A palladium-catalyzed ring-expansion reaction of cyclobutanols with 2-haloanilines leading to benzazepines and quinolines
作者:Xiao-Qin Shen、Xiao-Wei Yan、Xing-Guo Zhang
DOI:10.1039/d1cc04395a
日期:——
A general synthesis of 2-aryl benzazepines has been developed through palladium-catalyzed ring-expansion reactions of cyclobutanols with 2-haloanilines; the further oxidative rearrangement reaction of benzazepines provided an efficient synthesis of 2-acyl quinolines. These transformations feature the efficient construction of six- and seven-membered N-containing heterocycles from easily obtained materials
marketed drugs. However, due to a lack of general asymmetric methodology, access to chiral substituted tetrahydro-1-, 2-, and 3-benzazepines remained limited. In the current work, we report the development of a general biocatalytic method using imine reductases (IREDs) for the synthesis of variously substituted chiral tetrahydro benzazepines. The reduction of seven-membered prochiral cyclic imines mainly