[CH3:1][C:2]1([CH3:21])[O:6][CH:5]([CH2:7][C:8]2[CH:17]=[C:16]3[C:11]([CH2:12][CH2:13][C:14](=[O:18])[NH:15]3)=[CH:10][C:9]=2[O:19][CH3:20])[CH2:4][O:3]1.[H-].[Na+].I[CH3:25]>CN(C)C=O.C(OCC)(=O)C>[CH3:1][C:2]1([CH3:21])[O:6][CH:5]([CH2:7][C:8]2[CH:17]=[C:16]3[C:11]([CH2:12][CH2:13][C:14](=[O:18])[N:15]3[CH3:25])=[CH:10][C:9]=2[O:19][CH3:20])[CH2:4][O:3]1300 mg of 7-((2,2-dimethyl-[1,3]dioxolan-4-yl)methyl)-6-methoxy-1,2,3,4-tetrahydroquinolin-2-one was dissolved in 6 ml of N,N-dimethylformamide. While cooling on ice, 49 mg of 60% sodium hydride was added to the reaction solution, and the obtained mixture was then stirred at room temperature for 30 minutes. Thereafter, 0.29 g of iodomethane was added to the reaction solution while cooling on ice. The obtained mixture was stirred at room temperature for 2 hours. The reaction solution was diluted with ethyl acetate and then washed with a saturated ammonium chloride aqueous solution and a saturated sodium chloride aqueous solution. The organic layer was dried over magnesium sulfate and then concentrated under a reduced pressure. The residue was purified by NH silica gel column chromatography (hexane-ethyl acetate), so as to obtain 310 mg of the subject compound.
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