反应详情

3,4-Dihydroxybenzaldehyde (101.6 g) and potassium carbonate (101.7 g) were suspended in N,N-dimethylformamide (500 mL). To the mixture was added dropwise ethyl iodide (58.8 mL) under ice-cooling, and the mixture was stirred at room temperature for 16 hours. To the reaction mixture was added dropwise 2 mol/L hydrochloric acid (500 mL), and the resulting mixture was extracted with ethyl acetate. The organic layer was washed with brine and dried over anhydrous magnesium sulfate. The solvent was removed under reduced pressure, and the obtained residue was purified by column chromatography on silica gel (eluent: ethyl acetate/hexane=1/1) to give the title compound (74.3 g).

1. temperaturecooling
2. extractionthe resulting mixture was extracted with ethyl acetate
3. washThe organic layer was washed with brine
4. dry with materialdried over anhydrous magnesium sulfate
5. customThe solvent was removed under reduced pressure
6. customthe obtained residue was purified by column chromatography on silica gel (eluent: ethyl acetate/hexane=1/1)