Catalytic asymmetric synthesis of 3-hydroxyl-2-oxindoles via enantioselective Morita–Baylis–Hillman reaction of isatins
作者:Ci-Ci Wang、Xin-Yan Wu
DOI:10.1016/j.tet.2011.02.045
日期:2011.4
The enantioselectiveMorita–Baylis–Hillmanreaction of acrylates to isatins was investigated for the first time, employing bifunctional phosphinothiourea organocatalysts based on chiral cyclohexane scaffold. The 3-hydroxyl-2-oxindole derivatives were obtained in excellent yields with moderate enantioselectivity (up to 69% ee) in the presence of 10 mol % catalyst 1b.
Catalytic Asymmetric Synthesis of Axially Chiral 3,3'‐Bisindoles by Direct Coupling of Indole Rings
作者:Feng‐Tao Sheng、Shuang Yang、Shu‐Fang Wu、Yu‐Chen Zhang、Feng Shi
DOI:10.1002/cjoc.202200327
日期:2022.9.15
overall excellent yields (up to 98%) with high enantioselectivities (up to 96 : 4 er). This approach not only has overcome the challenges in constructing axially chiral five-five-membered heterobiaryls, but also represents a new application of the C3-umpolung reactivity of 2-indolylmethanols in asymmetriccatalysis. More importantly, this class of axially chiral 3,3'-bisindoles can undergo a variety of