Catalytic Difunctionalization of Unactivated Alkenes with Unreactive Hexamethyldisilane through Regeneration of Silylium Ions
作者:Qian Wu、Avijit Roy、Elisabeth Irran、Zheng‐Wang Qu、Stefan Grimme、Hendrik F. T. Klare、Martin Oestreich
DOI:10.1002/anie.201911282
日期:2019.11.25
A metal-free, intermolecular syn-addition of hexamethyldisilane across simple alkenes is reported. The catalytic cycle is initiated and propagated by the transfer of a methyl group from the disilane to a silylium-ion-like intermediate, corresponding to the (re)generation of the silylium-ion catalyst. The key feature of the reaction sequence is the cleavage of the Si-Si bond in a 1,3-silyl shift from
报道了六甲基乙硅烷在简单烯烃上的无金属分子间顺加成。催化循环是通过甲基从乙硅烷转移到类硅离子中间体来启动和传播的,这对应于硅离子催化剂的(再生)。该反应序列的关键特征是 1,3-甲硅烷基从硅转移到碳时 Si-Si 键的断裂。通过X射线衍射对催化的中心中间体进行了结构表征,计算的反应机理与实验结果完全一致。