Nickel‐Catalyzed Allylic Alkylation with Diarylmethane Pronucleophiles: Reaction Development and Mechanistic Insights
作者:Sheng‐Chun Sha、Hui Jiang、Jianyou Mao、Ana Bellomo、Soo A. Jeong、Patrick J. Walsh
DOI:10.1002/anie.201507494
日期:2016.1.18
Palladium‐catalyzed allylic substitution reactions are among the most efficient methods to construct C−C bonds between sp3‐hybridized carbon atoms. In contrast, much less work has been done with nickel catalysts, perhaps because of the different mechanisms of the allylic substitution reactions. Palladium catalysts generally undergo substitution by a “soft”‐nucleophile pathway, wherein the nucleophile attacks
钯催化的烯丙基取代反应是在sp 3杂化碳原子之间构建C-C键的最有效方法之一。相反,可能由于烯丙基取代反应的机理不同,镍催化剂的工作量就少得多。钯催化剂通常通过“软”亲核途径进行取代,其中亲核体从外部攻击烯丙基。镍催化剂通常与“硬”亲核试剂配对,这些亲核试剂会在C-C键形成之前腐蚀金属。本文介绍的是一种稀有的镍基催化剂,可通过软亲核途径促进二芳基甲烷亲核体的取代。对不对称烯丙基烷基化的初步研究是有希望的。