Patent ID: 8278345

Claim:
A compound of formula (I) or a pharmaceutically acceptable salt, tautomer or stereoisomer thereof, wherein: R 1 represents heteroaryl, -carbocyclyl-heteroaryl, -alkenylheteroaryl or -alkylheteroaryl, wherein the heteroaryl of the alkylheteroaryl may be optionally substituted by one or more groups selected from alkyl, alkoxy- and halogen; R 2 represents hydrogen; halogen; alkenyl; alkynyl; -alkenylaryl; -alkenylheteroaryl; alkyl, which may optionally be substituted by one or more groups selected from halogen, haloalkyl, hydroxyl, alkoxy-, -thioalkyl, —C(O)OH and —C(O)O-alkyl; carbocyclyl, which may optionally be substituted by one or more groups selected from alkyl, halogen, hydroxyl, alkoxy-, -thioalkyl, —C(O)OH and —C(O)O-alkyl; -alkylcarbocyclyl; -alkylheterocyclyl; aryl; heteroaryl; heterocyclyl optionally substituted by one or more alkyl groups; -alkylaryl; -alkyl(aryl) 2 ; -alkylheteroaryl; -aryl-heteroaryl; heterocyclyl-aryl-; -aryl-aryl; -heteroaryl-aryl; -heteroaryl-heteroaryl; or —C(O)R 4 ; R 3 represents halogen; alkyl optionally substituted by one or more groups selected from halogen, hydroxyl, alkoxy, thioalkyl, —C(O)OH and —C(O)O-alkyl; aryl; heteroaryl; or —C(O)R 5 ; R 4 represents alkyl, aryl, heteroaryl, -alkylaryl, -alkylheteroaryl, carbocyclyl, heterocyclyl, -alkylcarbocyclyl or -alkylheterocyclyl; and R 5 represents C 2-4 alkyl, heteroaryl, -alkylaryl, -alkylheteroaryl, carbocyclyl, heterocyclyl, -alkylcarbocyclyl or -alkylheterocyclyl; with the proviso that, when R 1 is imidazolyl, -carbocyclyl-imidazolyl, -alkenyl-imidazolyl or -alkyl-imidazolyl, then R 3 is not —C(O)R 5 .