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温度

0 °C

In a round bottom flask under nitrogen was placed commercially available 2-methyl-5-nitrobenzene sulphonyl chloride (2.36 g, 10.0 mmol) and 75 L dry ethyl ether was added. The solution was cooled to 0° C. and concentrated ammonium hydroxide (10 mL) was added. After stirring overnight, the mixture was filtered and then diluted with dichloromethane (150 mL). The organic layer was separated and dried over MgSO4. The solution was then concentrated to afford 820 mg of the title compound as a white solid (38%): 1HNMR (DMSO-d6) δ8.61 (d, J=2.5 Hz, 1H), 8.35 (dd, J=8 Hz, 2.5 Hz, 1H), 7.79 (br s, 2H), 7.70 (d, J=8 Hz, 1H), 2.71 (s, 3H).

1. customIn a round bottom flask under nitrogen was placed commercially available
2. filtrationthe mixture was filtered
3. additiondiluted with dichloromethane (150 mL)
4. customThe organic layer was separated
5. dry with materialdried over MgSO4
6. concentrationThe solution was then concentrated