Sugar-Based Pyrrolidine as a Highly Enantioselective Organocatalyst for Asymmetric Michael Addition of Ketones to Nitrostyrenes
作者:Lei Wang、Jie Liu、Tao Miao、Wei Zhou、Pinhua Li、Kai Ren、Xiuli Zhang
DOI:10.1002/adsc.201000162
日期:2010.10.4
A modular sugar-based pyrrolidine (3) was prepared and was found to be a highly enantioselective organocatalyst for the asymmetric Michael addition of ketones to nitrostyrenes. In the presence of 10 mol% of 3, a pyrrolidine unit anchored to a natural D-glucose backbone through click chemistry, the Michael additions of ketones to nitrostyrenes proceeded smoothly to generate the corresponding adducts
制备了模块化的基于糖的吡咯烷(3),发现其是用于酮向硝基苯乙烯的不对称迈克尔加成的高度对映选择性的有机催化剂。在10摩尔%的3(通过点击化学固定在天然D-葡萄糖主链上的吡咯烷单元)存在下,酮向硝基苯乙烯的迈克尔加成反应顺利进行,从而以高收率(最高98%)生成了相应的加合物在无溶剂的反应条件下,对映选择性(高达> 99%ee)和出色的非对映选择性(高达> 99:1 dr)。