Asymmetric Hydrogenation of 2- and 2,3-Substituted Quinoxalines with Chiral Cationic Ruthenium Diamine Catalysts
作者:Jie Qin、Fei Chen、Ziyuan Ding、Yan-Mei He、Lijin Xu、Qing-Hua Fan
DOI:10.1021/ol2029096
日期:2011.12.16
The enantioselective hydrogenation of 2-alkyl- and 2-aryl-subsituted quinoxalines and 2,3-disubstituted quinoxalines was developed by using the cationic Ru(η6-cymene)(monosulfonylated diamine)(BArF) system in high yields with up to 99% ee. The counteranion was found to be critically important for the high enantioselectivity and/or diastereoselectivity.
的2-烷基-和2-芳基-喹喔啉替代内容和2,3-二取代的喹喔啉的对映选择性氢化是通过使用阳离子钌(η开发6 -cymene)(monosulfonylated二胺)(BARF)系统以高收率和多达99个%ee。发现抗衡阴离子对于高对映选择性和/或非对映选择性至关重要。