0) or (II)) complex in a solvent in a basic medium. The palladium complex may, for example, be Pd(PPh3)4, PdCl2(PPh3)2, Pd(OAc)2, PdCl2(dppf) or bis(di-tert-butyl(4-dimethylaminophenyl)phosphine)dichloropalladium(II).
A copper (I) salt, such as cuprous chloride, is generally required as a cocatalyst of the palladium complex. However, it has recently been discovered that certain catalytic systems do not require a copper salt, for instance the system Pd2(dba)3, P(t-Bu)3 or Et3N in THF (Eur. J. Org. Chem. 2000, 3679).
It is preferable to carry out the process in a deoxygenated medium so as to preserve the catalytic system when the latter is sensitive to oxygen.
The coupling is carried out in the presence of a basic medium, which may be, for example, K2CO3, NaHCO3, Et3N, K3PO4, Ba(OH)2, NaOH, KF, CsF, Cs2CO3, etc. The coupling may be carried out in a mixture of a polar solvent, for example DMF. The temperature is between 50 and 120° C. The reaction time may in certain cases exceed be long (see conditions of Ex.1.3.).
Further details on the Sonogashira coupling (Scheme 1 of Chem. Rev.) and on the operating conditions and the palladium complexes, copper salts and bases that can be used, will be found in: Chem. Rev. 2007, 107(3), 874; Tetrahedron Lett. 2007, 48, 7129-7133; K. Sonogashira in “Metal-Catalyzed Cross-coupling Reactions”, 1998, eds.: F. Diederich, P. J. Stang, Wiley-VCH, Weinheim, ISBN 3-527-29421-X.
In stage (ii), P3 is deprotected, for example by treatment in an acidic medium when PG represents BOC. In stage (iii), P3 and P4 are reacted in the presence of an agent for introducing the “C═O” unit (for example, phosgene, triphosgene or N,N′-disuccinimidyl carbonate DSC). The reaction for introducing “C═O” is preferably carried out in the presence of a base such as, for example, triethylamine and at a temperature of between −5° C. and ambient temperature. The solvent may be THF.
According to Scheme 2, in stage (i), Sonogashira coupling is carried out between P5 and P2 so as to obtain P6, and then, in stage (ii), P6 is reacted with the amine R2NH2 so as to obtain P3. Stages (iii) and (iv) are similar to stages (ii) and (iii) of Scheme 1.
According to Scheme 3, Sonogashira coupling is carried out between P1 and P7 under the conditions described in detail above.
Preparation of the Compounds of Formula I for which W═(C1-C4)alkylene-CH2CH2—
According to Scheme 4 (which is similar to Scheme 1), P′3 and P4 are coupled in the presence of the agent for introducing the “C═O” unit. P′3 is obtained by hydrogenation of P3.
An alternative consists in hydrogenating a compound of formula (I) for which W═(C1-C4)alkylene-C≡C—.
The hydrogenation in Schemes 4 and 5 is carried out in the presence of hydrogen and of a metal catalyst, for example palladium deposited on a solid support (for example, Pd/C). The hydrogenation may be carried out, for example, at ambient temperature, with hydrogen under a pressure of the order of 1 atm in the presence of palladium-on-charcoal, for a period of the order of 20-30 min. See, for example, the conditions of Ex.3.6. Other techniques for hydrogenating —C≡C— bonds exist and are known to those skilled in the art.
Preparation of the Compounds of Formula I for which W═(C1-C4)alkylene-CH═CH—
According to Scheme 6 (which is similar to Scheme 1), P″3 and P4 are coupled in the presence of the agent for introducing the “C═O” unit. P″3 is obtained by partial hydrogenation of P3.
An alternative consists in partially hydrogenating a compound of formula (I) for which W═(C1-C4)alkylene-C≡C—.
For Schemes 6 and 7, the term “partial hydrogenation” is intended to mean the fact of not completely hydrogenating all the —C≡C— bonds of the starting product; to do this, use may, for example, be made of a deactivated or partially deactivated hydrogenation catalyst, for instance the Lindlar catalyst (it is typically Pd/CaCO3 deactivated with quinoline or lead acetate). The partial hydrogenation thus results in a mixture of the starting product and of the products comprising the double and the triple bond which can then be separated by chromatography. Depending on the type of hydrogenation, it is possible to obtain a double bond, one of the forms of which (Z or E) is favoured.
Preparation of the Compounds of Formula (I) for which Z═N, Z═CH and W=1,4-cyclohexylene
In stage (i), P8 and the acrylate P9 are reacted so as to obtain P10 (Bohlmann-Rahtz reaction; in this respect, see Bagley, Synthesis 2007, 2459). In stage (ii), the ester function of P10 is saponified and the resulting product is acidified so as to obtain the acid equivalent of P10, which subsequently reacts, in stage (iii), with the amine R2NH2 so as to obtain P11 (amidation). An acid activator such as BOP or (O-benzotriazol-1-yl)-N,N,N′,N′-tetramethyluronium tetrafluoroborate (TBTU) can be used. Stages (iv) and (v) are similar to stages (ii) and (iii) of Scheme 1.
Preparation of the Compounds of Formula (I) for which Z═N, Z═CH and W═(CH2)1-4CRR′—
In stage (i), P12 and the acrylate P9 are reacted so as to obtain P13 (Bohlmann-Rahtz reaction). In stage (ii), the ester function of P13 is saponified and the resulting product is acidified so as to obtain the acid equivalent of P13, which subsequently reacts, in stage (iii), with the amine R2NH2 so as to obtain P14 (amidation). An acid activator such as BOP or (O-benzotriazol-1-yl)-N,N,N′,N′-tetramethyluronium tetrafluoroborate (TBTU) can be used. Stages (iv) and (v) are similar to stages (ii) and (iii) of Scheme 1.
P16 is obtained starting from the acid P15 by monosubstitution with an amine of formula R1R′1 NH. In the case of an aliphatic or cycloaliphatic amine, the reaction can be carried out at ambient temperature and in a protic solvent such as an alcohol or water, or in an aprotic solvent such as THF (see also Ex.1.1.). In the case of an aniline, a strong base such as, for example, LiHMDS (((CH3)3Si)2NLi) is added and the reaction is carried out under hot conditions (see also Ex.3.3.). The monosubstitution is described on pages 14-15 of FR 2917412 in the case where Z═N and Z′═CH, but can apply to other Z/Z′
In the case where Z and Z′ both represent N, and Hal represents a chlorine atom, P16 may also be obtained starting from the commercially available compound ethyl 2,4-dichloropyrimidine-5-carboxylate:
Scheme 11 using an ester function subsequently converted to an acid function also applies to the case where Z═N and Z′═CH: see the conditions in Chem. Pharm. Bull. 2000, 48(12), 1847-1853 (reactions in Tables 1 and 2).
P1 is obtained starting from the acid in P16 by amidation using the amine R2NH2 or a salt of this amine, for example the hydrochloride. The amidation can be carried out advantageously in the presence of an acid activator (also called coupling agent), for instance benzotriazol-1-yloxytris(dimethylamino)phosphonium hexafluorophosphate (or BOP, CAS No. 56602-33-6, see also Castro, B., Dormoy, J. R. Tetrahedron Letter 1975, 16, 1219). The reaction is preferably carried out in the presence of a base (such as triethylamine) at ambient temperature, in a solvent such as tetrahydrofuran (THF) or dimethylformamide (DMF). See Ex.1.2.
P2 is obtained starting from P17 according to Scheme 12 by conversion of the alcohol function to give an amine function via the intermediate P18 carrying the mesyl leaving group, and then protection of P19 with PG. Sodium azide can also be used in place of NH3 so as to give an azide function, which is subsequently converted to give an amine function (see scheme II of Tetrahedron 1987, 43(21), 5145-58 and scheme 1 of Tetrahedron 2008, 64, 3578-3588). See prep.1.
P17 may be either commercially available (for example, 3-butyn-1-ol CAS No. 927-74-2 or 2-propyn-1-ol CAS No. 107-19-7) or prepared according to the methods known to those skilled in the art.
P4 Compounds
P4 may be commercially available or prepared according to the methods known to those skilled in the art.
Hydrogenation of the cyano compound may, for example, be used, so as to obtain P4 with n=1:
The hydrogenation conditions may be those described in Examples 19 and 20 of WO 00/46179 or in Synlett 2001, 10, 1623-1625.
The compounds 3-picolylamine (CAS No. 3731-52-0), 3-(2-aminoethyl)pyridine (CAS No. 20173-24-4), 2-amino-5-aminomethylpyridine (CAS No. 156973-09-0), 2-methyl-5-amino-methylpyridine (CAS No. 56622-54-9), 3-methyl-5-aminomethylpyridine (CAS No. 771574-45-9), 2-(BOC-amino)-5-aminomethylpyridine (CAS No. 187237-37-2) and 2,5-diaminopyridine (CAS No. 4318-76-7) are commercially available products. 2-Amino-5-aminomethylpyridine can also be prepared according to EP 0607804. 5-Aminomethyl-2-(dimethylamino)pyridine (CAS No. 354824-17-2) is commercially available or can be prepared according to Journal of Agricultural and Food Chemistry 2008, 56(1), 204-212. 2-Amino-3-methyl-5-aminomethyl-pyridine (CAS No. 187163-76-4) can be obtained by catalytic hydrogenation of the compound 6-amino-5-methylnicotinonitrile (CAS No. 183428-91-3), the amine function being doubly protected with BOC. Catalytic hydrogenation of 6-methylamino-3-pyridinecarbonitrile (CAS No. 261715-36-0) makes it possible to obtain 2-methylamino-5-aminomethylpyridine.
The preparation of 5-aminomethyl-2-(dimethylamino)pyridine (CAS No. 779324-37-7) and of 5-aminomethyl-2-(dimethylamino)pyridine (CAS No. 354824-17-2) in hydrochloride form is also described on page 106 of WO 2007/044449 (Examples 207 and 208).
P5 is obtained according to Scheme 14 starting from P16 with R1═R′1═H or else starting from P16 with R′1═H. In the 1st scenario, P16 is reacted with triphosgene so as to obtain P17. Next, P17 is reacted with a halide R1Hal in the presence of a strong base, for example NaH, in a polar solvent, for example DMF. The halide is more particularly an iodide (for example, ethyl iodide). In the 2nd scenario, the triphosgene is reacted with P16 where R′1═H. The reaction with triphosgene can be carried out in dioxane at reflux for a long period of time (see Ex.2.1.).
P7 can be obtained by coupling between P4 and P19 in the presence of an agent for introducing the “C═O” unit. Another pathway for obtaining said compound is described in Scheme 15 and consists in reacting the acyl azide P20 with the amine P4 according to a Curtius rearrangement. The reaction conditions are illustrated by those of Ex.3.2.
P8 is obtained by reacting the Weinberg amide P22 with an ethynyl magnesium halide HC≡CMgHal, for example the bromide. P22 can be obtained starting from P21 and from O,N-dimethylhydroxylamine according to the conditions described in detail in Synth. Comm. 2003, 33(23), 4013-4018 or in Synth. Comm. 2001, 31(13), 2011-2019 or else in the presence of an acid activator such as BOP, as described in detail in Ex.5.1. 4-Aminocyclohexanecarboxylic acid (cis or trans) is a commercially available product. PG represents more particularly BOC.
The acrylate P9 is either commercially available or it can be obtained as indicated on page 945 of Helv. Chim. Acta 1973, 56(3), 944-958. The preparation of P9 starting from imino ethers (the synthesis of which is itself described in JACS 1945, 67, 1017) is also described on page 8 of DE 2406198 or on page 11 of DE 2239815.
P12 is obtained by reacting an ethynyl magnesium halide HC≡CMgHal, for example the bromide, with P24. P24 corresponds to compound P23 which is protected on the NH function with a PG protective group such as BOC. P23 may be a commercially available product, for instance 3,3-dimethyl-2-pyrrolidinone (CAS No. 4831-43-0), 3,3-dimethylpiperidinone (CAS No. 23789-83-5) or 5-azaspiro[2.4]heptan-4-one (CAS No. 3697-70-9). A method for obtaining P23 with (CH2)3 is described in scheme 1 of J. Med. Chem. 1997, 40, 44-49. A method for obtaining P23 with (CH2)2 is described in scheme 1 of J. Med. Chem. 1996, 39(9), 1898-1906. See also U.S. Pat. No. 5,776,959.
The R2NH2 amines are commercially available products or products already described in published documents:
A method for obtaining the compounds for which R2 represents a (C1-C6)alkyl group substituted with the —NRaRb group in which Ra and Rb form, together with the nitrogen atom to which they are attached, the (C4-C6)heterocycloalkyl group optionally comprising, in the ring, the group —S(O)q with q=0, 1 or 2 or the group —NH— or —N(C1-C4)alkyl, is described in Scheme 18 and is based on scheme 3 of Bioorg. Med. Chem. 2007, 15, 365-373 or on scheme 2 of Bioorg. Med. Chem. Lett. 2008, 18, 1378-1381:
Another method described in Scheme 19 is based on FIG. 2 of Bioorg. Med. Chem. Lett. 2006, 16, 1938-1940:
It may be necessary to use, in at least one of the stages, a protective group (PG) in order to protect one or more chemical function(s), in particular a primary or secondary amine function. For example, when Ra and Rb both represent a hydrogen atom, the amidation in Schemes 8, 9 or 10 is carried out using, for R2NH2, the compound 2HN—(C1-C6)alkyl-NH-PG, where PG advantageously represents BOC (tert-butoxycarbonyl). Likewise, when the heterocycloalkyl group formed by Ra and Rb represents the piperazinyl group
the —NH— function thereof can be advantageously protected using the following compound
where PG advantageously represents BOC. Likewise, when R3 represents the —NH2 or —NHRc group, the amine function can be advantageously protected with one or two PG group(s), preferably BOC. Use may, for example, be made of the following compound P:
The chemical function(s) is (are) subsequently obtained by means of a (final or intermediate) deprotection stage, the conditions of which depend on the nature of the function(s) protected and on the protective group used. Reference may be made to “Protective groups in Organic Synthesis” by T. Greene, Wiley, 4th ed., ISBN=978-0-471-69754-1, in particular to chapter 7 as regards amine-function-protecting groups. In the case of the protection of —NH2 or —NH— functions with BOC, the deprotection stage is carried out in an acidic medium using, for example, HCl or trifluoroacetic acid. The associated salt (hydrochloride or trifluoroacetate) is thus, where appropriate, obtained.
The salts are obtained during the deprotection stage described above or else by bringing the acid into contact with the compound in its base form.
In the above schemes, the starting compounds and the reactants, when the method for preparing them is not described, are commercially available or described in the literature, or else can be prepared according to methods which are described therein and which are known to those skilled in the art. Those skilled in the art may also use as a basis the operating conditions given in the examples which are described hereinafter.
The N-oxides of the compounds comprising an amine or a nitrogen atom are prepared according to the methods known to those skilled in the art, by reacting the amine with organic peracids such as peracetic acids, trifluoroperacetic acids, performic acids, perbenzoic acids or its derivatives such as 3-chloroperbenzoic acid, at temperatures of between 0° C. and 90° C., preferably at temperatures below 50° C.
According to a 3rd aspect, the invention concerns a pharmaceutical composition comprising a compound as defined above, in combination with a pharmaceutically acceptable excipient. The excipient is chosen from the usual excipients known to those skilled in the art, according to the pharmaceutical form and the method of administration desired. The method of administration may, for example, be oral or intravenous administration.
According to a 4th aspect, a subject of the invention is a medicament which comprises a compound as defined above, and also the use of a compound as defined above, for the manufacture of a medicament. It may be useful for treating a pathological condition, in particular cancer. The medicament (and also a compound according to the invention) may be administered in combination with one (or more) anticancer agent(s). This treatment may be administered simultaneously, separately or else sequentially. The treatment will be adapted by the practitioner according to the disease and the tumour to be treated.
According to a 5th aspect, the invention also concerns a method for treating the pathologies indicated above, which comprises the administration, to a patient, of an effective dose of a compound according to the invention or a pharmaceutically acceptable salt or hydrate or solvate thereof.
The following examples illustrate the preparation of some compounds in accordance with the invention. The numbers of the compounds exemplified refer back to those given in the table hereinafter, which illustrates the chemical structures and the physical properties of some compounds according to the invention.
The compounds were analyzed by HPLC-UV-MS coupling (liquid chromatography, ultraviolet (UV) detection and mass detection). The apparatus used is composed of an Agilent chromatography system equipped with an Agilent diode array detector and with a Waters ZQ single quadripole mass spectrometer or a Waters Quattro-Micro triple quadripole mass spectrometer.
The liquid chromatography/mass spectrometry (LC/MS) spectra were recorded in positive electrospray (ESI) mode, in order to observe the ions resulting from the protonation of compounds analyzed (MH+) or from the formation of adducts with other cations, such as Na+, K+, etc. The ionization parameters are as follows: cone voltage: 20 V; capillary voltage: 3 kV; source temperature: 120° C.; desolvation temperature: 450° C.; desolvation gas: N2 at 450 l/h.
The HPLC conditions are chosen from one of the following methods:
10:90 (10
5:95 (2.3
10:90 (10 min)
10:90 (15 min)
5:95 (2.9 min)
100:0 or
10:90 (15 min)
100:0 (16
100:0
100:0 or 99:1 (3.5
100:0 (20 min)
The 1H NMR spectra are recorded on a Bruker Avance 250/Bruker Avance 400 or Bruker Avance II 500 spectrometer. The central peak of DMSO-d6 (2.50 ppm) is used as an internal reference. The following abbreviations are used: s: singlet; d: doublet; dd: double of doublets; t: triplet; q: quadruplet; m: unresolved peak/multiplet; br.s: broad signal.
In a round-bottomed flask, 10 ml (132.12 mmol) of but-3-yn-1-ol and 28 ml (201.16 mmol) of triethylamine are diluted in 500 ml of CH2Cl2 (DCM), the mixture is cooled to 0° C. and then 11.3 ml (145.4 mM) of methanesulphonyl chloride are added. The mixture is stirred for 4 h while keeping the temperature at 0° C. The organic phase is washed with water, a 1N solution of HCl, a saturated solution of Na2HCO3, and then a saturated solution of NaCl. The resulting product is dried over Na2SO4, filtered and evaporated. 19.15 g (yield=97%) of a translucent oil are obtained.
In a round-bottomed flask, 20 g (134.97 mM) of methanesulphonic acid but-3-ynyl ester are diluted in 100 ml of EtOH. 200 ml (3344.49 mM) of an aqueous solution of ammonia at 32% are added. The mixture is heated at 50° C. for 3 h. The mixture is brought back to ambient temperature (AT) and then 32.4 g (148.47 mM) of Boc2O dissolved beforehand in 250 ml of acetonitrile are added. The mixture is stirred for 72 h at AT. The mixture is filtered and then the filtrate is evaporated. The residue is taken up in DCM, the organic phase is washed with a saturated solution of NaCl, the resulting product is separated by settling out, and the organic phase is dried over Na2SO4. The solvents are evaporated to dryness. The resulting product is purified by flash chromatography with 100% DCM. 17.2 g (yield=55.2%) of a translucent oil are obtained.
3.24 g (30 mM) of pyridin-3-ylmethylamine are dissolved in 100 ml of DCM; 7.20 g (33 mM) of BOC2O and 4.59 ml (33 mM) of triethylamine are added. The mixture is stirred at ambient temperature for 3 h. The solvents are evaporated off and the residue is taken up with DCM. The resulting product is washed with water and then a saturated solution of NaCl. The resulting product is dried over sodium sulphate, and filtered, and then the filtrate is evaporated off. The residue is purified by flash chromatography (99/1 DCM/CH3OH-95/5 DCM/CH3OH). 5.64 g (90%) are obtained.
LCMS (NEUTRAL) MH+=209; tr=5.99.
5.64 g (27.08 mM) of pyridin-3-ylmethylcarbamic acid tert-butyl ester are dissolved in 40 ml of methanol; 4.55 g (54.1 mM) of sodium bicarbonate and then 50 ml of water are added, and 12.24 g (19.9 mM) of potassium peroxymonosulphate, solubilized beforehand in 50 ml of water, are added dropwise. The mixture is stirred at ambient temperature for 18 h. It is diluted with 100 ml of DCM, filtered and separated by settling out. The aqueous phase is extracted with DCM, and washing is carried out with a saturated solution of NaCl. The resulting product is dried over sodium sulphate and filtered, and then the filtrate is evaporated off. 5.74 g (95%) are obtained.
LCMS (NEUTRAL) MH+=225; tr=5.72.
5 ml (20 mM) of 4M HCl in dioxane are cooled to 0° C. 1.49 g (6.64 mM) of (1-oxypyridin-3-ylmethyl)carbamic acid tert-butyl ester are added. The mixture is brought back to AT and then stirred for 2 h. 10 ml (20 mM) of 4M HCl in dioxane are added and the mixture is stirred for a further 2 h. The resulting product is evaporated to dryness. 1.3 g (100%) are obtained.
LCMS (NEUTRAL) MH+=125.
In a round-bottomed flask, 26.1 g (0.136 M) of 2,6-dichloronicotinic acid are mixed with 180 ml of an aqueous solution of ethylamine at 70%. The mixture is stirred at AT for 5 d. The mixture is evaporated under reduced pressure (RP). The residue is taken up with 100 ml of water. The resulting product is cooled using an ice bath and acidified to pH 3 with a 5N HCl solution. The precipitate is filtered off, washed with cold water and vacuum-dried over P2O5 at 60° C. 24.93 g (91.4%) of a white solid are obtained. Mp=157-159° C.
In a round-bottomed flask, 5.0 g (24.92 mM) of 6-chloro-2-ethylaminonicotinic acid are dissolved in 300 ml of THF. 10.41 ml (74.77 mM) of triethylamine are added, followed by 14.95 ml (29.91 mM) of a 2N solution of methylamine in THF and subsequently 13.22 g (29.91 mM) of BOP. The mixture is stirred at AT for 15 h. The solvent is evaporated off and the residue is taken up with ethyl acetate. The organic phase is washed with water and then a saturated solution of NaCl. The resulting product is dried over Na2SO4, filtered and evaporated. The residue is purified by flash chromatography (gradient DCM-MeOH 1 to 10%). 4.1 g are obtained (yield: 77%) (LCMS (TFA3) tr=1.19 min).
2.9 g (3 mM) of 6-chloro-2-methylaminonicotinamide are dissolved in 20 ml of DMF. 2.29 g (13.57 mM) of tert-butyl but-3-yn-1-ylcarbamate and 6.61 ml (47.50 mmol) of triethylamine are added. The mixture is degassed with argon for 30 min and then 0.47 g (0.68 mM) of dichlorobis(triphenylphosphine)palladium(II) and 0.13 g (0.068 mM) of CuI are added. The mixture is stirred while heating at 90° C. for 12 h. The mixture is evaporated and the residue is taken up with DCM; the resulting product is washed with water and dried over sodium sulphate; the resulting product is filtered and evaporated. The residue is purified by flash chromatography with 100 DCM/90-10 DCM-MeOH. 2.5 g are obtained (yield=45%) (LCMS (TFA3): tr=2.15).
2.5 g (7.22 mM) of [4-(6-ethylamino-5-methylcarbamoylpyridin-2-yl)but-3-ynyl]carbamic acid tert-butyl ester are dissolved in 30 ml of DCM. The mixture is cooled using an ice bath and 11.12 ml of TFA are added. The mixture is stirred at AT for 15 h. The solvent is evaporated off. The residue is purified by flash chromatography with 100 DCM/80-20 DCM-MeOH. 0.8 g is obtained (yield=45%) (LCMS (TFA3): tr=1.62 min).
0.8 g (3.25 mM) of 6-(4-aminobut-1-ynyl)-2-ethylamino-N-methylnicotinamide is dissolved in 50 ml of ethanol and the mixture is hydrogenated at AT and under normal pressure in the presence of 0.07 g (0.06 mM) of Pd/C at 10%. The resulting product is filtered through Whatman paper and the filtrate is evaporated off. 0.76 g is obtained (yield=93.8%) (LCMS (TFA3): tr=1.52 min)
0.3 g (1.20 mM) of 6-(4-aminobutyl)-2-ethylamino-N-methylnicotinamide is dissolved in 30 ml of THF; 0.50 ml (3.6 mM) of triethylamine, 0.175 g (1.44 mM) of DMAP and 0.368 g (1.44 mM) of DSC are successively added. The mixture is stirred at AT for 4 h. 0.465 g (1.44 mM) of di-tert-butyl[5-(aminomethyl)pyridin-2-yl]imidodicarbonate is subsequently added and the mixture is stirred at AT for 12 h. The solvents are evaporated off and the residue is taken up with DCM; the resulting product is washed with water and brine. The resulting product is separated by settling out and the organic phase is dried over Na2SO4. Purification is carried out by flash chromatography with 99-1/80-20 DCM-MeOH. The residue is dissolved in 20 ml of DCM; the resulting product is cooled using an ice bath and 30 eq of TFA are added. The mixture is stirred at AT for 12 h. The mixture is evaporated and the residue is taken up with a 10% Na2CO3 solution. The precipitate is filtered off and washed with water. The resulting product is vacuum-dried over P2O5 at 60° C. 0.33 g of the product is obtained (yield=70%). LCMS (TFA3) tr=0.53 min; 1H NMR (250 MHz, DMSO-d6) 1.14 (t, 3H), 1.27-1.49 (m, 2H), 1.52-1.75 (m, 2H), 2.51-2.60 (m, 2H), 2.72 (d, 3H), 3.01 (q, 2H), 3.34-3.48 (m, 2H), 3.97 (d, 2H), 5.75 (s, 2H), 5.83 (t, 1H), 6.05 (t, 1H), 6.39 (d, 2H), 7.26 (dd, 1H), 7.70-7.85 (m, 2H), 8.20-8.41 (m, 2H).
2 g (10 mM) of 6-chloro-2-(ethylamino)nicotinic acid are dissolved in 25 ml of dioxane and then 1.48 g (5 mM) of triphosgene are added. The mixture is brought to reflux for 48 h. After a return to ambient temperature (AT), the mixture is filtered and the precipitate is washed with water and vacuum-dried over P2O5. 1.70 g are obtained. Yield=75.2%.
0.680 g (3 mM) of the compound obtained in stage 1 is dissolved in 20 ml of DMF. 1.05 g (6 mM) of tert-butyl but-3-yn-1-ylcarbamate and 3 ml of triethylamine are added. The mixture is degassed with argon for 30 min, and then 0.105 g (0.15 mM) of dichlorobis(triphenylphosphine)palladium(II) and 0.04 g (0.21 mM) of CuI are added. The mixture is stirred at AT for 16 h. 1.07 g (6 mM) of 2-(1,1-dioxidothiomorpholin-4-yl)ethanamine in 3 ml of DMF are added and the mixture is stirred at AT for 3 h. The mixture is evaporated and the residue is taken up with DCM; the resulting product is washed with water and dried over sodium sulphate; the resulting product is filtered and evaporated. The residue is purified by flash chromatography with 100 DCM/95-5 DCM-MeOH. 0.91 g is obtained (yield=61%) LCMS (TFA3): tr=2.06 min.
0.9 g (1.82 mM) of compound obtained in stage 2.2 is dissolved in 40 ml of ethanol and the mixture is hydrogenated at AT and under normal pressure in the presence of 0.04 g of Pd/C at 10%. The resulting product is filtered through Whatman paper and the filtrate is evaporated off. Purification is carried out by flash chromatography with 100 DCM/95-5 DCM-MeOH. 0.77 g is obtained (yield=85%) (LCMS (TFA3): tr=1.95 min).
0.754 g (1.52 mM) of compound obtained in stage 2.3 is dissolved in 30 ml of DCM. The mixture is cooled using an ice bath and 2.57 ml of TFA are added. The mixture is stirred at AT for 18 h. The resulting product is evaporated; the residue is taken up with Et2O and the resulting product is again evaporated. 0.945 g is obtained (yield=99.7%) (LCMS (TFA3): tr=1.56 min).
0.944 g (1.51 mM) of compound obtained in stage 2.4 is dissolved in 50 ml of THF; 0.84 ml (6.04 mM) of triethylamine, 0.277 g (2.26 mM) of DMAP and 0.582 g (2.26 mM) of DSC are successively added. The mixture is stirred at AT for 2 h. 25 ml of DMF and 0.405 g (1.81 mM) of tert-butyl[5-(aminomethyl)pyridin-2-yl]carbamate are subsequently added and the mixture is stirred at AT for 18 h. The solvents are evaporated off and the residue is taken up with DCM; the resulting product is washed with water and an insoluble material is filtered off. The resulting product is separated by settling out and the organic phase is dried over Na2SO4. Purification is carried out by flash chromatography with 95-5/90-10 DCM-MeOH. 0.54 g is obtained (yield=55.2%) (LCMS (TFA3): tr=1.87 min).
0.513 g of compound obtained in stage 5 is dissolved in 20 ml of DCM; the mixture is cooled using an ice bath and 1.34 ml (17.45 mM) of TFA are added. The mixture is stirred at AT for 18 h. The mixture is evaporated and the residue taken up with a 10% Na2CO3 solution. The precipitate is filtered off and washed with water. The resulting product is vacuum-dried over P2O5 at 60° C. 0.37 g is obtained (yield=85.2%); LCMS (TFA3) tr=0.53 min; 1H NMR (250 MHz, DMSO-d6) 1.14 (t, 3H), 1.30-1.49 (m, 2H), 1.52-1.78 (m, 2H), 2.56 (t, 2H), 2.64 (t, 2H), 2.88-3.17 (m, 10H), 3.22-3.50 (m, 4H), 3.98 (d, 2H), 5.76 (s, 2H), 5.82 (t, 1H), 6.05 (t, 1H), 6.34-6.46 (m, 2H), 7.27 (dd, 1H), 7.73-7.89 (m, 2H), 8.19-8.37 (m, 2H).
10 g (101.94 mM) of 4-pentynoic acid are dissolved in 100 ml of DCM, and 0.4 ml (5.2 mM) of DMF is added, followed by 11 ml (126.1 mM) of oxalyl chloride, dropwise. The mixture is stirred at AT for 2 h. The mixture is evaporated to dryness and then distilled under RP (water-jet pump) (40±2° C.). 10.4 g of a translucent oil are obtained (yield=87%).
9.1 g (78.77 mM) of 4-pentynoic acid chloride are diluted in 130 ml of acetonitrile. 5.6 g (86.64 mM) of NaN3 are added and then the mixture is heated at 70° C. for 2 h. 9.3 g (86.64 mM) of 3-(aminomethyl)pyridine, solubilized beforehand in 15 ml of acetonitrile, are added and then the mixture is heated at 70° C. for 3 h. The solvents are evaporated off, the residue is taken up in DCM, and the resulting product is washed successively with H2O and brine. The resulting product is dried over Na2SO4, filtered and evaporated. The residue is purified by flash chromatography with 100% DCM to 90/10 DCM/MeOH. 7.11 g of a white powder are obtained (yield=44%). LCMS (TFA15): tr=4.1 min.
1.52 g (16.4 mM) of aniline are dissolved in 25 ml of THF, and 25 ml (25 mM) of a 1N solution of LiHMDS in THF are added dropwise. The reaction medium is stirred at 75° C. for 1 h. 1.5 g (7.8 mM) of dichloronicotinic acid dissolved beforehand in 25 ml of THF are added dropwise. The mixture is stirred at AT for 15 h. The mixture is diluted with water and then acidified to pH=2 with 5N HCl. The mixture is extracted with ethyl acetate, and the organic phase is washed successively with H2O and brine. The organic phase is dried with Na2SO4, filtered, and then evaporated to dryness. The residue is purified by flash chromatography with 99/1 DCM/MeOH to 90/10 DCM/MeOH. 1.17 g of a white solid are obtained (yield=61 mol %). (LCMS (TFA15): tr=9.5 min).
In a round-bottomed flask, 0.5 g (2.01 mM) of 6-chloro-2-phenylaminonicotinic acid is dissolved in 20 ml of THF. 0.84 ml (6.03 mM) of triethylamine is added, followed by 2.01 ml (4.02 mM) of a 2N solution of methylamine in THF and subsequently 0.89 g (2.01 mM) of BOP. The mixture is stirred at AT for 15 h. The solvent is evaporated off and the residue is taken up with ethyl acetate. The organic phase is washed with water and then a saturated solution of NaCl. It is dried over Na2SO4, filtered and evaporated. The residue is purified by flash chromatography (100% DCM isocratic gradient). 0.5 g of a white solid is obtained (yield: 96%) (LCMS (TFA15): tr=9.27 min).
0.5 g (1.91 mM) of 6-chloro-2-phenylamino-N-methylnicotinamide is dissolved in 15 ml of DMF. 0.38 g (1.91 mM) of 1-but-3-ynyl-3-pyridin-3-ylmethylurea and 0.93 ml (6.69 mM) of triethylamine are added. The mixture is degassed with argon for 30 min and then 0.06 g (0.10 mM) of dichlorobis(triphenylphosphine)palladium(II) and 0.02 g (0.10 mM) of CuI are added. The mixture is stirred while heating at 90° C. for 12 h. The resulting product is evaporated and the residue is taken up with DCM; the resulting product is washed with water and dried over sodium sulphate; the resulting product is filtered and evaporated. The residue is purified by flash chromatography with 100 DCM/90-10 DCM-MeOH. 0.4 g is obtained (yield=49%) LCMS (TFA15): tr=5.96 min; 1H NMR (400 MHz, DMSO-d6) 2.60 (t, 2H), 2.81 (d, 3H), 3.23-3.31 (m, 2H), 4.24 (d, 2H), 6.26 (t, 1H), 6.60 (t, 1H), 6.94 (d, 1H), 6.98 (t, 1H), 7.27-7.38 (m, 3H), 7.59-7.71 (m, 3H), 8.03 (d, 1H), 8.46 (br. s., 2H), 8.66-8.83 (m, 1 H), 11.03 (s, 1H).
0.27 g (0.63 mM) of N-methyl-2-phenylamino-6-[4-(3-pyridin-3-ylmethylureido)but-1-ynyl]nicotinamide is dissolved in 30 ml of ethanol and the mixture is hydrogenated at AT under normal pressure in the presence of 0.013 g (0.01 mM) of Pd/C at 10%. The resulting product is filtered through Whatman paper and the filtrate is evaporated off. The compound is recrystallized from a minimum amount of ethyl acetate, and the resulting product is filtered and dried. 0.15 g of a white powder is obtained (yield=57%). LCMS (TFA15) tr=5.82 min; 1H NMR (250 MHz, DMSO-d6) 1.38 (qd, 2H), 1.51-1.82 (m, 2H), 2.63 (t, 2H), 2.75 (d, 3 H), 3.00 (q, 2H), 4.16 (d, 2H), 5.96 (t, 1H), 6.31 (t, 1H), 6.66 (d, 1H), 6.89 (t, 1H), 7.17-7.36 (m, 3H), 7.61 (d, 1H), 7.69 (d, 2H), 7.95 (d, 1H), 8.42 (d, 2H), 8.60 (d, 1H), 11.04 (s, 1H).
15.3 ml of diisopropylamine are added, at −70° C., to a solution of 44 ml of 2.5 M nBuLi in hexane. The medium is heated at −10° C. for 5 min and then cooled to −70° C., and 10 g of tert-butyl 2-oxopyrrolidine-1-carboxylate are added dropwise in solution in 100 ml of THF. The medium is stirred at −70° C. for 1 h 30. 14 ml of methyl iodide are added and the mixture is stirred for 2 h at −70° C. The medium is allowed to come back up to −50° C., and a white solid precipitates. 830 mg of tBuOK are added and the medium is left to come back up to AT overnight. The medium is hydrolyzed, extracted in EtOAc, and the organic phases are washed with water and with brine, dried over MgSO4, and then evaporated to give 11 g of a brown oil, which is a mixture of the monoalkyl compound and the dialkyl compound. 8 ml of diisopropylamine are added, at −70° C., to the solution of 22 ml of 2.5 M BuLi in hexane. The medium is heated at −10° C. for 5 min and then cooled to −70° C., and the crude product from the preceding stage, in solution in 100 ml of THF, is added. The medium is stirred at −70° C. for 1 h 30. 7 ml of methyl iodide are added and the mixture is stirred for 2 h at −70° C. The medium is allowed to come back up to AT overnight. The medium is hydrolyzed, extracted in EtOAc, and the organic phases are washed with water and with brine, dried over MgSO4, and then evaporated to give 10 g of a brown oil. The crude product is chromatographed on silica, eluent: gradient: cyclohexane to 50/50 cyclohexane/EtOAc, so as to give 7 g of the expected product.
900 mg of the compound obtained in the preceding stage are dissolved in 10 ml of THF. After cooling to −70° C., 25 ml of ethynyl magnesium bromide in solution at 0.5 M in THF are added dropwise. The medium is stirred at −45° C. for 30 min and then the temperature is allowed to come back up to 18° C. The medium is hydrolyzed, extracted in EtOAc, and the organic phases are washed with water and with brine, dried over MgSO4, and then evaporated to give 974 mg of a yellow oil.
840 mg of ethyl 3-amino-3-(phenylamino)acrylate are added to a solution of 0.974 g of the compound obtained in the preceding stage, in 30 ml of ethanol. The mixture is refluxed for 3 days. After returning to AT, the medium is filtered. The filtrate is evaporated to give 1.65 g of the expected product.
9.6 ml of a 4M solution of HCl in dioxane are added to a solution of 1.65 g of the compound obtained in the preceding stage, in 5 ml of DCM. After stirring at AT for 12 h, the medium is concentrated and then taken up in DCM. The organic phase is washed with a saturated solution of NaHCO3 and then with brine, and dried over MgSO4, and then evaporated. 1.25 g of the expected product are obtained.
A solution of 1.07 g of the compound obtained in the preceding stage, in 25 ml of THF, are added, dropwise, to a solution of 500 mg of DMAP, 0.54 ml of triethylamine and 1 g of DSC in 20 ml of THF. After stirring at AT for 5 min, 1.27 g of bis-tert-butyl 5-(aminomethyl)pyridin-2-ylcarbamate are added. After 12 h at AT, the medium is concentrated and then taken up in DCM. The organic phase is washed with a saturated solution of NaHCO3 then with brine, then dried over MgSO4, and then evaporated. 3.89 g of a crude product are obtained, which product is purified by silica gel chromatography to give 2 g of the desired compound.
2 ml of 5M NaOH are added to a solution of 2 g of the compound obtained in the preceding stage in 10 ml of ethanol. The medium is stirred at AT for 12 h and then concentrated and taken up in a mixture of water and ethyl ether. After separation by settling out, the aqueous phase is acidified to pH=4 with 1N HCl, and then extracted in DCM. The combined organic phases are dried over MgSO4 and then evaporated so as to give 1 g of the expected product (a Boc group having been cleaved).
1 g of the compound obtained in the preceding stage is mixed with 123 mg of methylamine hydrochloride, 172 mg of HOBt, 0.95 ml of DIPEA and 1.17 g of TBTU in 5 ml of DCM. The medium is stirred at AT for 2 h. The medium is hydrolyzed, diluted in DCM, washed with water and with brine, then dried over MgSO4 and then evaporated so as to give 0.9 g of a brown oil. The crude product is chromatographed on silica gel (gradient: DCM to 95/5 DCM/MeOH) so as to give 284 mg of the expected compound.
284 mg of the compound obtained in the preceding stage are dissolved in 0.5 ml of DCM, and 1 ml of TFA is added. The medium is stirred at AT for 2 h. Water and then a saturated solution of NaHCO3 are added and the mixture is extracted in DCM. The organic phases are washed with water and with brine and then dried over MgSO4 and evaporated. The crude product is purified by silica chromatography so as to give 146 mg of a white powder. Mp=134° C.; 1H NMR (400 MHz, DMSO-d6) 1.31 (s, 6H), 1.75-1.86 (m, 2H), 2.77-2.88 (m, 5 H), 3.94 (d, 2H), 5.68 (t, 1H), 5.74 (s, 2H), 6.01 (t, 1H), 6.36 (d, 1H), 6.87 (d, 1H), 6.94 (t, 1 H), 7.23 (dd, 1H), 7.30 (t, 2H), 7.72 (d, 2H), 7.75 (d, 1H), 8.03 (d, 1H), 8.66 (q, 1H), 11.05 (s, 1H).
3 g of (1s,4s)-4-(tert-butoxycarbonylamino)cyclohexanecarboxylic acid are mixed with 1.22 g of O,N-dimethylhydroxylamine hydrochloride, 5.2 ml of triethylamine and 5.54 g of BOP in 125 ml of THF. The medium is stirred at AT for 2 days. The medium is filtered and then concentrated. The crude product is chromatographed on silica gel (gradient: DCM to 98/2 DCM/MeOH) so as to give 2.33 g of the expected compound. MH+=309 at tr=2.3 min.
At 0° C., 49 ml of a 0.5 M solution of ethynyl magnesium bromide are added to a solution of 2.33 g of the compound obtained in the preceding stage, in 10 ml of THF. The medium is stirred at 0° C. for 4 h and then diluted in ethyl ether. The medium is run into ice-cold water and then separated by settling out. The aqueous phase is extracted twice in ether. The combined organic phases are dried over MgSO4 and then evaporated so as to give 1.86 g of the expected compound.
1.51 g of ethyl 3-amino-3-(phenylamino)acrylate are added to a solution of 1.85 g of the compound obtained in the preceding stage, in 150 ml of ethanol. The mixture is refluxed for 24 h. After a return to AT, the medium is concentrated so as to give 3.07 g of a brown oil.
4.9 ml of 5M NaOH are added to a solution of 3.07 g of the compound obtained in the preceding stage, in 23 ml of ethanol. The medium is stirred at AT for 2 h and then concentrated and taken up in a mixture of water and ethyl ether. After separation by settling out, the aqueous phase is acidified to pH=5 with 6M HCl, and then extracted in DCM. The combined organic phases are dried over MgSO4 and then evaporated so as to give 2.11 g of the expected compound.
2.11 g of the compound obtained in the preceding stage are mixed with 0.66 g of 1-(2-aminoethyl)piperidine, 1.4 ml of triethylamine and 2.26 g of BOP in 51 ml of THF. The medium is stirred at AT for 24 h. The medium is hydrolyzed, diluted in DCM, washed with water, with a 10% Na2CO3 solution and with brine, then dried over MgSO4 and then evaporated so as to give 3.14 g of a gum.
12.5 ml of a 4M solution of HCl in dioxane are added to a solution of 2.68 g of the compound obtained in the preceding stage, in 9 ml of dichloromethane. After stirring for 4 hours at AT, the medium is concentrated and then taken up in DCM. The organic phase is washed with a saturated solution of Na2CO3 and then with brine, then dried over MgSO4 and then evaporated. 2.35 g of a mixture of the expected compound and of residual HMPA (by-product of BOP) originating from the preceding stage are obtained.
A solution of 1.19 g of the compound obtained in the preceding stage, in 40 ml of THF, is added, dropwise, to a solution of 430 mg of DMAP, and 0.86 g of DSC in 10 ml of THF. After stirring at AT for 15 min, 1.27 g of bis-tert-butyl 5-(aminomethyl)pyridin-2-ylcarbamate and 0.94 ml of triethylamine are added. After 3 h at AT, the medium is concentrated and then taken up in DCM. The organic phase is washed with a saturated solution of NaHCO3 and then with brine, then dried over MgSO4 and then evaporated. 2.09 g of a crude product are obtained, which product is purified by chromatography on silica gel (gradient: DCM to 9/1 DCM/MeOH) so as to give 0.18 g of the expected compound.
180 mg of the compound obtained in the preceding stage are solubilized in 0.35 ml of DCM and 0.35 ml of TFA is added. The medium is stirred at AT for 12 h and then concentrated. The crude product is triturated from a 10% solution of NaHCO3, and the gum obtained is taken up in a 1/1 CHCl3/MeOH mixture and the resulting product is evaporated. This crude product is purified by silica chromatography (gradient: DCM to DCM/MeOH/NH4OH 80/20/1) to give and then taken up in acetone, filtered and evaporated so as to give 40 mg of a white powder: Mp=112° C.; 1H NMR (250 MHz, DMSO-d6) 1.33-2.02 (m, 14H), 2.60-2.81 (m, 1 H), 3.17-3.42 (m, 6H), 3.64 (q, 2H), 3.72-3.86 (m, 1H), 4.05 (d, 2H), 6.13 (d, 1H), 6.20 (t, 1H), 6.67 (d, 1H), 6.72-6.89 (m, 3H), 6.95 (t, 1H), 7.30 (t, 2H), 7.56 (dd, 1H), 7.74 (d, 2H), 7.80 (d, 1H), 8.07 (d, 1H), 8.90 (t, 1H), 10.93 (s, 1H).
This compound is prepared according to the procedure described in Example 1.6. starting from the compound of preparation 2 and the compound of Example 1.5.
The δ chemical shifts are given in ppm.
The compounds described in Table II were subjected to pharmacological tests for determining the anticancer activity. They were tested in vitro on the following tumour lines: HCT116 (ATCC-CCL247) and PC3 (ATCC-CRL 1435). The proliferation and the cell viability were determined in a test using 3-(4,5-dimethylthiazol-2-yl)-5-(3-carboxymethoxyphenyl)-2-(4-sulphophenyl)-2H-tetrazolium (MTS) according to Fujishita T. et al., Oncology 2003, 64(4), 399-406. In this test, the mitochondrial capacity of the living cells for converting MTS into a coloured compound after incubation of the tested compound for 72 hours is measured. IC50 denotes the concentration of compound which results in a 50% loss of proliferation and of cell viability.
For the compounds of Table I, an IC50<1000 nM (1 μM) was found on the HCT116 and PC3 lines.
| Number | Date | Country | Kind |
|---|---|---|---|
| 09/01366 | Mar 2009 | FR | national |
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/FR2010/050512 | 3/22/2010 | WO | 00 | 12/1/2011 |
