反应详情

To a solution (15 ml) of methyl 4-[chloro(hydroxyimino)methyl]benzoate (0.425 g) and 1-ethynyl-4-trifluoromethylbenzene (0.534 g) in tetrahydrofuran was added dropwise a solution (10 ml) of triethylamine (0.697 ml) in tetrahydrofuran under an argon atmosphere at 0° C. This mixture was stirred overnight at room temperature and poured into water. The mixture was extracted with ethyl acetate. The organic layer was washed with water and saturated brine, dried over anhydrous magnesium sulfate and concentrated. The residue was recrystallized from hexane-ethyl acetate to give methyl 4-[5-(4-trifluoromethylphenyl)-3-isoxazolyl]benzoate (0.563 g, yield 65%) as colorless needle crystals. melting point: 183–184° C.

1. extractionThe mixture was extracted with ethyl acetate
2. washThe organic layer was washed with water and saturated brine
3. dry with materialdried over anhydrous magnesium sulfate
4. concentrationconcentrated
5. customThe residue was recrystallized from hexane-ethyl acetate