A Catalyst‐ and Metal‐free Approach towards the Synthesis of β‐Carboline tethered Imidazole Derivatives and Assessment of their Photophysical Properties

Abstract A simple, facile, and highly efficient approach has been unfolded for the syntheses of β ‐carboline tethered imidazole derivatives. This expeditious catalyst‐free strategy proceeds through the assembly of 1‐formyl‐9 H ‐ β ‐carbolines, glyoxal derivatives and ammonium acetate via the formation of concomitant four C−N bonds in a one‐pot operation. The current approach has various advantages, including multicomponent nature, simple reaction conditions, short reaction time, broad substrate scope, and high product yield. Importantly, the β ‐carboline tethered imidazole derivatives displayed excellent photophysical properties with quantum yield up to 90%.