Definitions

• the present invention relates to 2-sulfanyl-benzoimidazol-l-yl-acetic acid derivatives and their use as potent "chemoattractant receptor-homologous molecule expressed on Th2 cells" (hereinafter called CRTH2) antagonists in the treatment of prostaglandin mediated diseases, to pharmaceutical compositions containing these derivatives and to processes for their preparation.
• CRTH2 chemoattractant receptor-homologous molecule expressed on Th2 cells
• such derivatives may be used in pharmaceutical compositions for the treatment of both chronic and acute allergic/immune disorders comprising allergic asthma, rhinitis, chronic obstructive pulmonary disease (COPD), dermatitis, inflammatory bowel disease, rheumatoid arthritis, allergic nephritis, conjunctivitis, atopic dermatitis, bronchial asthma, food allergy, systemic mast cell disorders, anaphylactic shock, urticaria, eczema, itching, inflammation, ischemia-reperfusion injury, cerebrovascular disorders, pleuritis, ulcerative colitis, eosinophil-related diseases, such as Churg-Strauss syndrome and sinusitis, basophil-related diseases, such as basophilic leukemia and basophilic leukocytosis in humans and other mammals.
• COPD chronic obstructive pulmonary disease
• Prostaglandin D2 is a known agonist of the thromboxane A2 (TxA2) receptor, the PGD2 (DP) receptor and the recently identified G-protein-coupled "chemoattractant receptor-homologous molecule expressed on Th2 cells" (CRTH2).
• cytokines interleukin-4, IL-13, and IL-5
• IgE immunoglobulin E synthesis
• mast cell growth and differentiation upregulation of CD23 expression
• IgE immunoglobulin E synthesis
• CD23 upregulation of CD23 expression
• the stimulated release of the array of mediators causes end-organ damage, including constriction and hyperresponsiveness, vascular permeability, edema, mucous secretion, and further inflammation.
• CRTH2 is preferentially expressed on Th2 cells and is a chemoattractant receptor for PGD2 that mediates PGD2-dependent migration of blood Th2 cells.
• Chemoattractants are responsible for the recruitment of both Th2 cells and other effector cells of allergic inflammation and may provide the conceptual basis for the development of new therapeutic strategies, especially in allergic conditions.
• (2-fert.-butoxycarbonyl-l, 2, 3, 4- tetrahydro-pyrido[4,3-b]indol-5-yl)-acetic acid and (2-ethoxycarbonyl-l, 2, 3, 4- tetrahydro-pyrido[4,3-b]indol-5-yl)-acetic acid are disclosed by Kyle F. et al. in two patent specifications i.e. in US 5,817,756 and WO 95/07294, respectively.
• the present invention relates to the use of 2-sulfanyl-benzoimidazol-l-yl-acetic acids of the general Formula I
• R 1 , R 2 , R 3 and R 4 each independently represent hydrogen; alkyl; haloalkyl; halogen; nitro; cyano; formyl; methylsulfonyl; or methylcarbonyl; n is 0 or an integer from 1 to 10; r is 0 or the integer I 5 preferably 0;
• R 5 , R 6 and R 7 each independently represent hydrogen; alkyl; alkenyl; cycloalkyl; aryl; aryloxy; alkylcarbonyl; cycloalkylcarbonyl; alkoxycarbonyl, arylcarbonyl; arylalkylcarbonyl; N-alkyl-N-aryl-carbamoyl; N-alkyl-N-arylalkyl-carbamoyl; N- arylalkyl-N-aryl-carbamoyl; heterocyclyl (especially furanyl, oxazolyl or pyridinyl, all substituted by alkoxycarbonyl and optionally an additional halogen); heterocyclyloxy
• R 7 together with the carbon atom to which they are attached form cycloalkyl or saturated heterocyclyl;
• R 8 represents hydrogen or R 9 ;
• R 9 independently from R 8 represents cycloalkyl; cycloalkylalkyl; aryl; cycloalkylarylalkyl; arylalkyl; (diaryl)-alkyl; alkylcarbonyl; alkenylcarbonyl; cycloalkylcarbonyl; cycloalkylalkylcarbonyl; alkoxycarbonyl; alkoxydicarbonyl; arylcarbonyl; arylalkylcarbonyl; arylalkenylcarbonyl; (diaryl)-alkylcarbonyl; cycloalkylarylalkylcarbonyl; heterocyclylcarbonyl, especially furanylcarbonyl or pyridinylcarbonyl; alkylcarbamoyl; arylcarbamoyl; arylalkylcarbamoyl; alkylsulfonyl; arylsulfonyl; arylalkylsul
• R 8 and R 9 together with the nitrogen atom to which they are attached, form a heterocyclyl group;
• R 11 is hydrogen or methyl, preferably hydrogen; and optically pure enantiomers, mixtures of enantiomers, racemates, optically pure diastereoisomers, mixtures of diastereoisomers, diastereoisomeric racemates, mixtures of diastereoisomeric racemates, meso forms, geometric isomers, and prodrugs of compounds in which a prodrug forming group is present, as well as solvates and pharmaceutically acceptable salts of such compounds, and morphological forms; for the manufacture of medicaments for the control of disorders responding to CRTH2 receptor antagonist treatment.
• the present invention also relates to the use of a compound of Formula I as defined above, wherein R 1 , R 2 , R 3 and R 4 each independently represent hydrogen, alkyl, haloalkyl, halogen, nitro, cyano or formyl; r is 0; and R 11 is hydrogen.
• the present invention relates to compounds of Formula I as defined above, with the exception of:
• a subgroup of novel compounds falling under Formula I are those wherein R 5 represents hydrogen;
• R 6 represents hydrogen; alkyl; or alkoxycarbonyl; and R 7 represents alkoxycarbonyl; N-alkyl-N-arylalkyl-carbamoyl; N-alkyl-N-aryl- carbamoyl; alkylcarbonyl; N-arylalkyl-N-aryl-carbamoyl; arylalkylcarbonyl; arylcarbonyl; cycloalkylcarbonyl; heterocyclylcarbonyl; heterocyclyloxy; an amino of Formula NR 8 R 9 ; aryl substituted with one or two of alkoxy, alkylcarbonyl, and alkoxycarbonyl and optionally an additional halogen; or heterocyclyl substituted with alkylcarbonyl, cycloalkylcarbonyl, alkoxycarbonyl, arylcarbonyl, arylalkylcarbonyl, (diaryl)alkyl carbonyl or heterocyclylcarbonyl and optionally
• R represents alkyl or alkoxycarbonyl and R represents aryl; or R 6 and R 7 together with the carbon atom to which they are attached form cycloalkyl or saturated heterocyclyl.
• the present invention especially relates to compounds of Formula I, wherein R 1 , R 2 , R 3 and R 4 each independently represent hydrogen; alkyl; haloalkyl; halogen; nitro; cyano; formyl; methylsulfonyl; or methylcarbonyl; n is 0 or an integer from 1 to 5; r is 0 or the integer 1 ; R 5 , R 6 and R 7 each independently represent hydrogen; alkyl; alkenyl; cycloalkyl, especially cyclohexyl; aryl, wherein aryl is especially phenyl, optionally mono- or di- substituted wherein the substitutents are independently selected from the group consisting of hydroxy-alkyl, alkoxy, alkoxyalkyl, alkoxycarbonyl, halo, alkylcarbonyl, phenyl, 2,3-dihydro-indole-l-carbonyl, alkylcarbamoyl, morpholine-4-
• R and R together with the nitrogen atom to which they are attached, form a heterocyclyl group, especially 1, 3 -dioxo-1, 3 -dihydro-isoindol-2-yl, 2,3-dihydro-l- ethyloxycarbonyl-3-oxo-indazol-2-yl, 1-oxo- 1,3 -dihydro-isoindol-2-yl, 2-oxo-2,3- dihydro-benzoimidazol- 1 -yl, 1 -oxo- 1 H-phthalazin-2-yl, 2,4-dioxo- 1 ,4-dihydro-2H- quinazolin-3-yl, or l,l,3-trioxo-l,3-dihydro-l ⁇ 6 -benzo[d]isothiazol-2-yl; and R 11 is hydrogen or methyl; with the exception of the following compounds: (2-octyl
• aryl groups (preferably phenyl or naphthyl, especially phenyl) present as R 5 -R 8 , especially R 5 -R 9 , alone or in combination, are preferably unsubstituted or mono- or di-substituted with substituents independently selected from lower alkyl; lower alkoxy; halogen; cyano; lower alkoxycarbonyl; lower alkylcarbonyl; aryl, especially phenyl; aryl-lower alkyl; cycloalkyl; and heterocyclyl, such as especially piperidinyl.
• aryl groups (preferably phenyl, naphthyl, 3-oxo-indan-5-yl, or 8-oxo-5,6,7,8-tetrahydro-naphthalen-2-yl, especially phenyl) present as R 5 -R 9 , alone or in combination, are preferably unsubstituted or mono- or di-substituted with substituents independently selected from lower alkyl; hydroxy-lower alkyl; lower alkoxy; lower alkoxy-lower alkyl; halogen; cyano; lower alkoxycarbonyl; lower alkylcarbonyl; aryl, especially phenyl; aryl-lower alkyl; cycloalkyl; 2,3-dihydro-indole- 1-carbonyl; lower alkylcarbamoyl; morpholine-4-carbonyl; aryl-lower alkylcarbamoyl, especially benzylcarbamoy
• the substitutents are independently selected from hydroxy-lower alkyl; lower alkoxy; lower alkoxy-lower alkyl; halogen; lower alkoxycarbonyl; lower alkylcarbonyl; phenyl; 2,3-dihydro-indole-l-carbonyl; lower alkylcarbamoyl; morpholine-4-carbonyl; benzylcarbamoyl; N,N-di-lower alkylcarbamoyl; N-lower alkyl-N-benzyl-carbamoyl; hydroxy-lower alkoxy; benzoyl; and piperidinyl.
• R 5 -R 7 together with the carbon atom, to which they are attached, form saturated heterocyclyl (preferably piperidinyl or pyrrolidinyl)
• this group may contain one nitrogen atom which is substituted with R 10 , wherein R 10 represents alkylcarbamoyl; alkylcarbonyl; alkoxycarbonyl; alkylsulfonyl; arylalkylcarbamoyl; arylalkylcarbonyl; arylalkoxycarbonyl; arylalkylsulfonyl; arylcarbamoyl; arylcarbonyl; aryloxycarbonyl; arylsulfonyl; cycloalkylcarbamoyl; cycloalkylcarbonyl; cycloalkyloxycarbonyl; cycloalkylsulfonyl; heterocyclylcarbamoyl; heterocyclylcarbamoyl; heterocyclylcar
• R 5 -R 7 together with the carbon atom, to which they are attached, form saturated heterocyclyl (preferably piperidinyl or pyrrolidinyl), this group may contain one nitrogen atom which is substituted with R 10 , wherein R 10 represents alkylcarbamoyl; alkylcarbonyl; alkoxycarbonyl; alkylsulfonyl; arylalkylcarbamoyl; arylalkylcarbonyl; arylalkoxycarbonyl; arylalkylsulfonyl; arylcarbamoyl; arylcarbonyl; (diaryl)-alkylcarbonyl; aryloxycarbonyl; arylsulfonyl; arylalkenylsulfonyl; cycloalkylcarbamoyl; cycloalkylalkylcarbonyl; cycloalkylcarbonyl; cycloalkylcarbonyl; cycl
• R 10 represents alkylcarbonyl; alkylsulfonyl; arylalkylcarbonyl, wherein aryl is especially phenyl; arylalkoxycarbonyl, wherein aryl is especially phenyl; arylalkylsulfonyl, wherein aryl is especially phenyl; arylcarbonyl, wherein aryl is especially phenyl substituted by alkoxy or halo or wherein aryl is naphthyl; (diaryl)-alkylcarbonyl, wherein aryl is especially phenyl; arylsulfonyl, wherein aryl is especially phenyl substituted by alkyl or alkoxy or wherein aryl is naphthyl; arylalkenylsulfonyl, wherein aryl is especially phenyl; cycloalkylalkylcarbonyl, wherein cycloalkyl is especially cyclopen
• substituents R 1 , R 2 , R 3 and R 4 each independently represent hydrogen; methyl; trifluoromethyl; fluoro, chloro, bromo; nitro; cyano; formyl; methylsulfonyl; or methylcarbonyl.
• substituents R 1 , R 2 , R 3 and R each independently represent hydrogen; methyl; trifluoromethyl; fluoro, chloro, bromo; nitro; cyano; or formyl.
• R -R are as above or as in Formula I.
• n in Formula I is 1 or 2; R 5 and R 6 each represent hydrogen; R 7 represents an amino of Formula NR R ;
• R represents hydrogen or R ;
• R 9 independently from R 8 represents cycloalkyl; cycloalkylalkyl; aryl; arylalkyl; (diaryl)-alkyl; alkylcarbonyl; cycloalkylcarbonyl; cycloalkylalkylcarbonyl; alkoxycarbonyl; alkoxydicarbonyl; arylcarbonyl; arylalkylcarbonyl; arylalkenylcarbonyl; (diaryl)-alkylcarbonyl; heterocyclylcarbonyl; alkylcarbamoyl; arylcarbamoyl; arylalkylcarbamoyl; alkylsulfonyl; arylsulfonyl; arylalkylsulfonyl, wherein aryl groups present as R 8 and/or R 9 , alone or in combination with other groups, preferably represent phenyl or naphthyl, especially phenyl, where
• n in Formula I is 2 or 3, especially 1 or 2;
• R 5 and R 6 each represent hydrogen;
• R 7 represents an amino of Formula NR 8 R 9 ;
• R 8 represents hydrogen
• R 9 represents cycloalkyl; aryl; arylalkyl; (diaryl)-alkyl; alkylcarbonyl; cycloalkyl- alkylcarbonyl; cycloalkylcarbonyl; alkenylcarbonyl; alkoxycarbonyl; alkoxydicarbonyl; arylcarbonyl; arylalkylcarbonyl; (diaryl)-alkylcarbonyl; heterocyclylcarbonyl; alkylcarbamoyl; arylcarbamoyl; arylalkylcarbamoyl; alkylsulfonyl; arylsulfonyl; arylalkylsulfonyl; or R 8 represents cycloalkyl; arylalkyl; aryl; alkoxycarbonyl; and R 9 represents cycloalkyl; cyclylalkyl-alkyl; aryl; arylalkyl
• R 8 represents hydrogen; and R 9 represents particularly 3-phenyl-acryloyl; butoxycarbonyl, fert-butoxycarbonyl; ethoxydicarbonyl; propylcarbamoyl; 2,2-dimethyl-propionyl; 3,3-dimethyl-butyryl, 3- octanoyl, pentanoyl; butane- 1-sulfonyl; 4-piperidin-l-yl-phenyl, phenyl; 2,2-diphenyl- ethyl, 3 -benzyl; 2-cyclohexyl-2-phenyl-acetyl, 3,3-diphenyl-propionyl, 3-phenyl- propionyl, diphenylacetyl, phenylacetyl; phenylmethanesulfonyl; phenylcarbamoyl; 4- bromo-benzoyl, 4-methoxy-benzoyl;
• R 9 represents particularly propylcarbamoyl; pentanoyl; butane-1-sulfonyl; 4-piperidin- l-yl-phenyl, phenyl; benzyl, phenethyl, 2,2-diphenyl-ethyl; benzylcarbamoyl; 2- cyclohexyl-2-phenyl-acetyl, 2-phenylacetyl, 3,3-diphenyl-propionyl, diphenylacetyl, phenylmethanesulfonyl; phenylcarbamoyl; benzenesulfonyl; cyclohexyl, cyclopropyl; or cyclohexylmethyl; or
• R 8 and R 9 together with the nitrogen atom to which they are attached, represent particularly l-oxo-lH-phthalazin-2-yl; l-oxo-l,3-dihydro-isoindol-2-yl; 2-oxo-2,3- dihydro-benzoimidazol-1-yl; l-ethoxycarbonyl-3-oxo-2,3-dihydro-indazole-2-yl; 2,4- dioxo-l,4-dihydro-2H-quinazolin-3-yl; or l,3-dioxo-l,3-dihydro-isoindol-2-yl; 1,1,3- trioxo-l,3-dihydro-l ⁇ 6 -benzo[d]isothiazol-2-yl.
• n in Formula I is 0;
• R 5 and R 6 each represent hydrogen; R 7 represents phenyl; furanyl, oxazolyl, pyridinyl or thiazolyl, all substituted with one or two of alkoxy, alkylcarbonyl, and alkoxycarbonyl and optionally an additional halogen.
• R 7 represents particularly halogen or alkoxy substituted
• R 7 represents 3-(methoxycarbonyl)phenyl; 2-bromo-3- (methoxycarbonyl)phenyl, 4-bromo-3-(methoxycarbonyl)phenyl, 5-bromo-3- (methoxycarbonyl)phenyl, 2-bromo-5-(methoxycarbonyl)phenyl, 2-methoxy-5- (methoxycarbonyl)phenyl; 3 -acetyl
• n in Formula I is 0; R 5 and R 6 each represent hydrogen; and R 7 represents phenyl, optionally mono- or di-substituted wherein the substitutents are independently selected from the group consisting of hydroxy-alkyl, alkoxy, alkoxyalkyl, alkoxycarbonyl, halo, alkylcarbonyl, phenyl, 2,3-dihydro-indole- 1-carbonyl, alkylcarbamoyl, morpholine-4-carbonyl, benzylcarbamoyl, N 5 N- dialkylcarbamoyl, N-alkyl-N-benzyl-carbamoyl, hydroxyalkoxy and benzoyl; or R 7 represents 3-oxo-indan-5-yl or 8-oxo-5,6,7,8-tetrahydro-naphthalen-2-yl, both substituted by alkoxy.
• n in Formula I is 1 ; R 5 represents hydrogen;
• R 6 and R 7 together with the carbon atom to which they are attached form a 5- or 6- membered nitrogen containing saturated heterocyclyl containing one nitrogen ring atom, wherein this nitrogen ring atom contains a substituent R 10 , wherein R 10 is as defined hereinabove; most preferred in this aspect, R 6 and R 7 form a piperidinyl, particularly a piperidin-3-yl ring; and
• R 10 represents particularly acetyl, butyryl, heptanoyl; 1-phenylacetyl, 3-phenyl- propionyl, diphenylacetyl; naphthalene- 1-carbonyl, 2-methoxy-benzoyl, 3-chloro- benzoyl, 4-bromo-benzoyl; 1-cyclohexanecarbonyl, 3-cyclopentyl-propionyl; or furan- 2-carbonyl, most preferred butyryl.
• Most preferred novel compounds of the present invention include: ⁇ 2-[3-(butoxycarbonyl-phenetliyl-amino)-propylsulfanyl]-5-nitro-benzoimidazol-l-yl ⁇ - acetic acid; rac [2-(3 - ⁇ (2-cyclohexyl-2-phenyl-acetyl)-[(4-ethyloxycarbonyl)-phenyl] -amino ⁇ - propylsulfanyl)-benzoimidazol-l-yl] -acetic acid; and
• the present invention also especially relates to a compound selected from:
• novel compounds of the present invention include:
• Preferred novel compounds of the present invention include: rac [2-(l-methyl-2-oxo-2-phenyl-ethylsulfanyl)-benzoimidazol-l-yl]-acetic acid;
• Particulary preferred novel compounds of the present invention include: rac ⁇ 2- [ 1 -(3 ,4-dichloro-benzenesulfonyl)-piperidin-3 -ylmethylsulfanyl]- benzoimidazol-l-yl ⁇ -acetic acid; rac ⁇ 2-[ 1 -(3 -phenyl-acryloyty-piperidin-S-ylmethylsulfanyl] -benzoimidazol- 1 -yl ⁇ - acetic acid;
• the present invention also relates to precursors of the general Formula II,
• R 1 -R 7 and n are as in Formula I and R represents an alkyl group, preferably ethyl or tert-butyl, are novel with the exception of:
• novel precursors also form part of the present invention. They include, e.g. : tert-butyl [2-(2-cyclohexyl-ethylsulfanyl)-benzoimidazol- 1 -yl]-acetic acetate; tert-butyl (2-hexylsulfanyl-benzoimidazol-l -yl)-acetate; tert-butyl (2-pentylsulfanyl-benzoimidazol-l-yl)-acetate; tert-butyl (2-but-3 -enylsulfanyl-benzoimidazol- 1 -yl)-acetate; tert-butyl (2-butylsulfanyl-benzoimidazol- 1 -yl)-acetate; rac tert-butyl [2-(l -phenyl -ethylsulfanyl)-benzoimidazol- 1
• R 1 -R 4 and R 11 are as defined for Formula I and R represents an alkyl group.
• Such novel intermdediates include: tert-butyl-(2-mercapto-benzoimidazol- 1 -yl)-acetate; tert-butyl-(2-mercapto-5 -nitro-benzoimidazol- 1 -yl)-acetate; tert-butyl-(2-mercapto-6-nitro-benzoimidazol- 1 -yl)-acetate; tert-butyl (5-formyl-2-mercapto-benzoimidazol- 1 -yl)-acetate; tert-butyl (5,6-difluoro-2-mercapto-benzoimidazol- 1 -yl)-acetate; tert-butyl (2-mercapto-5-methanesulfonyl-benzoimidazol-l-yl)-acetate; tert-butyl (5-acetyl-2-mercapto-benzoimidazol-l -yl
• any reference to a compound of Formula I is to be understood as referring also to optically pure enantiomers, mixtures of enantiomers, racemates, optically pure diastereoisomers, mixtures of diastereoisomers, diastereoisomeric racemates, mixtures of diastereoisomeric racemates, meso forms, geometric isomers, and prodrugs of compounds in which a prodrug forming group is present, as well as salts (especially pharmaceutically acceptable salts) and solvates (including hydrates) of such compounds, and morphological forms, as appropriate and expedient.
• alkyl refers to a saturated aliphatic group including a straight or branched hydrocarbon chain containing 1-8, preferably 1-4 carbon atoms.
• Representative examples of alkyl include, but are not limited to, methyl, ethyl, n-propyl, zso-propyl, ⁇ -butyl, tert-butyl, iso-butyl (or 2- methylpropyl), cyclopropylmethyl, ra-pentyl, zso-pentyl, wo-amyl, ⁇ -amyl, n-hexyl, n- heptyl, ⁇ -octyl and the like.
• the alkyl group can be optionally substituted with one or more substituents, each independently selected from alkenyl, alkoxy, alkoxycarbonyl, alkylcarbonyl, alkylcarbonyloxy, alkylendioxy, alkylsulfinyl, alkylsulfonyl, alkylthio, alkynyl, amino, aminocarbonyl, aryl, arylalkenyl, arylalkoxy, aryloxy, aryloxycarbonyl, arylsulfmyl, arylsulfonyl, arylthio, carboxy, cyano, formyl, halogen, haloalkoxy, heterocyclyl, hydroxy, mercapto, nitro, and the like, appended to any carbon atom of the alkyl moiety.
• R 9 is arylalkylcarbonyl
• the alkyl group of this radical can for example be substituted by cyclohexyl,
• lower alkyl refers to alkyl groups with 1-4 carbon atoms.
• Representative examples of lower alkyl include, but are not limited to, methyl, ethyl, ⁇ -propyl, wo-propyl, n-butyl, is ⁇ -butyl, t ⁇ r/-butyl and the like.
• alkenyl refers to a straight or branched hydrocarbon chain containing 2-8, preferably 2-4 carbon atoms with at least one carbon-carbon double bond.
• Representative examples of alkenyl include, but are not limited to, ethenyl, 2-propenyl, 2-methyl-2-propenyl, 3-butenyl, 4-pentenyl, 5- hexenyl and the like.
• alkylenedioxy refers to a -O(CH 2 ) n O- group, wherein n is preferably 1 or 2, and wherein the oxygen atoms are appended to two adjacent carbon atoms of the parent molecular moiety.
• Representative examples of alkylenedioxy include, but are not limited to, methylenedioxy, ethylenedioxy, and the like.
• alkynyl refers to a straight or branched hydrocarbon chain containing 2-8 carbon atoms with at least one-carbon- carbon triple bond.
• Representative examples of alkynyl include, but are not limited to, 1-propynyl, 2-propynyl, 1-butynyl, 3-butynyl, 2-pentynyl, and the like.
• alkoxy refers to an alkyl group appended to the parent molecular moiety through an oxygen bridge.
• Representative examples of alkoxy include, but are not limited to, methoxy, ethoxy, propoxy, 2- propoxy, butoxy, tert-butoxy, pentyloxy, hexyloxy, and the like.
• alkoxy alkyl refers to an alkoxy group appended to the parent molecular moiety through an alkyl group.
• Representative examples of alkoxyalkyl include, but are not limited to, tert- butoxymethyl, 2-ethoxyethyl, 2-methoxyethyl, methoxymethyl, and the like.
• alkoxycarbonyl refers to an alkoxy group appended to the parent molecular moiety through a carbonyl group.
• Representative examples of alkoxycarbonyl include, but are not limited to, methoxycarbonyl, ethoxycarbonyl, fert-butoxycarbonyl, and the like.
• alkoxycarbonylalkyl refers to an alkoxycarbonyl group appended to the parent molecular moiety through an alkyl group.
• alkoxycarbonylalkyl include, but are not limited to, methoxycarbonylpropyl, ethoxycarbonylbutyl, 2-fert-butoxycarbonylethyl, and the like.
• alkylcarbonyl or "acyl”, as used herein, alone or in any combination, refers to an alkyl group appended to the parent molecular moiety through a carbonyl group.
• Representative examples of alkylcarbonyl include, but are not limited to, acetyl, 1- oxopropyl, 2,2-dimethyl-l-oxopropyl, 1-o ⁇ obutyl, 1-oxopentyl, and the like.
• alkylcarbonylalkyl refers to an alkylcarbonyl group appended to the parent molecular moiety through an alkyl group.
• alkylcarbonylalkyl include, but are not limited to, 2- oxopropyl, 3,3-dimethyl-2-oxopropyl, 3-oxobutyl, 3-oxopentyl and the like.
• alkylcarbonyloxy refers to an alkylcarbonyl group appended to the parent molecular moiety through an oxygen bridge.
• Representative examples of alkylcarbonyloxy include, but are not limited to, acetyloxy, ethylcarbonyloxy, tert-butylcarbonyloxy and the like.
• alkylsulfinyl refers to an alkyl group appended to the parent molecular moiety through a sulfinyl group.
• alkylsulfinyl include, but are not limited to, methylsulfmyl, ethylsulfmyl and the like.
• alkylsulfinylalkyl refers to an alkylsulfinyl group appended to the parent molecular moiety through an alkyl group.
• Representative examples of alkylsulfinylalkyl include, but are not limited to, methylsulf ⁇ nylmethyl, ethylsulfmylmethyl and the like.
• alkylsulfonyl refers to an alkyl group appended to the parent molecular moiety through a sulfonyl group.
• Representative examples of alkylsulfonyl include, but are not limited to, methylsulfonyl, ethylsulfonyl, and the like.
• alkylsulfonylalkyl refers to an alkylsulfonyl group appended to the parent molecular moiety through an alkyl group.
• alkylsulfonylalkyl include, but are not limited to, methylsulfonylmethyl, ethylsulfonylmethyl and the like.
• alkylthio (synonym “alkylsulfanyl”), as used herein, alone or in any combination, refers to an alkyl group appended to the parent molecular moiety through an -S- bridge.
• alkylthio include, but are not limited to, methylthio, ethylthio, fert-butylthio, hexylthio and the like.
• alkylthioalkyl refers to an alkylthio group appended to the parent molecular moiety through an alkyl group.
• alkylthioalkyl include, but are not limited to, methylthiomethyl, 2-(ethylthio)ethyl, and the like.
• aminoalkyl refers to an amino group appended to the parent molecular moiety through an alkyl group.
• Representative examples of aminoalkyl include, but are not limited to, aminomethyl, 2-(amino)ethyl, and the like.
• aminocarbonyl or “carbamoyl”, as used herein, alone or in any combination, refers to an amino group appended to the parent molecular moiety through a carbonyl group.
• aminocarbonylalkyl refers to an aminocarbonyl group appended to the parent molecular moiety through an alkyl group.
• aryl refers to an carbocyclic group having at least one aromatic ring, e.g. phenyl or biphenyl, or multiple condensed ring systems, in which at least one ring is aromatic, e.g. 1,2,3,4-tetrahydronaphthyl, naphthyl, anthryl, phenanthryl, fluorenyl, and the like.
• aromatic e.g. 1,2,3,4-tetrahydronaphthyl, naphthyl, anthryl, phenanthryl, fluorenyl, and the like.
• the term preferably relates to phenyl or naphthyl, especially to phenyl.
• the aryl group may be optionally substituted with one or more functional groups individually and independently selected from alkenyl, alkoxy, alkoxyalkyl, alkoxycarbonyl, alkoxycarbonylalkyl, alkyl, cycloalkyl, alkylcarbonyl, alkylcarbonylalkyl, alkylcarbonyloxy, alkylendioxy, alkylsulfinyl, alkylsulfmylalkyl, alkylsulfonyl, alkylsulfonylalkyl, alkylthio, alkylthioalkyl, alkynyl, amino, aminoalkyl, aminocarbonyl, aminocarbonylalkyl, aryl, arylalkenyl, arylalkoxy, arylalkyl, aryloxy, aryloxycarbonyl, aryloxycarbonylalkyl, arylsulfmyl, arylsulfmylalkyl
• arylalkenyl refers to an aryl group appended to the parent molecular moiety through an alkenyl group.
• the aryl group may be unsubstituted or substituted.
• Representative examples of arylalkenyl include, but are not limited to, 2-phenylethenyl, 3-phenylpropen-2-yl, 2-naphth-2- ylethenyl, and the like.
• arylalkoxy refers to an aryl group appended to the parent molecular moiety through an alkoxy group.
• the aryl group may be unsubstituted or substituted.
• Representative examples of arylalkoxy include, but are not limited to, 2-phenylethoxy, 5-phenylpentyloxy, 3-naphth-2- ylpropoxy, and the like.
• arylalkyl refers to an aryl group appended to the parent molecular moiety through an alkyl group.
• the aryl group may be unsubstituted or substituted.
• Representative examples of arylalkyl include, but are not limited to, benzyl, 2-phenylethyl, 3-phenylpropyl, 2-naphth-2-ylethyl, and the like.
• aryloxy refers to an aryl group appended to the parent molecular moiety through an oxygen bridge.
• the aryl group can be unsubstituted or substituted.
• Representative examples of aryloxy include, but are not limited to, phenoxy, naphthyloxy, 3-bromophenoxy, 4-chlorophenoxy, A- methylphenoxy, 3,4-dimetho ⁇ yphenoxy, and the like.
• carbonyl as used herein, alone or in any combination, refers to a -C(O)- group.
• carboxyalkyl refers to a carboxy group appended to the parent molecular moiety through an alkyl group.
• Representative examples of carboxyalkyl include, but are not limited to, carboxymethyl, 2-carboxyethyl, 3-carboxypropyl, and the like.
• cyano refers to a -C ⁇ N group.
• cyanoalkyl refers to a cyano group appended to the parent molecular moiety through an alkyl group.
• Representative examples of cyanoalkyl include, but are not limited to, cyanomethyl, 2-cyanoethyl, 3- cyanopropyl, and the like.
• cycloalkyl refers to a saturated cyclic hydrocarbon moiety containing 3-15, preferably 3-6, carbon atoms, optionally (less preferred) substituted with one or more groups, each individually and independently selected from alkenyl, alkoxy, alkoxyalkyl, alkoxycarbonyl, alkoxycarbonylalkyl, alkyl, alkylcarbonyl, alkylcarbonylalkyl, alkylcarbonyloxy, alkylendioxy, alkylsulfmyl, alkylsulfmylalkyl, alkylsulfonyl, alkylsulfonylalkyl, alkylthio, alkylthioalkyl, alkynyl, amino, aminoalkyl, aminocarbonyl, aminocarbonylalkyl, aryl, arylalkenyl, arylalkoxy, arylalkyl, aryloxy, ary
• cycloalkyl include, but are not limited to, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, cyclooctyl and the like.
• one of the distal rings may be aromatic, e.g., 1-indanyl, 2-indanyl, tetrahydronaphthyl, bicyclo[4.2.0]octa-l,3,5-trien-7-yl, and the like.
• formylalkyl refers to a formyl group, appended to the parent molecular moiety through an alkyl group.
• formylalkyl include, but are not limited to, formylmethyl, 2-formylethyl, and the like.
• halo or halogen, as used herein, alone or in any combination, refers to fluorine, bromine, chlorine, and iodine.
• haloalkyl refers to an alkyl group having at least one hydrogen atom replaced with a halogen atom.
• Representative examples of haloalkyl include, but are not limited to, chloromethyl, 2-fluoroethyl, trifluoromethyl, pentafluoroethyl, 2-chloro-3-fluoropentyl, and the like.
• haloalkoxy refers to an alkoxy group having at least one hydrogen atom replaced with a halogen atom.
• Representative examples of haloalkoxy include, but are not limited to, chloromethoxy, 2-fluoroethoxy, trifluoromethoxy, pentafluoroethoxy, and the like.
• heterocyclyl refers to a monocyclic, bicyclic or polycyclic ring system containing up to 15 ring atoms, at least one of these, preferably 1 or 2, being a hetero atom independently selected from nitrogen, oxygen or sulfur.
• the ring system may be saturated, partially unsaturated, unsaturated or aromatic, mono- or bicyclic.
• heterocyclyl include, but are not limited to, furyl, imidazolyl, imidazolinyl, imidazolidinyl, isothiazolyl, isoxazolyl, morpholinyl, oxadiazolyl, oxazolyl, oxazolinyl, oxazolidinyl, piperazinyl, piperidinyl, pyranyl, pyrazinyl, pyrazolyl, pyridyl, pyrimidinyl, pyridazinyl, pyrrolyl, pyrrolinyl, pyrrolidinyl, tetrahydrofuranyl, tetrahydrofuranyl, tetrahydrothienyl, thiadiazolyl, thiazolyl, thiazolinyl, thiazolidinyl, thienyl, thiomorpholinyl, 1,1-dioxothiomorpholinyl, 1,
• heterocyclyl moieties may be optionally substituted with one or more groups, each individually and independently selected from alkenyl, alkoxy, alkoxyalkyl, alkoxycarbonyl, alkoxycarbonylalkyl, alkyl, alkylcarbonyl, alkylcarbonylalkyl, alkylcarbonyloxy, alkylendioxy, alkylsulfmyl, alkylsulfinylalkyl, alkylsulfonyl, alkylsulfonylalkyl, alkylthio, alkylthioalkyl, alkynyl, amino, aminoalkyl, aminocarbonyl, aminocarbonylalkyl, aryl, arylalkenyl, arylalkoxy, arylalkyl, aryloxy, arylcarbonyl, arylalkylcarbonyl, (diaryl)alkylcarbonyl, aryloxycarbonyl, aryl
• the substituents are selected from oxo, alkoxycarbonyl, alkylcarbonyl, alkylsulfonyl, arylalkylcarbonyl, arylalkoxycarbonyl, arylalkylsulfonyl, arylcarbonyl, (diaryl)-alkylcarbonyl, arylsulfonyl, arylalkenylsulfonyl, cycloalkylalkylcarbonyl, cycloalkylcarbonyl, heterocyclylcarbonyl, and heterocyclylsulfonyl.
• saturated heterocyclyl is another special case of “heterocyclyl” and refers to saturated rings as defined above for “heterocyclyl”, especially to piperidinyl and pyrrolidinyl.
• heterocyclylalkenyl refers to a heterocyclyl group appended to the parent molecular moiety through an alkenyl group.
• Representative examples of heterocyclylalkenyl include, but are not limited to, 2-pyrid- 3-ylethenyl, 3-quinolin-3-ylpropen-2-yl, 5-pyrid-4-ylpenten-4-yl, and the like.
• heterocyclylalkoxy refers to a heterocyclyl group appended to the parent molecular moiety through an alkoxy group.
• Representative examples of heterocyclylalkoxy include, but are not limited to, 2-pyrid- 3-ylethoxy, 3-quinolin-3-ylpropoxy, 5-pyrid-4-ylpentyloxy, and the like.
• heterocyclylalkyl refers to a heterocyclyl group appended to the parent molecular moiety through an alkyl group.
• Representative examples of heterocyclylalkyl include, but are not limited to, 2-pyrid-3- ylmethyl, 2-pyrimidin-2-ylpropyl, and the like.
• heterocyclyloxy refers to a heterocyclyl group appended to the parent molecular moiety through an oxy group.
• Representative examples of heterocyclyloxy include, but are not limited to, pyrid-3- yloxy, quinolin-3-yloxy, and the like, especially (l-ethyloxycarbonyl-indazol-3-yl)- oxy.
• hydroxy or "hydroxyl” as used herein, alone or in any combination, refers to an -OH group
• hydroxyalkyl refers to an alkyl group having at least one hydrogen atom replaced with a hydroxy group.
• Representative examples of hydroxyalkyl include, but are not limited to, hydroxymethyl, 2-hydroxyethyl, 3-hydroxypropyl, 2-ethyl-4-hydroxyheptyl, and the like.
• nitro refers to a -NO 2 group.
• oxy refers to an -O- group.
• compounds of Formula I or pharmaceutically acceptable salts thereof are included that may exist in, and be isolated in, isomeric forms, including cis- or trans isomers or mixtures thereof, and tautomers.
• Other compounds of this invention may contain one or more stereogenic or asymmetric centers, such as one or more asymmetric carbon atoms, and thus may give rise to optically pure enantiomers, mixtures of enantiomers, racemates, enantiomer-pure diastereomers, mixtures of diastereomers, epimers, and other stereoisomeric forms that may be defined, in terms of absolute stereochemistry, as (R)-, (S)- or (i?,5)-configured, preferably in the (R)- or ( ⁇ -configuration.
• Such isomers can be obtained by methods within the knowledge of one skilled in the art, e.g. by stereochemical ⁇ controlled synthesis using chiral synthons or chiral reagents, or by means of classical separation techniques, such as chromatographic or crystallization methods, or by other methods known in the art, such as through formation of diastereomeric salts, for example by salt formation with an enantiomerically pure chiral acid, or by means of chromatography, for example by using chromatographic materials modified with chiral ligands.
• the present invention refers to compounds containing centers of any geometric asymmetry, like, for example, unsymmetrically substituted olefinic double bond, including E or Z geometric isomers and mixtures thereof. Generally, pure isomers of compounds of Formula I are preferred over isomeric mixtures.
• the compounds of Formula I may be used in the form of pharmaceutically acceptable salts.
• pharmaceutically acceptable salts refers to relatively nontoxic, inorganic or organic acid and base addition salts, which retain the biological effectiveness and properties of the parent compound, and which are not biologically or otherwise undesirable (see, e.g., Berge et al., J. Pharm. Sci. 1977, 66, 1- 19).
• Certain compounds of the present invention can contain one or more basic functional groups, such as amino, alkylamino, or arylamino, and, thus, be capable of forming pharmaceutically acceptable acid addition salts.
• These acid addition salts may be prepared by standard procedures in a suitable solvent from the parent compound of Formula I, with an appropriate amount of an inorganic acid, including, but not limited to, for example, hydrochloric acid, hydrobromic acid, sulfuric acid, or phosphoric acid; or of an organic acid, including, but not limited to, acetic acid, propionic acid, octanoic acid, decanoic acid, glycolic acid, pyruvic acid, oxalic acid, maleic acid, malonic acid, succinic acid, fumaric acid, tartaric acid, citric acid, ascorbic acid, amino acids, such as glutamic acid or aspartic acid, benzoic acid, cinnamic acid, salicylic acid, mandelic acid, methanesulfonic acid, ethan
• Certain compounds of the present invention may, on the other hand, contain one or more acidic functional groups and, thus, be capable of forming pharmaceutically acceptable base addition salts.
• These salts can be prepared by addition of an appropriate amount, usually in stoichiometric ratio, of an alkaline reagent, such as hydroxide, carbonate or alkoxide, containing the appropriate cation, to the free acid in a suitable solvent.
• an alkaline reagent such as hydroxide, carbonate or alkoxide, containing the appropriate cation
• Preferred inorganic salts include, but are not limited to, ammonium, sodium, potassium, calcium or magnesium, also zinc salts and the like.
• Preferred salts derived from organic bases include, but are not limited to, salts of primary, secondary, and tertiary amines, substituted amines, cyclic amines, and basic ion exchange resins, such as isopropylamine, trimethylamine, diethylamine, triethylamine, tripropylamine, ethanolamine, lysine, arginine, iV-ethylpiperidine, piperidine, polyamine resins, and the like.
• basic ion exchange resins such as isopropylamine, trimethylamine, diethylamine, triethylamine, tripropylamine, ethanolamine, lysine, arginine, iV-ethylpiperidine, piperidine, polyamine resins, and the like.
• Compounds of the present invention containing both acidic and basic groups can also form internal salts (zwitter ions).
• pharmaceutically unacceptable salts for example perchlorates, picolinates, picrates, or the like.
• pharmaceutically acceptable salts or free compounds are employed, where applicable in the form of pharmaceutical preparations, and these are therefore preferred.
• Certain compounds of Formula I may exist in solvated as well as unsolvated forms, such as, for example, hydrated forms, or their crystals may, for example, include the solvent used for crystallization. Different crystalline forms may be present.
• the present invention encompasses all such solvated and unsolvated forms.
• prodrug refers to pharmacologically inactive precursors of a drug that may be converted into its therapeutically active form under physiological conditions in vivo, for example, when they undergo solvolysis, or enzymatic degradation in blood, or in cells (Bundgard H., “Design of Prodrugs", pp. 7-9, 21-24, Elsevier, Amsterdam (1985); Silverman R. B., “The Organic Chemistry of Drug Design and Drug Action", pp. 352-401, Academic Press, San Diego, CA (1992); Higuchi T. et al., "Pro-drug as Novel Delivery Systems", A.C.S. Symposium Series, Vol. 14).
• prodrug also includes any covalently bonded carriers, which release the active parent compound in vivo when administered to a mammal.
• Prodrug modifications of a compound often offer advantages of solubility, bioavailability, absorption, tissue compatibility, tissue distribution, or delayed release in the mammalian organism.
• Prodrugs are variations or derivatives of the compounds of Formula I, which have groups cleavable under metabolic conditions, for example, pharmaceutically acceptable esters, or amides. Such groups can be cleaved enzymatically or non-enzymatically, or hydrolytically to the free hydroxy, carboxy, or amino group of the active parent compound.
• the prodrug is a reduced form, which is oxidized in vivo to the therapeutic compound, for example, a thiol, which is oxidized to a sulfonate or sulfate, or an alcohol, which is oxidized to a carboxylic acid.
• pharmaceutically acceptable esters refers to relatively non-toxic, esterified products of the parent compound. These esters can be prepared in situ during the final isolation and purification of the compounds, or by separately reacting the purified compounds in its free acid or hydroxyl form with a suitable esterifying agent.
• Carboxylic acids can be converted into esters via treatment with an alcohol in the presence of a catalyst.
• Hydroxyl containing derivatives can be converted into esters via treatment with an esterifying agent such as alkanoyl halides.
• the term further includes lower hydrocarbon groups capable of being solvated under physiological conditions, for example, alkyl esters, preferred methyl, ethyl, and propyl esters, methoxymethyl esters, methylthiomethyl esters, pivaloyloxymethyl esters and the like (see, e.g., Berge et al., J. Pharm. Sci. 1977, 66, 1-19).
• the compounds of the present invention have useful, in particular pharmacologically useful, properties. They are able to specifically antagonize the effect of endogenous PGD 2 on the CRTH2 receptor, and may be used for the prevention and/or treatment of chronic and acute allergic immune disorders comprising allergic asthma, rhinitis, chronic obstructive pulmonary disease (COPD), dermatitis, inflammatory bowel disease, rheumatoid arthritis, allergic nephritis, conjunctivitis, atopic dermatitis, bronchial asthma, food allergy, systemic mast cell disorders, anaphylactic shock, urticaria, eczema, itching, inflammation, ischemia-reperfusion injury, cerebrovascular disorders, pleuritis, ulcerative colitis, eosinophil-related diseases comprising Churg- Strauss syndrome and sinusitis, basophil-related diseases, comprising basophilic leukemia and basophilic leukocytosis in humans and other mammals.
• a compound or a pharmaceutical composition of the invention may thus be used as a drug (medicine) or therapeutic agent for prevention and/or treatment of both chronic and acute allergic/immune disorders such as those mentioned above, especially allergic asthma, rhinitis, COPD, dermatitis, inflammatory bowel disease, and rheumatoid arthritis.
• the compounds of Formula I may be used as standard or reference compounds in tests or assays involving the inhibition of the CRTH2 receptor. Such compounds could be made commercially available for use as a reference, quality standard or control, for example in pharmaceutical research when developing new assays or protocols related to CRTH2 activity.
• compounds of Formula I, or salts, or prodrugs thereof antagonize the PGD 2 activation of the CRTH2 receptor.
• the biological effect of such compounds may be tested in a variety of in vitro, ex vivo and in vivo assays.
• the ability of the compounds of Formula I to bind to the CRTH2 receptor may be measured by methods similar to those described in Sawyer N. et al, Br. J. Pharmacol., 2002, 137, 1163-1172 and by the method described below in the experimental part.
• IC 50 values i. e. the concentrations where half-maximal inhibition of the interaction is found
• concentrations where half-maximal inhibition of the interaction is found in the range of 0.001 to 10 ⁇ M, preferably values below 1 ⁇ M, in particular values below 0.05 ⁇ M, are found with test compounds of Formula I.
• Exemplary IC 50 values determined in this test are given below in Table 68.
• a functional assay with cells expressing the human CRTH2 receptor may be used to detect changes in the levels of intracellular calcium concentration following compound treatment. After addition of the compound the cells are challenged with PGD 2 . In a Fluorescent Imaging Plate Reader (FLIPR , Molecular Devices, Sunnyvale, California) fluorescence emission is recorded during both additions, emission peak values above base level after PGD 2 addition were exported, normalized to low controls (no PGD 2 ) and high controls (no active compound). The relative values of the remaining activity were used to determine IC 50 values by curve fitting the data to a single site to a four-parameter logistic sigmoid dose response curve of the equation (A+((B-A)/(l+((C/x) ⁇ D))).
• IC 50 values i.e. the concentration of a compound at which the remaining activity is 50%
• test compounds of Formula I Exemplary IC 5 O values determined in this test are given below in Table 69.
• a compound of Formula I according to the invention may show therapeutic efficacy against chronic and acute allergic/immune disorders such as allergic asthma, rhinitis, chronic obstructive pulmonary disease (COPD), dermatitis, inflammatory bowel disease, and rheumatoid arthritis.
• chronic and acute allergic/immune disorders such as allergic asthma, rhinitis, chronic obstructive pulmonary disease (COPD), dermatitis, inflammatory bowel disease, and rheumatoid arthritis.
• COPD chronic obstructive pulmonary disease
• a compound of Formula I, a pharmaceutically acceptable salt or a prodrug thereof can be administered alone in pure form or in combination with one or more other therapeutic agents, possible combination therapy taking the form of fixed combinations or the administration of a compound of the invention and one or more other therapeutic agents being staggered or given independently of one another, or the combined administration of fixed combinations and one or more other therapeutic agents.
• a compound of Formula I can besides or in addition be administered especially for prevention and/or treatment of both chronic and acute allergic or immune disorders in combination with other inflammatory diseases. Long-term therapy is equally possible as is adjuvant therapy in the context of other treatment strategies, as described above. Other possible treatments are preventive therapies, for example in patients at risk.
• the invention relates also to pharmaceutical compositions comprising compounds of Formula I, to their use in therapeutic, in a broader aspect of the invention also prophylactic treatment or a method of treatment of the diseases mentioned above, to the compounds for said use and to the preparation of pharmaceutical formulations (medicines).
• the pharmaceutically acceptable compounds of the present invention may be used, for example, for the preparation of pharmaceutical compositions that comprise an effective amount of the active ingredient together or in admixture with a significant amount of one or more inorganic, organic, solid or liquid, pharmaceutically acceptable carriers.
• the invention relates also to a pharmaceutical composition that is suitable for administration to a warm-blooded animal, especially a human (or to cells or cell lines derived from a warm-blooded animal, especially a human, for the treatment or, in a broader aspect of the invention, prevention of (i.e. prophylaxis against) a disease that responds to blockade of the interaction of the CRTH2 receptor with PGD 2 , comprising an amount of a compound of Formula I or a pharmaceutically acceptable salt or a prodrug thereof, which is effective for said inhibition, together with at least one pharmaceutically acceptable carrier.
• compositions according to the invention are those for enteral administration, such as nasal, buccal, rectal, dermal or, especially oral administration, and for parenteral administration, such as intramuscular, intravenous or subcutaneous, intrastemal, intravitreal, injection or infusion, to warm-blooded animals, especially humans.
• Such compositions comprise an effective dose of the pharmaceutically active ingredient, alone or together with a significant amount of a pharmaceutically acceptable carrier.
• the dosage of the active ingredient depends on the species of warm-blooded animal, the body weight, the age and the individual conditions, individual pharmacokinetic data, the disease to be treated and the mode of administration.
• the invention relates also to a process or a method for the treatment of a pathological condition mentioned hereinabove, especially a disease, which responds to blockade of the interaction of the CRTH2 receptor with PGD 2 , especially allergic asthma, rhinitis, chronic obstructive pulmonary disease (COPD), dermatitis, inflammatory bowel disease, and rheumatoid arthritis.
• a pathological condition mentioned hereinabove especially a disease, which responds to blockade of the interaction of the CRTH2 receptor with PGD 2 , especially allergic asthma, rhinitis, chronic obstructive pulmonary disease (COPD), dermatitis, inflammatory bowel disease, and rheumatoid arthritis.
• COPD chronic obstructive pulmonary disease
• dermatitis dermatitis
• inflammatory bowel disease inflammatory bowel disease
• rheumatoid arthritis rheumatoid arthritis.
• the dose to be administered to warm-blooded animals is preferably from approximatively 3 mg to approximatively 3O g, more preferably from approximatively 10 mg to approximatively 1000 mg per person per day, divided preferably into 1 to 3 single doses which may, for example, be of the same size.
• 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, the weight, and response of the individual patient, the severity of the patient's symptoms, and the like, for example, children usually receive half of the adults dose.
• compositions comprise from approximately 1% to approximately 95%, preferably from approximately 20% to approximately 90%, active ingredient.
• Pharmaceutical compositions according to the invention may be, for example, in unit dosage forms such as coated and uncoated tablets, pills, ampoules, vials, suppositories, dragees, or capsules. Further dosage forms are, for example, ointments, creams, pastes, emulsions, foams, chewable gums, tinctures, lip-sticks, drops, sprays or aerosols, syrups or elixirs, dispersions, transdermal patches or pads, or via an intravitreal device that releases the compound in a sustained capacity, and the like. Examples are capsules containing from about 0.05 g to about 1.0 g active ingredient.
• compositions of the present invention are prepared in a manner known, per se, for example by means of conventional mixing, granulating, coating, dissolving, lyophilizing or confectioning processes.
• Solutions of the active ingredient, and also suspensions, and especially isotonic aqueous solutions or suspensions are preferably used, it being possible, for example in the case of lyophilized compositions, that comprise the active ingredient alone or together with a carrier, for example mannitol, for such solutions or suspensions to be produced prior to use.
• the pharmaceutical compositions may be sterilized and/or may comprise excipients, for example preservatives, stabilizers, wetting agents and/or emulsifiers, solubilizers, salts for regulating osmotic pressure and/or buffers and are prepared in a manner known per se, for example by means of conventional dissolving or lyophilizing processes.
• the said solutions or suspensions may comprise viscosity- increasing substances, such as sodium carboxymethylcellulose, carboxymethylcellulose, dextran, polyvinylpyrrolidone or gelatin.
• Suspensions in oil comprise as the oil component the vegetable, synthetic or semi ⁇ synthetic oils customary for injection purposes.
• liquid fatty acid esters that contain as the acid component a long-chain fatty acid having from 8 to 22, especially from 12 to 22, carbon atoms, for example lauric acid, tridecylic acid, myristic acid, pentadecylic acid, palmitic acid, margaric acid, stearic acid, arachidic acid, behenic acid or corresponding unsaturated acids, for example oleic acid, elaidic acid, erucic acid, brasidic acid or linoleic acid, if desired with the addition of antioxidants, for example vitamin E, ⁇ -carotene or 3,5- ⁇ i-tert- butyl-4-hydroxytoluene.
• the alcohol component of those fatty acid esters has a maximum of 6 carbon atoms and is mono- or poly-hydroxy, for example a mono-, di- or trihydroxy, alcohol, for example methanol, ethanol, propanol, butanol, or pentanol or the isomers thereof, but especially glycol and glycerol.
• fatty acid esters are therefore to be mentioned: ethyl oleate, isopropyl myristate, isopropyl palmitate, "Labrafil M2375” (polyoxyethylene glycerol trioleate, Gattefosse, Paris), "Miglyol 812” (triglyceride of saturated fatty acids with chain length of C8 to C 12, HuIs AG, Germany), but especially vegetable oils, such as cottonseed oil, almond oil, olive oil, castor oil, sesame oil, soybean oil and more especially groundnut oil.
• vegetable oils such as cottonseed oil, almond oil, olive oil, castor oil, sesame oil, soybean oil and more especially groundnut oil.
• injection or infusion compositions are prepared in customary manner under sterile conditions; the same applies also to introducing the compositions into ampoules or vials and sealing the containers.
• compositions for oral administration can be obtained by combining the active ingredient with solid carriers, if desired granulating a resulting mixture, and processing the mixture, if desired or necessary, after the addition of appropriate excipients, into tablets, dragee cores or capsules. It is also possible for them to be incorporated into plastics carriers that allow the active ingredients to diffuse or be released in measured amounts.
• Suitable carriers are especially fillers, such as sugars, for example lactose, saccharose, mannitol or sorbitol, cellulose preparations and/or calcium phosphates, for example tricalcium phosphate or calcium hydrogen phosphate, and binders, such as starch pastes using for example corn, wheat, rice, or potato starch, gelatin, tragacanth, methylcellulose, hydroxypropylmethylcellulose, sodium carboxymethylcellulose and/or polyvinylpyrrolidone, and/or, if desired, disintegrators, such as the above-mentioned starches, and/or carboxymethyl starch, crosslinked polyvinylpyrrolidone, agar, alginic acid or a salt thereof, such as sodium alginate.
• fillers such as sugars, for example lactose, saccharose, mannitol or sorbitol
• cellulose preparations and/or calcium phosphates for example tricalcium phosphate or calcium hydrogen phosphate
• Excipients are especially flow conditioners and lubricants, for example silicic acid, talc, stearic acid or salts thereof, such as magnesium or calcium stearate, and/or polyethylene glycol.
• Dragee cores are provided with suitable, optionally enteric, coatings, there being used, inter alia, concentrated sugar solutions which may comprise gum Arabic, talc, polyvinylpyrrolidone, polyethylene glycol, and/or titanium dioxide, or coating solutions in suitable organic solvents, or, for the preparation of enteric coatings, solutions of suitable cellulose preparations, such as ethylcellulose phthalate or hydroxypropylmethylcellulose phthalate.
• Capsules are dry-filled capsules made of gelatin and of soft sealed capsules made of gelatine and a plasticiser, such as glycerol or sorbitol.
• the dry-filled capsules may comprise the active ingredient in the form of granules, for example with fillers, such as lactose, binders, such as starches, and/or glidants, such as talc or magnesium stearate, and if desired with stabilizers.
• the active ingredient is preferably dissolved or suspended in suitable oil excipients, such as fatty oils, paraffin oil or liquid polyethylene glycols, it being possible also for stabilizers and/or antibacterial agents to be added.
• suitable oil excipients such as fatty oils, paraffin oil or liquid polyethylene glycols, it being possible also for stabilizers and/or antibacterial agents to be added.
• Dyes or pigments may be added to the tablets or dragee coatings or the capsule casings, for example for identification purposes or to indicate different dose
• aqueous solutions of an active ingredient in water- soluble form for example of a water-soluble salt, or aqueous injection suspensions that contain viscosity-increasing substances and stabilizers, are especially suitable.
• the active ingredient optionally together with excipients, can also be in the form of a lyophilizate and be made into a solution before parenteral administration by the addition of solvents.
• novel compounds of Formula I can be manufactured in accordance with the invention by a) hydrolyzing a precursor of the general Formula II
• R 1 -R 7 and n are as in Formula I and R represents an alkyl group, preferably ethyl or fert-butyl, with the exception of:
• L 1 is a leaving group, or c) S-alkylating a mercapto derivative of the general Formula
• R .1 - ⁇ R>4 are as in Formula I,
• R > 5 -R and n are as in Formula I and L is a leaving group, and, if desired, converting a compound of Formula I into a pharmaceutically acceptable salt.
• a synthesis of 2-sulfanyl-benzoimidazol-l-yl-acetic acid of Formula I starts by alkylating a 2-chlorobenzoimidazole of Formula 1 with a compound of Formula L 1 - CH 2 CO 2 R, wherein R represents an alkyl group, preferably ethyl or fert-butyl, and L 1 is a leaving group, in a suitable polar solvent such as JV, N-dimethylformamide, acetone, acetonitrile or the like, in the presence of a base, such as potassium carbonate, cesium carbonate, sodium hydride or the like, to yield an alkyl (2-chloro-benzoimidazol-l-yl)- acetate of Formula 2, as outlined in Scheme 1.
• Suitable is a leaving group L 1 such as halo, in particular bromo or chloro.
• a compound of Formula 1 ⁇ -CH 2 CO 2 R is tert-butyl or ethyl bromoacetate.
• a solution of a chlorobenzoimidazole of Formula 1 in acetone is stirred with e.g. tert-bvdyl bromoacetate in presence of potassium carbonate at reflux, or in DMF at room temperature.
• Substituted l-fluoro-2-nitro-benzene of Formula 12 is converted to a compound of Formula 13.1 by reacting with an amino acid ester in a suitable solvent such as DMSO, EtOH or the like at elevated temperature from 50°C to 100°C (McFarlane et al, J. Chem. Soc. Perkin Trans. 1 1988, 691-696).
• a catalyst such as palladium on charcoal in a solvent like tetrahydrofuran leads to a substituted aniline derivative of Formula 13.2, which then is reacted with thiocarbonyle diimidazole to yield Intermediate 3a (Wright, J. L. et al, J. Med. Chem., 2000, 43, 3408-3419; Breslin, H. J. et al, J. Med. Chem. 1995, 38, 771- 793).
• a reagent of Formula L 2 -(CH 2 ) n -C-R 5 R 6 R 7 is an optionally substituted alkyl halide, particularly an alkyl chloride, or an alkyl bromide, such as commercially available 2-(2-bromo-ethyl)-isoindole-l,3-dione; (2-bromo-ethyl)-carbamic acid tert- butyl ester; (3-bromo-propyl)-carbamic acid tert-butyl ester; (2-bromo-ethyl)- cyclohexane; 1-bromo-hexane; 1-bromo-pentane; 4-bromo-but-l-ene; 1-bromo-butane; bromo-cyclopentane; (l-bromo-ethyl)-benzene; bromo-phenyl-acetic acid methyl ester; 7-bromo-brom
• a reagent of Formula L 2 -(CH 2 ) n -C-R 5 R 6 R 7 such as benzyl-(3-chloro- propyl)-carbamic acid ester; 5-bromo-pentanoic acid butyl-phenyl-amide; 5- bromo- 1 -(3 ,4-dihydro-2H-quinolin- 1 -yl)-pentan- 1 -one; 5 -bromo-pentanoic acid methyl-phenyl-amide; 1 -(2-bromo-ethoxy)-naphthalene; 2-(2-bromo-ethoxy)- naphthalene; 2-(3-chloro-propyl)-2,3 -dihydro-isoindol- 1 -one; 1 -(3 -chloro-propyl)- 1,3- dihydro-benzoimidazol-2-one; 3-(3-chlor
• a novel alkyl halide of Formula 1/-(CHa) n -C-R 5 R 6 R 7 such as (3-chloro-propyl)-phenethyl-carbamic acid fert-butyl ester; (3-chloro-propyl)-(4- piperidin-l-yl-phenyl)-carbamic acid tert-butyl ester; 4-[tert-butoxycarbonyl-(3-chloro- propyl)-amino] -benzoic acid ethyl ester; (3-chloro-propyl)-cyclopropyl-carbamic acid tert-butyl ester; (3-chloro-propyl)-phenyl-carbamic acid tert-butyl ester; (3-chloro- propyl)-(2,2-diphenyl-ethyl)-carbamic acid tert-butyl ester; (3-chloro-propyl
• Preferred alkyl halides of Formula L 2 -(CH 2 ) n -C-R 5 R 6 R 7 are depicted in Formula 5.1 and 5.2.
• Such compounds can either be prepared and isolated as such, or generated in situ, from a dihaloalkane of Formula Ha ⁇ -(CH 2 VHaI 2 , wherein Hal 1 and Hal 2 represent halo, independently selected from chloro, bromo, or iodo; such as l-chloro-2- iodo-ethane, 1,2-dibromo-ethane, or 1,2-dichloro-ethane; l-chloro-3-iodo-propane, 1,3- dibromo-propane, or 1,3-dichloropropane; l-chloro-4-iodo-butane, 1,4-dibromo- butane, or 1,4-dichloro-butane; with a substituted amine of hereinabove
• a 2-aryloxyethylbromide is obtained by reacting a hydroxyarene with dibromoethane in aqueous sodium hydroxide (Slyn'ko, N. M.; Tormyshev, V. M. Russ. Journal. Org. Chem. 2000, 36(2), 254-257).
• a primary amine of Formula H 2 NR wherein R represents alkyl, cycloalkyl, cyclylalkyl, or arylalkyl, reacts with hereinabove defined dihaloalkane of Formula Hal 1 -(CH 2 ) n -Hal 2 forming a secondary amine of Formula 5.3, which then is transformed to its respective amide, sulfonamide, carbamate, urethane of Formula 5.1, wherein R 9 represents alkenylcarbonyl, alkoxycarbonyl, alkylcarbamoyl, alkylcarbonyl, alkylsulfonyl, arylalkenylcarbonyl, arylalkylcarbonyl, arylcarbamoyl, arylcarbonyl, arylalkylsulfonyl, arylsulfonyl, cycloalkylcarbonyl, or cyclylalkylcarbonyl, wherein R represents alkyl,
• an alkylating reagent of Formula L 2 -(CH 2 ) n -C-R 5 R 6 R 7 can be obtained through transformation of its respective hydroxy analog of Formula R 5 R 6 R 7 C-(CH 2 V OH, by means of known methods.
• alkylating reagents as depicted in Formula 5.4, 5.5, 5.4bis, are obtained by:
• halogenation of the methyl group of the benzene and pyridinyl derivatives 6 and 7, respectively with known methods, e.g. preferably by means of N-X succinimide, whereby X represents halogen, such as chloro or bromo, iodo, in a suitable solvent such as tetrachloromethane, chloroform or the like (de Meijere, A. et al., Chem. Ber. 1993, 126, 1635-1641).
• R' alkyl, alkoxy
• R' alkyl, alkoxy
• hydroxyalkoxyacetophenone and alkoxyacetophenone Ibis are obtained by alkylation of hydroxyacetophenone with the corresponding hydroxyalkyl or alkyl halide (Mandoli, A. et al Tetrahedron Asymmetry 2003, 14, 3647-3650).
• Another preferred alkyl halide of Formula L 2 -(CH 2 ) n -C-R 5 R 6 R 7 also comprises a structure of Formula 5.6, wherein R 7 represents alkoxy, alkyl-arylamino, arylalkyl- arylamino, or 3,4-dihydro-2i7-quinoline.
• R 7 represents alkoxy, alkyl-arylamino, arylalkyl- arylamino, or 3,4-dihydro-2i7-quinoline.
• a solution of an Intermediate of Formula 3 in acetone is heated at reflux with an alkylating agent of Formula L 2 -(CH 2 ) n -C-R 5 R 6 R 7 in the presence of a base such as potassium carbonate.
• a base such as potassium carbonate.
• L 2 representing chloro, or bromo
• addition of a catalytic amount of potassium iodide might be beneficial.
• alkylcarbonyl-3-hydroxymethyl-piperidine examples are alkylcarbonyl-3-hydroxymethyl-piperidine; alkyloxycarbonyl-3-hydroxymethyl- piperidine, such as tert-butyloxycarbonyl-3-hydroxymethyl-piperidme; arylcarbonyl-3- hydroxymethyl-piperidine; alkylsulfonyl-3 -hydroxymethyl-piperidine, arylsulfonyl-3 - hydroxymethyl-piperidine, arylalkyloxycarbonyl-3 -hydroxymethylazetidine, and arylalkylcarbonyl-2-hydroxymethylazetidine.
• An Intermediate of Formula 3 can also be alkylated to yield a compound of Formula 4.1, with a reagent of Formula L 2 -(CH 2 ) n -C-R 5 R 6 R 7 , wherein either one, e.g. R 7 , of the substituents R 5 , R 6 , or R 7 , is representing a functional group (FG), opted for further transformations.
• FG functional group
• Such functional groups include carboxy; halo, such as chloro or bromo; hydroxyl; and amino.
• a FG group such as amino is introduced in its protected form using a standard protecting group (PG) such as /er/-butoxycarbonyl, benzyloxycarbonyl, or phthaloyl.
• PG standard protecting group
• a compound of Formula 4.1 bearing a FG such as carboxy can be transformed to alkoxycarbonyl, N-alkyl-N-arylalkyl-carbamoyl, N-aryl-N-arylalkyl-carbamoyl, N- alkyl-N-aryl-carbamoyl, by means of methods known to a skilled person.
• a FG such as halo can be transformed to aryloxy, heterocyclyloxy; or an amino of hereinabove defined Formula NR R , by means of known methods.
• a FG such as hydroxy can be converted to aryloxy, heterocyclyloxy; or an amino of hereinabove defined Formula NR 8 R 9 , by means of known functional group transformations.
• a FG such as amino (NH 2 ) can be converted stepwise to an amino of hereinabove defined Formula NR 8 R 9 .
• Preferred modifications of the nitrogen atom include acylation, alkoxycarbonylation, carbamoylation, or sulfonylation, applying standard conditions.
• R 5 in a compound of Formula 4 represents hydrogen
• R 6 and R 7 are forming a pyrrolidine, or piperidinyl ring, whereby a protecting group (PG) is appended to the pyrrolidinyl, or piperidinyl nitrogen atom, as depicted in Formula 4.2.
• a standard protecting group (PG) like e.g. fe/Y-butoxycarbonyl, or benzyloxycarbonyl, is removed by means of standard conditions, yielding a compound of Formula 4.3.
• the nitrogen atom is being further modified with hereinabove defined substituent R 10 , affording a Precursor of Formula 4.4.
• Preferred modifications of the nitrogen atom include acylation, alkoxycarbonylation, carbamoylation, or sulfonylation, applying standard conditions.
• R 5 and R 6 in a compound of Formula 4 represent hydrogen and R 7 is an aromatic ring bearing two substituents R and X as depicted in Formula 4.6, wherein R corresponds to an alkoxy group and X represents a halogen atom such as bromine; or in Formula 4.8 wherein R represents hydroxy and X represents an alkyloxy group.
• the halogen atom can be replaced by a group R using standard coupling methods known by a person skilled in the art, for example a Suzuki coupling and yielding a compound as depicted in Formula 4.7.
• R 18 represents an aromatic ring such as a phenyl group.
• a compound of Formula 4.8 might be obtained in the typical conditions of a Mitsunobu reaction between an Intermediate of Formula 3 or Formula 3a and a suitable hydroxymethylbenzoic acid.
• a compound of Formula 4.8 is subsequently modified so that the hydroxy group R is replaced by a primary or secondary amine using standard coupling methods such as with HOBt and EDC (N-(3-dimethylaminopropyl)-N'- ethylcarbodiimide) hydrochloride in a DMF / dichloromethane mixture to yield primary or secondary aromatic amides as depicted in Formula 4.9.
• Examples are compounds wherein R 19 is an indolino-, butylamino-, morpholino-, benzylamino-, diethylamino- or benzylethylamino-group.
• R 5 and R 6 represent a hydrogen atom and R 7 is an aromatic ring bearing a ketone, as depicted in Formula I-b
• R 7 is an aromatic ring bearing a ketone
• the preferred reaction condition is stirring with sodium borohydride in methanol.
• I-b X alkyloxy
• R ⁇ i alkyl
• I-c X alkyloxy
• R 20 hydroxy, alkoxy
• a compound of Formula I-a can be further oxidized at the sulphur atom by a method known to a person skilled in the art to yield a sulfoxide as depicted in Formula I-d.
• Starting 2-chlorobenzoimidazole of Formula 1 can be prepared from the corresponding 2-hydroxybenzimidazole of Formula 8 by means of phosphorous oxychloride, either neat or in a suitable solvent (Naef, R.; Balli, H., HeIv. Chem. Acta 1978, 61, 2958- 2973).
• 2-Chloro-5-nitrobenzimidazole is obtained following a method described in Jung, F.; Delvare, C; Boucherot, D.; Hamon, A. J. Med. Chem. 1991, 34, 1110-1116.
• a Precursor of Formula 4 can also be obtained following a preferred alternative synthetic route, e.g. by changing the sequence of reactions.
• starting IH- benzoimidazole-2-thiol of Formula 9 can be S-alkylated with hereinabove defined reagent of Formula L 2 -(CH 2 ) n -C-R 5 R 6 R 7 under aforementioned conditions to yield 2- alkylsulfanyl-lif-benzoimidazole of Formula 10, which then is iV-alkylated in a second step with tert-butyl or ethyl bromoacetate to a Precursor of Formula 4.
• Any further functional group manipulations, as discussed hereinabove for Intermediates 4.1, 4.2, 4.3, and 4.4, are preferably accomplished at this stage, prior to ester hydrolysis to the "final compound of Formula I.
• Starting li7-benzoimidazole-2-thiol of Formula 9 is obtained from 1,2-diaminobenzene of Formula 11, with carbon disulfide, thiocarbonyldiimidazole or potassium xanthogenate in a suitable solvent such as dichloromethane; or an alcohol such as methanol, ethanol, propanol; or water; or a mixture of an alcohol and water; in the presence of a base such as potassium hydroxide, sodium hydroxide, at elevated temperature between 50 and 100°C.
• a suitable solvent such as dichloromethane
• an alcohol such as methanol, ethanol, propanol
• water or a mixture of an alcohol and water
• a base such as potassium hydroxide, sodium hydroxide
• Preferred reaction conditions are those described in:
• KH 2 PO 4 potassium phosphate
• K 2 CO 3 potassium carbonate
• 1 liter, ⁇ : micro, m: milli, mol: mole
• M molar
• MeOH methanol
• Me methyl
• min minute
• MgSO 4 magnesium sulfate
• MS mass spectrometry
• N normality of solution
• NaHCO 3 sodium hydrogencarbonate
• Na 2 CO 3 sodium carbonate
• NaOH sodium hydroxide
• Na 2 SO 4 sodium sulfate
• NH 4 Cl ammonium chloride
• rt room temperature
• SOCl 2 thionyl chloride
• TFA trifluoroacetic acid
• THF tetrahydrofuran
• fo retention time.
• LC-I analytical HPLC on an XterraTM MS C 18 column (50 x 2.1 mm, 5 ⁇ m, Waters), with a linear gradient of water containing 0.06% formic acid (A) and acetonitrile containing 0.06% formic acid (B), from 5% to 95% B over 6 min; flow rate 0.25 ml/min, column temperature 30°C, detection at 200- 400 nm.
• LC-2 analytical HPLC on an XterraTM MS C 18 column (50 x 4.6 mm, 5 ⁇ m, Waters), with a linear gradient of water containing 0.06% formic acid (A) and acetonitrile containing 0.06% formic acid (B), from 5% to 95% B over 2 min; flow rate 0.75 ml/min, column temperature 30°C, detection at 200- 400 nm.
• LC-3 analytical HPLC on an Zorbax SB-AqTM column (50 x 4.6 mm, 5 ⁇ m, Agilent), with a linear gradient of water containing 0.06% formic acid (A) and acetonitrile containing 0.06% formic acid (B), from 5% to 95% B over 1 min; flow rate 3 ml/min, column temperature 30°C, detection at 200- 400 nm.
• Intermediate 3-IIa and Intermediate 3-IIb of the following Table 3 are prepared from a (1:1) mixture of f ⁇ rt-butyl (2-chloro-5-nitro-benzoimidazol-l-yl)-acetate (Intermediate 2-IIa) and its 6-nitro regioisomer (Intermediate 2-IIb) analogous to the procedure described for Intermediate 3-1. They are purified and separated by flash- chromatography on silica-gel (AcOEt / heptane, 1 :5).
• Examples A-02a to A-05a of the following Table 1 are prepared analogous to the procedure described for Example A-OIa, using Precursors A-02b to A-05b in place of A-OIb.
• Precursors A-02b to A-05b of the following Table 2 are prepared using a procedure analogous to that described for Precursor A-OIb, substituting the appropriate alkyl halide for 2-cyclohexylethyl bromide.
• Examples B-02a to B-05a of the following Table 4 are prepared analogous to the procedure described for Example B-OIa, using Precursors B-02b to B-05b in place of B-OIb.
• Example C-OIa [2-(2-Methoxy-benzylsulfanyl)-benzoimidazol- 1 -yl "
• -acetic acid A solution of tert-butyl [2-(2-methoxy-benzylsulfanyl)-benzoimidazol- 1 -yl]-acetate (Precursor C-OIb, 20 mg, 0.05 mmol) is stirred in TFA / dichloromethane (1:1, 4.0 ml) at rt overnight.
• Precursors C-02b to C-05b of the following Table 7 are prepared using a procedure analogous to that described for Precursor C-OIb, substituting the appropriate benzyl halide for 2-methoxybenzyl chloride.
• Examples D-02a to D-07a of the following Table 8 are prepared analogous to the procedure described for Example D-OIa, using Precursors D-02b to D-07b in place of D-OIb.
• Precursors D-OIb to D-07b of the following Table 9 are prepared using a procedure analogous to that described for Precursor D -02b, substituting the appropriate aryloxyalkylbromide or heterocyclyloxyalkylbromide for (2-bromo-ethoxy)-benzene.
• Formula t R [min] MS Data
• Examples E-02a to E-03a of the following Table 10 are prepared analogous to the procedure described for Example E-OIa, using Precursors E-02b and E-03b in place of E-OIb.
• Precursors E-02b to E-03b of the following Table 11 are prepared using a procedure analogous to that described for Precursor E-OIb, substituting the appropriate alkyl bromide for 6-bromo-hexanoic acid ethyl ester.
• Examples F-02a to F-05a of the following Table 12 are prepared analogous to the procedure described for Example F-OIa, using Precursors F-02b to F-05b in place of F- 01b.
• Precursors F-02b to F-05b of the following Table 13 are prepared using a procedure analogous to that described for Precursor F-OIb, substituting the corresponding JV, JV- disubstituted amine for JV-methylaniline.
• Examples G-02a to G-07a of the following Table 14 are prepared analogous to the procedure described for Example G-OIa, using Precursors G-02b to G-07b in place of G-OIb.
• Precursors G-02b to G-07b of the following Table 15 are prepared using a procedure analogous to that described for Precursor G-OIb, substituting the appropriate alkylating agent for G-OId.
• the resulting cloudy solution is allowed to stir for 1 h at rt and is added dropwise under inert atmosphere via a syringe onto a solution of iodochloropropane (268 ⁇ l, 2.5 mmol) in dry DMF (2 ml). The resulting solution is allowed to stir at rt overnight. By addition of water and evaporation under reduced pressure most of the DMF is removed from the crude mixture. The residue is dissolved in AcOEt (25 ml) and the resulting organic phase is washed 3 times with water and once with brine.
• Alkylating agents G-03d to G-07d of the following Table 16 are prepared using a procedure analogous to that described for alkylating agent G-OId, substituting the appropriate nitrogen containing heterocycle for 3-oxo-2,3-dihydro-indazole-l- carboxylic acid ethyl ester.
• Examples H-02a to H-I Ia of the following Table 17 are prepared analogous to the procedure described for Example H-OIa, using Precursors H-02b to H-I Ib in place of H-OIb.
• Precursors H-02b to H-I Ib of the following Table 18 are prepared using a procedure analogous to that described for Precursor H-OIb, substituting the appropriate alkylating agent for 5-bromo-hexanoic acid ethyl ester.
• Alkylating agents H-02d to H-09d of the following Table 19 are prepared using a procedure analogous to that described for alkylating agent H-08d, substituting the corresponding phenyl or pyridyl derivative analogue for 4-bromo-3-methyl-benzoic acid methyl ester.
• Example I-01a rac ⁇ 2-( 1 -Butyryl-piperidin-3 -ylmethylsulfanvD-benzoimidazol- 1 -yll -acetic acid rac [2-(Piperidin-3-ylmethylsulfanyl)-benzoimidazol-l-yl]-acetic acid hydrochloride (Precursor I-00a, 10 mg, 0.03 mmol) is suspended in dichloromethane (1 ml) and Et 3 N (12.88 mg, 16.6 ⁇ l, 0.10 mmol) as well as butyryl chloride (3.42 mg, 3.35 ⁇ l, 0.04 mmol) are added subsequently. The resulting mixture is stirred for 30 min at rt.
• Example I-01a is also synthesized starting from tert-butyl [2-(l-butyryl- piperidin-3 -ylmethylsulfanyl)-benzoimidazol- 1 -yl]-acetate (Precursor 1-01 b) : Precursor I-Olb (802 mg, 1.86 mmol) is dissolved in TFA / dichloromethane (1:1, 10 ml) and stirred overnight at rt. Evaporation of the solvents in vacuo gives an orange oil which is suspended in Et 2 O / heptane (1:1, 2 ml) and sonicated. After filtration, thourough rinsing with Et 2 O and drying, the title compound (670 mg) is obtained in 96% as a white solid.
• Examples I-02a to I- 13a of the following Table 20 are prepared analogous to the procedures described for Example 1-01 a.
• Precursor I-00a rac r2-(Piperidin-3-ylmethylsulfanyl)-benzoimidazol-l-yll-acetic acid hydrochloride
• rac tert-butyl [2-(l-tert- butyloxycarbonyl-piperidin-3-ylmethylsulfanyl)-benzoimidazol-l-yl]-acetate Precursor I-00b, 36 mg, 0.08 mmol.
• the mixture is stirred for 4 h at rt.
• the precipitated solid is filtered and rinsed with Et 2 O to yield quantitatively the title compound as a slightly yellow solid.
• Precursor 3-1 1 g, 3.79 mmol
• l-(3-chloromethyl-piperidin-l-yl)-butan-l-one alkylating agent I-01d, 771 mg, 3.79 mmol
• K 2 CO 3 (1.05 g, 7.58 mmol) in acetone (10 ml) is refiuxed for 36 h.
• Example J-OIa ⁇ 2-[3-(tgrt-Butoxycarbonyl-phenethyl-amino)-propylsulfanvn-benzoimidazol-l-vU- acetic acid tert-Buty ⁇ ⁇ 2- [3 -(tert-butoxycarbonyl-phenethyl-amino)-propylsulfanyl] - benzoimidazol-1-yl ⁇ -acetate (Precursor J-OIb, 12.7 mg, 0.025 mmol) is suspended in an aqueous 0.2 M NaOH solution (0.67 ml). After addition of THF (1.3 ml) the resulting solution is allowed to stir overnight at rt.
• Examples J-02a to J-07a of the following Table 21 are prepared analogous to the procedure described for Example J-OIa, using Precursors J-02b to J-07b in place of J- 01b.
• Precursors J-02b to J-07b from Table 22 are prepared by a procedure analogous to that described for Precursor J-OIb, using Intermediates J-02c to J-07c in place of J-OIc.
• Example K-OIa is synthesized analogous to the procedure described for Example J-OIa, using Precursor K-OIb in place of J-OIb.
• Examples K-02a to K-04a of the following Table 23 are prepared analogous to the procedures described for Example K-OIa, using Precursors K-02b to K-04b in place of K-OIb.
• Precursor K-OIb fert-Butyl ⁇ 2-r3-(butoxycarbonyl-phenethyl-amino)-propylsulfanyl]-benzoimidazol-l- yl> -acetate is generally prepared analogous to the procedure described for Precursor J-OIb 5 using K-OIc in place of J-OIc.
• Precursor K-OIb is prepared starting from tert-butyl (2-mercapto- benzoimidazol-l-yl)-acetate (Intermediate 3-1):
• Precursors K-02b to K-04b in Table 24 are prepared analogous to the procedures described for Precursor K-OIb.
• Phenethyl-carbamic acid tert-butyl ester (1107 mg, 5.0 mmol) is dissolved in dry DMF (7.75 ml). To this solution, sodium hydride (60 % w/w in oil, 302 mg, 7.55 mmol) is added under vigorous stirring and stirring is continued for 30 min. Then l-chloro-3- iodo-propane (250 mg, 5.0 mmol) is dropped into the solution followed by stirring for 2 h at rt and another hour at 50 0 C.
• Alkylating agent K-OId O-Chloro-propyD-phenethyl-carbamic acid butyl ester

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  • 2005-08-23 EP EP05778612A patent/EP1784182A1/de not_active Withdrawn

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