Cooperative and Enantioselective NbCl5/Primary Amine Catalyzed Biginelli Reaction
作者:Yong-Feng Cai、Hua-Meng Yang、Li Li、Ke-Zhi Jiang、Guo-Qiao Lai、Jian-Xiong Jiang、Li-Wen Xu
DOI:10.1002/ejoc.201000894
日期:2010.9
evaluated in the Lewis acid/organocatalysts-based cooperative catalytic Biginelli reaction, which resulted in the determination of a novel cooperative Lewis acid/primary amine catalyst system, NbCl5/QN-NH2. The synergistic effect of NbCl5 and the quinine-derived primary amine is pronounced and gave dihydropyrimidiones (DHPMs) in moderate to good enantioselectivities (up to 84 % ee) and good to excellent yields
在基于路易斯酸/有机催化剂的协同催化 Biginelli 反应中评估了一系列手性有机催化剂和路易斯酸,从而确定了一种新型的路易斯酸/伯胺协同催化剂体系 NbCl5/QN-NH2。NbCl5 和奎宁衍生的伯胺的协同作用是显着的,在温和的条件下以中等至良好的对映选择性(高达 84% ee)和良好至极好的产率(产率高达 99%)得到二氢嘧啶酮 (DHPM)。