Potassium Carbonate → 3-(5-chloro-1-phenyl-3-trifluoromethyl-1H-pyrazol-4-ylmethylthio)-5,5-dimethyl-2-isoxazoline

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Reaction Steps

2.1 g of sodium hydrosulfide hydrate (purity: 70%, 26.2 mmoles) was added to a solution of 2.3 g (13.1 mmoles) of 3-methylsulfonyl-5,5-dimethyl-2-isoxazoline dissolved in 20 ml of N,N-dimethylformamide. The mixture was stirred for 2 hours. Thereto were added 1.8 g (13.1 mmoles) of anhydrous potassium carbonate, 2.0 g (13.1 mmoles) of Rongalit and 3.6 g (10.5 mmoles) of 4-bromomethyl-5-chloro-1-phenyl-3-trifluoromethyl-1H-pyrazole. The resulting mixture was stirred at room temperature for 15 hours to give rise to a reaction. After the completion of the reaction, the reaction mixture was poured into water, followed by extraction with ethyl acetate. The resulting organic layer was washed with 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 2.7 g (yield: 65.5%) of 3-(5-chloro-1-phenyl-3-trifluoromethyl-1H-pyrazol-4-ylmethylthio)-5,5-dimethyl-2-isoxazoline as white crystals (melting point: 89 to 90° C.).

Provenance & Evidence