反应详情

Hydroxylamine hydrochloride (1.1 g.; 0.016 mol.) was added to a mixture of ethyl-2-benzoyl-3-dimethylaminopropenoate (3.71 g.; 0.015 mol.) and anhydrous sodium acetate (1.25 g.; 0.015 mol.) in 50 ml. of ether and 25 ml. of methanol at 25° C. After 16 hours, the solvent was removed by evaporation and the residue was extracted with five 50 ml. portions of ether. The ether extracts were combined, washed with water, dried, filtered, then concentrated to yield an oil which was further purified by evaporative distillation at 60° C. and 0.55 torr. to yield ethyl-5-phenyl-4-isoxazolecarboxylate (1.03 g.; 32% yield) as a colorless liquid having the following analysis:

1. customat 25° C
2. customthe solvent was removed by evaporation
3. extractionthe residue was extracted with five 50 ml
4. washwashed with water
5. customdried
6. filtrationfiltered
7. concentrationconcentrated
8. customto yield an oil which
9. distillationwas further purified by evaporative distillation at 60° C.