Inhibitors based on the benzimidazole scaffold showed subnanomolar potency
against Factor Xa with 500-1000-fold selectivity against thrombin and 50-10
0-fold selectivity against trypsin. The 2-substituent on the benzimidazole
ring had a strong impact on the FXa inhibitory activity. Crystallography st
udies suggest that the 2-substituent may have a conformational effect favor
ing the extended binding conformation. (C) 2000 Elsevier Science Ltd. All r
ights reserved.