Organocatalytic asymmetric conjugate addition of α-substituted cyanoacetates to maleimides
作者:Jin-Jia Wang、Xue-Jiao Dong、Wen-Tao Wei、Ming Yan
DOI:10.1016/j.tetasy.2011.04.009
日期:2011.3
The asymmetric conjugateaddition of α-substitutedcyanoacetates to N-substituted maleimides has been developed. A number of cinchona alkaloids and amine thioureas were evaluated as catalysts. Takemoto’s catalyst was found to be the most efficient for the transformation. Chiral succinimides with two adjacent quaternary and tertiary stereogenic carbon centers were obtained in good yields, enantioselectivities
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