反应详情

To a mixture of 5-(4-trifluoromethylphenyl)-4-isoxazolylmethanol (5.65 g), tetrahydrofuran (20 ml) and toluene (80 ml) was added dropwise thionyl chloride (4.15 g) at 0° C. and the mixture was stirred at room temperature for 1 hr. The reaction mixture was concentrated, saturated aqueous sodium hydrogencarbonate was added to the residue, and the mixture was extracted with ethyl acetate. The ethyl acetate layer was washed with saturated brine, dried (MgSO4) and concentrated. The obtained colorless crystals were filtrated and recrystallized from ethyl acetate-hexane to give 4-chloromethyl-5-(4-trifluoromethylphenyl)isoxazole (4.70 g, yield 77%) as a colorless prism. melting point: 99–100° C.

1. concentrationThe reaction mixture was concentrated
2. additionsaturated aqueous sodium hydrogencarbonate was added to the residue
3. extractionthe mixture was extracted with ethyl acetate
4. washThe ethyl acetate layer was washed with saturated brine
5. dry with materialdried (MgSO4)
6. concentrationconcentrated
7. filtrationThe obtained colorless crystals were filtrated
8. customrecrystallized from ethyl acetate-hexane