反应详情

Potassium carbonate (2.5 eq) was added to a solution of 2′,4′-dihydroxyacetophenone (1 eq) in acetonitrile (400 mL), and the suspension stirred at room temperature. Benzyl bromide (2.5 eq) was added drop wise over 10 minutes and the mixture heated at reflux for 18 hours. The mixture was cooled and evaporated in vacuo to give slurry. The slurry was partitioned between water and ethyl acetate, and the layers were separated. The aqueous layer was further extracted with dichloromethane and the organic extracts were combined, dried (MgSO4) and evaporated in vacuo. The product was triturated with hexane, filtered and washed with cold hexane and dried in vacuo at 45° C. to give 1-(2,4-Bis-benzyloxy-phenyl)-ethanone as a white powder.

1. temperaturethe mixture heated
2. temperatureat reflux for 18 hours
3. temperatureThe mixture was cooled
4. customevaporated in vacuo
5. customto give slurry
6. customThe slurry was partitioned between water and ethyl acetate
7. customthe layers were separated
8. extractionThe aqueous layer was further extracted with dichloromethane
9. dry with materialdried (MgSO4)
10. customevaporated in vacuo
11. customThe product was triturated with hexane
12. filtrationfiltered
13. washwashed with cold hexane
14. customdried in vacuo at 45° C.