Microwave-assisted synthesis of 4H-benzo[f]imidazo[1,4]diazepin-6-ones via a post-Ugi copper-catalyzed intramolecular Ullmann coupling

- An expedient intramolecular Ullmann coupling strategy to imidazobenzodiazepines.
- Commercially available building blocks and cheaper copper salt as catalyst were used.
- The diversity of the desired products is guaranteed by the Ugi-4CR.