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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]-1H-pyrazol-1-yl]benzonitrile (prepared in Example 1) (30.0 mg) in tetrahydrofuran (1.0 ml) was added at 0° C. lithium hexamethyldisilazide (0.1 ml: 1M tetrahydrofuran solution) followed by an addition of N-bromosuccinimide (14.4 mg), and the resulting mixture was stirred at 0° C. for a half hour. To the reaction mixture was added saturated aqueous ammonium chloride solution (5 ml) and the mixture was extracted with ethyl acetate (10 ml×2). The organic layer was washed with saturated saline (10 ml), dried over anhydrous sodium sulfate and then concentrated under reduced pressure. The residue was purified by silica gel column chromatography (eluent: hexane/ethyl acetate) to afford 4-[5-(6,6-dibromomethyl)-3-methyl-2,4-dioxo-1-(3-trifluoromethylphenyl)-1,2,3,4-tetrahydropyrimidin-5-yl]-1H-pyrazol-1-yl]benzonitrile (5.4 mg) and 4-[5-(6-bromomethyl)-3-methyl-2,4-dioxo-1-(3-trifluoromethylphenyl)-1,2,3,4-tetrahydropyrimidin-5-yl]-1H-pyrazol-1-yl]benzonitrile (6.9 mg). 4-(5-(6-(Bromomethyl)-3-methyl-2,4-dioxo-1-(3-(trifluoromethyl)phenyl)-1,2,3,4-tetrahydropyrimidin-5-yl)-1H-pyrazol-1-yl)benzonitrile:

1. extractionthe mixture was extracted with ethyl acetate (10 ml×2)
2. washThe organic layer was washed with saturated saline (10 ml)
3. dry with materialdried over anhydrous sodium sulfate
4. concentrationconcentrated under reduced pressure
5. customThe residue was purified by silica gel column chromatography (eluent: hexane/ethyl acetate)
6. customto afford 4-[5-(6,6-dibromomethyl)-3-methyl-2,4-dioxo-1-(3-trifluoromethylphenyl)-1,2,3,4-tetrahydropyrimidin-5-yl]-1H-pyrazol-1-yl]benzonitrile (5.4 mg) and 4-[5-(6-bromomethyl)-3-methyl-2,4-dioxo-1-(3-trifluoromethylphenyl)-1,2,3,4-tetrahydropyrimidin-5-yl]-1H-pyrazol-1-yl]benzonitrile (6.9 mg)