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Paper | Regular issue | Vol 24, No. 6, 1986, pp.1631-1636
Published online, 1st January, 1970
DOI: 10.3987/R-1986-06-1631
Synthesis of Pyrano, Thiopyrano, and Pyrido[3,2-d]pyrazoles

Saoud A. Metwally,* Mansour I. Younes, and Amal M. Nour

*Chemistry Department, Faculty of Science, Assiut University, Assiut 71516, Egypt

Abstract

The title compounds pyrano[3,2-d]pyrazoles (3) were obtained by the action of polyphosphoric acid on the 3-methyl-4-(1-aryl-3-aryl-3-oxopropyl)-2-pyrazolin-5-one, after neutralisation with sodium bicarbonate. Interaction of phosphorous pentasulphide with the starting compounds (2) in dry xylene gives rise to thiopyrano[3,2-d]pyrazoles (4) but pyrido[3,2-d]pyrazoles (5) were obtained by the action of ammonium acetate on the compound (2) in the presence of glacial acetic acid.