A New Silicon Lewis Acid for Highly Enantioselective Mannich Reactions of Aliphatic Ketone-Derived Hydrazones
作者:Gregory T. Notte、James L. Leighton
DOI:10.1021/ja800830h
日期:2008.5.1
The first general method for the highly enantioselective Mannich reaction of aliphatic ketimines is reported. A new, second generation chiral silane Lewis acid has been developed that promotes the reaction between ketone-derived hydrazones and silyl ketene acetals, providing the beta,beta-disubstituted beta-amino esters with good enantioselectivity even for the hydrazone derived from 2-butanone (methyl
报道了脂肪族酮亚胺的高度对映选择性曼尼希反应的第一种通用方法。已开发出一种新的第二代手性硅烷路易斯酸,可促进酮衍生腙和甲硅烷基乙烯酮缩醛之间的反应,即使对于衍生自 2-丁酮的腙,β,β-二取代 β-氨基酯也具有良好的对映选择性。甲基与乙基,91% ee)。提供了几个例子,包括与取代的(丙酸酯衍生的)甲硅烷基乙烯酮缩醛的反应。