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 conjugate addition between α-substituted cyanoacetate 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
已证明手性异戊四醇衍生的叔胺-硫脲可有效催化α-取代的氰基乙酸酯和马来酰亚胺之间的不对称共轭加成。以优异的产率,优异的非对映选择性以及良好至高对映选择性获得了具有邻位的四级-三级立体中心的不同的琥珀酰亚胺。该催化体系可以有效地用于大规模反应,并且产率和立体选择性保持在相同水平。