Highly Enantioselective Lewis Base Organocatalyzed Hydrosilylation of γ-Imino Esters
作者:Zhou-Yang Xue、Li-Xin Liu、Yan Jiang、Wei-Cheng Yuan、Xiao-Mei Zhang
DOI:10.1002/ejoc.201101268
日期:2012.1
Highly enantioselective hydrosilylation of γ-imino esters with trichlorosilane promoted by a chiral Lewis base proceeded smoothly to provide various optically active γ-amino esters in good yields (up to 96 %) with excellent enantioselectivities (up to 99 % ee) at –10 °C in Cl2CHCHCl2. The side reactions were successfully reduced by rational modification of the substrate. The absolute configuration
在手性路易斯碱的促进下,γ-亚氨基酯与三氯硅烷的高度对映选择性氢化硅烷化顺利进行,以良好的产率(高达 96 %)提供各种光学活性 γ-氨基酯,在 –10 ° 时具有出色的对映选择性(高达 99 % ee) C 在 Cl2CHCl2 中。通过对底物进行合理修饰,成功减少了副反应。确定了 γ-氨基酯之一的绝对构型。最后,由两种γ-氨基酯合成了两种药学上有趣的对映体富集的γ-内酰胺。