反应详情

温度

0 °C

2,5-Bis(2-fluorophenyl)-2,4-dihydro-3H-pyrazol-3-one (0.63 g, 2.3 mmol) was suspended in acetonitrile (10 mL), treated with triethylamine (0.27 mL, 2.7 mmol, 1.15 equiv) and cooled to 0° C. To the mixture was added 4-acetamidobenzenesulfonyl azide (0.61 g, 2.5 mmol, 1.1 equiv) and after 30 minutes at 0° C., the mixture was warmed to ambient temperature. After stirring for 30 minutes, the mixture was poured into sodium carbonate (25 mL, aqueous saturated) and sodium hydroxide (10 mL, 1 N aqueous) and extracted with dichloromethane (2×125 mL). The combined organic extracts were dried with sodium sulfate, filtered and concentrated in vacuo. The residue was purified by silica gel gradient chromatography (100:0 to 0:100; hexanes:ethyl acetate), providing the titled compound.

1. temperaturethe mixture was warmed to ambient temperature
2. extractionextracted with dichloromethane (2×125 mL)
3. dry with materialThe combined organic extracts were dried with sodium sulfate
4. filtrationfiltered
5. concentrationconcentrated in vacuo
6. customThe residue was purified by silica gel gradient chromatography (100:0 to 0:100; hexanes:ethyl acetate)