Potassium Carbonate → Methyl 3-(cyanomethoxy)benzoate

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To a solution of methyl 3-hydroxybenzoate (5.00 g, 32.9 mmol) in acetone (60 mL) were added bromoacetonitrile (2.63 mL, 39.4 mmol) and potassium carbonate (6.81 g, 49.3 mmol), and the mixture was stirred at 60° C. for 4 hr. To the reaction mixture was added saturated aqueous sodium hydrogen carbonate solution (100 mL), and the mixture was extracted with ethyl acetate (100 mL, 30 mL). The combined organic layer was washed with saturated brine (10 mL), and dried over anhydrous magnesium sulfate. Insoluble material was filtered off, and the filtrate was concentrated under reduced pressure. The obtained residue was purified by basic silica gel column chromatography (ethyl acetate/n-hexane=10/90→20/80), and the fraction containing the object product was concentrated under reduced pressure to give the title compound (5.43 g, 86%) as a colorless oil.

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