反应详情

At 0° C., a mixture of 5-chloro-4-formyl-3-(4-methoxy-3-methyl-phenyl)-1-methyl-1H-pyrazole (described in Reference Preparation example 91) 0.3 g and trifluoroacetic acid 10 ml was added trimethylsilane 0.27 g. The resulting mixture was stirred at room temperature for three hours, and thereto was added water 5 ml. The resulting mixture was extracted with ethyl acetate. The organic layer was washed with water and was dried over anhydrous magnesium sulfate, and was then concentrated under reduced pressure. The resulting residue was subjected to a silica gel column chromatography to give 5-chloro-3-(4-methoxy-3-methyl-phenyl)-1,4-dimethyl-1H-pyrazole 0.28 g.

1. extractionThe resulting mixture was extracted with ethyl acetate
2. washThe organic layer was washed with water
3. dry with materialwas dried over anhydrous magnesium sulfate
4. concentrationwas then concentrated under reduced pressure