反应详情

温度

52.5 °C

A mixture of 1-bromo-2-(1-ethoxyethyl)oxymethylbenzene (12.96 g, 0.05 mol) and THF (45 ml) was added to a mixture of magnesium (1.82 g, 0.075 mol) and bromoethane (0.2 ml) and THF (5 ml) at 45 to 55° C. under an atmosphere of nitrogen gas, and the resulting mixture was stirred at 50 to 55° C. for 1 hour to prepare a Grignard reagent. The Grignard reagent was added dropwise to a mixture of N-methoxy-5, N-dimethyl-3-isoxazolcarboxamide (5.62 g, 0.033 mol) and THF (40 ml) cooled to −50° C. The mixture was stirred at −60° C. to room temperature for 1 hour, water (200 ml) was added, and the mixture was extracted with ether (200 ml). The extract was dried over anhydrous magnesium sulfate and concentrated under reduced pressure. The residue was purified by silica gel chromatography (ethyl acetate/n-hexane) to give 2-(1-ethoxyethyl)oxymethylphenyl 5-methylisoxazol-3-yl ketone (8.61 g, yield: 90.2%) as a colorless oil.

1. temperaturecooled to −50° C
2. stirringThe mixture was stirred at −60° C. to room temperature for 1 hour
3. extractionthe mixture was extracted with ether (200 ml)
4. dry with materialThe extract was dried over anhydrous magnesium sulfate
5. concentrationconcentrated under reduced pressure
6. customThe residue was purified by silica gel chromatography (ethyl acetate/n-hexane)