[H-].[Na+].[Cl:3][C:4]1[CH:26]=[C:25]([C:27]([F:30])([F:29])[F:28])[CH:24]=[CH:23][C:5]=1[O:6][C:7]1[CH:22]=[CH:21][C:10]2[NH:11][C:12](=[O:20])[CH:13]([C:15]([O:17][CH2:18][CH3:19])=[O:16])[O:14][C:9]=2[CH:8]=1.[CH3:31]I.O>CN(C)C=O>[Cl:3][C:4]1[CH:26]=[C:25]([C:27]([F:28])([F:29])[F:30])[CH:24]=[CH:23][C:5]=1[O:6][C:7]1[CH:22]=[CH:21][C:10]2[N:11]([CH3:31])[C:12](=[O:20])[CH:13]([C:15]([O:17][CH2:18][CH3:19])=[O:16])[O:14][C:9]=2[CH:8]=160% Sodium hydride (1.0 g) was suspended in dimethylformamide (hereinafter abbreviated as DMF) (5 ml) and under ice-cooling, a DMF solution (5 ml) of ethyl 7-(2-chloro-4-trifluoromethylphenoxy)-3,4-dihydro-3-oxo-2H-1,4-benzoxazine-2-carboxylate (Compound 1) (0.8 g) was dropwise added thereto, followed by stirring for 10 minutes. Methyl iodide (0.4 g) was then added, the mixture was further stirred for 10 minutes, and to the reaction mixture was added water (20 ml) and the mixture was extracted twice with ethyl acetate (50 ml). The extract was washed with water and then saturated aqueous sodium chloride, and dried over magnesium sulfate. The solvent was then evaporated under a reduced pressure and the residue was purified by silica gel chromatography (eluant: n-hexane/ethyl acetate=3/1) to give 0.4 g of the title compound (colorless oil).
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