[F:1][CH:2]([F:13])[O:3][C:4]1[CH:9]=[CH:8][CH:7]=[CH:6][C:5]=1[CH2:10][C:11]#N.Cl[Si](C)(C)C.C(=O)([O-])[O-:20].[K+].[K+].O.[CH2:26]([OH:28])[CH3:27]>C(OCC)(=O)C>[F:1][CH:2]([F:13])[O:3][C:4]1[CH:9]=[CH:8][CH:7]=[CH:6][C:5]=1[CH2:10][C:11]([O:28][CH2:26][CH3:27])=[O:20](2-Difluoromethoxyphenyl)acetonitrile (1.45 g) was added dropwise to a solution of chlorotrimethylsilane (2.23 mL) in ethanol (2.0 mL), and the reaction solution was stirred at 50° C. for five hours. The reaction solution was left to cool to room temperature. Then, potassium carbonate, water and ethyl acetate were added and the organic layer was separated. The resulting organic layer was dried over anhydrous magnesium sulfate and then concentrated under reduced pressure. The residue was purified by silica gel column chromatography (elution solvent: heptane-ethyl acetate system) to obtain 620 mg of the title compound. The property values of the compound are as follows.
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