5-Chloro-3-methyl-1-phenyl-1H-pyrazole-4-carboxaldehyde (1) was converted, via the oxime 2, into the chloronitrile 3. Treatment of compound 3 with methyl thioglycolate gave the novel methyl 4-amino-3-methyl-1-phenyl-1H-thieno [2, 3-c] pyrazole-5-carboxylate (4). This with 2, 5-dimethoxy-tetra-hydrofuran gave the pyrrolyl ester 5. Hydrazinolysis of the ester 5 gave the carbohydrazide derivative 6 which was used in the synthesis of substituted ...
