Technical Note:
1.Nucleophilic Substitution: Catalyst for the nucleophilic substitution involving 3-hydroxyoxindoles giving 3,3'-disubstituted oxindoles with concomitant generation of an all-carbon quaternary stereogenic center in high yield and excellent enantioselectivity.
Reference:
1.Angew. Chem. Int. Ed., 2012, 51, 1046-1050.