反应详情

4-(3-Hydroxyphenyl)-4-hydroxy-7-methoxymethyloxy-3-[4-(methoxymethyloxy)phenyl]-2,3-dihydro-4H-benzopyran (283 mg, 0.6 mmol), 1-bromo-5-chloropentane (598 mg, 3.2 mmol) and aqueous 2N-NaOH solution (1 ml) were dissolved in acetone (3 ml) and then refluxed for 6 hours. The reaction mixture was cooled to room temperature and then water was added thereto. The reaction solution was extracted with ethyl acetate and the organic layer was dried over anhydrous magnesium sulfate, filtered and concentrated under reduced pressure to remove the organic solvent. The concentrate was separated by column chromatography (n-hexane:ethyl acetate=8:1) to obtain 307 mg (yield: 94%) of the title compound as a colorless oil.

1. temperaturerefluxed for 6 hours
2. extractionThe reaction solution was extracted with ethyl acetate
3. dry with materialthe organic layer was dried over anhydrous magnesium sulfate
4. filtrationfiltered
5. concentrationconcentrated under reduced pressure
6. customto remove the organic solvent
7. customThe concentrate was separated by column chromatography (n-hexane:ethyl acetate=8:1)