[C:1]([NH:4][C:5]1[CH:10]=[CH:9][C:8]([C:11]2[O:12][C:13]3[C:21]([F:22])=[CH:20][C:19]([F:23])=[C:18]([NH2:24])[C:14]=3[C:15](=[O:17])[CH:16]=2)=[CH:7][C:6]=1[F:25])(=[O:3])[CH3:2].I[CH3:27].[H-].[Na+].O>CN(C)C=O>[C:1]([N:4]([C:5]1[CH:10]=[CH:9][C:8]([C:11]2[O:12][C:13]3[C:21]([F:22])=[CH:20][C:19]([F:23])=[C:18]([NH2:24])[C:14]=3[C:15](=[O:17])[CH:16]=2)=[CH:7][C:6]=1[F:25])[CH3:27])(=[O:3])[CH3:2]500 mg (1.44 mmol) of Compound 27 obtained in Example 27 was dissolved in 30 ml of dimethylformamide under argon atmosphere and the solution was cooled on ice. 0.27 ml of iodomethane and 63 mg of sodium hydride (60% oil dispersion) were added, the mixture was stirred at the same temperature for 1 hour and the temperature was raised to room temperature to stir for additional 2 hours. Water was added to the reaction solution and the mixture was extracted twice with ethyl acetate. The organic layer was washed once with water and once with an aqueous saturated solution of sodium chloride and dried over anhydrous magnesium sulfate, the solvent was distilled off and the tan residue was purified by silica gel column chromatography (n-hexane:ethyl acetate=3:2) to give 2-[4-(N-acetyl-N-methylamino)-3-fluorophenyl]-5-amino-6,8-difluoro-4H-1-benzopyran-4-one.
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