反应详情

温度

90 °C

Potassium carbonate (19.8 g, 143 mmol) and benzyl chloride (16.5 mL, 143 mmol) were added to a suspension of 4-ethoxy-3-hydroxybenzaldehyde described in Production Example 15-1 (20 g, 120 mmol) in ethanol (200 mL) under nitrogen atmosphere at room temperature, and the mixture was heated and stirred at 90° C. for 2.5 hours. The mixture was cooled to 0° C., and 2 M hydrochloric acid, ethyl acetate, and water were added for partition. The organic layer was washed with a saturated saline solution, dried over anhydrous magnesium sulfate, and filtered. The solvent was evaporated and the resultant residue was purified with silica gel column chromatography (n-heptane:ethyl acetate=9:1-4:1-3:1). The target fraction was concentrated under vacuum to obtain the title compound (28.5 g, 92%).

1. temperaturethe mixture was heated
2. temperatureThe mixture was cooled to 0° C.
3. customfor partition
4. washThe organic layer was washed with a saturated saline solution
5. dry with materialdried over anhydrous magnesium sulfate
6. filtrationfiltered
7. customThe solvent was evaporated
8. customthe resultant residue was purified with silica gel column chromatography (n-heptane:ethyl acetate=9:1-4:1-3:1)
9. concentrationThe target fraction was concentrated under vacuum