反应详情

A mixture of methyl 4-sulfamoylthiophene-3-carboxylate (2.7 g, 12.2 mmol), methanol (12 mL), and a 25% methanolic solution of sodium methylate (3.6 mL) was refluxed for 48 h. The reaction mixture was cooled to room temperature and acidified with concentrated hydrochloride acid, and the precipitated product was collected and washed with water. Recrystallized from water, yielded 400 mg of the title compound. MS: 187.8 (M−1), 189.5 (M+1). 1H NMR (DMSO-d6): 8.34 (d, J=4.4 Hz, 1H), 7.705 (d, J=4.8 Hz, 1H).

1. customthe precipitated product was collected
2. washwashed with water
3. customRecrystallized from water