反应详情

A solution of 3-fluoro-4-hydroxyacetophenone (0.061 g, 0.398 mmol), (benzo[c][1,2,5]oxadiazol-5-yl)methoxyamine hydrochloride (0.095 g, 0.470 mmol) and pyridine (0.13 ml, 1.61 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 water. The resultant suspension was extracted with dichloromethane (×3). The combined organic phases were washed with water and brine, dried over magnesium sulphate, filtered and concentrated to an off-white solid. The crude product was purified by column chromatography (SiO2), eluting with 9:1 petrol/ethyl acetate, to give a pale beige solid which was further washed with petrol/dichloromethane to give 3′-fluoro-4′-hydroxyacetophenone-O-[(benzo[c][1,2,5]oxadiazol-5-yl)methyl]oxime (CP9-128) as a pale beige solid (0.098 g, 82%), m.p. 139-140°.

1. temperatureat reflux under nitrogen for 4 h
2. concentrationThe solution was concentrated to a pale yellow oil which
3. additionwas diluted with water
4. extractionThe resultant suspension 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 an off-white solid
9. customThe crude product was purified by column chromatography (SiO2)
10. washeluting with 9:1 petrol/ethyl acetate
11. customto give a pale beige solid which
12. washwas further washed with petrol/dichloromethane