WO2006111560A2 - 2,3 substituted pyrazine sulfonamides as inhibitors of crth2 - Google Patents

2,3 substituted pyrazine sulfonamides as inhibitors of crth2 Download PDF

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Publication number
WO2006111560A2
WO2006111560A2 PCT/EP2006/061706 EP2006061706W WO2006111560A2 WO 2006111560 A2 WO2006111560 A2 WO 2006111560A2 EP 2006061706 W EP2006061706 W EP 2006061706W WO 2006111560 A2 WO2006111560 A2 WO 2006111560A2
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WIPO (PCT)
Prior art keywords
phenyl
methyl
pyrazin
benzenesulfonamide
trifluoromethyl
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PCT/EP2006/061706
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French (fr)
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WO2006111560A3 (en
Inventor
Patrick Page
Matthias Schwarz
Eric Sebille
Christophe Cleva
Cedric Merlot
Maurizio Maio
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Laboratoires Serono S.A.
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Priority to MX2007012937A priority Critical patent/MX2007012937A/en
Priority to CA2601979A priority patent/CA2601979C/en
Priority to BRPI0610035-0A priority patent/BRPI0610035A2/en
Priority to DK06754765.3T priority patent/DK1871374T3/en
Application filed by Laboratoires Serono S.A. filed Critical Laboratoires Serono S.A.
Priority to AU2006237365A priority patent/AU2006237365B2/en
Priority to EP06754765A priority patent/EP1871374B1/en
Priority to KR1020077025817A priority patent/KR101380448B1/en
Priority to US11/918,294 priority patent/US8796280B2/en
Priority to PL06754765T priority patent/PL1871374T3/en
Priority to JP2008507083A priority patent/JP5677719B2/en
Priority to AT06754765T priority patent/ATE524182T1/en
Priority to CN2006800218062A priority patent/CN101217957B/en
Publication of WO2006111560A2 publication Critical patent/WO2006111560A2/en
Publication of WO2006111560A3 publication Critical patent/WO2006111560A3/en
Priority to HK08113046.9A priority patent/HK1119080A1/en

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Definitions

  • the present invention relates to 2,3 substituted pyrazine sulfonamides for use as pharmaceutical active compounds, as well as pharmaceutical formulations containing such
  • 2,3 substituted pyrazine sulfonamides are useiul for the treatment and/or prevention of allergic diseases and inflammatory dermatoses.
  • the present invention is related to the use of 2,3 substituted pyrazine sulfonamides for the modulation, notably the inhibition of CRTH2 activity.
  • the present invention furthermore relates to novel 2,3 substituted pyrazine sulfonamides as well as methods of their preparation.
  • PGD2 Prostaglandin D2
  • GPCR G-protein coupled receptor
  • CRTH2 Chemoattractant Receptor-Homologous molecule expressed on T-Helper 2 cells
  • human CRTH2 is selectively expressed on Th2 cells and is highly expressed on cell types associated with allergic inflammation such as eosinophils, basophiles and Th2 cells.
  • CRTH2 mediates PGD2 dependent cell migration of blood eosinophils and basophiles.
  • increased numbers of circulating T cells expressing CRTH2 have been correlated with the severity of atopic dermatitis (Cosmi et al. (2000) Eur. J. Immunol. 30, 2972-2979).
  • the interaction of CRTH2 with PGD2 plays a critical role in the allergen-induced recruitment of Th2 cells in the target tissues of allergic inflammation. Compounds that inhibit the binding of CRTH2 and PGD2 should therefore be useful for the treatment of allergic diseases.
  • Allergic disease like asthma, and inflammatory dermatoses represent a major class of complex, and typically chronic, inflammatory diseases that currently affect about 10% of the population and that number appears to be increasing (Bush, R.K., Georgitis J.W., Handbook of asthma and rhinitis. 1st ed. (1997), Abingdon: Blackwell Science. 270).
  • Atopic dermatitis is a chronic skin disease, wherein the skin becomes extremely itchy. It accounts for 10 to 20 percent of all visits to dermatologists. The increasing incidence of allergic diseases and inflammatory dermatoses worldwide underscores the need for new therapies to effectively treat or prevent these diseases.
  • WO 04/096777 (Bayer Healthcare AG) relates to pyrimidine derivatives, which are useful for the treatment of diseases mediated by CRTH2.
  • WO 04/035543 and WO 05/102338 disclose tetrahydrochinoline derivatives as CRTH2 antagonists (C), which are also described to be effective in the treatment of neuropatic pain.
  • tetrahydrochinoline derivatives as CRTH2 modulators are also provided by WO 04/032848 (Millennium Pharmaceutical Inc.) and WO 05/007094 (Tularik Inc.). These tetrahydrochinoline derivatives are said to be useful for treating disorders associated with allergic inflammation processes.
  • WO 04/108692 and WO 04/108717 disclose pyrazine sulfonamide compounds that modulate specifically CCR4.
  • Pyrazine sulfonamide compounds have also been disclosed in WO 04/058265 as compounds that interact with G protein-coupled receptors.
  • One aspect of the present invention consists in the use of 2,3 substituted pyrazine sulfonamides represented by the general formula (I) as pharmaceutical active compounds.
  • Such compounds are suitable for the treatment and/or prevention of allergic disease and inflammatory dermatoses.
  • Said compounds modulate a specific member of the G protein- coupled family, namely CRTH2.
  • the invention relates to 2,3 substituted pyrazine sulfonamides of Formula (I):
  • A, B, R 1 , R 2 , R 3 and m are defined as described in the detailed description below, for use as a medicament.
  • the invention iurther provides a pharmaceutical composition comprising a compound of Formula (I), together with a pharmaceutically acceptable excipient or carrier.
  • the invention further relates to the use of compounds of Formula I for the preparation of a medicament for the treatment and/or prevention of diseases selected from allergic diseases such as allergic asthma, allergic rhinitis, allergic conjunctivitis, systemic anaphylaxis or hypersensitivity responses, and inflammatory dermatoses such as atopic dermatitis, eczema, allergic contact dermatitis, and urticaria, myositis, neurodegenerative disorders such as neuropatic pain, and other inflammatory diseases such as rheumatoid arthritis, multiple sclerosis, osteoarthritis, and inflammatory bowel disease (IBD) and other diseases or disorders associated with CTRH2 activity.
  • allergic diseases such as allergic asthma, allergic rhinitis, allergic conjunctivitis, systemic anaphylaxis or hypersensitivity responses
  • inflammatory dermatoses such as atopic dermatitis, eczema, allergic contact dermatitis, and urticaria, myositis, neurodegenerative disorders
  • the invention further relates to a method for treating and/or preventing a patient suffering from a disease selected from allergic diseases such as allergic asthma, allergic rhinitis, allergic conjunctivitis, systemic anaphylaxis or hypersensitivity responses, and inflammatory dermatoses such as atopic dermatitis, eczema, allergic contact dermatitis, and urticaria, myositis, neurodegenerative disorders such as neuropatic pain, and other inflammatory diseases such as rheumatoid arthritis, multiple sclerosis, osteoarthritis, and inflammatory bowel disease (IBD) and other diseases and disorders associated with CTRH2 activity, by administering a compound according to Formula (I).
  • allergic diseases such as allergic asthma, allergic rhinitis, allergic conjunctivitis, systemic anaphylaxis or hypersensitivity responses
  • inflammatory dermatoses such as atopic dermatitis, eczema, allergic contact dermatitis, and urticaria, myos
  • the invention further relates to the use of compounds of Formula I for the preparation of a pharmaceutical composition.
  • the invention finally relates to novel compounds of Formula I as well as to methods to synthesize these molecules.
  • C 1 -C 6 -alkyl refers to monovalent alkyl groups having 1 to 6 carbon atoms. This term is exemplified by groups such as methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert- butyl, n-hexyl and the like.
  • Aryl refers to an unsaturated aromatic carbocyclic group of from 6 to 14 carbon atoms having a single ring (e.g. phenyl) or multiple condensed rings (e.g. naphthyl).
  • Preferred aryl include phenyl, naphthyl, phenantrenyl and the like.
  • the aryl ring may be also fused to a heterocycloalkyl group. Such fused aryls include dihydrobenzimidazole-2-one, benzo[l,3]dioxole and the like.
  • Ci-C ⁇ -alkyl aryl refers to d-C ⁇ -alkyl groups having an aryl substituent, such as, for example, benzyl, phenethyl and the like.
  • Heteroaryl refers to a monocyclic heteroaromatic, or a bicyclic or a tricyclic fused-ring heteroaromatic group.
  • Particular examples of heteroaromatic groups include optionally substituted pyridyl, pyrrolyl, pyrimidinyl, furyl, thienyl, imidazolyl, oxazolyl, isoxazolyl, thiazolyl, isothiazolyl, pyrazolyl, 1,2,3-triazolyl, 1,2,4-triazolyl, 1,2,3-oxadiazolyl, 1,2,4- oxadiazolyl, 1,2,5-oxadiazolyl, l,3,4-oxadiazolyl,l,3,4-triazinyl, 1,2,3-triazinyl, 1,3,4- thiadiazolyl, benzofuryl, [2,3-dihydro]benzofuryl, isobenzofuryl, benzothienyl,
  • Ct-C ⁇ -alkyl heteroaryl refers to Ct-C ⁇ -alkyl groups having a heteroaryl substituent, such as, for example, 2-furylmethyl, 2-thienylmethyl, 2-(lH-indol-3-yl)ethyl and the like.
  • C 3 -C8-cycloalkyl refers to a saturated carbocyclic group of from 3 to 8 carbon atoms having a single ring (e.g., cyclohexyl) or multiple condensed rings (e.g., norbornyl).
  • Preferred cycloalkyl include cyclopentyl, cyclohexyl, norbornyl and the like.
  • C 3 -C8-heterocycloalkyl refers to a C 3 -C8-cycloalkyl group according to the definition above, in which up to 3 carbon atoms are replaced by heteroatoms chosen from the group consisting of O, S, NR, R being defined as hydrogen or methyl.
  • Preferred heterocycloalkyl include pyrrolidine, piperidine, piperazine, 1-methylpiperazine, morpholine, and the like.
  • Ct-C ⁇ -alkyl cycloalkyl refers to d-C ⁇ -alkyl groups having a cycloalkyl substituent, including cyclohexylmethyl, cyclopentylpropyl, and the like.
  • CrC ⁇ -alkyl heterocycloalkyl refers to d-C ⁇ -alkyl groups having a heterocycloalkyl substituent, including 2-(l-pyrrolidinyl)ethyl, 4-mo ⁇ holinylmethyl, (l-methyl-4- piperidinyl)methyl and the like.
  • C 2 -C 6 -alkenyl refers to alkenyl groups preferably having from 2 to 6 carbon atoms and having one or more sites of alkenyl unsaturation.
  • C 2 -C 6 -alkynyl refers to alkynyl groups preferably having from 2 to 6 carbon atoms and having one or more sites of alkynyl unsaturation.
  • Carboxy refers to the group -C(O)OR, where R includes hydrogen or "d-Ce-alkyl”.
  • Acyl refers to the group -C(O)R where R includes "d-Ce-alkyl”, “aryl”, “heteroaryl”, “C 3 -C 8 -cycloalkyl”, “C 3 -C 8 -heterocycloalkyl”, “d-Ce-alkyl aryl” or "d-Ce-alkyl heteroaryl".
  • Acyloxy refers to the group -OC(O)R where R includes "d-Ce-alkyl”, “aryl”, “heteroaryl”, “Ci-C 6 -alkyl aryl” or “Ci-C 6 -alkyl heteroaryl”.
  • Aryl acyl refers to aryl groups having an acyl substituent, including 2-acetylphenyl and the like.
  • Heteroaryl acyl refers to heteroaryl groups having an acyl substituent, including 2- acetylpyridyl and the like.
  • Alkoxy refers to the group -O-R where R includes "d-Ce-alkyl", “C 2 -C 6 -alkenyl”, “C 2 - C 6 -alkynyl", “C 3 -C 8 -cycloalkyl", “heterocycloalkyl", “aryl”, “heteroaryl”, “d-Ce-alkyl aryl” or “d-Ce-alkyl heteroaryl", “C 2 -C 6 -alkenyl aryl”, “C 2 -C 6 -alkenyl heteroaryl", “C 2 - C 6 -alkynyl aryl", “C 2 -C 6 -alkynylheteroaryl", “d-Ce-alkyl cycloalkyl", “d-Ce-alkyl heterocycloalkyl”.
  • Preferred alkoxy groups include by way of example, methoxy, ethoxy, phenoxy and the like.
  • Ct-C ⁇ -alkyl alkoxy refers to d-Co-alkyl groups having an alkoxy substituent, including 2-ethoxyethyl and the like.
  • Alkoxycarbonyl refers to the group -C(O)OR where R includes "d-Ce-alkyl” or “aryl” or “heteroaryl” or “d-Ce-alkyl aryl” or “d-Ce-alkyl heteroaryl”.
  • Aminocarbonyl refers to the group -C(O)NRR' where each R, R' includes independently hydrogen or d-Ce-alkyl or aryl or heteroaryl or "d-Co-alkyl aryl” or "d-Ce-alkyl heteroaryl".
  • Acylamino refers to the group -NR(CO)R' where each R, R' is independently hydrogen or "Ci-C 6 -alkyl” or “aryl” or “heteroaryl” or "Ci-C 6 -alkyl aryl” or "Ci-C 6 -alkyl heteroaryl”.
  • Halogen refers to fluoro, chloro, bromo and iodo atoms.
  • “Sulfonyloxy” refers to a group -OSO 2 -R wherein R is selected from H, "d-Ce-alkyl", “d-Ce-alkyl” substituted with halogens, e.g., an -OSO 2 -CF 3 group, "C 2 -C 6 -alkenyl", “C 2 - C 6 -alkynyl", “C 3 -C 8 -cycloalkyl", “heterocycloalkyl", “aryl”, “heteroaryl”, “d-Ce-alkyl aryl” or “Ct-Ce-alkyl heteroaryl", “C 2 -C 6 -alkenyl aryl", “C 2 -C 6 -alkenyl heteroaryl", “C 2 - C 6 -alkynyl aryl", “C 2 -C 6 -alkynylheteroaryl", “Ct-Ce-alkyl cycl
  • “Sulfonyl” refers to group “-SO 2 -R" wherein R is selected from H, "aryl”, “heteroaryl”, “d-Ce-alkyl”, “d-Ce-alkyl” substituted with halogens, e.g., an -SO 2 -CF 3 group, "C 2 -C 6 - alkenyl”, “C 2 -C 6 -alkynyl”, “C 3 -C 8 -cycloalkyl”, “heterocycloalkyl", “aryl”, “heteroaryl”, “Ci-Ce-alkyl aryl” or “Ct-Ce-alkyl heteroaryl", “C 2 -C 6 -alkenyl aryl", “C 2 -C 6 -alkenyl heteroaryl", “C 2 -C 6 -alkynyl aryl”, “C 2 -C 6 -alkynylheteroaryl", "d-C
  • “Sulfinyl” refers to a group “-S(O)-R” wherein R is selected from H, "d-Ce-alkyl", “C 1 - C 6 -alkyl” substituted with halogens, e.g., an -SO-CF 3 group, "C 2 -C 6 -alkenyl", “C 2 -C 6 - alkynyl", “C 3 -C 8 -cycloalkyl", “heterocycloalkyl", “aryl”, “heteroaryl”, “d-Ce-alkyl aryl” or “Ci-C 6 -alkyl heteroaryl", “C 2 -C 6 -alkenyl aryl", “C 2 -C 6 -alkenyl heteroaryl", "C 2 -C 6 - alkynyl aryl", “C 2 -C 6 -alkynylheteroaryl", “d-Ce-alkyl cycl
  • Sulfanyl refers to groups -S-R where R includes H, "d-Ce-alkyl", “d-Ce-alkyl” optionally substituted with halogens., e.g a -S-CF 3 group, "C 2 -C 6 -alkenyl”, “C 2 -C 6 - alkynyl", “C 3 -C 8 -cycloalkyl", "heterocycloalkyl", “aryl”, “heteroaryl”, “d-Ce-alkyl aryl” or “d-Ce-alkyl heteroaryl", “C 2 -C 6 -alkenyl aryl", “C 2 -C 6 -alkenyl heteroaryl", “C 2 -C 6 - alkynyl aryl", “C 2 -C 6 -alkynylheteroaryl", “d-Ce-alkyl cycloalkyl", "d-Ce-alkyl
  • “Sulfonylamino” refers to a group -NRSO 2 -R' where each R, R' includes independently hydrogen, "d-Ce-alkyl", “C 2 -C 6 -alkenyl”, “C 2 -C 6 -alkynyl", “C 3 -C 8 -cycloalkyl", “heterocycloalkyl", “aryl”, “heteroaryl”, “d-Ce-alkyl aryl” or “d-Ce-alkyl heteroaryl", “C 2 -C 6 -alkenyl aryl", “C 2 -C 6 -alkenyl heteroaryl", “C 2 -C 6 -alkynyl aryl", “C 2 -C 6 - alkynylheteroaryl", “d-Ce-alkyl cycloalkyl", “d-Ce-alkyl heterocycloalkyl”.
  • Aminosulfonyl refers to a group -SO 2 -NRR where each R, R' includes independently hydrogen, "d-Ce-alkyl”, “C 2 -C 6 -alkenyl”, “C 2 -C 6 -alkynyl", “C 3 -C 8 -cycloalkyl", “heterocycloalkyl", “aryl”, “heteroaryl”, “Ci-C 6 -alkyl aryl” or “Ci-C 6 -alkyl heteroaryl", “C 2 -C 6 -alkenyl aryl", “C 2 -C 6 -alkenyl heteroaryl", “C 2 -C 6 -alkynyl aryl", “C 2 -C 6 - alkynylheteroaryl", “d-Ce-alkyl cycloalkyl", “d-Ce-alkyl heterocycloalkyl”.
  • Amino refers to the group -NRR' where each R, R' is independently hydrogen, "C 1 -C 6 - alkyl", “C 2 -C 6 -alkenyl”, “C 2 -C 6 -alkynyl”, “C 3 -C 8 -cycloalkyl", “heterocycloalkyl", “aryl”, “heteroaryl”, “d-Ce-alkyl aryl” or “d-Ce-alkyl heteroaryl", “C 2 -C 6 -alkenyl aryl”, “C 2 -C 6 - alkenyl heteroaryl", “C 2 -C 6 -alkynyl aryl", “C 2 -C 6 -alkynylheteroaryl", “d-Ce-alkyl cycloalkyl", “d-Co-alkyl heterocycloalkyl", and where R and R', together with the nitrogen atom to which they are attached, can optionally
  • substitution is meant to also comprise situations where neighboring substituents undergo ring closure, in particular when vicinal functional substituents are involved, thus forming e.g. lactams, lactons, cyclic anhydrides, but also acetals, thioacetals, aminals formed by ring closure for instance in an effort to obtain a protective group.
  • “Pharmaceutically acceptable cationic salts or complexes” is intended to define such salts as the alkali metal salts, (e.g. sodium and potassium), alkaline earth metal salts (e.g. calcium or magnesium), aluminium salts, ammonium salts and salts with organic amines such as with methylamine, dimethylamine, trimethylamine, ethylamine, triethylamine, morpholine, N-Me-D-glucamine, N,N'-bis(phenylmethyl)-l,2-ethanediamine, ethanolamine, diethanolamine, ethylenediamine, N-methylmorpholine, piperidine, benzathine (N,N'-dibenzylethylenediamine), choline, ethylene-diamine, meglumine (N- methylglucamine), benethamine (N-benzylphenethylamine), diethylamine, piperazine, thromethamine (2-amino-2-hydroxymethyl-l
  • “Pharmaceutically acceptable salts or complexes” refers to salts or complexes of the below- identified compounds of Formula I that retain the desired biological activity.
  • Examples of such salts include, but are not restricted to, acid addition salts formed with inorganic acids (e.g.
  • hydrochloric acid hydrobromic acid, suliuric acid, phosphoric acid, nitric acid, and the like
  • organic acids such as acetic acid, oxalic acid, tartaric acid, succinic acid, malic acid, fumaric acid, maleic acid, ascorbic acid, benzoic acid, tannic acid, pamoic acid, alginic acid, polyglutamic acid, naphthalene sulfonic acid, naphthalene disul- fonic acid, and poly-galacturonic acid.
  • Said compounds can also be administered as pharmaceutically acceptable quaternary salts known by a person skilled in the art, which specifically include the quarternary ammonium salt of the Formula -NR,R',R" + Z " , wherein R, R', R" is independently hydrogen, alkyl, or benzyl, and Z is a counterion, including chloride, bromide, iodide, -O-alkyl, toluenesulfonate, methylsulfonate, sulfonate, phosphate, or carboxylate (such as benzoate, succinate, acetate, glycolate, maleate, malate, fumarate, citrate, tartrate, ascorbate, cinnamoate, mandeloate, and diphenylacetate).
  • R, R', R" is independently hydrogen, alkyl, or benzyl
  • Z is a counterion, including chloride, bromide, iodide, -O-alkyl,
  • “Pharmaceutically active derivative” refers to any compound that, upon administration to the recipient, is capable of providing directly or indirectly, the activity disclosed herein.
  • the compounds of the present invention according to Formula I are useful in the treatment and/or prevention of diseases selected from allergic diseases such as allergic asthma, allergic rhinitis, allergic conjunctivitis, systemic anaphylaxis or hypersensitivity responses, and inflammatory dermatoses such as atopic dermatitis, eczema, allergic contact dermatitis, and urticaria, myositis, neurodegenerative disorders such as neuropatic pain, and other inflammatory diseases such as rheumatoid arthritis, multiple sclerosis, osteoarthritis, and inflammatory bowel disease (IBD).
  • allergic diseases such as allergic asthma, allergic rhinitis, allergic conjunctivitis, systemic anaphylaxis or hypersensitivity responses
  • inflammatory dermatoses such as atopic dermatitis, eczema, allergic contact dermatitis, and urticaria, myositis, neurodegenerative disorders such as neuropatic pain, and other inflammatory diseases such as rheumatoi
  • the compounds according to Formula (I) are suitable as modulators, notably as antagonists, of CRTH2. Therefore, the compounds of the present invention are also particularly useful for the treatment and/or prevention of disorders, which are mediated by CRTH2 activity. Said treatment involves the modulation of CRTH2, notably an inhibition of CRTH2 or an antagonizing effect of CRTH2 in mammals, and in particular in humans.
  • the modulators of CRTH2 are selected from the group consisting of an antagonist, an inverse agonist, a partial agonist and an agonist of CRTH2.
  • the modulators of CRTH2 are antagonists of CRTH2.
  • the modulators of CRTH2 are inverse agonists of CRTH2.
  • the modulators of CRTH2 are partial agonists of CRTH2.
  • the modulators of CRTH2 are agonists of CRTH2.
  • the compounds according to Formula (I) are suitable for use as a medicament.
  • Compounds of Formula (I) include also their geometrical isomers, their optically active forms as enantiomers, diastereomers, its racemate forms and tautomers, as well as pharmaceutically acceptable salts thereof, wherein:
  • A is either an amine selected from the group consisting of:
  • n an integer independently selected irom 0, 1, 2, 3 or 4;
  • n 1 or 2;
  • R 7 is selected from the group consisting of hydrogen, substituted or unsubstituted Ct-C ⁇ -alkyl, substituted or unsubstituted C 2 -C 6 -alkenyl, substituted or unsubstituted C 2 -C 6 - alkynyl, substituted or unsubstituted aryl, substituted or unsubstituted heteroaryl, substituted or unsubstituted C 3 -C 8 -cycloalkyl, substituted or unsubstituted C 3 -C 8 - heterocycloalkyl, carboxyl, cyano, amino and hydroxyl.
  • R 8 is selected from the group consisting of hydrogen, substituted or unsubstituted C 1 -C 6 - alkyl, substituted or unsubstituted aryl, and substituted or unsubstituted heteroaryl.
  • B is selected from the group consisting of a substituted or unsubstituted C 2 -C 6 -alkynyl, substituted or unsubstituted C 3 -C 8 -cycloalkyl, substituted or unsubstituted C 3 -C 8 - heterocycloalkyl, substituted or unsubstituted aryl, and substituted or unsubstituted monocyclic heteroaryl.
  • Examples of B include ethynyl, propynyl, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, cyclooctyl, pyrrolidinyl, pyrazolidinyl, piperidinyl, piperazinyl, pyridyl, imidazolidinyl, 1,2,4-oxadiazolidinyl, 1,2,5-oxadiazolidinyl, 1,3,4-oxadiazolidinyl, isoxazolidinyl, morpholinyl, phenyl, naphthyl, pyrrolyl, pyrimidyl, furyl, thienyl, imidazolyl, oxazolyl, isoxazolyl, thiazolyl, isothiazolyl, carbazolyl, 1,2,3-triazolyl, 1,2,4- triazolyl, 1,2,3-
  • B is selected from the group of a substituted or unsubstituted aryl, a substituted or unsubstituted C 3 -C8-heterocycloalkyl and a substituted or unsubstituted alkynyl.
  • B is a substituted or unsubstituted aryl group (e.g. phenyl).
  • phenyl group is mono-substituted in ortho, meta or para position.
  • B is a C 3 -C 8 -heterocycloalkyl group (e.g. piperazinyl, furyl or thienyl).
  • B is an alkynyl group (e.g. ethynyl or propynyl).
  • R 1 is either hydrogen or a substituted or unsubstituted d-C ⁇ -alkyl. In a preferred embodiment R 1 is hydrogen.
  • R 2 is selected from the group consisting of substituted or unsubstituted Ct-C ⁇ -alkyl, substituted or unsubstituted aryl, and substituted or unsubstituted heteroaryl, substituted or unsubstituted C 3 -C 8 -cycloalkyl and substituted or unsubstituted C 3 -C 8 -heterocycloalkyl.
  • R 2 examples include methyl, ethyl, propyl, t-butyl, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, cyclooctyl, pyrolidinyl, pyrazolidinyl, piperidinyl, piperazinyl, pyridyl, imidazolidinyl, 1,2,4-oxadiazolidinyl, 1,2,5-oxadiazolidinyl, 1,3,4-oxadiazolidinyl, isoxazolidinyl or morpholinyl, phenyl, naphthyl, pyrrolyl, pyrimidyl, quinolizinyl, iuryl, thienyl, imidazolyl, oxazolyl, isoxazolyl, thiazolyl, isothiazolyl, carbazolyl, 1,2,3-triazolyl
  • R 2 is a substituted or unsubstituted aryl group (e.g. phenyl).
  • the substituents in a substituted R 2 are selected from the group consisting of halogen, cyano, d-C ⁇ -alkyl, d-C ⁇ -alkoxy, thioalkoxy and thioalkyl.
  • R 2 is optionally substituted with one or more substituents selected from the group consisting of halogen, cyano, d-C ⁇ -alkyl, d-C ⁇ -alkoxy, thioalkoxy and thioalkyl.
  • R 2 is substituted in ortho, meta or para position.
  • R 2 is chlorophenyl.
  • R 2 is substituted or unsubstituted heteroaryl group (e.g. pyridinyl or thienyl).
  • R 2 is a substituted or unsubstituted d-C ⁇ -alkyl group (e.g. methyl).
  • R 3 is selected from the group consisting of a substituted or unsubstituted d-Ce-alkyl, substituted or unsubstituted aryl, substituted or unsubstituted heteroaryl, substituted or unsubstituted C 3 -C8-cycloalkyl and substituted or unsubstituted C 3 -C8-heterocycloalkyl; wherein said substituted or unsubstituted aryl, heteroaryl, C 3 -C8-cycloalkyl or C 3 -C 8 - heterocycloalkyl may be fused to one or more substituted or unsubstituted aryl, heteroaryl, C 3 -C 8 -cycloalkyl or C 3 -C 8 -heterocycloalkyl group and may be substituted with one or more substituents selected of the group consisting of Ct-C ⁇ -alkyl, alkoxy, aryl, heteroaryl, carboxyl, cyan
  • R 3 examples include methyl, ethyl, propyl, butyl, t-butyl, phenyl, naphthyl, phenantrenyl, pyrrolyl, furyl, thienyl, imidazolyl, oxazolyl, isoxazolyl, thiazolyl, isothiazolyl, pyrazolyl, carbazolyl, 1,2,3-triazolyl, 1,2,4-triazolyl, 1,2,3-oxadiazolyl, benzo(2,l,3)oxadiazolyl, benzo(l,2,5)oxadiazolyl, benzo[l,3]dioxole, 1,2,4-oxadiazolyl, 1,2,5-oxadiazolyl, 1,3,4-oxadiazolyl, tetrazolyl, 1,3,4-triazinyl, 1,2,3-triazinyl, benzofuryl, [2,3-dihydro]benzof
  • R 3 is a substituted or unsubstituted aryl group (e.g. phenyl or naphthyl).
  • the substituents in a substituted R 3 are selected from the group consisting of halogen, cyano, Ct-C ⁇ -alkyl, Ct-C ⁇ -alkoxy, heteroaryl, aryl, thioalkoxy and thioalkyl.
  • R 3 is optionally substituted with one or more substituents selected from the group consisting of halogen, cyano, d-Co-alkyl, Ct-C ⁇ -alkoxy, heteroaryl, aryl, thioalkoxy and thioalkyl.
  • substituents selected from the group consisting of halogen, cyano, d-Co-alkyl, Ct-C ⁇ -alkoxy, heteroaryl, aryl, thioalkoxy and thioalkyl.
  • substituents selected from the group consisting of halogen, cyano, d-Co-alkyl, Ct-C ⁇ -alkoxy, heteroaryl, aryl, thioalkoxy and thioalkyl.
  • Examples for a substituted phenyl moiety are 4-trifluoromethoxyphenyl, 3-methoxyphenyl, 4-chlorophenyl, 3,5-dimethylphenyl, 2-benzamide or 2-benzoic acid.
  • R 3 is a substituted or unsubstituted heteroaryl group (e.g. pyridyl, quinolyl, benzimidazolyl, indolyl, pyridazinyl, pyrazinyl or 1,3,4-thiadiazolyl).
  • a substituted benzimidazole is 2-ethyl-2H-benzimidazolyl.
  • R 3 is an aryl group iused to a C 3 -C8-heterocycloalkyl group (e.g. 1 ,3-dihydrobenzimidazole-2-one, 3,4-dihydro lH-benzo[ 1 ,4]diazepine-2,5-dione).
  • R 3 is a substituted or unsubstituted C 3 -C8-heterocyclalkyl group fused to a substituted or unsubstituted aryl group (e.g. 1,2,3,4-tetrahydrochinoline, 1,2,3,4- tetrahydrochinoxaline, 2,3-dehydrobenzol,4-oxazine, 2,3-dehydro-indole or dihydrobenzo- pyrrolodiazepine).
  • a substituted or unsubstituted aryl group e.g. 1,2,3,4-tetrahydrochinoline, 1,2,3,4- tetrahydrochinoxaline, 2,3-dehydrobenzol,4-oxazine, 2,3-dehydro-indole or dihydrobenzo- pyrrolodiazepine.
  • R 3 is a substituted or unsubstituted C 3 -C 8 -heterocyclalkyl group fused to a substituted or unsubstituted aryl group and to a substituted or unsubstituted heteroaryl group (e.g.dihydrobenzopyrrolodiazepine).
  • R 3 is a substituted or unsubstituted alkyl group (e.g. isopropyl).
  • the substituents at R 2 or R 3 are selected from the group consisting of Ct-C ⁇ -alkyl, alkoxy, cyano, amino and halogen (e.g. methyl, ethyl, butyl, tert.- butyl, methoxy, ethoxy, tert.-butoxy, phenoxy, chloro, fluoro); wherein alkyl, alkoxy or aryloxy are optionally substituted with halogen (e.g. trifluoromethyl, trifluoromethoxy);
  • Another specific sub-group of formula (I) are compounds having formula (T), whereby A, B, R 2 and R 3 are defined as above and each R 1 can be independently hydrogen or substituted or unsubstituted Ci-C ⁇ -alkyl. In a preferred embodiment, R 1 is hydrogen.
  • a specific sub-group of formulae (I ) and (F) are compounds having the formulae (Ia-Id), whereby A, R 2 and R 3 are defined as above and Z is O or S.
  • Preferred pharmaceutically acceptable salts of compounds of Formula I, and compounds of sub-groups of Formulae (Ia) - (Id) containing a basic residue such as, for example, a primary, secondary, or tertiary amine or a pyridyl moiety are acid addition salts formed with pharmaceutically acceptable acids like hydrochloride, hydrobromide, sulfate or bisulfate, phosphate or hydrogen phosphate, acetate, benzoate, succinate, iumarate, maleate, lactate, citrate, tartrate, gluconate, methane-sulfonate, benzenesulfonate, aadpara- toluenesulfonate salts.
  • pharmaceutically acceptable acids like hydrochloride, hydrobromide, sulfate or bisulfate, phosphate or hydrogen phosphate, acetate, benzoate, succinate, iumarate, maleate, lactate, citrate, tartrate, gluconate,
  • the invention provides a pharmaceutical composition comprising a 2,3 substituted pyrazine sulfonamide according to Formula (I), together with a pharmaceutically acceptable excipient or carrier.
  • a 2,3 substituted pyrazine sulfonamide according to formulae (I) for the preparation of a medicament for the treatment and/or prevention of a disease selected from allergic diseases such as allergic asthma, allergic rhinitis, allergic conjunctivitis, systemic anaphylaxis or hypersensitivity responses, and inflammatory dermatoses such as atopic dermatitis, eczema, allergic contact dermatitis, and urticaria, myositis and other diseases with an inflammatory component such as rheumatoid arthritis, osteoarthritis, and inflammatory bowel disease (IBD) and other diseases and disorders associated with CTRH2 activity.
  • allergic diseases such as allergic asthma, allergic rhinitis, allergic conjunctivitis, systemic anaphylaxis or hypersensitivity responses
  • the invention provides a method for treating and/or preventing a patient suffering from a disease selected from allergic diseases such as allergic asthma, allergic rhinitis, allergic conjunctivitis, systemic anaphylaxis or hypersensitivity responses, and inflammatory dermatoses such as atopic dermatitis, eczema, allergic contact dermatitis, and urticaria, myositis, neurodegenerative disorders such as neuropatic pain, and other inflammatory diseases such as rheumatoid arthritis, multiple sclerosis, osteoarthritis, and inflammatory bowel disease (IBD) and other diseases and disorders associated with a disease selected from allergic diseases such as allergic asthma, allergic rhinitis, allergic conjunctivitis, systemic anaphylaxis or hypersensitivity responses, and inflammatory dermatoses such as atopic dermatitis, eczema, allergic contact dermatitis, and urticaria, myositis, neurodegenerative disorders such as neuropatic pain, and other inflammatory
  • preventing should be understood as partially or totally preventing, inhibiting, alleviating, or reversing one or more symptoms or cause(s) of allergic disease or inflammatory dermatitis.
  • the invention provides the use of a 2,3 substituted pyrazine sulfonamide of Formula (I) for the preparation of a pharmaceutical composition useiul for a variety of therapies, including preventing and/or treating a disease selected from allergic diseases such as allergic asthma, allergic rhinitis, allergic conjunctivitis, systemic anaphylaxis or hypersensitivity responses, and inflammatory dermatoses such as atopic dermatitis, eczema, allergic contact dermatitis, and urticaria, myositis, neurodegenerative disorders such as neuropatic pain, and other inflammatory diseases such as rheumatoid arthritis, multiple sclerosis, osteoarthritis, and inflammatory bowel disease (IBD) and other diseases and disorders associated with CTRH2 activity.
  • allergic diseases such as allergic asthma, allergic rhinitis, allergic conjunctivitis, systemic anaphylaxis or hypersensitivity responses
  • inflammatory dermatoses such as atopic dermatitis, ec
  • the invention provides further the use of a 2,3 substituted pyrazine sulfonamide of Formula
  • allergic diseases such as allergic asthma, allergic rhinitis, allergic conjunctivitis, systemic anaphylaxis or hypersensitivity responses
  • inflammatory dermatoses such as atopic dermatitis, eczema, allergic contact dermatitis, and urticaria, myositis, neurodegenerative disorders such as neuropatic pain, and other inflammatory diseases such as rhe
  • compositions and unit dosages thereof may be placed into the form of pharmaceutical compositions and unit dosages thereof, and in such form may be employed as solids, such as tablets or filled capsules, or liquids such as solutions, suspensions, emulsions, elixirs, or capsules filled with the same, all for oral use, or in the form of sterile injectable solutions for parenteral (including subcutaneous use).
  • Such pharmaceutical compositions and unit dosage forms thereof may comprise ingredients in conventional proportions, with or without additional active compounds or principles, and such unit dosage forms may contain any suitable effective amount of the active ingredient commensurate with the intended daily dosage range to be employed.
  • the compounds according to Formula (I) of the present invention are typically administered in form of a pharmaceutical composition.
  • Such compositions can be prepared in a manner well known in the pharmaceutical art and comprise at least one active compound.
  • the compounds of this invention are administered in a pharmaceutically effective amount.
  • the amount of the compound actually administered will typically be determined by a physician, in the light of the relevant circumstances, including the condition to be treated, the chosen route of administration, the actual compound administered, the age, weight, and response of the individual patient, the severity of the patient's symptoms, and the like.
  • compositions of these inventions can be administered by a variety of routes including oral, rectal, transdermal, subcutaneous, intravenous, intramuscular, and intranasal.
  • the compositions for oral administration can take the form of bulk liquid solutions or suspensions, or bulk powders. More commonly, however, the compositions are presented in unit dosage forms to facilitate accurate dosing.
  • unit dosage forms refers to physically discrete units suitable as unitary dosages for human subjects and other mammals, each unit containing a predetermined quantity of active material calculated to produce the desired therapeutic effect, in association with a suitable pharmaceutical excipient.
  • Typical unit dosage forms include prefilled, premeasured ampoules or syringes of the liquid compositions or pills, tablets, capsules or the like in the case of solid compositions.
  • the substituted methylene amide derivative according to the invention is usually a minor component (from about 0.1 to about 50% by weight or preferably from about 1 to about 40% by weight) with the remainder being various vehicles or carriers and processing aids helpful for forming the desired dosing form.
  • Liquid forms suitable for oral administration may include a suitable aqueous or nonaqueous vehicle with buffers, suspending and dispensing agents, colorants, flavors and the like.
  • Solid forms may include, for example, any of the following ingredients, or compounds of a similar nature: a binder such as microcrystalline cellulose, gum tragacanth or gelatine; an excipient such as starch or lactose, a disintegrating agent such as alginic acid, Primogel, or corn starch; a lubricant such as magnesium stearate; a glidant such as colloidal silicon dioxide; a sweetening agent such as sucrose or saccharin; or a flavoring agent such as pepper-mint, methyl salicylate, or orange flavoring.
  • a binder such as microcrystalline cellulose, gum tragacanth or gelatine
  • an excipient such as starch or lactose, a disintegrating agent such as alginic acid, Primogel, or corn starch
  • Injectable compositions are typically based upon injectable sterile saline or phosphate buffered saline or other injectable carriers known in the art.
  • substituted methylene amide derivatives of Formula (I) in such compositions is typically a minor component, frequently ranging between 0.05 to 10% by weight with the remainder being the injectable carrier and the like.
  • the compounds of this invention can also be administered in sustained release forms or from sustained release drug delivery systems.
  • sustained release materials can also be found in the incorporated materials in Remington's Pharmaceutical Sciences .
  • the invention provides novel 2,3 -substituted pyrazine sulfonamides of Formulae (Ia) - (Id) wherein A, R 2 , and R 3 are defined as described above.
  • Novel compounds of Formulae (Ia) - (Id) are in particular those of the group consisting of:
  • the invention provides a method of synthesis of a compound according to formula (Ia)-(Id).
  • the 2,3 substituted sulfonamides exemplified in this invention may be prepared from readily available starting materials using the following general methods and procedures. It will be appreciated that where typical or preferred experimental conditions (i.e. reaction temperatures, time, moles of reagents, solvents etc.) are given, other experimental conditions can also be used unless otherwise stated. Optimum reaction conditions may vary with the particular reactants or solvents used, but such conditions can be determined by the person skilled in the art, using routine optimisation procedures.
  • sulfonamide derivatives XXI wherein R 2 is defined as above is reacted with the 2,3-dichloropyrazine II to give the corresponding 3- chloropyrazine sulfonamide compounds III.
  • reaction conditions may be utilized for performing this first reaction step, e.g. by the use of sulfonamide derivative XXI in presence of a base such as cesium carbonate, potassium carbonate or the like.
  • This reaction may be performed in solvents like NMP, DMF or DMA at various temperature depending on the intrinsic reactivity of compounds XXI and II, by traditional thermic or microwawe method, using standard conditions well known to the person skilled in the art or shown in Scheme 2, below:
  • the sulfonamide derivatives XXI are obtained from commercial sources or can be prepared by treatment of the corresponding sulfonyl chlorides XX, using standard conditions well known to the person skilled in the art, with a solution of 2M ammonia in EtOH or dioxane at room temperature for lhour or using can be performed at various temperature depending on the intrinsic reactivity of compounds XXI, by traditional thermal method or using microwave technology, using standard conditions well known to the person skilled in the art or shown in the Scheme 3, below.
  • the 2,3-substituted pyrazine sulfonamide derivatives according to the general formula Ia may be obtained in 3 subsequent steps depending the availability of starting materials and building blocks.
  • a synthetic route is shown in Scheme 4.
  • the 2,3-substituted pyrazine sulfonamide derivatives IVa are isolated after condensation of the 3- chloropyrazine sulfonamide compounds III with the boronic acids XXII.
  • This reaction may be performed in presence of appropriated palladium catalysts such as palladium diacetate and in solvents like Dioxane, methanol or solution containing both solvents in various ratios.
  • This reaction can be performed at various temperatures depending on the intrinsic reactivity of compounds III, by traditional thermal method or using microwave technology, using standard conditions well known to the person skilled in the art.
  • the 2,3-substituted pyrazine sulfonamide derivatives Va are isolated after chlorination of intermediate compounds IVa in presence of thionyl chloride.
  • This reaction is usually performed at room temperature in solvents like dichloromethane, dichloroethane or DMF, using standard conditions well known to the person skilled in the art.
  • the 2,3-substituted pyrazine sulfonamide derivatives Va may be treated with various nucleophiles, e.g. an amine XXIV or alcohol XXV, wherein R 4 , R 5 , R 6 are independently selected from the group of hydrogen, alkyl, aryl, heteroaryl, cycloalkyl, heterocycloalkyl or fused ring systems of the mentioned to give the expected 2,3-substituted pyrazine sulfonamide derivative Ia.
  • nucleophiles e.g. an amine XXIV or alcohol XXV
  • the nucleophilic displacement of the chlorine atom of the benzylic moiety by the amine XXIV or the alcohol XXV is accomplished by treatment with an appropriated based such as sodium hydride or potassium tert-butoxide in anhydrous conditions, in presence or absence of e.g. sodium iodine or tetrabutylammonium iodine as catalyst in solvents such as DMF, THF or similar solvents.
  • This reaction can be performed at various temperatures depending on the intrinsic reactivity of compounds Va, XXIV and XXV, by traditional thermal method or using microwave technology, using standard conditions well known to the person skilled in the art.
  • the 2,3 -substituted pyrazine sulfonamide derivatives according to the general formula Ia may also be obtained in 3 subsequent steps depending the availability of starting materials and building blocks.
  • Another synthetic route is shown in Scheme 5.
  • the 2,3- substituted pyrazine sulfonamide derivatives FVb are isolated after condensation of the 3- chloropyrazine sulfonamide compounds III with the boronic acids XXIII.
  • This reaction may be performed in presence of appropriate palladium catalysts such as palladium diacetate and in solvents like Dioxane, methanol or a solution containing both solvents in various ratios.
  • This reaction can be performed at various temperatures depending on the intrinsic reactivity of compounds III, by traditional thermal method or using microwave technology, using standard conditions well known to the person skilled in the art.
  • the 2,3 -substituted pyrazine sulfonamide derivatives Vb whereby the substituent R 2 is as above defined, are isolated either after chlorination of intermediate compounds FVb in presence of oxalyl chloride or after treatment of compounds IVb with an appropriate coupling reagent such as DCC, HATU or Mukayama reagent in presence of a base like DIPEA or triethylamine.
  • an appropriate coupling reagent such as DCC, HATU or Mukayama reagent in presence of a base like DIPEA or triethylamine.
  • the 2,3 -substituted pyrazine sulfonamide derivative Vb may be treated with various nucleophiles, e.g. an amine XXIV, to give the expected 2,3 -substituted pyrazine sulfonamide derivative Ia.
  • the formation of the amide bond is accomplished by treatment with an appropriate base such as DIPEA or triethylamine, in solvents such as DMF, THF or similar solvents.
  • This reaction can be performed at various temperatures depending on the intrinsic reactivity of compounds Vb and XXIV, by traditional thermal method or using microwave technology, using standard conditions well known to the person skilled in the art.
  • the 2,3 -substituted pyrazine sulfonamide derivatives according to the general formula Ib may be obtained in 3 subsequent steps depending the availability of starting materials and building blocks.
  • a synthetic route is shown in Scheme 6.
  • the 2,3 -substituted pyrazine sulfonamide derivatives Via are isolated after condensation of the 3- chloropyrazine sulfonamide compounds III with the boronic acids XXVI.
  • This reaction may be performed in presence of appropriate palladium catalysts such as palladium diacetate and in solvents like Dioxane, methanol or a solution containing both solvents in various ratios.
  • This reaction can be performed at various temperatures depending on the intrinsic reactivity of compounds III, by traditional thermal method or using microwave technology, using standard conditions well known to the person skilled in the art.
  • the 2,3-substituted pyrazine sulfonamide derivatives Vila whereby the substituent R 2 is as above defined, are isolated after chlorination of intermediate compounds Via in presence of thionyl chloride.
  • This reaction is usually performed at room temperature in solvents like dichloromethane, dichloroethane or DMF, using standard conditions well known to the person skilled in the art.
  • the 2,3 -substituted pyrazine sulfonamide derivatives Vila may treated with various nucleophiles, e.g. an amine XXIV or alcohol XXV, to give the expected 2,3-substituted pyrazine sulfonamide derivative Ib.
  • nucleophilic displacement of the chlorine atom of the benzylic moiety by the amine XXIV or the alcohol XXV is accomplished by treatment with an appropriate base such as sodium hydride or potassium tert-butoxide under anhydrous conditions, in presence or absence of e.g.
  • the 2,3 -substituted pyrazine sulfonamide derivatives according to the general formula Ib may also be obtained in 3 subsequent steps depending the availability of starting materials and building blocks.
  • Another synthetic route is shown in Scheme 7.
  • the 2,3- substituted pyrazine sulfonamide derivatives VIb are isolated after condensation of the 3- chloropyrazine sulfonamide compounds III with the boronic acids XXVII.
  • This reaction may be performed in presence of appropriate palladium catalysts such as palladium diacetate and in solvents like Dioxane, methanol or a solution containing both solvents in various ratios.
  • This reaction can be performed at various temperatures depending on the intrinsic reactivity of compounds III, by traditional thermal method or using microwave technology, using standard conditions well known to the person skilled in the art.
  • the 2,3 -substituted pyrazine sulfonamide derivatives VIIb whereby the substituent R 2 is as above defined, are isolated either after chlorination of intermediate compounds VIb in presence of oxalyl chloride or after treatment of compounds VIb with an appropriate coupling reagent such as DCC, HATU or Mukayama reagent in presence of a base like DIPEA or triethylamine.
  • an appropriate coupling reagent such as DCC, HATU or Mukayama reagent in presence of a base like DIPEA or triethylamine.
  • the 2,3-substituted pyrazine sulfonamide derivatives VIIb may be treated with various nucleophiles, e.g. an amine XXIV, to give the expected 2,3-substituted pyrazine sulfonamide derivatives Ib.
  • the formation of the amide bond is accomplished by treatment with an appropriate base such as DIPEA or triethylamine, in solvents such as DMF, THF or similar solvents.
  • This reaction can be performed at various temperatures depending on the intrinsic reactivity of compounds VIIb and XXIV, by traditional thermal method or using microwave technology, using standard conditions well known to the person skilled in the art.
  • the 2,3 -substituted pyrazine sulfonamide derivatives according to the general formula Ic may be obtained in 3 subsequent steps depending the availability of starting materials and building blocks.
  • a synthetic route is shown in Scheme 8.
  • the 2,3 -substituted pyrazine sulfonamide derivatives Villa are isolated after condensation of the 3- chloropyrazine sulfonamide compounds III with the acetylene XXVIII.
  • This reaction may be performed in the presence of appropriate palladium catalysts such as palladium triphenyl phosphine tetrakis or Pd(Ph 3 ) 2 Cl 2 in presence of cupper iodine and potassium acetate, in solvents like Dioxane, DMF or a solution containing both solvents in various ratios.
  • This reaction can be performed at various temperatures depending on the intrinsic reactivity of compounds III, by traditional thermal method or using microwave technology, using standard conditions well known to the person skilled in the art.
  • the 2,3 -substituted pyrazine sulfonamide derivatives DCa may be treated with various nucleophiles, e.g. an amine XXIV or alcohol XXV, to give the expected 2,3 -substituted pyrazine sulfonamide derivatives Ic.
  • nucleophilic displacement of the chlorine atom of the benzylic moiety by the amine XXIV or the alcohol XXV is accomplished by treatment with an appropriate base such as sodium hydride or potassium tert-butoxide under anhydrous conditions, in presence or absence of e.g.
  • the 2,3 -substituted pyrazine sulfonamide derivatives according to the general formula Ic may also be obtained in 3 subsequent steps depending the availability of starting materials and building blocks.
  • Another synthetic route is shown in Scheme 9.
  • the 2,3- substituted pyrazine sulfonamide derivatives VIIIb are isolated after condensation of the 3- chloropyrazine sulfonamide compounds III with the acetylene XXIX.
  • This reaction may be performed in the presence of appropriate palladium catalysts such as palladium triphenyl phosphine tetrakis or Pd(Ph 3 ) 2 Cl 2 in presence of cupper iodine and potassium acetate, in solvents like Dioxane, DMF or a solution containing both solvents in various ratios.
  • This reaction can be performed at various temperatures depending on the intrinsic reactivity of compounds III, by traditional thermal method or using microwave technology, using standard conditions well known to the person skilled in the art.
  • the 2,3 -substituted pyrazine sulfonamide derivatives IXb whereby the substituent R 2 is as above defined, are isolated either after chlorination of intermediate compounds VIIIb in the presence of oxalyl chloride or after treatment of compounds VIIIb with an appropriate coupling reagent such as DCC, HATU or Mukayama reagent in presence of a base like DIPEA or triethylamine.
  • an appropriate coupling reagent such as DCC, HATU or Mukayama reagent in presence of a base like DIPEA or triethylamine.
  • the 2,3-substituted pyrazine sulfonamide derivatives IXb may be treated with various nucleophiles, e.g. an amine XXIV, to give the expected
  • the 2,3 -substituted pyrazine sulfonamide derivatives according to the general formula Id may be obtained in 3 subsequent steps depending the availability of starting materials and building blocks.
  • a synthetic route is shown in Scheme 10.
  • the 2,3 -substituted pyrazine sulfonamide derivatives X are isolated after condensation of the 3-chloropyrazine sulfonamide compounds III with the piperazine-1-carboxylic acid tert-butyl ester XXX.
  • This reaction may be performed in presence of an appropriate base such as DIPEA or triethylamine, in solvents like NMP, DMF or a solution containing both solvents in various ratios.
  • This reaction can be performed at various temperatures depending on the intrinsic reactivity of compounds III, by traditional thermal method or using microwave technology, using standard conditions well known to the person skilled in the art.
  • the 2,3 -substituted pyrazine sulfonamide derivatives XI whereby the substituent R 2 is deprotected under acidic conditions using either TFA or HCl solution at different concentrations.
  • This reaction is usually performed at room temperature in solvents like dichloromethane, dichloroethane or DMF, using standard conditions well known to the person skilled in the art.
  • the 2,3-substituted pyrazine sulfonamide derivatives X may be treated either with various electrophiles, e.g.
  • an alkyl halide XXXIa in the presence of an appropriate base such as Cs 2 CO 3 , DIPEA or triethylamine, or also with an acyl chloride or a carboxylic acid XXXIb initially preactivated by treatment with an appropriate coupling reagent such as DCC, Mukayama reagent, PyBrop, in order to give the expected 2,3-substituted pyrazine sulfonamide derivative Id.
  • an appropriate coupling reagent such as DCC, Mukayama reagent, PyBrop
  • the nucleophilic displacement of the halide atom or the formation of the amide bond respectively, with the alkyl halide XXXIa or acyl chloride or carboxylic acid XXXIb can be performed at various temperatures depending on the intrinsic reactivity of compounds XI, XXXIa or XXXIb, by traditional thermal method or using microwave technology, using standard conditions well known to the person skilled in the art.
  • HPLC High Performance Liquid Chromatography
  • FC Flash Chromatography on silica gel
  • MS Mass Spectrometry
  • NMR Nuclear Magnetic Resonance
  • PBS Phosphate Buffered Saline
  • SPA Scintillation Proximity Assay
  • TLC Thin Layer Chromatography
  • UV Ultraviolet
  • compositions of this invention can be isolated in association with solvent molecules by crystallization from evaporation of an appropriate solvent.
  • the pharmaceutically acceptable acid addition salts of the compounds of Formula (I), which contain a basic center may be prepared in a conventional manner.
  • a solution of the free base may be treated with a suitable acid, either neat or in a suitable solution, and the resulting salt isolated either by filtration or by evaporation under vacuum of the reaction solvent.
  • Pharmaceutically acceptable base addition salts may be obtained in an analogous manner by treating a solution of compound of Formula (I) with a suitable base. Both types of salts may be formed or interconverted using ion-exchange resin techniques.
  • HPLC column Waters Symmetry C8 50 x 4.6 mm, Conditions: MeCN/H 2 O, 5 to 100% (8 min), max plot 230 ⁇ 00 nm; Mass spectra: PE-SCIEX API 150 EX (APCI and ESI), LC/MS spectra: Waters ZMD (ES); 1 H-NMR: Bruker DPX-300MHz.
  • the preparative HPLC purifications are performed with HPLC Waters Prep LC 4000 System equipped with columns Prep Nova-Pak ® HR C 186 ⁇ m 6 ⁇ A, 40x30mm (up to lOOmg) or with XTerra ® Prep MS C8, 10 ⁇ m, 50x300mm (up to Ig). AU the purifications are performed with a gradient of MeCNZH 2 O 0.09% TFA.
  • the semi-preparative reverse- phase HPLC are performed with the Biotage Parallex Flex System equipped with columns SupelcosilTM ABZ+Plus (25 cm x 21.2 mm, 12 ⁇ m); UV detection at 254 nm and 220 nm; flow 20 mL/min (up to 50 mg). TLC Analysis is performed on Merck Precoated 60 F 254 plates. Purifications by flash chromatography are performed on SiO 2 support, using cyclohexane/EtOAc or DCM/MeOH mixtures as eluents.
  • N-(3-chloropyrazin-2-yl)-2-(trifluoromethyl)benzenesulfonamide (1.35g; 4.0 mmol; 1.00 eq.) and 2-propyn-l-ol (336mg; 6.0 mmol; 1.5 eq.) were dissolved in 1OmL of DMF under nitrogen atmosphere.
  • To the reaction mixture was added CH 3 COOK (588mg; 6.0 mmol; 1.5 eq.) and Pd(PPh 3 ) 4 (232 mg; 0.2 mmol) under nitrogen. The reaction mixture was then heated at 100 0 C under nitrogen for 2hours.
  • Method B N-(3-chloropyrazin-2-yl)-2-(trifluoromethyl)benzenesulfonamide (1.35g; 4.0 mmol; 1.00 eq.) and 2-propyn-l-ol (336mg 6.0 mmol; 1.5 eq.) were dissolved in 1OmL of DMF under nitrogen atmosphere. To the reaction mixture was added CH 3 COOK (588mg; 6.0 mmol; 1.5 eq.) CuI (40mg; 0.2 mmol; 0.05 eq.) and Pd(PPh 3 ) 2 Cl 2 (28mg; 0.04 mmol) under nitrogen. The reaction mixture was then heated at 100 0 C under nitrogen for 2hours.
  • Example 1 General procedure for the synthesis of 2.3-substituted pyrazine sulfonamide derivatives of general formula L with A and Z as above defined (Schemes 1, 4, 5, 6, 7, 8, 9 and 10): N- ⁇ 3 - ⁇ 4-( 1 H-indol- 1 -ylmethyl)phenyl1pyrazin-2-yl
  • Example 14j 4-methyl-N- ⁇ 3-F4-( ⁇ methvir4-(trifluoromethoxy)phenyl1amino I - methyl)phenyl1pyrazin-2-yl
  • Example 15 4-chloro-N-r3-(4- ⁇ rmethyl(phenyl)amino1methyl
  • Example 16 4-cyano-N- ⁇ 3-F4-( ⁇ methvir4-(trifluoromethoxy)phenyl1amino I - methyl)phenyl1pyrazin-2-yl
  • Example 25 N- ⁇ 3 -r4-(2-Pyridin-2-yl-indol- 1 -ylmethyl)-phenyl1-pyrazin-2-yl
  • Example 37 N-[3-(4- ⁇ [(2.4-Dichloro-phenylVmethyl-amino]-methyl
  • a 2,3 -substituted pyrazine sulfonamide derivative of formula I is admixed as a dry powder with a dry gelatin binder in an approximate 1:2 weight ratio.
  • a minor amount of magnesium stearate is added as a lubricant.
  • the mixture is formed into 240-270 mg tablets (80-90 mg of active 2,3-substituted pyrazine sulfonamide compound per tablet) in a tablet press.
  • Formulation 2 Capsules
  • a 2,3 -substituted pyrazine sulfonamide derivative of formula I is admixed as a dry powder with a starch diluent in an approximate 1:1 weight ratio. The mixture is filled into 250 mg capsules (125 mg of active 2,3-substituted pyrazine sulfonamide compound per capsule).
  • a 2,3-substituted pyrazine sulfonamide derivative of formula I (1250 mg), sucrose (1.75 g) and xanthan gum (4 mg) are blended, passed through a No. 10 mesh U.S. sieve, and then mixed with a previously prepared solution of microcrystalline cellulose and sodium carboxymethyl cellulose (11:89, 50 mg) in water.
  • Sodium benzoate (10 mg) flavor, and color are diluted with water and added with stirring. Sufficient water is then added to produce a total volume of 5 ml.
  • a 2,3-substituted pyrazine sulfonamide derivative of formula I is admixed as a dry powder with a dry gelatin binder in an approximate 1:2 weight ratio. A minor amount of magnesium stearate is added as a lubricant. The mixture is formed into 450-900 mg tablets (150-300 mg of active 2,3-substituted pyrazine sulfonamide compound) in a tablet press.
  • a 2,3-substituted pyrazine sulfonamide derivative of formula (I) is dissolved in a buffered sterile saline injectable aqueous medium to a concentration of approximately 5 mg/ml.
  • Example 48 Construction of pCEP4-hCRTH2 mammalian expression vector
  • Human CRTH2 cDNA was amplified by PCR using a human urinary bladder cDNA library as a template and specific primers containing HindIII and BamHI restriction sites for cloning into the pCEP4 vector (Invitrogen). The vector construction is described in detail in Sawyer et al., Br. J. Pharmocol 2002, 137, 1163-72. The nucleotide sequence of the cloned cDNA was identical the previously reported hCRTH2 sequence (Nagata et al, 1999, J. Immunol. 162, 1278-1286).
  • Example 49 Establishment of a pCEP4-hCRTH2-HEK293 (EBNA) cell line
  • HEK293 (EBNA) cells were transfected with the pCEP4-hCRTH2 construct using the calcium phosphate technique.
  • Cells were maintained in culture at 37°C in an atmosphere of 5% CO 2 in Dulbecco's modified Eagle's F12 medium (Invitrogen), containing 10% heat- inactivated foetal calf serum (TerraCell International, Canada), 2mM Glutamine, lOOunits/ml of penicillin and lOO ⁇ g/ml streptomycin (Invitrogen).
  • Invitrogen Dulbecco's modified Eagle's F12 medium
  • 2mM Glutamine lOOunits/ml of penicillin and lOO ⁇ g/ml streptomycin
  • Adherent HEK293 (EBNA) cells expressing hCRTH2 were cultured in 225 cm 2 cell culture flasks (Corning, USA) in 30ml of medium. After two rinses of phosphate buffered saline (PBS), cells were harvested in 10ml of PBS containing ImM EDTA, centriftiged at 500 x g for 5 min at 4°C and frozen at -80 0 C. The pellet was re-suspended in 50 mM Tris-HCl, pH 7.4, 2mM EDTA, 25OmM Sucrose, containing protease inhibitor cocktail tablets, (Complete EDTA-free, Roche, Germany) and incubated 30 min at 4°C.
  • PBS phosphate buffered saline
  • the compounds of the present invention inhibit the binding of PGD2 to its receptor CRTH2.
  • the inhibitory activity can be investigated by a radioligand binding assay (Sawyer et al., Br. J. Pharmocol 2002, 137, 1163-72).
  • the radioligand binding assay was performed at room temperature in binding buffer (1OmM HEPES/KOH pH 7.4, 1OmM MnCl 2 , with protease inhibitor cocktail tablets), containing 1.5nM [ 3 H]PGD 2 (Amersham, 156 Cie/mmol), and lO ⁇ g of hCRTH2 HEK293 (EBNA) cell membrane protein in a final volume of lOO ⁇ l in 96 well plates (Corning, USA).
  • Non-specific binding was determined in the presence of l ⁇ M PGD 2 (Cayman, USA). Competing pyrazine sulfonamides were diluted in dimethylsulphoxide so that the totale volume of dimethylsulfoxide was kept constant at 1% dimethylsulphoxide (Me 2 SO). 10 ⁇ l of the pyrazine sulfonamides were added. Incubation (60min at room temperature) was terminated by rapid filtration through 96 wells hydrophobic GF/C Unifilter plates (Whatman, USA).
  • the pyrazine sulfonamides of the present invention inhibit CRTH2 at a concentration of ⁇ 100 ⁇ M. In another embodiment, the pyrazine sulfonamides of the present invention inhibit CRTH2 at a concentration of ⁇ 10 ⁇ M. In a preferred embodiment, the pyrazine sulfonamides of the present invention inhibit CRTH2 at a concentration of ⁇ 5 ⁇ M. In a further preferred embodiment, the pyrazine sulfonamides of the present invention inhibit CRTH2 at a concentration of ⁇ 1 ⁇ M.
  • Ki values are shown in Table 2. It can be derived that said compounds according to Formula I showed a significant inhibition of the binding of PGD2 to CRTH2.
  • the [ 35 S]GTP ⁇ S assay measures the increase in guanine nucleotide exchange at G-proteins in cell membranes, resulting from agonist (PGD2) binding to CRTH2. This process can be monitored in vitro by incubating cell membranes containing G-proteins and CRTH2 with GDP and [ 35 S]GTP ⁇ S, a radiolabeled, hydrolysis-resistant analogue of GTP (see, Harrison et al., Life Sciences 74, 489-508, 2003). The addition of a pyrazine sulfonamide results in binding to CRTH2 and thus in an inhibition of agonist binding, which can be monitered as inhibition of the stimulation of GTP/GDP exchange.
  • Assay conditions were identical to conditions of radioligand binding assay as described in Example 21.
  • the [ 35 S]GTPyS binding assay was performed at 30 0 C with gentle agitation in 96-well scintillating white polystyrene plates (Perkin Elmer, USA), in a final volume of 200 ⁇ l, containing 2% of dimethylsulphoxide (Me 2 SO).
  • the 2,3 substituted pyrazine sulfonamides were incubated in 2OmM HEPES/KOH pH 7.4, 1OmM MgCl 2 , lO ⁇ g/ml Saponin, 3 ⁇ M GDP, 15OmM NaCl containing lO ⁇ g of membranes expressing the hCRTH2 receptor (Euroscreen, Belgium) for 10 min. Non-specific binding was determined in the presence of lO ⁇ M of GTP ⁇ S. Samples were incubated for 30 min in the presence of increasing concentrations OfPGD 2 for the determination of agonist activity, or with 8OnM OfPGD 2 for determination of antagonist activity, respectively.
  • the concentration of membranes and radioactive ligand, as well as the positive and negative controls were identical to the conditions used and described aboveExamples 21 and 22.
  • the compound of Example 1 showed an IC50 value of 1.9 ⁇ M.
  • the compound of Example 2 showed an IC50 value of 4.6 ⁇ M and the compound of Example 3 showed an IC50 value of l.4 ⁇ M.
  • the contact hypersensitivity model can be used to evaluate the therapeutic efficacy of 2, 3- substituted pyrazine sulfonamides on skin inflammation mediated by T cells.
  • the model is well established for characterization of compound for dermatological indications like psoriasis and allergic contact dermatitis (Xu et al. J Exp Med. 183, 1001-12, 1996). It involves a sensitization phase and a subsequent challenge with an antigen (DNFB, 2,4- dinitrofluorbenzene). This results in skin inflammation with formation of edema and cellular infiltrates in the skin. The edema can be measured by caliper at the challenged site (ear of the mice).
  • Intravenous administration of the compounds of the invention 30 min before challenge with DNFB results in a decrease of the swelling and therefore reduces inflammation in the skin compared to positive controls treated with vehicle only before challenge with the antigen.
  • Negative control mice are not sensitized, but challenged with DNFB, therefore no T cell dependent inflammation occurs and no edema is formed.
  • Balb/c mice are obtained from CharlesRiver (Calcco, Italy). Animals are housed in a conventional animal facility. Treatment starts at an average age of 8 - 12 weeks.
  • DNFB 2,4-dinitrofluorbenzene
  • mice are sensitized and challenged to elicit CHS to DNFB.
  • the sensitization phase is followed by a challenge phase.
  • DNFB is diluted in acetone/olive oil (4/1) immediately before use.
  • Mice are sensitized to DNFB by applying 25 ⁇ l of 0.5%DNFB solution onto the shaved dorsal skin. Five days later, 10 ⁇ l of 0.2% DNFB are applied onto both sides of the right ear (challenge). Ear thickness is monitored on day 6 (1 day after challenge) using a caliper (Mitutoyo, Milan, Italy). Ear swelling is calculated as ((Tn-T5)right ear - (Tn- T5)left ear), wherein Tn and T5 represent values of ear thickness at day n of investigation and day 5 prior to challenge, respectively.

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Abstract

The present invention is related to the use of 2,3 substituted pyrazine sulfonamides of formula (I) for the treatment and/or prevention of allergic diseases, inflammatory dermatoses and other diseases with an inflammatory component. Specifically, the present invention is related to the use of 2,3 substituted pyrazine sulfonamides for the modulation, notably the inhibition, of CRTH2 activity.

Description

2,3 SUBSTITUTED PYRAZINE SULFONAMIDES
FIELD OF THE INVENTION
The present invention relates to 2,3 substituted pyrazine sulfonamides for use as pharmaceutical active compounds, as well as pharmaceutical formulations containing such
2,3 substituted pyrazine sulfonamides. Said derivatives are useiul for the treatment and/or prevention of allergic diseases and inflammatory dermatoses. Specifically, the present invention is related to the use of 2,3 substituted pyrazine sulfonamides for the modulation, notably the inhibition of CRTH2 activity. The present invention furthermore relates to novel 2,3 substituted pyrazine sulfonamides as well as methods of their preparation.
BACKGROUND OF THE INVENTION
Prostaglandin D2 (PGD2) has long been associated with inflammatory and atopic conditions, specifically allergic diseases such as asthma, rhinitis and atopic dermatitis (Lewis et al. (1982) J. Immunol. 129, 1627). PGD2 belongs to a class of compounds derived from the 20-carbon fatty acid skeleton of arachidonic acid. In response to an antigen challenge, PGD2 is released in large amounts into the airway as well as to the skin during an acute allergic response. The DP receptor, which is a member of the G-protein coupled receptor (GPCR) subfamily, has long been thought to be the only receptor of PGD2. DP's role in allergic asthma has been demonstrated with DP deficient mice (Matsuoka et al. (2000) Science 287, 2013-2017). However, despite intense interest in the role of PGD2 in the inflammatory response, a direct link between DP receptor activation and PGD2-stimulated eosinophil migration has not been established (Woodward et al. (1990) Invest. Ophthalomol Vis. Sci. 31, 138-146; Woodward et al. (1993) Eur. J. Pharmacol. 230, 327-333). More recently, another G-protein coupled receptor, referred to as "Chemoattractant Receptor-Homologous molecule expressed on T-Helper 2 cells" (CRTH2) (Nagata et al. (1999) J. Immunol. 162, 1278-1286, Hirai et al. (2001) J Exp. Med. 193, 255-261) has recently been identified as a receptor for PGD2 and this discovery has begun to shed light on the mechanism of action of PGD2. CRTH2, which is also referred to as DP2, GPR44 or DLIR, shows little structural similarity with the DP receptor and other prostanoid receptors. However, CRTH2 possesses similar affinity for PGD2. Among peripheral blood T lymphocytes, human CRTH2 is selectively expressed on Th2 cells and is highly expressed on cell types associated with allergic inflammation such as eosinophils, basophiles and Th2 cells. In addition, CRTH2 mediates PGD2 dependent cell migration of blood eosinophils and basophiles. Furthermore, increased numbers of circulating T cells expressing CRTH2 have been correlated with the severity of atopic dermatitis (Cosmi et al. (2000) Eur. J. Immunol. 30, 2972-2979). The interaction of CRTH2 with PGD2 plays a critical role in the allergen-induced recruitment of Th2 cells in the target tissues of allergic inflammation. Compounds that inhibit the binding of CRTH2 and PGD2 should therefore be useful for the treatment of allergic diseases.
Allergic disease, like asthma, and inflammatory dermatoses represent a major class of complex, and typically chronic, inflammatory diseases that currently affect about 10% of the population and that number appears to be increasing (Bush, R.K., Georgitis J.W., Handbook of asthma and rhinitis. 1st ed. (1997), Abingdon: Blackwell Science. 270). Atopic dermatitis is a chronic skin disease, wherein the skin becomes extremely itchy. It accounts for 10 to 20 percent of all visits to dermatologists. The increasing incidence of allergic diseases and inflammatory dermatoses worldwide underscores the need for new therapies to effectively treat or prevent these diseases. Currently, numerous classes of pharmaceutical agents are widely used to treat these diseases, for example, antihistamines, decongestants, anticholinergics, methylxanthines, cromolyns, corticosteroids, and leukotriene modulators. However, the usefulness of these agents is often limited by side effects and low efficacy. It has been reported recently that 3-sulphur-substituted indole derivatives (A) exhibit CRTH2 activity (WO 04/106302, AstraZeneca AB) and are potentially useful for the treatment of various respiratory diseases.
Figure imgf000004_0001
WO 04/096777 (Bayer Healthcare AG) relates to pyrimidine derivatives, which are useful for the treatment of diseases mediated by CRTH2.
Figure imgf000004_0002
WO 04/035543 and WO 05/102338 (Warner-Lambert Company LLC) disclose tetrahydrochinoline derivatives as CRTH2 antagonists (C), which are also described to be effective in the treatment of neuropatic pain.
Figure imgf000004_0003
Specific tetrahydrochinoline derivatives as CRTH2 modulators are also provided by WO 04/032848 (Millennium Pharmaceutical Inc.) and WO 05/007094 (Tularik Inc.). These tetrahydrochinoline derivatives are said to be useful for treating disorders associated with allergic inflammation processes.
Other subfamilies of G protein-coupled receptor, namely CCR' s and CXCR' s, have been discussed as potential drug targets for the treatment of allergic diseases and autoimmune pathologies. WO 04/108692 and WO 04/108717 (AstraZeneca AB) disclose pyrazine sulfonamide compounds that modulate specifically CCR4.
Figure imgf000005_0001
Pyrazine sulfonamide compounds have also been disclosed in WO 04/058265 as compounds that interact with G protein-coupled receptors.
(E)
Figure imgf000005_0002
SUMMARY OF THE INVENTION
One aspect of the present invention consists in the use of 2,3 substituted pyrazine sulfonamides represented by the general formula (I) as pharmaceutical active compounds. Such compounds are suitable for the treatment and/or prevention of allergic disease and inflammatory dermatoses. Said compounds modulate a specific member of the G protein- coupled family, namely CRTH2. Specifically, the invention relates to 2,3 substituted pyrazine sulfonamides of Formula (I):
Figure imgf000006_0001
wherein A, B, R1, R2, R3 and m are defined as described in the detailed description below, for use as a medicament.
The invention iurther provides a pharmaceutical composition comprising a compound of Formula (I), together with a pharmaceutically acceptable excipient or carrier.
The invention further relates to the use of compounds of Formula I for the preparation of a medicament for the treatment and/or prevention of diseases selected from allergic diseases such as allergic asthma, allergic rhinitis, allergic conjunctivitis, systemic anaphylaxis or hypersensitivity responses, and inflammatory dermatoses such as atopic dermatitis, eczema, allergic contact dermatitis, and urticaria, myositis, neurodegenerative disorders such as neuropatic pain, and other inflammatory diseases such as rheumatoid arthritis, multiple sclerosis, osteoarthritis, and inflammatory bowel disease (IBD) and other diseases or disorders associated with CTRH2 activity. Specifically the present invention is related to the use of compounds of Formula I for the modulation, notably the inhibition of CRTH2 activity.
The invention further relates to a method for treating and/or preventing a patient suffering from a disease selected from allergic diseases such as allergic asthma, allergic rhinitis, allergic conjunctivitis, systemic anaphylaxis or hypersensitivity responses, and inflammatory dermatoses such as atopic dermatitis, eczema, allergic contact dermatitis, and urticaria, myositis, neurodegenerative disorders such as neuropatic pain, and other inflammatory diseases such as rheumatoid arthritis, multiple sclerosis, osteoarthritis, and inflammatory bowel disease (IBD) and other diseases and disorders associated with CTRH2 activity, by administering a compound according to Formula (I).
The invention further relates to the use of compounds of Formula I for the preparation of a pharmaceutical composition.
The invention finally relates to novel compounds of Formula I as well as to methods to synthesize these molecules.
DESCRIPTION OF THE INVENTION
The following paragraphs provide definitions of various chemical moieties that make up the compounds according to the invention and are intended to apply uniformly through-out the specification and claims unless an otherwise expressly set out definition provides a broader definition.
"C1-C6 -alkyl" refers to monovalent alkyl groups having 1 to 6 carbon atoms. This term is exemplified by groups such as methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert- butyl, n-hexyl and the like.
"Aryl" refers to an unsaturated aromatic carbocyclic group of from 6 to 14 carbon atoms having a single ring (e.g. phenyl) or multiple condensed rings (e.g. naphthyl). Preferred aryl include phenyl, naphthyl, phenantrenyl and the like. The aryl ring may be also fused to a heterocycloalkyl group. Such fused aryls include dihydrobenzimidazole-2-one, benzo[l,3]dioxole and the like.
"Ci-Cό-alkyl aryl" refers to d-Cό-alkyl groups having an aryl substituent, such as, for example, benzyl, phenethyl and the like.
"Heteroaryl" refers to a monocyclic heteroaromatic, or a bicyclic or a tricyclic fused-ring heteroaromatic group. Particular examples of heteroaromatic groups include optionally substituted pyridyl, pyrrolyl, pyrimidinyl, furyl, thienyl, imidazolyl, oxazolyl, isoxazolyl, thiazolyl, isothiazolyl, pyrazolyl, 1,2,3-triazolyl, 1,2,4-triazolyl, 1,2,3-oxadiazolyl, 1,2,4- oxadiazolyl, 1,2,5-oxadiazolyl, l,3,4-oxadiazolyl,l,3,4-triazinyl, 1,2,3-triazinyl, 1,3,4- thiadiazolyl, benzofuryl, [2,3-dihydro]benzofuryl, isobenzofuryl, benzothienyl, benzotriazolyl, isobenzothienyl, indolyl, isoindolyl, 3H-indolyl, benzimidazolyl, imidazo[l,2-a]pyridyl, benzothiazolyl, benzoxazolyl, quinolizinyl, quinazolinyl, pthalazinyl, quinoxalinyl, cinnnolinyl, napthyridinyl, pyridazinyl, pyrido[3,4-b]pyridyl, pyrido[3,2-b]pyridyl, pyrido[4,3-b]pyridyl, quinolyl, isoquinolyl, tetrazolyl, 5,6,7,8- tetrahydroquinolyl, 5,6,7,8-tetrahydroisoquinolyl, purinyl, pteridinyl, carbazolyl, xanthenyl or benzoquinolyl and the like.
"Ct-Cό-alkyl heteroaryl" refers to Ct-Cό-alkyl groups having a heteroaryl substituent, such as, for example, 2-furylmethyl, 2-thienylmethyl, 2-(lH-indol-3-yl)ethyl and the like.
"C3-C8-cycloalkyl" refers to a saturated carbocyclic group of from 3 to 8 carbon atoms having a single ring (e.g., cyclohexyl) or multiple condensed rings (e.g., norbornyl). Preferred cycloalkyl include cyclopentyl, cyclohexyl, norbornyl and the like.
"C3-C8-heterocycloalkyl" refers to a C3-C8-cycloalkyl group according to the definition above, in which up to 3 carbon atoms are replaced by heteroatoms chosen from the group consisting of O, S, NR, R being defined as hydrogen or methyl. Preferred heterocycloalkyl include pyrrolidine, piperidine, piperazine, 1-methylpiperazine, morpholine, and the like. "Ct-Cό-alkyl cycloalkyl" refers to d-Cό-alkyl groups having a cycloalkyl substituent, including cyclohexylmethyl, cyclopentylpropyl, and the like.
"CrCό-alkyl heterocycloalkyl" refers to d-Cό-alkyl groups having a heterocycloalkyl substituent, including 2-(l-pyrrolidinyl)ethyl, 4-moφholinylmethyl, (l-methyl-4- piperidinyl)methyl and the like.
"C2-C6-alkenyl" refers to alkenyl groups preferably having from 2 to 6 carbon atoms and having one or more sites of alkenyl unsaturation. Preferred alkenyl groups include ethenyl (-CH=CH2), n-2-propenyl (allyl, -CH2CH=CH2) and the like.
"C2-C6-alkynyl" refers to alkynyl groups preferably having from 2 to 6 carbon atoms and having one or more sites of alkynyl unsaturation. Preferred alkynyl groups include ethynyl (-C≡CH), propynyl (-CH2C=CH), and the like.
"Carboxy refers to the group -C(O)OR, where R includes hydrogen or "d-Ce-alkyl".
"Acyl" refers to the group -C(O)R where R includes "d-Ce-alkyl", "aryl", "heteroaryl", "C3-C8-cycloalkyl", "C3-C8-heterocycloalkyl", "d-Ce-alkyl aryl" or "d-Ce-alkyl heteroaryl".
"Acyloxy" refers to the group -OC(O)R where R includes "d-Ce-alkyl", "aryl", "heteroaryl", "Ci-C6-alkyl aryl" or "Ci-C6-alkyl heteroaryl".
"Aryl acyl" refers to aryl groups having an acyl substituent, including 2-acetylphenyl and the like.
"Heteroaryl acyl" refers to heteroaryl groups having an acyl substituent, including 2- acetylpyridyl and the like.
"Alkoxy" refers to the group -O-R where R includes "d-Ce-alkyl", "C2-C6-alkenyl", "C2- C6-alkynyl", "C3-C8-cycloalkyl", "heterocycloalkyl", "aryl", "heteroaryl", "d-Ce-alkyl aryl" or "d-Ce-alkyl heteroaryl", "C2-C6-alkenyl aryl", "C2-C6-alkenyl heteroaryl", "C2- C6-alkynyl aryl", "C2-C6-alkynylheteroaryl", "d-Ce-alkyl cycloalkyl", "d-Ce-alkyl heterocycloalkyl". Preferred alkoxy groups include by way of example, methoxy, ethoxy, phenoxy and the like.
"Ct-Cό-alkyl alkoxy" refers to d-Co-alkyl groups having an alkoxy substituent, including 2-ethoxyethyl and the like.
"Alkoxycarbonyl" refers to the group -C(O)OR where R includes "d-Ce-alkyl" or "aryl" or "heteroaryl" or "d-Ce-alkyl aryl" or "d-Ce-alkyl heteroaryl".
"Aminocarbonyl" refers to the group -C(O)NRR' where each R, R' includes independently hydrogen or d-Ce-alkyl or aryl or heteroaryl or "d-Co-alkyl aryl" or "d-Ce-alkyl heteroaryl".
"Acylamino" refers to the group -NR(CO)R' where each R, R' is independently hydrogen or "Ci-C6-alkyl" or "aryl" or "heteroaryl" or "Ci-C6-alkyl aryl" or "Ci-C6-alkyl heteroaryl".
"Halogen" refers to fluoro, chloro, bromo and iodo atoms.
"Sulfonyloxy" refers to a group -OSO2-R wherein R is selected from H, "d-Ce-alkyl", "d-Ce-alkyl" substituted with halogens, e.g., an -OSO2-CF3 group, "C2-C6-alkenyl", "C2- C6-alkynyl", "C3-C8-cycloalkyl", "heterocycloalkyl", "aryl", "heteroaryl", "d-Ce-alkyl aryl" or "Ct-Ce-alkyl heteroaryl", "C2-C6-alkenyl aryl", "C2-C6-alkenyl heteroaryl", "C2- C6-alkynyl aryl", "C2-C6-alkynylheteroaryl", "Ct-Ce-alkyl cycloalkyl", "d-Ce-alkyl heterocycloalkyl".
"Sulfonyl" refers to group "-SO2-R" wherein R is selected from H, "aryl", "heteroaryl", "d-Ce-alkyl", "d-Ce-alkyl" substituted with halogens, e.g., an -SO2-CF3 group, "C2-C6- alkenyl", "C2-C6-alkynyl", "C3-C8-cycloalkyl", "heterocycloalkyl", "aryl", "heteroaryl", "Ci-Ce-alkyl aryl" or "Ct-Ce-alkyl heteroaryl", "C2-C6-alkenyl aryl", "C2-C6-alkenyl heteroaryl", "C2-C6-alkynyl aryl", "C2-C6-alkynylheteroaryl", "d-Ce-alkyl cycloalkyl", "Ct-Ce-alkyl heterocycloalkyl".
"Sulfinyl" refers to a group "-S(O)-R" wherein R is selected from H, "d-Ce-alkyl", "C1- C6-alkyl" substituted with halogens, e.g., an -SO-CF3 group, "C2-C6-alkenyl", "C2-C6- alkynyl", "C3-C8-cycloalkyl", "heterocycloalkyl", "aryl", "heteroaryl", "d-Ce-alkyl aryl" or "Ci-C6-alkyl heteroaryl", "C2-C6-alkenyl aryl", "C2-C6-alkenyl heteroaryl", "C2-C6- alkynyl aryl", "C2-C6-alkynylheteroaryl", "d-Ce-alkyl cycloalkyl", "d-Ce-alkyl heterocycloalkyl".
"Sulfanyl" refers to groups -S-R where R includes H, "d-Ce-alkyl", "d-Ce-alkyl" optionally substituted with halogens., e.g a -S-CF3 group, "C2-C6-alkenyl", "C2-C6- alkynyl", "C3-C8-cycloalkyl", "heterocycloalkyl", "aryl", "heteroaryl", "d-Ce-alkyl aryl" or "d-Ce-alkyl heteroaryl", "C2-C6-alkenyl aryl", "C2-C6-alkenyl heteroaryl", "C2-C6- alkynyl aryl", "C2-C6-alkynylheteroaryl", "d-Ce-alkyl cycloalkyl", "d-Ce-alkyl heterocycloalkyl". Preferred sulfanyl groups include methylsulfanyl, ethylsulianyl, and the like.
"Sulfonylamino" refers to a group -NRSO2-R' where each R, R' includes independently hydrogen, "d-Ce-alkyl", "C2-C6-alkenyl", "C2-C6-alkynyl", "C3-C8-cycloalkyl", "heterocycloalkyl", "aryl", "heteroaryl", "d-Ce-alkyl aryl" or "d-Ce-alkyl heteroaryl", "C2-C6-alkenyl aryl", "C2-C6-alkenyl heteroaryl", "C2-C6-alkynyl aryl", "C2-C6- alkynylheteroaryl", "d-Ce-alkyl cycloalkyl", "d-Ce-alkyl heterocycloalkyl".
"Aminosulfonyl" refers to a group -SO2-NRR where each R, R' includes independently hydrogen, "d-Ce-alkyl", "C2-C6-alkenyl", "C2-C6-alkynyl", "C3-C8-cycloalkyl", "heterocycloalkyl", "aryl", "heteroaryl", "Ci-C6-alkyl aryl" or "Ci-C6-alkyl heteroaryl", "C2-C6-alkenyl aryl", "C2-C6-alkenyl heteroaryl", "C2-C6-alkynyl aryl", "C2-C6- alkynylheteroaryl", "d-Ce-alkyl cycloalkyl", "d-Ce-alkyl heterocycloalkyl". "Amino" refers to the group -NRR' where each R, R' is independently hydrogen, "C1-C6- alkyl", "C2-C6-alkenyl", "C2-C6-alkynyl", "C3-C8-cycloalkyl", "heterocycloalkyl", "aryl", "heteroaryl", "d-Ce-alkyl aryl" or "d-Ce-alkyl heteroaryl", "C2-C6-alkenyl aryl", "C2-C6- alkenyl heteroaryl", "C2-C6-alkynyl aryl", "C2-C6-alkynylheteroaryl", "d-Ce-alkyl cycloalkyl", "d-Co-alkyl heterocycloalkyl", and where R and R', together with the nitrogen atom to which they are attached, can optionally form a 3-8-membered heterocycloalkyl ring.
"Substituted or unsubstituted": Unless otherwise constrained by the definition of the individual substituent, the above set out groups, like "alkyl", "alkenyl", "alkynyl", "alkoxy", "aryl" and "heteroaryl" etc. groups can optionally be substituted with from 1 to 5 substituents selected from the group consisting of "d-Cό-alky?', "Ci-Cό-alkyl aryl", "C1- C6-alkyl heteroaryl", "C2-C6-alkenyl", "C2-C6-alkynyl", primary, secondary or tertiary amino groups or quaternary ammonium moieties, "acyl", "acyloxy", "acylamino", "aminocarbonyl", "alkoxycarbonyl", "aryl", "aryloxy", "heteroaryl", "heteroaryloxy", carboxyl, cyano, halogen, hydroxy, nitro, sulfanyl, sulphoxy, sulphonyl, sulfonamide, alkoxy, thioalkoxy, trihalomethyl and the like. Within the framework of this invention, said "substitution" is meant to also comprise situations where neighboring substituents undergo ring closure, in particular when vicinal functional substituents are involved, thus forming e.g. lactams, lactons, cyclic anhydrides, but also acetals, thioacetals, aminals formed by ring closure for instance in an effort to obtain a protective group.
"Pharmaceutically acceptable cationic salts or complexes" is intended to define such salts as the alkali metal salts, (e.g. sodium and potassium), alkaline earth metal salts (e.g. calcium or magnesium), aluminium salts, ammonium salts and salts with organic amines such as with methylamine, dimethylamine, trimethylamine, ethylamine, triethylamine, morpholine, N-Me-D-glucamine, N,N'-bis(phenylmethyl)-l,2-ethanediamine, ethanolamine, diethanolamine, ethylenediamine, N-methylmorpholine, piperidine, benzathine (N,N'-dibenzylethylenediamine), choline, ethylene-diamine, meglumine (N- methylglucamine), benethamine (N-benzylphenethylamine), diethylamine, piperazine, thromethamine (2-amino-2-hydroxymethyl-l,3-propanediol), procaine as well as amines of formula -NR5R', R" wherein R, R', R" is independently hydrogen, alkyl or benzyl. Especially preferred salts are sodium and potassium salts.
"Pharmaceutically acceptable salts or complexes" refers to salts or complexes of the below- identified compounds of Formula I that retain the desired biological activity. Examples of such salts include, but are not restricted to, acid addition salts formed with inorganic acids (e.g. hydrochloric acid, hydrobromic acid, suliuric acid, phosphoric acid, nitric acid, and the like), and salts formed with organic acids such as acetic acid, oxalic acid, tartaric acid, succinic acid, malic acid, fumaric acid, maleic acid, ascorbic acid, benzoic acid, tannic acid, pamoic acid, alginic acid, polyglutamic acid, naphthalene sulfonic acid, naphthalene disul- fonic acid, and poly-galacturonic acid. Said compounds can also be administered as pharmaceutically acceptable quaternary salts known by a person skilled in the art, which specifically include the quarternary ammonium salt of the Formula -NR,R',R" + Z", wherein R, R', R" is independently hydrogen, alkyl, or benzyl, and Z is a counterion, including chloride, bromide, iodide, -O-alkyl, toluenesulfonate, methylsulfonate, sulfonate, phosphate, or carboxylate (such as benzoate, succinate, acetate, glycolate, maleate, malate, fumarate, citrate, tartrate, ascorbate, cinnamoate, mandeloate, and diphenylacetate).
"Pharmaceutically active derivative" refers to any compound that, upon administration to the recipient, is capable of providing directly or indirectly, the activity disclosed herein.
The compounds of the present invention according to Formula I are useful in the treatment and/or prevention of diseases selected from allergic diseases such as allergic asthma, allergic rhinitis, allergic conjunctivitis, systemic anaphylaxis or hypersensitivity responses, and inflammatory dermatoses such as atopic dermatitis, eczema, allergic contact dermatitis, and urticaria, myositis, neurodegenerative disorders such as neuropatic pain, and other inflammatory diseases such as rheumatoid arthritis, multiple sclerosis, osteoarthritis, and inflammatory bowel disease (IBD).
Figure imgf000014_0001
In one embodiment the compounds according to Formula (I) are suitable as modulators, notably as antagonists, of CRTH2. Therefore, the compounds of the present invention are also particularly useful for the treatment and/or prevention of disorders, which are mediated by CRTH2 activity. Said treatment involves the modulation of CRTH2, notably an inhibition of CRTH2 or an antagonizing effect of CRTH2 in mammals, and in particular in humans. The modulators of CRTH2 are selected from the group consisting of an antagonist, an inverse agonist, a partial agonist and an agonist of CRTH2.
In another embodiment, the modulators of CRTH2 are antagonists of CRTH2.
In one embodiment, the modulators of CRTH2 are inverse agonists of CRTH2.
In another embodiment, the modulators of CRTH2 are partial agonists of CRTH2.
In another embodiment, the modulators of CRTH2 are agonists of CRTH2.
The compounds according to Formula (I) are suitable for use as a medicament.
Compounds of Formula (I) include also their geometrical isomers, their optically active forms as enantiomers, diastereomers, its racemate forms and tautomers, as well as pharmaceutically acceptable salts thereof, wherein:
A is either an amine selected from the group consisting of:
Figure imgf000015_0001
or an alkyl, acyl, amino carbonyl or ether selected from the group consisting of:
O O ?
B^(CH2)n—R3 B- — LR3 B— !I-N4VR3 β4kΛr R3
A5 A6 A7 A8
with each n being an integer independently selected irom 0, 1, 2, 3 or 4;
m is either 1 or 2;
wherein, R7 is selected from the group consisting of hydrogen, substituted or unsubstituted Ct-Cό-alkyl, substituted or unsubstituted C2-C6-alkenyl, substituted or unsubstituted C2-C6- alkynyl, substituted or unsubstituted aryl, substituted or unsubstituted heteroaryl, substituted or unsubstituted C3-C8-cycloalkyl, substituted or unsubstituted C3-C8- heterocycloalkyl, carboxyl, cyano, amino and hydroxyl.
R8 is selected from the group consisting of hydrogen, substituted or unsubstituted C1-C6- alkyl, substituted or unsubstituted aryl, and substituted or unsubstituted heteroaryl.
B is selected from the group consisting of a substituted or unsubstituted C2-C6-alkynyl, substituted or unsubstituted C3-C8-cycloalkyl, substituted or unsubstituted C3-C8- heterocycloalkyl, substituted or unsubstituted aryl, and substituted or unsubstituted monocyclic heteroaryl.
Examples of B include ethynyl, propynyl, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, cyclooctyl, pyrrolidinyl, pyrazolidinyl, piperidinyl, piperazinyl, pyridyl, imidazolidinyl, 1,2,4-oxadiazolidinyl, 1,2,5-oxadiazolidinyl, 1,3,4-oxadiazolidinyl, isoxazolidinyl, morpholinyl, phenyl, naphthyl, pyrrolyl, pyrimidyl, furyl, thienyl, imidazolyl, oxazolyl, isoxazolyl, thiazolyl, isothiazolyl, carbazolyl, 1,2,3-triazolyl, 1,2,4- triazolyl, 1,2,3-oxadiazolyl, 1,2,4-oxadiazolyl, 1,2,5-oxadiazolyl, 1,3,4-oxadiazolyl, tetrazolyl, 1,3,4-triazinyl, 1,2,3-triazinyl, oxolanyl, pyrolidinyl, pyrazolidinyl, piperidinyl, piperazinyl.
According to one embodiment, B is selected from the group of a substituted or unsubstituted aryl, a substituted or unsubstituted C3-C8-heterocycloalkyl and a substituted or unsubstituted alkynyl.
According to one embodiment, B is a substituted or unsubstituted aryl group (e.g. phenyl). According to another embodiment said phenyl group is mono-substituted in ortho, meta or para position.
In another embodiment, B is a C3-C8-heterocycloalkyl group (e.g. piperazinyl, furyl or thienyl).
According to another embodiment, B is an alkynyl group (e.g. ethynyl or propynyl).
R1 is either hydrogen or a substituted or unsubstituted d-Cό-alkyl. In a preferred embodiment R1 is hydrogen.
R2 is selected from the group consisting of substituted or unsubstituted Ct-Cό-alkyl, substituted or unsubstituted aryl, and substituted or unsubstituted heteroaryl, substituted or unsubstituted C3-C8-cycloalkyl and substituted or unsubstituted C3-C8-heterocycloalkyl.
Examples of R2 include methyl, ethyl, propyl, t-butyl, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, cyclooctyl, pyrolidinyl, pyrazolidinyl, piperidinyl, piperazinyl, pyridyl, imidazolidinyl, 1,2,4-oxadiazolidinyl, 1,2,5-oxadiazolidinyl, 1,3,4-oxadiazolidinyl, isoxazolidinyl or morpholinyl, phenyl, naphthyl, pyrrolyl, pyrimidyl, quinolizinyl, iuryl, thienyl, imidazolyl, oxazolyl, isoxazolyl, thiazolyl, isothiazolyl, carbazolyl, 1,2,3-triazolyl, 1,2,4-triazolyl, 1,2,3-oxadiazolyl, 1,2,4-oxadiazolyl, 1,2,5-oxadiazolyl, 1,3,4-oxadiazolyl, tetrazolyl, 1,3,4-triazinyl, 1,2,3-triazinyl, benzofuryl, isobenzofuryl, benzothienyl, benzotriazolyl, isobenzothienyl, indolyl, isoindolyl, 3H-indolyl, benzimidazolyl, benzothiazolyl, benzoxazolyl, oxolanyl, pyrolidinyl, pyrazolidinyl, piperidinyl, piperazinyl, pyridyl, imidazolidinyl, 1,2,4-oxadiazolidinyl, 1,2,5-oxadiazolidinyl, 1,3,4-oxadiazolidinyl, isoxazolidinyl, quinazolinyl, pthalazinyl, quinoxalinyl, cinnolinyl, napthyridinyl, quinolyl, isoquinolyl, tetrazolyl, 5,6,7,8-tetrahydroquinolyl, 5,6,7,8-tetrahydroisoquinolyl, purinyl, pteridinyl, xanthenyl or benzoquinolyl.
According to one embodiment, R2 is a substituted or unsubstituted aryl group (e.g. phenyl).
The substituents in a substituted R2 are selected from the group consisting of halogen, cyano, d-Cό-alkyl, d-Cό-alkoxy, thioalkoxy and thioalkyl.
In one embodiment R2 is optionally substituted with one or more substituents selected from the group consisting of halogen, cyano, d-Cό-alkyl, d-Cό-alkoxy, thioalkoxy and thioalkyl.
According to another embodiment, R2 is substituted in ortho, meta or para position. In one embodiment, R2 is chlorophenyl.
According to another embodiment, R2 is substituted or unsubstituted heteroaryl group (e.g. pyridinyl or thienyl).
According to another embodiment, R2 is a substituted or unsubstituted d-Cό-alkyl group (e.g. methyl).
R3 is selected from the group consisting of a substituted or unsubstituted d-Ce-alkyl, substituted or unsubstituted aryl, substituted or unsubstituted heteroaryl, substituted or unsubstituted C3-C8-cycloalkyl and substituted or unsubstituted C3-C8-heterocycloalkyl; wherein said substituted or unsubstituted aryl, heteroaryl, C3-C8-cycloalkyl or C3-C8- heterocycloalkyl may be fused to one or more substituted or unsubstituted aryl, heteroaryl, C3-C8-cycloalkyl or C3-C8-heterocycloalkyl group and may be substituted with one or more substituents selected of the group consisting of Ct-Cβ-alkyl, alkoxy, aryl, heteroaryl, carboxyl, cyano, halogen, hydroxy, amino, amino carbonyl, nitro, sulfoxy, sulfonyl, sulfonamide and trihalo-d-Ce-alkyl.
Examples of R3 include methyl, ethyl, propyl, butyl, t-butyl, phenyl, naphthyl, phenantrenyl, pyrrolyl, furyl, thienyl, imidazolyl, oxazolyl, isoxazolyl, thiazolyl, isothiazolyl, pyrazolyl, carbazolyl, 1,2,3-triazolyl, 1,2,4-triazolyl, 1,2,3-oxadiazolyl, benzo(2,l,3)oxadiazolyl, benzo(l,2,5)oxadiazolyl, benzo[l,3]dioxole, 1,2,4-oxadiazolyl, 1,2,5-oxadiazolyl, 1,3,4-oxadiazolyl, tetrazolyl, 1,3,4-triazinyl, 1,2,3-triazinyl, benzofuryl, [2,3-dihydro]benzofuryl, 3,4-dihydrolH-benzo[l ,4]diazepine-2,5-dione, isobenzofuryl, benzothienyl, benzotriazolyl, isobenzothienyl, indolyl, isoindolyl, 3H-indolyl, benzimidazolyl, benzothiazolyl, benzoxazolyl, pyridazinyl, pyrimidyl, quinolizinyl, quinazolinyl, pthalazinyl, quinoxalinyl, cinnolinyl, napthyridinyl, quinolyl, isoquinolyl, tetrazolyl, 5,6,7,8-tetrahydroquinolyl, 5,6,7 ,8-tetrahydroisoquinolyl, purinyl, pteridinyl, carbazolyl, xanthenyl, benzoquinolyl, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, cyclooctyl, oxolanyl, pyrrolidinyl, pyrazolidinyl, piperidinyl, piperazinyl, pyridyl, imidazolidinyl, 1,2,4-oxadiazolidinyl, 1,2,5-oxadiazolidinyl, 1,3,4-oxadiazolidinyl, isoxazolidinyl or morpholinyl.
According to one embodiment, R3 is a substituted or unsubstituted aryl group (e.g. phenyl or naphthyl). The substituents in a substituted R3 are selected from the group consisting of halogen, cyano, Ct-Cό-alkyl, Ct-Cό-alkoxy, heteroaryl, aryl, thioalkoxy and thioalkyl.
In one embodiment R3 is optionally substituted with one or more substituents selected from the group consisting of halogen, cyano, d-Co-alkyl, Ct-Cό-alkoxy, heteroaryl, aryl, thioalkoxy and thioalkyl. Examples for a substituted phenyl moiety are 4-trifluoromethoxyphenyl, 3-methoxyphenyl, 4-chlorophenyl, 3,5-dimethylphenyl, 2-benzamide or 2-benzoic acid.
In another embodiment, R3 is a substituted or unsubstituted heteroaryl group (e.g. pyridyl, quinolyl, benzimidazolyl, indolyl, pyridazinyl, pyrazinyl or 1,3,4-thiadiazolyl). An example for a substituted benzimidazole is 2-ethyl-2H-benzimidazolyl.
In another embodiment, R3 is an aryl group iused to a C3-C8-heterocycloalkyl group (e.g. 1 ,3-dihydrobenzimidazole-2-one, 3,4-dihydro lH-benzo[ 1 ,4]diazepine-2,5-dione).
In another embodiment, R3 is a substituted or unsubstituted C3-C8-heterocyclalkyl group fused to a substituted or unsubstituted aryl group (e.g. 1,2,3,4-tetrahydrochinoline, 1,2,3,4- tetrahydrochinoxaline, 2,3-dehydrobenzol,4-oxazine, 2,3-dehydro-indole or dihydrobenzo- pyrrolodiazepine).
In another embodiment, R3 is a substituted or unsubstituted C3-C8-heterocyclalkyl group fused to a substituted or unsubstituted aryl group and to a substituted or unsubstituted heteroaryl group (e.g.dihydrobenzopyrrolodiazepine).
In another embodiment, R3 is a substituted or unsubstituted alkyl group (e.g. isopropyl).
According to another embodiment, the substituents at R2 or R3 are selected from the group consisting of Ct-Cβ-alkyl, alkoxy, cyano, amino and halogen (e.g. methyl, ethyl, butyl, tert.- butyl, methoxy, ethoxy, tert.-butoxy, phenoxy, chloro, fluoro); wherein alkyl, alkoxy or aryloxy are optionally substituted with halogen (e.g. trifluoromethyl, trifluoromethoxy);
as well as isomers and mixtures of these for use as a medicament.
Another specific sub-group of formula (I) are compounds having formula (T), whereby A, B, R2 and R3 are defined as above and each R1 can be independently hydrogen or substituted or unsubstituted Ci-Cβ-alkyl. In a preferred embodiment, R1 is hydrogen.
Figure imgf000020_0001
A specific sub-group of formulae (I ) and (F) are compounds having the formulae (Ia-Id), whereby A, R2 and R3 are defined as above and Z is O or S.
Figure imgf000020_0002
(Ia) (Ib)
Figure imgf000020_0003
(Ic) (Id)
Preferred pharmaceutically acceptable salts of compounds of Formula I, and compounds of sub-groups of Formulae (Ia) - (Id) containing a basic residue such as, for example, a primary, secondary, or tertiary amine or a pyridyl moiety, are acid addition salts formed with pharmaceutically acceptable acids like hydrochloride, hydrobromide, sulfate or bisulfate, phosphate or hydrogen phosphate, acetate, benzoate, succinate, iumarate, maleate, lactate, citrate, tartrate, gluconate, methane-sulfonate, benzenesulfonate, aadpara- toluenesulfonate salts.
Compounds of the present invention that are particularly suitable for use as a medicament, include in particular those of the group consisting of:
Figure imgf000021_0001
Figure imgf000022_0001
Figure imgf000023_0001
Figure imgf000024_0001
Figure imgf000025_0001
In a second aspect, the invention provides a pharmaceutical composition comprising a 2,3 substituted pyrazine sulfonamide according to Formula (I), together with a pharmaceutically acceptable excipient or carrier. In a third aspect, the invention provides the use of a 2,3 substituted pyrazine sulfonamide according to formulae (I) for the preparation of a medicament for the treatment and/or prevention of a disease selected from allergic diseases such as allergic asthma, allergic rhinitis, allergic conjunctivitis, systemic anaphylaxis or hypersensitivity responses, and inflammatory dermatoses such as atopic dermatitis, eczema, allergic contact dermatitis, and urticaria, myositis and other diseases with an inflammatory component such as rheumatoid arthritis, osteoarthritis, and inflammatory bowel disease (IBD) and other diseases and disorders associated with CTRH2 activity.
In a forth aspect, the invention provides a method for treating and/or preventing a patient suffering from a disease selected from allergic diseases such as allergic asthma, allergic rhinitis, allergic conjunctivitis, systemic anaphylaxis or hypersensitivity responses, and inflammatory dermatoses such as atopic dermatitis, eczema, allergic contact dermatitis, and urticaria, myositis, neurodegenerative disorders such as neuropatic pain, and other inflammatory diseases such as rheumatoid arthritis, multiple sclerosis, osteoarthritis, and inflammatory bowel disease (IBD) and other diseases and disorders associated with
CTRH2 activity, by administering a 2,3 substituted pyrazine sulfonamide according to
Formula (I).
The term "preventing", as used herein, should be understood as partially or totally preventing, inhibiting, alleviating, or reversing one or more symptoms or cause(s) of allergic disease or inflammatory dermatitis.
In a fifth aspect, the invention provides the use of a 2,3 substituted pyrazine sulfonamide of Formula (I) for the preparation of a pharmaceutical composition useiul for a variety of therapies, including preventing and/or treating a disease selected from allergic diseases such as allergic asthma, allergic rhinitis, allergic conjunctivitis, systemic anaphylaxis or hypersensitivity responses, and inflammatory dermatoses such as atopic dermatitis, eczema, allergic contact dermatitis, and urticaria, myositis, neurodegenerative disorders such as neuropatic pain, and other inflammatory diseases such as rheumatoid arthritis, multiple sclerosis, osteoarthritis, and inflammatory bowel disease (IBD) and other diseases and disorders associated with CTRH2 activity.
The invention provides further the use of a 2,3 substituted pyrazine sulfonamide of Formula
(I) for preventing and/or treating a disease selected from allergic diseases such as allergic asthma, allergic rhinitis, allergic conjunctivitis, systemic anaphylaxis or hypersensitivity responses, and inflammatory dermatoses such as atopic dermatitis, eczema, allergic contact dermatitis, and urticaria, myositis, neurodegenerative disorders such as neuropatic pain, and other inflammatory diseases such as rheumatoid arthritis, multiple sclerosis, osteoarthritis, and inflammatory bowel disease (IBD) and other diseases and disorders associated with CTRH2 activity.
The compounds of the invention, together with a conventionally employed adjuvant, carrier, diluent or excipient may be placed into the form of pharmaceutical compositions and unit dosages thereof, and in such form may be employed as solids, such as tablets or filled capsules, or liquids such as solutions, suspensions, emulsions, elixirs, or capsules filled with the same, all for oral use, or in the form of sterile injectable solutions for parenteral (including subcutaneous use). Such pharmaceutical compositions and unit dosage forms thereof may comprise ingredients in conventional proportions, with or without additional active compounds or principles, and such unit dosage forms may contain any suitable effective amount of the active ingredient commensurate with the intended daily dosage range to be employed.
The compounds according to Formula (I) of the present invention are typically administered in form of a pharmaceutical composition. Such compositions can be prepared in a manner well known in the pharmaceutical art and comprise at least one active compound. Generally, the compounds of this invention are administered in a pharmaceutically effective amount. The amount of the compound actually administered will typically be determined by a physician, in the light of the relevant circumstances, including the condition to be treated, the chosen route of administration, the actual compound administered, the age, weight, and response of the individual patient, the severity of the patient's symptoms, and the like.
The pharmaceutical compositions of these inventions can be administered by a variety of routes including oral, rectal, transdermal, subcutaneous, intravenous, intramuscular, and intranasal. The compositions for oral administration can take the form of bulk liquid solutions or suspensions, or bulk powders. More commonly, however, the compositions are presented in unit dosage forms to facilitate accurate dosing. The term "unit dosage forms" refers to physically discrete units suitable as unitary dosages for human subjects and other mammals, each unit containing a predetermined quantity of active material calculated to produce the desired therapeutic effect, in association with a suitable pharmaceutical excipient. Typical unit dosage forms include prefilled, premeasured ampoules or syringes of the liquid compositions or pills, tablets, capsules or the like in the case of solid compositions. In such compositions, the substituted methylene amide derivative according to the invention is usually a minor component (from about 0.1 to about 50% by weight or preferably from about 1 to about 40% by weight) with the remainder being various vehicles or carriers and processing aids helpful for forming the desired dosing form.
Liquid forms suitable for oral administration may include a suitable aqueous or nonaqueous vehicle with buffers, suspending and dispensing agents, colorants, flavors and the like. Solid forms may include, for example, any of the following ingredients, or compounds of a similar nature: a binder such as microcrystalline cellulose, gum tragacanth or gelatine; an excipient such as starch or lactose, a disintegrating agent such as alginic acid, Primogel, or corn starch; a lubricant such as magnesium stearate; a glidant such as colloidal silicon dioxide; a sweetening agent such as sucrose or saccharin; or a flavoring agent such as pepper-mint, methyl salicylate, or orange flavoring.
Injectable compositions are typically based upon injectable sterile saline or phosphate buffered saline or other injectable carriers known in the art. As above mentioned, substituted methylene amide derivatives of Formula (I) in such compositions is typically a minor component, frequently ranging between 0.05 to 10% by weight with the remainder being the injectable carrier and the like.
The above-described components for orally administered or injectable compositions are merely representative. Further materials as well as processing techniques and the like are set out in Part 5 of Remington 's Pharmaceutical Sciences, 20th Edition, 2000, Marck Publishing Company, Easton, Pennsylvania, which is incorporated herein be reference.
The compounds of this invention can also be administered in sustained release forms or from sustained release drug delivery systems. A description of representative sustained release materials can also be found in the incorporated materials in Remington's Pharmaceutical Sciences .
In a sixth aspect, the invention provides novel 2,3 -substituted pyrazine sulfonamides of Formulae (Ia) - (Id) wherein A, R2, and R3 are defined as described above. Novel compounds of Formulae (Ia) - (Id) are in particular those of the group consisting of:
N- {3-[4-(lH-indol-l -ylmethyl)phenyl]pyrazin-2-yl} -2- (trifluoromethyl)benzenesulfonamide,
2-chloiO-N-{3-[4-({methyl[4-(trifluoromethoxy)phenyl]amino}-methyl)phenyl]pyrazin-2- yl}benzenesulfonamide,
N-(3-{4-[(2-ethyl-lH-benzimidazol-l-yl)methyl]phenyl}pyrazin-2-yl)-2- (trifluoromethyl)benzenesulfonamide,
2-chloro-N-[3-(4-{[methyl(phenyl)amino]methyl}phenyl)pyrazin-2- yljbenzenesulfonamide,
2-chloro-N-(3-{4-[(2-naphthyloxy)methyl]phenyl}pyrazin-2-yl)-benzenesulfonamide,
2-chloro-N-{3-[4-(lH-indol-l-ylmethyl)phenyl]pyrazin-2-yl}-+benzenesulfonamide, 2-chloiO-N-(3-{4-[(5,6,7,8-tetrahydronaphthalen-2-yloxy)methyl]-phenyl}pyrazin-2- yl)benzenesulfonamide,
2-chloiO-N-(3-{4-[(2-ethyl-lH-benzimidazol-l-yl)methyl]phenyl}pyrazin-2- yl)benzenesulfonamide,
N-(3-{4-[(l,3-benzodioxol-5-ylamino)methyl]phenyl}pyrazin-2-yl)-2- (trifluoromethyl)benzenesulfonamide,
N-[3-(4-{[(3-methoxybenzyl)oxy]methyl}phenyl)pyrazin-2-yl]-2- (trifluoromethyl)benzenesulfonamide,
3-chloiO-N-{3-[4-({methyl[4-(trifluoromethoxy)phenyl]amino}-methyl)phenyl]pyrazin-2- yl}benzenesulfonamide,
N-[3-(4-{[(4-chlorophenyl)(methyl)amino]methyl}phenyl)pyrazin-2-yl]-thiophene-2- sulfonamide,
4-phenoxy-N-{3-[4-(quinolin-2-ylmethyl)piperazin-l-yl]pyrazin-2-yl}- benzenesulfonamide,
4-metnyl-N-{3-[4-({methyl[4-(trifluoromethoxy)phenyl]amino}-methyl)phenyl]pyrazin-2- yl}benzenesulfonamide,
4-chloiO-N-[3-(4-{[methyl(phenyl)amino]methyl}phenyl)pyrazin-2-yl]- benzenesulfonamide,
4-cyano-N-{3-[4-({methyl[4-(trifluoromethoxy)phenyl]-amino}-methyl)phenyl]pyrazin-2- yl}benzenesulfonamide,
N-[3-(4-{[(4-Fluoro-phenyl)-methyl-amino]-methyl}-phenyl)-pyrazin-2-yl]-2- trifluoromethyl-benzenesulfonamide, N-(3-{4-[(Methyl-phenyl-amino)-methyl]-phenyl}-pyrazin-2-yl)-2-trifluoiOmethyl- benzenesulfonamide,
N-[3-(4-{[(4-Cyano-phenyl)-methyl-amino]-methyl}-phenyl)-pyrazin-2-yl]-2- trifluoromethyl-benzenesulfonamide,
N- {3-[4-(4-Fluoro-phenoxymethyl)-phenyl]-pyrazin-2-yl} -2-trifluoromethyl- benzenesulfonamide,
N-(3-{4-[(Ethyl-phenyl-amino)-methyl]-phenyl}-pyrazin-2-yl)-2-trifluoromethyl- benzenesulfonamide,
N- {3-[4-(2,3-Dihydro-benzo[ 1 ,4]oxazin-4-ylmethyl)-phenyl]-pyrazin-2-yl} -2- trifluoromethyl-benzenesulfonamide,
N-[3-(4-{[(3-Fluoro-phenyl)-methyl-amino]-methyl}-phenyl)-pyrazin-2-yl]-2- trifluoromethyl-benzenesulfonamide,
N-{3-[4-(6-CUoro-pyridin-3-yloxymethyl)-phenyl]-pyrazin-2-yl}-2-trifluoiOmethyl- benzenesulfonamide,
N- {3-[4-(2-Pyridin-2-yl-indol-l -ylmethyl)-phenyl]-pyrazin-2-yl} -2-trifluoromethyl- benzenesulfonamide,
N- {3-[4-(5-Fluoro-indol-l -ylmethyl)-phenyl]-pyrazin-2-yl} -2-trifluoromethyl- benzenesulfonamide,
N-[3-(4-Phenoxymethyl-phenyl)-pyrazin-2-yl]-2-trifluoromethyl-benzenesulfonamide,
N-[3-(4-{[(4-Chloro-phenyl)-methyl-amino]-methyl}-phenyl)-pyrazin-2-yl]-2- trifluoromethyl-benzenesulfonamide, 2-Chloro-N-[3-(4-{[(4-cyano-phenyl)-methyl-amino]-methyl}-phenyl)-pyrazin-2-yl]- benzenesulfonamide,
N-[3-(4-{[(3,4-Dichloro-phenyl)-methyl-amino]-methyl}-phenyl)-pyrazin-2-yl]-2- trifluoromethyl-benzenesulfonamide,
N- {3-[4-(4-Cyano-phenoxymethyl)-phenyl]-pyrazin-2-yl} -2-trifluoromethyl- benzenesulfonamide,
N- {3-[4-(6-Fluoro-indol-l -ylmethyl)-phenyl]-pyrazin-2-yl} -2-trifluoromethyl- benzenesulfonamide,
2-Chloro-N-{3-[4-(5-methoxy-2-methyl-indol-l-ylmethyl)-phenyl]-pyrazin-2-yl}- benzenesulfonamide,
N-{3-[4-(4-Methoxy-phenoxymethyl)-phenyl]-pyrazin-2-yl}-2-trifluoiOmethyl- benzenesulfonamide,
N-(3-{4-[(Benzyl-pyridin-2-yl-amino)-methyl]-phenyl}-pyrazin-2-yl)-2-chloiO- benzenesulfonamide,
N- {3-[4-(2,3-Dihydro-indol-l -ylmethyl)-phenyl]-pyrazin-2-yl} -2-trifluoromethyl- benzenesulfonamide,
N-[3-(4-{[(2,4-Dichloro-phenyl)-methyl-amino]-methyl}-phenyl)-pyrazin-2-yl]-2- trifluoromethyl-benzenesulfonamide,
N-{3-[4-(3-Chloro-phenoxymethyl)-phenyl]-pyrazin-2-yl}-2-trifluoromethyl- benzenesulfonamide,
2-Chloro-N-[3-(4-{[(2,4-difluoro-phenyl)-methyl-amino]-methyl}-phenyl)-pyrazin-2-yl]- benzenesulfonamide, N- {3-[4-(2-Methyl-indol-l -ylmethyl)-phenyl]-pyrazin-2-yl} -2-trifluoromethyl- benzenesulfonamide,
2-Chloro-N-{3-[4-(5-fluoro-indol-l-ylmethyl)-phenyl]-pyrazin-2-yl}-benzenesulfonamide,
2-Chloro-N-[3-(4-{[(2-fluoro-phenyl)-methyl-amino]-methyl}-phenyl)-pyrazin-2-yl]- benzenesulfonamide,
2-Chloro-N-{3-[4-(2-methyl-indol-l-ylmethyl)-phenyl]-pyrazin-2-yl}-benzenesulfonamide,
N-(3-{4-[(Benzyl-pyridin-2-yl-amino)-methyl]-phenyl}-pyrazin-2-yl)-2-trifluoiOmethyl- benzenesulfonamide,
2-Chloro-N-(3-{4-[(ethyl-pyridin-2-yl-amino)-methyl]-phenyl}-pyrazin-2-yl)- benzenesulfonamide, and
N- {3-[4-(5-Chloro-2-methyl-indol-l -ylmethyl)-phenyl]-pyrazin-2-yl} -2-trifluoromethyl- benzenesulfonamide.
In a seventh aspect, the invention provides a method of synthesis of a compound according to formula (Ia)-(Id).
The 2,3 substituted sulfonamides exemplified in this invention may be prepared from readily available starting materials using the following general methods and procedures. It will be appreciated that where typical or preferred experimental conditions (i.e. reaction temperatures, time, moles of reagents, solvents etc.) are given, other experimental conditions can also be used unless otherwise stated. Optimum reaction conditions may vary with the particular reactants or solvents used, but such conditions can be determined by the person skilled in the art, using routine optimisation procedures.
A general description of methods for preparing compounds of Formula (I) is given in WO 04/058265 (PCT/GBOS/OOSόόδ). The general synthetic approach for obtaining compounds of Formulae (Ia)-(Id) is depicted in Scheme 1. Therein, 2,3-substituted pyrazine sulfonamide derivatives according to the general formula I, may be prepared in 4 to 5 chemical steps, from commercially available 2,3-dichloropyrazine. Synthetic protocols are outlined in Schemes 1 to 10.
Scheme 1
A = CH2, C(O)
NH2
R-S O CI\ ,N z = 0, S L = Cl, Br, coupling agent
Cl N O X = H, Me, Et, tBu
A if * ^1 ■ HN A N s
R5
Cr N Alkylation R-S O R3 = R-N or R6-0H
O or as described
Il III here above
Figure imgf000034_0001
X Xl Id In a more specific method, the sulfonamide derivatives XXI, wherein R2 is defined as above is reacted with the 2,3-dichloropyrazine II to give the corresponding 3- chloropyrazine sulfonamide compounds III. Several reaction conditions may be utilized for performing this first reaction step, e.g. by the use of sulfonamide derivative XXI in presence of a base such as cesium carbonate, potassium carbonate or the like. This reaction may be performed in solvents like NMP, DMF or DMA at various temperature depending on the intrinsic reactivity of compounds XXI and II, by traditional thermic or microwawe method, using standard conditions well known to the person skilled in the art or shown in Scheme 2, below:
Scheme 2
Figure imgf000035_0001
Il XXI Ml
The sulfonamide derivatives XXI are obtained from commercial sources or can be prepared by treatment of the corresponding sulfonyl chlorides XX, using standard conditions well known to the person skilled in the art, with a solution of 2M ammonia in EtOH or dioxane at room temperature for lhour or using can be performed at various temperature depending on the intrinsic reactivity of compounds XXI, by traditional thermal method or using microwave technology, using standard conditions well known to the person skilled in the art or shown in the Scheme 3, below.
Scheme 3 Cl NH,
2 ' EtOH 2 '
R-S=O NH, R-S=O
XX XXI
The 2,3-substituted pyrazine sulfonamide derivatives according to the general formula Ia, may be obtained in 3 subsequent steps depending the availability of starting materials and building blocks. A synthetic route is shown in Scheme 4. In a first step, the 2,3-substituted pyrazine sulfonamide derivatives IVa are isolated after condensation of the 3- chloropyrazine sulfonamide compounds III with the boronic acids XXII. This reaction may be performed in presence of appropriated palladium catalysts such as palladium diacetate and in solvents like Dioxane, methanol or solution containing both solvents in various ratios. This reaction can be performed at various temperatures depending on the intrinsic reactivity of compounds III, by traditional thermal method or using microwave technology, using standard conditions well known to the person skilled in the art.
In a subsequent step, the 2,3-substituted pyrazine sulfonamide derivatives Va, whereby the substituent R2 is as above defined, are isolated after chlorination of intermediate compounds IVa in presence of thionyl chloride. This reaction is usually performed at room temperature in solvents like dichloromethane, dichloroethane or DMF, using standard conditions well known to the person skilled in the art.
In a following step, as shown in Scheme 4, the 2,3-substituted pyrazine sulfonamide derivatives Va, may be treated with various nucleophiles, e.g. an amine XXIV or alcohol XXV, wherein R4, R5, R6 are independently selected from the group of hydrogen, alkyl, aryl, heteroaryl, cycloalkyl, heterocycloalkyl or fused ring systems of the mentioned to give the expected 2,3-substituted pyrazine sulfonamide derivative Ia. The nucleophilic displacement of the chlorine atom of the benzylic moiety by the amine XXIV or the alcohol XXV, is accomplished by treatment with an appropriated based such as sodium hydride or potassium tert-butoxide in anhydrous conditions, in presence or absence of e.g. sodium iodine or tetrabutylammonium iodine as catalyst in solvents such as DMF, THF or similar solvents. This reaction can be performed at various temperatures depending on the intrinsic reactivity of compounds Va, XXIV and XXV, by traditional thermal method or using microwave technology, using standard conditions well known to the person skilled in the art.
Scheme 4
Figure imgf000037_0001
The 2,3 -substituted pyrazine sulfonamide derivatives according to the general formula Ia, may also be obtained in 3 subsequent steps depending the availability of starting materials and building blocks. Another synthetic route is shown in Scheme 5. In a first step, the 2,3- substituted pyrazine sulfonamide derivatives FVb are isolated after condensation of the 3- chloropyrazine sulfonamide compounds III with the boronic acids XXIII. This reaction may be performed in presence of appropriate palladium catalysts such as palladium diacetate and in solvents like Dioxane, methanol or a solution containing both solvents in various ratios. This reaction can be performed at various temperatures depending on the intrinsic reactivity of compounds III, by traditional thermal method or using microwave technology, using standard conditions well known to the person skilled in the art.
In a subsequent step, the 2,3 -substituted pyrazine sulfonamide derivatives Vb, whereby the substituent R2 is as above defined, are isolated either after chlorination of intermediate compounds FVb in presence of oxalyl chloride or after treatment of compounds IVb with an appropriate coupling reagent such as DCC, HATU or Mukayama reagent in presence of a base like DIPEA or triethylamine. These reactions are usually performed at room temperature in solvents like dichloromethane, dichloroethane or DMF, using standard conditions well known to the person skilled in the art.
In a final step, as shown in Scheme 5, the 2,3 -substituted pyrazine sulfonamide derivative Vb, may be treated with various nucleophiles, e.g. an amine XXIV, to give the expected 2,3 -substituted pyrazine sulfonamide derivative Ia. The formation of the amide bond is accomplished by treatment with an appropriate base such as DIPEA or triethylamine, in solvents such as DMF, THF or similar solvents. This reaction can be performed at various temperatures depending on the intrinsic reactivity of compounds Vb and XXIV, by traditional thermal method or using microwave technology, using standard conditions well known to the person skilled in the art.
Scheme 5
Figure imgf000039_0001
A = C(O) L = Cl, interemdiafc i coupling agent
L
R4 N H O XXIV
R4 N
HN N HN N R3 = R2 S=O DMF or DCM, r.t. R2 S=O
O O
Vb Ia
The 2,3 -substituted pyrazine sulfonamide derivatives according to the general formula Ib, may be obtained in 3 subsequent steps depending the availability of starting materials and building blocks. A synthetic route is shown in Scheme 6. In a first step, the 2,3 -substituted pyrazine sulfonamide derivatives Via are isolated after condensation of the 3- chloropyrazine sulfonamide compounds III with the boronic acids XXVI. This reaction may be performed in presence of appropriate palladium catalysts such as palladium diacetate and in solvents like Dioxane, methanol or a solution containing both solvents in various ratios. This reaction can be performed at various temperatures depending on the intrinsic reactivity of compounds III, by traditional thermal method or using microwave technology, using standard conditions well known to the person skilled in the art.
In a subsequent step, the 2,3-substituted pyrazine sulfonamide derivatives Vila, whereby the substituent R2 is as above defined, are isolated after chlorination of intermediate compounds Via in presence of thionyl chloride. This reaction is usually performed at room temperature in solvents like dichloromethane, dichloroethane or DMF, using standard conditions well known to the person skilled in the art.
In a following step, as shown in Scheme 6, the 2,3 -substituted pyrazine sulfonamide derivatives Vila, may treated with various nucleophiles, e.g. an amine XXIV or alcohol XXV, to give the expected 2,3-substituted pyrazine sulfonamide derivative Ib. The nucleophilic displacement of the chlorine atom of the benzylic moiety by the amine XXIV or the alcohol XXV, is accomplished by treatment with an appropriate base such as sodium hydride or potassium tert-butoxide under anhydrous conditions, in presence or absence of e.g. sodium iodine or tetrabutylammonium iodine as catalyst in solvents such as DMF, THF or similar solvents. This reaction can be performed at various temperatures depending on the intrinsic reactivity of compounds Vila, XXIV and XXV, by traditional thermal method or using microwave technology, using standard conditions well known to the person skilled in the art.
Scheme 6
Figure imgf000040_0001
III XXVI Via Vila
Figure imgf000040_0002
The 2,3 -substituted pyrazine sulfonamide derivatives according to the general formula Ib, may also be obtained in 3 subsequent steps depending the availability of starting materials and building blocks. Another synthetic route is shown in Scheme 7. In a first step, the 2,3- substituted pyrazine sulfonamide derivatives VIb are isolated after condensation of the 3- chloropyrazine sulfonamide compounds III with the boronic acids XXVII. This reaction may be performed in presence of appropriate palladium catalysts such as palladium diacetate and in solvents like Dioxane, methanol or a solution containing both solvents in various ratios. This reaction can be performed at various temperatures depending on the intrinsic reactivity of compounds III, by traditional thermal method or using microwave technology, using standard conditions well known to the person skilled in the art.
In a subsequent step, the 2,3 -substituted pyrazine sulfonamide derivatives VIIb, whereby the substituent R2 is as above defined, are isolated either after chlorination of intermediate compounds VIb in presence of oxalyl chloride or after treatment of compounds VIb with an appropriate coupling reagent such as DCC, HATU or Mukayama reagent in presence of a base like DIPEA or triethylamine. These reactions are usually performed at room temperature in solvents like dichloromethane, dichloroethane or DMF, using standard conditions well known to the person skilled in the art.
In a final step, as shown in Scheme 7, the 2,3-substituted pyrazine sulfonamide derivatives VIIb, may be treated with various nucleophiles, e.g. an amine XXIV, to give the expected 2,3-substituted pyrazine sulfonamide derivatives Ib. The formation of the amide bond is accomplished by treatment with an appropriate base such as DIPEA or triethylamine, in solvents such as DMF, THF or similar solvents. This reaction can be performed at various temperatures depending on the intrinsic reactivity of compounds VIIb and XXIV, by traditional thermal method or using microwave technology, using standard conditions well known to the person skilled in the art. Scheme 7
Figure imgf000042_0001
coupling agent
=
Figure imgf000042_0003
Figure imgf000042_0002
VIIb Ib
The 2,3 -substituted pyrazine sulfonamide derivatives according to the general formula Ic, may be obtained in 3 subsequent steps depending the availability of starting materials and building blocks. A synthetic route is shown in Scheme 8. In a first step, the 2,3 -substituted pyrazine sulfonamide derivatives Villa are isolated after condensation of the 3- chloropyrazine sulfonamide compounds III with the acetylene XXVIII. This reaction may be performed in the presence of appropriate palladium catalysts such as palladium triphenyl phosphine tetrakis or Pd(Ph3)2Cl2 in presence of cupper iodine and potassium acetate, in solvents like Dioxane, DMF or a solution containing both solvents in various ratios. This reaction can be performed at various temperatures depending on the intrinsic reactivity of compounds III, by traditional thermal method or using microwave technology, using standard conditions well known to the person skilled in the art.
In a subsequent step, the 2,3 -substituted pyrazine sulfonamide derivatives IXa, whereby the substituent R2 is as above defined, are isolated after chlorination of intermediate compounds Villa in presence of thionyl chloride. This reaction is usually performed at room temperature in solvents like dichloromethane, dichloroethane or DMF, using standard conditions well known to the person skilled in the art
In a following step, as shown in Scheme 8, the 2,3 -substituted pyrazine sulfonamide derivatives DCa, may be treated with various nucleophiles, e.g. an amine XXIV or alcohol XXV, to give the expected 2,3 -substituted pyrazine sulfonamide derivatives Ic. The nucleophilic displacement of the chlorine atom of the benzylic moiety by the amine XXIV or the alcohol XXV, is accomplished by treatment with an appropriate base such as sodium hydride or potassium tert-butoxide under anhydrous conditions, in presence or absence of e.g. sodium iodine or tetrabutylammonium iodine as catalyst in solvents such as DMF, THF or similar solvents. This reaction can be performed at various temperatures depending on the intrinsic reactivity of compounds IXa, XXIV and XXV, by traditional thermal method or using microwave technology, using standard conditions well known to the person skilled in the art.
Scheme 8
Figure imgf000043_0001
The 2,3 -substituted pyrazine sulfonamide derivatives according to the general formula Ic, may also be obtained in 3 subsequent steps depending the availability of starting materials and building blocks. Another synthetic route is shown in Scheme 9. In a first step, the 2,3- substituted pyrazine sulfonamide derivatives VIIIb are isolated after condensation of the 3- chloropyrazine sulfonamide compounds III with the acetylene XXIX. This reaction may be performed in the presence of appropriate palladium catalysts such as palladium triphenyl phosphine tetrakis or Pd(Ph3)2Cl2 in presence of cupper iodine and potassium acetate, in solvents like Dioxane, DMF or a solution containing both solvents in various ratios. This reaction can be performed at various temperatures depending on the intrinsic reactivity of compounds III, by traditional thermal method or using microwave technology, using standard conditions well known to the person skilled in the art.
In a subsequent step, the 2,3 -substituted pyrazine sulfonamide derivatives IXb, whereby the substituent R2 is as above defined, are isolated either after chlorination of intermediate compounds VIIIb in the presence of oxalyl chloride or after treatment of compounds VIIIb with an appropriate coupling reagent such as DCC, HATU or Mukayama reagent in presence of a base like DIPEA or triethylamine. These reactions are usually performed at room temperature in solvent like dichloromethane, dichloroethane or DMF, using standard conditions well known to the person skilled in the art
In a final step, as shown in Scheme 9, the 2,3-substituted pyrazine sulfonamide derivatives IXb, may be treated with various nucleophiles, e.g. an amine XXIV, to give the expected
2,3-substituted pyrazine sulfonamide derivative Ic. The formation of the amide bond is accomplished by treatment with an appropriate base such as DIPEA or triethylamine, in solvents such as DMF, THF or similar solvents. This reaction can be performed at various temperatures depending on the intrinsic reactivity of compounds IXb and XXIV, by traditional thermal method or using microwave technology, using standard conditions well known to the person skilled in the art. Scheme 9
Figure imgf000045_0001
VIIIb IXb
Figure imgf000045_0002
IXb Ic
The 2,3 -substituted pyrazine sulfonamide derivatives according to the general formula Id, may be obtained in 3 subsequent steps depending the availability of starting materials and building blocks. A synthetic route is shown in Scheme 10. In a first step, the 2,3 -substituted pyrazine sulfonamide derivatives X are isolated after condensation of the 3-chloropyrazine sulfonamide compounds III with the piperazine-1-carboxylic acid tert-butyl ester XXX.
This reaction may be performed in presence of an appropriate base such as DIPEA or triethylamine, in solvents like NMP, DMF or a solution containing both solvents in various ratios. This reaction can be performed at various temperatures depending on the intrinsic reactivity of compounds III, by traditional thermal method or using microwave technology, using standard conditions well known to the person skilled in the art.
In a subsequent step, the 2,3 -substituted pyrazine sulfonamide derivatives XI, whereby the substituent R2 is deprotected under acidic conditions using either TFA or HCl solution at different concentrations. This reaction is usually performed at room temperature in solvents like dichloromethane, dichloroethane or DMF, using standard conditions well known to the person skilled in the art. In a following step, as shown in Scheme 10, the 2,3-substituted pyrazine sulfonamide derivatives X, may be treated either with various electrophiles, e.g. an alkyl halide XXXIa in the presence of an appropriate base such as Cs2CO3, DIPEA or triethylamine, or also with an acyl chloride or a carboxylic acid XXXIb initially preactivated by treatment with an appropriate coupling reagent such as DCC, Mukayama reagent, PyBrop, in order to give the expected 2,3-substituted pyrazine sulfonamide derivative Id. The nucleophilic displacement of the halide atom or the formation of the amide bond respectively, with the alkyl halide XXXIa or acyl chloride or carboxylic acid XXXIb can be performed at various temperatures depending on the intrinsic reactivity of compounds XI, XXXIa or XXXIb, by traditional thermal method or using microwave technology, using standard conditions well known to the person skilled in the art.
Scheme 10
Figure imgf000046_0001
Figure imgf000046_0002
Xl DIPEA, THF
Id The following abbreviations refer respectively to the definitions below:
min (minute), hr (hour), g (gram), MHz (Megahertz), ml (milliliter), mmol (millimole), mM (millimolar), RT (room temperature), ATP (Adenoside Triphosphate), BSA (Bovine Serum Albumin), DCM (dichloromethane), DCC (dicyclohexylcarbodiimide), DIPEA (di- isopropyl ethylamine), DMSO (Dimethyl Sulfoxide), Mukayama reagent (l-methyl-2- chloropyridinium iodide), DMF (Dimethylformamide), CsCO3 (Cesium carbonate), cHex (Cyclohexanes), Et3N (Triethylamine), EtOAc (Ethyl acetate), EtOH (Ethanol), K2CO3 (potassium carbonate), NaI (Sodium Iodine), NaH (Sodium hydride), NaHCO3 (Sodium bicarbonate), NH4Cl (Ammonium chloride), TEA (Triethyl amine), TFA (Trifluoroacetic acid), THF (Tetrahydroiuran), Pd(PPh3)4 (Palladium triphenylphosphine tetrakis), CuI (Copper iodide), Pd(OAc)2(Palladium II acetate), Pd(PPh3)2 Cl2 (Bis(triphenylphosphine) Palladium II Chloride), CH3COOK (Potassium acetate), PPh3 (Triphenylphosphine), HATU (N,N,N',N'-Tetramethyl-O-(7-Azabenzotriazol-l-yl)uranium hexafluorophosphate, (CO)2Cl2 (Oxalyl chloride), SOCl2 (Thionyl chloride), tBuOK (Potassium tert-butoxide), MeOH (Methanol), MgSO4 (Magnesium sulfate), NMP N-Methyl pyrrolidinone, PetEther (Petroleum ether), it (room temperature). HPLC (High Performance Liquid Chromatography), FC (Flash Chromatography on silica gel), MS (Mass Spectrometry), NMR (Nuclear Magnetic Resonance), PBS (Phosphate Buffered Saline), SPA (Scintillation Proximity Assay), TLC (Thin Layer Chromatography), UV (Ultraviolet).
If the above set of general synthetic methods is not applicable to obtain compounds according to Formula (I) and/or necessary intermediates for the synthesis of compounds of Formula (I), suitable methods of preparation known by a person skilled in the art should be used. In general, the synthesis pathways for any individual compound of Formula (I) will depend on the specific substituents of each molecule and upon the ready availability of intermediates necessary; again such factors being appreciated by those of ordinary skill in the art. For all the protection and deprotection methods, see Philip J. Kocienski, in "Protecting Groups", Georg Thieme Verlag Stuttgart, New York, 1994 and, Theodora W. Greene and Peter G. M. Wuts in "Protective Groups in Organic Synthesis", Wiley Interscience, 3rd Edition 1999.
Compounds of this invention can be isolated in association with solvent molecules by crystallization from evaporation of an appropriate solvent. The pharmaceutically acceptable acid addition salts of the compounds of Formula (I), which contain a basic center, may be prepared in a conventional manner. For example, a solution of the free base may be treated with a suitable acid, either neat or in a suitable solution, and the resulting salt isolated either by filtration or by evaporation under vacuum of the reaction solvent. Pharmaceutically acceptable base addition salts may be obtained in an analogous manner by treating a solution of compound of Formula (I) with a suitable base. Both types of salts may be formed or interconverted using ion-exchange resin techniques.
In the following the present invention shall be illustrated by means of some examples, which are not construed to be viewed as limiting the scope of the invention.
EXPERIMENTAL PART
The HPLC, NMR and MS data provided in the examples described below are obtained as followed: HPLC: column Waters Symmetry C8 50 x 4.6 mm, Conditions: MeCN/H2O, 5 to 100% (8 min), max plot 230^00 nm; Mass spectra: PE-SCIEX API 150 EX (APCI and ESI), LC/MS spectra: Waters ZMD (ES); 1H-NMR: Bruker DPX-300MHz.
The preparative HPLC purifications are performed with HPLC Waters Prep LC 4000 System equipped with columns Prep Nova-Pak®HR C 186 μm 6θA, 40x30mm (up to lOOmg) or with XTerra® Prep MS C8, 10 μm, 50x300mm (up to Ig). AU the purifications are performed with a gradient of MeCNZH2O 0.09% TFA. The semi-preparative reverse- phase HPLC are performed with the Biotage Parallex Flex System equipped with columns Supelcosil™ ABZ+Plus (25 cm x 21.2 mm, 12 μm); UV detection at 254 nm and 220 nm; flow 20 mL/min (up to 50 mg). TLC Analysis is performed on Merck Precoated 60 F254 plates. Purifications by flash chromatography are performed on SiO2 support, using cyclohexane/EtOAc or DCM/MeOH mixtures as eluents.
Intermediate 1 : 2-(trifluoiOmethyl)benzenesulfonamide (cf. Scheme 3, compound XXI)
Figure imgf000049_0001
To a solution of 2-(trifluoromethyl)benzenesulfonyl chloride (5g; 20.44 mmol; 1.00 eq.) in anhydrous THF (5.00 ml) was added a solution of 71 ml Ammonia in Ethanol 2M under nitrogen at room temperature. The reaction mixture was shaken for 2Oh at room temperature. The solvent was evaporated and the residue redissolved in EtOAc(15OmL) and then washed with NH4Cl saturated aqueous solution (5OmL) and brine (5OmL). The organic layer was dried over MgSO4, filtered and the solvent evaporated to give the pure 2- (trifluoromethyl)benzenesulfonamide as a yellowish solid (4.6g, 89% yield, 98.6% HPLC purity). This compound was utilized as such for the next reaction.
IH NMR (300MHz, CDCl3); 5.0 (m, 2H), 7.6 (m, 2H), 7.8 (m, IH), 8.3 (m, IH). MS(ESr): 224.1.
Intermediate 2: 2-chloro-N-(3-chloropyrazin-2-yl)benzenesulfonamide (cf. Scheme 2, compound III)
Figure imgf000049_0002
2,3-dichloropyrazine (Ig; 6.71 mmol; 1.00 eq.) and 2-dichlorobenzenesulfonamide (1.29g; 6.71mmol; 1.00 eq.) were stirred in NMP (9ml). To this reaction mixture was added cesium carbonate (2g; 6mmol; 0.90 eq.) and the reaction mixture was stirred and heated up to 1300C for 2Oh. The reaction was cooled down to room temperature, added to water 98ml and washed with AcOEt (2x30ml). The aqueous phase was acidified with citric acid and extraced with AcOEt (3x60ml). The organic extracts were combined, washed with brine (10ml), dried over MgSO4 and evaporated down. The residue was purified by Flash master using a gradient AcOEt/cHex 2:8 to AcOEt 100% in 45 min, the title compound was isolated, after filtration and evaporation. The solid was recrystallized in a mixture EtOAc:Chex (30:70) to give the pure 2-chloro-N-(3-chloropyrazin-2-yl)benzene sulfonamide as a yellowish solid (Ig, 49% yield, 100%HPLC purity).
IH NMR (300MHz, CDCl3); 7.3-7.5 (m, 3H), 7.8-8.0 (m, 3H), 8.3 (m, IH). MS(ESI+): 304.1; MS(ESI ): 302.0.
Intermediate 3 : N-(3 -chloropyrazin^-y^-ftrifluoromethyDbenzenesulfonamide (cf. Scheme 2, compound III)
Figure imgf000050_0001
Following the general method as outlined for Intermediate 2, starting from 2,3- dichloropyrazine and 2-(trifluoromethyl)benzenesulfonamide, the title compound was isolated, after evaporation and recrystallization, as a yellowish solid in 63% yield (97 % purity by HPLC).
IH NMR (300MHz, CDCl3); 7.6-7.8 (m, 4H), 7.9-8.1 (m, 2H), 8.5 (m, IH). MS(ESI+): 338.0; MS(ESI ): 336.0. Intermediate 4: 2-chloro-N-{3-r4-(hvdroxymethyl)phenyl1pyrazin-2-yl| benzene sulfonamide
(cf. Scheme 4, compound IVa)
Figure imgf000051_0001
2-chloiO-N-(3-chloropyrazin-2-yl)benzenesulfonamide (2.2g; 7.23 mmol; 1.00 eq.) and 4- hydroxymethyl benzene boronic acid (1.21g; 7.96 mmol; 1.10 eq.) were dissolved in 48mL of a 1:1 mixture of Dioxane:MeOH that was previously degassed. Potassium carbonate (2.75g; 19.89 mmol; 2.75 eq.) and triphenylphosphine (284.58 mg; 1.08 mmol; 0.15 eq.) were added to the reaction mixture under nitrogen, followed by palladium II (81.19 mg; 0.36 mmol; 0.05 eq.). The reaction mixture was then heated at 1100C under N2 for 30minutes. The reaction mixture was cooled down to room temperature, diluted with diethyl ether (5OmL) and water (25mL) and filtered through celite. The aqueous layer was separated and the organic layer washed with water (5OmL). The combined aqueous solutions were washed with diethyl ether (5OmL), then acidified aqueous layer with HCl 5N and extracted with AcOEt. The organic extracts were combined, washed with brine (10ml), dried over MgSO4 and evaporated down to give the pure 2-chloro-N-{3-[4- (hydroxymethyl)phenyl]pyrazin-2-yl} benzene sulfonamide as a yellowish solid (2.5g, 91% yield, 98% HPLC purity). This compound was used as such for the next reaction.
IH NMR (300MHz, CDCl3); 4.68 (m, 2H), 7.5-7.7 (m, 7H), 8.1-8.2 (m, 3H), 8.3 (m, IH). MS(ESI+): 376.1; MS(ESI ): 374.1. Intermediate 5: 2-trifluoromethyl-N-{3-r4-(hvdroxymethyl)phenyl1pyrazin-2-yl| benzene sulfonamide
(cf. Scheme 4, compound IVa)
Figure imgf000052_0001
Following the general method as outlined for Intermediate 4, starting from N-(3- chloropyrazin-2-yl)-2-(trifluoromethyl)benzenesulfonamide and 4-hydroxymethyl benzene boronic acid, the title compound was isolated, after evaporation and recrystallization, as a yellowish solid in 85% yield (97 % purity by HPLC).
IH NMR (300MHz, CDCl3); 4.83 (m, 2H), 7.5-7.9 (m, 8H), 8.1 (m, IH), 8.3 (m, IH), 8.64 (m, IH). MS(ESI+): 410.3; MS(ESI ): 408.5.
Intermediate 6: 4-(3-{r(2-chlorophenyl)sulfonyl1amino|pyrazin-2-yl)benzoic acid (cf. Scheme 5, compound IVb)
Figure imgf000052_0002
Following the general method as outlined for Intermediate 4, starting from 2-chloro-N-(3- chloropyrazin-2-yl)benzenesulfonamide and 4-carboxybenzene boronic acid, the title compound was isolated, after evaporation and recrystallization, as a yellowish solid in 83% yield (96 % purity by HPLC). IH NMR (300MHz, CDCl3); 7.5-7.7 (m, 4H), 7.9-8.0 (m, 2H), 8.1-8.4 (m, 5H). MS(ESI+): 390.8; MS(ESI ): 388.9.
Intermediate 7: 4-(3-{r(2-trifluoromethylphenyl)sulfonyl1amino|pyrazin-2-yl)benzoic acid (cf. Scheme 5, compound IVb)
Figure imgf000053_0001
Following the general method as outlined for Intermediate 4, starting from N-(3- chloropyrazin-2-yl)-2-(trifluoromethyl)benzenesulfonamide and 4-carboxybenzene boronic acid, the title compound was isolated, after evaporation and recrystallization, as a yellowish solid in 80% yield (98 % purity by HPLC).
MS(ESI+): 424.4; MS(ESI ): 422.2.
Intermediate 8: 2-chloro-N-{3-r4-(chloromethyl)phenyl1pyrazin-2-yl|benzene-sulfonamide
(cf. Scheme 4, compound Vb)
Figure imgf000053_0002
2-chloro-N-{3-[4-(hydroxymethyl)phenyl]pyrazin-2-yl} benzene sulfonamide (3.15g; 8.4 mmol; 1.00 eq.) was dissolved in dichloromethane (8OmL) and thionyl chloride (8.5mL,
117mmol, 14eq.) was added dropwise. The reaction mixture was stirred overnight. The reaction mixture was poured careiully into ice/water (20OmL) and stirred until clear layers were formed. The mixture was separated and the organic layer was dried over MgSO4 and evaporated down to give the crude solid which was recrystallsied in AcOEt/cyclohexane to give the pure 2-chloro-N-{3-[4-(chloromethyl)phenyl]pyrazin-2-yl}benzenesulfonamide as a white solid (3.02 g, 95% yield, 99% HPLC purity).
IH NMR (300MHz, CDCl3); 4.69 (m, 2H), 7.45-7.6 (m, 3H), 7.65-7.7 (m, 5H), 8.0 (m, IH), 8.3 (m, IH), 8.38 (m, IH). MS(ESI+): 396.1; MS(ESI ): 393.1.
Intermediate 9 : N- {3 -r4-(chloromethyl)phenyl1pyrazin-2-yl| -2-(trifluoromethyl) benzenesulfonamide (cf. Scheme 4, compound Vb)
Figure imgf000054_0001
Following the general method as outlined for Intermediate 8, starting from 2- trifluoromethyl-N-{3-[4-(hydroxymethyl)phenyl]pyrazin-2-yl} benzene sulfonamide and thionyl chloride, the title compound was isolated, after evaporation and recrystallization, as a white solid in 96% yield (97 % purity by HPLC).
MS(ESI+): 428.9; MS(ESI ): 426.7.
Intermediate 10: N-[3-(3-hydroxyprop-l-yn-l-yl')pyrazin-2-yll-2-(trifluoromethyl') benzenesulfonamide
(cf. Scheme 8, compound Villa)
Figure imgf000055_0001
Method A:
N-(3-chloropyrazin-2-yl)-2-(trifluoromethyl)benzenesulfonamide (1.35g; 4.0 mmol; 1.00 eq.) and 2-propyn-l-ol (336mg; 6.0 mmol; 1.5 eq.) were dissolved in 1OmL of DMF under nitrogen atmosphere. To the reaction mixture was added CH3COOK (588mg; 6.0 mmol; 1.5 eq.) and Pd(PPh3)4 (232 mg; 0.2 mmol) under nitrogen. The reaction mixture was then heated at 1000C under nitrogen for 2hours. After removal of the solvent by distillation in vacuo, the residue was triturated with water (4OmL) and extracted with diethyl ether (3x30mL). The organic layer was dried over MgSO4 and evaporated down. The crude product was purified by silica gel column chromatography using a mixture of hexane and AcOEt to give pure N-[3-(3-hydroxyprop-l-yn-l-yl)pyrazin-2-yl]-2-(trifluoromethyl) benzenesulfonamide as a yellowish solid (686mg, 48% yield, 98% HPLC purity).
Method B: N-(3-chloropyrazin-2-yl)-2-(trifluoromethyl)benzenesulfonamide (1.35g; 4.0 mmol; 1.00 eq.) and 2-propyn-l-ol (336mg 6.0 mmol; 1.5 eq.) were dissolved in 1OmL of DMF under nitrogen atmosphere. To the reaction mixture was added CH3COOK (588mg; 6.0 mmol; 1.5 eq.) CuI (40mg; 0.2 mmol; 0.05 eq.) and Pd(PPh3)2Cl2 (28mg; 0.04 mmol) under nitrogen. The reaction mixture was then heated at 1000C under nitrogen for 2hours. After removal of the solvent by distillation in vacuo, the residue was triturated with water (4OmL) and extracted with diethyl ether (3x30mL). The organic layer was dried over MgSO4 and evapored down. The crude product was purified by silica gel column chromatography using a mixture of hexane and AcOEt to give pure N-[3-(3-hydroxyprop-l-yn-l-yl)pyrazin-2-yl]- 2-(trifluoromethyl) benzenesulfonamide as a yellowish solid (702mg, 50% yield, 98% HPLC purity). MS(ESI+): 358.6; MS(ESI ): 356.5.
Intermediate 11: N-(3-piperazin-l-ylpyrazin-2-ylV2-(trifluoromethyl)benzenesulfonamide (cf. Scheme 10, compound XI)
Figure imgf000056_0001
tert-butyl 4-[3-({[2-(trifluoromethyl)phenyl]sulfonyl}amino)pyrazin-2-yl]piperazine-l- carboxylate (1.46g, 3mmol) was dissolved in dichloromethane (5OmL) and trifluoroacetic acid (4.5g, 40mmol) was added at 0 0C. The reaction mixture was stirred for 2h. The solvents were evaporated and the residue redissolved in dichloromethane (50ml) and evaporated to dryness to give the expected product N-(3-piperazin-l-ylpyrazin-2-yl)-2- (trifluoromethyl)benzenesulfonamide as a yellow solid (l.lg, 95% yield, 95 % purity by HPLC).
MS(ESI+): 388.4; MS(ESI ): 386.3.
Example 1: General procedure for the synthesis of 2.3-substituted pyrazine sulfonamide derivatives of general formula L with A and Z as above defined (Schemes 1, 4, 5, 6, 7, 8, 9 and 10): N- { 3 -\4-( 1 H-indol- 1 -ylmethyl)phenyl1pyrazin-2-yl| -2-(trifluoromethyl)benzene- sulfonamide
Figure imgf000057_0001
Method A:
To a solution of lH-Indole (234mg, 2.0mmol, leq) in dimethylformamide (1OmL) was added sodium hydride (80mg, 2mmol, leq). After the evolution of hydrogen ceased, N-{3- [4-(chloromethyl)phenyl]pyrazin-2-yl} -2-(trifluoromethyl) benzenesulfonamide
(intermediate 26) (854mg, 2mmol, leq) in dimethylformamide (5mL) was added and the reaction mixture heated to 80 degrees over 3hours. The reaction was cooled, diluted with 3OmL of water and extracted with diethyl ether. The organic layer was dried over MgSO4, evaporated and purified by flash chromatography on silica gel eluting with AcOEt and cyclohexane to give pure N-{3-[4-(lH-indol-l-ylmethyl)phenyl]pyrazin-2-yl}-2- (trifluoromethyl)benzenesulfonamide as a yellow solid (630mg, 1.24mmol, yield: 62%, 97% HPLC purity).
Method B:
N- {3-[4-(chloromethyl)phenyl]pyrazin-2-yl} -2-(trifluoromethyl) benzene sulfonamide (intermediate 26) (854mg, 2mmol, leq) and lH-Indole (234mg, 2.0mmol, leq) were shaken in tetrahydrofuran (2OmL) and heated up to 50 degrees for lOminutes. To the reaction mixture was added potassium tert-butoxide (4.5mL of a IM solution in THF). The reaction mixture was maintained to 50 degrees for 5h, and then cooled down to room temperature. The reaction mixture was treated with 10ml of an aqueous citric acid solution (2Og in 10OmL of water) and extracted with AcOEt. The organic layer was dried over
MgSO4 and evaporated. The crude was purified similarly to Method A to give pure N- {3- [4-(lH-indol-l-ylmethyl)phenyl]pyrazin-2-yl}-2-(trifluoromethyl)benzenesulfonamide as a yellow solid (691mg, 1.36mmol, yield: 68%, 98% HPLC purity).
N-{3-r4-(lH-indol-l-ylmethyl)phenyl1pyrazin-2-yl|-2-(trifluoromethyl)benzene sulfonamide: yellow solid; 1K NMR (300 MHz, CDCl3); 5.50 (m, 2H), 6.5 (m, IH), 7.0-7.2 (m, 2H), 7.4-7.65 (m, 8H), 7.65-7.7 (m, 2H), 8.0 (m, 2H), 8.3 (m,lH), 8.38 (m,lH). MS (ESI+) 509.5, (ESI-) 507.6.
Example 2: 2-chloiO-N-{3-[4-({methyl[4-(trifluoromethoxy')phenyllamino|-methylV phenvHpyrazin-2-yl|benzenesulfonamide
Figure imgf000058_0001
Following the general methods as outlined in Example 1 (Method B), starting from 2- chloro-N-{3-[4-(chloiOmethyl)phenyl]pyrazin-2-yl}benzenesulfonamide (Intermediate 8), and N-methyl-4-(trifluoromethoxy)aniline, the title compound was isolated as a yellow solid in 72% yield (99% purity by HPLC).
MS(ESI+): 550.1; MS(ESI ): 547.8.
Example 3: N-(3-{4-r(2-ethyl-lH-benzimidazol-l-yl)methyl1phenyl|pyrazin-2-yl)-2- (trifluoromethvDbenzenesulfonamide
Following the general method as outlined in Example 1 (Method B), starting from N- {3 -[4- (chloromethyl)phenyl]pyrazin-2-yl} -2-(trifluoromethyl) benzenesulfonamide (Intermediate 9), and 2-ethylbenzimidazole, the title compound was isolated as a yellow solid in 63% yield (96% purity by HPLC).
MS(ESI+): 538.6; MS(ESI ): 536.5.
Example 4: 2-chloro-N-[3-(4-{[methyl(phenyl)amino]methyl}phenyl)pyrazin-2-yl]- benzenesulfonamide
Figure imgf000059_0002
Following the general method as outlined in Example 1 (Method B), starting from 2- chloro-N-{3-[4-(chloromethyl)phenyl]pyrazin-2-yl}benzenesulfonamide (Intermediate 8), and N-methyl-aniline, the title compound was isolated as a yellow solid in 83% yield (99% purity by HPLC).
MS(ESI+): 465.6; MS(ESI ): 463.8. Example 5 : 2-chloro-N-(3- {4-r(2-naphtfayloxy)methyl1phenyl|pyrazin-2-yl)benzene- sulfonamide
Figure imgf000060_0001
Following the general method as outlined in Example 1 (Method A), starting from 2- chloro-N-{3-[4-(chloiOmethyl)phenyl]pyrazin-2-yl}benzenesulfonamide (Intermediate 8), and 2-hydroxy naphthalene, the title compound was isolated as a yellow solid in 72% yield (99% purity by HPLC).
MS(ESI+): 503.4; MS(ESI ): 501.2.
Example 6: 2-chloro-N-{3-r4-(lH-indol-l -ylmethyl)phenyl1pyrazin-2-yl|benzene- sulfonamide
Figure imgf000060_0002
Following the general method as outlined in Example 1 (Method B), starting from 2- chloro-N-{3-[4-(chloiOmethyl)phenyl]pyrazin-2-yl}benzenesulfonamide (Intermediate 8), and 1-H-Indole, the title compound was isolated as a yellow solid in 71% yield (98% purity by HPLC).
MS(ESI+): 475.9; MS(ESI ): 473.5. Example 7: 2-chloro-N-(3-{4-r(5,6,7,8-tetrahvdronaphthalen-2-yloxy)methyl1-phenyl|- Pyrazin-2-yl)benzenesulfonamide
Figure imgf000061_0001
Following the general method as outlined in Example 1 (Method B), starting from 2- chloro-N-{3-[4-(chloromethyl)phenyl]pyrazin-2-yl}benzenesulfonamide (Intermediate 8), and 6-hydroxy-l,2,3,4-tetrahydronaphtalene, the title compound was isolated as a yellow solid in 69% yield (99% purity by HPLC). MS(ESI+): 507.6; MS(ESI ): 505.2.
Example 8: 2-chloro-N-(3-{4-[(2-ethyl-lH-benzimidazol-l-yl')methyl]phenyl|pyrazin-2- vDbenzenesulfonamide
Figure imgf000061_0002
Following the general method as outlined in Example 1 (Method B), starting from 2- chloro-N-{3-[4-(chloromethyl)phenyl]pyrazin-2-yl}benzenesulfonamide (Intermediate 8), and 2-ethyl benzimidazole, the title compound was isolated as a yellow solid in 65% yield (96% purity by HPLC).
MS(ESI+): 505.4; MS(ESI ): 503.2. Example 9: N-(3- {4-IY1 ,3-benzodioxol-5-ylamino)methyl1phenyl|pyrazin-2-ylV2- (trifluoromethvDbenzenesulfonamide
Figure imgf000062_0001
Following the general method as outlined in Example 1 (Method B), starting from N- {3 -[4- (chloromethyl)phenyl]pyrazin-2-yl}-2-(trifluoromethyl) benzenesulfonamide (Intermediate 9), and 3,4-(methylenedioxy)aniline, the title compound was isolated as a yellow solid in 69% yield (96% purity by HPLC).
MS(ESI+): 529.7; MS(ESI ): 527.5.
Example 10: N- [3 -(4- { [(3 -methoxybenzyl)oxy]methyl| phenyDpyrazin-2-yl]-2-
(trifluoromethvDbenzenesulfonamide
Figure imgf000062_0002
Following the general method as outlined in Example 1 (Method B), starting from N- {3 -[4- (chloromethyl)phenyl]pyrazin-2-yl} -2-(trifluoromethyl) benzenesulfonamide (Intermediate 9), and 3-anisyl alcohol, the title compound was isolated as a yellow solid in 64% yield (92% purity by HPLC).
MS(ESI+): 530.4; MS(ESI ): 528.8. Example 11: 3-chloro-N-{3-r4-({metfavir4-(trifluoromethoxy)phenyl1amino|methyl) phenyllpyrazin-2-yllbenzenesulfonamide
Figure imgf000063_0001
Following the general method as outlined in Example 1 (Method B), starting from 3- chloro-N-{3-[4-(chloromethyl)phenyl]pyrazin-2-yl}benzenesulfonamide, and N-methyl-4- (trifluoromethoxy)aniline, the title compound was isolated as a yellow solid in 69% yield (94% purity by HPLC).
MS(ESI+): 550.2; MS(ESI ): 547.6.
Example 12: N-[3-(4-{ [(4-chlorophenyl)(methyl)amino]methyl|phenyl)pyrazin-2-yl]- thiophene-2 -sulfonamide
Figure imgf000063_0002
Following the general method as outlined in Example 1 (Method B), starting from N- {3 -[4- (chloromethyl)phenyl]pyrazin-2-yl} thiophene-2-sulfonamide, and N-methyl-4-chloro aniline, the title compound was isolated as a yellow solid in 69% yield (94% purity by HPLC).
MS(ESI+): 472.8; MS(ESI ): 470.7. Example 13 : 4-phenoxy-N- {3-r4-(quinolin-2-ylmethyl)piperazin-l -vHpyrazin-2-yl| - benzenesulfonamide
Figure imgf000064_0001
To a solution of 4-phenoxy-N-(3-piperazin-l-ylpyrazin-2-yl)benzenesulfonamide (411mg, l.Ommol, leq) in dimethylformamide (1OmL) was added 2-(chloromethyl)quinoline hydrochloride (214mg, lmmol, leq) and DIPEA (322mg, 2.5mmol, 2.5eq). The reaction mixture was heated to 50 degrees over lhour. The reaction was cooled, diluted with 3OmL of water and extracted with diethyl ether. The organic layer was dried over MgSO4, evaporated and purified by flash chromatography on silica gel eluting with AcOEt and cyclohexane to give pure 4-phenoxy-N-{3-[4-(quinolin-2-ylmethyl)piperazin-l-yl]pyrazin-
2-yl}benzenesulfonamide as a yellow solid (419mg, 0.76mmol, yield: 76%, 97% HPLC purity).
MS (ESI+) 553.6, (ESI-) 551.2.
Example 14j 4-methyl-N- {3-F4-({ methvir4-(trifluoromethoxy)phenyl1amino I - methyl)phenyl1pyrazin-2-yl|benzenesulfonamide
Figure imgf000064_0002
Following the general method as outlined in Example 1 (Method B), starting from N- {3 -[4- (chloromethyl)phenyl]pyrazin-2-yl} -4-methylbenzenesulfonamide, and N-methyl-4- (trifluoromethoxy)aniline, the title compound was isolated as a yellow solid in 69% yield (94% purity by HPLC).
MS(ESI+): 529.5; MS(ESI ): 526.6.
Example 15: 4-chloro-N-r3-(4-{rmethyl(phenyl)amino1methyl|phenyl)pyrazin-2-yl1- benzenesulfonamide
Figure imgf000065_0001
Following the general method as outlined in Example 1 (Method B), starting from 4- chloro-N-{3-[4-(chloiOmethyl)phenyl]pyrazin-2-yl}benzenesulfonamide, and N-methyl- aniline, the title compound was isolated as a yellow solid in 76% yield (96% purity by HPLC).
MS(ESI+): 465.6; MS(ESI ): 463.7.
Example 16: 4-cyano-N- {3-F4-({ methvir4-(trifluoromethoxy)phenyl1amino I - methyl)phenyl1pyrazin-2-yl|benzenesulfonamide
Figure imgf000065_0002
Following the general method as outlined in Example 1 (Method D), N- {3 -[4- (chloromethyl)phenyl]pyrazin-2-yl} -4-cyanobenzenesulfonamide, and N-methyl-4- (trifluoromethoxy)aniline, the title compounds were isolated as a yellow solid in 70% yield (92% purity by HPLC).
MS(ESI+): 540.6; MS(ESI ): 538.5.
Example 17: N-r3-(4-{r(4-Fluoro-phenyl)-methyl-amino1-methyl|-phenyl)-pyrazin-2-yl1-2- trifluoromethyl-benzenesulfonamide
Figure imgf000066_0001
Following the general method as outlined in Example 1 (Method B), starting from N-{3-[4- (chloromethyl)phenyl]pyrazin-2-yl}-2-(trifluoromethyl) benzenesulfonamide (Intermediate 9), and 4-Fluoro-N-methylaniline, the title compound was isolated as a yellow solid in 78% yield (98% purity by HPLC).
MS(ESI+): 517.9; MS(ESI ): 515.8.
Example l_8j N-(3- {4-[(Methyl-phenyl-aminoVmethyl]-phenyl| -pyrazin-2-yl>2- trifluoromethyl-benzenesulfonamide
Figure imgf000066_0002
Following the general method as outlined in Example 1 (Method B), starting from N- {3 -[4- (chloromethyl)phenyl]pyrazin-2-yl} -2-(trifluoromethyl) benzenesulfonamide (Intermediate 9), and N-methylaniline, the title compound was isolated as a yellow solid in 75% yield (99% purity by HPLC).
MS(ESI+): 499.9; MS(ESI ): 497.8.
Example 19: N-r3-(4-{r(4-Cvano-phenyl)-methyl-amino1-methyl|-phenyl)-pyrazin-2-yl1-2- trifluoromethyl-benzenesulfonamide
Figure imgf000067_0001
Following the general method as outlined in Example 1 (Method B), starting from N- {3 -[4- (chloromethyl)phenyl]pyrazin-2-yl}-2-(trifluoromethyl) benzenesulfonamide (Intermediate 9), and 4-(N-methylamino)benzonitrile, the title compound was isolated as a yellow solid in 71% yield (94% purity by HPLC).
MS(ESI+): 524.6; MS(ESI ): 522.4.
Example 20: N-{3-[4-(4-Fluoro-phenoxymethylVphenyll-pyrazin-2-yl|-2-trifluoromethyl- benzenesulfonamide
Figure imgf000067_0002
Following the general method as outlined in Example 1 (Method A), starting from N- {3 -[4- (chloromethyl)phenyl]pyrazin-2-yl} -2-(trifluoromethyl) benzenesulfonamide (Intermediate 9), and 4-fluorophenol, the title compound was isolated as a yellow solid in 67% yield (95% purity by HPLC).
MS(ESI+): 504.6; MS(ESI ): 502.6.
Example 21j N-(3 - {4-r(Εthyl-phenyl-amino Vmethyli-phenyll -p yrazin-2-ylV2- trifluoromethyl-benzenesulfonamide
Figure imgf000068_0001
Following the general method as outlined in Example 1 (Method B), starting from N- {3 -[4- (chloromethyl)phenyl]pyrazin-2-yl}-2-(trifluoromethyl) benzenesulfonamide (Intermediate 9), and N-ethylaniline, the title compound was isolated as a yellow solid in 70% yield (96% purity by HPLC).
MS(ESI+): 513.6; MS(ESI ): 511.7.
Example 22 : N- { 3 -[4-(2.3 -Dihydro-benzof 1.4] oxazin-4-ylmethylVphenyll -pyrazin-2- yll-2-trifluoromethyl-benzenesulfonamide
Figure imgf000068_0002
Following the general method as outlined in Example 1 (Method B), starting from N-{3-[4- (chloromethyl)phenyl]pyrazin-2-yl} -2-(trifluoromethyl) benzenesulfonamide (Intermediate 9), and 3,4-dihydro-2H-l,4-benzoxazine, the title compound was isolated as a yellow solid in 65% yield (97% purity by HPLC).
MS(ESI+): 527.7; MS(ESI ): 525.5.
Example 23: N-r3-(4-{r(3-Fluoro-phenyl)-methyl-amino1-methyl|-phenyl)-pyrazin-2-yl1-2- trifluoromethyl-benzenesulfonamide
Figure imgf000069_0001
Following the general method as outlined in Example 1 (Method B), starting from N-{3-[4- (chloromethyl)phenyl]pyrazin-2-yl}-2-(trifluoromethyl) benzenesulfonamide (Intermediate 9), and 3-Fluoro-N-methylaniline, the title compound was isolated as a yellow solid in 69% yield (92% purity by HPLC).
MS(ESI+): 517.7; MS(ESI ): 515.6.
Example 24: N-{3-[4-(6-Chloro-pyridin-3-yloxymethylVphenyll-pyrazin-2-yl|-2- trifluoromethyl-benzenesulfonamide
Figure imgf000069_0002
Following the general method as outlined in Example 1 (Method A), starting from N- {3 -[4- (chloromethyl)phenyl]pyrazin-2-yl} -2-(trifluoromethyl) benzenesulfonamide (Intermediate 9), and 2-chloro-5-hydroxy-pyridine, the title compound was isolated as a yellow solid in 73% yield (98% purity by HPLC).
MS(ESI+): 522.1; MS(ESI ): 520.1.
Example 25 : N- {3 -r4-(2-Pyridin-2-yl-indol- 1 -ylmethyl)-phenyl1-pyrazin-2-yl| -2- trifluoromethyl-benzenesulfonamide
Figure imgf000070_0001
Following the general method as outlined in Example 1 (Method A), starting from N- {3 -[4- (chloromethyl)phenyl]pyrazin-2-yl}-2-(trifluoromethyl) benzenesulfonamide (Intermediate 9), and 2-pyridine-2-yl-lH-indole, the title compound was isolated as a yellow solid in 56% yield (92% purity by HPLC).
MS(ESI+): 586.8; MS(ESI ): 584.6.
Example 26: N-{3-[4-(5-FluoiO-indol-l-ylmethylVphenyll-pyrazin-2-yl|-2- trifluoromethyl-benzenesulfonamide
Figure imgf000070_0002
Following the general method as outlined in Example 1 (Method A), starting from N- {3 -[4- (chloromethyl)phenyl]pyrazin-2-yl} -2-(trifluoromethyl) benzenesulfonamide (Intermediate 9), and 5-fluoro-indole, the title compound was isolated as a yellow solid in 69% yield (99% purity by HPLC).
MS(ESI+): 527.6; MS(ESI ): 525.7.
Example Th N-r3-(4-Phenoxymethyl-phenyl)-pyrazin-2-yl1-2-trifluoromethyl- benzenesulfonamide
Figure imgf000071_0001
Following the general method as outlined in Example 1 (Method A), starting from N- {3 -[4- (chloromethyl)phenyl]pyrazin-2-yl}-2-(trifluoromethyl) benzenesulfonamide (Intermediate 9), and phenol, the title compound was isolated as a yellow solid in 75% yield (98% purity by HPLC).
MS(ESI+): 486.8; MS(ESI ): 484.7.
Example 28: N-[3-(4-{[(4-Chloro-phenylVmethyl-amino]-methyl|-phenylVpyrazin-2-yl]- 2-trifluoromethyl-benzenesulfonamide
Figure imgf000071_0002
Following the general method as outlined in Example 1 (Method B), starting from N- {3 -[4- (chloromethyl)phenyl]pyrazin-2-yl} -2-(trifluoromethyl) benzenesulfonamide (Intermediate 9), and 4-chloro-N-methylaniline, the title compound was isolated as a yellow solid in 72% yield (94% purity by HPLC).
MS(ESI+): 534.1; MS(ESI ): 532.1.
Example 29: 2-Chloro-N-r3-(4-{r(4-cvano-phenyl)-methyl-amino1-methyl|-phenylV Pyrazin-2-vH-benzenesulfonamide
Figure imgf000072_0001
Following the general method as outlined in Example 1 (Method B), starting from N- {3 -[4- (chloromethyl)phenyl]pyrazin-2-yl}-2-(chloro) benzenesulfonamide (Intermediate 8), and 4-(N-methylamino)-benzonitrile, the title compound was isolated as a yellow solid in 52% yield (99% purity by HPLC).
MS(ESI+): 491.0; MS(ESI ): 489.0.
Example 30 : N-|"3 -(4- { |Y3.4-Dichloro-phenyl Vmethyl-amino]-methyl I -phenyD-pyrazin-
2-vH-2-trifluoromethyl-benzenesulfonamide
Figure imgf000073_0001
Following the general method as outlined in Example 1 (Method B), starting from N- {3 -[4- (chloromethyl)phenyl]pyrazin-2-yl} -2-(trifluoromethyl) benzenesulfonamide (Intermediate 9), and 3,4-dichloro-N-methylaniline, the title compound was isolated as a yellow solid in 63% yield (91% purity by HPLC).
MS(ESI+): 569.6; MS(ESI ): 565.1.
Example 31 : N-{3-[4-(4-Cyano-phenoxymethylVphenyll-pyrazin-2-yl|-2-trifluoromethyl- benzenesulfonamide
Figure imgf000073_0002
Following the general method as outlined in Example 1 (Method B), starting from N- {3 -[4- (chloromethyl)phenyl]pyrazin-2-yl} -2-(trifluoromethyl) benzenesulfonamide (Intermediate 9), and 4-cyanophenol, the title compound was isolated as a yellow solid in 73% yield (93% purity by HPLC).
MS(ESI+): 511.6; MS(ESI ): 509.6. Example 32: N- {3 -r4-(6-Fluoro-indol- 1 -ylmethyl)-phenyl1-pyrazin-2-yl| -2- trifluoromethyl-benzenesulfonamide
Figure imgf000074_0001
Following the general method as outlined in Example 1 (Method B), starting from N- {3 -[4- (chloromethyl)phenyl]pyrazin-2-yl}-2-(trifluoromethyl) benzenesulfonamide (Intermediate 9), and 6-fluoro-lH-indole, the title compound was isolated as a yellow solid in 77% yield (97% purity by HPLC).
MS(ESI+): 527.8; MS(ESI ): 525.6.
Example 33 : 2-Chloro-N- {3 -[4-(5-methoxy-2-methyl-indol- 1 -ylmethylVphenyll-pyrazin-2- yl| -benzenesulfonamide
Figure imgf000074_0002
Following the general method as outlined in Example 1 (Method B), starting from N-{3-[4- (chloromethyl)phenyl]pyrazin-2-yl}-2-(chloro) benzenesulfonamide (Intermediate 8), and 2-methyl-5-methoxyindole, the title compound was isolated as a yellow solid in 72% yield (98% purity by HPLC).
MS(ESI+): 520.2; MS(ESI ): 518.3. Example 34: N- {3-r4-(4-Metfaoxy-phenoxymethyl)-phenyl1-pyrazin-2-yl| -2- trifluoromethyl-benzenesulfonamide
Figure imgf000075_0001
Following the general method as outlined in Example 1 (Method B), starting from N- {3 -[4- (chloromethyl)phenyl]pyrazin-2-yl}-2-(trifluoromethyl) benzenesulfonamide (Intermediate 9), and 4-hydroxyanisole, the title compound was isolated as a yellow solid in 48% yield (91% purity by HPLC).
MS(ESI+): 516.6; MS(ESI ): 514.5.
Example 35: N-(3-{4-[rBenzyl-pyridin-2-yl-aminoVmethyl]-phenyl|-pyrazin-2-ylV2- chloro-benzenesulfonamide
Figure imgf000075_0002
Following the general method as outlined in Example 1 (Method B), starting from N- {3 -[4- (chloromethyl)phenyl]pyrazin-2-yl}-2-(chloro) benzenesulfonamide (Intermediate 8), and 2-benzylaminopyridine, the title compound was isolated as a yellow solid in 35% yield (94% purity by HPLC).
MS(ESI+): 543.3; MS(ESI ): 541.3. Example 36; N-{3-r4-(2,3-DihvdiO-indol-l-ylmethyl)-phenyl1-pyrazin-2-yl|-2- trifluoromethyl-benzenesulfonamide
Figure imgf000076_0001
Following the general method as outlined in Example 1 (Method B), starting from N- {3 -[4- (chloromethyl)phenyl]pyrazin-2-yl}-2-(trifluoromethyl) benzenesulfonamide (Intermediate 9), and 2,3-dihydro-lH-indole, the title compound was isolated as a yellow solid in 66% yield (94% purity by HPLC).
MS(ESI+): 511.6; MS(ESI ): 509.4.
Example 37: N-[3-(4-{[(2.4-Dichloro-phenylVmethyl-amino]-methyl|-phenylVpyrazin-2- vH-2-trifluoromefeyl-benzenesulfonamide
Figure imgf000076_0002
Following the general method as outlined in Example 1 (Method B), starting from N- {3 -[4- (chloromethyl)phenyl]pyrazin-2-yl} -2-(trifluoromethyl) benzenesulfonamide (Intermediate 9), and 2,4-dichloro-N-methylaniline, the title compound was isolated as a yellow solid in 69% yield (96% purity by HPLC).
MS(ESI+): 569.6; MS(ESI ): 566.8. Example 38 : N- {3 -[4-Q -Chloro-phenoxymethylVphenyli-pyrazin-2-yll -2-trifluoromethyl- benzenesulfonamide
Figure imgf000077_0001
Following the general method as outlined in Example 1 (Method A), starting from N- {3 -[4- (chloromethyl)phenyl]pyrazin-2-yl}-2-(trifluoromethyl) benzenesulfonamide (Intermediate 9), and 3-chlorophenol, the title compound was isolated as a yellow solid in 70% yield (98% purity by HPLC).
MS(ESI+): 521.0; MS(ESI ): 519.0.
Example 39: 2-Chloro-N-r3-(4-{r(2,4-difluoiO-phenyl)-methyl-amino1-methyl|-phenylV pyrazin-2-vH-benzenesulfonamide
Figure imgf000077_0002
Following the general method as outlined in Example 1 (Method B), starting from N- {3 -[4- (chloromethyl)phenyl]pyrazin-2-yl}-2-(chloro) benzenesulfonamide (Intermediate 8), and 2,4-difluoro-N-methylaniline, the title compound was isolated as a yellow solid in 77% yield (92% purity by HPLC).
MS(ESI+): 502.0; MS(ESI ): 500.0. Example 40: N- { 3-r4-(2-Methyl-indol- 1 -ylmethylVphenyli-pyrazin-2-ylj -2- trifluoromethyl-benzenesulfonamide
Figure imgf000078_0001
Following the general method as outlined in Example 1 (Method A), starting from N- {3 -[4- (chloromethyl)phenyl]pyrazin-2-yl}-2-(trifluoromethyl) benzenesulfonamide (Intermediate 9), and 2-methyl-l-H-indole, the title compound was isolated as a yellow solid in 70% yield (98% purity by HPLC).
MS(ESI+): 523.5; MS(ESI ): 521.5.
Example 41 : 2-ChloiO-N-{3-[4-(5-fluoro-indol-l-ylmethylVphenyll-pyrazin-2-yl|- benzenesulfonamide
Figure imgf000078_0002
Following the general method as outlined in Example 1 (Method B), starting from 2- chloro-N-{3-[4-(chloiOmethyl)phenyl]pyrazin-2-yl}benzenesulfonamide (Intermediate 8), and 5-fluoroindole, the title compound was isolated as a yellow solid in 72% yield (96% purity by HPLC).
MS(ESI+): 493.9; MS(ESI ): 491.9 Example 42: 2-Chloro-N-r3-(4-{r(2-fluoiO-phenyl)-methyl-amino1-methyl|-phenylV pyrazin-2-vH-benzenesulfonamide
Figure imgf000079_0001
Following the general method as outlined in Example 1 (Method B), starting from 2- chloro-N-{3-[4-(chloromethyl)phenyl]pyrazin-2-yl}benzenesulfonamide (Intermediate 8), and 2-fluoro-N-methyl-aniline, the title compound was isolated as a yellow solid in 79% yield (99% purity by HPLC).
MS(ESI+): 484.1; MS(ESI ): 482.1
Example 43 : 2-Chloro-N- {3-r4-(2-methyl-indol-l -ylmethyl)-phenyl1-pyrazin-2-yl| - benzenesulfonamide
Figure imgf000079_0002
Following the general method as outlined in Example 1 (Method B), starting from 2- chloro-N-{3-[4-(chloromethyl)phenyl]pyrazin-2-yl}benzenesulfonamide (Intermediate 8), and 2-methyl-l-H-indole, the title compound was isolated as a yellow solid in 81% yield (96% purity by HPLC).
MS(ESI+): 490.0; MS(ESI ): 488.1 Example 44: N-(3- {4-r(Ηenzyl-pyridin-2-yl-aminoVmethyl1-phenyl| -pyrazin-2-ylV2- trifluoromethyl-benzenesulfonamide
Figure imgf000080_0001
Following the general method as outlined in Example 1 (Method A), starting from N- {3 -[4- (chloromethyl)phenyl]pyrazin-2-yl}-2-(trifluoromethyl) benzenesulfonamide (Intermediate 9), and N-(2-pyridine)-benzylamine, the title compound was isolated as a yellow solid in 79% yield (98% purity by HPLC).
MS(ESI+): 576.6; MS(ESI ): 574.6.
Example 45: 2-Chloro-N-(3-{4-[(ethyl-pyridin-2-yl-aminoVmethyll-phenyl|-pyrazin-2-ylV benzenesulfonamide
Figure imgf000080_0002
Following the general method as outlined in Example 1 (Method B), starting from 2- chloro-N-{3-[4-(chloiOmethyl)phenyl]pyrazin-2-yl}benzenesulfonamide (Intermediate 8), and 2-(ethylamino)-pyridine, the title compound was isolated as a yellow solid in 64% yield (96% purity by HPLC).
MS(ESI+): 481.0; MS(ESI ): 478.1 Example 46: N-{3-r4-(5-ChloiO-2-methyl-indol-l-ylmethylVphenyl1-pyrazin-2-yl|-2- trifluoromethyl-benzenesulfonamide
Figure imgf000081_0001
Following the general method as outlined in Example 1 (Method A), starting from N-{3-[4- (chloromethyl)phenyl]pyrazin-2-yl}-2-(trifluoromethyl) benzenesulfonamide (Intermediate 9), and 2-methyl-5-chloroindole, the title compound was isolated as a yellow solid in 71% yield (95% purity by HPLC).
MS(ESI+): 558.3; MS(ESI ): 556.4.
Example 47: Preparation of a pharmaceutical formulation
The following formulation examples illustrate representative pharmaceutical compositions according to the present invention being not restricted thereto.
Formulation 1 - Tablets
A 2,3 -substituted pyrazine sulfonamide derivative of formula I is admixed as a dry powder with a dry gelatin binder in an approximate 1:2 weight ratio. A minor amount of magnesium stearate is added as a lubricant. The mixture is formed into 240-270 mg tablets (80-90 mg of active 2,3-substituted pyrazine sulfonamide compound per tablet) in a tablet press.
Formulation 2 - Capsules A 2,3 -substituted pyrazine sulfonamide derivative of formula I is admixed as a dry powder with a starch diluent in an approximate 1:1 weight ratio. The mixture is filled into 250 mg capsules (125 mg of active 2,3-substituted pyrazine sulfonamide compound per capsule).
Formulation 3 - Liquid
A 2,3-substituted pyrazine sulfonamide derivative of formula I (1250 mg), sucrose (1.75 g) and xanthan gum (4 mg) are blended, passed through a No. 10 mesh U.S. sieve, and then mixed with a previously prepared solution of microcrystalline cellulose and sodium carboxymethyl cellulose (11:89, 50 mg) in water. Sodium benzoate (10 mg), flavor, and color are diluted with water and added with stirring. Sufficient water is then added to produce a total volume of 5 ml.
Formulation 4 - Tablets
A 2,3-substituted pyrazine sulfonamide derivative of formula I is admixed as a dry powder with a dry gelatin binder in an approximate 1:2 weight ratio. A minor amount of magnesium stearate is added as a lubricant. The mixture is formed into 450-900 mg tablets (150-300 mg of active 2,3-substituted pyrazine sulfonamide compound) in a tablet press.
Formulation 5 - Injection
A 2,3-substituted pyrazine sulfonamide derivative of formula (I) is dissolved in a buffered sterile saline injectable aqueous medium to a concentration of approximately 5 mg/ml.
BIOLOGICAL ASSAYS
Example 48: Construction of pCEP4-hCRTH2 mammalian expression vector
Human CRTH2 cDNA was amplified by PCR using a human urinary bladder cDNA library as a template and specific primers containing HindIII and BamHI restriction sites for cloning into the pCEP4 vector (Invitrogen). The vector construction is described in detail in Sawyer et al., Br. J. Pharmocol 2002, 137, 1163-72. The nucleotide sequence of the cloned cDNA was identical the previously reported hCRTH2 sequence (Nagata et al, 1999, J. Immunol. 162, 1278-1286).
Example 49: Establishment of a pCEP4-hCRTH2-HEK293 (EBNA) cell line
HEK293 (EBNA) cells were transfected with the pCEP4-hCRTH2 construct using the calcium phosphate technique. Cells were maintained in culture at 37°C in an atmosphere of 5% CO2 in Dulbecco's modified Eagle's F12 medium (Invitrogen), containing 10% heat- inactivated foetal calf serum (TerraCell International, Canada), 2mM Glutamine, lOOunits/ml of penicillin and lOOμg/ml streptomycin (Invitrogen). 48 hours after the transfection, cells were grown in presence of 300μg/ml of Hygromycin B (Invitrogen) for 4 weeks and antibiotic resistant cells were amplified for cell membrane preparation.
Example 50: Preparation of hCRTH2-expressing membranes
Adherent HEK293 (EBNA) cells expressing hCRTH2 were cultured in 225 cm2 cell culture flasks (Corning, USA) in 30ml of medium. After two rinses of phosphate buffered saline (PBS), cells were harvested in 10ml of PBS containing ImM EDTA, centriftiged at 500 x g for 5 min at 4°C and frozen at -800C. The pellet was re-suspended in 50 mM Tris-HCl, pH 7.4, 2mM EDTA, 25OmM Sucrose, containing protease inhibitor cocktail tablets, (Complete EDTA-free, Roche, Germany) and incubated 30 min at 4°C. Cells were disrupted by nitrogen cavitation (Parr Instruments, USA) at 4°C (800 p.s.i. for 30 min), and centrifuged at 500 x g for lOmin at 4°C. Pellet containing nuclei and cellular debris was discarded and supernatant was centriftiged 60 min at 4°C at 45000 x g. Membrane pellet was re-suspended in storage buffer (1OmM HEPES/KOH pH 7.4, ImM EDTA, 25OmM sucrose, protease inhibitor cocktail tablets) using Dounce homogenization and frozen in liquid nitrogen, and stored at -800C. Example 51 : Radioligand binding assay
The compounds of the present invention inhibit the binding of PGD2 to its receptor CRTH2. The inhibitory activity can be investigated by a radioligand binding assay (Sawyer et al., Br. J. Pharmocol 2002, 137, 1163-72). The radioligand binding assay was performed at room temperature in binding buffer (1OmM HEPES/KOH pH 7.4, 1OmM MnCl2, with protease inhibitor cocktail tablets), containing 1.5nM [3H]PGD2 (Amersham, 156 Cie/mmol), and lOμg of hCRTH2 HEK293 (EBNA) cell membrane protein in a final volume of lOOμl in 96 well plates (Corning, USA). Non-specific binding was determined in the presence of lμM PGD2 (Cayman, USA). Competing pyrazine sulfonamides were diluted in dimethylsulphoxide so that the totale volume of dimethylsulfoxide was kept constant at 1% dimethylsulphoxide (Me2SO). 10 μl of the pyrazine sulfonamides were added. Incubation (60min at room temperature) was terminated by rapid filtration through 96 wells hydrophobic GF/C Unifilter plates (Whatman, USA). Filters were washed twice with 250μl of Tris-HCl pH 7.4, 1OmM MnC12, and residual radioligand bound to the filters was mixed to lOOμl of liquid scintillation cocktail (Optiphase Supermix, Perkin Elmer, USA) and binding activity was determined by counting residual radioligand using a 1450 Micro-beta scintillation counter (Wallac, UK). Results of the binding assay are shown in Table 1.
Table 1
Figure imgf000084_0001
Figure imgf000085_0001
Figure imgf000086_0001
Figure imgf000087_0001
Example 52: Determination QfK1 (Radioligand binding assay)
Ki values were determined by equilibrium competition binding experiments against[3H]PGD2. Ki values were calculated from the formula below and represent the average of at least three independent dose response experiments. The Ki values give the ligand concentrations necessary to inhibit 50% of the binding of 3[H]PGD2 to CRTH2. K1= IC50/(l+[Concentration of Ligand]/Kd)]
All experiments were performed in 96 well plates, in a final volume of lOOμl according to the above described filtration assay. The concentration of membranes and 3[H]PGD2, as well as the positive and negative controls were identical to the conditions described above.
In one embodiment, the pyrazine sulfonamides of the present invention inhibit CRTH2 at a concentration of <100μM. In another embodiment, the pyrazine sulfonamides of the present invention inhibit CRTH2 at a concentration of <10μM. In a preferred embodiment, the pyrazine sulfonamides of the present invention inhibit CRTH2 at a concentration of <5μM. In a further preferred embodiment, the pyrazine sulfonamides of the present invention inhibit CRTH2 at a concentration of <1 μM.
Ki values are shown in Table 2. It can be derived that said compounds according to Formula I showed a significant inhibition of the binding of PGD2 to CRTH2.
Table 2
Figure imgf000089_0001
Example 53: [35SlGTPyS binding assay
The [35S]GTPγS assay measures the increase in guanine nucleotide exchange at G-proteins in cell membranes, resulting from agonist (PGD2) binding to CRTH2. This process can be monitored in vitro by incubating cell membranes containing G-proteins and CRTH2 with GDP and [35S]GTPγS, a radiolabeled, hydrolysis-resistant analogue of GTP (see, Harrison et al., Life Sciences 74, 489-508, 2003). The addition of a pyrazine sulfonamide results in binding to CRTH2 and thus in an inhibition of agonist binding, which can be monitered as inhibition of the stimulation of GTP/GDP exchange.
Assay conditions were identical to conditions of radioligand binding assay as described in Example 21. The [35S]GTPyS binding assay was performed at 300C with gentle agitation in 96-well scintillating white polystyrene plates (Perkin Elmer, USA), in a final volume of 200μl, containing 2% of dimethylsulphoxide (Me2SO). The 2,3 substituted pyrazine sulfonamides were incubated in 2OmM HEPES/KOH pH 7.4, 1OmM MgCl2, lOμg/ml Saponin, 3μM GDP, 15OmM NaCl containing lOμg of membranes expressing the hCRTH2 receptor (Euroscreen, Belgium) for 10 min. Non-specific binding was determined in the presence of lOμM of GTPγS. Samples were incubated for 30 min in the presence of increasing concentrations OfPGD2 for the determination of agonist activity, or with 8OnM OfPGD2 for determination of antagonist activity, respectively. 0.15nM of [35S]GTPyS were subsequently added to each sample and after incubation of 30min reactions were stopped by centrifugation at 1000 x g, at 4°C for 10 min. Supernatant was removed and [35S]GTPyS binding was determined using a 1450 Micro-beta scintillation counter. Data were analysed using "Prism" (GraphPad Software, Inc. San Diego, USA). The determination of the IC50 values (i.e. the amount necessary to achieve 50% inhibition of binding (in μM)) were performed in 96 well plates, in a final volume of lOOμl according to the above described filtration assay. The concentration of membranes and radioactive ligand, as well as the positive and negative controls were identical to the conditions used and described aboveExamples 21 and 22. The compound of Example 1 showed an IC50 value of 1.9 μM. The compound of Example 2 showed an IC50 value of 4.6 μM and the compound of Example 3 showed an IC50 value of l.4 μM.
Example 54: CHS model
The contact hypersensitivity model can be used to evaluate the therapeutic efficacy of 2, 3- substituted pyrazine sulfonamides on skin inflammation mediated by T cells. The model is well established for characterization of compound for dermatological indications like psoriasis and allergic contact dermatitis (Xu et al. J Exp Med. 183, 1001-12, 1996). It involves a sensitization phase and a subsequent challenge with an antigen (DNFB, 2,4- dinitrofluorbenzene). This results in skin inflammation with formation of edema and cellular infiltrates in the skin. The edema can be measured by caliper at the challenged site (ear of the mice). Intravenous administration of the compounds of the invention 30 min before challenge with DNFB results in a decrease of the swelling and therefore reduces inflammation in the skin compared to positive controls treated with vehicle only before challenge with the antigen. Negative control mice are not sensitized, but challenged with DNFB, therefore no T cell dependent inflammation occurs and no edema is formed. Balb/c mice are obtained from CharlesRiver (Calcco, Italy). Animals are housed in a conventional animal facility. Treatment starts at an average age of 8 - 12 weeks.
DNFB (2,4-dinitrofluorbenzene) is purchased from Sigma- Aldrich (StXouis, MO USA)
Sensitization and challenge of CHS by DNFB
Mice are sensitized and challenged to elicit CHS to DNFB. The sensitization phase is followed by a challenge phase. DNFB is diluted in acetone/olive oil (4/1) immediately before use. Mice are sensitized to DNFB by applying 25 μl of 0.5%DNFB solution onto the shaved dorsal skin. Five days later, 10 μl of 0.2% DNFB are applied onto both sides of the right ear (challenge). Ear thickness is monitored on day 6 (1 day after challenge) using a caliper (Mitutoyo, Milan, Italy). Ear swelling is calculated as ((Tn-T5)right ear - (Tn- T5)left ear), wherein Tn and T5 represent values of ear thickness at day n of investigation and day 5 prior to challenge, respectively.
REFERENCE LIST
Cosmi et al. (2000) Eur. J. Immunol. 30, 2972-2979
Bush, R.K., Georgitis J. W., Handbook of asthma and rhinitis. 1st ed. (1997), Abingdon: Blackwell Science. 270
Harrison et al.(2003) Life Sciences 74, 489-508
Hirai et al. (2001) J Exp. Med. 193, 255-261 Lewis et al. (1982) J. Immunol. 129, 1627
Matsuoka et al. (2000) Science 287, 2013-2017
Nagata et al. (1999) J. Immunol. 162, 1278-1286
Sawyer et al. (2002) Br. J. Pharmacol. 137, 1163-1172
Woodward et al. (1990) Invest. Ophthalomol Vis. Sci. 31, 138-146 Woodward et al. (1993) Eur. J. Pharmacol. 230, 327-333
Xu et al. (1996) J Exp Med. 183, 1001-12
WO 04/106302
WO 04/096777
WO 04/035543 WO 04/032848
WO 05/007094
WO 04/108692
WO 04/108717 WO 05/102338

Claims

1. A compound according to Formula (I),
Figure imgf000094_0001
as well as its geometrical isomers, its optically active forms as enantiomers, diastereomers and its racemate forms, and tautomers, as well as pharmaceutically acceptable salts and pharmaceutically active derivatives thereof, wherein
A is selected from the group consisting of
Figure imgf000094_0002
A5 A6 A7 A8
with n being an integer independently selected from 0, 1, 2, 3 or 4;
m is either 1 or 2; B is selected from the group consisting of C2-C6-alkynyl, C3-C8-cycloalkyl, C3-C8- heterocycloalkyl, aryl, and monocyclic heteroaryl;
R1 is either hydrogen or Ct-Cβ-alkyl;
R2 is selected from the group consisting of Ci-Cβ-alkyl, aryl, heteroaryl, C3-C8- cycloalkyl and C3-C8-heterocycloalkyl, wherein R2 is optionally substituted with one or more substituents selected from the group consisting of halogen, cyano, C1-C6- alkyl, d-Cό-alkoxy, thioalkoxy and thioalkyl;
R3 is selected from the group consisting of Ct-Cό-alkyl, aryl, heteroaryl, Ct-Cό-alkyl aryl, Ct-Cό-alkyl heteroaryl C3-C8-cycloalkyl and C3-C8-heterocycloalkyl wherein each of said Ct-Cβ-alkyl, aryl, heteroaryl, Ct-Cό-alkyl aryl, Ct-Cό-alkyl heteroaryl C3-
C8-cycloalkyl and C3-C8-heterocycloalkyl is optionally substituted with one or more substituents selected from the group consisting of halogen, cyano, Ct-Cό-alkyl, C1- C6-alkoxy, heteroaryl, aryl, thioalkoxy and thioalkyl, or wherein said aryl, heteroaryl, d-Ce-alkyl aryl, d-Cό-alkyl heteroaryl, C3-C8-cycloalkyl or C3-C8-heterocycloalkyl may be fused to one or more aryl, heteroaryl, C3-C8-cycloalkyl or C3-C8- heterocycloalkyl groups and may be substituted with one or more substituents selected of the group consisting of Ct-Cβ-alkyl, alkoxy, aryl, heteroaryl, carboxyl, cyano, halogen, hydroxy, amino, amino carbonyl, nitro, sulfoxy, sulfonyl, sulfonamide and trihaloalkyl;
R7 is selected from the group consisting of hydrogen, Ci-Cβ-alkyl, C2-C6-alkenyl, C2-
C6-alkynyl, aryl, heteroaryl, C3-C8-cycloalkyl, C3-C8-heterocycloalkyl, carboxyl, cyano, amino and hydroxy; and
R8 is selected from the group consisting of hydrogen, Ct-Cό-alkyl, aryl, and heteroaryl;
for use as a medicament.
2. The compound according to claim 1, wherein B is selected from the group consisting of aryl, C3-C8-heterocycloalkyl and C2-C6-alkynyl.
3. The compounds according to claim 1 or 2, wherein R2 is selected from the group consisting of an aryl, heteroaryl and Ci-Cβ-alkyl.
4. The compound according to any one of claims 1 to 3, wherein R1 is hydrogen.
5. The compound according to any one claims 1 to 4, wherein R2 and R3 are independently substituted with 1-3 substituents selected from Ct-Cβ-alkyl, alkoxy, cyano, amino or halogen, wherein said d-Co-alkyl or alkoxy may be substituted with halogen.
6. The compound according to any one of claims 1 to 5, wherein said compound is selected from the group of
N-{3-[4-(lH-indol-l-ylmethyl)phenyl]pyrazin-2-yl}-2-(trifluoromethyl)- benzenesulfonamide,
2-chloro-N-{3-[4-({methyl[4-(trifluoromethoxy)phenyl]amino}methyl)phenyl]- pyrazin-2-yl}benzenesulfonamide,
N-(3-{4-[(2-ethyl-lH-benzimidazol-l-yl)methyl]phenyl}pyrazin-2-yl)-2- (trifluoromethyl)benzenesulfonamide,
2-chloro-N-[3-(4-{[methyl(phenyl)amino]methyl}phenyl)pyrazin-2-yl]- benzenesulfonamide,
2-chloro-N-(3-{4-[(2-naphthyloxy)methyl]phenyl}pyrazin-2-yl)benzene- sulfonamide,
2-chloro-N-{3-[4-(lH-indol-l-ylmethyl)phenyl]pyrazin-2-yl}benzenesulfonamide, 2-chloro-N-(3-{4-[(5,6,
7,8-tetrahydronaphthalen-2-yloxy)methyl]phenyl}- pyrazin2-yl)benzenesulfonamide,
2-chloro-N-(3-{4-[(2-ethyl-lH-benzimidazol-l-yl)methyl]phenyl}pyrazin-2-yl)- benzenesulfonamide,
N-(3-{4-[(l ,3-benzodioxol-5-ylamino)methyl]phenyl}pyrazin-2-yl)-2-
(trifluoromethyl)benzenesulfonamide,
N-[3-(4-{[(3-methoxybenzyl)oxy]methyl}phenyl)pyrazin-2-yl]-2- (trifluoromethyl)benzenesulfonamide,
3-chloro-N-{3-[4-({methyl[4-(trifluoromethoxy)phenyl]amino}methyl)phenyl]- pyrazin-2-yl}benzenesulfonamide,
N-[3-(4-{[(4-chlorophenyl)(methyl)amino]methyl}phenyl)pyrazin-2-yl]thiophene-2- sulfonamide,
4-phenoxy-N- { 3-[4-(quinolin-2-ylmethyl)piperazin- 1 -yl]pyrazin-2-yl} - benzenesulfonamide,
4-methyl-N- { 3 -[4-( { methyl[4-(trifluoromethoxy)phenyl]amino } methyl)phenyl]- pyrazin-2-yl}benzenesulfonamide,
4-chloro-N-[3-(4-{[methyl(phenyl)amino]methyl}phenyl)pyrazin-2-yl]- benzenesulfonamide,
4-cyano-N- {3-[4-( {methyl[4-(trifluoromethoxy)phenyl]-amino} - methyl)phenyl]pyrazin-2-yl}benzenesulfonamide,
N-[3-(4-{[(4-Fluoro-phenyl)-methyl-amino]-methyl}-phenyl)-pyrazin-2-yl]-2- trifluoromethyl-benzenesulfonamide, N-(3-{4-[(Methyl-phenyl-amino)-methyl]-phenyl}-pyrazin-2-yl)-2-trifluoromethyl- benzenesulfonamide,
N-[3-(4-{[(4-Cyano-phenyl)-methyl-amino]-methyl}-phenyl)-pyrazin-2-yl]-2- trifluoromethyl-benzenesulfonamide,
N-{3-[4-(4-Fluoro-phenoxymethyl)-phenyl]-pyrazin-2-yl}-2-trifluoromethyl- benzenesulfonamide,
N-(3-{4-[(Ethyl-phenyl-amino)-methyl]-phenyl}-pyrazin-2-yl)-2-trifluoromethyl- benzenesulfonamide,
N-{3-[4-(2,3-Dihydro-benzo[l,4]oxazin-4-ylmethyl)-phenyl]-pyrazin-2- yl} -2-trifluoromethyl-benzenesulfonamide,
N-[3-(4-{[(3-Fluoro-phenyl)-methyl-amino]-methyl}-phenyl)-pyrazin-2-yl]-2- trifluoromethyl-benzenesulfonamide,
N-{3-[4-(6-Chloro-pyridin-3-yloxymethyl)-phenyl]-pyrazin-2-yl}-2-trifluoiOmethyl- benzenesulfonamide,
N-{3-[4-(2-Pyridin-2-yl-indol-l-ylmethyl)-phenyl]-pyrazin-2-yl}-2-trifluoromethyl- benzenesulfonamide,
N-{3-[4-(5-Fluoro-indol-l-ylmethyl)-phenyl]-pyrazin-2-yl}-2-trifluoromethyl- benzenesulfonamide,
N-[3-(4-Phenoxymethyl-phenyl)-pyrazin-2-yl]-2-trifluoromethyl- benzenesulfonamide,
N-[3-(4-{[(4-Chloro-phenyl)-methyl-amino]-methyl}-phenyl)-pyrazin-2-yl]-2- trifluoromethyl-benzenesulfonamide, 2-Chloro-N-[3-(4-{[(4-cyano-phenyl)-methyl-amino]-methyl}-phenyl)-pyrazin-2-yl]- benzenesulfonamide,
N-[3-(4-{[(3,4-Dichloro-phenyl)-methyl-amino]-methyl}-phenyl)-pyrazin-
2-yl]-2-trifluoromethyl-benzenesulfonamide,
N-{3-[4-(4-Cyano-phenoxymethyl)-phenyl]-pyrazin-2-yl}-2-trifluoromethyl- benzenesulfonamide,
N-{3-[4-(6-Fluoro-indol-l-ylmethyl)-phenyl]-pyrazin-2-yl}-2-trifluoromethyl- benzenesulfonamide,
2-Chloro-N-{3-[4-(5-methoxy-2-methyl-indol-l-ylmethyl)-phenyl]-pyrazin-2-yl}- benzenesulfonamide,
N-{3-[4-(4-Methoxy-phenoxymethyl)-phenyl]-pyrazin-2-yl}-2-trifluoromethyl- benzenesulfonamide,
N-(3-{4-[(Benzyl-pyridin-2-yl-amino)-methyl]-phenyl}-pyrazin-2-yl)-2-chloiO- benzenesulfonamide,
N-{3-[4-(2,3-Dihydro-indol-l-ylmethyl)-phenyl]-pyrazin-2-yl}-2-trifluoromethyl- benzenesulfonamide,
N-[3-(4-{[(2,4-Dichloro-phenyl)-methyl-amino]-methyl}-phenyl)-pyrazin-2-yl]-2- trifluoromethyl-benzenesulfonamide,
N-{3-[4-(3-Chloro-phenoxymethyl)-phenyl]-pyrazin-2-yl}-2-trifluoromethyl- benzenesulfonamide,
2-Chloro-N-[3-(4-{[(2,4-difluoro-phenyl)-methyl-amino]-methyl}-phenyl)-pyrazin-2- yl]-benzenesulfonamide, N-{3-[4-(2-Methyl-indol-l-ylmethyl)-phenyl]-pyrazin-2-yl}-2-trifluoiOmethyl- benzenesulfonamide,
2-Chloro-N-{3-[4-(5-fluoro-indol-l-ylmethyl)-phenyl]-pyrazin-2-yl}- benzenesulfonamide,
2-Chloro-N-[3-(4-{[(2-fluoro-phenyl)-methyl-amino]-methyl}-phenyl)-pyrazin-2-yl]- benzenesulfonamide,
2-Chloro-N-{3-[4-(2-methyl-indol-l-ylmethyl)-phenyl]-pyrazin-2-yl}- benzenesulfonamide,
N-(3- {4-[(Benzyl-pyridin-2-yl-amino)-methyl]-phenyl} -pyrazin-2-yl)-2- trifluoromethyl-benzenesulfonamide,
2-Chloro-N-(3-{4-[(ethyl-pyridin-2-yl-amino)-methyl]-phenyl}-pyrazin-2-yl)- benzenesulfonamide, and
N- { 3-[4-(5-Chloro-2-methyl-indol- 1 -ylmethyl)-phenyl]-pyrazin-2-yl} -2- trifluoromethyl-benzenesulfonamide.
Use ofa compound according to Formula (I) :
Figure imgf000100_0001
wherein A is selected from the group consisting of
Figure imgf000101_0001
O 1^ R
B^(CH2)n→ RJ B - U -R3 B- °-N4VR3 B4UW
A5 A6 A7 A8
with n being an integer selected from O, 1, 2, 3 or 4;
m is either 1 or 2;
B is selected from the group consisting of C2-C6-alkynyl, C3-C8-cycloalkyl, C3-C8- heterocycloalkyl, aryl, and monocyclic heteroaryl;
R1 is either hydrogen or Ci-Cβ-alkyl;
R2 is selected from the group consisting of Ct-Cβ-alkyl, aryl, heteroaryl, C3-C8- cycloalkyl and C3-C8-heterocycloalkyl, wherein R2 is optionally substituted with one or more substituents selected from the group consisting of halogen, cyano, C1-C6- alkyl, CrCό-alkoxy, thioalkoxy and thioalkyl;
R3 is selected from the group consisting of Ct-Cό-alkyl, aryl, heteroaryl, Ct-Cό-alkyl aryl, Ct-Cό-alkyl heteroaryl C3-C8-cycloalkyl and C3-C8-heterocycloalkyl wherein each of said Ct-Cβ-alkyl, aryl, heteroaryl, Ct-Cό-alkyl aryl, Ct-Cό-alkyl heteroaryl C3- C8-cycloalkyl and C3-C8-heterocycloalkyl is optionally substituted with one or more substituents selected from the group consisting of halogen, cyano, Ct-Cβ-alkyl, C1-
C6-alkoxy, heteroaryl, aryl, thioalkoxy and thioalkyl, or wherein said aryl, heteroaryl, Ct-Cό-alkyl aryl, Ct-Cό-alkyl heteroaryl, C3-C8-cycloalkyl or C3-C8-heterocycloalkyl may be fused to one or more aryl, heteroaryl, C3-C8-cycloalkyl or C3-C8- heterocycloalkyl groups and may be substituted with one or more substituents selected of the group consisting of Ct-Cβ-alkyl, alkoxy, aryl, heteroaryl, carboxyl, cyano, halogen, hydroxy, amino, amino carbonyl, nitro, sulfoxy, sulfonyl, sulfonamide and trihaloalkyl;
R7 is selected from the group consisting of Ci-Cβ-alkyl, C2-C6-alkenyl, C2-C6- alkynyl, aryl, heteroaryl, C3-C8-cycloalkyl, C3-C8-heterocycloalkyl, carboxyl, cyano, amino and hydroxy; and
R8 is selected from the group consisting of hydrogen, Ct-Cβ-alkyl, aryl, and heteroaryl;
as well as geometrical isomers, enantiomers, diastereomers, racemate forms, tautomers and pharmaceutically acceptable salts of said compounds for the preparation of a medicament for the treatment and/or prevention of allergic disease, inflammatory dermatoses, immunologocal disorders and neurodegenerative disorders.
8. The use according to claim 7, wherein said allergic disease is selected from the group consisting of allergic asthma, allergic rhinitis, allergic conjunctivitis, systemic anaphylaxis or hypersensitivity responses.
9. The use according to claim 7, wherein said inflammatory dermatosis is selected from the group consisting of of atopic dermatitis, eczema, allergic contact dermatitis, and urticaria and myositis.
10. The use according to claim 7, wherein said disease is selected from the group consisting of rheumatoid arthritis, multiple, sclerosis, osteoarthritis, and inflammatory bowel disease (IBD).
11. The use according to claim 7, wherein said disease is neuropatic pain.
12. The use according to any one of claims 7 to 11, wherein said compound is a modulator, in particular an inhibitor, of the CRTH2 activity.
13. The use according to claims 7 to 12 wherein said compound is selected from the group consisting of
N-{3-[4-(lH-indol-l -ylmethyl)phenyl]pyrazin-2-yl} -2-(trifluoromethyl)- benzenesulfonamide,
2-chloro-N-{3-[4-({methyl[4-(trifluoromethoxy)phenyl]amino}methyl)phenyl]- pyrazin-2-yl}benzenesulfonamide,
N-(3-{4-[(2-ethyl-lH-benzimidazol-l-yl)methyl]phenyl}pyrazin-2-yl)-2- (trifluoromethyl)benzenesulfonamide,
2-chloro-N-[3-(4-{[methyl(phenyl)amino]methyl}phenyl)pyrazin-2-yl]- benzenesulfonamide,
2-chloro-N-(3-{4-[(2-naphthyloxy)methyl]phenyl}pyrazin-2-yl)benzene- sulfonamide,
2-chloro-N-{3-[4-(lH-indol-l-ylmethyl)phenyl]pyrazin-2-yl}benzenesulfonamide,
2-chloro-N-(3-{4-[(5,6,7,8-tetrahydronaphthalen-2-yloxy)methyl]phenyl}-pyrazin-2- yl)benzenesulfonamide,
2-chloro-N-(3-{4-[(2-ethyl-lH-benzimidazol-l-yl)methyl]phenyl}pyrazin-2-yl)- benzenesulfonamide,
N-(3-{4-[(l,3-benzodioxol-5-ylamino)methyl]phenyl}pyrazin-2-yl)-2-
(trifluoromethyl)benzenesulfonamide, N-[3-(4-{[(3-methoxybenzyl)oxy]methyl}phenyl)pyrazin-2-yl]-2- (trifluoromethyl)benzenesulfonamide,
3-chloro-N-{3-[4-({methyl[4-(trifluoromethoxy)phenyl]amino}methyl)phenyl]- pyrazin-2-yl}benzenesulfonamide,
N-[3-(4-{[(4-chlorophenyl)(methyl)amino]methyl}phenyl)pyrazin-2-yl]thiophene-2- sulfonamide,
4-phenoxy-N- { 3-[4-(quinolin-2-ylmethyl)piperazin- 1 -yl]pyrazin-2-yl} - benzenesulfonamide,
4-methyl-N- { 3 -[4-( { methyl[4-(trifluoromethoxy)phenyl]amino } methyl)phenyl]- pyrazin-2-yl}benzenesulfonamide,
4-chloro-N-[3-(4-{[methyl(phenyl)amino]methyl}phenyl)pyrazin-2-yl]- benzenesulfonamide,
4-cyano-N-{3-[4-({methyl[4-(trifluoromethoxy)phenyl]amino}methyl)phenyl]- pyrazin-2-yl}benzenesulfonamide,
N-[3-(4-{[(4-Fluoro-phenyl)-methyl-amino]-methyl}-phenyl)-pyrazin-2-yl]-2- trifluoromethyl-benzenesulfonamide,
N-(3-{4-[(Methyl-phenyl-amino)-methyl]-phenyl}-pyrazin-2-yl)-2-trifluoromethyl- benzenesulfonamide,
N-[3-(4-{[(4-Cyano-phenyl)-methyl-amino]-methyl}-phenyl)-pyrazin-2-yl]-2- trifluoromethyl-benzenesulfonamide,
N-{3-[4-(4-Fluoro-phenoxymethyl)-phenyl]-pyrazin-2-yl}-2-trifluoromethyl- benzenesulfonamide, N-(3-{4-[(Ethyl-phenyl-amino)-methyl]-phenyl}-pyrazin-2-yl)-2-trifluoromethyl- benzenesulfonamide,
N-{3-[4-(2,3-Dihydro-benzo[l,4]oxazin-4-ylmethyl)-phenyl]-pyrazin-2- yl}-2-trifluoromethyl-benzenesulfonamide,
N-[3-(4-{[(3-Fluoro-phenyl)-methyl-amino]-methyl}-phenyl)-pyrazin-2-yl]-2- trifluoromethyl-benzenesulfonamide,
N-IS-^^ό-CUoro-pyridin-S-yloxymethy^-phenylJ-pyrazin^-yll^-trifluoiOmethyl- benzenesulfonamide,
N-{3-[4-(2-Pyridin-2-yl-indol-l-ylmethyl)-phenyl]-pyrazin-2-yl}-2-trifluoromethyl- benzenesulfonamide,
N-{3-[4-(5-Fluoro-indol-l-ylmethyl)-phenyl]-pyrazin-2-yl}-2-trifluoromethyl- benzenesulfonamide,
N-[3-(4-Phenoxymethyl-phenyl)-pyrazin-2-yl]-2-trifluoromethyl- benzenesulfonamide,
N-[3-(4-{[(4-Chloro-phenyl)-methyl-amino]-methyl}-phenyl)-pyrazin-2-yl]-2- trifluoromethyl-benzenesulfonamide,
2-Chloro-N-[3-(4-{[(4-cyano-phenyl)-methyl-amino]-methyl}-phenyl)-pyrazin-2-yl]- benzenesulfonamide,
N-[3-(4-{[(3,4-Dichloro-phenyl)-methyl-amino]-methyl}-phenyl)-pyrazin-2-yl]-2- trifluoromethyl-benzenesulfonamide,
N-{3-[4-(4-Cyano-phenoxymethyl)-phenyl]-pyrazin-2-yl}-2-trifluoromethyl- benzenesulfonamide, N-{3-[4-(6-Fluoro-indol-l-ylmethyl)-phenyl]-pyrazin-2-yl}-2-trifluoromethyl- benzenesulfonamide,
2-Chloro-N-{3-[4-(5-methoxy-2-methyl-indol-l-ylmethyl)-phenyl]-pyrazin-2-yl}- benzenesulfonamide,
N-{3-[4-(4-Methoxy-phenoxymethyl)-phenyl]-pyrazin-2-yl}-2-trifluoromethyl- benzenesulfonamide,
N-(3-{4-[(Benzyl-pyridin-2-yl-amino)-methyl]-phenyl}-pyrazin-2-yl)-2-chloiO- benzenesulfonamide,
N-{3-[4-(2,3-Dihydro-indol-l-ylmethyl)-phenyl]-pyrazin-2-yl}-2-trifluoromethyl- benzenesulfonamide,
N-[3-(4-{[(2,4-Dichloro-phenyl)-methyl-amino]-methyl}-phenyl)-pyrazin-2-yl]-2- trifluoromethyl-benzenesulfonamide,
N-{3-[4-(3-Chloro-phenoxymethyl)-phenyl]-pyrazin-2-yl}-2-trifluoromethyl- benzenesulfonamide,
2-Chloro-N-[3-(4-{[(2,4-difluoro-phenyl)-methyl-amino]-methyl}-phenyl)-pyrazin-2- yl]-benzenesulfonamide,
N-{3-[4-(2-Methyl-indol-l-ylmethyl)-phenyl]-pyrazin-2-yl}-2-trifluoiOmethyl- benzenesulfonamide,
2-Chloro-N-{3-[4-(5-fluoro-indol-l-ylmethyl)-phenyl]-pyrazin-2-yl}- benzenesulfonamide,
2-Chloro-N-[3-(4-{[(2-fluoro-phenyl)-methyl-amino]-methyl}-phenyl)-pyrazin-2-yl]- benzenesulfonamide, 2-Chloro-N-{3-[4-(2-methyl-indol-l-ylmethyl)-phenyl]-pyrazin-2-yl}- benzenesulfonamide,
N-(3- {4-[(Benzyl-pyridin-2-yl-amino)-methyl]-phenyl} -pyrazin-2-yl)-2- trifluoromethyl-benzenesulfonamide,
2-Chloro-N-(3- {4-[(ethyl-pyridin-2-yl-amino)-methyl]-phenyl} -pyrazin-2-yl)- benzenesulfonamide, and
N- { 3-[4-(5-Chloro-2-methyl-indol- 1 -ylmethyl)-phenyl]-pyrazin-2-yl} -2- trifluoromethyl-benzenesulfonamide.
14. A 2,3 substituted pyrazine sulfonamide selected from the group consisting of
N-{3-[4-(lH-indol-l-ylmethyl)phenyl]pyrazin-2-yl}-2-(trifluoromethyl)- benzenesulfonamide,
2-chloro-N-{3-[4-({methyl[4-(trifluoromethoxy)phenyl]amino}methyl)phenyl]- pyrazin-2-yl}benzenesulfonamide,
N-(3-{4-[(2-ethyl-lH-benzimidazol-l-yl)methyl]phenyl}pyrazin-2-yl)-2- (trifluoromethyl)benzenesulfonamide,
2-chloro-N-[3-(4-{[methyl(phenyl)amino]methyl}phenyl)pyrazin-2-yl]- benzenesulfonamide,
2-chloro-N-(3-{4-[(2-naphthyloxy)methyl]phenyl}pyrazin-2-yl)benzene- sulfonamide,
2-chloro-N-{3-[4-(lH-indol-l-ylmethyl)phenyl]pyrazin-2-yl}benzenesulfonamide,
2-chloro-N-(3-{4-[(5,6,7,8-tetrahydronaphthalen-2-yloxy)methyl]phenyl}-pyrazin2- yl)benzenesulfonamide, 2-chloro-N-(3-{4-[(2-ethyl-lH-benzimidazol-l-yl)methyl]phenyl}pyrazin-2-yl)- benzenesulfonamide,
N-(3-{4-[(l,3-benzodioxol-5-ylamino)methyl]phenyl}pyrazin-2-yl)-2- (trifluoromethyl)benzenesulfonamide,
N-[3-(4-{ [(3-methoxybenzyl)oxy]methyl}phenyl)pyrazin-2-yl]-2-
(trifluoromethyl)benzenesulfonamide,
3-chloro-N-{3-[4-({methyl[4-(trifluoromethoxy)phenyl]amino}methyl)phenyl]- pyrazin-2-yl}benzenesulfonamide,
N-[3-(4-{[(4-chlorophenyl)(methyl)amino]methyl}phenyl)pyrazin-2-yl]thiophene-2- sulfonamide,
4-phenoxy-N- { 3-[4-(quinolin-2-ylmethyl)piperazin- 1 -yl]pyrazin-2-yl} - benzenesulfonamide,
4-methyl-N- { 3 -[4-( { methyl[4-(trifluoromethoxy)phenyl]amino } methyl)phenyl]- pyrazin-2-yl}benzenesulfonamide,
4-chloro-N-[3-(4-{[methyl(phenyl)amino]methyl}phenyl)pyrazin-2-yl]- benzenesulfonamide,
4-cyano-N- {3-[4-( {methyl[4-(trifluoromethoxy)phenyl]-amino} - methyl)phenyl]pyrazin-2-yl}benzenesulfonamide,
N-[3-(4-{[(4-Fluoro-phenyl)-methyl-amino]-methyl}-phenyl)-pyrazin-2-yl]-2- trifluoromethyl-benzenesulfonamide,
N-(3-{4-[(Methyl-phenyl-amino)-methyl]-phenyl}-pyrazin-2-yl)-2-trifluoromethyl- benzenesulfonamide, N-[3-(4-{[(4-Cyano-phenyl)-methyl-amino]-methyl}-phenyl)-pyrazin-2-yl]-2- trifluoromethyl-benzenesulfonamide,
N-{3-[4-(4-Fluoro-phenoxymethyl)-phenyl]-pyrazin-2-yl}-2-trifluoromethyl- benzenesulfonamide,
N-(3- {4-[(Ethyl-phenyl-amino)-methyl]-phenyl} -pyrazin-2-yl)-2-trifluoromethyl- benzenesulfonamide,
N-{3-[4-(2,3-Dihydro-benzo[l,4]oxazin-4-ylmethyl)-phenyl]-pyrazin-2- yl}-2-trifluoromethyl-benzenesulfonamide,
N-[3-(4-{[(3-Fluoro-phenyl)-methyl-amino]-methyl}-phenyl)-pyrazin-2-yl]-2- trifluoromethyl-benzenesulfonamide,
N-{3-[4-(6-CUoro-pyridin-3-yloxymethyl)-phenyl]-pyrazin-2-yl}-2-trifluoiOmethyl- benzenesulfonamide,
N-{3-[4-(2-Pyridin-2-yl-indol-l-ylmethyl)-phenyl]-pyrazin-2-yl}-2-trifluoromethyl- benzenesulfonamide,
N-{3-[4-(5-Fluoro-indol-l-ylmethyl)-phenyl]-pyrazin-2-yl}-2-trifluoromethyl- benzenesulfonamide,
N-[3-(4-Phenoxymethyl-phenyl)-pyrazin-2-yl]-2-trifluoromethyl- benzenesulfonamide,
N-[3-(4-{[(4-Chloro-phenyl)-methyl-amino]-methyl}-phenyl)-pyrazin-2-yl]-2- trifluoromethyl-benzenesulfonamide,
2-Chloro-N-[3-(4-{[(4-cyano-phenyl)-methyl-amino]-methyl}-phenyl)-pyrazin-2-yl]- benzenesulfonamide, N-[3-(4-{[(3,4-Dichloro-phenyl)-methyl-amino]-methyl}-phenyl)-pyrazin-2-yl]-2- trifluoromethyl-benzenesulfonamide,
N-{3-[4-(4-Cyano-phenoxymethyl)-phenyl]-pyrazin-2-yl}-2-trifluoromethyl- benzenesulfonamide,
N-{3-[4-(6-Fluoro-indol-l-ylmethyl)-phenyl]-pyrazin-2-yl}-2-trifluoromethyl- benzenesulfonamide,
2-Chloro-N-{3-[4-(5-methoxy-2-methyl-indol-l-ylmethyl)-phenyl]-pyrazin-2-yl}- benzenesulfonamide,
N-{3-[4-(4-Methoxy-phenoxymethyl)-phenyl]-pyrazin-2-yl}-2-trifluoromethyl- benzenesulfonamide,
N-(3-{4-[(Benzyl-pyridin-2-yl-amino)-methyl]-phenyl}-pyrazin-2-yl)-2-chloiO- benzenesulfonamide,
N-{3-[4-(2,3-Dihydro-indol-l-ylmethyl)-phenyl]-pyrazin-2-yl}-2-trifluoromethyl- benzenesulfonamide,
N-[3-(4-{[(2,4-Dichloro-phenyl)-methyl-amino]-methyl}-phenyl)-pyrazin-2-yl]-2- trifluoromethyl-benzenesulfonamide,
N-{3-[4-(3-Chloro-phenoxymethyl)-phenyl]-pyrazin-2-yl}-2-trifluoromethyl- benzenesulfonamide,
2-Chloro-N-[3-(4-{[(2,4-difluoro-phenyl)-methyl-amino]-methyl}-phenyl)-pyrazin-2- yl]-benzenesulfonamide,
N-{3-[4-(2-Methyl-indol-l-ylmethyl)-phenyl]-pyrazin-2-yl}-2-trifluoiOmethyl- benzenesulfonamide, 2-Chloro-N-{3-[4-(5-fluoro-indol-l-ylmethyl)-phenyl]-pyrazin-2-yl}- benzenesulfonamide,
2-Chloro-N-[3-(4-{[(2-fluoro-phenyl)-methyl-amino]-methyl}-phenyl)-pyrazin-2-yl]- benzenesulfonamide,
2-Chloro-N-{3-[4-(2-methyl-indol-l-ylmethyl)-phenyl]-pyrazin-2-yl}- benzenesulfonamide,
N-(3- {4-[(Benzyl-pyridin-2-yl-amino)-methyl]-phenyl} -pyrazin-2-yl)-2- trifluoromethyl-benzenesulfonamide,
2-Chloro-N-(3-{4-[(ethyl-pyridin-2-yl-amino)-methyl]-phenyl}-pyrazin-2-yl)- benzenesulfonamide, and
N- { 3-[4-(5-Chloro-2-methyl-indol- 1 -ylmethyl)-phenyl]-pyrazin-2-yl} -2- trifluoromethyl-benzenesulfonamide.
15. A pharmaceutical composition containing at least one compound according to claim 14 and a pharmaceutically acceptable carrier, diluent or excipient thereof.
16. Process for the preparation of a compound according to claim 14, wherein one of the following reactions is performed:
Figure imgf000112_0001
VII Ib
Figure imgf000112_0002
IX Ic
Figure imgf000112_0003
Xl Id
wherein R4, R5, R6 are independently selected from the group of hydrogen, alkyl, aryl, heteroaryl, C3-Cs-cycloalkyl and C3-C8-heterocycloalkyl or iused rings of said aryl, heteroaryl, cycloalkyl or heterocycloalkyl.
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