反应详情

A mixture of 1.5 grams (0.0034 mole) of 1-(2,3,5,6-tetrafluoro-4-trifluoromethylphenyl)-5-methylcarbonyloxymethylcarbonylamino -4-nitropyrazole, 2.63 mL of a 2N aqueous sodium hydroxide solution, 1.5 mL of ethanol, and 4.7 mL of water was stirred at room temperature for 15 minutes. After the pH was adjusted to 5.0 with dilute hydrochloric acid, ethanol was removed from the mixture by distillation under reduced pressure. The remaining aqueous phase was extracted with methylene chloride, and the extract was washed with water. The washed organic phase was dried over anhydrous magnesium sulfate and filtered. The filtrate was evaporated under reduced pressure to yield 0.75 gram of 1-(2,3,5,6-tetrafluoro-4-trifluoromethylphenyl)-5 -hydroxymethylcarbonylamino-4-nitropyrazole as a solid (compound 19 of Table 1). The nmr spectrum was consistent with the proposed structure.

1. customwas removed from the mixture by distillation under reduced pressure
2. extractionThe remaining aqueous phase was extracted with methylene chloride
3. washthe extract was washed with water
4. dry with materialThe washed organic phase was dried over anhydrous magnesium sulfate
5. filtrationfiltered
6. customThe filtrate was evaporated under reduced pressure