A new type of organocatalyst for highly stereoselective Michael addition of ketones to nitroolefins on water
作者:Siang-en Syu、Tzu-Ting Kao、Wenwei Lin
DOI:10.1016/j.tet.2009.11.093
日期:2010.1
prepared in three steps from (S)-N-Boc-2-[((4-toluenesulfonyl)oxy)methyl]pyrrolidine in 62% overall yield, was used as a new type of organocatalyst bearing a pyrrolidine and a sulfone moiety. It shows very high catalytic activity toward the direct asymmetric Michael reaction of cyclohexanone and nitroolefins. All the corresponding adducts can be furnished in 90–99% yields and with up to 98% ee and