EP1390348A1

EP1390348A1 - 5-cyano-1h-indole derivatives as antagonists of the interleukine-8 receptors

Info

Publication number: EP1390348A1
Application number: EP02738246A
Authority: EP
Inventors: Martine Barth; Pierre Dodey; Jean-Luc Paquet
Original assignee: Laboratories Fournier SAS
Current assignee: Laboratories Fournier SAS
Priority date: 2001-05-17
Filing date: 2002-05-16
Publication date: 2004-02-25
Also published as: CZ20032260A3; JP2004534034A; CA2447184A1; KR20030094255A; BR0207438A; WO2002092568A1; CN1496348A; US20050100902A1; FR2824826B1; FR2824826A1

Abstract

The invention concerns 5-cyano-<i>1H</i>-indole derivatives of formula (I), wherein: R>1<, R>2<, X and n are such as defined in Claim 1, as well as their pharmaceutically acceptable salts, solvates, and hydrates. The invention also concerns pharmaceutical compositions containing them, and their use for preparing medicines for preventive or curative treatment of diseases mediated by the activation of the CXCR2 receptor of interleukine-8 and chemokines of the same family.

Description

5-CYANO-1H-INDOLE DERIVATIVES OF ANTAGONIST RECEPTORS

Interleukin-8

The present invention relates to new derivatives of 5-cyano-iH-indole, the pharmaceutical compositions containing them, as well as their use for the preparation of medicaments intended for treating diseases dependent on the interleukin-8 receptor.

IL-8 (Interleukin-8) is a protein of 72 amino acids belonging to the superfamily of proteins capable of attracting leukocytes, also qualified as CXC or CC cytokines intercrine cytokines or more recently chemokines (Oppenheim et al, Annu Rey Immunol, 1991, 9, 617-648). Different names have been assigned to interleukin-8 such as NAP-1 (from English "neutrophil activating peptide-1"), NAF (from English "neutrophil activating factor") and "T-cell lymphocyte chemotactic factor ". Many members of the chemokine family have been described to be involved in inflammatory processes and the migration of leukocytes. The family of chemokines is made up of two distinct sub-families: alpha- and beta-chemokines. Alpha-chemokines, such as IL-8, NAP-2 (from the English "Neutrophil activating peptide-2"), MGSA / Gro, or Gro-alpha (from the English "melanoma growth stimulatory activity" ), and ENA-78 (from the English "Epithelial cell derived neutrophil activating protein 78"), all have effects on the attraction and activation of leukocytes and more particularly neutrophils. This subfamily also includes PF-4 (from English "Platelet Factor-4"), beta-thromboglobulin and CTAPII (from English "connective tissue activating protein ÏÏI"), which do not have effect on neutrophils.

IL-8 was originally identified by its ability to attract and activate polymorphonuclear leukocytes (neutrophils). More recently, it has been shown that dTL-8 expression is rapidly induced in different tissues or cells such as macrophages, fibroblasts, endothelial and epithelial cells and even neutrophils, in response to pro-inflammatory cytokines such as IL-l alpha or beta or TNF alpha (from the English "Tumor necrosis factor") or other pro-inflammatory agents such as LPS (from the English "Lipopolysacharid") (Nan Damme J., Interleukin-8 and related chemotactic cytokines; 1994; The Cytokines Handbook, 2 ^nd Ed. AW Thomson editor, Académie Press, London, pp: 185-208). In addition, some data in the literature have demonstrated elevated systemic levels of IL-8 in certain inflammatory pathologies involving neutrophils, suggesting that IL-8 and other chemokines of the same family may; be fundamental mediators of neutrophil activation (Nan Damme, Interleukin- 8 and related chemotactic cytokines; 1994; 77îe Cytokines Handbook, 3 ^rd Ed. AW Thomson publisher, Académie Press, London, pp: 271-311).

Gro-alpha, Gro-beta, Gro-gamma and ΝAP-2 belong to the family of chemokines and, like IL-8, these proteins have also been called by different terms. So, Gro-alpha, beta and gamma! were called respectively MGSA (from the English "Melanoma Growth Stimulatory Activity") a, b and g (Richmond and Thomas, J. Cell Physiol, 1986, 129, 375-384; Cheng et al, J. Immunol., 1992 , 148, 451-456). All these chemokines belong to the group of alpha-chemokines which have an ELR motif (Aspartate-Leucine-Arginate) upstream of the characteristic CXC motif; this subgroup. These chemokines all bind to the type 2 receptor or CXCR2. ^•

Two 1TL-8 receptors belonging to the family of receptors with seven trans-membrane domains coupled to G proteins have been characterized and cloned: the IL-8 type A receptor (IL-8RA) or CXCR1 which binds with a strong affinity IL-8 and GCP-2 (from the English “granulocyte chemoattractant protein 2,”), and the 1TL-8 type B receptor (TL-8RB) or CXCR2 which has specific ligands IL-8, GCP-2, Gro-alpha, Gro-beta, Gro-gamma and NAP-2 (Pon'ath, Exp. Opin. Invest. Drugs, 1998, 7, 1-18). These two receptors have an amino acid sequence homology of 77%. Numerous publications have documented abnormally high levels of IL-8 in rheumatoid arthritis, septic shock, asthma, cystic fibrosis, myocardial infarction, and psoriasis (Baggiolini et al, FEBS Lett., 1992, 307, 97-101; Mille and Krangel, Crit. Rev. Immunol., 1992, 12, 17-46; Oppenheim et al, Annu. Rev. Immunol, 1991; 9, 617-648; Seitz et al, J Clin. Invest., 1991, 87, 463-469; Miller et al, km. Rev. Resp. Dis., 1992, 146, 427-432; Donnelly et al, Lancet, 1993, 341, 643-647). LTL-8 seems to be involved in the phenomena of ischemia-reperfusion; lung (Sekido et al, Nature, 1993, 365, 654-657). An antibody directed against IL-8 having the capacity to block the in vitro migration of rabbit neutrophils induced by IL-8, prevents tissue damage resulting from a process of pulmonary ischemia / reperfusion in rabbits. IL-8 seems to play a major role in alterations due to myocardial hypoxia / reperfusion (Kukielka et al., J. Clin. Invest., 1995, 95, 89-103).

Another study has demonstrated the beneficial effects of an IL-8 neutralizing antibody in a model of endotoxin-induced pleurisy in rabbits (Broadus et al, J. Immunol, 1994, 152, 2960-2967) . The implication of TJL-8 in inflammations of the lung as well as its deleterious role have been demonstrated with the help of neutralizing antibodies to IL-8 in a d? pulmonary damage induced by an instillation of acid in the lungs of the rabbit (Folkesson et al, J. Clin. Invest., 1995, 96, 107-116) and in a model of acute respiratory distress syndrome induced by endotoxins (Yokoi et al, Lab. Invest., 1997, 76, 375-384). Other reports have shown similar beneficial effects with neutralizing antibodies to IL-8 in animal models of dermatosis, arthritis and glomerulonephritis (Akahoshi et al, Lymphokine and Cytokine Res., 1994, 13, 113- 116; Nishimura et al, J. Leukoc. Biol, 1997, 62, 444-449; Wada et al, J. Exp. Med., 1994, 180, 1135-1140). In addition, mice deficient in interleukin-8 receptors were generated by elimination of the gene coding for the murine IL-8 receptor homologous to the human type 2 receptor (CXCR2) (Cacalano et al, Science, 1994 , 265, 682-684). Although these mice are healthy, the characteristics of their neutrophils are modified. In fact, their capacity to migrate ^• into the peritoneum is reduced in response to an intraperitoneal injection of thioglycolate. All these results demonstrate that the chemokines of the IL-8 family are important mediators of the migration and activation of neutrophils and other cell types such as endothelial cells under certain inflammatory conditions. In addition, chemokines of the IL-8 family have been described as playing an important role in tumor growth, metastasis and tumor angiogenesis in many types of cancer (Hébert and Baker, Cancer Invest., 1993, 11, 743-750; Richards et al, Am. J. Surg., 1997, 174, 507-512).

Certain compounds capable of binding to TJ -8 receptors are described in the prior art: WO 96/18393, for example, discloses derivatives of lj-benzyl-2-indolecarboxylic acid, capable of binding to some TL-8 receptors with! an inhibitory effect. More recently, according to WO 99/06354, compounds derived from urea or thiourea have also been presented as IL-8 receptor antagonists.

Furthermore, the patent application published under the number WO 00/51984 discloses certain indole derivatives of formula (A):

useful as intermediates in the synthesis of tachykinin antagonists. However, it should be noted that no compound of formula (A) in which R ' _la or

R 'i _b represents a cyano group in position 5 is described. :

The invention provides new non-peptide compounds, derived from

5-cyano-1H-indole which have the property of binding to the CXCR2 receptor for] L-8 and other chemokines of the same family such as NAP-2, Gro-alpha or ENA-78 behaving as antagonists.

A subject of the present invention is therefore the new 5-cyano-iH-indole derivatives of formula (I):

in which :

- X represents a double bond -C = C- or a sulfur atom, - Rj and R represent, each independently of one another, a hydrogen atom, a halogen atom or a group (Cι-C ₃ ) alkyl, (C ₁ -C ₃ ) alkoxy, trifluoromethyl, trifluoromethoxy , cyano or nitro,

- n is equal to 2 or 3, as well as their pharmaceutically acceptable salts, solvates and hydrates.

By alkyl is meant a monovalent, hydrocarbon, saturated, linear or branched radical. ;

By (Cj-C ₃ ) alkyl is meant an alkyl radical comprising from 1 to 3 carbon atoms. i

By halogen atom is meant a fluorine, iodine, chlorine or chromium atom, fluorine and chlorine being preferred. <

Among the compounds of the invention, the currently preferred compounds ¹ are compounds of formula (Ia):

in which Ri, R ₂ and n are as defined for (I), as well as their pharmaceutically acceptable salts, solvates and hydrates. !

The compounds currently more particularly preferred are compounds of formula (Ib):

in which R _1s R ₂ and n are as defined for (I), as well as their pharmaceutically acceptable salts, solvates and hydrates.

The preferred compounds of formula (I), (la) and (Ib) are those for which Ri and R ₂ represent, each independently, a hydrogen, chlorine or fluorine or a group (Cι-C ₂ ) alkyl, methoxy, trifluoromethyl, trifluoromethoxy, cyano or nitro, n being equal to 2 or 3, as well as their pharmaceutically acceptable salts, solvates and jhydrates. ^'

Among the latter, the more preferred compounds are those for which R 1 and R ₂ represent, each independently, a hydrogen, chlorine or fluorine atom or a methyl group, n being equal to 2 or 3, as well as their salts, pharmaceutically acceptable solvates and hydrates. !

The compounds of formula (I), (la) and (Ib) which are very particularly preferred are those for which at least one of the following conditions is met: - n is equal to 3, and

- R] represents a chlorine or fluorine atom, as well as their pharmaceutically acceptable salts, solvates and hydrates.

The compounds of formula (I), (la) and (Ib) can be salified with a pharmaceutically acceptable mineral or organic base, according to techniques well known to those skilled in the art. The term “mineral base” includes hydroxides of alkali metals such as sodium hydroxide, potassium hydroxide, lithine, or alkaline earth metals such as lime. By organic base is meant primary, secondary or tertiary amines, amino alcohols, certain non-toxic nitrogen heterocycles, as well as their basic amino acids. Among the salts, the sodium or potassium salts are preferred, and the lysine, arginine or 2-amino-2-methyl-1,3-propanediol salts.

The compounds of formula (I) according to the invention are, for example, prepared according to SCHEME 1 below, in which Ri, R ₂ , X and n are as defined for (I), R ₃ represents a group ( Cj-C) alkyl, and Y represents a bromine or iodine atom. DIAGRAM 1

(I) The compounds of formula (I) can be prepared by hydrolysis of corresponding esters of formula:

in which Ri, R ₂ , X and n are as defined for (I) and R ₃ represents a (Cι-C ₄ ) alkyl group, in particular a methyl or ethyl group.

The compounds (II) are new intermediates and form an integral part of the invention.

The hydrolysis of the compounds (H) to acid (I) is carried out according to techniques well known to those skilled in the art, for example by the action of a (hydroalcoholic solution of sodium hydroxide.

The compounds of formula (H) can be prepared according to the following process: a) either by transformation of the compound of formula (m):

in which R _]; R ₂ , X and n are as defined for (I), R ₃ represents a (Cι-C ₄ ) alkyl group and Y represents a bromine or iodine atom, by the action of a cyanide, b) either by a Suzuki coupling between the bromine derivative of formula (V):

in which n is as defined for (I) and R represents a! (C] -C) alkyl group, and boronic acid of formula (2):

^R i li ^l B (OH) ₂ (2)

R ₂ in which R _1s R ₂ and X are as defined for (I), in the presence of a palladium catalyst such as tetrakis (triphenylphosphine) palladium.

In the step described in a), it is possible for example to act on the cuprous cyanide, in the presence of N-methyl-2-pyrrolidone. It is also possible to use potassium cyanide, in the presence of a palladium catalyst. In this case, one will operate, for example, in the presence of tetrakis (triphenylphosphine) palladium and copper iodide in a solvent such as tetrahydrofuran. !

The step described in b) is preferably carried out in the presence of lithium chloride and sodium carbonate.

The compounds of formula (m) are, for example, obtained by a Fischer reaction between the compound of formula (TV):

in which n, RR ₂ and X are as defined for (I), and R ₃ represents a (Cι-C ₄ ) alkyl group, with a phenylhydrazine of formula (1):

in which Y represents a bromine or iodine atom.

This Fischer reaction is carried out for example in the presence of zinc dichlprure in acetic acid, at a temperature between 20 and 80 ° C.

The compounds of formula (1) are commercial or obtained according to techniques well known to those skilled in the art. The compounds (IN) can be obtained for example: a) either by esterification, according to a reaction well known to man! in the art, by the action of alcohol R ₃ OH in which R ₃ represents a; (Cι-C) alkyl group, on the acid of formula:

in which Rj, R ₂ , X and n are as defined for (I), said acid (3) being obtainable by a Friedel and Craft type reaction between a cyclic diacid anhydride of formula:

in which n is as defined for (I), with a compound of formula t

wherein Rj, R and X are as defined for (I), in the presence of a Lewis acid; one could for example operate in the presence of aluminum trichloride in a solvent such as dichloromethane, b) either directly by a Friedel and Craft type reaction between an acid chloride of formula:

Cl-C (O) (CH ₂ ) _{n +} COOR ₃ (6) in which n is as defined for (I) and R ₃ represents a (C] -C) alkyl group, with the compound of formula (5) , in the presence of a Lewis acid, such as for example aluminum trichloride. The compounds of formula (V) can be prepared by bromination, for example by action of N-bromosuccinimide, of the compound of formula (VI): in which n is as defined for (I) and R ₃ represents a (CrC) alkyl group. î

The compounds of formula (VI) are, for example, prepared from the halogen derivative of formula:

in which Y represents a bromine or iodine atom, preferably iodine, by the action of a cyanide such as potassium cyanide, in the presence of a palladium catalyst. One will operate, for example, in the presence of tetrakis (triphenylphosphine) palladium and copper iodide in a solvent such as tetrahydrofuran. jj The compounds (VU) can be prepared according to a method analogous to that used for the preparation of the compounds (UJ), namely a Fiscjher reaction between a hydrazine (1) and an aldehyde of formula: HC (O) (CH ₂ ) _{n +} ι-COOR ₃ ; (7) in which n is as defined for (I) and R ₃ represents a (Cι-C ₄ ) alkyl group. The boronic acids used (2) are commercial or known compounds.

The compounds of formula (I) according to the invention have been the subject of biological studies. Their inhibitory effect on the chemokines JL-8 and Gro-alpha was determined by the following in vitro tests:

A) Test for binding to human PIL-8 receptors LTL-8 labeled with iodine 125 ([ ¹²⁵ I] -IL-8) (NEN, Les Ulis) has a specific activity close to 2,200 Ci / mmol. The recombinant human CXCR2 receptor was expressed in HEK 293 (ATCC, CRL-157β), K-562 (ATCC, CCL-243) or THP-1 (ATCC, TIB-202) cells. HEK 293 cells are maintained in culture in DMEM medium (from the English “Dulbecco modified eagle's medium”) (GH3CO) containing 4.5 g / 1 of glucose, 10% of fetal calf serum, 1% of Glutamax, 1% of non-essential amino acids, 1 mM of! sodium pyruvate, 100 IU / ml of penicillin and 100 μg / ml of streptomycin. K-562 and THP-1 cells are kept in culture in RPMI1640 medium (GL3CO) containing 10% fetal calf serum, 1% non-essential amino acids, 1 mM sodium pyruvate, 100 IU ml of penicillin and 100 μg / ml streptomycin. The cells are used when the cultures have reached 80% confluence.

The membranes are prepared according to the protocol previously described (Bastian et al, Br. J. Pharmacol. 1997, 122, 393-399) except the homogenization buffer which has been replaced by a saline solution buffered to pH 8.0 containing 20 mM Tris (tris (hydroxymethyl) aminomethane), 1.2 mM MgSO (magnesium sulfate), 0.1 mM EDTA (ethylenediaminetetraacetic acid) and 25 'mM NaCl (sodium chloride). The competition experiments are carried out in 96-well plates of 1 ml, at room temperature, in a final volume of 10.25 ml. i

The membranes diluted in a 20 mM solution of Bis-Trispropahe and

!

0.4 mM Tris-HCl buffered to pH 8.0 containing 1.2 mM MgSO _4, 10, l mM EDTA 25 mM NaCl and 0.03% CHAPS (3 - [(cholamidopropyl) - dimethylammonio ] -l-propanesulfonate) are incubated with decreasing concentrations of the test compound (from 100 μM to 0.01 nM) and 150 μM of [ ¹²⁵ I] -IL-8. Non-specific binding is determined in the presence of 300 nM unlabeled IL-8. After 60 minutes of incubation at room temperature, the reaction is stopped by rapid filtration under vacuum on a Whatman GF / C filter previously incubated for 1 hour at + 4 ° C. in a solution of 1% polyethyleneimine (weight / volume) and of SAB. (from English “bovine albumin serum”) 0.5% (weight / volume). The filters are washed with a solution containing 25 mM NaCl, 1 mM MgSO ₄ , 0.5 mM EDTA and 10 mM Tris-HCl buffered to pH 7.4. The radioactivity retained on the filters is measured in a gamma counter. j

The affinities of the compounds described in the present invention were also determined by a whole cell binding test. The transfected THP-1 or K-562 cells are suspended in the! PBS binding test buffer (of “buffered saline phosphate”) without calcium or magnesium containing 0.5% BSA (weight / volume), pH 7.4 at 2.5 x 10 ⁶ cells / ml. The competition experiments are carried out in 1-well 96-well plates in a final volume of 0.25 ml. 0.5 x 10 ⁶ cells are incubated with decreasing concentrations of the test compound (100 μM at 0.01 nM) and 150 μM of [ ¹²⁵ I] -IL-8. Non-specific binding is determined in the presence of 300 nM of non-radionuclear chemokine. After 90 minutes of incubation at + 4 ° C., the reaction is stopped by rapid filtration under vacuum on a Whatman GF / C filter previously incubated for 1 hour in a 3% polyethyleneimine solution (weight / volume). The filters are washed with a PBS solution at pH 7.4 containing 0.5 M NaCl. The radioactivity contained in the filters is measured in a gamma counter.

The compounds of formula (I) described in the present invention tested at a concentration of 10 μM inhibit by at least 95% the binding of [ ¹²⁵ I] -TL-8 to the CXCR2 receptor. B) Measurement of calcium fluxes

The effects of the compounds of the present invention were evaluated on! the calcium fluxes induced by IL-8 or Gro-alpha.

THP-1 cells expressing the recombinant CXCR2 receptors, U937 cells differentiated with DMSO (dimethyl sulfoxide) at 1% (volume / volume) or Eol3 cells are incubated in the presence of a fluorescent indicator, Fura-2 AM, at a concentration of 5 μM for 1 hour at 37 ° C. After this loading period, the cells are washed and suspended at the concentration of 1 × 10 ⁶ cells / ml in a saline solution containing: 136 mM NaCl, 4.7 nM KC1, 1.2 mM MgSO ₄ , 1.6 mM CaCl ₂ , 1.2 mM KH ₂ PO ₄ , 11 mM glucose, 5 mM HEPES (N- [2-hydroxyethyl] piperazine-N '- [2-ethanesulfonic acid]), pH 7.4. The cell suspension (2 ml) is placed in a quartz tank and the fluorescence intensity at 510 nm is measured, on a spectrofluorimeter of the LS50B type (Perkin-El er) after excitations alternately at 340 nm and 380 nm. The ratio of fluorescence intensities after excitation at 340 nm and 380 nm is determined and the intracellular calcium concentration [Ca ²⁺ ] i is calculated according to the formula: [Ca ²⁺ ] i = Ka (R-Rmin (Sf2 / Sb2)

(Rmax-R) in which:

K _d represents the affinity constant of the Fura-2 and calcium complex, Rmax is the maximum fluorescence intensity determined after addition of 1 μM of the Bromo-A23187 ionophore, Rmin is the minimum ratio determined after addition of

10 mM of EGTA (ethylenebis (oxyethylenenrilrilo) tetraacetic acid) consecutive to the addition of ionophore and Sf2 / Sb2 is the ratio of the fluorescence values under excitation at 380 nm determined at Rmin and Rmax, respectively. After a stabilization period of 1 minute, during which the basal intracellular calcium concentration is determined, the test compound or the control vehicle is added to the cells. After an incubation period of

2 minutes during which the calcium concentration is measured, these are stimulated with the different agonists (IL-8 or Gro-alpha). The calcium concentration is measured for 2 minutes.

The compounds of formula (I) described in the present invention inhibit the release of calcium induced by IL-8 or Gro-alpha.

The activity of the compounds according to the invention, demonstrated during biological tests, is significant for an antagonistic action of IL-8 and makes it possible to envisage their use in therapy.

Thus, the subject of the invention is also the compounds (I), as well as their pharmaceutically acceptable salts, solvates and hydrates, for their use as a medicament.

Also, according to another of its aspects, the invention relates to the use of the i compounds of formula (I), or of one of their pharmaceutically acceptable salts, solvates or [hydrates] for the preparation of a medicament intended for the preventive treatment or curative in mammals, in particular in humans, of diseases dependent on an activation of the CXCR2 receptor of 1TL-8 and chemokines of the same family, and which are generally characterized by a massive invasion of neutrophils. Among the diseases which can be treated, by administering a therapeutically sufficient amount, of at least one of the compounds of formula (I), there may be mentioned atopic dermatitis, osteoarthritis, rheumatoid arthritis, asthma, chronic obstruction of the lungs, acute respiratory distress syndrome, inflammation of the colon, Crohn's disease, ulcerative colitis, stroke, myocardial infarction, septic shock, multiple sclerosis';, endotoxic shock, psoriasis, septicemia with gram-negative bacteria, toxic shock syndrome, cardiac, pulmonary or renal ischemia and reperfusion phenomena, glomerulonephritis, thrombosis, reaction graft versus host, Alzheimer's disease, allograft rejection, malaria, restenosis, angiogenesis, atherosclerosis, osteoporosis, gingivitis, non-physiological release of bone marrow stem cells bone, the sick es caused by respiratory viruses, herpes viruses and hepatic viruses, meningitis ,; brain herpes, CNS vasculitis, brain trauma, CNS tumors, subarachnoid hemorrhage, post-surgical trauma, cystic fibrosis, prenatal labor, cough, pruritus, interstitial pneumonia, hypersensitivity, crystal-induced arthritis, Lyme disease arthritis, progressive ossifying fibrodysplasia, acute or chronic pancreatitis, acute alcoholic hepatitis, necrotizing enterocolitis, chronic sinusitis, uveitis, polymyositis, vasculitis, acne, gastric and duodenal ulcers, celiac disease, esophagitis, glossitis, pulmonary obstructions, pulmonary hyperreactivity, bronchiolitis leading to pneumonia, bronchiectasis, bronchiolitis, proliferative bronchiolitis, chronic bronchitis, dyspnea , emphysema, hypercapnia, hypoxemia, hypoxia, surgical reduction of pul volume monaire, pulmonary fibrosis, pulmonary hypertension, enlarged right ventricle, sarcoidosis, damage to the small bronchioles, ventilation-perfusion errors, wheezing, lupus, diseases associated with pathological angiogenesis, such as cancer, tumor cell proliferation and metastasis in the case of, for example, melanoma and cerebral ischemia. The invention therefore relates to the use of a compound of formula (I), or of a pharmaceutically acceptable salt, solvate or hydrate thereof, for the preparation of a medicament intended for the preventive or curative treatment of atopic dermatitis, l osteoarthritis, rheumatoid arthritis, asthma, chronic obstruction of the lungs, acute respiratory distress syndrome, inflammation of the colon, Crohn's disease, ulcerative colitis, stroke myocardial infarction, septic shock, multiple sclerosis, endotoxic shock, psoriasis, gram-negative septicemia, toxic shock syndrome, cardiac, pulmonary or reperfusion ischemia and reperfusion phenomena, glomerulo-nephritis, thrombosis, graft versus host reaction, Alzheimer's disease, allograft rejection, malaria, restenosis, angiogenesis, atherosclerosis, osteoporosis, gingivitis, non physiological release e of bone marrow stem cells, diseases caused by respiratory viruses, herpes viruses and liver viruses. The compounds of formula (I) must be administered in an amount sufficient to antagonize TIL-8 by binding competitively to its receptors .; The dose of active ingredient depends on the method of administration and the type of pathology and is generally between 0.01 and 10 mg / kg. The compounds of formula (I): can also be combined with another active principle. _! In the context of their therapeutic use, the compounds of formula (I) will generally be administered in various forms, in combination with the excipients commonly used. Also, the present invention also relates to

I pharmaceutical compositions containing a compound of formula (I) or n of its pharmaceutically acceptable salts, solvates or hydrates with a pharmaceutically acceptable vehicle, support or excipient. !

The formulation used may be an oral form, such as for example capsules, tablets containing the solid active principle in a sprayed or micronized form, a syrup or a solution containing the active principle in solution, in suspension, in emulsion or in micro -emulsion. ; The formulation can also be presented in a form which can be administered for topical use, for example a cream or a lotion or a device. transdermal such as an adhesive patch. The active principle can also be formulated for a mode of administration by subcutaneous, intramuscular or intravenous injection.

The following PREPARATIONS and EXAMPLES illustrate the invention without however limiting it. The following abbreviations are used: s = singlet, m = multiplet, d = doublet, t = triplet, quat = quadruplet, q = quintuplet.

PREPARATION 1

4-Fluoro-ε-oxobenzenehexanoic acid methyl ester, compound IV.l

A suspension of 2.59 g of aluminum chloride in 4 ml of dichloromethane is prepared. The mixture is cooled to -5 ° C. and a mixture of 0.97 ml of fluorobenzene and 1.31 ml of methyl ester of 6-chlorb-6-oxohexanoic acid in 3 ml of dichloromethane is gradually added. now the temperature between -4 and -7 ° C. The temperature is then allowed to rise to 20 ° C. and, after 15 hours, it is hydrolyzed on acidified ice water. The mixture is extracted i with dichloromethane and the organic phase obtained is washed with water, dried over magnesium sulfate and concentrated under reduced pressure. 2 g of crude product are thus recovered which are purified by chromatography on silica gel, eluting with a petroleum ether / ethyl acetate mixture, 96/4, v / v. 1.26 g of the expected product are thus obtained in the form of a white powder. (Yield = 63%) M = 58-59 ° C According to the same procedure, the following compounds are prepared:

- Methyl ester of 3,4-dichloro-ε-oxobenzenehexjanoic acid, compound IV.2; Mp 41-44 ° C. j

- Methyl ester of 3,4-difluoro-ε-oxobenzenehexânoïque acid, compound IV.3; Mp 41-43 ° C.

- Methyl ester of 4-chloro-3-ethyl-ε-oxobenzenehexianoic acid, compound IN.4 PREPARATION 2

3,4-dichloro-δ-oxobenzenepentanoic acid ethyl ester, compound IV.5

A suspension of 5 g of 3,4-dichloro-δ-oxo-benzenepentanoic acid in 60 ml of ethanol is prepared and 1 ml of pure sulfuric acid is added.

The mixture is brought to reflux with stirring for 5 hours. The reaction mixture is then concentrated under reduced pressure and then taken up in diethyl ether. This organic phase is washed with water, then with a dilute sodium hydroxide solution, then again with water. After drying over magnesium sulfate, the | solvent is evaporated off under reduced pressure and 2.6 g of the expected product are obtained in the form of a brown oil (yield = 47%)

1H NMR (300 MHz, CDC1 ₃ ): 8.05 (d, J = 1.5 Hz, 1H); 7.80 (dd, J = 1.5 Hz, J

≈ 8.1 Hz, 1H); 7.56 (d, J = 8.1 Hz, 1H); 4.13 (q, J = 7.4 Hz, 2H); 3.02 (t, J = 6.6

Hz, 2H); 2.42 (t, J = 6.6 Hz, 2H); 2.05 (q, J = 6.6 Hz, 2H); 1.25 (t, J = 7.4 Hz, 3H).

PREPARATION 3

Methyl ester of 4-chloro-3-methoxy-ε-oxobenzenehexanoic acid, compound IV.6 a) Ethyl ester of α-acetyl-4-chloro-3-meihoxy-β- oxobenzenepropanoic acid

500 μl of ethanol and 48 μl of carbon tetrachloride are added 237 mg i of magnesium then 4 ml of toluene, 1 ml of ethanol and 920 μl of ethyl acetoacetatel are added. The reaction mixture is stirred until the magnesium disappears. The reaction mixture is cooled to -5 ° C. and then 2 g of (4-chloro-3-methoxy) benzoyl chloride in 1 ml of toluene are added. After 2 hours 30 minutes of stirring at this temperature, the reaction mixture is heated for 30 minutes at 50 ° C. An ice / sulfonic acid mixture is added. After extraction with toluene, the solvents are evaporated under reduced pressure. b) Ethyl ester of 4-chloro-3-methoxy-β-oxob! enzene-propanoic acid

To 2.2 g of the compound obtained in a), a solution of 295 mg of sodium hydroxide in 10 ml of water, 787 mg of ammonium chloride and 1 ml of ammonium hydroxide are successively added. The reaction mixture is heated at 50 ° C for 3 hours, at reflux for 1 hour 30 minutes and at room temperature for 48 hours. After extraction with ethyl acetate, the solvents are evaporated under reduced pressure. A few drops of ethyl acetate are added to redissolve the precipitate and then petroleum ether is added. The precipitate is filtered and the filtrate is evaporated under reduced pressure. ; i c) Diethyl ester of 2- (4-chloro-3-methoxybenzoyl) hexanedioic acid

The residue obtained in b) is added dropwise to a solution of sodium ethylate obtained from 206 mg of sodium in 4 ml of ethanol. The reaction mixture is heated at reflux for 45 minutes then is cooled to 40 ° C. and 1.28 ml of ethyl 4-bromobutyrate are added at this temperature. The reaction mixture is heated at reflux for 4 hours 30 minutes. After returning to room temperature, the reaction mixture is filtered and washed with ethanol. After extraction with ethyl acetate, the solvents are evaporated under reduced pressure. The residue obtained is purified by chromatography on silica gel, eluting with a petroleum ether / ethyl acetate mixture, 95/5 then 9/1, v / v.

Η NMR (300 MHz, CDC1 ₃ ): 7.48 (d, 1H); 7.43 (dd, 1H); 7.36 (d, 1H); 4.17 (t, 1H); 4.05 (quat, 2H); 4.01 (quat, 2H); 3.87 (s, 3H); 2.26 (t, 2H); 1.94 (m, 2H); 1.58 (m, 2H); 1.14 (t, 3H); 1.08 (t, 3H). d) 4-Chloro-3-hydroxy-ε-oxobenzenehexanoic acid

2.3 ml of hydrobromic acid are added to 390 mg of the compound obtained

with a 10% aqueous solution of sodium carbonate. The aqueous phase is acidified to pH = 1 with an aqueous solution of IN hydrochloric acid and then is extracted from ethyl acetate. The organic phase is dried and then concentrated under reduced pressure.

1H NMR (300 MHz, DMSO): 7.50 (m, 3H); 2.58 (m, 2H); 2.25 (m, 2H); 1.55 (m, 4H). e) Compound IV.6

A mixture of 150 mg of the compound obtained in d), 182 mg of potassium carbpnate, 110 μl of dimethyl sulphate in 2 ml of acetone is heated to reflux

! for 15 hours. After filtration, the solvents are evaporated. After extraction with diethyl ether, the solvents are again evaporated. The residue is dissolved in ethyl acetate and a few drops of petroleum ether are added. The precipitate is filtered and the filtrate is evaporated.

1H NMR (300 MHz, CDC1 _3): 7.54 (d, 1H); 7.46 (m, 2H); 3.97 (s, 3H); 3.67 (s,

3H); 2.98 (t, 2H); 2.39 (t, 2H); 1.75 (m, 4H).

PREPARATION 4

5-Bromo-2- (3,4-dichlorophenyl) -IH-indole-3-butanoic acid methyl ester, compound III.l

A mixture of 1.5 g of compound TV.2 is prepared, 1.74 g of hydrochloride

4-bromophenylhydrazine, 0.71 g of zinc chloride in 10 ml of acetic acid. This mixture is brought to 65-70 ° C and kept stirring at this temperature for

5 hours. After cooling, 15 ml of water and 20 ml of ethyl acetate are added and the reaction mixture is filtered. The filtrate is extracted with 2 times 20 ml of ethyl acetate. The organic phase obtained is washed with water, dried over magnesium sulfate and the solvents are evaporated under reduced pressure. 1.55 g of beige solid are obtained.

M = 112-114 ° C.

According to the same procedure, the following compounds are prepared: - Methyl ester of 2- (3,4-difluorophenyl) -5-iodo-1H-indole-3-butanoic acid, compound III.2; Mp = 118-120 ° C - 2- (4-Chorophenyl) -5-iodo-1H-indole-3-butanoic acid methyl ester, compound III.3; F = 160-165 ° C - 5-Bromo-2- (4-fluorophenyl) -IH-iridole-3-butanoic acid methyl ester, compound III.4; F = 96-98 ° C

- 2- (3,4-Dichlorophenyl) -5-iodo-1H-indole-3-propanoic acid ethyl ester, compound III.5; M = 135-138 ° C - Methyl ester of 2- (5-chloro-2-thienyl) -5-iodo-iH-indole-3-butanoic acid, compound III.6

1 H NMR (300 MHz, DMSO): 11.50 (s, 1H); 7.92 (d, 1H); 7.37 (dd, 1H); 7.33 (d, 1H); 7.24 (d, 1H); 7.18 (d, 1H); 3.58 (s, 3H); 2.85 (t, 2H); 2.39 '(t, 2H); 1.82 (q, 2H). - Methyl ester of 2- (4-chloro-3-ethylphenyl) -5-iodo-IHj-indole- acid

3-butanoic, compound III.7

1H NMR (300 MHz, CDC1 ₃ ): 7.97 (s, 1H); 7.87 (d, 1H); 7.39 (dd, 1H); 7.36 (d, 1H); 7.33 (d, 1H); 7.23 (dd, 1H); 7.08 (d, 1H); 3.55 (s, 3H); 2.75 (m, 4H); 2.27 (t, 2H); 1.93 (q, 2H); 1.22 (t, 3H). - Methyl ester of 2- (4-chloro-3-methoxyphenyl) -5-iόdo-7H- indole-3-butanoic acid, compound III.8

Η NMR (300 MHz, DMSO): 11.4 (s, 1H); 7.95 (s, 1H); 7.55 (d, 1H); 7.38 (dd, 1H); 7.32 (d, 1H); 7.24 (d, 1H); 7.21 (dd, 1H); 3.95 (s, 3H); 3.58! (S, 3H); 2.85 (t, 2H); 2.40 (t, 2H); 1.85 (m, 2H).

PREPARATION 5

2- (3,4-dichlorophenyl) -5-cyano-1H-indole-3-butanoic acid methyl ester, compound II.l

A mixture of 1.6 g of compound III.1, 2.66 g of puyrous cyanide and 7 ml of N-methyl-2-pyrrolidone is prepared, which is heated at reflux for 16 hours. The reaction mixture is then cooled and 30 ml of water are added. The mixture is kept stirring at room temperature for 15 minutes and then 20 ml of ethylenediamine are added. The mixture is then extracted with twice 40 ml of toluene and the combined organic phases are washed with three times 30 ml of a saturated solution of sodium chloride and then dried over magnesium sulfate. After filtration, the solvents are evaporated under reduced pressure. The evaporation residue is dissolved in ethyl acetate then a few drops of cyclohexane are added. The expected product is filtered and dried under reduced pressure; Mp 158-160 ° C.

According to the same procedure, the following compounds are prepared: - 5-cyano-2- (3,4-difluorophenyl) -iH-indole-3-butanoic acid methyl ester, compound II.2;

1H NMR (300 MHz, CDC1 _3): 8.3 (s, IH); 7.99 (s, 1H); 7.45 (dd, 1H); 7.42 (d, 1H); 7.36 (m, 1H); 7.28 (m, 2H); 3.65 (s, 3H); 2.88 (t, 2H); 2.37 (t, 2H); 2.00 (q, 2H). - Methyl ester of 2- (4-chlorophenyl) -5-cyano-1H-indole-3-butanoic acid, compound II.3; M = 135-137 ° C

- 5-cyano-2- (4-fluorophenyl) -IH-indole-3-butanoic acid methyl ester, compound II.4;

1H NMR (300 MHz, CDC1 _3): 7.98 (s, IH); 7.53 (m, 2H); 7.42 (m, 2 ^ 1); 7.19 (m, 2H); 3.60 (s, 3H); 2.88 (t, 2H); 2.36 (t, 2H); 2.00 (q, 2H).

- 5-cyano-2- (3,4-dichlorophenyl) -7H-indoIe-3-propanoic acid ethyl ester, compound II.5; M = 148-151 ° C

- Methyl ester of 2- (5-chloro-2-thienyl) -5-cyano-2H-indole-3-butanoic acid, compound II.6; M 143-144 ° C - Methyl ester of 2- (4-chloro-3-ethylphenyl) -5-cyano-1H- indole-3-butanoic acid, compound II.7

1 H NMR (300 MHz, DMSO): 11.90 (s, 1 H); 8.17 (s, 1H); 7.61 (d, 1H); 7.57 (d, 1H); 7.50 (m, 3H); 3.55 (s, 3H); 2.88 (t, 2H); 2.79 (quat, 2H); 2.40 (t, 2H); 1.86 (q, 2H); 1.25 (t, 3H).

PREPARATION 6

5-iodo-IH-indole-3-butanoic acid methyl ester, compound VII.l

Compound VII.l is prepared from 4-iodoρhenylhydrazine and from the methyl ester i of 6-oxohexanoic acid according to a procedure analogous to that described in PREPARATION 4. Η NMR (300 MHz, DMSO): 10.95 (s, 1H); 7.85 (s, 1H); 7.32 (dd, 1H); 7.19 (d, 1H); 7.13 (d, 1H); 3.59 (s, 3H); 2.66 (t, 2H); 2.35 (t, 2H); 1.85 (q, '^ H).

PREPARATION 7 Methyl ester of 5-cyano-2H-indole-3-butanoic acid, compound

VI.l

A mixture of 1.586 g of compound VII.l, 602 mg of potassium cyanide, 88 mg of copper iodide and 267 mg of tetrakis (triphenylphosphine) palladium in 6 ml of tetrahydrofuran is heated to reflux with stirring for 8 hours. 88 mg of copper iodide and 267 mg of tetrakis (triphenylphosphine) palladium are added again, after 2 hours and 6 hours of stirring. After returning to room temperature, 200 ml of ethyl acetate are added and the mixture is filtered through celite. The organic phase is washed twice with water and with a saturated solution of sodium chloride and then dried over magnesium sulfate. The solvents are evaporated under reduced pressure. The residue obtained is purified by chromatography on silica gel, eluting with a petroleum ether / ethyl acetate mixture, 7/3, v / v; Mp 75-76 ° C.

PREPARATION 8 Methyl ester of 2-bromo-5-cyano-1H-indole-3-butanoic acid, compound V.l.

A solution 3 g of the compound VU in 125 ml of carbon tetrachloride is prepared and 2.56 g N-bromosuccinimide is added. The reaction mixture is brought to reflux with stirring for 4 hours and then cooled to room temperature; 200 ml of ethyl acetate and 200 ml of hot water are added. The organic phase is washed with hot water, then dried over magnesium sulfate. The solvahts are evaporated under reduced pressure. The residue obtained is taken up in petroleum ether and

! dichloromethane. After removing the petroleum ether, the precipitate obtained [is filtered i and washed with toluene. The filtrate is evaporated and the residue obtained is purified by chromatography on silica gel, eluting with the aid of a petroleum ether / ethyl acetate mixture, 8/2, v / v; Mp 105-106 ° C. PREPARATION 9

2- (4-Chloro-3-methylphenyl) -5-cya! No-JH-indole-3-butanoic acid methyl ester, compound II.8 A solution of 73 mg of compound Vl and 58 mg is prepared | acid

4-chloro-3-methylphenylboronic in 4.7 ml of methanol and 4.7 ml of toluene. We

! then add, with stirring, 29 mg of lithium chloride, 13 mg of tetrakis (triphenylphosphine) palladium and 0.57 ml of a 1M solution of sodium carbonate. The reaction mixture is then brought to reflux with stirring for 1 hour and then the solvents are evaporated under reduced pressure. The residual solid is purified by chromatography on silica gel, eluting with a petroleum ether / ethyl acetate mixture, 85/15 v / v.

1 H NMR (300 MHz, DMSO): 11.80 (s, 1 H); 8.17 (s, 1H); 7.65 (s, 1H); 7.58 (d, 1H); 7.48 (m, 3H); 3.55 (s, 3H); 2.88 (t, 2H); 2.38 (t, 2H); 1.89 (q, 2H) 1 According to a procedure, the following compounds are prepared:

- Methyl ester of 5-cyano-2- (4-fluoro-3-methylpheryyl) -2H-indole-3-butanoic acid, compound II.9;

Η NMR (300 MHz, DMSO): 11.88 (s, 1H); 8.13 (s, 1H); 7.58 (d, $ 1); 7.54 (m, 3H); 7.31 (m, 1H); 3.58 (s, 3H); 2.88 (t, 2H); 2.38 (t, 2H); 1.86 (q, 2HS). - Methyl ester of 2- [4-chloro-3- (trifluoromethyl) phenyl] -5-cyano-2H-indole-3-butanoic acid, compound 11.10;

- Methyl ester of 2- (3-chloro-4-fluorophenyl) -5-cyano-1H-indole-3-butanoic acid, compound 11.11;

Η NMR (300 MHz, DMSO): 11.90 (s, 1H); 8.20 (s, 1H); 7.85 (d, 1H); 7.66 (m, 1H); 7.61 (d, 1H); 7.49 (m, 2H); 3.55 (s, 3H); 2.88 (t, 2H); 2.40 (t, 2H); 1.85 (q, 2H).

- Methyl ester of 2- (4-chloro-3-fluorophenyl) -5-cyano-1H-indole-3-butanoic acid, compound 11.12; I

1 H NMR (300 MHz, DMSO): 11.93 (s, 1 H); 8.21 (s, 1H); 7.76 (d, 1H); 7.68 (dd, 1H); 7.50 (m, 3H); 3.55 (s, 3H); 2.90 (t, 2H); 2.39 (t, 2H); 1.84 (q, 2H). - Methyl ester of 2- (4-nitrophenyl) -5-cyano-1H-indole-3-butanoic acid, compound 11.13;

Η NMR (300 MHz, CDC1 ₃ ): 12.10 (s, 1H); 8.38 (d, 2H); 8.27 (s, 1H); 7.95 (d, 2H); 7.54 (m, 2H); 3.56 (s, 3H); 2.95 (t, 2H); 2.42 (t, 2H); 1.88 (q, 2H). - Methyl ester of 2- (4-cyanophenyl) -5-cyano-1H-ihdole-3-butanoic acid, compound 11.14; M = 149-151 ° C

- Methyl ester of 2- [4- (trifluoromethoxy) phenyl] -5-cyano-1H-indole-3-butanoic acid, compound 11.15; M = 142-143 ° C

PREPARATION 10

2- (4-chloro-3-methoxyphenyl) -5-cyano-2H-i ^ ιdole-3- butanoic acid methyl ester, compound 11.16

Compound 11.16 is prepared from compound iπ.8 according to a procedure analogous to that of PREPARATION 7. 1 H NMR (300 MHz, DMSO): 11.90 (s, 1 H); 8.19 (s, 1H); 7.58 (d, 1H); 7.52

(d, 1H); 7.48 (dd, 1H); 7.35 (dd, 1H); 7.24 (dd, 1H); 3.98 (s, 1H); 3.57 (s, 3H); 2.91 (t, 2H); 2.40 (t, 2H); 1.88 (m, 2H).

EXAMPLE 1 2- (3,4-Dichlorophenyl) -5-cyano-7H-indole-3-butanoic acid

A mixture of 80 mg of compound II.1 is prepared in 3 ml of dio ^ ane. 1 ml of a 1N sodium hydroxide solution in water is added and; brings the reaction mixture to reflux for 1 hour 30 minutes. The solvent is then

| removed under reduced pressure and the residue is taken up in 3 ml of water. The ¹ solution obtained is acidified with IN hydrochloric acid to pH = 1. The precipitate is separated by filtration and purified on silica gel, eluting with a; dichloromethane / methanol mixture, 9/1, v / v; F = 190-195 ° C ^'

According to a similar procedure, EXAMPLES 2 to 16 presented in TABLE 1 below are prepared:

TABLE 1

Claims

1. Compounds of formula (I)

in which :

- X represents a double bond -C = C- or a sulfur atom,

Ri and R ₂ represent, each independently of one another, a hydrogen atom, a halogen atom or a (Cι-C ₃ ) alkyl, (Cj-C ₃ J) alkoxy, trifluoromethyl group, trifluoromethoxy, cyano or nitro,

- n is equal to 2 or 3, as well as their pharmaceutically acceptable salts, solvates and hydrates. 2. Compounds according to claim 1 of formula (la):

in which Ri, R ₂ and n are as defined for (I) in claim 1. as well as their pharmaceutically acceptable salts, solvates and hydrates. 3. Compounds according to claim 2 of formula (Ib):

in which Ri, R ₂ and n are as defined for (I) in claim 1, as well as their pharmaceutically acceptable salts, solvates and hydrates.

. Compounds according to any one of Claims 1 to 3, characterized in that Rj and R ₂ represent, each independently, a hydrogen, chlorine or fluorine atom or a (Cι-C ₂ ) alkyl, methoxy, trifluoromethyl group, trifluoromethoxy, cyano or nitro.

5. Compounds according to claim 4, characterized in that Rj and R ₂ represent, each independently, a hydrogen, chlorine or fluorine atom or a methyl group.

6. Compounds according to any one of claims 1 to 5, characterized in that n is equal to 3.

7. Compounds according to any one of claims 1 to 6, characterized in that Ri represents a chlorine or fluorine atom.

8. Esters of formula (H):

in which Ri, R, X and n are as defined for (I) and R ₃ represents a (C] -C ₄ ) alkyl group.

9. Compound according to any one of claims 1 to 7 for its use as a medicament.

10. Pharmaceutical composition containing a compound according to any one of claims 1 to 7 with a pharmaceutically acceptable vehicle, support or excipient.

11. Use of a compound according to any one of claims 1 to 7 for the preparation of a medicament intended for the preventive or curative treatment of diseases dependent on the activation of the interleukin-8 receptor CXCR2 and of the chemokines of the same family.

12. Use according to claim 11 for the preparation of a medicament intended for the preventive or curative treatment of atopic dermatitis, osteoarthritis, rheumatoid arthritis, asthma, chronic obstruction of the lungs, syndrome acute respiratory distress, inflammation of the colon, Orohn's disease, ulcerative colitis, stroke, myocardial infarction, skeptic shock, multiple sclerosis, endotoxic shock, psoriasis, sepsis with gram-negative bacteria, toxic shock syndrome, cardiac, pulmonary or renal ischemia and reperfusion phenomena, glomerulo-nephritis, thrombosis, graft versus host reaction, Alzheimer's disease, rejection of allografts, malaria, restenosis, angiogenesis, atherosclerosis, osteoporosis, gingivitis, non-physiological release of cells; bone marrow strains, diseases caused by respiratory viruses, herpes viruses and liver viruses.