反应详情

To a stirred solution of 0.68 gram (0.0020 mole) of 5-amino-1-(2,3,5,6-tetrafluoro-4-trifluoromethylphenyl)-4-nitropyrazole and 0.42 gram (0.0042 mole) of triethylamine in 20 mL of tetrahydrofuran was added dropwise a solution of 0.55 gram (0.0040 mole) of acetoxyacetyl chloride in 8 mL of tetrahydrofuran. The reaction mixture was heated at reflux for two hours. An additional 0.43 gram of acetoxyacetyl chloride and 0.22 gram of triethylamine were added, and the mixture was heated at reflux for 20 minutes. The mixture was cooled and filtered,, and the filtrate was evaporated under reduced pressure, leaving an oil. This oil was purified by column chromatography on silica gel, eluted with ethyl acetate/n-hexane (50:50) to yield 0.11 gram of 1-(2,3,5,6-tetrafluoro-4-trifluoromethylphenyl)-5-methylcarbonyloxymethylcarbonylamino-4-nitropyrazole as a waxy solid, Compound 14 of Table 1. The nmr spectrum was consistent with the proposed structure.

1. temperatureThe reaction mixture was heated
2. temperatureat reflux for two hours
3. temperaturethe mixture was heated
4. temperatureat reflux for 20 minutes
5. temperatureThe mixture was cooled
6. filtrationfiltered
7. customthe filtrate was evaporated under reduced pressure
8. customleaving an oil
9. customThis oil was purified by column chromatography on silica gel
10. washeluted with ethyl acetate/n-hexane (50:50)