[CH3:1][O:2][CH2:3][O:4][C:5]1[CH:6]=[C:7]([CH2:15][C:16]([O:18][CH3:19])=[O:17])[CH:8]=[C:9]([O:11][CH2:12][O:13][CH3:14])[CH:10]=1.[Br:20]N1C(=O)CCC1=O.O>CN(C)C=O>[CH3:14][O:13][CH2:12][O:11][C:9]1[C:8]([Br:20])=[C:7]([CH2:15][C:16]([O:18][CH3:19])=[O:17])[CH:6]=[C:5]([O:4][CH2:3][O:2][CH3:1])[CH:10]=1Methyl 3,5-bis(methoxymethoxy)phenylacetate (43 g, 0.16 mol) obtained in Example 1, Step 1 was dissolved in N,N-dimethylformamide (0.68 L). After the solution was cooled to 4° C., N-bromosuccinimide (28 g, 0.16 mol) was added thereto, followed by stirring for 3 hours, while the temperature of the reaction mixture was raised to room temperature. To the reaction mixture was added water (0.50 L), and the mixture was extracted with a mixed solvent of hexane and ethyl acetate (hexane/ethyl acetate=1/2, 0.40 L×4). The organic layer was washed with a saturated aqueous solution of sodium chloride (50 mL) and dried over anhydrous sodium sulfate, followed by concentration under reduced pressure. The resulting residue was purified by silica gel column chromatography (ethyl acetate/hexane=1/4-1/2) to obtain a quantitative yield of methyl 3,5-bis(methoxymethoxy)-2-bromophenyl-acetate.
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