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.