Thiazolidine-based organocatalysts for a highly enantioselective direct aldol reaction
作者:Raoní S. Rambo、Paulo H. Schneider
DOI:10.1016/j.tetasy.2010.07.028
日期:2010.9
exhibits the highest catalytic performance working in an aqueous medium. It catalyzed the direct catalytic asymmetric intermolecular aldol reaction between unmodified ketones and an aldehyde with excellent stereocontrol and furnished the corresponding aldol products in up to 99% ee. Compound 3a also showed excellent asymmetric catalytic activity in the asymmetric Michael reaction (up to 99% ee).
一组对映体纯的基于噻唑烷的有机催化剂已经以直接的方式由l-半胱氨酸合成,允许多种结构变化。特别地,有机催化剂3a在水性介质中表现出最高的催化性能。它以优异的立体控制性能催化了未修饰的酮与醛之间的直接催化不对称分子间羟醛反应,并以高达99%ee的纯度提供了相应的羟醛产物。化合物3a在不对称迈克尔反应中也显示出出色的不对称催化活性(高达99%ee)。