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The title compound was prepared by a slightly modified literature procedure.* 3-aminophenyl methyl sulfone hydrochloride (1.18 g, 5.70 mmol) was suspended in water/CH2Cl2. The mixture was neutralized with 25% aqueous NaOH. The CH2Cl2 layer was isolated and evaporated to dryness. Aqueous H2SO4 (60%; 10 mL) was added to the residue and the solution was cooled to 0° C. A solution of NaNO2 (0.345 g, 5.00 mmol) in water (5 mL) was added dropwise. The solution was stirred at 0° C. for 30 min. and at 90° C. for 30 min. The reaction mixture was allowed to come to room temperature. Extraction with CH2Cl2, drying (MgSO4), and concentration gave 0.39 g (40%) of the title compound as a solid. MS m/z 172 (M)+. HRMS m/z calcd for C7H8O3S (M)+ 172.0194, found 172.0198.

1. customevaporated to dryness
2. additionAqueous H2SO4 (60%; 10 mL) was added to the residue
3. customto come to room temperature
4. extractionExtraction with CH2Cl2
5. customdrying
6. concentration(MgSO4), and concentration