γ-Silylated α,β-unsaturated amides. Formation by [1,5] silicon migration from O-silylated vinyl ketene aminals and fluoride- and Lewis acid-mediated aldol condensations
作者:J.R. Green、M. Majewski、B.I. Alo、V. Snieckus
DOI:10.1016/s0040-4039(00)84033-2
日期:1986.1
O-Silylated vinyl ketene aminal 2, obtained from lithiated unsaturated amide 1, undergoes a thermal [1,5] silicon migration to give γ-silylated product 3b which participates in fluoride- and titanium tetrachloride-mediated aldol condensations to give adducts 5 in poor and excellent syn diastereoselectivity respectively.
从锂化不饱和酰胺1中获得的O-甲硅烷基乙烯酮缩醛缩醛2经过热[1,5]硅迁移,得到γ-甲硅烷基化产物3b,该产物参与氟化物和四氯化钛介导的羟醛缩合,生成加合物5较差和优异的合成分别非对映选择性。