One-Pot Palladium-Catalyzed Synthesis of Benzo[b]carbazolediones

A palladium-catalyzed one-pot reaction for the synthesis of benzo[ b ]carbazolediones is described which proceeds by amination of 2,3-dibromonaphthoquinone, Suzuki cross-coupling with (2-bromo­phenyl)boronic acid, and subsequent intramolecular C–N Buchwald–Hartwig cyclization with amines.