Polycyclic N‐hetero compounds. XIX. Synthesis of novel meso‐ionic benz[h]imidazo[1,2‐c]quinazoline and benzo[h]pyrrolo[1′,2′:3,4]imidazo[1,2‐c]quinazoline derivatives

Benz[h]imidazo[1,2‐c]quinazolinium‐l‐olate 5 and benzo[h]pyrrolo[1′,2′:3,4]imidazo[1,2‐c]quinazolinium‐8‐olate 9 having novel meso‐ionic ring systems were synthesized by the reaction of N‐(5,6‐dihydrobenzo[h]‐quinazolin‐4‐yl)amino acids with acetic anhydride.