| 摘要 |
A process for substantially enhancing the regio and stereoselective synthesis of 9-beta-anomeric nucleoside analogs is described. The introduction of the sugar moiety onto a 6-substituted purine base was preformed so that only the 9-beta-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'-beta-fluoro and 2',3'-dideoxy-2'-beta-fluoro purine nucleoside analogs in high yield without virtually any formation of the 7-positional isomers. The compounds are drugs or intermediates to drugs.
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