反应详情

3-(2-(N-tert-Butoxycarbonylamino)ethoxy)-5-(4-hydroxyphenyl)isoxazole (0.15 g) was dissolved in tetrahydrofuran (1.5 ml), and triethylamine (0.07 ml) and acetyl chloride (0.04 ml) were added dropwise thereto at 5° C. under a nitrogen atmosphere, followed by stirring of the resulting mixture at room temperature for 30 minutes. The reaction mixture was poured into ice-cold water and extracted with ethyl acetate. The organic layer was washed with a saturated aqueous NaCl solution and dried over anhydrous magnesium sulfate. After filtration, the solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (eluent: hexane/ethyl acetate=2/1) to obtain the title compound (0.12 g, 71%) as a colorless powder.

1. customat 5° C.
2. additionThe reaction mixture was poured into ice-cold water
3. extractionextracted with ethyl acetate
4. washThe organic layer was washed with a saturated aqueous NaCl solution
5. dry with materialdried over anhydrous magnesium sulfate
6. filtrationAfter filtration
7. customthe solvent was evaporated under reduced pressure
8. customThe residue was purified by silica gel column chromatography (eluent: hexane/ethyl acetate=2/1)