Asymmetric Michael Addition of Cyclohexanone or Cyclopentanone to Chalcones Catalyzed by an<scp>L</scp>-Proline-Based Organic Phosphane
作者:Lingyan Liu、Yunna Zhu、Kaimeng Huang、Weixing Chang、Jing Li
DOI:10.1002/ejoc.201201609
日期:2013.5
An organophosphane catalyst derived from L-proline was shown to be a very effective catalyst for asymmetric Michael addition reactions of various chalcones to cyclic ketones including both cyclohexanone and cyclopentanone. The corresponding adducts could be obtained in high yields (up to 91 %) and with excellent enantioselectivities (up to 99 % ee) and diastereomeric ratios (up to >99:1). A possible
来自 L-脯氨酸的有机膦催化剂被证明是一种非常有效的催化剂,用于各种查耳酮与环酮(包括环己酮和环戊酮)的不对称迈克尔加成反应。相应的加合物可以以高产率(高达 91%)和出色的对映选择性(高达 99%ee)和非对映体比率(高达 >99:1)获得。已经提出了基于 31 P NMR 和 ESI-MS 观察的可能的催化机制,用于这种有机膦催化的迈克尔加成。