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  • C07D487/04—Ortho-condensed systems

Definitions

• the present invention relates to triazolopyridine-carboxamide and triazolopyrimidine-carboxamide derivatives, to their preparation and to their therapeutic application.
• a and X represent, independently of one another, a nitrogen atom or a CH group
• R 1 represents an aryl or heteroaryl group optionally substituted by one or more groups selected from a halogen atom, a (C -, - C 6) alkyl, halo (Ci-C 6) alky e, (C r C 6! ) alkoxy, halo (C r C 6) alkoxy,
• R 2 represents an aryl group, optionally substituted with one or more groups selected from a halogen atom, a methyl group, trifluoromethyl, methoxy, trifluoromethoxy.
• the compounds of formula (I) may comprise one or more asymmetric carbon atoms. They can therefore exist as enantiomers or diastereoisomers. These enantiomers, diastereoisomers, as well as their mixtures, including the racemic mixtures, form part of the invention.
• the compounds of formula (I) may exist in the form of bases or addition salts with acids. Such addition salts are part of the invention.
• salts can be prepared with pharmaceutically acceptable acids, but the salts of other acids that are useful, for example, for the purification or the isolation of the compounds of formula (I) are also part of the invention.
• the compounds of formula (I) may also exist in the form of hydrates or solvates, namely in the form of associations or combinations with one or more water molecules or with a solvent. Such hydrates and solvates are also part of the invention.
• Ci -3 can characterize a carbon chain having from 1 to 3 carbon atoms ;
• halogen atom a fluorine, a chlorine, a bromine or an iodine
• alkyl group a saturated linear or branched aliphatic group.
• alkyl group a saturated linear or branched aliphatic group.
• haloalkyl group an alkyl group in which one or more hydrogen atoms have been substituted by a fluorine atom;
• an alkoxy group an -O-alkyl radical in which the alkyl group is as previously defined;
• a haloalkoxy group an alkoxy group in which one or more hydrogen atoms have been substituted with a halogen atom;
• aryl group a cyclic aromatic group comprising between 5 and 14 carbon atoms.
• aryl groups mention may be made of phenyl or naphthyl;
• heteroaryl group an aromatic heterocyclic group comprising either 5 or 6 carbon atoms and comprising from 1 to 4 heteroatoms, such as nitrogen, oxygen or sulfur.
• heteroaryl groups mention may be made of pyrrole, furan, thiophene, pyrazole, imidazole, triazole, tetrazole, oxazole, isoxazole, oxadiazole, thiazole, isothiazole, thiadiazole, pyridine, pyrimidine, pyrazine, pyridazine and triazine.
• a first group of compounds consists of the compounds for which:
• A represents a nitrogen atom
• X represents a CH group.
• a second group of compounds consists of the compounds for which:
• Ft 1 represents an aryl or heteroaryl group optionally substituted by one or more groups selected from a halogen atom, a (C 1 - C 6) alkyl, halo (CrC 6) alkyl, (C-rC ⁇ Jalcoxy, halo (C r C 6 ) alkoxy,
• a third group of compounds consists of the compounds for which:
• R 1 represents a phenyl, furan, thiophene or naphthalene group, optionally substituted by a halogen atom.
• a protective group Pg is understood to mean a group that makes it possible, on the one hand, to protect a reactive function such as a hydroxyl or an amine during a synthesis and, on the other hand, to regenerate the intact reactive function. at the end of synthesis.
• Examples of protecting groups and methods of protection and deprotection are given in "Protective Groups in Organic Synthesis", Green et al., 2nd Edition (John Wiley & Sons, Inc., New York), 1991.
• leaving group is meant, in what follows, a group that can be easily cleaved from a molecule by breaking a heterolytic bond, with departure from an electronic pair. This group can thus be easily replaced by another group during a substitution reaction, for example.
• Such leaving groups are, for example, halogens or an activated hydroxy group such as methanesulfonate, benzenesulfonate, p-toluenesulfonate, triflate, acetate, etc. Examples of leaving groups as well as references for their preparation are given in Advances in Organic Chemistry, J. March, 3 rd Edition, Wiley Interscience, 1985, p. 310-316.
• the compounds of general formula (I) can be prepared according to the process illustrated in the following scheme 1.
• the compounds of general formula (II), in which X is as defined above, are converted into compounds of general formula (III) in which X and R 1 are such that defined above.
• the transformation is carried out by a coupling reaction with a boronic acid or a boronate of the respective general formulas (IV) or (V), in which R 1 is as defined above, and (OR ") 2 represents a pinacol group, catalyzed by a palladium complex.
• the compounds of general formula (III), in which X and R 1 are as defined above, are converted into compounds of general formula (VI), in which R 1 , R 2, X and A are as defined above, by reaction with a carbamoyl chloride of general formula (VII).
• the reaction is carried out in a solvent such as N, N-dimethylformamide or N-methylpyrrolidone in the presence of a base such as sodium hydride or potassium tert-butoxide or ferf-pentoxide.
• the compounds of general formula (VI) are converted into compounds of general formula (VIII) in which R 2 , A, R 1 and X are as defined above, by reduction of a nitro group to an amino group.
• the reaction can be carried out by various methods described in the literature or known to those skilled in the art, such as, for example, hydrogenation in the presence of a catalyst based on palladium, platinum or nickel and their variants.
• the compounds of general formula are converted (VIII) to compounds of general formula (I) by a diazotization-cyclization reaction.
• the reaction can be carried out using a nitrite, for example sodium or potassium nitrite in an acid medium or isoamyl or tert-butyl nitrite, in solvents such as water or tetrahydrofuran or their mixture.
• a nitrite for example sodium or potassium nitrite in an acid medium or isoamyl or tert-butyl nitrite, in solvents such as water or tetrahydrofuran or their mixture.
• Lane B of Scheme 1 illustrates an alternative method for preparing the compounds of formula (I).
• the compounds of general formula (II) are converted into compounds of general formula (IX) by reaction with a carbamoyl chloride of general formula (VII), as defined above.
• the compounds of general formula (IX) are converted into compounds of general formula (VI) by a reaction with a boronic acid or a boronate of general formula (IV) or (V), as defined above.
• the compounds of general formula (II), (IV) and (V) are commercially available.
• the carbamoyl chlorides of general formula (VII), if they are not commercially available, may be prepared by any method described in the literature or known to those skilled in the art, for example from the corresponding amines by reaction. with phosgene, diphosgene or triphosgene.
• Lane A alternatively, 4- (3-trifluoromethyl-phenyl) -piperazine-1-carboxylic acid, [6- (4-chloro-phenyl) -3-nitro-pyridin-2-yl] -amide may be prepared as follows. Under a nitrogen atmosphere, 1 g (5.76 mmol) of 2-amino-6-chloro-3-nitro-pyridine, 1.26 g (8.07 mmol) of 4-chlorobenzeneboronic acid, 7.2 ml are mixed.
• step 1.1 This product is employed as in step 1.1 to obtain 4- (3-trifluoromethyl-phenyl) -piperazine-1-carboxylic acid, [6- (4-chloro-phenyl) -3-nitro-pyridin-2 yl] amide.
• Table 1 which follows illustrates the chemical structures and the physical properties of some examples of compounds according to the invention.
• Table 1 which follows illustrates the chemical structures and the physical properties of some examples of compounds according to the invention. In this table :
• Ph represents a phenyl group.
• the compounds according to the invention surprisingly exhibit an inhibitory effect on the MGL enzyme (monoacyl glycerol lipase).
• the MGL enzyme catalyzes the hydrolysis of endogenous derivatives of monoglyceride esters of different fatty acids (FEBS Letters 1998, 429, 152-156) and in particular the hydrolysis of 2-arachidonoylglycerol (2-AG) and 1 (3 ) -arachidonoylglycerol (1 (3) -AG) (J. Biol Chem 1987, 272 (48), 27218-27223, Proc Natl Acad Sci USA 2002, 99 (16), 10819-10824; Pharmacol 2004, 67, 1381-1387, Mol Pharmacol 2004, 66 (5), 1260-1264).
• the 2-AG and 1 (3) -AG derivatives in particular interact with the cannabinoid receptors (J. Biol Chem 1999, 274 (5), 2794-2801, J. Biol Chem 2000, 275 (1), 605-612, British J. Pharmacol 2001, 134, 664-672).
• the compounds of the invention block this degradation pathway and increase the tissue levels of these derivatives and in particular 2-AG and / or 1 (3) -AG. As such, they can be used in the prevention and treatment of pathologies in which 2-AG and / or 1 (3) -AG in particular and / or any other substrate metabolized by the MGL enzyme (Progress) are involved. Lipid Research 2006, 45, 405-446).
• the compounds according to the invention may also have an additional inhibitory effect on the enzyme FAAH (Fatty Acid Amide Hydrolase).
• the enzyme FAAH (Chemistry and Physics of Lipids, (2000), 108, 107-121) catalyzes the hydrolysis of endogenous derivatives of amides and esters of different fatty acids such as ⁇ / -arachidonoylethanolamine (anandamide), ⁇ -palmitoylethanolamine, ⁇ -O-triethanolamine or oleamide. These derivatives exert different pharmacological activities by interacting, inter alia, with the cannabinoid and vanilloid receptors.
• the compounds of the invention block this pathway of degradation and increase the tissue level of these endogenous substances. They can be used as such in the prevention and treatment of pathologies in which the endogenous cannabinoids and / or any other substrate metabolized by the enzyme FAAH, are involved. Trials consisted of measuring the in vitro activity of the compounds of the invention on the MGL enzyme.
• Inhibitory activity was measured in a radioenzyme assay based on the measurement of the hydrolysis product of 2-Oleoyl Glycerol ([ 3 H] 2-OG) by MGL.
• the hydrolysis products of [ 3 H] 2-OG, labeled on glycerol, are oleic acid and [ 3 H] glycerol and the MGL enzyme source is a mouse brain homogenate where the cerebellum and the spinal bulb have been eliminated.
• the mouse brains are removed, stored at -80 ° C.
• the dilution range of the compounds is made from stock solutions at 20 mM in 100% DMSO.
• the first dilution of this range is carried out in 100% DMSO then the second in the enzyme reaction buffer (50 mM phosphate, 0.1% BSA) resulting in the achievement of a concentration range 10 times concentrated.
• the test compounds are preincubated at the selected concentration for 20 minutes with the mouse brain homogenate preparation.
• the final concentration of DMSO in the enzymatic reaction does not exceed 0.1%.
• the assay of the MGL activity is carried out in a 96-well microplate in a final reaction volume of 100 ⁇ l. Briefly, 75 ⁇ g of protein, preincubated with the test compounds, are diluted in 50 mM phosphate buffer containing 0.1% BSA and incubated for 20 minutes at room temperature, in the presence of 50 ⁇ M of 2-OG containing amount of [ 3 H] 2-OG of 0.027 ⁇ Ci / well (specific activity of 20 Ci / mmol). The reaction is stopped and the products formed are separated by the addition and the mixture of 100 ⁇ l of chloroform / methanol (1/1).
• the microplate After stirring for 10 minutes, the microplate is centrifuged for 15 minutes at 4000 g and an aliquot of 30 ⁇ l of the aqueous phase containing the [ 3 H] glycerol product is removed and then counted for 5 minutes by liquid scintillation (Wallac 1450 Microbeta).
• the inhibitory activity against MGL is given by the concentration which inhibits 50% of the MGL activity.
• the most active compounds of the invention have a Cl 50 (concentration inhibiting 50% MGL control enzyme activity) of between 0.001 and 0.1 ⁇ M.
• Inhibitory activity was measured in a radioenzymatic assay based on the measurement of the hydrolysis product (ethanolamine [1-3H]) of anandamide by FAAH (Life Science (1995), 56, 1999-2005 and Journal of Pharmacology and Experimented Therapeutics (1997), 283, 729-734).
• the hydrolysis products of ethanolamine-labeled T [ 3 H] anandamide are arachidonic acid and T [ 3 H] ethanolamine and the enzyme source FAAH is a mouse brain homogenate where the cerebellum and the spinal bulb have been eliminated. The mouse brains are removed, stored at -80 ° C.
• the dilution range of the compounds is made from stock solutions at 20 mM in 100% DMSO.
• the first dilution of this range is carried out in 100% DMSO then the second in the enzyme reaction buffer (10 mM Tris-HCl, 15 mM NaCl, 1 mM EDTA (pH 8), 0.1% BSA) resulting in the production of concentration range 10 times concentrated.
• the test compounds are preincubated at the selected concentration for 20 minutes with the mouse brain homogenate preparation. The final concentration of DMSO in the enzymatic reaction does not exceed 0.1%.
• the assay of the FAAH activity is carried out in a 96-well microplate in a final reaction volume of 70 ⁇ L. Briefly, 200 ⁇ g of mouse brain homogenate, preincubated with the test compounds, are diluted in 10 mM Tris-HCl, NaCl. 15 mM, 1 mM EDTA (pH8) containing 0.1% BSA and incubated for 20 minutes at room temperature in the presence of 10 ⁇ M of anandamide containing a quantity of [ 3 H] -anandamide of 0.01 ⁇ Ci / well ( Specific activity of 60 Ci / mmole). The reaction is stopped and the products formed are separated by the addition and the mixture of 140 ⁇ l of chloroform / methanol (2/1).
• the microplate After 10 minutes After stirring, the microplate is centrifuged for 15 minutes at 4000 g and an aliquot of 30 ⁇ l of the aqueous phase containing P [ 3 H] ethanolamine produced is taken and then counted for 5 minutes by liquid scintillation (Wallac 1450 Microbeta).
• the most active compounds of the invention have a Cl 50 (50% concentration inhibiting the enzymatic activity controlling FAAH) of between 0.001 and 0.1 ⁇ M.
• Cl 50 50% concentration inhibiting the enzymatic activity controlling FAAH
• compound No. 3 showed a Cl 50 of 0.002 ⁇ M.
• the compounds according to the invention have a selective inhibitory activity with respect to MGL or mixed with respect to MGL and FAAH.
• the compounds according to the invention can therefore be used for the preparation of medicaments, in particular drugs which inhibit the MGL enzyme or the MGL and FAAH enzymes.
• the subject of the invention is medicaments which comprise a compound of formula (I), or an addition salt thereof to a pharmaceutically acceptable acid, or a hydrate or a solvate of compound of formula (I).
• These drugs find their therapeutic use, particularly in the treatment and prevention of: pain including acute or chronic pain of neurogenic type: migraine, neuropathic pain including forms associated with the herpes virus and diabetes; acute or chronic pain associated with inflammatory diseases: arthritis, rheumatoid arthritis, osteoarthritis, spondylitis, gout, vasculitis, Crohn's disease, irritable bowel syndrome; acute or chronic peripheral pain; dizziness, vomiting, nausea especially those following chemotherapy; eating disorders, particularly anorexia and cachexia of various natures; metabolic syndrome and its manifestations, including obesity; dyslipidemias and their manifestations, including atherosclerosis and coronary heart disease; neurological and psychiatric pathologies: tremor, dyskinesia, dystonia, spasticity, compulsive and obsessive behavior, Tourette's syndrome, all forms of depression and anxiety of all kinds and origins, mood disorders, psychoses; acute and chronic neuro-degenerative diseases: Parkinson's disease, Alzheimer's disease, senile dementia
• Epilepsy sleep disorders including sleep apnea; cardiovascular diseases especially hypertension, cardiac arrhythmias, arteriosclerosis, heart attack, ischemic heart disease; renal ischemia; cancers: benign tumors of the skin, papillomas and brain tumors, prostate tumors, brain tumors (glioblastomas, medulloepitheliomas, medulloblastomas, neuroblastomas, embryonic origin tumors, astrocytomas, astroblastomas, ependyomas, oligodendrogliomas, plexus tumors, neuroepitheliomas, epiphysis tumor, ependymoblastomas, malignant meningiomas, sarcomatoses, malignant melanomas, schwénnomes); disorders of the immune system, including autoimmune diseases: psoriasis, lupus erythematosus, connective tissue diseases or connective tissue diseases, Sjögren's syndrome, ankylosing spond
• the present invention relates to pharmaceutical compositions comprising, as active principle, a compound according to the invention.
• These pharmaceutical compositions contain an effective dose of at least one compound according to the invention, or a pharmaceutically acceptable salt, a hydrate or solvate of said compound, as well as at least one pharmaceutically acceptable excipient.
• Said excipients are chosen according to the pharmaceutical form and the desired mode of administration, from the usual excipients which are known to those skilled in the art.
• compositions of the present invention for oral, sublingual, subcutaneous, intramuscular, infra-venous, topical, local, intratracheal, intranasal, transdermal or rectal administration the active ingredient of formula (I) above, or its salt, solvate or hydrate, may be administered in unit dosage form, in admixture with conventional pharmaceutical excipients, to animals and humans for the prophylaxis or treatment of the above disorders or diseases.
• Suitable unit dosage forms include oral forms such as tablets, soft or hard capsules, powders, granules and oral solutions or suspensions, sublingual, oral, intratracheal, intraocular, intranasal forms of administration. by inhalation, topical, transdermal, subcutaneous, intramuscular or intravenous administration forms, rectal administration forms and implants.
• the compounds according to the invention can be used in creams, gels, ointments or lotions.
• a unitary form of administration of a compound according to the invention in tablet form may comprise the following components: Compound according to the invention 50.0 mg
• the present invention also relates to a method of 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 hydrates or solvates.

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