Organocatalytic asymmetric Mannich-type reaction of N-sulfonylimines with isocyanoacetate leading to optically active 2-imidazoline-4-carboxylates
作者:Zhen-Wei Zhang、Gui Lu、Miao-Miao Chen、Ning Lin、Yong-Bo Li、Tamio Hayashi、Albert S.C. Chan
DOI:10.1016/j.tetasy.2010.04.029
日期:2010.7
The first asymmetric Mannich-type reaction of methyl isocyanoacetate with N-sulfonylimines catalyzed by cinchona alkaloid derivatives yielded 2-imidazolines with high diastereoselectivities and good enantioselectivities (up to >99:1 dr and 70% ee). This reaction provided a convenient route to access various substituted 2-imidazoline-4-carboxylates and related alpha,beta-diamino acids in high enantiomeric purities. (C) 2010 Elsevier Ltd. All rights reserved.