Novel thiazolo (4,5-D) pyrimidine compounds

Abstract

The invention provides certain thiazolopyrimidine compounds of formula (I) or a pharmaceutically acceptable salt or solvate thereof; processes and intermediates used in their preparation, pharmaceutical compositions containing them and their use in therapy.

1 . A compound of formula (I) or a pharmaceutically acceptable salt or solvate thereof:  
       
         
           
           
               
               
           
         
       
       in which 
 R 1  represents a C 3 -C 7  carbocyclic, C 1 -C 8  alkyl, C 2 -C 6  alkenyl or C 2 -C 6  alkynyl group, each of the groups being optionally substituted by one or more substituent groups independently selected from halogen atoms, —OR 4 , —NR 5 R 6 , —CONR 5 R 6 , —COOR 7 , —NR 8 COR 9 , —SR 10 , —SO 2 R 10 , —SO 2 NR 5 R 6 , —NR 8 SO 2 R 9  or an aryl or heteroaryl group, both of which may be optionally substituted by one or more substituents independently selected from halogen atoms, cyano, nitro, —OR 4 , —NR 5 R 6 , —CONR 5 R 6 , —COOR 7 , —NR 8 COR 9 , —SR 10 , —SO 2 R 10 , —SO 2 NR 5 R 6 , —NR 8 SO 2 R 9 , C 1 -C 6  alkyl or trifluoromethyl groups;  
 R 2  and R 3  each independently represent a hydrogen atom, or a C 3 -C 7  carbocyclic, C 1 -C 8  alkyl, C 2 -C 6  alkenyl or C 2 -C 6  alkynyl group, the latter four groups may be optionally substituted by one or more substituent groups independently selected from:  
 (a) halogen atoms, —OR 4 , —NR 5 R 6  —CONR 5 R 6 , —COOR 7 , —NR 8 COR 9 , —SR 10 , —SO 2 R 10 , —SO 2 NR 5 R 6 , —NR 8 SO 2 R 9    
 (b) a 3-8 membered ring optionally containing one or more atoms selected from O, S, NR 8  and itself optionally substituted by C 1 -C 3 -alkyl or halogen,  
 (c) an aryl group or heteroaryl group each of which may be optionally substituted by one or more substituents independently selected from halogen atoms, cyano, nitro, —OR 4 , —NR 5 R 6 , —CONR 5 R 6 , —NR 8 COR 9 , —SO 2 NR 5 R 6 , —NR 8 SO 2 R 9 , C 1 -C 6  alkyl and trifluoromethyl groups;  
 R 4  represents hydrogen, C 1 -C 6  alkyl or a phenyl group the latter two of which may be optionally substituted by one or more substituent groups independently selected from halogen atoms, phenyl, —OR 11  and —NR 12 R 13    
 R 5  and R 6  independently represent a hydrogen atom or a C 1 -C 6  alkyl or phenyl group the latter two of which may be optionally substituted by one or more substituent groups independently selected from halogen atoms, phenyl, —OR 14  and —NR 15 R 16 , —CONR 15 R 16 , —NR 15 COR 16 , —SONR 15 R 16 , NR 15 SO 2 R 16 or    
 R 5  and R 6  together with the nitrogen atom to which they are attached form a 4- to 7-membered saturated heterocyclic ring system optionally containing a further heteroatom selected from oxygen and nitrogen atoms, which ring system may be optionally substituted by one or more substituent groups independently selected from phenyl, —OR 14 , —COOR 14 , —NR 15 R 16 , —CONR 15 R 16 , —NR 15 COR 16 , —SONR 15 R 16 , NR 15 SO 2 R 16  or C 1 -C 6  alkyl, itself optionally substituted by one or more substituents independently selected from halogen atoms and —NR 15 R 16  and —OR 17  groups;  
 R 10  represents a hydrogen atom or a C 1 -C 6 -alkyl or a phenyl group, the latter two of which may be optionally substituted by one or more substituent groups independently selected from halogen atoms, phenyl, —OR 17  and —NR 15 R 16 ; and  
 each of R 7 , R 8 , R 9 , R 11 , R 12 , R 13 , R 14  R 15 , R 16 , R 17  independently represents a hydrogen atom or a C 1 -C 6 , alkyl, or a phenyl group.  
 
     
     
         2 . A compound according to  claim 1 , wherein R 1  represents an optionally substituted benzyl group.  
     
     
         3 . A compound according to  claim 1 , wherein one of R 2  and R 3  is hydrogen and the other is C 1 -C 8  alkyl substituted by hydroxy.  
     
     
         4 . A compound according to  claim 1  selected from: 
 7-[(2-Hydroxy-1,1-dimethylethyl)amino]-5-[(phenylmethyl)thio]thiazolo[4,5-d]pyrimidin-2(3H)-one,  
 (R)-7-[[1-(Hydroxymethyl)propyl]amino]-5-[(phenylmethyl)thio]thiazolo[4,5-d]pyrimidin-2(3H)-one,  
 (R)-7-[(2-Hydroxy-1-methylethyl)amino]-5-[(phenylmethyl)thio]thiazolo[4,5-d]pyrimidin-2(3H)-one,  
 5-[[(2,3-Difluorophenyl)methyl]thio]-7-[(2-hydroxy-1,1-dimethylethyl)amino]thiazolo[4,5-d]pyrimidin-2(3H)-one,  
 5-[[(2,3-Difluorophenyl)methyl]thio]-7-[[(1R)-2-hydroxy-1-methylethyl]amino]thiazolo[4,5-d]pyrimidin-2(3H)-one,  
 5-[[(2,3-difluorophenyl)methyl]thio]-7-[[2-(hydroxyethoxy)ethyl]amino]thiazolo[4,5-d]pyrimidin-2(3H)-one,  
 5-[[(2,3-difluorophenyl)methyl]thio]-7-[[2-hydroxy-1-(hydroxymethyl)ethyl]amino]thiazolo[4,5-d]pyrimidin-2(3H)-one,  
 7-[(2-aminoethyl)amino]-5-[[(2,3-difluorophenyl)methyl]thio]thiazolo[4,5-d]pyrimidin-2(3H)-one,  
 5-[[(2,3-difluorophenyl)methyl]thio]-7-[(2-hydroxyethyl)amino]thiazolo[4,5-d]pyrimidin-2(3H)-one,  
 N-[2-[[5-[[(2,3-difluorophenyl)methyl]thio]-2,3-dihydro-2-oxothiazolo[4,5-d]pyrimidin-7-yl]amino]ethyl]methanesulfonamide,  
 (+/−)-5-[[(2,3-difluorophenyl)methyl]thio]-7-[[2-(2-hydroxyethoxy)-1-methylethyl]amino]thiazolo[4,5-d]pyrimidin-2(3H)-one,  
 7-[[(1R)-2-amino-1-methylethyl]amino]-5-[[(2,3-difluorophenyl)methyl]thio]thiazolo[4,5-d]pyrimidin-2(3H)-one,  
 5-[[(2,3-difluorophenyl)methyl]thio]-7-[[(1R)-2-[(2-hydroxyethyl)amino]-1-methylethyl]amino]thiazolo[4,5-d]pyrimidin-2(3H)-one,  
 5-[[(2,3-difluorophenyl)methyl]thio]-7-[[(1R)-2-(dimethylamino)-1-methylethyl]amino]thiazolo[4,5-d]pyrimidin-2(3H)-one,  
 5-[[[4-(2-aminoethoxy)-3-chlorophenyl]methyl]thio]-7-[[(1R)-2-hydroxy 1-methylethyl]amino]thiazolo[4,5-d]pyrimidin-2(3H)-one,  
 5-[[3-Chloro-4-methoxyphenyl)methyl]thio]-7-[[(1R)-2-hydroxy-1-methylethyl]amino]thiazolo[4,5-d]pyrimidin-2(3H)-one,  
 5-[[3-Chloro-2-fluorophenyl)methyl]thio]-7-[[(1R)-2-hydroxy-1-methylethyl]amino]thiazolo[4,5-d]pyrimidin-2(3H)-one,  
 5-[[(2,3-Difluorophenyl)methyl]thio]-7-[[(3R,4R)-4-hydroxypyrrolidin-3-yl]amino]-thiazolo[4,5-d]pyrimidin-2(3H)-one,  
 5-[[(2,3-Difluorophenyl)methyl]thio]-7-[(3R)-pyrrolidin-3-ylamino]thiazolo[4,5-d]pyrimidin-2(3H)-one,  
 7-[[(1R)-2-Hydroxy-1-methylethyl]amino]-5-[[(2-methyl-4-thiazolyl)methyl]thio]thiazolo[4,5-d]pyrimidin-2(3H)-one,  
 7-[[2-Hydroxy-1-(hydroxymethyl)ethyl]amino]-5-[[(2-methyl-4-thiazolyl)methyl]thio]thiazolo[4,5-d]pyrimidin-2(3H)-one,  
 7-[(2-Hydroxy-1,1-dimethylethyl)amino]-5-[[(2-methyl-4-thiazolyl)methyl]thio]thiazolo[4,5-d]pyrimidin-2(3H)-one,  
 7-[(2-Hydroxy-1,1-dimethylethyl)amino]-5-[[(2-methylphenyl)methyl)thio]thiazolo[4,5-d]pyrimidin-2(3H)-one,  
 5-[(2-Furanylmethyl)thio]-7-[[(1R)-2-hydroxy-1-methylethyl]amino]thiazolo[4,5-d]pyrimidin-2(3H)-one,  
 7-[[(1R)-2-Amino-1-methylethyl]amino]-5-[[(3-chloro-2-fluorophenyl)methyl]thio]thiazolo[4,5-d]pyrimidin-2(3H)-one  
 (2S)-2-[[5-[[(2,3-Difluorophenyl)methyl]thio]-2,3-dihydro-2-oxothiazolo[4,5-d]pyrimidin-7-yl]amino]-3-hydroxy-propanamide,  
 7-[[(1R)-2-hydroxy-1-methylethyl]amino]-5-[(2-thienylmethyl)thio]thiazolo[4,5-d]pyrimidin-2(3H)-one,  
 7-[[(1R)-2-hydroxy-1-methylethyl]amino]-5-[[[3-methyl-4-(methylsulfonyl)phenyl]methyl]thio]thiazolo[4,5-d]pyrimidin-2(3H)-one,  
 5-[[[3-chloro-4-(trifluoromethoxy)phenyl]methyl]thio]-7-[[(1R)-2-hydroxy-1-methylethyl]amino]thiazolo[4,5-d]pyrimidin-2(3H)-one,  
 5-[[[2-fluoro-3-(trifluoromethyl)phenyl]methyl]thio]-7-[[(1R)-2-hydroxy-1-methylethyl]amino]thiazolo[4,5-d]pyrimidin-2(3H)-one,  
 5-[[(2,3-difluorophenyl)methyl]thio]-7-[2-[(dimethylamino)ethyl]amino]thiazolo[4,5-d]pyrimidin-2(3H)-one,  
 5-[[(2-fluorophenyl)methyl]thio]-7-[[(1R)-2-hydroxy-1-methylethyl]amino]thiazolo[4,5-d]pyrimidin-2(3H)-one,  
 7-[[(1R)-2-hydroxy-1-methylethyl]amino]-5-[[(2-methoxyphenyl)methyl]thio]thiazolo[4,5-d]pyrimidin-2(3H)-one,  
 7-[[(1R)-2-hydroxy-1-methylethyl]amino]-5-[(2-phenoxyethyl)thio]thiazolo[4,5-d]pyrimidin-2(3H)-one,  
 7-[[(1R)-2-hydroxy-1-methylethyl]amino]-5-[[(3-methylphenyl)methyl]thio]thiazolo[4,5-d]pyrimidin-2(3H)-one,  
 5-[[(2-fluoro-3-methylphenyl)methyl]thio]-7-[[(1R)-2-hydroxy-1-methylethyl]amino]thiazolo[4,5-d]pyrimidin-2(3H)-one,  
 5-[[(3-chlorophenyl)methyl]thio]-7-[[(1R)-2-hydroxy-1-methylethyl]amino]thiazolo[4,5-d]pyrimidin-2(3H)-one,  
 5-[[(3-bromophenyl)methyl]thio]-7-[[(1R)-2-hydroxy-1-methylethyl]amino]thiazolo[4,5-d]pyrimidin-2(3H)-one,  
 5-[[[4-(difluoromethoxy)phenyl]methyl]thio]-7-[[(1R)-2-hydroxy-1-methylethyl]amino]thiazolo[4,5-d]pyrimidin-2(3H)-one,  
 (+/−)-5-[[(2,3-difluorophenyl)methyl]thio]-7-[[2-hydroxy-1-(methoxymethyl)ethyl]amino]thiazolo[4,5-d]pyrimidin-2(3H)-one,  
 7-[[2-hydroxy-1-(hydroxymethyl)ethyl]amino]-5-[(phenylmethyl)thio]thiazolo[4,5-d]pyrimidin-2(3H)-one,  
 5-[[(2-bromophenyl)methyl]thio]-7-[[(1R)-2-hydroxy-1-methylethyl]amino]thiazolo[4,5-d]pyrimidin-2(3H)-one,  
 5-[[(2,3-Difluorophenyl)methyl]thio]-7-[[(1R)-2-hydroxy-1-methylethyl]amino]thiazolo[4,5-d]pyrimidin-2(3H)-one,  
 5-[[3-Chloro-2-fluorophenyl)methyl]thio]-7-[[(1R)-2-hydroxy-1-methylethyl]amino]thiazolo[4,5-d]pyrimidin-2(3H)-one,  
 (+/−)-5-[[(2,3-difluorophenyl)methyl]thio]-7-[[2-hydroxy-1-(methoxymethyl)ethyl]amino]thiazolo[4,5-d]pyrimidin-2(3H)-one,  
 7-[[2-hydroxy-1-(hydroxymethyl)ethyl]amino]-5-[(phenylmethyl)thio]thiazolo[4,5-d]pyrimidin-2(3H)-one,  
 7-[[(1R)-2-Hydroxy-1-methylethyl]amino]-5-[(phenylmethyl)thio]thiazolo[4,5-d]pyrimidin-2(3h)-one,  
 5-[(5-chloro-1,2,3-thiadiazol-4-yl)thio]-7-[[(1R)-2-hydroxy-1-methylethyl]amino ]-thiazolo[4,5-d]pyrimidin-2(3H)-one,  
 and their pharmaceutically acceptable salts and solvates.  
 
     
     
         5 . A compound according to  claim 1  selected from: 
 5-[[(2,3-Difluorophenyl)methyl]thio]-7-[[(1R)-2-hydroxy-1-methylethyl]amino]thiazolo[4,5-d]pyrimidin-2(3H)-one sodium salt,  
 5-[[3-Chloro-2-fluorophenyl)methyl]thio]-7-[[(1R)-2-hydroxy-1-methylethyl]amino]thiazolo[4,5-d]pyrimidin-2(3H)-one sodium salt,  
 (+/−)-5-[[(2,3-difluorophenyl)methyl]thio]-7-[[2-hydroxy-1-(methoxymethyl)ethyl]amino]thiazolo[4,5-d]pyrimidin-2(3H)-one sodium salt,  
 7-[[2-hydroxy-1-(hydroxyethyl)ethyl]amino]-5-[(phenylmethyl)thio]thiazolo[4,5-d]pyrimidin-2(3h)-one sodium salt, or  
 7-[[(1R)-2-Hydroxy-1-methylethyl]amino]-5-[(phenylmethyl)thio]thiazolo[4,5-d]pyrimidin-2(3H)-one sodium salt.  
 
     
     
         6 . A compound according to  claim 1  selected from: 
 7-[[(1R)-2-amino-1-methylethyl]amino]-5-[[(2,3-difluorophenyl)methyl]thio]thiazolo[4,5-d]pyrimidin-2(3H)-one trifluoroacetate,  
 5-[[(2,3-difluorophenyl)methyl]thio]-7-[[(1R)-2-[(2-hydroxyethyl)amino]-1-methylethyl]amino]thiazolo[4,5-d]pyrimidin-2(3H)-one trifluoroacetate,  
 5-[[(2,3-difluorophenyl)methyl]thio]-7-[[(1R)-2-(dimethylamino)-1-methylethyl]amino]thiazolo[4,5-d]pyrimidin-2(3H)-one,  
 5-[[[4-(2-aminoethoxy)-3-chlorophenyl]methyl]thio]-7-[[(1R)-2-hydroxy-1-methylethyl]amino]thiazolo[4,5-d]pyrimidin-2(3H)-one trifluoroacetate,  
 5-[[(2,3-difluorophenyl)methyl]thio]-7-[2-[(dimethylamino)ethyl]amino]thiazolo[4,5-d]pyrimidin-2(3H)-one monohydrochloride, or  
 5-[[(2,3-Difluorophenyl)methyl]thio]-7-[(3R)-pyrrolidin-3-ylamino]thiazolo[4,5-d]pyrimidin-2(3H)-one dihydrochloride.  
 
     
     
         7 . A process for the preparation of a compound of formula (I) as defined in  claim 1  which comprises: 
 (a) treating a compound of formula (IIA):  
                     
 where R 1 , R 2  and R 3  are as defined in formula (I) with a thiol R 1 SH in the presence of a suitable base, or  
 (b) treatment of a compound of formula (IIB):  
                     
 where R 1 , R 2  and R 3  are as defined in formula (I) and X is a leaving group with a metal alkoxide, followed by treatment with an acid or base, and optionally after (a) or (b) forming a pharmaceutically acceptable salt.  
 
     
     
         8 . A compound of formula (IIA) or (IIB) as defined in  claim 7 .  
     
     
         9 . A compound of formula (IIIA):  
       
         
           
           
               
               
           
         
         where R 2  and R 3  are as defined in formula (I) and X is NH 2 .  
       
     
     
         10 . A pharmaceutical composition comprising a compound of formula (I), or a pharmaceutically acceptable salt or solvate thereof, as claimed in  claim 1 , in association with a pharmaceutically acceptable adjuvant, diluent or carrier.  
     
     
         11 . A process for the preparation of a pharmaceutical composition which comprises mixing a compound of formula (I), or a pharmaceutically acceptable salt or solvate thereof, as claimed in  claim 1 , with a pharmaceutically acceptable adjuvant, diluent or carrier.  
     
     
         12 - 13 . (Cancelled).  
     
     
         14 . A method of treating a chemokine mediated disease wherein the chemokine binds to one or more chemokine receptors, which comprises administering to a patient a therapeutically effective amount of a compound of formula (I), or a pharmaceutically acceptable salt or solvate thereof, as claimed in  claim 1 .  
     
     
         15 . A method according to  claim 14  in which the chemokine receptor belongs to the CXC chemokine receptor subfamily.  
     
     
         16 . A method according to  claim 14  in which the chemokine receptor is the CXCR2 receptor.  
     
     
         17 . A method of treating an inflammatory disease in a patient suffering from, or at risk of, said disease, which comprises administering to the patient a therapeutically effective amount of a compound of formula (I), or a pharmaceutically acceptable salt or solvate thereof, as claimed in  claim 1 .  
     
     
         18 . A method according to  claim 17 , wherein the disease is psoriasis, a disease in which angiogenesis is associated with raised CXCR2 chemokine levels, or COPD.  
     
     
         19 . A method according to  claim 15 , wherein the disease is psoriasis.