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.