作者:Jonathan H. Bailey、Andrew T. J. Byfield、Philip J. Davis、Alison C. Foster、Michael Leech、Mark G. Moloney、Matthias Müller、C. Keith Prout
DOI:10.1039/b000432o
日期:——
The diastereoselectivity in the alkylation of the enolates of bicyclic lactams 2 derived from pyroglutaminol 1a has been found to depend upon the nature of the hemiaminal ether protecting group. Although exo-alkylation has been widely reported for 2a,b,e, endo-alkylation is favoured for 2d. It is postulated that this is a result of the opening of the bicyclic structure of the enolate derived from 2d
双环烯醇烷基化的非对映选择性 内酰胺类 已发现衍生自焦谷氨酰胺1a的2取决于半胱氨酸醚的性质保护组。虽然外切烷基化已为被广泛报道2A,B,E,内烷基化是有利的为2D。据推测,这是由于源自2d的烯醇化物的双环结构开放,以及随之而来的立体电子促进面内攻击的结果。