反应详情

Potassium carbonate (9.42 mmol) and iodomethane (8.45 mmol) were added to a solution of crude ethyl 6-hydroxybenzo[d]isoxazole-3-carboxylate (2.42 mmol) in N,N-dimethylformamide (30 mL) and the reaction mixture was maintained for 48 h at rt in the dark. The reaction mixture was diluted with water (100 mL) and was extracted with ethyl acetate (2×100 mL). The combined organic layers were washed with brine (3×100 mL), dried (magnesium sulfate), and concentrated. The residue was purified by chromatography (30/1 petroleum ether/ethyl acetate) to provide ethyl 6-methoxybenzo[d]isoxazole-3-carboxylate in 19% yield as a yellow solid.

1. extractionwas extracted with ethyl acetate (2×100 mL)
2. washThe combined organic layers were washed with brine (3×100 mL)
3. dry with materialdried (magnesium sulfate)
4. concentrationconcentrated
5. customThe residue was purified by chromatography (30/1 petroleum ether/ethyl acetate)