Silylated Pyrrolidines as Catalysts for Asymmetric Michael Additions of Aldehydes to Nitroolefins
作者:Ralph Husmann、Manuel Jörres、Gerhard Raabe、Carsten Bolm
DOI:10.1002/chem.201001764
日期:2010.11.8
Silicon can! A convenient synthesis of enantiopure (S)‐2‐(diphenylmethylsilyl)pyrrolidine is described and its organocatalytic activity in asymmetric Michael reactions is demonstrated (see scheme). By using 10 mol % of this novel organocatalyst, the addition of aldehydes to nitroolefins affords products with high stereoselectivities (d.r. ≤97:3 and e.r. ≤95:5) in yields up to 99 %.
硅罐!描述了对映纯(S)-2-(二苯基甲基甲硅烷基)吡咯烷的便捷合成方法,并证明了其在不对称Michael反应中的有机催化活性(参见方案)。通过使用10 mol%的这种新型有机催化剂,向硝基烯烃中添加醛可提供具有高立体选择性(dr≤97:3和er≤95:5)的产品,产率最高可达99%。