[N+:1]([C:4]1[CH:10]=[C:9]([O:11][C:12]([F:15])([F:14])[F:13])[CH:8]=[CH:7][C:5]=1[NH2:6])([O-:3])=[O:2].[H-].[Na+].[CH3:18]I.[Cl-].[NH4+]>CN(C=O)C>[CH3:18][NH:6][C:5]1[CH:7]=[CH:8][C:9]([O:11][C:12]([F:13])([F:14])[F:15])=[CH:10][C:4]=1[N+:1]([O-:3])=[O:2]To a mixture of 2.22 g of 2-nitro-4-trifluoromethoxyaniline and 20 ml of DMF was added 0.44 g of sodium hydride (60% oily), and the mixture was stirred for 10 minutes under ice cool. To this mixture was added 1.42 g of methyl iodide, then, the mixture was stirred for 1 hour at room temperature. Into the reaction mixture, a saturated ammonium chloride aqueous solution was poured, and the mixture was extracted three times with ethyl acetate. The organic layer was dried over magnesium sulfate, then, concentrated under reduced pressure. The residue was subjected to silica gel column chromatography to obtain 1.80 g of N-methyl-2-nitro-4-trifluoromethoxyaniline.
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