[Br:1][C:2]1[CH:21]=[CH:20][CH:19]=[CH:18][C:3]=1[CH2:4][N:5]1[C:10]2[N:11]=[C:12](SC)[N:13]=[CH:14][C:9]=2[CH:8]=[CH:7][C:6]1=[O:17].O[O:23][S:24]([O-:26])=O.[K+].[CH3:28]O>O>[Br:1][C:2]1[CH:21]=[CH:20][CH:19]=[CH:18][C:3]=1[CH2:4][N:5]1[C:10]2[N:11]=[C:12]([S:24]([CH3:28])(=[O:26])=[O:23])[N:13]=[CH:14][C:9]=2[CH:8]=[CH:7][C:6]1=[O:17]To a solution of 8-(2-bromobenzyl)-2-(methylthio)pyrido[2,3-d]pyrimidin-7(8H)-one (0.24 g, 0.66 mmol) in methanol (20 mL) was added the solution of Oxone (720 mg, 1.17 mmol) in water (10 mL). The mixture was stirred for 18 h, then evaporated to dryness. The residue was dissolved in the mixture of dichloromethane (20 mL) and water (20 mL), separated, and the aqueous layer was extracted with dichloromethane (1×20 mL), and the combined organic layers were dried over sodium sulfate, filtered and concentrated in vacuo to give 8-(2-bromobenzyl)-2-(methylsulfonyl)pyrido[2,3-d]pyrimidin-7(8H)-one as a beige solid (0.17 g, 0.43 mmol, 65%). ESMS m/z 394 (M+H)+.
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