Enantioselective organocatalytic aldol reaction of unactivated ketones with isatins
作者:Suresh Allu、Nagaraju Molleti、Ramachandrarao Panem、Vinod K. Singh
DOI:10.1016/j.tetlet.2011.05.013
日期:2011.8
Enantioselectiveorganocatalytic direct aldol reaction of unactivated ketones with various isatin derivatives was developed using cinchonine based urea ligand employing a noncovalent catalysis mechanism. Using this protocol we can access functionalized 3-alkyl-3-hydroxyindolin-2-ones in high yields with good to excellent enantioselectivities.
Enantioselective synthesis of 3-hydroxy oxindoles by ytterbium-catalysed decarboxylative addition of β-ketoacids to isatins
作者:Zhiqiang Duan、Jianlin Han、Ping Qian、Zirui Zhang、Yi Wang、Yi Pan
DOI:10.1039/c3ob41460d
日期:——
A ytterbium(III)-indapybox catalysed enantioselective decarboxylative addition reaction of β-ketoacids to isatins is described. The biologically important 3-hydroxy oxindoles were obtained in high yields and excellent enantioselectivities.