摘要:
Representative examples of the title compounds including bicyclic analogs (7-9) in which a perhydro-1,3-oxazine is ortho-fused to the furanose ring, have been prepared in good to excellent yields. Compounds 5 and 7 showed marked activity against HIV-1 and HIV-2 replication in CEM cells (50% inhibitory concentration: 0.80-4.3 mu g/mL). Their di-O-acetylated (6) and mono-O-acetylated (8) derivatives were considerably less effective. To the best of our knowledge, these beta-D-threo anti-HIV nucleoside analogs constitute the first examples of anti-HIV active nucleosides bearing this configuration.