Chiral Vanadium(V)-catalyzed Oxidative Coupling of 4-Hydroxycarbazoles

Abstract
Enantioselective oxidative couplings of 4-hydroxycarbazoles using a chiral dinuclear vanadium(v) complex have been achieved for the first time. Under the mild reaction conditions, the corresponding dimeric 4-hydroxycarbazoles were obtained in up to 90% ee.