The behaviour of the following reagents towards monovalent copper has been studied: 2.2'-dipyridyl, o-phenanthrolinc, 6.6'-dimothyl-2.2'-dipyridyl, a-pyridyl-2'-quinolyl.3'- methyl-pyridyl-2'-quinolyl. 2.2'-diquinolyl, 3'-methyl-2.2'-diquinolyl, 2-quinolyl-2'isoquinolyl. All these reagents give strongly coloured complexes with monovalent copper in alcoholic medium, the intensity of the colour varying
Highly Enantioselective Direct Synthesis of Endocyclic Vicinal Diamines through Chiral Ru(diamine)-Catalyzed Hydrogenation of 2,2′-Bisquinoline Derivatives
作者:Wenpeng Ma、Jianwei Zhang、Cong Xu、Fei Chen、Yan-Mei He、Qing-Hua Fan
DOI:10.1002/anie.201608181
日期:2016.10.4
An asymmetrichydrogenation of 2,2′‐bisquinoline and bisquinoxaline derivatives, catalyzed by chiral cationic ruthenium diamine complexes, was developed. A broad range of chiral endocyclic vicinal diamines were obtained in high yields with excellent diastereo‐ and enantioselectivity (up to 93:7 dl/meso and >99 % ee). These chiral diamines could be easily transformed into a new class of chiral N‐heterocyclic