Polycyclic N-heterocyclic compounds. Part 86: Synthesis and evaluation of antiplatelet aggregation activity of 2,4-disubstituted 9-chloro-5,6-dihydropyrimido[5,4-d]benzazepine and related compounds

Libraries of tricyclic 2-substituted 4-alkylamino-9-chloro-5,6-dihydropyrimido[5,4-d]benzazepines and tetracyclic 12-substituted 8-chloro-1,2,5,6-tetrahydro-4H-imidazo[1',2':1,6]pyrimido[5,4-d]benzazepines were synthesized as part of our research to develop new effective antiplatelet drugs. Several alkyl and aryl groups were used as substituents at the 2-position. Evaluation of the effects of the newly synthesized compounds on collagen-induced platelet aggregation revealed several promising antiplatelet candidates with potencies superior to aspirin.