Ring-Closing Metathesis of Allylsilanes/Electrophilic Desilylation To Prepare <i>exo</i>-Methylidenecycloalkanes. Short Syntheses of Teucladiol and Poitediol
作者:Matthew S. Dowling、Christopher D. Vanderwal
DOI:10.1021/ja906241w
日期:2009.10.28
A general strategy for the synthesis of exo-methylidenecycloalkanes, which are salient features of many terpenoid natural products, is presented. Ring-closing alkene metathesis of allylsilanes provides intermediates that can be protodesilylated with alkene transposition to afford the exocyclic alkene; alternatively, the reactivity of the cyclic allylsilane intermediate can be harnessed to introduce
介绍了合成外亚甲基环烷烃的一般策略,这是许多萜类天然产物的显着特征。烯丙基硅烷的闭环烯烃复分解反应提供了中间体,这些中间体可以通过烯烃转位进行原脱甲硅烷化,得到环外烯烃;或者,可以利用环状烯丙基硅烷中间体的反应性来引入烯丙基官能团。这两种反应模式分别在倍半萜烯天然产物 teucladiol 和 poitediol 的短合成中展示。