Stereocontrolled synthesis of C10-C22 fragment of the immunosuppressant FK 506. An occurrence of complementary stereoselectivity in the C15 ketone reduction
作者:Yoshiki Morimoto、Atsushi Mikami、Shin-itsu Kuwabe、Haruhisa Shirahama
DOI:10.1016/s0957-4166(96)00445-4
日期:1996.12
stereocontrolled ester-enolate Claisen rearrangement of ene-ester 5, and the aldehyde 4 which was prepared from D-mannitol via anti selective methallylsilane addition to aldehyde 6 followed by modest stereoselective hydroboration based on 1,3-asymmetric induction. In the course of this reaction sequence a complementary stereoselection dependent on the used hydride reagents has occurred in reduction of the coupling
免疫抑制剂FK 506 1的C10-C22片段2a及其C15-受体2b的立体选择性合成是通过砜3的会聚偶联完成的,该偶联可通过高度立体控制的烯酸酯的酯-烯酸酯克莱森重排来构建5和由D-甘露糖醇经反选择性甲基烯丙基硅烷加成醛6制备的醛4然后进行基于1,3-不对称诱导的适度立体选择性硼氢化反应。在该反应过程中,依赖于所用氢化物试剂的互补的立体选择发生在偶联产物26的还原中。