Towards the synthesis of the C37-C42 fragment of rapamycin: intramolecular reactions of allyl silanes with oxonium ions generated from α-alkoxy sulfones.
作者:Steven V. Ley、Cyrille Kouklovsky
DOI:10.1016/s0040-4020(01)80798-5
日期:1994.1
A new method for the formation of methylene cyclohexane derivatives has been developed, using intramolecular trapping by allyl silanes of oxonium ions generated from α-alkoxysulfones. These acyclic precursors were prepared by quenching the anion of methoxymethyl phenyl sulfone 2 with various electrophiles containing the allyl silane moiety. When a β-substituent is present, the stereochemical outcome
已经开发出一种形成亚甲基环己烷衍生物的新方法,该方法利用烯丙基硅烷分子内捕获由α-烷氧基砜产生的氧离子进行分子内捕获。这些无环前体是通过用各种含有烯丙基硅烷部分的亲电试剂淬灭甲氧基甲基苯基砜2的阴离子而制备的。当存在β-取代基时,已证明环化反应的立体化学结果取决于起始原料的立体化学。该方法已应用于1的合成,雷帕霉素C 37 -C 42片段的合成前体。