Synthesis of 2-arylchromeno[2,3,4,5-lmna]phenanthridines through a sequential multicomponent assembly, oxygenation and 6πe electrocyclization reactions

A single-step synthesis of 2-arylchromeno[2,3,4,5-lmna]phenanthridines is disclosed using a MCR and cascade reactions. Here, DMSO reacts for regioselective ‘O’ transposition and assists in situ 6πe electrocyclization and aromatization reactions.