Asymmetric Hydrogenation of Cyclic Imines of Benzoazepines and Benzodiazepines with Chiral, Cationic Ruthenium-Diamine Catalysts
作者:Zhusheng Yang、Ziyuan Ding、Fei Chen、Yan-Mei He、Nianfa Yang、Qing-Hua Fan
DOI:10.1002/ejoc.201700236
日期:2017.4.10
The title hydrogenation reaction is achieved in the presence of phosphine‐free, chiral, cationic ruthenium–diamine complexes and provides facile access to various chiral seven‐membered N‐containing heterocycles. A reversal of enantioselectivity is observed simply by changing the achiral counteranion of the catalyst.