Asymmetric Aldol Reaction of 3-Acetyl-2<i>H</i>-chromen-2-ones and Isatins Catalyzed by a Bifunctional Quinidine Urea Catalyst
作者:Santhi Abbaraju、John Cong-Gui Zhao
DOI:10.1002/adsc.201300623
日期:2014.1.13
The asymmetric aldol reaction of 3‐acetyl‐2H‐chromen‐2‐ones and isatins has been realized by using a bifunctional quinidine‐derived urea as the catalyst. The corresponding 3‐hydroxyoxindole derivatives containing a 2H‐chromen‐2‐one moiety were obtained in good yields and high enantioselectivities. When (Z)‐ethyl 2‐benzylideneacetoacetate was used as the substrate, a mixture of two diastereomers (both
通过使用双功能奎尼丁衍生的尿素作为催化剂,实现了3-乙酰基-2 H-色烯-2-酮和靛红的不对称醛醇反应。以良好的产率和高对映选择性获得了相应的含有 2 H -chromen-2-one 部分的3-羟基羟吲哚衍生物。当 ( Z )-乙基 2-亚苄基乙酰乙酸乙酯用作底物时,由于双键在反应条件下异构化,得到两种非对映异构体(Z和E)的混合物。