Synthesis of 3,3-disubstituted oxindoles by one-pot integrated Brønsted base-catalyzed trichloroacetimidation of 3-hydroxyoxindoles and Brønsted acid-catalyzed nucleophilic substitution reaction
We developed a catalytic aerobic method to synthesize α,α-disubstituted α-amino acids through cross-dehydrogenativecoupling of azlactones. Combining an iron catalyst with a bisoxazolidine ligand resulted in high catalytic performance, and cross-coupling with an indole proceeded smoothly underaerobicconditions. A wide variety of α-aryl and aliphatic amino acid derived azlactones were applied to the