(E)- and (Z)-β-Borylallylsilanes by Alkyne Silaboration Followed by Regio- and Stereoselective Double-Bond Migration
作者:Toshimichi Ohmura、Kazuyuki Oshima、Michinori Suginome
DOI:10.1002/anie.201106077
日期:2011.12.23
Double take: β‐Borylallylsilanes have been synthesized by the regioselective silaboration of terminal alkynes followed by palladium‐catalyzed double‐bond migration of the resulting β‐borylalkenylsilanes (see scheme). The stereoselectivity of the double‐bond migration can be controlled by additives, thus leading to the stereocomplementary synthesis of (E)‐ and (Z)‐β‐borylallylsilanes.
双重考虑:通过末端炔基的区域选择性硅烷化,然后钯催化所得β-硼烷基烯基硅烷的双键迁移,合成了β-硼烷基烯丙基硅烷(参见方案)。双键迁移的立体选择性可以通过添加剂来控制,从而导致(E)-和(Z)-β-硼烷基烯丙基硅烷的立体互补合成。