Direct asymmetric aldol addition–isomerization of α,β-unsaturated γ-butyrolactam with aryl α-ketoesters: synthesis of MBH-type products
作者:Jinlong Zhang、Xihong Liu、Xiaojuan Ma、Rui Wang
DOI:10.1039/c3cc40717a
日期:——
A highly efficient direct asymmetric aldol additionâisomerization reaction at the α-position of α,β-unsaturated γ-butyrolactam and aryl α-ketoesters by using a bifunctional thiourea catalyst was achieved. MoritaâBaylisâHillman type adducts containing a quaternary stereocenter can be obtained in high yields and with excellent enantioselectivities (up to 99% ee).
通过使用双功能的硫脲催化剂,成功实现了α-不饱和γ-丁内酰胺和芳基α-酮酯在α位的高效直接不对称醇脱水–异构化反应。可以以高产率和优异的对映选择性(高达99% ee)获得具有四面体手性中心的Morita–Baylis–Hillman类型加合物。