反应详情

温度

80 °C

A solution of 3.4 g (0.01 mole) 4-chloro-3-(2,4-difluoro-5-nitrophenyl)-1-methyl-5-(trifluoromethyl)-1H-pyrazole in 50 mL acetic acid was heated to 80° C. under a nitrogen atmosphere. The heat and nitrogen were removed and 1.7 g (0.03 mole) iron powder was added in 3 portions over 5 min. The solution was stirred at 80° C. for an additional 30 min. The solution was cooled and filtered through Celite®. The filtrate was diluted with 100 mL water and extracted three times with ethyl acetate. The ethyl acetate extracts were washed with a saturated NaHCO3 solution, dried over anhydrous MgSO4, and concentrated in vacuo. The residue was purified chromatographically using 35% ethyl acetate in hexane as the eluent to give 2.46 g (79%) of 5-(4-chloro-1-methyl-5-(trifluoromethyl)-1H-pyrazol-3-yl)-2,4-difluorobenzenamine as a white solid, mp 82° C.

1. temperatureThe heat
2. customnitrogen were removed
3. temperatureThe solution was cooled
4. filtrationfiltered through Celite®
5. additionThe filtrate was diluted with 100 mL water
6. extractionextracted three times with ethyl acetate
7. washThe ethyl acetate extracts were washed with a saturated NaHCO3 solution
8. dry with materialdried over anhydrous MgSO4
9. concentrationconcentrated in vacuo
10. customThe residue was purified chromatographically