[C:1]([NH:9][C:10]1[C:11]([F:20])=[C:12]([CH:17]=[CH:18][CH:19]=1)[C:13]([O:15][CH3:16])=[O:14])(=[O:8])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[H-].[Na+].[CH2:23](I)[CH3:24].O>CN(C)C=O>[CH2:23]([N:9]([C:10]1[C:11]([F:20])=[C:12]([CH:17]=[CH:18][CH:19]=1)[C:13]([O:15][CH3:16])=[O:14])[C:1](=[O:8])[C:2]1[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=1)[CH3:24]Methyl 3-benzamido-2-fluorobenzoate (3.10 g, 11.0 mmol) was dissolved in N,N-dimethylformamide (30 ml), and the solution was cooled. 60% Sodium hydride (0.53 g, 13.2 mmol) was added thereto, and the reaction mixture was agitated without heating or cooling. 10 minutes later, ethyl iodide (2.05 g, 13.0 mmol) was added to the mixture, and the mixture was agitated overnight at room temperature. Water was added dropwise to the reaction mixture, and the reaction mixture was extracted with ethyl acetate, and dried over anhydrous sodium sulfate. The sodium sulfate was filtered away, and then the filtrate was concentrated under reduced pressure. The concentration residue was purified by silica gel column chromatography (developer solvent: ethyl acetate/n-hexane=1/5), as a result of which 2.03 g (yield: 61%) of the indicated compound was obtained.
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