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
(S)-2-((萘-2-基磺酰基)甲基)吡咯烷,由(S)-N -Boc-2-[(((4-甲苯磺酰基)氧基)甲基]吡咯烷经三步制备,总收率为62%用作具有吡咯烷和砜部分的新型有机催化剂。它对环己酮和硝基烯烃的直接不对称迈克尔反应显示出很高的催化活性。在没有任何添加剂的情况下,在这种催化剂(15摩尔%)的存在下,所有相应的加合物都可以以90-99%的收率,高达98%ee和99:1 dr的水压提供。