反应详情

Triethylamine (2.37 mL) and hydroxylamine hydrochloride (634 mg) were added to a solution of 2,6-difluoroacetophenone (890 mg) in ethanol (30 mL), and the reaction solution was heated to reflux for 4 hours. The reaction solution was returned to room temperature, and the solvent was evaporated under reduced pressure. Zinc (1.86 g) was added to a solution of the resulting residue in trifluoroacetic acid (10 mL), and the reaction solution was stirred at room temperature overnight. The reaction solution was filtered on a celite, made basic with a 5 N aqueous solution of sodium hydroxide, and then extracted with chloroform. The resulting organic layer was dried over magnesium sulfate, and the solvent was evaporated under reduced pressure to obtain 210 mg of a crude purified product containing the title compound (purity: 50 wt %). The physical properties of the compound are as follows.

1. temperaturethe reaction solution was heated
2. temperatureto reflux for 4 hours
3. customwas returned to room temperature
4. customthe solvent was evaporated under reduced pressure
5. additionZinc (1.86 g) was added to a solution of the resulting residue in trifluoroacetic acid (10 mL)
6. filtrationThe reaction solution was filtered on a celite
7. extractionextracted with chloroform
8. dry with materialThe resulting organic layer was dried over magnesium sulfate
9. customthe solvent was evaporated under reduced pressure
10. customto obtain 210 mg of a crude
11. custompurified product
12. additioncontaining the title compound (purity: 50 wt %)