Cyclic (Alkyl)(amino)carbene Ligands Enable Cu‐Catalyzed Markovnikov Protoboration and Protosilylation of Terminal Alkynes: A Versatile Portal to Functionalized Alkenes**
作者:Yang Gao、Sima Yazdani、Aaron Kendrick、Glen P. Junor、Taeho Kang、Douglas B. Grotjahn、Guy Bertrand、Rodolphe Jazzar、Keary M. Engle
DOI:10.1002/anie.202106107
日期:2021.9
donating cyclic (alkyl)(amino)carbene (CAAC) ligands. Using this method, both alkyl- and aryl-substituted alkynes are coupled with a variety of boryl and silyl reagents with high α-selectivity. The reaction is scalable, and the products are versatile intermediates that can participate in various downstream transformations. Preliminary mechanistic experiments shed light on the role of CAAC ligands in this
炔烃的区域选择性加氢官能化代表了获得硼酸烯基酯和硅烷结构单元的直接途径。在先前报道的催化系统中,高选择性是通过有限范围的底物和/或试剂实现的,缺乏通用解决方案。在这里,我们描述了一种选择性铜催化的末端炔烃的马尔科夫尼科夫加氢功能化,这是通过强烈提供环状 (烷基) (氨基) 卡宾 (CAAC) 配体来促进的。使用这种方法,烷基和芳基取代的炔烃都与各种具有高 α-选择性的硼基和甲硅烷基试剂偶联。该反应具有可扩展性,产物是多功能中间体,可以参与各种下游转化。初步的机械实验揭示了 CAAC 配体在这一过程中的作用。