Recent Advances in Transition-Metal-Catalyzed Oxidative Annulations to Benzazepines and Benzodiazepines

Benzazepines and benzodiazepines, benzofused seven-membered N-heterocycles, compose an important family of natural products and pharmaceuticals. Although certainly important and effectives, classical synthetic methods of these cyclic compounds involve methodologies that often require multistep procedures, with generation of waste materials and lack of sustainability. By contrast, cycloadditions based on transition metal catalyzed C-H bond activations (oxidative annulations) have emerged as appealing strategies for more sustainable synthetic processes. In this review, we focus our attention to describe the state-of-the-art transition-metal-catalyzed annulationsviaC-H activations to benzazepines and benzodiazepines.