Enantioselective Hydrogenation of Diarylmethanimines for Synthesis of Chiral Diarylmethylamines
作者:Duanyang Kong、Meina Li、Guofu Zi、Guohua Hou、Yong He
DOI:10.1021/acs.joc.6b01273
日期:2016.8.5
An enantioselectivehydrogenation of N-substituted diarylmethanimines under mild conditions has been first realized by using an iridiumcatalyst with a chiral f-spiroPhos ligand. This method provides an efficientaccess to the asymmetric synthesis of a variety of chiral diarylmethylamines and their derivatives with excellent enantioselectivities (up to 99.4% ee) and high turnover numbers (TON up to
Herein, we described a cooperative catalyst system consisting of an acridinium photoredox catalyst and a cobalt-based proton-reduction catalyst that is effective for the C-H amination of arenes with concomitant generation of hydrogen. This oxidant free method allows a variety of amines with diverse functional groups to be converted to aromatic amines. Additionally, this protocol can also be extended to hydrolytically unstable benzophenone imines.