申请人:Ash Stevens, Inc.
公开号:US20040039190A1
公开(公告)日:2004-02-26
A process for substantially enhancing the regio and stereoselective synthesis of 9-&bgr;-anomeric nucleoside analogs is described. The introduction of the sugar moiety onto a 6-substituted purine base was preformed so that only the 9-&bgr;-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′-&bgr;-fluoro and 2′,3′-dideoxy-2′-&bgr;-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6-取代嘌呤碱基中,仅制备得到9-β-D-或L-嘌呤核苷类似物。这种区域和立体选择性引入糖基的方法允许高产率地合成核苷类似物,特别是2'-脱氧,3'-脱氧,2'-脱氧-2'-β-氟和2',3'-二脱氧-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。