反应详情

温度

40 °C

Oxalyl chloride (0.65 ml, 0.95 g, 7.5 mmol, 1.5 eq.) followed by DMF (3 drops) were added to 1-methyl-3-(pentafluoroethyl)-4-(trifluoromethyl)-1H-pyrazole-5-carboxylic acid (1.56 g, 5.00 mmol) in dichloromethane (20 ml), and the mixture was heated to 40° C. After 9 h at 40° C., the mixture was concentrated under reduced pressure, THF (20 ml) and pyridine (0.8 ml, 0.8 g, 2.0 eq.) were added, followed by 1-(5-amino-2-chlorophenyl)ethanone (0.85 g, 5.00 mmol, 1.0 eq.) in THF (5 ml). The mixture was left at room temperature for 2 d. HCl N aq. solution) was added, the mixture was extracted with ethyl acetate and the extract was washed with HCl (1N aq. solution), NaOH ON aq. solution) and sat. aq. sodium chloride solution. The extract was dried over MgSO4 and, after concentration under reduced pressure, the product was purified by column chromatography on silica gel (hexane/ethyl acetate) to give N-(3-acetyl-4-chlorophenyl)-1-methyl-3-(pentafluoroethyl)-4-(trifluoromethyl)-1H-pyrazole-5-carboxamide (1.85 g, 80%).

1. additionwere added
2. waitThe mixture was left at room temperature for 2 d
3. extractionthe mixture was extracted with ethyl acetate
4. washthe extract was washed with HCl (1N aq. solution), NaOH ON aq. solution) and sat. aq. sodium chloride solution
5. dry with materialThe extract was dried over MgSO4
6. concentrationafter concentration under reduced pressure
7. customthe product was purified by column chromatography on silica gel (hexane/ethyl acetate)