Organocatalytic Direct Asymmetric Vinylogous Michael Reaction of an α,β-Unsaturated γ-Butyrolactam with Enones
作者:Yong Zhang、Yong-Liang Shao、Hai-Sen Xu、Wei Wang
DOI:10.1021/jo102223v
日期:2011.3.4
An organocatalytic asymmetric directvinylogousMichaeladdition of α,β-unsaturated γ-butyrolactam to enones has been achieved with a simple bifunctional thiourea-tertiary amine catalyst, affording the γ-substituted butyrolactam products with high diastereo- and enantioselectivity (up to >40:1 dr and 94−99% ee).