[NH2:1][C:2]1[N:7]([C:8]2[CH:13]=[CH:12][CH:11]=[CH:10][CH:9]=2)[C:6](=[O:14])[N:5]([CH3:15])[C:4](=[O:16])[CH:3]=1.P(Cl)(Cl)(Cl)=O.[OH-].[Na+].CN(C)[CH:26]=[O:27]>O>[NH2:1][C:2]1[N:7]([C:8]2[CH:13]=[CH:12][CH:11]=[CH:10][CH:9]=2)[C:6](=[O:14])[N:5]([CH3:15])[C:4](=[O:16])[C:3]=1[CH:26]=[O:27]6-Amino-3-methyl-1-phenyl-2,4 (1H, 3H)-pyrimidinedione (5.00 g, 23 mmol) was suspended in dimethylformamide (77 mL). To the resultant suspension was added phosphorus oxychloride (2.57 mL, 27.6 mmol), and the resultant mixture was reacted at 60° C. for 3 h. The reaction mixture was diluted with water, and adjusted to ca. pH 12 with sodium hydroxide. The precipitates formed in the reaction mixture was filtered to give a crude product. The crude product was recrystallized from a mixture of ethanol, ethyl acetate and water to give an aldehyde, 6-amino-5-formyl-3-methyl-1-phenyl-2,4 (1H, 3H)-pyrimidinedione (yield 75%).
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