Development of a Radical Silylzincation of (Het)Aryl‐Substituted Alkynes and Computational Insights into the Origin of the
<i>trans</i>
‐Stereoselectivity
作者:Elise Romain、Karen Vega‐Hernández、Frédéric Guégan、Juan Sanz García、Carolin Fopp、Fabrice Chemla、Franck Ferreira、Hélène Gerard、Olivier Jackowski、Stéphanie Halbert、Martin Oestreich、Alejandro Perez‐Luna
DOI:10.1002/adsc.202001566
日期:2021.5.18
Aryl- and hetaryl-substituted acetylenes undergo regio- and stereoselective silylzincation by reaction with [(Me3Si)3Si]2Zn in the presence of Et2Zn (10–110 mol%) as additive. The distinctive feature of this addition across the C−C triple bond is its trans stereoselectivity. The radical nature of the silylzincation process is supported by diagnostic experiments and DFT calculations, which also corroborate
在有Et 2 Zn(10-110 mol%)作为添加剂的情况下,芳基和杂芳基取代的乙炔通过与[(Me 3 Si)3 Si] 2 Zn反应进行区域和立体选择性的甲硅烷基锌化反应。跨CC三键的这种加成的独特特征是其反式立体选择性。甲硅烷基锌化过程的根本性质得到诊断实验和DFT计算的支持,这也证实了空间效应在获得立体选择性中所起的作用。该程序可以与铜(I)介导的C(sp 2介电亲电取代)一锅结合)-Zn键,保留双键的几何形状。这对于合成立体定义的二取代和三取代的乙烯基硅烷具有重要意义。