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15.0 g (55.6 mmol) of 1,2-dihydro-4-((4-ethylphenyl)methyl)-5-(trifluoromethyl)-3H-pyrazol-3-one (4) (prepared by the method described in J. Med. Chem 1996, 39, 3920-3928) was dissolved in 150 ml of dimethylformamide, and cooled to 0° C. Then, 9.3 g (61.1 mmol) of t-butyl dimethylsilyl chloride was added to the above solution in small portions, and thereafter 4.2 g (61.1 mmol) of imidazole was added in small portions. The temperature of the resultant mixture was returned to room temperature and the mixture was stirred for 3 hours. After the addition of water to the reaction mixture, the reaction mixture was extracted with ethyl acetate twice. The resultant organic layer was washed with a saturated sodium chloride aqueous solution, dried over anhydrous sodium sulfate and concentrated, to give 21.4 g (55.6 mmol) of the intended compound (100% yield).

1. customwas returned to room temperature
2. extractionthe reaction mixture was extracted with ethyl acetate twice
3. washThe resultant organic layer was washed with a saturated sodium chloride aqueous solution
4. dry with materialdried over anhydrous sodium sulfate
5. concentrationconcentrated