Copper-Catalyzed C–N Bond Formation/Rearrangement Sequence: Synthesis of 4H-3,1-Benzoxazin-4-ones

A facile and efficient copper-catalyzed method for the synthesis of 4H-3,1-benzoxazin-4-one derivatives has been developed. This procedure is based on a tandem intramolecular C-N coupling/rearrangement process. This method would provide a new and useful strategy for construction of N-heterocycles.