Direct Mannich Reaction of Glycinate Schiff Bases with <i>N</i>-(8-Quinolyl)sulfonyl Imines: A Catalytic Asymmetric Approach to <i>anti</i>-α,β-Diamino Esters
作者:Jorge Hernández-Toribio、Ramón Gómez Arrayás、Juan C. Carretero
DOI:10.1021/ja807583n
日期:2008.12.3
An efficient catalytic enantioselective direct Mannich reaction of glycinate Schiff bases with aryl imines leading to anticonfigured orthogonally protected alpha,beta-diaminoesters has been realized. Keys to success in this new catalyst system are the use of Fesulphos/Cu(CH3CN)4PF6 (3-5 mol%) as a Lewis acid catalyst and readily available N-(8-quinolyl)sulfonyl-protected aldimines as substrates, affording
已经实现了甘氨酸席夫碱与芳基亚胺的高效催化对映选择性直接曼尼希反应,导致反构型正交保护的 α,β-二氨基酯。这种新催化剂系统成功的关键是使用 Fesulphos/Cu(CH3CN)4PF6 (3-5 mol%) 作为路易斯酸催化剂和容易获得的 N-(8-喹啉基)磺酰基保护的醛亚胺作为底物,提供优异的非对映体(通常是 anti/syn > 90:10)和对映体控制(通常 > 或 = 90% ee)的水平。这种催化剂体系的一个显着特点是它允许以高度非对映和对映控制的方式构建在 C-α 处具有四取代碳立体中心的产品。