Thiourea-catalyzed asymmetric conjugate addition of α-substituted cyanoacetates to maleimides
作者:Zhi-wei Ma、Ya Wu、Bin Sun、Hai-long Du、Wei-min Shi、Jing-chao Tao
DOI:10.1016/j.tetasy.2012.11.009
日期:2013.1
isosteviol-derived tertiary amine-thiourea was proven to be effective in catalyzing the asymmetric conjugateaddition between α-substitutedcyanoacetate and maleimides. Diverse succinimides bearing vicinal quaternary-tertiary stereocenters were obtained in excellent yields, excellent diastereoselectivities, and with good to high enantioselectivities. This catalytic system can be used efficiently in large-scale