2,5-Dihydroxybenzoic acid → 8-(2-Furylmethoxy)-8-oxooctyl 2,5-dihydroxybenzoate

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A mixture of 2,5-dihydroxybenzoic acid (4.8 g), 1,8-diazobicyclo[5.5.0]undec-7-ene (4.7 g), 2-furylmethyl 8-bromooctanoate (7.8 g) and acetonitrile (150 ml) was heated, under reflux for 18 h. The cooled reaction mixture was added to water (500 ml) and extracted with ethyl acetate (3×200 ml). The combined organic layers were washed with 1N-hydrochloric acid (150 ml) and water (2×20 ml), dried over magnesium sulphate and filtered. The solvent was removed in vacuum. The residue (8.4 g) was purified by column flash chromatography on silica gel using toluene/ethyl acetate (5:1) as eluent, to give 8-(2-furylmethoxy)-8-oxooctyl 2,5-dihydroxybenzoate as colourless oil.

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