In(III)‐Catalyzed O‐Annulation of Cyclic Diazodicarbonyls with 2‐Naphthol, 6‐Quinolinol, β‐Tetralone, and 9‐Phenanthrol to Access Diverse Benzochromones

In(III)‐Catalyzed O‐annulation of cyclic diazodicarbonyl compounds with 2‐naphthols, 6‐quinolinol, β‐tetralone, and 9‐phenanthrol is developed. This novel synthetic strategy paves a facile and desired access to diverse and functionalized benzochromones. This imperative protocol involves domino carbene generation, ketene formation through Wolff‐rearrangement, nucleophilic addition, H‐migration, intramolecular cyclization, and elimination of water. A facile synthetic pathway for the construction of diverse and functionalized benzochromones via In(III)‐catalyzed O‐annulation of cyclic diazodicarbonyls with 2‐naphthols, 6‐quinolinol, β‐tetralone, and 9‐phenanthrol is developed.