Über die Synthese einiger Derivate des Pyrazolo 3,4-e-1,2,4-triazins

摘要

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-tetrahydropyrazolo3,4-e1,2,4-triazine-3,7-diones or into their corresponding 2,3,6,7-tetrahydro-5H-tautomers (2).