Patent ID: 7662814

Claim:
A compound of formula (I): or a pharmaceutically acceptable salt thereof wherein R 1 and R 2 either (a) independently represent: (i) a hydrogen atom (ii) a group chosen from alkyl, alkenyl and alkynyl groups, wherein each alkyl, alkenyl and alkynyl group is independently and optionally substituted by one or more substituents chosen from halogen atoms, hydroxy, alkoxy, aryloxy, alkylthio, hydroxycarbonyl, alkoxycarbonyl, mono- and di-alkylaminoacyl, oxo, amino, and mono- and di-alkylamino groups; or (iii) a group of formula —(CH 2 ) n —R 6 wherein n is an integer from 0 to 4 and R 6 represents a cycloalkyl or cycloalkenyl group; or (b) R 1 and R 2 form, together with the nitrogen atom to which they are attached, a 3- to 8-membered ring comprising from 1 to 4 heteroatoms chosen from nitrogen, oxygen and sulphur, which ring is saturated or unsaturated and optionally substituted by one or more substituents chosen from halogen atoms, alkyl, hydroxy, alkoxy, acyl, hydroxycarbonyl, alkoxycarbonyl, alkylenedioxy, amino, mono- and di-alkylamino, mono- and di-alkylaminoacyl, nitro, cyano and trifluoromethyl groups; R 3 is a group of formula —(CH 2 ) n —G wherein n is an integer from 0 to 4 and G represents a monocyclic or bicyclic aryl or heteroaryl group comprising from one to four heteroatoms which group is optionally substituted by one or more substituents chosen from: (i) halogen atoms; (ii) alkyl groups, wherein each alkyl group is independently optionally substituted by one or more substituents chosen from halogen atoms; and (iii) phenyl, hydroxy, hydroxyalkyl, alkoxy, alkylenedioxy, aryloxy, alkylthio, amino, mono- and di-alkylamino, acylamino, nitro, acyl, hydroxycarbonyl, alkoxycarbonyl, cyano, difluoromethoxy and trifluoromethoxy groups; R 4 represents an alkyl or an aryl group; with the proviso that the compound of formula (I) is not 5-methyl-2-phenyl-4-morpholin-4-ylthieno[2,3-d]pyrimidine-6-carbonitrile.