[Cl:1][C:2]1[N:7]=[C:6]([O:8][CH3:9])[C:5]([N:10]([CH2:13][C:14](=O)[CH3:15])[CH:11]=O)=[CH:4][CH:3]=1.C(O)(=O)C.C([O-])(=O)C.[NH4+:25].N>C(OCC)(=O)C>[Cl:1][C:2]1[N:7]=[C:6]([O:8][CH3:9])[C:5]([N:10]2[CH:13]=[C:14]([CH3:15])[N:25]=[CH:11]2)=[CH:4][CH:3]=1A mixture of N-(6-chloro-2-methoxypyridin-3-yl)-N-(2-oxopropyl)formamide (4.71 g), acetic acid (11.1 mL) and ammonium acetate (7.48 g) was stirred at 130° C. for one hour. The reaction solution was left to cool to room temperature. Ice water, ethyl acetate and aqueous ammonia were added and the organic layer was separated. The organic layer was dried over anhydrous magnesium sulfate and then concentrated under reduced pressure. The residue was purified by silica gel column chromatography (elution solvent: heptane-ethyl acetate system) to obtain 2.42 g of the title compound. The property values of the compound are as follows.
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