Michael additions in water of ketones to nitroolefins catalyzed by readily tunable and bifunctional pyrrolidine–thiourea organocatalysts
作者:Yi-Ju Cao、Yuan-Yuan Lai、Xiang Wang、Yong-Jian Li、Wen-Jing Xiao
DOI:10.1016/j.tetlet.2006.11.037
日期:2007.1
An operationally trivial and environmentally benign procedure for direct Michael addition has been developed. The reaction of various ketones with nitroolefins can be performed in water to afford the corresponding nitro compounds in high yields in the presence of a pyrrolidine–thiourea organocatalyst at 35 °C. The reaction exhibits a high stereoselectivity, with high enantioselectivities (up to 99%)
已经开发了直接添加迈克尔的操作上琐碎且对环境有益的程序。各种酮类与硝基烯烃的反应可以在35°C的吡咯烷-硫脲有机催化剂存在下,在水中进行,以高产率提供相应的硝基化合物。该反应表现出高的立体选择性,在最佳条件下具有高的对映选择性(高达99%)以及非对映选择性(高达99:1)。