Sulfuric Acid → 5-((3,5-Dichloropyridin-4-yl)thio)-4-nitrothiophene-2-carboxylic acid

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Ethyl 5-[(3,5-dichloro-4-pyridyl)sulfanyl]-4-nitro-thiophene-2-carboxylate (1.8 g, 4.74 mmol) was added to a solution of concentrated sulfuric acid (10 mL) diluted with water (20 mL), and the resulting mixture was heated at 100° C. for 5 hours. After this time, the mixture was poured into ice (4.5 mL) and stirred at room temperature for 20 minutes, then the resulting solid was collected by filtration, washed with water and dried in vacuo at 40° C. overnight to afford the title product as a white solid (1.3 g, 78% yield). 1H NMR (400 MHz, d6-DMSO) δ: 9.0 (2H, s), 8.1 (1H, s). MS m/z: 350.85, 352.90 [M+H]+.

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