反应详情

At 35° C., 13.7 g (0.04 mole) 4-chloro-3-(2,4-difluoro-5-nitrophenyl)-1-methyl-5-(trifluoromethyl)-1H-pyrazole, 5.5 g (0.04 mole) K2CO3, and 100 mL methanol were stirred for 1 hour. The reaction was cooled, diluted with 100 mL cold water, and extracted four times with ethyl acetate. The ethyl acetate extracts were washed with brine, dried over anhydrous MgSO4, and stripped in vacuo. The residue was purified chromatographically using 25% ethyl acetate in hexane as the eluent to give 13.0 g (90%) of 4-chloro-3-(2-fluoro-4-methoxy-5-nitrophenyl)-1-methyl-5-(trifluoromethyl)-1H-pyrazole as a white solid, mp 116° C.

1. temperatureThe reaction was cooled
2. extractionextracted four times with ethyl acetate
3. washThe ethyl acetate extracts were washed with brine
4. dry with materialdried over anhydrous MgSO4
5. customThe residue was purified chromatographically