Synthesis of new stable arylthiopyridinium N-arylimide zwitterions. Part 20: Fused azolium salts

3-Aryltetrazolopyridinium salts react with thiophenolates to afford stable arylthio substituted pyridinium N-arylimide zwitterions as red crystals. The angularly fused tetrazolo[1,5-a]quinolinium salt react analogously and also yielded a blue zwitterionic product. The new zwitterions underwent solvolysis in methanol to give N-anilinopyridones, their alkylation yielding stable N-alkyl substituted salts and their reaction with dipolarophiles results in the formation of stable cycloadducts.