P(Cl)(Cl)([Cl:3])=O.S[C:7]1[N:12]([CH3:13])[C:11](=[O:14])[CH:10]=[C:9]([C:15]2[CH:20]=[CH:19][N:18]=[CH:17][N:16]=2)[N:8]=1.C(=O)([O-])[O-].[K+].[K+]>CN(C)C=O>[Cl:3][C:7]1[N:12]([CH3:13])[C:11](=[O:14])[CH:10]=[C:9]([C:15]2[CH:20]=[CH:19][N:18]=[CH:17][N:16]=2)[N:8]=1Phosphorous oxychloride (4.60 g, 30 mmol) was added to dimethylformamide (32 ml) and stirred for 20 min at 0° C. 2-Mercapto-3-methyl-6-(4-pyrimidyl)-3H-pyrimidine-4-one (4.40 g, 20 mmol) was added to the solution and stirred 5 min and then stirred at 70° C. for 2 hours. The reaction mixture was poured into ice water, neutralized by solid potassium carbonate, and extracted with ethyl acetate. The organic layer was washed with brine, dried over sodium sulfate, and evaporated under reduced pressure. Purification of the residue by silica gel chromatography (ethyl acetate) gave the title compound (1.20 g, 27%).
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