Highly diastereoselective and enantioselective Michael addition of 5H-oxazol-4-ones to α,β-unsaturated ketones catalyzed by a new bifunctional organocatalyst with broad substrate scope and applicability
作者:Huicai Huang、Kailong Zhu、Wenbin Wu、Zhichao Jin、Jinxing Ye
DOI:10.1039/c1cc15928c
日期:——
A new thiourea-tertiary amine bifunctional catalyst derived from L-tert-leucine was developed and provides excellent stereocontrol in a novel and direct Michael addition of 5H-oxazol-4-ones to alpha,beta-unsaturated ketones with much broad substrate scope. The conjugate addition products with chiral vicinal quaternary and tertiary stereocenters can be easily transformed to structurally interesting
开发了一种新的衍生自L-叔亮氨酸的硫脲-叔胺双功能催化剂,并在新颖且直接的迈克尔将5H-恶唑-4-酮与具有广泛底物范围的α,β-不饱和酮进行迈克尔加成反应中提供了出色的立体控制。具有手性邻位四级和三级立体中心的共轭加成产物可以轻松转化为结构上令人感兴趣的化合物或结构单元。