Ionic Liquid-Supported (ILS) (S)-Pyrrolidine Sulfonamide for Asymmetric Michael Addition Reactions of Aldehydes with Nitroolefins
作者:Emmy M. Omar、Kritanjali Dhungana、Allan D. Headley、Mohd Basyaruddin Abdul Rahman
DOI:10.2174/157017811795038395
日期:2011.3.1
supported (ILS) (S)-pyrrolidine sulfonamide organocatalyst (1c), which was developed earlier in our lab, has been applied to a wider range of Michael addition reaction, involving various aryl-substituted nitroolefins and a series of aldehydes. Catalyst 1c catalyzes Michael additions in which only 2 equivalents of aldehydes to each equivalent of nitroolefin are required. With 10 mol% of ILS catalyst
本实验室较早开发的一类离子液体负载型(ILS)(S)-吡咯烷磺酰胺有机催化剂(1c)已应用于更广泛的迈克尔加成反应,涉及各种芳基取代的硝基烯烃和一系列醛类。催化剂1c催化迈克尔加成,其中每当量硝基烯烃仅需要2当量醛。使用 10 mol% 的 ILS 催化剂 1c 负载,获得了中等至优异的产率(51-98%),具有中等对映选择性(28-83% ee)和高非对映选择性(syn/anti 比率高达 97/3)。此外,催化剂1c可以很容易地回收和重复使用至少5次,而活性略有降低。