Acetic Acid → 5-(3,6-dimethyl-2,4-dioxo-1-(3-trifluoromethylphenyl)-1,2,3,4-tetrahydropyrimidin-5-yl-4-(methylsulfonyl)-1H-pyrazol-1-yl)benzonitrile

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To a solution of 4-(5-(3,6-dimethyl-2,4-dioxo-1-(3-trifluoromethylphenyl)-1,2,3,4-tetrahydropyrimidin-5-yl-4-(methylthio)-1H-pyrazol-1-yl)benzonitrile (prepared in Example 269) (57.4 mg) in acetic acid (1.0 ml) were added aqueous hydrogen peroxide solution (63.4 μl) and sodium tungstate (3.8 mg) and the resulting mixture was stirred at room temperature for four hours. To the reaction mixture was added 10% aqueous sodium thiosulfate solution (1 ml) and the resulting mixture was stirred at room temperature for one hour. The reaction mixture was diluted with ethyl acetate (50 ml) and then washed with saturated saline (20 ml) and the organic layer was dried over anhydrous sodium sulfate. The organic layer was concentrated under reduced pressure and the residue was purified by silica gel column chromatography (eluent: hexane/ethyl acetate) to afford 4-(5-(3,6-dimethyl-2,4-dioxo-1-(3-trifluoromethylphenyl)-1,2,3,4-tetrahydropyrimidin-5-yl-4-(methylsulfonyl)-1H-pyrazol-1-yl)benzonitrile (29.4 mg).

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