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Studies with Polyfunctionally Substituted Heterocycles: New Synthesis of Pyrido[5′,4′:2,3][1,3,4]oxadiazolo[3,2-a]pyridine; Pyridazine; 1,3,4-Oxadiazole; and Pyrazolo[1,5-a]Pyrimidine Derivatives
Barsy, Magda A.,Elmaghraby, Mohammed A.,Ahmed, Salwa M.
, p. 655 - 658 (2007/10/03)
Cyanoacetohydrazide 1a reacts with 2-arylhydrazoketons 2a,b and 3a,b in refluxing ethanol to yield pyrido[5′,4′:2,3][1,3,4]oxadiazolo[3,2-a]pyridine and pyridazine derivatives; in the absence of solvent pyrazolo[1,5-a]pyrimidine derivatives were obtained.
