Highly Regioselective Hydrosilylation of Unsymmetric Alkynes Using a Phenylthio Directing Group
作者:Kuan-Hsun Huang、Minoru Isobe
DOI:10.1002/ejoc.201402577
日期:2014.8
Cobalt-assisted hydrosilylation of acetylenes is particularly interesting in organic synthesis since alkynyl group functionalization can give way to more useful substructures. This study aims to answer the general question of how to control hydrosilylation regioselectivity with unsymmetric alkynyl groups. Cobalt-catalyzed hydrosilylation is highly regioselective with alkyl-phenylthio-acetylenes affording
乙炔的钴辅助氢化硅烷化在有机合成中特别有趣,因为炔基官能化可以让位于更有用的子结构。本研究旨在回答如何用不对称炔基控制氢化硅烷化区域选择性的一般问题。钴催化的氢化硅烷化对烷基苯硫基乙炔具有高度区域选择性,可提供相应的顺式-α-甲硅烷基-α-硫代芳基取代的烯烃。然而,在涉及具有相对较小烷基的底物的情况下,该反应失去区域选择性。该反应中的导向基团的作用是(i)对烷基施加空间效应,以及(ii)表达硫或氧原子的立体电子效应。