Hydrochloric Acid → 4-{[(2-{1-[5-(4-t-Butylphenyl)-4-hydroxy-3-thienyl]ethylidene}hydrazino)carbonothioyl]amino}benzoic acid

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Reaction Steps

2-(4-t-Butylphenyl)-3-hydroxy-4-methylcarbonylthiophene (31 mg, 0.11 mmol) synthesized in Reference Synthetic Example 33 and 4-hydrazinocarbonothioylaminobenzoic acid (23 mg, 0.11 mmol) were stirred with dimethylformamide (1.1 mL) and concentrated hydrochloric acid (0.05 mL) at room temperature for 30 hours. The reaction solution was partitioned between ethyl acetate and water, and the organic layer was washed with saturated aqueous sodium chloride and dried over anhydrous sodium sulfate. The resulting organic layer was concentrated and purified by silica gel column chromatography (chloroform) to give the desired product as a light brown solid (27 mg, yield 52%).

Provenance & Evidence