Indium-Mediated Intramolecular Reaction of N-(2-Iodobenzoyl)azabenzonorbornadienes: A General Access to Dihydrobenzo[c]phenanthridinones.

An efficient synthesis of dihydrobenzo[c]phenanthridinones was achieved by utilizing an indium(0)-mediated intramolecular cyclization reaction under ligand- and base-free conditions. A variety of functional groups were tolerated in the present protocol.

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