反应详情

温度

90 °C

A solution of 3-hydroxy-4-methoxybenzophenone (4.6 g, 20 mmol) in dimethylformamide (35 ml) was treated with sodium hydride (600 mg, 25 mmol) at 0° C. for 20 minutes, then 1,3-dibromopropane (5 g, 24.7 mmol) was added in one portion. The mixture was heated at 90° C. for 1 hour, and then stirred at room temperature for 2 hours. At the end of the reaction, the mixture was poured into water (500 ml) and extracted with ethyl acetate (400 ml). The ethyl acetate solution was washed with water, brine and dried over anhydrous MgSO4. The solvent was removed and the crude oil was purified by flash chromatography over a silica gel column (SiO2, 85 g; eluted with 3:1 hexane:dichloromethane, 1.6 1; 3:7 hexane: dichloromethane, 1.4 1). The pure product thus obtained weighed 4.67 g, (66%) as an oil. Recrystallization twice from isopropyl ether (500 ml) gave analytically pure 3-(3-bromopropoxy-4-methoxyphenyl)phenylmethanone (2.42 g), m.p.=81°-83° C.

1. customAt the end of the reaction
2. extractionextracted with ethyl acetate (400 ml)
3. washThe ethyl acetate solution was washed with water, brine
4. dry with materialdried over anhydrous MgSO4
5. customThe solvent was removed
6. customthe crude oil was purified by flash chromatography over a silica gel column (SiO2, 85 g; eluted with 3:1 hexane:dichloromethane, 1.6 1; 3:7 hexane: dichloromethane, 1.4 1)
7. customThe pure product thus obtained
8. customRecrystallization twice from isopropyl ether (500 ml)