Direct addition of glycine derivatives to enamines proceeded smoothly in the presence of a catalytic amount of a Lewis acid to afford the corresponding α,β-diamino acid derivatives in excellent yields. In this reaction, enamines would initially act as a base and subsequently as a C=N electrophile. This is the first example of Mannich-type reactions using enamines as imine equivalents.
在一定量的
路易斯酸催化下,甘
氨酸衍
生物与烯胺的直接加成反应进展顺利,并以极高的产率得到相应的 α,β-二
氨基酸衍
生物。在这一反应中,烯胺最初作为碱,随后作为 C=N 亲电体。这是利用烯胺作为
亚胺等价物进行曼尼希式反应的第一个实例。