Nonpeptide glycoprotein IIb/IIIa inhibitors: Substituted quinazolinediones and quinazolinones as potent fibrinogen receptor antagonists

The synthesis and biological activity of a series of 3,6-substituted quinazolinediones and quinazolinones are described. The potent activity of these compounds as platelet aggregation inhibitors demonstrates the utility of these structures as central templates for nonpeptide RGD mimics.