[CH:1]([N:3]([CH2:16][C:17](=O)[CH3:18])[C:4]1[CH:13]=[CH:12][C:7]([C:8]([O:10][CH3:11])=[O:9])=[CH:6][C:5]=1[O:14][CH3:15])=O.C([O-])(=O)C.[NH4+:24].C(OCC)(=O)C.C(=O)([O-])O.[Na+]>C(O)(=O)C>[CH3:15][O:14][C:5]1[CH:6]=[C:7]([CH:12]=[CH:13][C:4]=1[N:3]1[CH:16]=[C:17]([CH3:18])[N:24]=[CH:1]1)[C:8]([O:10][CH3:11])=[O:9]A mixture of methyl 4-[formyl(2-oxopropyl)amino]-3-methoxybenzoate (32.6 g) and ammonium acetate (47.5 g) in acetic acid (65.6 mL) was stirred at 140° C. for 1 hr. After completion of the reaction, ethyl acetate and saturated aqueous sodium hydrogen carbonate solution were added under ice-cooling, and the organic layer was separated. To the aqueous layer was added ethyl acetate, and the organic layer was separated. The organic layers were combined, washed with saturated brine, and dried over anhydrous magnesium sulfate, and the solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (methanol/ethyl acetate/hexane) to give the title compound (16.0 g).
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