| abstract |
Compounds of formula (I) and their salts and solvates wherein: one of Y1 or Y2 represents N and the other represents NR5, O or S, or one of Y1 or Y2 represents S and the other represents CR5, wherein R5 represents hydrogen or C1-4 alkyl; m represents 0, 1 or 2; A represents C0-2 alkylene which may be optionally substituted with one or more groups independently selected from C1-6 alkyl, C2-6 alkenyl, C2-6 alkynyl, C1-6 haloalkyl, C3-7 cycloalkyl, C3-7 cycloalkylC1-4 alkyl, aryl, arylC1-4 alkyl, arylC3-7 cycloalkyl, heteroaryl, heteroarylC1-4 alkyl, R6SO2NR2C1-4 alkyl, R6CONR2C1-4 alkyl, R6OCONR2C1-4 alkyl, R2R7NCONR2C1-4 alkyl, R6SO2C1-4 alkyl, R2R7NSO2C1-4 alkyl, R2R7NCOC1-4 alkyl, R6COC1-4 alkyl, R7OOCC1-4 alkyl, R6OC1-4 alkyl, R2R7NC1-4 alkyl, R8OOC-, or R2R7NCO-; R2 represents independently hydrogen or C1-4 alkyl; B represents carboxy or a metabolically labile ester or amide thereof; R4 represents a group of formula (i) or (ii): wherein the terminal ring in both groups can be optionally substituted with one or more C1-4 alkyl or halogen groups and wherein R1 and R3, as defined in the description, are platelet aggregation inhibitors and are useful for the treatment or prevention of thromboembolic disorders. Pharmaceutical compositions including these compounds and processes for their preparation are also provided. |