反应详情

温度

-70 °C

To a solution of 3-(4-methylsulfonylphenyl)-4-(4-fluorophenyl)thiophene (0.332 g, 1.0 mmol) in THF (8 mL) at −70° C. under nitrogen was added 1.6 M n-butyl lithium in hexane (0.66 mL, 1.05 mmol) slowly, via syringe, and the mixture stirred at −70° C. for 20 minutes and then at room temperature (25° C.) for 1 hour. After cooling to −70° C., a 1.0 M solution of tri-n-butyl borane in THF (1.15 mL, 1.15 mmol) was added and the mixture allowed to warm slowly to 0° C. for 1 hour, warmed to room temperature for 2 hours, and finally stirred at reflux overnight (18 hours). After cooling to room temperature and stirring for 3 hours, water (0.8 mL) was added followed by sodium acetate (0.6 g) and hydroxylamine-O-sulfonic acid (0.41 g). After stirring at room temperature. overnight, the mixture was poured into 3 volumes of ethyl acetate, and the organic layer washed with water and brine and dried over MgSO4. After solvent removal, the white solids (a mixture of product and starting material) were separated via flash chromatography on silica gel using a 15% ethyl acetate/85% toluene eluant to yield the benzenesulfonamide as a white solid (59 mg, mp 194–195° C.). Anal. Calc'd for C16H12NO2S2F: C, 57.64; H, 3.63; N, 4.20. Found: C, 57.37; H, 3.69; N, 3.99.

1. waitat room temperature (25° C.) for 1 hour
2. temperatureAfter cooling to −70° C.
3. temperatureto warm slowly to 0° C. for 1 hour
4. temperaturewarmed to room temperature for 2 hours
5. stirringfinally stirred
6. temperatureat reflux overnight (18 hours)
7. temperatureAfter cooling to room temperature
8. stirringstirring for 3 hours
9. stirringAfter stirring at room temperature
10. washthe organic layer washed with water and brine
11. dry with materialdried over MgSO4
12. customAfter solvent removal
13. additionthe white solids (a mixture of product and starting material)
14. customwere separated via flash chromatography on silica gel using a 15% ethyl acetate/85% toluene eluant