Formal Hydrotrimethylsilylation of Styrenes with Anti-Markovnikov Selectivity Using Hexamethyldisilane
作者:Xin Wang、Zhi-Xiang Yu、Wen-Bo Liu
DOI:10.1021/acs.orglett.2c03170
日期:2022.12.9
A combination of CsF and hexamethyldisilane in DMSO enabling an anti-Markovnikov formal hydrotrimethylsilylation of styrenes is reported. Mechanistic investigations detail the reaction pathways, including in situ generation of a silyl anion, the addition of this silyl anion onto the alkene to form a carbanion, and this carbanion is then protonated by DMSO. The choice of the solvent to match its reactivity
据报道,CsF 和六甲基乙硅烷在 DMSO 中的组合能够实现苯乙烯的反马尔可夫尼科夫形式氢化三甲基硅烷化。机理研究详细说明了反应途径,包括原位生成甲硅烷基阴离子,将这种甲硅烷基阴离子加成到烯烃上形成负碳离子,然后该负碳离子被 DMSO 质子化。选择溶剂以匹配其与负碳离子和甲硅烷基阴离子的反应性是该反应成功的关键。