反应详情

Magnesium (2.67 g, 0.11 mol) and bromoethane (0.2 ml) were added to a mixed solution of 1-bromo-2-(2-tetrahydropyranyloxymethyl)benzene (27.11 g, 0.10 mol) and THF (50 ml) under an atmosphere of nitrogen gas. The mixture was stirred at room temperature for 1 hour to prepare a Grignard reagent. The Grignard reagent was added dropwise to a mixed solution of diethyl oxalate (29.23 g, 0.20 mol) and THF (100 ml) cooled to -78° C. The mixture was stirred at -78° C. for 1 hour, water (150 ml) was added, and the mixture was extracted with ether (200 ml). The extract was dried over anhydrous magnesium sulfate and concentrated under reduced pressure. The resulting residue was purified by silica gel chromatography (ethyl acetate/n-hexane) to obtain ethyl 2-oxo-2-[2-(2-tetrahydropyranyloxymethyl)phenyl]acetate (22.60 g, Yield: 77.3%) as a colorless oil.

1. temperaturecooled to -78° C
2. stirringThe mixture was stirred at -78° C. for 1 hour
3. extractionthe mixture was extracted with ether (200 ml)
4. dry with materialThe extract was dried over anhydrous magnesium sulfate
5. concentrationconcentrated under reduced pressure
6. customThe resulting residue was purified by silica gel chromatography (ethyl acetate/n-hexane)