反应详情

温度

50 °C

Oxalyl chloride (0.85 ml, 1.2 g, 9.8 mmol) followed by DMF (3 drops) were added to 1-methyl-3-(pentafluoroethyl)-4-(trifluoromethyl)-1H-pyrazole-5-carboxylic acid (2.03 g, 6.50 mmol) in dichloromethane (15 ml), and the mixture was heated to 50° C. After 5 h at 50° C., the mixture was concentrated under reduced pressure, THF (15 ml) and pyridine (1.1 ml, 1.0 g, 13 mmol, 2 eq.) were added, followed by 3-amino-2,6-difluorobenzonitrile (1.0 g, 6.5 mmol, 1.0 eq.) in THF (3 ml). The mixture was left at room temperature for 24 h, HC10N aq. solution) was added, the mixture was extracted with ethyl acetate and the extract was washed with HC10N aq. solution) and NaOH (2N aq. solution). The extract was dried over MgSO4 and filtered through silica gel. After concentration under reduced pressure, the product was purified by column chromatography on silica gel (hexane/ethyl acetate), giving N-(3-cyano-2,4-difluorophenyl)-1-methyl-3-(pentafluoroethyl)-4-(trifluoromethyl)-1H-pyrazole-5-carboxamide (1.29 g, 44%).

1. additionwere added
2. waitThe mixture was left at room temperature for 24 h
3. additionHC10N aq. solution) was added
4. extractionthe mixture was extracted with ethyl acetate
5. washthe extract was washed with HC10N aq. solution) and NaOH (2N aq. solution)
6. dry with materialThe extract was dried over MgSO4
7. filtrationfiltered through silica gel
8. concentrationAfter concentration under reduced pressure
9. customthe product was purified by column chromatography on silica gel (hexane/ethyl acetate)