反应详情

Powdered potassium carbonate (3.36 g, 24.3 mmol) is added to a stirred solution of 4-bromo-2-methylphenol (3.03 g, 16.2 mmol) and bromoacetaldehyde dimethyl acetal (3.56 g, 21.1 mmol) in anhydrous DMF (20 mL). The resultant mixture is stirred at 85° C. under nitrogen for 24 hours. The mixture is cooled to ambient temperature; then water (100 mL) and EtOAc (100 mL) are added to the mixture. The organic layer is separated, dried over MgSO4, filtered and concentrated. The oil is chromatographed on silica (gradient 5-20% EtOAc in hexane) to give 1.78 g (6.47 mmol, 40% yield) of the title compound. EIMS: m/z 274 (M+, 79Br), 276 (M+, 81Br). Analysis for C11H15BrO3: calcd: C, 48.02; H, 5.50; found: C, 48.32; H, 5.53.

1. customThe organic layer is separated
2. dry with materialdried over MgSO4
3. filtrationfiltered
4. concentrationconcentrated
5. customThe oil is chromatographed on silica (gradient 5-20% EtOAc in hexane)