反应详情

A mixture of 4'-cyano-2'-(2,4-difluorophenoxy)methanesulfonanilide (1.5 g), hydroxylamine hydrochloride (0.8 g), and sodium carbonate (1.2 g) in ethanol (21 ml) and water (32 ml) was refluxed for 13 hours. The mixture was concentrated and the residue was dissolved in water, acidified with diluted hydrochloric acid, and extracted with ethyl acetate. The extract was washed with water, dried, and concentrated. The residue was purified by column chromatography on silica gel (40 g) eluting with a mixture of toluene and ethyl acetate (1:1) to give colorless crystals of 3-(2,4-difluorophenoxy)-4-(methanesulfonamido)benzamidoxime (1.0 g).

1. temperaturewas refluxed for 13 hours
2. concentrationThe mixture was concentrated
3. dissolutionthe residue was dissolved in water
4. extractionextracted with ethyl acetate
5. washThe extract was washed with water
6. customdried
7. concentrationconcentrated
8. customThe residue was purified by column chromatography on silica gel (40 g)
9. washeluting with a mixture of toluene and ethyl acetate (1:1)