N[C:2]1[CH:11]=[C:10]2[C:5]([C:6](OC)=[C:7](OC(=O)C)[C:8](=[O:13])[N:9]2C)=[CH:4][CH:3]=1.C(=O)([O-])[O-].[K+].[K+].CI.O>CN(C=O)C>[NH:9]1[C:10]2[C:5](=[CH:4][CH:3]=[CH:2][CH:11]=2)[CH:6]=[CH:7][C:8]1=[O:13]
To a mixture of 0.95 g of 7-amino-3-acetoxy-4-methoxy-1-methyl-2(1H)-quinolinone (3.6 mmol) in 20 ml of DMF were added 0.55 g of potassium carbonate (4.0 mmol) and 0.56 g of methyl iodide (4.0 mmol) and stirred at room temperature for 1 hour. The reaction mixture was added to water and extracted with toluene, the organic layer was concentrated under reduced pressure. Purification of the residue by column chromatography on silica gel (hexane/ethyl acetate=1/1 as an eluent) gave 0.45 g of the title compound (9). (yield=45%)
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