Access to Functionalized <i>E</i>-Allylsilanes and <i>E</i>-Alkenylsilanes through Visible-Light-Driven Radical Hydrosilylation of Mono- and Disubstituted Allenes
作者:Yanyao Cai、Wenxuan Zhao、Shaozhong Wang、Yong Liang、Zhu-Jun Yao
DOI:10.1021/acs.orglett.9b03679
日期:2019.12.20
visible-light-driven radical hydrosilylation of allene has been achieved by using eosin Y as the photocatalyst, with thiol and base as additives. Depending on allenes, two types of adducts with E-selectivity were obtained. It was demonstrated that monosubstituted nonarylated allenes reacted to give linear E-allylsilanes, while 1,3-disubstituted electron-deficient allenes afforded E-alkenylsilanes. A radical mechanism
通过使用曙红Y作为光催化剂,并使用硫醇和碱作为添加剂,实现了丙二烯的可见光驱动的自由基氢化硅烷化。取决于烯丙基,获得了两种具有E-选择性的加合物。结果表明,单取代的非芳基化烯可以反应生成线性的E-烯丙基硅烷,而1,3-二取代的缺电子电子烯则可以得到E-烯基硅烷。提出了一种自由基机理来解释这些官能化的含硅化合物的化学,区域和立体选择性形成。