反应详情

A solution of 0.5 g of 1-cyanomethyl-3-(2,6-difluorophenyl)pyrazole dissolved in 10 ml of THF was dropwise added to a suspension of 0.15 g of 55% sodium hydride in 10 ml of THF, at 50° C. After the resulting product was stirred for 30 minutes, a solution of 0.67 g of 1-(1-methyl-3, 5-dichloropyrazole-4-carbonyl)pyrazole dissolved in 10 ml of THF was dropwise added thereto at 50° C. and then stirred overnight at room temperature. The reaction mixture was poured into water, then extracted with ethyl acetate and washed with a small amount of water. The resulting product was dried over sodium sulfate, and the solvent was distilled off under reduced pressure. The residual product was recrystallized from a mixed solvent of isopropyl ether/ethyl acetate=3/1 to obtain 0.52 g of 2-{3-(2,6-difluorophenyl)pyrazol-1-yl}-3-(l-methyl-3,5-dichloropyrazol-4-yl)-3-hydroxyacrylonitrile.

1. additionwas dropwise added
2. stirringat 50° C. and then stirred overnight at room temperature
3. extractionextracted with ethyl acetate
4. washwashed with a small amount of water
5. dry with materialThe resulting product was dried over sodium sulfate
6. distillationthe solvent was distilled off under reduced pressure
7. customThe residual product was recrystallized from a mixed solvent of isopropyl ether/ethyl acetate=3/1