CN(C)C=O.[Br:6][C:7]1[CH:8]=[CH:9][C:10]([O:14][CH2:15][O:16][CH3:17])=[C:11]([OH:13])[CH:12]=1.C(=O)([O-])[O-].[K+].[K+].[CH:24]1(Br)[CH2:27][CH2:26][CH2:25]1>O>[Br:6][C:7]1[CH:8]=[CH:9][C:10]([O:14][CH2:15][O:16][CH3:17])=[C:11]([O:13][CH:24]2[CH2:27][CH2:26][CH2:25]2)[CH:12]=1
To 10 ml of N,N-dimethylformamide solution containing 1.73 g (7.4 mmol) of 5-bromo-2-methoxymethoxyphenol obtained in Reference Example 5-(b) were added 1.0 g (7.2 mmol) of potassium carbonate and 1.0 g (7.4 mmol) of cyclobutyl bromide, and the mixture was stirred at 100° C. for 5 hours. After completion of the reaction, 10 ml of water was added to the reaction mixture, and the mixture was extracted with ethyl acetate. The organic layer after separation was washed with a saturated aqueous solution of sodium chloride, dried over anhydrous sodium sulfate and then concentrated under reduced pressure. The obtained residue was applied to silica gel column chromatography (Eluent; hexane:ethyl acetate=9:1 (V/V)), and the fractions containing the desired compound were concentrated under reduced pressure to obtain 1.4 g of the title compound as a colorless oil. (Yield: 66%)
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