反应详情

To a solution of ethyl 3-oxo-3-(4-pyridyl)propionate (13.9 g, 72.0 mmol) in 1,2-dimethoxyethane (100 ml) was added sodium hydride (60% in oil, 2.88 g, 72.0 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 (17.2 g, 72.0 mmol) in 1,2-dimethoxyethane (50 ml), and the mixture was stirred at room temperature for 4 hrs. The reaction solution was poured into water (300 ml), and extracted with ethyl acetate (500 ml×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 (hexane:ethyl acetate=4:1) and recrystallized from ethyl acetate-hexane to give ethyl 3-oxo-3-(4-pyridyl)-2-((4-(trifluoromethyl)phenyl)methyl)propionate (10.9 g, 43%).

1. temperaturecooling
2. stirringthe mixture was stirred at room temperature for 4 hrs
3. extractionextracted with ethyl acetate (500 ml×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 (hexane:ethyl acetate=4:1)
8. customrecrystallized from ethyl acetate-hexane