Well‐Defined, Versatile and Recyclable Half‐Sandwich Nickelacarborane Catalyst for Selective Carbene‐Transfer Reactions
作者:Linghua Wang、Saima Perveen、Yizhao Ouyang、Shuai Zhang、Jiao Jiao、Gang He、Yong Nie、Pengfei Li
DOI:10.1002/chem.202005014
日期:2021.3.26
accessible nickel(II)‐based complexes have been rarely used. Herein, an air‐stable nickel(II)‐carborane complex is reported as a well‐defined, versatile and recyclable catalyst for selective carbene transfer reactions with low catalyst loading under mild conditions. This catalyst is effective for several types of reactions including diastereoselective cyclopropanation, epoxidation, selective X−H insertions
卡宾催化转移反应构成了有机合成中一类非常有用的转变。尽管已经报道了基于多种过渡金属的催化剂,但很少使用容易获得的镍(II)基络合物。在本文中,据报道,一种空气稳定的镍(II)-碳硼烷络合物是一种定义明确,用途广泛且可回收的催化剂,用于在温和条件下以低催化剂负载量进行选择性卡宾转移反应。该催化剂可有效用于多种类型的反应,包括非对映选择性环丙烷化,环氧化,选择性XH插入(X = C,N,O,S,Si),特别是对于未保护的底物。这代表了贱金属催化中碳硼烷配体的罕见例子。