反应详情

温度

-78 °C

Under an argon atmosphere, to a solution of ethyl diethoxyacetate (1.80 mL, 10.1 mmol) in THF (20 mL) was added slowly a THF solution of (32) prepared above at −78° C. After stirring at −78° C. for an hour, to this was added 20% aqueous solution of ammonium chloride (10 mL) and the product was extracted with ethyl acetate (×3). The organic layer was sequentially washed with water (×1) and saturated brine (×1), and dried over anhydrous sodium sulfate. After filtration, the mixture was concentrated under reduced pressure and the residue was purified by silica gel flash column chromatography (n-hexane/ethyl acetate=9/1) to give 1,1-diethoxy-3-(4-methylphenyl)propan-2-one (33) as a colorless oily substance (1.96 g, 8.27 mmol, 82.4%).

1. customprepared above at −78° C
2. extractionthe product was extracted with ethyl acetate (×3)
3. washThe organic layer was sequentially washed with water (×1) and saturated brine (×1)
4. dry with materialdried over anhydrous sodium sulfate
5. filtrationAfter filtration
6. concentrationthe mixture was concentrated under reduced pressure
7. customthe residue was purified by silica gel flash column chromatography (n-hexane/ethyl acetate=9/1)