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0 °C

After 903 mg (20.7 mmol) of 55% sodium hydride were washed with hexane, it was suspended in 60 ml of 1,2-dimethoxyethane, and 4.63 g (20.7 mmol) of triethyl phosphonoacetate were added dropwise thereto while the suspension was stirred at 0° C. under nitrogen atmosphere. After 15 minutes, 2.00 g (11.5 mmol) of 4-(trifluoromethyl)benzaldehyde were added to the resulting mixture at the same temperature, followed by stirring of the mixture for 15 minutes. Ethyl acetate was added to the reaction mixture and the resulting mixture was washed with water. After drying, an oily residue obtained by evaporation of the solvent was subjected to column chromatography using silica gel and eluted with 4% ethyl acetate-hexane to obtain the title compound having a melting point of 31 to 32.5° C. in a yield of 98%.

1. stirringby stirring of the mixture for 15 minutes
2. washthe resulting mixture was washed with water
3. customAfter drying
4. customan oily residue obtained by evaporation of the solvent
5. washeluted with 4% ethyl acetate-hexane