[CH3:1][O:2][C:3]1[C:8]([CH3:9])=[CH:7][N:6]=[C:5]([CH2:10][OH:11])[C:4]=1[CH3:12]>C(Cl)(Cl)Cl.[O-2].[O-2].[Mn+4]>[CH3:1][O:2][C:3]1[C:8]([CH3:9])=[CH:7][N:6]=[C:5]([CH:10]=[O:11])[C:4]=1[CH3:12](4-methoxy-3,5-dimethyl-pyridin-2-yl)methanol (Tokyo Kasei Kogyo Co., Ltd.) (300 mg) was dissolved in chloroform (15 ml) and added with manganese dioxide (chemically processed product) (3.00 g), followed by stirring for 3 hours. After completion of the reaction, the solution was filtrated through Celite and the solvent was then distilled off, thereby obtaining the subject compound (297 mg) as a white solid.
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