The lithium Z-enolates derived from 2-alkoxyacetates and -acetamides undergo unusual syn-selective Michael addition to α,β-unsaturated carbonyl compounds, where the syn selectivity of the amide enolates is much higher than that of the ester enolates. Factors that influence the stereoselectivity are also discussed.
由 2-烷
氧基
乙酸盐和 -乙
酰胺衍生的 Z-
烯醇
锂对 α,β-不饱和羰基化合物进行不寻常的顺式选择性迈克尔加成,其中
酰胺烯醇化物的顺式选择性远高于
酯烯醇化物。还讨论了影响立体选择性的因素。