The present invention provides benzothiazole compounds or benzothiophene compounds of Formula I having the structure: wherein X1, X2, X3, X4, X5, Y, WR2, R3, R4, R5, R6, R7 and AA and other moieties are as defined herein, or a stereoisomer, tautomer, pharmaceutically acceptable salt, prodrug ester or solvate form thereof. These compounds are inhibitors of platelet aggregation and thus can be used as medicaments for treating or preventing thromboembolic disorders.