Asymmetric Ruthenium-Catalyzed Hydrogenation of 2- and 2,9-Substituted 1,10-Phenanthrolines
作者:Tianli Wang、Fei Chen、Jie Qin、Yan-Mei He、Qing-Hua Fan
DOI:10.1002/anie.201301830
日期:2013.7.8
Brønsted Acid Catalyzed Asymmetric Reduction of 2- and 2,9-Substituted 1,10-Phenanthrolines<b />
作者:Costa Metallinos、Fred Barrett、Shufen Xu
DOI:10.1055/s-2008-1032103
日期:——
Several 2- and 2,9-substituted1,10-phenanthrolines are reduced asymmetrically for the first time using a Hantzsch dihydropyridine in the presence of BINOL-derived phosphoric acid catalysts. The best results are obtained with phenanthrolines bearing unbranched or nitrogen-containing alkyl groups in the 2- or 2,9-positions, which afford chiral octahydrophenanthrolines in a range of yields (40-88%) and