I[CH2:2][CH3:3].[OH:4][C:5]1[CH:14]=[C:13]([I:15])[CH:12]=[CH:11][C:6]=1[C:7]([O:9][CH3:10])=[O:8].C(=O)([O-])[O-].[K+].[K+].CN(C=O)C>O>[CH2:2]([O:4][C:5]1[CH:14]=[C:13]([I:15])[CH:12]=[CH:11][C:6]=1[C:7]([O:9][CH3:10])=[O:8])[CH3:3]2-Iodoethane (3.53 g) was added at room temperature to a mixture of methyl 2-hydroxy-4-iodobenzoate (4.19 g), potassium carbonate (4.17 g), and DMF (50 mL), and the resultant mixture was stirred at 70° C. for 1 hour in a nitrogen atmosphere. Water was added to the reaction mixture at room temperature, followed by extraction with ethyl acetate. The obtained organic layer was washed with water and saturated saline in this order and dried over anhydrous magnesium sulfate, and then, the solvent was distilled off under reduced pressure. The obtained residue was purified by silica gel column chromatography (hexane/ethyl acetate) to obtain the title compound (4.52 g).
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