Molybdenum‐Promoted Synthesis of Benzo[4,5]imidazo[1,2‐c]quinazolin‐6(5H)‐ones via Nitro Reduction and Ring Expansion

A simple and efficient method to construct benzo[4,5]imidazo[1,2‐ c ]quinazolin‐6(5 H )‐one skeleton was reported. A powerful functional group transformation strategy of −NO 2 transformed into −NH 2 was involved in this method. Only Mo(CO) 6 was used in the reaction, which acted as both reductant and cyclization accelerator. And a series of benzo[4,5]imidazo[1,2‐ c ]quinazolin‐6(5 H )‐one derivatives were obtained.