A process for substantially enhancing the regio and stereoselective synthesis of 9-β-anomeric nucleoside analogs is described. The introduction of the sugar moiety onto a 6-substituted purine base was preformed so that only the 9-β-D- or L-purine nucleoside analogs were obtained. This regio and stereoselective introduction of the sugar moiety allows the synthesis of nucleoside analogs and in particular 2'-deoxy, 3'-deoxy, 2'-deoxy-2'-β-fluoro and 2', 3'-dideoxy-2'-β-fluoro purine nucleoside analogs in high yield without virtually any formation of the 7-positional isomers. The compounds are drugs or intermediates to drugs.
本文描述了一种显著增强9-β-异构核苷类似物的区域和立体选择性合成的过程。将糖基引入到6-取代
嘌呤碱基上,以便只获得9-β-D-或L-
嘌呤核苷类似物。这种糖基的区域和立体选择性引入允许高产率地合成核苷类似物,特别是2'-去氧、3'-去氧、2'-去氧-2'-β-
氟和2'、3'-二去氧-2'-β-
氟嘌呤核苷类似物,几乎不形成7位异构体。这些化合物是药物或药物中间体。