[CH3:1][O-:2].[Na+].CO.CO.Cl[C:9]1[CH:14]=[C:13]([C:15]([O:17]C)=[O:16])[CH:12]=[C:11]([C:19]2[CH:24]=[CH:23][CH:22]=[CH:21][CH:20]=2)[N:10]=1.Cl>CC(N(C)C)=O>[CH3:1][O:2][C:9]1[CH:14]=[C:13]([C:15]([OH:17])=[O:16])[CH:12]=[C:11]([C:19]2[CH:24]=[CH:23][CH:22]=[CH:21][CH:20]=2)[N:10]=125% NaOMe/methanol solution (92 μL) was added to an MeOH (2 mL) solution of methyl 2-chloro-6-phenylpyridine-4-carboxylate (1100 mg), and stirred at room temperature for 2 hours. Further, 25% NaOMe/methanol solution (92 μL) was added to it, and stirred under heat with refluxing for 2 hours and 30 minutes. DMA (3 mL) was added to it, and stirred overnight at 130° C., then 25% NaOMe/methanol solution (92 μL) was added to it, and stirred at 130° C. for 7 hours. With cooling with ice, diluted hydrochloric acid was added to it, the formed precipitate was taken out through filtration, washed with water, dried, and purified through reversed-phase high-performance liquid chromatography [acetonitrile/water+0.11% trifluoroacetic acid] to obtain the title compound as a white powder.
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