Highly Enantioselective Michael Addition of Ketones to Nitroolefins with a Pyrrolidine-Based Phthalimide as an Enamine-Type Organocatalyst
作者:Shu-rong Ban、Hong-yu Xie、Xi-xia Zhu、Qing-shan Li
DOI:10.1002/ejoc.201101093
日期:2011.11
new type of pyrrolidine-based phthalimide and otheranalogous imide catalysts 5a–c were found to be efficient organocatalysts for the asymmetric Michael reaction of ketones to nitroalkenes. After fine optimization of solvents, temperature, and the additive, good to excellent enantioselectivities and diastereoselectivities (up to 99 % ee, up to >99:1 dr) can be achieved.
发现一种新型的基于吡咯烷的邻苯二甲酰亚胺和其他类似的酰亚胺催化剂 5a-c 是酮不对称迈克尔反应生成硝基烯烃的有效有机催化剂。在对溶剂、温度和添加剂进行精细优化后,可以获得良好到出色的对映选择性和非对映选择性(高达 99% ee,高达 >99:1 dr)。