Pd-Catalyzed C(sp2)−H Imidoylative Annulation: a General Approach to Construct Dibenzoox(di)azepines

A general method to construct the scaffolds of dibenzooxazepine and dibenzodiazepine, through Pd-catalyzed isocyanide insertion and intramolecular C(sp2)–H activation, has been developed. This is the first example of seven-membered heterocycle formation by C–H imidoylative annulation.