反应详情

4-Ethoxycarbonylfuran-2-carboxylic acid (0.47 g, 2.53 mmol) was dissolved in tetrahydrofuran (10 mL), triethylamine (0.53 mL, 3.80 mmol) and ethyl chloroformate (0.29 mL, 3.04 mmol) were added at 0° C., and the mixture was stirred at room temperature for 1 hour. The reaction mixture was filtered through celite, water (0.23 mL, 12.7 mmol) and sodium borohydride (0.19 g, 5.06 mmol) were added to the filtrate, and the mixture was stirred overnight. 1N Hydrochloric acid was added to the reaction mixture, and the mixture was extracted with ethyl acetate. The extract was washed with saturated brine, dried over anhydrous sodium sulfate and concentrated under reduced pressure. The obtained residue was purified by silica gel column chromatography (hexane/ethyl acetate=50/50) to give the title compound (0.34 g).

1. additionwere added to the filtrate
2. stirringthe mixture was stirred overnight
3. extractionthe mixture was extracted with ethyl acetate
4. washThe extract was washed with saturated brine
5. dry with materialdried over anhydrous sodium sulfate
6. concentrationconcentrated under reduced pressure
7. customThe obtained residue was purified by silica gel column chromatography (hexane/ethyl acetate=50/50)