Azo Compounds Derived from 1H-5-amino-4-ethoxycarbonyl-3-methyl- pyrazole and Phenols or Phenolic Derivatives and Possibilities of Their Cyclization to Pyrazolo(5,1-c)benzo(1,2-e)(1,2,4)triazines

The coupling reaction of 1H-4-ethoxycarbonyl-3-methyl-pyrazol-5-yl-diazonium chloride (2) with phenols and phenolic derivatives leads to 1H-5-arylazo-4-ethoxycarbonyl-3-methyl-pyrazoles, which were characterized by TLC, MS, IR, VIS, 1H-NMR and 13C-NMR spectroscopy. The cyclization of one of the synthesized azo compounds [1H-4-ethoxycarbonyl-5-(4,6-dimethoxy-2-hydroxy-phenylazo)-3-methylpyrazole] led to the corresponding pyrazolo[5,1-c]benzo[1,2-e][1,2,4]triazinic derivative.