Visible Light-Driven Brønsted Acid-Catalyzed Annulation of Enaminones Enables Modular Access to Imidazo[1,2-a]azaarenes.
Imidazo[1,2-a]pyridines are privileged heterocyclic motifs in pharmaceuticals and functional materials, yet densely substituted azaarenyl-containing variants remain difficult to access. We report a visible-light-driven, Brønsted acid-catalyzed annulation of readily accessible N-(2-azaarenyl)enaminones. The reaction pro...