A Mild and Effective Method to Synthesize Carbazolones by CuI/l-Proline-Catalyzed Intramolecular Arylation

Substituted carbazol-4-ones and 3,4-dihydrocyclo-pental indole-l-ones could be prepared in good yields via the intramolecular coupling reaction of N-2-iodoaryl enaminones in the presence of CUI/L-proline under mild reaction conditions.