Abstract
By coupling diazonium salts with 3-ethoxycarbonylamino-1-phenyl-5-pyrazolone a series of arylhydrazones (1) was prepared. These substances were thermally cyclized into 2H-2-aryl-6-phenyl-3,4,6,7-tetrahydropyrazolo[3,4-e]1,2,4-triazine-3,7-diones or into their corresponding 2,3,6,7-tetrahydro-5H-tautomers (2).
Zusammenfassung
Durch Kupplung von Diazoniumsalzen mit 3-Äthoxycarbonylamino-1-phenyl-5-pyrazolon wurden einige entsprechende Hydrazone (1) hergestellt. Durch thermische Cyclisierung wurden diese Substanzen glatt in 2-Aryl-6-phenyl-3,4,6,7-tetrahydro-2H-pyrazolo[3,4-e]1,2,4-triazin-3,7-dione bzw. in die 2,3,6,7-5H-Tetrahydrotautomeren (2) übergeführt.
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Slouka, J., Peč, P. Über die Synthese einiger Derivate des Pyrazolo [3,4-e]-1,2,4-triazins. Monatshefte für Chemie 103, 1444–1446 (1972). https://doi.org/10.1007/BF00904528
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DOI: https://doi.org/10.1007/BF00904528