Enantioselective Synthesis of a Key “A-Ring” Intermediate for the Preparation of 1α-Fluoro Vitamin D<sub>3</sub> Analogues
作者:Guy Giuffredi、Carla Bobbio、Véronique Gouverneur
DOI:10.1021/jo060516m
日期:2006.7.1
1α-Fluoro A-ring dienol 2, a useful building block for the preparation of fluorinated vitamin D3 analogues, was synthesized in eight steps from 4-[tert-butyldimethylsilyl]oxy}cyclohexanone. The most distinctive synthetic development to emerge from this new synthesis is an unprecedented substrate-controlled diastereoselective fluorodesilylation of an advanced dienylsilane intermediate. This is the
从4-[叔丁基二甲基甲硅烷基]氧基}环己酮分八步合成了1α-氟A环二烯醇2,这是一种用于制备氟化维生素D 3类似物的有用结构单元。从这种新合成中出现的最独特的合成进展是先进的二烯基硅烷中间体的前所未有的底物控制的非对映选择性氟代甲硅烷基化反应。这是依赖于使用亲电子氟化试剂的化合物2的第一个对映选择性路线。