反应详情

Under a nitrogen atmosphere, in a round-bottom flask were placed 880 mg (22mmol) of 60% sodium hydride (NaH) and 12 ml of N,N-dimethylformamide. To the system were added 2.9 ml (4 g, 40 mmol) of 2,2,2-trifluoroethanol via syringe over a period of 15 minutes and the mixture was stirred at room temperature for 20 minutes. To the system were added 1.72 g (10 mmol) of 2,5-dichlorobenzonitrile, and the mixture was heated at 90° C. for three days. The mixture was cooled to room temperature, poured into 50 ml of 2M aqueous HCl and extracted with three portions of ether. The combinedorganic fractions were dried (Na2SO4) and concentrated to afford2.5 g of a solid. The crude material was purified by flash column chromatography using 1:49 ethyl acetate/hexanes as the eluant to obtain 1.4 g of 5-chloro-2-(2,2,2-trifluoroethoxy)benzonitrile as a white solid.

1. customUnder a nitrogen atmosphere, in a round-bottom flask were placed
2. temperaturethe mixture was heated at 90° C. for three days
3. temperatureThe mixture was cooled to room temperature
4. extractionextracted with three portions of ether
5. dry with materialThe combinedorganic fractions were dried (Na2SO4)
6. concentrationconcentrated to afford2
7. customThe crude material was purified by flash column chromatography