Chemoselective Carbophilic Addition of α-Diazoesters through Ligand-Controlled Gold Catalysis
作者:Yumeng Xi、Yijin Su、Zhaoyuan Yu、Boliang Dong、Edward J. McClain、Yu Lan、Xiaodong Shi
DOI:10.1002/anie.201404946
日期:2014.9.8
α‐aryldiazoesters was achieved through ligand‐controlled gold catalysis. Unlike a dirhodiumcatalyst (which promotes CH insertion and cyclopropanation) and a copper catalyst (which catalyzes OH and NH insertions), the gold catalyst with an electron‐deficient phosphite as the ancillary ligand exclusively gave the carbophilic addition product, thus representing a new and efficient approach to form “carbophilic
A carbene insertion into electron‐deficient C−H bonds of 1,3‐diesters, β‐ketoesters, β‐ketonitriles, and malononitriles was realized by using CuCN/PCy3 as the catalyst. The reaction provides a straightforward approach to the synthetically important multi‐substituted succinic acid derivatives. A plausible reaction mechanism with cyclopropanation/ring opening as key steps was proposed based on control