Water → 3-(5-chloro-1-difluoromethyl-3-trifluoromethyl-1H-pyrazol-4-ylmethylthio)-5,5-dimethyl-2-isoxazoline

Participants

Reaction Conditions

Reaction Steps

3.1 g (22.5 mmoles) of anhydrous potassium carbonate was added to a solution of 2.3 g (7.3 mmoles) of 3-(5-chloro-3-trifluoromethyl-1H-pyrazol-4-ylmethylthio)-5,5-dimethyl-2-isoxazoline dissolved in 50 ml of N,N-dimethylformamide. Thereinto was blown chlorodifluoromethane. The resulting mixture was stirred at 130 to 140° C. for 3 hours to give rise to a reaction. After confirmation of the completion of the reaction, the reaction mixture was pored into water, followed by extraction with ethyl acetate. The resulting organic layer was washed with water and an aqueous sodium chloride solution and then dried over anhydrous magnesium sulfate. The resulting solution was subjected to vacuum distillation to remove the solvent contained therein. The residue was purified by silica gel column chromatography (developing solvent: hexane-ethyl acetate mixed solvent) to obtain 0.69 g (yield: 25.8%) of 3-(5-chloro-1-difluoromethyl-3-trifluoromethyl-1H-pyrazol-4-ylmethylthio)-5,5-dimethyl-2-isoxazoline as light yellow crystals (melting point: 41.0 to 42.0° C.) and 0.54 g (yield: 20.2%) of 3-(3-chloro-1-difluoromethyl-5-trifluoromethyl-1H-pyrazol-4-ylmethylthio)-5,5-dimethyl-2-isoxazoline as a white powder (melting point: 89.0 to 90.0° C.). 3-(5-Chloro-1-difluoromethyl-3-trifluoromethyl-1H-pyrazol-4-ylmethylthio)-5,5-dimethyl-2-isoxazoline

Provenance & Evidence