Pd(II)‐Catalyzed Benzimidazole‐Assisted Annulation of 3‐(1H‐Benzo[d]imidazol‐2‐yl)‐2H‐chromen‐2‐one: Access to Imidazo[1,2‐a]chromeno[3,4‐c]pyridine

Abstract

AbstractPalladium‐catalyzed [4+2] oxidative annulation of coumarin‐benzimidazoles with olefins for the synthesis of polycyclic aromatic hydrocarbons have been achieved. This synthetic protocol gives access to a wide range of structurally distinct imidazo[1,2‐a]chromeno[3,4‐c]pyridines in moderate to good yield with wide functional group tolerance. Further, photophysical properties of annulated scaffolds have been examined, which discloses their interesting solvatochromic emission behaviors.