Cl[C:2]1[C:11]2[C:10](=[O:12])[N:9]([CH3:13])[C:8](=[O:14])[N:7]([CH3:15])[C:6]=2[N:5]=[CH:4][CH:3]=1.C>CO.[Pd]>[CH3:15][N:7]1[C:6]2[N:5]=[CH:4][CH:3]=[CH:2][C:11]=2[C:10](=[O:12])[N:9]([CH3:13])[C:8]1=[O:14]0.34 g of Compound 1 was dissolved in 100 ml of methanol and reduced in the presence of Pd-C. Activated charcoal powder was added, and the solution was heated and filtered. The filtrate was distilled under reduced pressure and ethanol was added thereto. The resulting crude crystals were separated from the solution by the filtration and recrystallized from ethanol to give 0.24 g of 1,3-dimethylpyrido[2,3-d]pyrimidine-2,4-dione (Compound 2).
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