Dimethylformamide → Methyl 4-{[(2-{1-[5-(3,4-dichlorophenyl)-4-hydroxy-1-methyl-1H-pyrazol-3-yl]ethylidene}hydrazino)-carbonothioyl]amino}-2-nitrobenzoate

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Dimethylformamide (1 ml) and conc. hydrochloric acid (1 drop) were added to 1-[5-(3,4-dichlorophenyl)-4-hydroxy-1-methyl-1H-pyrazol-3-yl]ethanone (60 mg, 0.21 mmol) synthesized in Synthetic Example 1 and methyl 4-hydrazinocarbonothioylamino-2-nitrobenzoate (57 mg, 0.21 mmol) synthesized in Reference Synthetic Example 56, and the mixture was stirred at room temperature for 21 hours. Water was added, and the precipitated solid was filtered, purified with a silica gel column chromatography (n-hexane/ethyl acetate=1/1 then chloroform/methanol=95/5). The obtained solid was extracted with ethyl acetate, washed with a saturated ammonium chloride aqueous solution, saturated sodium chloride aqueous solution. The organic layer was concentrated to obtain the desired product as a pale yellow solid (104 mg, yield 92%).

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