反应详情

温度

-20 °C

To a mixture of 3-(3-methyl-5-phenyl-4-isoxazolyl)propionic acid (0.95 g), triethylamine (1.0 ml) and tetrahydrofuran (50 ml) was added ethyl chlorocarbonate (0.5 ml) at −30° C. and the mixture was stirred at −20° C. for 1 hr. To the obtained mixture was added aqueous ammonia (5 ml), and the mixture was stirred at room temperature for 1 hr. The reaction mixture was poured into water and the mixture was extracted with ethyl acetate. The ethyl acetate layer was washed with dilute hydrochloric acid, saturated aqueous sodium hydrogencarbonate and then saturated brine, dried (MgSO4) and concentrated to give 3-(3-methyl-5-phenyl-4-isoxazolyl)propionamide (0.86 g, yield 91%) as colorless crystals. The crystals were recrystallized from ethyl acetate-hexane. melting point: 149–151° C.

1. stirringthe mixture was stirred at room temperature for 1 hr
2. extractionthe mixture was extracted with ethyl acetate
3. washThe ethyl acetate layer was washed with dilute hydrochloric acid, saturated aqueous sodium hydrogencarbonate
4. dry with materialsaturated brine, dried (MgSO4)
5. concentrationconcentrated