反应详情

温度

0 °C

6-Chloro-4-hydroxycoumarin (0.5 mmol, 0.099 g) is suspended in 5 mL of DCM, and enough DIEA is added to bring the pH to 9 as measured by pH paper. The solution is cooled to 0° C., and 5-bromo-thiophene-2-sulfonyl chloride (0.5 mmol, 0.13 g) is added. The solution is warmed to ambient temperature and is stirred 2 hrs. The solvent is removed under reduced pressure and the residue is triturated with Et2O. The resulting solid is filtered, is washed with Et2O, and is dried to afford the title compound (45 mg, 21%). 1H NMR (CDCl3, 300 MHz) δ 7.65 (1H, d, J=4.25 Hz), 7.56 (2H, m), 7.29 (1H, d, J=8.75 Hz), 7.19 (1H, d, J=4.25 Hz), 6.48 (1H, s), MS (ESI, Pos.) calcd for C13H6BrClO5S2 m/z [M+H]=420.9, found 420.9.

1. temperatureThe solution is warmed to ambient temperature
2. customThe solvent is removed under reduced pressure
3. customthe residue is triturated with Et2O
4. filtrationThe resulting solid is filtered
5. washis washed with Et2O
6. customis dried