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Paper | Regular issue | Vol 32, No. 4, 1991, pp.727-734
Published online, 1st January, 1970
DOI: 10.3987/COM-91-5677
Synthesis of N-Alkyl-N’-(4-diazo-5-pyrazolyl)ureas and Their Conversion into Pyrazolo[3,4-d][1,2,3]triazole and Pyrazolo[3,4-d]oxazole Derivatives

Chiara B. Vicentini, Augusto C. Veronese, Tiziana Poli, Mario Guarneri, and Paolo Giori*

*Dipartimento di Scienze Farmaceutiche, Università di Ferrara, via Fossato di Mortara 17, I-44100, Ferrara, Italy

Abstract

The synthetic route to N-alkyl-N’-(4-diazo-5-pyrazolyl)ureas (4) starting from pyrazolo[4,3-c][1,2,5]oxadiazin-3(5H)-one (1) is described. Compounds (4) undergo thermal and photochemical reactions affording pyrazolo[3,4-d][1,2,3]triazoles (5) and pyrazolo[3,4-d]oxazoles (7) respectively.