反应详情

To a solution of ethyl 3-(3,4-difluorophenyl)-3-oxopropionate (9 g, 39.4 mmol) in 1,2-dimethoxyethane (50 ml) was added sodium hydride (60% in oil, 1.58 g, 39.4 mmol) under ice-cooling and the mixture was stirred at room temperature for 30 min. To the reaction solution was dropwise added a solution of 4-trifluoromethylbenzyl bromide (9.43 g, 39.4 mmol) in 1,2-dimethoxyethane (50 ml) and the reaction solution was stirred at room temperature for 3 hrs. The reaction solution was poured into water (200 ml) and extracted with ethyl acetate (200ml×2). The extract was washed with water and saturated brine, dried over anhydrous magnesium sulfate and evaporated under reduced pressure. The residue was purified by silica gel column chromatography (toluene:hexane=1:1) and recrystallized from diisopropyl ether-hexane to give ethyl 3-(3,4-difluorophenyl)-3-oxo-2-((4-(trifluoromethyl)phenyl)methyl)propionate (10.9 g, 71%).

1. temperaturecooling
2. stirringthe reaction solution was stirred at room temperature for 3 hrs
3. extractionextracted with ethyl acetate (200ml×2)
4. washThe extract was washed with water and saturated brine
5. dry with materialdried over anhydrous magnesium sulfate
6. customevaporated under reduced pressure
7. customThe residue was purified by silica gel column chromatography (toluene:hexane=1:1)
8. customrecrystallized from diisopropyl ether-hexane