Simple inorganic base promoted C–N and C–C formation: synthesis of benzo[4,5]imidazo[1,2-a]pyridines as functional AIEgens used for detecting picric acid

Metal-free catalyzed intermolecular tandem Michael addition/cyclization is developed for the synthesis of benzo[4,5]imidazo[1,2- a ]pyridines from α-bromocinnamaldehyde. The RIM of the benzene ring at the C1-position makes them a new class of AIE molecules.