Synthesis of derivatives of tetrazolo[1,5-a]- and oxazolo[4,5-b]pyrano(thiopyrano)[3,4-c]pyridines
Tetrazolo[1,5-a]- and oxazolo[4,5-b]pyrano(thiopyrano)[3,4-c]pyridines, which are new heterocyclic systems, have been synthesized from pyrano[3,4-c]pyridine derivatives.