… Heterocycles: New Synthesis of Pyrido [5′, 4′: 2, 3][1, 3, 4] oxadiazolo [3, 2??a] pyridine; Pyridazine; 1, 3, 4??Oxadiazote; and Pyrazolo [1, 5??a] Pyrimidine Derivatives

…, MA Elmaghraby, SM Ahmed

Index: Barsy, Magda A.; Elmaghraby, Mohammed A.; Ahmed, Salwa M. Journal of the Chinese Chemical Society, 1998 , vol. 45, # 5 p. 655 - 658

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Citation Number: 8

Abstract

Abstract 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. The reaction of 2a, b and 3a, b will) benzoylhydrazine afforded 1, 3, 4- oxadiazole and pyrazole derivatives.