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. © 1991.
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
VICENTINI, Chiara Beatrice;VERONESE, Augusto;GUARNERI, Mario;GIORI, Paolo
1991
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. © 1991.File in questo prodotto:
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