在这项工作中,开发了一种新的活化N-杂环卡宾硼烷(NHC-硼烷)的方式,该方式是通过以沮丧的Lewis对方式通过路易斯酸B(C 6 F 5)3氢化物提取生成高反应性的两性离子物质。B(C 6 F 5)3的合适底物包括苯乙烯,β-甲基苯乙烯,苯乙烯和烷基烯烃等多种烯烃。催化硼氢化以高至高收率提供所需的产品。显着地,在某些情况下获得了优异的区域选择性。机理研究表明,在确定速率的步骤中可能涉及到B键的断裂。此外,还假定将NHC-硼阳离子亲电加成到烯烃中,并随后形成碳正离子。目前的工作为稳定硼烷加合物的活化提供了一种有前途的方法,这可能在将来引起一些有趣的转变。
Facile Borylation of Alkenes, Alkynes, Imines, Arenes and Heteroarenes with <i>N</i>‐Heterocyclic Carbene‐Boranes and a Heterogeneous Semiconductor Photocatalyst
作者:Fukai Xie、Zhan Mao、Dennis P. Curran、Hongliang Liang、Wen Dai
DOI:10.1002/anie.202306846
日期:2023.9.25
In this article, we describe a stable semiconductor material, ultrathin CdS nanosheets, can act as a heterogeneous visible-light photoredox catalyst to orchestrate oxidative and reductive interfacial electron transfers for borylation of assorted alkenes, alkynes, imines and aromatic rings with NHC-borane. The low-cost and easily prepared CdS catalyst can be recovered and reused for several runs with