反应详情

A solution of 4-fluoro-3-methoxyacetophenone (0.056 g, 0.332 mmol), (benzo[c][1,2,5]oxadiazol-5-yl)methoxyamine hydrochloride (0.072 g, 0.359 mmol) and pyridine (0.10 ml, 1.24 mmol) in ethanol (5 ml) was stirred at reflux under nitrogen for 4 h and cooled to room temperature. The solution was concentrated to a pale yellow oil which was diluted with dichloromethane/water. The resultant mixture was extracted with dichloromethane (×3). The combined organic phases were washed with water and brine, dried over magnesium sulphate, filtered and concentrated to a white solid. The crude product was purified by column chromatography (SiO2), eluting with 9:1 petrol/ethyl acetate, to give a 4′-fluoro-3′-methoxyacetophenone-O-[(benzo[c][1,2,5]oxadiazol-5-yl)methyl]oxime (CP9-129) as a white solid (0.078 g, 74%), m.p. 65°.

1. temperatureat reflux under nitrogen for 4 h
2. concentrationThe solution was concentrated to a pale yellow oil which
3. additionwas diluted with dichloromethane/water
4. extractionThe resultant mixture was extracted with dichloromethane (×3)
5. washThe combined organic phases were washed with water and brine
6. dry with materialdried over magnesium sulphate
7. filtrationfiltered
8. concentrationconcentrated to a white solid
9. customThe crude product was purified by column chromatography (SiO2)
10. washeluting with 9:1 petrol/ethyl acetate