[Br:1][C:2]1[C:3]([NH2:12])=[N:4][C:5](S(C)=O)=[N:6][C:7]=1[Cl:8].[NH:13]1[CH:17]=[CH:16][CH:15]=[N:14]1.C(=O)([O-])[O-].[Cs+].[Cs+].O>CN(C=O)C>[Br:1][C:2]1[C:3]([NH2:12])=[N:4][C:5]([N:13]2[CH:17]=[CH:16][CH:15]=[N:14]2)=[N:6][C:7]=1[Cl:8]
1 g (3.7 mmol) of 5-bromo-6-chloro-2-(methylsulfinyl)pyrimidine-4-amine (intermediate 2) was suspended in 10 ml of DMF. To this suspension were added 0.33 g (4.8 mmol) de pyrazole and 0.8 g of cesium carbonate. The reaction mixture was turned immediately light yellow color and allowed to stir at room temperature for about 1 to 2 hours. After nearly complete conversion to the corresponding monosubstituted derivative as was indicated by TLC the solution was poured onto 100 ml of cool water. The formed precipitated was filtered, washed with water and dried to afford 0.66 g (65%) of the desired product.
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