Access to Chiral Seven-Member Cyclic Amines via Rh-Catalyzed Asymmetric Hydrogenation
作者:Pan Li、Yi Huang、Xinquan Hu、Xiu-Qin Dong、Xumu Zhang
DOI:10.1021/acs.orglett.7b01726
日期:2017.7.21
A highly efficient asymmetric hydrogenation of azepine/oxazepine-type seven-member cyclic imine hydrochlorides was successfully developed using Rh/bisphosphine-thiourea ligand ZhaoPhos, affording various chiral seven-member cyclic amines with full conversions, high yields, and excellent enantioselectivities (up to 96% yield, >99% ee). Additionally, this asymmetric hydrogenation can proceed well on
使用Rh /双膦-硫脲配体ZhaoPhos成功开发了高效的不对称氮杂/奥氮平型七元环亚胺盐酸盐加氢剂,可提供具有完全转化率,高收率和出色的对映选择性的多种手性七元环胺。 96%的收率,> 99%ee)。另外,这种不对称氢化可以以良好的ee值在克规模上进行得很好。而且,对照实验结果表明,底物的氯离子与ZhaoPhos的硫脲基序之间的阴离子键合相互作用对获得优异的对映选择性起着重要作用。