[CH2:1]([Li])CCC.[CH3:6][O:7][CH:8]([O:23][CH3:24])[C:9]1[CH:14]=[CH:13][CH:12]=[C:11]([C:15]([F:18])([F:17])[F:16])[C:10]=1[O:19][CH2:20][O:21][CH3:22].CN(C)CCN(C)C.CI.[Cl-].[NH4+]>O1CCCC1>[CH3:6][O:7][CH:8]([O:23][CH3:24])[C:9]1[C:10]([O:19][CH2:20][O:21][CH3:22])=[C:11]([C:15]([F:17])([F:18])[F:16])[CH:12]=[CH:13][C:14]=1[CH3:1]A n-butyllithium-1.59M n-hexane solution (40.0 ml, 64.4 mmol) was added dropwise to a solution of 1-(dimethoxymethyl)-2-(methoxymethoxy)-3-(trifluoromethyl)benzene (12.0 g, 42.9 mmol) obtained in Example (6-4) and N,N,N′,N′-tetramethylethylenediamine (9.70 ml, 64.4 mmol) in tetrahydrofuran (100 ml) at −40° C. over 5 minutes. The reaction mixture was stirred at 0° C. for 15 minutes. After the reaction mixture was cooled to −40° C., methyl iodide (5.3 ml, 85.85 mmol) was added thereto and the mixture was further stirred at room temperature for 30 minutes. A saturated aqueous ammonium chloride solution was poured into the reaction mixture and the mixture was extracted with ethyl acetate. The organic layer was successively washed with water (twice) and a saturated aqueous NaCl solution and dried with anhydrous sodium sulfate. The residue obtained by removing the solvent under reduced pressure was purified by silica gel column chromatography (eluting solvent: n-hexane/ethyl acetate=5/1) to give 2-(dimethoxymethyl)-3-(methoxymethoxy)-1-methyl-4-(trifluoromethyl)benzene as an oil (7.19 g, yield: 57%).
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