Patent Application
20100222319
The present invention relates to nicotinamide derivatives, to the compositions comprising them and to their therapeutic application, in particular as anticancers. The invention also relates to the process for the preparation of these compounds and to some of the intermediates.
United States application US 2006/0216288 describes anticancer compounds of general formula:
in which the substituent R2 can in particular be a hydrogen atom, a hydroxyl or amino group, an alkyl or alkynyl group or an optionally substituted phenyl group.
International application WO 2006/028958 describes anticancer compounds of general formula:
in which A denotes a carbocycle or heterocycle.
United States application US 2004/0067985 describes antiangiogenesis compounds of general formula:
in which R2 can in particular be an aryl or alkyl group.
International application WO 03/068747 describes compounds which are inhibitors of enzyme P38 of general formula:
International application WO 2005/003099 describes compounds of general formula:
in which A can represent a phenyl group which comprises the —NR1R2 group.
International application WO 2007/031829 describes compounds of general formula:
The specific group
of the compounds of the invention is neither described nor suggested in any of these patent applications.
International application WO 2005/051366 describes anticancer compounds of general formula:
in which Z represents a phenyl or indanyl group and not a pyridinyl group.
International application WO 97/48397 describes anticancer compounds of general formula:
in which E represents a heterocycle comprising a nitrogen atom and optionally an oxygen atom.
International application WO 2007/016538 describes compounds of general formula:
in which Q can represent an R13—NR12—C(═O)— group, it being possible for R13 to be a 2-, 3- or 4-pyridinyl group, R4 and R5 representing a hydrogen atom, an alkyl, alkoxy, —OH, —CF3 or —CN group. These compounds are used in the treatment of obesity.
International application WO 00/35864 describes compounds of general formula:
in which A and B can each be a 1,3- or 1,4-para-phenylene or 2,4- or 2,5-thienylene group, V represents an alkylene or NR2CO or NR2SO2 group, and U represents an alkylene group or a single bond. The ring A can be substituted, more particularly by alkoxy groups or by a halogen atom. These compounds all comprise the —CHR2COOR1 unit, which the compounds of the invention do not comprise. Furthermore, the compounds of the invention are characterized by the presence on the ZZ′ ring of the substituents A and COR2, which is not described in WO 00/35864.
In the context of the present invention, and unless otherwise mentioned in the text:
According to a 1st aspect, a subject-matter of the present invention is a compound of formula (I):
in which:
A can represent an —NR1R′1 group in which:
piperazinyl
piperidinyl
or N—[(C1-C4)alkyl]piperidinyl
for example N-methylpiperidinyl, group.
R1 can be chosen from one of those described in Table I.
and R′1 represents a hydrogen atom or a (C1-C6)alkyl group. R′1 can be chosen from one of those described in Table I. An R1/R′1 combination can also be chosen from one of those described in Table I.
(ii) R1 and R′1 form, together with the nitrogen atom to which they are connected, a heterocycloalkyl group, for example the pyrrolidinyl
piperidinyl
or azetidinyl
group.
A can also represent a (C1-C6)alkoxy group, for example the ethoxy group.
R2 can represent an —NHR4 group (Q=—NH—) in which R4 represents:
or 4-N—[(C1-C4)alkyl]piperidinyl
for example 4-N-methylpiperidinyl, group;
The heterocycloalkyl group formed by Rc and Rd can, for example, be the pyrrolidinyl
piperidinyl
piperazinyl
or N—[(C1-C4)alkyl]piperazinyl
for example N-methyl- or N-propylpiperazinyl, azepanyl
morpholinyl
thiomorpholinyl
1-oxothiomorpholinyl
or 1,1-dioxothiomorpholinyl
group.
The heterocycloalkyl group formed by Rc and Rd can optionally be substituted by one or more substituent(s), which are identical to or different from one another when there are several of them, chosen from: —OH; (C1-C4)alkoxy: for example methoxy; (C1-C4)alkyl: for example methyl; halogen atom: for example fluorine atom. Thus, the substituted heterocycloalkyl can be the 3-hydroxypiperidinyl
or 4-hydroxypiperidinyl
4,4′-difluoropiperidinyl
4-methoxypiperidinyl
2-methylpyrrolidinyl
cis-2,6-dimethylmorpholinyl
or 3-fluoropyrrolidinyl
group.
R2 can also represent an —OR4 group (Q=—O—) in which R4 represents a (C1-C4)alkyl group optionally substituted by the preceding —NRcRd group. It can, for example, be the piperidinyl group
R2 or R4 can be chosen from one of those described in Table I.
A pyridine ring can comprise from 1 to 4 R3 substituents chosen from a hydrogen or fluorine atom or a (C1-C4)alkyl, (C1-C4)alkoxy, —OH, —CN or —NReRf group in which Re and Rf represent a hydrogen atom or a (C1-C4)alkyl group or else Re represents a hydrogen atom and Rf represents a (C1-C4)alkyl, —C(═O)(C1-C4)alkyl or —C(═O)(C1-C4)alkyl group. R3 can be chosen from those described in Table I.
Preferably, R3 is in the 5 or 6 position on the pyridine ring (the L group being in the 3 position on this ring), as represented below:
R3 is more preferably still in the 6 position. Preferably R3 represents a hydrogen atom or 5- or 6-NH2. When R3 represents the —OH group in the 2 or 6 position (cf. compound No. 123), the pyridine ring also exists in the 2-pyridone form:
case of the —OH group in the 6 position
L represents a —CH═CH—, —CH2CH2— or —(CH2)n—Y— group in which the Y group (attached to the C═O) represents an oxygen atom or an —NH— group and n is an integer ranging from 1 to 4. L can be one of those described in Table I. Preferably, L represents the —CH2—NH—, —CH2—O— or —CH═CH— group. Preference is also given, in the case where L represents the —CH═CH— group, to the E isomers rather than the Z isomers.
The ring comprising Z and Z′ can be one of the following rings:
According to a 1st combination,
More particularly, R1 represents a (C1-C6)alkyl group and R′1 represents a hydrogen atom or else R1 and R′1 represent two (C1-C6)alkyl groups.
According to a 2nd combination,
According to a 3rd combination,
Ra and Rb can be identical and both represent a hydrogen atom or a (C1-C6)alkyl group or else can be different and represent a hydrogen atom and a (C1-C6)alkyl group.
According to a 4th combination,
According to a 5th combination,
R1 can be the cyclopropyl, cyclobutyl, cyclopentyl or cyclohexyl group. R4 can be the cyclopropyl or cyclopentyl group.
According to a 6th combination,
According to a 7th combination,
According to an 8th combination,
The subgroup of compounds of formula (I′):
in which R1, R′1, R2, R3 and L are as defined above, in particular according to one of the combinations 1 to 8, is distinguished. More particularly, L represents the —(CH2)n—Y— group in which n is an integer ranging from 1 to 4 (n=1, 2, 3 or 4) and Y represents an oxygen atom or an NH group. More particularly, L represents the —CH2NH— group.
The subgroup of compounds of formula (I″):
in which R1, R′1, R4 are as defined above, in particular according to one of the combinations 1 to 8, is also distinguished.
Mention may be made, among the compounds which are the subject-matter of the invention, of those of Table I.
The compounds of the invention can exist in the form of bases or of addition salts with acids. Such addition salts also come within the invention. These salts are advantageously prepared with pharmaceutically acceptable acids but the salts of other acids of use, for example, in the purification of the isolation of the compounds also come within the invention. The compounds according to the invention can also exist in the form of hydrates or solvates, namely in the form of combinations or associations with one or more molecules of water or with a solvent. Such hydrates and solvates also come within the invention.
The compounds can comprise one or more asymmetric carbon atoms. They can also exist in the form of an enantiomers or diastereoisomers. These enantiomers or diastereoisomers and their mixtures come within the invention.
According to 2nd aspect, the subject-matter of the invention is the process for preparation of the compounds of the invention and some of the reaction intermediates.
Preparation of the Compounds of Formula (I) for which L=-(CH2)nY and R2═NHR4
These compounds can be prepared according to one of the following schemes 1-3.
A coupling of Suzuki type of P3 and P6 is carried out. Hal represents the halogen atom (chlorine, bromine, iodine). The coupling is carried out in the presence of a palladium (in the (0) or (II) oxidation state) complex, such as, for example, Pd(PPh3)4, PdCl2(PPh3)2, Pd(OAc)2 or PdCl2(dppf) or bis[di(tert-butyl)(4-dimethylaminophenyl)phosphine]dichloropalladium(II). The most frequently used complexes are palladium(0) complexes. The coupling is promoted in the presence of a base, which can, for example, be K2CO3, NaHCO3, Et3N, K3PO4, Ba(OH)2, NaOH, KF, CsF, Cs2CO3, and the like. The coupling can be carried out in a mixture of an ethereal solvent and of an alcohol, for example a dimethoxyethane/ethanol mixture; the mixture can also be a toluene/water mixture (see ex. 19). The temperature can be between 50 and 100° C.
Further details with regard to Suzuki coupling, with regard to the operating conditions and with regard to the palladium complexes which can be used will be found in: N. Miyaura and A. Suzuki, Chem. Rev. (1995), 95, 2457-2483; A. Suzuki in Metal-catalyzed cross-coupling reactions, edited by Diederich, F. and Stang, P. J., Wiley-VCH: Weinheim, Germany, 1998, chapter 2, 49-97; and Littke, A. and Fu, G., Angew. Chem. Int. Ed. (1999), 38, 3387-3388.
K and K′ represent a hydrogen atom or an alkyl or aryl group, optionally connected to one another in order to form, together with the boron atom and the two oxygen atoms, a 5- to 7-membered ring. Use will be made, for example, of one of the following groups:
P2 is obtained from the acid P1 by monosubstitution in 2 position with an amine of formula R1R′1NH. In the case where Z and Z′ respectively represent N and CH, P1 is a 2,6-dihalonicotinic acid, for example 2,6-dichloronicotinic acid, which is commercially available (cf. ex. 1). The reaction can take place at ambient temperature and in a protic solvent, such as an alcohol or water.
In the case where Z and Z′ both represent N and Hal represents a chlorine atom, P2 is obtained from 2,4-dihydroxypyrimidine-5-carboxylic acid (cf. ex. 11).
P3 is prepared by amidation by reacting P2 with an excess of amine R4NH2. Use may advantageously be made of an acid activator (coupling agent), such as, for example (benzotriazol-1-yloxy)tris(dimethylamino)-phosphonium hexafluorophosphate (or BOP, CAS: 56602-33-6, see also B. Castro. and Dormoy, J. R. Tetrahedron Letters, 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).
P6 is prepared by reacting P4 and P5 in the presence of an agent which makes it possible to introduce the “C═O” unit (for example phosgene, triphosgene or N,N′-disuccinimidyl carbonate DSC). Advantageously, the reaction is carried out in the presence of triphosgene. It is also 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 in an ethereal solvent, such as THF. 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenylamine has frequently been used for P5. Example 8.1 presents an illustrative procedure for this reaction.
P4 may be either commercially available or prepared according to methods known to the person skilled in the art. For example, the compounds 3-picolylamine (CAS No. 3731-52-0), 3-(2-aminoethyl)pyridine (CAS No. 20173-24-4), 3-pyridinemethanol (CAS No. 100-55-0), 5-aminoethyl 2-pyridinecarbonitrile (CAS No. 181130-14-3), 2-amino-5-aminomethylpyridine (CAS No. 156973-09-0), 2-fluoro-3-aminomethylpyridine (CAS No. 205744-16-7), 2,5,6-trifluoro-3-(aminomethyl)pyridine (CAS No. 771585-56-0), 2-methyl-5-aminomethylpyridine (CAS No. 56622-54-9), 3-methyl-5-aminomethylpyridine (CAS No. 771574-45-9), 2-methoxy-3-aminoethylpyridine (CAS No. 354824-19-4), 5-aminoethyl-1H-pyridin-2-one (CAS No. 131052-84-1) and 2-(BOC-amino)-5-(aminomethyl)pyridine (CAS No. 187237-37-2) are commercial products. 2-amino-5-aminomethylpyridine can also be prepared according to EP 0607804. 2-amino-5-aminomethylpyridine and 6-amino-3-aminomethyl-5-methylpyridine can be prepared according to preparations D and F of EP 1050534. 2-fluoro-5-aminomethylpyridine (CAS No. 205744-17-8) can be prepared according to Chinese Journal of Chemistry, 2006, 24(4), 521-526. 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. 3-fluoro-5-aminomethylpyridine (CAS No. 23586-96-1) and 2-fluoro-3-aminomethylpyridine can be prepared according to WO 2005066126 (preparations 46 and 47). 2-amino-3-methyl-5-aminomethylpyridine (CAS No. 187163-76-4) can be obtained by catalytic hydrogenation of the compound 6-amino-5-methylpyridinecarbonitrile (CAS No. 183428-91-3), the amine functional group being doubly protected with BOC. Likewise, the catalytic hydrogenation of N-(5-cyano-2-pyridinyl)acetamide (CAS No. 100130-61-8) and N-(5-cyano-2-pyridinyl)isobutyramide makes it possible to obtain the aminomethyl equivalents. Catalytic hydrogenation of 6-isopropylaminonicotinonitrile (CAS No. 160017-00-5) and 6-ethylamino-3-pyridinecarbonitrile (CAS No. 1016813-34-5) likewise produces the aminomethyl equivalents. Catalytic hydrogenation of 6-methylamino-3-pyridinecarbonitrile (CAS No. 261715-36-0) makes it possible to access 2-methylamino-5-aminomethylpyridine.
In Scheme 2, the Suzuki coupling (as described above) between P2 (for example, Hal=Cl when Z and Z′ respectively represent N and CH) and P6 is first carried out in order to result in P8 and then the R4 group is introduced by reacting the acid functional group of P8 with an excess of amine R4NH2 (amidation). An acid activator, such as, for example, BOP, is advantageously used to activate the reaction. In the case where R4 represents a pyridine group (cf. compounds No. 67 and 68), the activator can, for example, be EDCl (1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride).
In Scheme 3, the Suzuki coupling of P3 and P5 is carried out in order to give P9 and then P9 and P4 are reacted in the presence of an agent which makes it possible to introduce the “C═O” unit and optionally of a base, such as triethylamine. The reaction is carried out in an ethereal solvent, such as THF, preferably at an ambient temperature. Preferably, DSC is used to introduce the “C═O” unit.
Preparation of the Compounds of Formula (I) for which L=—(CH2)nY— and R2=—OR4
According to an alternative form of Scheme 2, these compounds are prepared by esterification of P8 and of R4OH (Scheme 2′).
According to an alternative form of Scheme 3, it is also possible to use P′3 in place of P3. P′3 is obtained by esterification of P2 and of R4OH (Scheme 3′):
Esterification is known to a person skilled in the art and consists in reacting the acid functional group of P2 or P8 with the alcohol R4OH in the optional presence of a strong acid as catalyst (cf. Practical Organic Chemistry, A. I. Vogel, 3rd ed., page 382) or of an acid activator, such as EDCl.
Preparation of the compounds of formula (I) for which L=—CH═CH— and R2═NHR4
These compounds are obtained by coupling of Suzuki type of P3 (for example, Hal=Cl when Z and Z′ respectively represent N and CH) and of P11. P11 is obtained by an amidation between P5 and P10. The amidation can advantageously be carried out in the presence of an acid activator, such as, for example, BOP.
P10 may either be commercially available or be prepared according to methods known to a person skilled in the art. For example, trans-3-(3-pyridyl)acrylic acid is sold by Sigma-Aldrich. P10 can also be prepared according to J. Org. Chem., 1998, 63, 8785-8789, from the corresponding β-formylpyridine.
According to Scheme 5, P10 is reacted with P9, advantageously in the presence of an acid activator, such as, for example, BOP.
Preparation of the Compounds of Formula (I) for which L=—CH2CH2— and R2═NHR4
For these compounds, use may be made of the preceding Scheme 4 using P12 in place of P10:
P12 may either be commercially available or be prepared according to methods known to a person skilled in the art. For example, 3-(3-pyridinyl)propanoic acid is sold by Sigma-Aldrich. P12 can also be prepared by hydrogenation of P10 (Journal of Medicinal Chemistry, 1993, 36(22), 3293-9).
Use may also be made of P12 in place of P10 in the preceding Scheme 5.
Preparation of the Compounds of Formula (I) for which L=—CH═CH— or —CH2CH2— and R2=—OR4
P11 and P′3 (in place of P3) are reacted in the preceding Scheme 4 in order to obtain compounds of formula (I) for which L=—CH═CH— and R2=—OR4. Likewise, starting from P′3 and P12, the compounds of formula (I) for which L=—CH2CH2— and R2=—OR4 are obtained.
The compounds for which A represents a (C1-C6)alkoxy group are obtained according to Schemes equivalent to the preceding Schemes starting from an equivalent compound P13.
P13 can be obtained according to Scheme 6. Amidation with R4NH2 can be carried out in the presence of an acid activator, such as, for example, N,N′-carbonyldiimidazol (CDI) (see in this connection: R. Paul and G. W. Anderson (1960), “N,N′-carbonyldiimidazole, a New Peptide Forming Reagent”, Journal of the American Chemical Society, 82: 4596-4600). The reaction can be carried out in a solvent such as THF. The conditions of Ex. 10.1 may act as a model. The following stage is carried out in the presence of the alkoxide R″1O−. The reaction can be carried out in THF at a temperature of the order of 70° C. The conditions of Ex. 10.2 may act as a model.
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 functional group, in particular a primary or secondary amine functional group. For example, when Rc and Rd both represent a hydrogen atom, the amidation of Scheme 2 is carried out using, for R4NH2, the compound H2N—(C1-C6)alkyl-NH-PG, where PG advantageously represents BOC (tert-butoxycarbonyl). Thus, for compound No. 32, the compound H2N—(CH2)6—NHBOC was used for R4NH2. Likewise, when the heterocycloalkyl group formed by Rc and Rd represents the piperazinyl group
the —NH— functional group thereof can advantageously be protected. In this case, the following compound
where PG advantageously represents BOC, is used. Likewise, when R3 represents —NH2 or —NH-alkyl, the —NH— functional group is preferably protected, advantageously using BOC (see, for example, compounds No. 81, 87, 93, 94 and 98), which makes it possible to increase the yield of desired product.
The functional group(s) is/are subsequently obtained by a stage of deprotection (final or intermediate), the conditions of which depend on the nature of the protected functional group(s) and protective group used. In the case of the protection of the —NH2 or —NH-functional groups by BOC, the deprotection stage is carried out in an acid medium using, for example, HCl or triflic acid. If appropriate, the associated salt (hydrochloride or triflate) is thus obtained; see compounds No. 5, 32, 94, 104 or 119. Another method of obtaining the salts consists in bringing the compound into contact in its base form with the acid.
In the preceding Schemes, the starting compounds and the reactants, when their method of preparation is not described, are commercially available or described in the literature, or else can be prepared according to methods which are described therein or which are known to a person skilled in the art. A person skilled in the art can also draw as a model on the operating conditions given in the examples which are described below.
According to a 3rd aspect, the invention relates to 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 a person skilled in the art according to the pharmaceutical form and the method of administration desired. The method of administration can, for example, be via the oral route or via the intravenous route.
According to a 4th aspect, the subject-matter of the invention is a medicament which comprises a compound as defined above, and also the use of a compound as defined above in the manufacture of a medicament. It will be of use in treating a pathological condition, in particular cancer.
This medicament can have a therapeutic use, in particular in the treatment or the prevention of diseases caused or exacerbated by the proliferation of cells and in particular tumour cells.
The medicament (and also a compound according to the invention) can be administered in combination with one (or more) anticancers, in particular chosen from:
It is also possible to combine a treatment by radiation. This treatment can be administered simultaneously, separately or else sequentially. The treatment will be adapted by the practitioner according to the patient and the tumour to be treated.
According to a 5th aspect, the invention also relates to a method for the treatment of the pathologies indicated above which comprises the administration to a patient of an effective dose of a compound according to the invention or one of its pharmaceutically acceptable salts or its hydrates or its solvates.
The following examples illustrate the preparation of some compounds in accordance with the invention. These examples are not limiting and serve only to illustrate the present invention. The numbers of the compounds exemplified refer to those given in the table below, in which the chemical structures and the physical properties of some compounds according to the invention are illustrated.
The compounds have been analyzed by HPLC-UV-MS coupling (liquid chromatography, ultraviolet (UV) detection and mass detection). The device used is composed of an Agilent chromatographic sequence equipped with an Agilent diode array detector and with a Waters ZQ single quadrupole mass spectrometer or a Waters Quattro-Micro triple quadrupole mass spectrometer.
The liquid phase chromatography/mass spectrometer (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+, and the like. 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 I/h.
The HPLC conditions are chosen from one of the following methods:
26.1 g (0.136M) of 2,6-dichloronicotinic acid are mixed in a round-bottomed flask with 180 ml of a 70% aqueous solution of ethylamine in water. The solution is stirred at ambient temperature for 5 days and then the solvent is evaporated under reduced pressure. The residue is taken up in 100 ml of water. The reaction medium is cooled with an ice bath and acidified to pH 3 with the 5N HCl solution. Finally, the precipitate is filtered off and washed with cold water in order to be finally dried under vacuum over P2O5 at 60° C. 24.93 g (yield yd=91.4%) of white solid are obtained. M.p. (melting point)=157-159° C.
2.09 ml (15 mm) of triethylamine, 5 ml (10 mm) of a 2N solution of methylamine in THF and 2.06 g (5 mm) of BOP are successively added to a solution of 1.003 g (5 mm) of compound obtained in stage 1.1 in 40 ml of THF. The medium is stirred at ambient temperature for 18 h, followed by evaporation of the solvent under reduced pressure. The residue is taken up in ethyl acetate and then successively washed with water, a 3% solution of KHSO4 in water, a 10% solution of Na2CO3 in water and a saturated NaCl solution. 1.06 g of nicotinamide are obtained. The yield is quantitative. (LC/MS; MH+ 214, retention time tr=7.48 min).
57.2 ml (410.8 mm) of triethylamine are introduced dropwise into a mixture of 15 g (68.47 mm) of 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenylamine and of 12.19 g (41.08 mm) of triphosgene in 15 l of THF cooled with an ice/water bath to a temperature of between 0° C. and 5° C. After stirring at a temperature of between 0° C. and 5° C. for 1 h, 8.29 g (76.68 mm) of 3-(aminomethyl)pyridine are added to a reaction medium. The mixture is stirred for 20 h while allowing the temperature to rise to ambient temperature. The THF is evaporated. The ratio is taken up in water and then extracted with ethyl acetate. The organic phase is subsequently dried over Na2SO4, filtered and evaporated. The residue is recrystallized from a minimum amount of ethyl acetate. 13 g (yd=53.8%) of white solid composed of 89% of the expected compound and 11% of the corresponding boronic acid are obtained (LC/MS; MH+ 354 and 272, tr=6.25 and 3.65 min).
16 ml of saturated NaHCO3 solution, followed by 0.173 g (0.15 mm) of Pd(PPh3)4), are added, at ambient temperature under an argon atmosphere, to a solution of 0.320 g (1.5 mm) of the compound obtained in stage 1.2 and 0.648 g (1.65 mm) of the compound obtained in stage 1.3 in 40 ml of dimethoxyethane and 8 ml of ethanol. The reaction medium is immersed in an oil bath preheated to 100° C. and heating is carried out at this temperature for 3 h. The solvents are evaporated under reduced pressure and the residue is taken up in a dichloromethane (DCM)/water mixture. The precipitate is filtered off. The filtrate is subsequently purified by chromatography on a silica column (DCM:MeOH-10:0.7). After evaporating the solvents, the residue is taken up in ethyl acetate and then filtered. The filtrate is then dried under vacuum at 60° C. 0.387 g of a solid is obtained. The yield is thus 63.7%. M.p.=260-263° C. (LC/MS; MH+ 405, tr=5.61 min). 1H NMR (d6-DMSO, 250 MHz): 1.21 (t, 3), 2.75 (d, 3), 3.52 (qd, 2), 4.35 (d, 2), 6.80 (t, 1), 7.09 (d, 1), 7.38 (dd, 1), 7.52 (d, 2), 7.74 (td, 1), 7.93 (d, 1), 8.02 (d, 2), 8.41 (m, 1), 8.47 (m, 1), 8.48 (m, 1), 8.55 (d, 1), 8.88 (s, 1).
9.6 g (50 mm) of 2,6-dichloronicotinic acid are mixed in a glass autoclave with 60 ml of 32% aqueous ammonia solution. The reaction medium is immersed in an oil bath preheated to 130° C. and heating is carried out at this temperature for 68 h. The solution is allowed to return to ambient temperature. The reaction medium is concentrated under reduced pressure. The residue is taken up in 200 ml of water and ice and acidified to pH 2 with a concentrated HCl of solution. Ethyl acetate is added and the medium is then stirred for 5 minutes and filtered. The aqueous phase is separated by settling and the organic phase is washed with a saturated in NaCl solution. The organic phase is dried over sodium sulphate and filtered, and the solvent is evaporated. 5.83 g of product (Yd: 67.5%) are obtained (LC/MS; MH+ 173, tr=6.03 min).
6.26 ml (45 mm) of triethylamine, 15 ml (30 mm) of a 2N solution of methylamine in THF and 6.17 g (14 mm) of BOP are successively added to a solution of 2.59 g (15 mm) of the compound obtained in stage 1.1 in 50 ml of anhydrous THF. The medium is stirred at ambient temperature for 18 h, followed by evaporation of the solvent under reduced pressure. The residue is taken up in ethyl acetate and then washed successively with water, a 3% solution of KHSO4 in water, a 10% solution of Na2CO3 in water and a saturated NaCl solution. 2.046 g of nicotinamide are obtained. The yield is quantitative. M.p.=204-207° C. (LC/MS; MH+ 186, tr=6.72 min).
16 ml of saturated NaHCO3 solution, followed by 0.231 g (0.20 mm) of Pd(PPH3)4 are added, at ambient temperature under an argon atmosphere, to a solution of 0.317 g (2 mm) of the compound obtained in stage 2.2 and 0.777 g (2.20 mm) of the compound obtained in stage 1.3 in 40 ml of dimethoxyethane and 8 ml of ethanol. The reaction medium is immersed in an oil bath and heated at 100° C. for 3 h. The solvents are evaporated under reduced pressure. The residue is taken up in a DCM/water mixture. The precipitate is filtered off and then purified by chromatography on a silica column (dichloromethane (DCM):MeOH-10:1). 0.507 g of nicotinamide derivative is obtained. The yield is thus 67.3%. M.p.=234-236° C. (LC/MS; MH+ 376, tr=4.47 min). 1H NMR (d6-DMSO, 400 MHz): 2.75 (d, 3), 4.33 (d, 2), 6.79 (t, 1), 7.10 (d, 1), 7.15 (bs, 2), 7.36 (dd, 1), 7.49 (d, 2), 7.72 (td, 1), 7.91 (d, 1), 7.95 (d, 2), 8.34 (q, 1), 8.46 (d, 1), 8.53 (bs, 1), 8.84 (s, 1).
24.0 g (0.125 m) of 2,6-dichloronicotinic acid are mixed in a round-bottomed flask with 124.53 ml of N,N-dimethylaminoethylamine. The solution is then stirred at ambient temperature for 6 days. The excess amine is subsequently evaporated under reduced pressure. The residue is taken up in the minimum amount of water. The reaction medium is cooled with an ice bath and acidified to pH 3 with a 5N HCl solution. Finally, the precipitate is filtered off and washed with cold water in order to be finally dried under vacuum over P2O5 at 60° C. 26 g (yd=87.7%) of white solid are obtained. M.p.=170-172° C. (LC/MS, MH+ 244, tr=4.73 min).
0.62 ml (4.9 mm) of triethylamine, 1.64 ml (3.3 mm) of a 2N solution of methylamine in THF and 0.68 g (1.52 mm) of BOP are successively added to a solution of 0.400 g (1.6 mm) of the compound obtained in stage 3.1 in 20 ml of THF and two drops of DMF. The medium is stirred at ambient temperature overnight, followed by evaporation of the solvent under reduced pressure. The residue is taken up in ethyl acetate and then successively washed with water, a 3% solution of KHSO4 in water, a 10% solution of Na2CO3 in water and a saturated NaCl solution. 0.3 g (yd=71%) of nicotinamide derivative is obtained. (LC/MS; MH+ 257, tr=4.24 min).
20 ml of saturated NaHCO3 solution, followed by 0.135 g (0.12 mm) of Pd(PPh3)4, are added, at ambient temperature under an argon atmosphere, to a solution in a three-necked flask of 0.300 g (1.2 mm) of the compound obtained in stage 3.2 and 0.454 g (1.29 mm) of the compound obtained in stage 1.3 in 40 ml of dimethoxyethane and 8 ml of ethanol. The mixture is heated at 100° C. for 3 h. The solvents are evaporated under reduced pressure and the residue is taken up in water. The precipitate is filtered off and then purified by flash chromatography (DCM; MeOH 10-30%; NH4OH 1%). 0.070 g of solid is obtained. The yield is thus 13.8%. M.p.=163-165° C. (LC/MS; MH+ 448, tr=4.53 min). 1H NMR (d6-DMSO, 250 MHz): 2.22 (s, 6), 2.50 (m, 2), 2.75 (d, 3), 3.59 (q, 2), 4.34 (d, 2), 6.82 (t, 1), 7.08 (d, 1), 7.37 (dd, 1), 7.51 (d, 2), 7.73 (d, 1), 7.92 (d, 1), 8.01 (d, 2), 8.36 (q, 1), 8.46 (dd, 1), 8.54 (s, 1), 8.58 (t, 1), 8.88 (s, 1).
50 ml of saturated NaHCO3 solution, followed by 1.152 g (1.00 mm) of Pd(PPh3)4, are added, at ambient temperature under an argon atmosphere, to a solution in a three-necked flask of 2.0 g (9.97 mm) of the compound obtained in stage 1.1 and 3.873 g (10.97 mm) of the compound obtained in stage 1.3 in 200 ml of dimethoxyethane and 40 ml of ethanol. The mixture is heated at 90° C. for 20 h. The solvents are evaporated under reduced pressure and the residue is taken up in an ethyl acetate/water mixture. The aqueous phase is separated by settling and then acidified to pH=6 with a concentrated HCl solution. The precipitate is filtered off, washed with water and dried in an oven. 3.8 g of solid are obtained. Yd: 97.4%. M.p.=216-218° C. (LC/MS; MH+ 392, tr=5.20 min).
0.27 ml (1.92 mm) of triethylamine, 0.22 ml (1.28 mm) of 2-diisopropylaminoethylamine and 0.263 g (0.60 mm) of BOP are successively added to a solution of 0.250 g (0.64 mm) of the compound obtained in stage 4.1 in 20 ml of THF. The reaction medium is stirred at ambient temperature for 3 days, followed by evaporation of the solvent under reduced pressure. The residue is taken up in DCM and then successively washed with water and a saturated NaCl solution. The organic phase is finally dried and concentrated. The residue is purified by flash chromatography (DCM; MeOH 5-30%; NH4OH 1%). 0.25 g (yd=75.5%) of white solid is obtained. M.p.=160-162° C. (LC/MS; MH+ 518, tr=5.32 min). 1H NMR (d6-DMSO 250 MHz): 0.98 (d, 12), 1.21 (t, 3), 2.52 (m, 2), 2.97 (m, 2), 3.17 (m, 2), 3.52 (m, 2), 4.34 (d, 2), 6.79 (t, 1), 7.08 (d, 1), 7.36 (dd, 1), 7.50 (d, 2), 7.72 (td, 1), 7.92 (d, 1), 8.00 (d, 2), 8.33 (t, 1), 8.46 (m, 2), 8.54 (s, 1), 8.86 (s, 1).
A solution of 1.2 g (6.25 mm) of 2,6-dichloronicotinic acid and of 1.91 ml (18.75 mm) of 4-pyridylmethylamine in 10 ml of isopropanol is heated in a glass autoclave at 90° C. for 12 h. The precipitate is filtered off and washed with ethyl acetate. The solvent is evaporated under reduced pressure. The residue is taken up in 2 ml of water. The reaction medium is acidified using acetic acid until precipitation has occurred. The precipitate is filtered off and then washed with cold water in order to be finally dried in an oven over P2O5. 1.1 g (yd=66.7%) of white solid are obtained. M.p.=217-220° C. (LC/MS; MH+ 264, tr=4.99 min).
0.47 ml (4.6 mm) of triethylamine, 1.52 ml (3.0 mm) of a 2N solution of methylamine in THF and 0.497 g (1.12 mm) of BOP are successively added to a solution of 0.400 g (1.5 mm) of the compound obtained in stage 5.1 in 20 ml of THF. The medium is stirred at ambient temperature for 18 h, followed by evaporation of the solvent under reduced pressure. The residue is taken up in DCM and then successively washed with water, a 3% solution of KHSO4 in water, a 10% solution of Na2CO3 in water and a saturated NaCl solution. The organic phase is dried and the DCM is evaporated. The residue is purified by flash chromatography (DCM; MeOH 1-5%). 0.3 g of nicotinamide (yd=71.4%) is obtained (LC/MS; MH+ 277, tr=5.04 min).
20 ml of a saturated NaHCO3 solution, followed by 0.173 g (0.15 mm) of Pd(PPh3)4, are added, at ambient temperature under an argon atmosphere, to a solution of 0.300 g (1.1 mm) of the compound obtained in stage 5.2 and 0.421 g (1.19 mm) of the compound obtained in stage 1.3 in 40 ml of dimethoxyethane and 8 ml of ethanol. The mixture is heated at 100° C. for 6 h. The solvents are evaporated under reduced pressure and the residue is taken up in a DCM/water mixture. The precipitate is filtered off. The organic phase, after extraction, is concentrated. The precipitate and the residue are subsequently purified by flash chromatography (DCM; MeOH 1-15%). 0.4 g of solid is obtained. The yield is thus 80%. M.p.=218-219° C. (LC/MS; MH+ 468, tr=4.96 min). 1H NMR (d6-DMSO, 400 MHz): 2.78 (s, 3), 4.33 (m, 2), 4.75 (m, 2), 6.78 (q, 1), 7.13 (m, 1), 7.35 (m, 3), 7.44 (m, 2), 7.71 (m, 1), 7.84 (m, 2), 7.97 (m, 1), 8.49 (m, 4), 8.53 (m, 1), 8.80 (m, 1), 9.03 (m, 1).
20 ml of saturated NaHCO3 solution, followed by 0.325 g (0.28 mm) of Pd(PPh3)4, are added, at ambient temperature under an argon atmosphere, to a solution of 0.600 g (2.81 mm) of the compound obtained in stage 1.2 and 0.677 g (3.1 mm) of 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenylamine in 40 ml of dimethoxyethane and 8 ml of ethanol. The mixture is heated at 90° C. for 3 h. The solvents are evaporated under reduced pressure and the residue is taken up in a DCM/water mixture. The precipitate is filtered off. The organic phase, after washing with water and a saturated NaCl solution, is dried and concentrated. The filtrate and the residue are subsequently purified by flash chromatography (DCM; MeOH 0-1%). 0.680 g of white solid is obtained. The yield is thus 89.5%. (LC/MS; MH+ 271, tr=6.01 min).
0.369 g (3.02 mm) of dimethylaminopyridine and 0.773 g (3.02 mm) of disuccinimidyl carbonate are added, at ambient temperature under an argon atmosphere, to a solution of 0.680 g (2.52 mm) of the compound obtained in stage 6.1 in 80 ml of anhydrous THF and the mixture is then stirred for 12 h. After the addition of 2.10 ml (15.09 mm) of triethylamine and 0.482 g (3.02 mm) of 5-aminomethylpyridin-2-ylamine, the mixture is stirred at ambient temperature for 18 h. The reaction medium is subsequently concentrated. The residue is taken up in water and DCM and then filtered. The insoluble material is again washed with water and DCM in order to be finally dried in an oven. The product is purified by flash chromatography (DCM; MeOH 1-10%). 0.45 g (yd 42.6%) of product is obtained. M.p.=223-226° C. (LC/MS; MH+ 420, tr=5.26 min). 1H NMR (d6-DMSO, 250 MHz): 1.16 (t, 3), 2.67 (d, 3), 3.47 (m, 2), 4.06 (d, 2), 5.80 (bs, 2), 6.38 (d, 1), 6.47 (t, 1), 7.03 (d, 1), 7.31 (dd, 1), 7.45 (d, 2), 7.82 (d, 1), 7.88 (d, 1), 7.96 (d, 2), 8.34 (q, 1), 8.42 (t, 1), 8.66 (s, 1).
1 ml (10.9 mm) of aniline is dissolved in 15 ml of anhydrous THF in a three-necked flask under argon and 16.7 ml (16.7 mm) of lithium bis(trimethylsilyl)amide (1M in THF) are added dropwise at a temperature of −75° C. This medium is stirred at this temperature for 1 h. 1 g (5.2 mm) of 2,6-dichloronicotinic acid dissolved in 10 ml of anhydrous THF is added to the reaction medium. The medium is allowed to return to ambient temperature and stirred at this temperature for 12 h. 2-3 ml of water are added to the reaction medium. It is then cooled in an ice bath and acidified to pH 2 with a 5N HCl solution. Extraction is carried out with ethyl acetate. The aqueous phase is subsequently extracted several times with ethyl acetate. The organic phases are subsequently washed with water and saturated NaCl solution. The organic phase is dried and then concentrated. (The residue is purified by flash chromatography). 1.1 g (85.3%) of white solid are obtained. M.p.=181-185° C. (LC/MS; MH+ 249, tr=6.99 min).
0.84 ml (6 mm) of triethylamine, 2.01 ml (4.0 mm) of a 2N solution of methylamine in THF and 0.658 g (1.5 mm) of BOP are successively added to a solution of 0.500 g (2.01 mm) of the compound obtained in stage 7.1 in 20 ml of THF. The medium is stirred at ambient temperature for 18 h, followed by evaporation of the solvent under reduced pressure. The residue is taken up in DCM and then successively washed with water and a saturated NaCl solution. The organic phase is dried and then concentrated. The residue is purified by flash chromatography (DCM:Heptane-1:1). 0.35 g of nicotinamide is obtained. (Yd=66.5%). (LC/MS; MH+ 262, tr=9.49 min).
15 ml of saturated NaHCO3 solution, followed by 0.155 g (0.13 mm) of Pd(PPh3)4, are added, at ambient temperature under an argon atmosphere, to a solution of 0.350 g (1.3 mm) of the compound obtained in stage 7.2 and 0.520 g (1.5 mm) of the compound obtained in stage 1.3 in 40 ml of dimethoxyethane and 8 ml of ethanol. The mixture is heated at 90° C. for 4 h. The solvents are evaporated under reduced pressure and the residue is taken up in a DCM/water mixture. The precipitate is filtered off. The organic phase, after washing with water and a saturated NaCl solution, is dried and concentrated. The precipitate and the residue are subsequently purified by flash chromatography (DCM; MeOH 1-10%). 0.530 g of white solid is obtained. The yield is thus 87.6%. M.p.=234-236° C. (LC/MS; MH+ 453, tr=6.70 min). 1H NMR (d6-DMSO, 250 MHz): 2.77 (d, 3), 4.30 (d, 2), 6.79 (t, 1), 6.94 (t, 1), 7.27-7.38 (unresolved peak, 4), 7.52 (d, 2), 7.69 (td, 1), 7.74 (d, 2), 7.99 (d, 2), 8.09 (d, 1), 8.43 (d, 1), 8.51 (d, 1), 8.67 (q, 1), 8.85 (s, 1), 11.15 (s, 1).
5.72 ml (41.08 mm) of triethylamine are introduced dropwise into a mixture of 1.5 g (6.85 mm) of 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenylamine and of 1.219 g (4.11 mm) of triphosgene in 200 ml of THF, cooled with an ice/water bath to a temperature of between 0° C. and 5° C. After stirring at a temperature of between 0° C. and 5° C. for 1 h, 0.837 g (7.67 mm) of 3-pyridylcarbinol is added to the reaction medium. The reaction medium is stirred for 20 h while allowing the temperature to rise to ambient temperature. The THF is evaporated. The residue is taken up in water and then extracted with ethyl acetate. The organic phase is washed with H2O and then with an H2O/NaCl solution in order to be subsequently dried over Na2SO4, filtered and evaporated. The residue is subsequently purified by flash chromatography (DCM; MeOH 1-5%). 2.0 g (yd=82.5%) of white solid composed of 76% of the expected compound and 24% of the corresponding boronic acid are obtained (LC/MS; MH+ 355 and 273, tr=8.62 and 5.78 min).
15 ml of saturated NaHCO3 solution, followed by 0.135 g (0.12 mm) of Pd(PPh3)4, are added, at ambient temperature under an argon atmosphere, to a solution of 0.250 g (1.17 mm) of the compound obtained in stage 1.2 and 0.456 g (1.29 mm) of the compound obtained in stage 8.1 in 38 ml of dimethoxyethane and 7 ml of ethanol. The reaction medium is immersed in an oil bath preheated to 90° C. and heating is carried out at this temperature for 3 h. The solvents are evaporated under reduced pressure and the residue is taken up in a DCM/H2O mixture. The precipitate is filtered off. The filtrate is subsequently purified by flash chromatography on a silica column (DCM; MeOH 5-10%). After evaporating the solvents, the residue is taken up in ethyl acetate and then filtered. The filtrate is then dried under vacuum at 60° C. 0.230 g of solid is obtained. The yield is thus 48.5%. M.p.=234-235° C. (LC/MS; MH+ 406, tr=6.74 min).
0.27 ml (1.92 mm) of triethylamine, 0.18 ml (1.28 mm) of 2-(piperidin-1-yl)ethylamine and 0.263 g (0.60 mm) of BOP are successively added to a solution of 0.25 g (0.64 mm) of the compound obtained in stage 4.1 in 20 ml of THF. The mixture is stirred at ambient temperature for 18 h. The medium is concentrated and then the residue is taken up in water. Extraction is carried out with DCM and washing is carried out successively with water and then a saturated sodium chloride solution. The organic phase is dried on sodium sulphate, filtered and evaporated. The residue is purified by flash chromatography (DCM; MeOH 1-20%). 0.23 g (yd=71.9%) is obtained. M.p.=164-165° C. LC/MS; MH+ 502, tr=5.31 min. 1H NMR (d6-DMSO, 250 MHz): 1.21 (t, 3), 1.29-1.56 (unresolved peak, 6), 2.33-2.48 (unresolved peak, 6), 3.30 (m, 2), 3.52 (m, 2), 4.36 (d, 2), 6.79 (t, 1), 7.09 (d, 1), 7.37 (t, 1), 7.51 (d, 2), 7.73 (d, 1), 7.92 (d, 1), 8.00 (d, 2), 8.33 (t, 1), 8.41 (t, 1), 8.46 (d, 1), 8.54 (s, 1), 8.86 (s, 1).
1.0 g (5.2 mmol) of 2,6-dichloronicotinic acid is dissolved in 10 ml of anhydrous THF in a 25 ml round-bottomed flask under a nitrogen atmosphere. 930 mg (5.7 mmol) of N,N′-carbonyldiimidazole are added and the mixture is stirred at ambient temperature for 30 min. 2.8 ml (5.7 mmol) of a 2.0M solution of methylamine in THF are added and the mixture is stirred at ambient temperature for 4 h. The mixture is hydrolysed with a saturated aqueous NH4Cl solution (10 ml) and extracted with ethyl acetate (4×10 ml). The organic phases are combined and then washed with 10 ml of a saturated aqueous NaCl solution. After separation, the organic phase is dried over MgSO4 and filtered, and the solvent is evaporated under reduced pressure. The residue is purified by flash chromatography on a silica column (40-63 μm) (eluent: AcOEt). The pure fractions are collected and then the solvent is evaporated under reduced pressure in order to obtain 380 mg (1.8 mmol) of the compound in the form of a white powder. Yd: 36%. 1H NMR, CDCl3, 300 MHz: 2.98 (d, J=4.9 Hz, 3H), 6.77 (bs, 1H), 7.30 (d, J=8.0 Hz, 1H), 7.95 (d, J=8.0 Hz, 1H).
380 mg (1.8 mmol) of compound 10.1 are dissolved in 10 ml of absolute ethanol in a 25 ml round-bottomed flask under a nitrogen atmosphere. 47 mg (2.0 mmol) of sodium are added and then the mixture is stirred at 70° C. for 16 h. The solvent is evaporated under reduced pressure and the residue is taken up in 25 ml of DCM. The precipitate is filtered off, triturated in ethyl ether and dried. 300 mg (1.4 mmol) of compound are isolated in the form of a white solid. Yd: 74%. 1H NMR, CDCl3 (300 MHz): 1.40 (t, J=7.1 Hz, 3H), 2.92 (d, J=6.7 Hz, 3H), 4.47 (q, J=7.1 Hz, 2H), 6.95 (d, J=8.0 Hz, 1H), 7.73 (bs, 1H), 8.36 (d, J=8.0 Hz, 1H).
300 mg (1.4 mmol) of compound 10.2 are dissolved in a mixture of 40 ml of DME and 10 ml of ethanol in a 100 ml round-bottomed flask. 340 mg (1.5 mmol) of p-aniline boronic ester are added, followed by 15 ml of a saturated aqueous NaHCO3 solution. The mixture is degassed using a stream of nitrogen, then 162 mg (0.1 mmol) of Pd(PPh3)4 are added and the mixture is heated at reflux for 16 h. After returning to ambient temperature, the mixture is filtered through a filter paper and the solvents are evaporated under reduced pressure. The residue is taken up in 25 ml of water and then extracted with 3×25 ml of AcOEt. The organic phases are combined and then washed with 25 ml of a saturated aqueous NaCl solution. After separation, the organic phase is dried over MgSO4 and filtered, and the solvent is evaporated under reduced pressure. The residue is purified by flash chromatography on a silica column (40-63 μm) (eluent: EtOAc). The pure fractions are collected and then the solvent is evaporated under reduced pressure in order to obtain 380 mg (1.4 mmol) of compound in the form of a pale yellow powder. Yd: quantitative. 1H NMR, CDCl3 (300 MHz): 1.51 (t, J=7.1 Hz, 3H), 3.02 (d, J=4.8 Hz, 3H), 3.90 (bs, 2H), 4.67 (q, J=7.1 Hz, 2H), 6.73 (d, J=8.7 Hz, 2H), 7.37 (d, J=8.0 Hz, 1H), 7.90 (d, J=8.7 Hz, 2H), 8.01 (bs, 1H), 8.49 (d, J=8.0 Hz, 1H).
380 mg (1.4 mmol) of compound 10.3 are dissolved in 50 ml of anhydrous THF in a 100 ml round-bottomed flask under a nitrogen atmosphere. 540 mg (2.1 mmol) of N,N′-disuccinimidyl carbonate and 256 mg (2.1 mmol) of dimethylaminopyridine are added and then the mixture is stirred at ambient temperature for 16 h. 585 μl (4.2 mmol) of triethylamine and a solution of 230 mg (2.1 mmol) of pyridin-3-ylmethylamine dissolved in 10 ml of anhydrous THF are added and then the mixture is stirred at ambient temperature for 8 h. The solvent is evaporated under reduced pressure. The residue is purified by flash chromatography on a silica column (40-63 μm) (eluent: DCM/MeOH, 90/10). The pure fractions are collected and then the solvent is evaporated under reduced pressure in order to obtain 20 mg (0.05 mmol) of the desired compound in the form of a white powder. Yd: 3%; M.p.=200° C. 1H NMR, CDCl3 (300 MHz): 1.44 (t, J=7.0 Hz, 3H), 2.84 (d, J=4.7 Hz, 3H), 4.34 (d, J=5.8 Hz, 2H), 4.60 (q, J=7.0 Hz, 2H), 6.81 (t, J=5.8 Hz, 1H), 7.37 (m, 1H), 7.54 (d, J=8.8 Hz, 2H), 7.59 (d, J=8.0 Hz, 1H), 7.72 (d, J=7.8 Hz, 1H), 8.03 (d, J=8.8 Hz, 2H), 8.12 (m, 1H), 8.20 (d, J=8.0 Hz, 1H), 8.46 (m, 1H), 8.54 (s, 1H), 8.91 (s, 1H).
2,4-Dihydroxypyrimidine-5-carboxylic acid (10 g, 64 mmol) is dispersed in POCl3 (45 ml) at 0° C. PCl5 (46.6 g, 224 mmol) is carefully added and the mixture is stirred under gentle reflux for 16 h. The slightly yellow solution is evaporated under reduced pressure and the solid is washed with toluene, and the solution is filtered and the filtrate evaporated to give 13.4 g (yd: 99%) of the compound. 1H NMR, d6-DMSO (300 MHz): 9.13 (s, 1H).
Compound 11.1 (13.5 g, 64 mmol) is dissolved in THF (100 ml). Ethanol (15 ml) is added and the mixture is stirred at ambient temperature for 10 min. The solvents are evaporated and an oil is recovered and hydrolysed with a saturated K2CO3 solution and extracted with AcOEt (3×250 ml). The organic phase is washed with an NaCl solution (100 ml) and dried over Na2SO4. After filtering and evaporating, an orange oil is recovered (14 g, yd: 99%). 1H NMR, d6-DMSO (300 MHz): 9.16 (s, 1H), 4.37 (q, 2H, J=7.11 Hz), 1.34 (t, 3H, J=7.11 Hz).
Compound 11.2 (14 g, 63.3 mmol) is dissolved in 150 ml of THF. Triethylamine (13 ml, 94.95 mmol) and a solution of ethylamine in THF (32 ml, 63.3 mmol) are added. The mixture is stirred at ambient temperature for 16 h. It is filtered and the solvent is evaporated. The residue is purified by column chromatography (40-63 μm, eluent: AcOEt/cyclohexane:20/80). The fractions are recovered and the solvent is evaporated. A white solid is obtained (9.2 g, yd: 63%). 1H NMR d6-DMSO (300 MHz): 8.59 (s, 1H), 8.50 (bs, 1H), 4.30 (q, 2H, J=7.08 Hz), 3.47 (m, 2H, J=7.08 Hz), 1.15 (t, 3H, J=7.17 Hz).
Compound 11.3 (9.2 g, 40 mmol) is dissolved in THF (250 mg). Water and then LiOH.H2O 2.5 g, 60 mmol) are added and the mixture is left stirring at ambient temperature for 16 h. The solvent is evaporated and a 1N HCl solution is added until precipitation is complete. After filtration, the solid is dried at 60° C. overnight. 8.0 g (yd: 99%) of the compound are obtained in the form of a white solid. 1H NMR, d6-DMSO (300 MHz): 8.65 (bs, 1H), 8.55 (s, 1H), 3.45 (m, 2H), 1.15 (t, 3H, J=7.17 Hz).
1.613 g (8 mm) of the compound obtained in stage 11.4, 3.11 g (8.8 mm) of the compound obtained in stage 8.1, 160 ml of DME, 32 ml of ethanol and 40 ml of saturated NaHCO3 solution are placed in a three-necked flask under an argon atmosphere. The mixture is degassed for 30 min and then 0.925 g (0.8 mm) of Pd(PPh3)4 is added. The mixture is heated at 100° C. for 6 h. The solvents are evaporated and the residue is taken up in water. The pH is adjusted to 3-4 with a 1N HCl solution. The precipitate is filtered off and dried under vacuum over P2O5. The precipitate is taken up in 400 ml of methanol at reflux and allowed to cool. The product is filtered off and dried under vacuum. 859 mg are obtained and are used as is in the following stage (LC/MS; MH+ 393, tr=4.90 min).
0.44 g (1.12 mm) of the compound obtained in stage 11.5 are placed in 30 ml of THF in a round-bottomed flask. 0.47 ml (3.36 mm) of triethylamine, 0.32 ml (2.24 mm) of 2-(piperidin-1-yl)ethylamine and 0.496 g (1.12 mm) of BOP are added. The mixture is stirred at ambient temperature for 18 h. The solvents are evaporated and the residue is taken up in ethyl acetate. The organic phase is washed with water and then a saturated NaCl solution. It is dried over Na2SO4, filtered and evaporated. The residue is purified by flash chromatography (DCM:MeOH 99:1 to 80:20). 220 mg are obtained. Yd: 33.6% (LC/MS; MH+ 503, tr=4.71 min). 1H NMR (250 MHz, d6-DMSO) δ ppm: 1.21 (t, 3), 1.44 (m, 2), 1.60 (m, 4), 2.70 (m, 6), 3.46 (m, 2), 3.58 (quint, 2), 4.35 (d, 2), 6.95 (t, 1), 7.38 (dd, 1), 7.54 (d, 2), 7.74 (dt, 1), 8.27 (d, 2), 8.47 (m, 1), 8.55 (d, 1), 8.72 (m, 3), 9.11 (s, 1).
5.0 g (24.92 mm) of 6-chloro-2-(ethylamino)nicotinic acid (Ex. 1.1) are dissolved in 300 ml of THF in a round-bottomed flask. 10.41 ml (74.77 mm) of triethylamine, then 7.08 ml (49.84 mm) of 1-(2-aminoethyl)piperidine and subsequently 11.02 g (24.92 mm) of BOP are added. The mixture is stirred at ambient temperature for 15 h. The solvent is evaporated and the residue is taken up in ethyl acetate. The organic phase is washed with water and then a saturated NaCl solution. It is dried over Na2SO4, filtered and evaporated. The residue is purified by flash chromatography (gradient CH2Cl2-MeOH 1 to 10%). 7.5 g (yd: 96.8%) are obtained (LC/MS; MH+ 311, tr=1.01 min).
6.0 g (19.3 mm) of the compound obtained in stage 12.1, 4.65 g (21.23 mm) of 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)aniline, 400 ml of DME, 60 ml of ethanol and 250 ml of a saturated NaHCO3 solution are placed in a three-necked flask under an argon atmosphere. The mixture is degassed for 30 min and then 2.23 g (1.93 mm) of Pd(PPh3)4 are added. The mixture is brought to reflux for 10 h. The solvents are evaporated and the residue is taken up in CH2Cl2. The organic phase is washed with water and then a saturated NaCl solution. The organic phase is dried over Na2SO4, filtered and evaporated. The residue is purified by flash chromatography (gradient CH2Cl2-MeOH 1 to 15%). 6.4 g (yd: 90.2%) are obtained (LC/MS; MH+ 368, tr=0.65 min).
0.8 g (2.18 mm) of the compound obtained in stage 12.2 are placed in 80 ml of THF in a round-bottomed flask. 0.67 g (2.61 mm) of DSC and 0.319 g (2.61 mm) of DMAP are added. The mixture is stirred at ambient temperature for 18 h. 0.91 ml (6.53 mm) of triethylamine and 0.583 g (2.61 mm) of (5-(aminomethyl)pyridin-2-yl)carbamic acid tert-butyl ester are subsequently added and the mixture is stirred at ambient temperature for 15 h. The solvents are evaporated and filtration is carried out. Purification is carried out by flash chromatography (gradient CH2Cl2-MeOH 1 to 20%). 1 g (yd: 74.5%) is obtained. (LC/MS; MH+ 617, tr=6.6 min).
0.8 g (1.3 mm) of the compound obtained in stage 12.3 is dissolved in 20 ml of CH2Cl2. 11.35 ml (45.4 mm) of a 4M solution of HCl in dioxane are added. The mixture is stirred at ambient temperature for 18 h. It is concentrated. The residue is taken up in an Na2CO3 solution, filtered and washed with water. It is dried under vacuum over P2O5. 0.38 g (yd: 53%) is obtained. LC/MS; MH+ 517, tr=4.94 min. 1H NMR (250 MHz, d6-DMSO) δ ppm: 1.21 (t, 3H), 1.29-1.61 (m, 6H), 2.32-2.47 (m, 6H), 3.24-3.39 (m, 2H), 3.44-3.58 (m, 2H), 4.10 (d, 2H), 5.84 (s, 2H), 6.42 (d, 1H), 6.51 (t, 1H), 7.09 (d, 1H), 7.35 (d, 1H), 7.50 (d, 2H), 7.87 (s, 1H), 7.94 (d, 1H), 8.01 (d, 2H), 8.35 (t, 1H), 8.42 (t, 1H), 8.71 (s, 1H).
1H NMR (d6-DMSO, 400 MHz): δ 1.22 (t, 3), 3.25 (t, 2), 3.30-3.48 (unresolved peak, 8), 3.54 (q, 2), 3.58 (t, 2), 4.47 (d, 2), 7.12 (d, 1), 7.18 (t, 1), 7.53 (d, 2), 7.86 (dd, 1), 7.98 (d, 1), 8.02 (d, 2), 8.29 (d, 1), 8.41 (unresolved peak, 2), 8.63 (t, 1), 8.74 (d, 1), 8.78 (s, 1), 9.22 (s, 1), 9.27 (unresolved peak, 3).
1H NMR, d6-DMSO (300 MHz) δ 0.24 (m, 2H), 0.45 (m, 2H), 1.06 (m, 1H), 2.73 (d, J=4.1 Hz, 3H), 3.35 (t, J=6.1 Hz, 2H), 4.31 (d, J=5.1 Hz, 2H), 6.76 (t, J=6.0 Hz, 1H), 7.05 (d, J=8.0 Hz, 1H), 7.33 (t, J=5.2 Hz, 1H), 7.48 (d, J=8.6 Hz, 2H), 7.69 (d, J=7.8 Hz, 1H), 7.90 (d, J=8.1 Hz, 1H), 7.97 (d, J=8.6 Hz, 2H), 8.36 (m, 1H), 8.43 (m, 1H), 8.51 (m, 1H), 8.58 (t, J=5.1 Hz, 1H), 8.82 (s, 1H).
1H NMR, d6-DMSO (300 MHz) δ 1.85 (m, 4H), 2.72 (d, J=4.6 Hz, 3H), 3.40 (m, 4H), 4.32 (d, J=5.8 Hz, 2H), 6.74 (t, J=5.9 Hz, 1H), 7.08 (d, J=7.7 Hz, 1H), 7.32-7.37 (m, 1H), 7.49 (m, 3H), 7.70 (m, 1H), 7.95 (d, J=8.8 Hz, 2H), 8.16 (m, 1H), 8.44 (m, 1H), 8.52 (m, 1H), 8.78 (s, 1H).
1H NMR, d6-DMSO (300 MHz) δ 1.59-1.63 (m, 1H), 1.80-1.93 (m, 3H), 2.74 (d, J=4.4 Hz, 3H), 3.52-3.56 (m, 1H), 3.63-3.69 (m, 2H), 3.75-3.85 (m, 1H), 4.03-4.06 (m, 1H), 4.33 (d, J=5.8 Hz, 2H), 6.76 (t, J=6.0 Hz, 1H), 7.08 (d, J=8.1 Hz, 1H), 7.33-7.38 (m, 1H), 7.50 (d, J=8.8 Hz, 2H), 7.69-7.73 (m, 1H), 7.92 (d, J=8.1 Hz, 1H), 7.99 (d, J=8.8 Hz, 2H), 8.37 (m, 1H), 8.45 (m, 1H), 8.53 (m, 1H), 8.66 (t, J=5.3 Hz, 1H), 8.83 (s, 1H).
1H NMR, d6-DMSO (300 MHz) δ 2.75 (d, J=4.3 Hz, 3H), 3.31 (s, 3H), 3.55 (t, J=5.2 Hz, 2H), 3.68 (m, 2H), 4.35 (d, J=5.7 Hz, 2H), 6.78 (t, J=5.7 Hz, 1H), 7.10 (d, J=8.1 Hz, 1H), 7.35-7.39 (m, 1H), 7.51 (d, J=8.7 Hz, 2H), 7.73 (m, 1H), 7.94 (d, J=8.1 Hz, 1H), 8.00 (d, J=8.7 Hz, 2H), 8.39 (m, 1H), 8.47 (m, 1H), 8.54 (m, 1H), 8.62 (t, J=5.0 Hz, 1H), 8.84 (s, 1H).
1H NMR, d6-DMSO (300 MHz) δ 2.74 (d, J=4.4 Hz, 3H), 3.55-3.62 (m, 4H), 4.33 (d, J=5.8 Hz, 2H), 4.77 (t, J=4.9 Hz, 1H), 6.78 (t, J=5.8 Hz, 1H), 7.07 (d, J=8.0 Hz, 1H), 7.34-7.39 (m, 1H), 7.50 (d, J=8.8 Hz, 2H), 7.71 (m, 1H), 7.91 (d, J=8.1 Hz, 1H), 7.99 (d, J=8.8 Hz, 2H), 8.38 (m, 1H), 8.45 (m, 1H), 8.53 (m, 1H), 8.61 (m, 1H), 8.85 (s, 1H).
1.19 ml (20.94 mmol) of ethylamine as a 70% aqueous solution, 0.7 g (5.24 mmol) of potassium carbonate, 0.066 g (1.05 mmol) of copper powder and 0.42 ml (5.24 mmol) of pyridine are added to a suspension in water (20 ml) of 2 g (10.47 mmol) of 2,4-dichlorobenzoic acid. The medium is heated at 130° C. for 5 h and then stirred at ambient temperature for 48 h. The reaction medium is filtered and then a 5N HCl solution is added until the compound has precipitated. The product is filtered off and then dried in an oven in the presence of P2O5. 1.7 g (Yd=85%) of a white powder are obtained. LC/MS; MH+=200, tr=8.72 min (conditions: C).
0.85 ml (6.01 mmol) of 2-(piperidin-1-yl)ethylamine, 1.96 g (6.01 mmol) of BOP and 1.54 ml (15.02 mmol) of triethylamine are added to a solution of 1 g (5.01 mmol) of 4-chloro-2-(ethylamino)benzoic acid in THF (20 ml). The mixture is stirred at ambient temperature for 12 h. The solvent is evaporated under reduced pressure. The residue is taken up in dichloromethane and washed successively with water and a saturated NaCl solution, and then the organic phase is dried on sodium sulphate. The residue is purified by flash chromatography (gradient: CH2Cl2 100% to CH2Cl2/MeOH 90%/10%). 1.4 g (Yd=90%) of a white solid are obtained. LC/MS; MH+=310, tr=4.33 min (conditions: A).
0.68 g (1.45 mmol) of 2-(5-{3-[4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]-ureidomethyl}pyridin-2-yl)carbamic acid tert-butyl ester and 0.26 g (6.01 mmol) of potassium carbonate are added to a solution of 0.3 g (0.97 mmol) of 4-chloro-2-ethylamino-N-(2-(piperidin-1-yl)ethyl)benzamide in a toluene/water mixture (18/2 ml). The medium is stirred at ambient temperature and under argon for 30 min and then 0.034 g (0.05 mmol) of bis(di(tert-butyl)(4-dimethylaminophenyl)phospine)dichloropalladium(II) is added. The reaction medium is stirred at reflux and under argon for 5 h. The solvent is evaporated under reduced pressure. The residue is taken up in dichloromethane and successively washed with water and a saturated NaCl solution, and then the organic phase is dried over sodium sulphate. The residue is purified by flash chromatography (gradient: CH2Cl2 100% to CH2Cl2/MeOH 80%/20%). 0.31 g (Yd=52%) of a yellow solid is obtained. LC/MS; MH+=616, tr=4.13 min (conditions: A).
0.59 g (16.24 mmol) of a solution of hydrochloric acid in ether is added to a solution in dichloromethane (15 ml) of 0.2 g (0.32 mmol) of (5-{3-[3′-ethylamino-4′-(2-(piperidin-1-yl)-ethylcarbamoyl)biphenyl-4-yl]ureidomethyl}pyridin-2-yl)carbamic acid tert-butyl ester. The medium is stirred at ambient temperature for 2 h. The solvent is evaporated under reduced pressure. The residue is taken up in dichloromethane and successively washed with a saturated K2CO3 solution, water and a saturated NaCl solution, and then the organic phase is dried over sodium sulphate. The organic phases are combined and then the solvents are evaporated under reduced pressure. 0.1 g (Yd=45%) of a yellow solid is obtained. LC/MS; MH+=516, tr=6.43 min (conditions: C). 1H NMR (400 MHz, d6-DMSO) δ ppm 1.23 (t, 3H), 1.34-1.78 (m, 6H), 2.47-3.07 (m, 6H), 3.17-3.27 (m, 2H), 3.40-3.56 (m, 2H), 4.11 (d, 2 H), 5.82 (s, 2H), 6.43 (d, 1H), 6.55 (t, 1H), 6.78-6.85 (m, 2H), 7.34 (d, 1H), 7.49 (d, 2H), 7.58 (d, 2H), 7.63 (d, 1H), 7.82-7.94 (m, 2H), 8.37 (br. s., 1H), 8.74 (s, 1H).
The compounds in Table I have as chemical name (obtained from the Autonom® software):
The compounds described in Table I have formed the subject of pharmacological trials which make it possible to determine the anticancer activity. They were tested in vitro on the following tumour lines: HCT116 (ATCC-CCL247) and PC3 (ATCC-CRL1435). The cell proliferation and 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 to convert MTS to a coloured compound after incubating the test compound for 72 hours is measured. The concentration of compound which results in 50% loss of cell proliferation and viability is recorded as IC50.
For the compounds in Table I, an IC50<10 000 nM (10 μM) is found with regard to the HCT116 and PC3 lines. It is observed that some of the compounds exhibit an IC50 value of <500 nM, some being very active with an IC50 of 0.1 nM (cf. values in Table II). Thus, the compounds result in a loss of proliferation and viability of the tumour cells and therefore have an anticancer activity.
| Number | Date | Country | Kind |
|---|---|---|---|
| 0706799 | Sep 2007 | FR | national |
| Number | Date | Country | |
|---|---|---|---|
| Parent | PCT/FR2008/001338 | Sep 2008 | US |
| Child | 12732749 | US |
