[Cl-].[NH4+:2].[F:3][C:4]1[CH:15]=[CH:14][CH:13]=[CH:12][C:5]=1[C:6]([N:8]([O:10][CH3:11])[CH3:9])=[O:7]>CO.O.[Fe]>[NH2:2][C:14]1[CH:13]=[CH:12][C:5]([C:6]([N:8]([O:10][CH3:11])[CH3:9])=[O:7])=[C:4]([F:3])[CH:15]=115.2 g of ammonium chloride and 8 g of iron powder were added to a suspension of 10.84 g of 2-fluoro-N-methoxy-N-methylbenzamide in 60 ml of methanol and 30 ml of water, and the reaction liquid was heated under reflux for 3 hours. The reaction liquid was filtered through Celite, and the solvent was evaporated away under reduced pressure. The resulting residue was diluted with ethyl acetate, washed with water, and dried with anhydrous magnesium sulfate. The solvent was evaporated away under reduced pressure, and the resulting residue was purified through silica gel column chromatography (developing solvent: hexane/ethyl acetate=9/1 to 1/2 to obtain the entitled compound as a brown oily substance.
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