Methanol → Benzoic acid, 3-(aminosulfonyl)-, methyl ester

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3-sulfamoylbenzoic acid (150 mg, 0.746 mmol) was refluxed in the presence of concentrated Sulfuric acid (4.82 mg, 0.037 mmol) in methanol (5 mL) at 70° C. for overnight. Reaction was monitored by TLC. After completion of the reaction, Solvent was removed by vacuum and then compound was purified by flash chromatography afforded the methyl 3-sulfamoylbenzoate (115 mg, 0.524 mmol, 70.2% yield) as a solid. 1H NMR (CDCl3, 400 MHz): δ 8.53 (m, 1H), 8.18 (d, 1H, J=8.0 Hz), 8.08 (d, 1H, J=7.6 Hz), 7.57 (t, 1H, J=8.0 Hz), 3.92 (s, 3H). Mass [M+H]+:216.0

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