摘要:
BMS-200475, a novel carbocyclic analog of 2'-deoxyguanosine, is a potent inhibitor of hepatitis B virus in vitro (ED(50)=3 nM) with relatively low cytotoxicity (CC50=21-120 mu M). A practical 10-step asymmetric synthesis was developed affording BMS-200475 in 18% overall chemical yield and >99% optical purity. The enantiomer of EMS-200475 as well as the adenine, thymine, and iodouracil analogs are much less active. (C) 1997, Elsevier Science Ltd.