3-chloro-5,5-dimethyl-4H-1,2-oxazole

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 1.93 g (5.00 mmol) of 2-(5-difluoromethoxy-1-methyl-3-trifluoromethyl-1H-pyrazole-4-ylmethyl)-isothiourea hydrobromide in 10 ml of ethanol were added 0.48 g (12.00 mmol) of sodium hydroxide and 10 ml of -water, followed by 30 minutes of stirring at room temperature. Thereto was added 0.67 g (5.00 mmol) of 3-chloro-5,5-dimethyl-2-isoxazoline at room temperature, followed by further 12 hours of stirring under refluxing. After the completion of the reaction was confirmed, the solvent was removed by evaporation under reduced pressure. The obtained residue was poured into water and extracted with ethyl acetate. The resulting organic layer was washed with water and then dried over anhydrous magnesium sulfate. The solvent was removed by evaporation under reduced pressure and the residue was purified by silica gel column chromatography to obtain 1.02 g (yield: 56.7%) of 3-(5-difluoromethoxy-1-methyl-3-trifluoromethyl-1H-pyrazole-4-ylmethylthio)-5,5-dimethyl-2-isoxazoline. followed by further 12 hours of stirring under refluxing the solvent was removed by evaporation under reduced pressure The obtained residue was poured into water extracted with ethyl acetate The resulting organic layer was washed with water dried over anhydrous magnesium sulfate The solvent was removed by evaporation under reduced pressure the residue was purified by silica gel column chromatography

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 1.93 g (5.00 mmol) of 2-(5-difluoromethoxy-1-methyl-3-trifluoromethyl-1H-pyrazole-4-ylmethyl)-isothiourea hydrobromide in 10 ml of ethanol were added 0.48 g (12.00 mmol) of sodium hydroxide and 10 ml of -water, followed by 30 minutes of stirring at room temperature. Thereto was added 0.67 g (5.00 mmol) of 3-chloro-5,5-dimethyl-2-isoxazoline at room temperature, followed by further 12 hours of stirring under refluxing. After the completion of the reaction was confirmed, the solvent was removed by evaporation under reduced pressure. The obtained residue was poured into water and extracted with ethyl acetate. The resulting organic layer was washed with water and then dried over anhydrous magnesium sulfate. The solvent was removed by evaporation under reduced pressure and the residue was purified by silica gel column chromatography to obtain 1.02 g (yield: 56.7%) of 3-(5-difluoromethoxy-1-methyl-3-trifluoromethyl-1H-pyrazole-4-ylmethylthio)-5,5-dimethyl-2-isoxazoline. followed by further 12 hours of stirring under refluxing the solvent was removed by evaporation under reduced pressure The obtained residue was poured into water extracted with ethyl acetate The resulting organic layer was washed with water dried over anhydrous magnesium sulfate The solvent was removed by evaporation under reduced pressure the residue was purified by silica gel column chromatography

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 193.0 g (1.07 M) of 3-chloro-5,5-dimethyl-2-isoxazoline dissolved in 500 ml of DMF was dropwise added, with ice-cooling, 1.0 kg (content=15%, 2.14 M) of an aqueous sodium methanethiolate solution. The mixture was stirred at room temperature for 12 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 phase 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, to obtain 115.0 g (yield: 74.1%) of 3-methylthio-5,5-dimethyl-2-isoxazoline. This residue (141.2 mmoles) was dissolved in 1 liter of chloroform. Thereto was added, with ice-cooling, 392.0 g (1.59 M) of m-chloroperbenzoic acid (purity: 70%), followed by stirring at that temperature for 1 hour and at room temperature for 12 hours to give rise to a reaction. After the completion of the reaction, the precipitated m-chloroperbenzoic acid was removed by filtration. The filtrate was washed with an aqueous sodium hydrogensulfite solution, water, an aqueous sodium hydrogencarbonate solution and an aqueous sodium chloride solution in this order, and then dried over anhydrous magnesium sulfate. The resulting solution was subjected to vacuum distillation to remove the solvent contained therein. The residue was washed with diisopropyl ether to obtain 77.6 g (yield: 59.1%) of 3-methylsulfonyl-5,5-dimethyl-2-isoxazoline as a white powder (melting point: 82 to 84° C.). was dropwise added, with ice- cooling to give rise to a reaction After the completion of the reaction followed by extraction with ethyl acetate The resulting organic phase was washed with an aqueous sodium chloride solution dried over anhydrous magnesium sulfate The resulting solution was subjected to vacuum distillation to remove the solvent

Conditions: temp:100.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 2.8 g (22.5 mmoles) of benzylmercaptan dissolved in 50 ml of dimethylformamide were added, in a nitrogen current, 3.2 g (23.2 mmoles) of anhydrous potassium carbonate and 3.0 g (22.5 mmoles) of 3-chloro-5,5-dimethyl-2-isoxazoline. The mixture was stirred at 100° C. for 2 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 water and an aqueous sodium chloride solution in this order and then dried over anhydrous magnesium sulfate. The resulting solution was subjected to vacuum distillation to remove the solvent contained therein, and the residue was purified by silica gel column chromatography to obtain 3.1 g (yield: 62.0%) of 3-benzylthio-5,5-dimethyl-2-isoxazoline as a yellow oily substance (refractive index nD20=1.5521). to give rise to a reaction After the completion of the reaction followed by extraction with ethyl acetate The resulting organic layer was washed with water an aqueous sodium chloride solution in this order and then dried over anhydrous magnesium sulfate The resulting solution was subjected to vacuum distillation to remove the solvent the residue was purified by silica gel column chromatography

Conditions: temp:100.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 3.2 g (23.2 mmoles) of anhydrous potassium carbonate and 3.0 g (22.5 mmoles) of 3-chloro-5,5-dimethyl-2-isoxazoline were added, in a nitrogen atmosphere, to a solution of 2.8 g (22.5 mmoles) of benzylmercaptan dissolved in 50 ml of N,N-dimethylformamide. The mixture was stirred at 100° C. for 2 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 water and an aqueous sodium chloride solution in this order 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 to obtain 3.1 g (yield: 62.0%) of 3-benzylthio-5,5-dimethyl-2-isoxazoline as a yellow oily substance (nD20=1.5521). to give rise to a reaction After the completion of the reaction followed by extraction with ethyl acetate The resulting organic layer was washed with water an aqueous sodium chloride solution in this order and then dried over anhydrous magnesium sulfate The resulting solution was subjected to vacuum distillation to remove the solvent The residue was purified by silica gel column chromatography

Conditions: temp:100.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 3.2 g (23.2 mmoles) of anhydrous potassium carbonate and 3.0 g (22.5 mmoles) of 3-chloro-5,5-dimethyl-2-isoxazoline were added, in a nitrogen atmosphere, to a solution of 2.8 g (22.5 mmoles) of benzylmercaptan dissolved in 50 ml of N,N-dimethylformamide. The mixture was stirred at 100° C. for 2 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 water and an aqueous sodium chloride solution in this order 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 to obtain 3.1 g (yield: 62.0%) of 3-benzylthio-5,5-dimethyl-2-isoxazoline as a yellow oily substance (nD20=1.5521). to give rise to a reaction After the completion of the reaction followed by extraction with ethyl acetate The resulting organic layer was washed with water an aqueous sodium chloride solution in this order and then dried over anhydrous magnesium sulfate The resulting solution was subjected to vacuum distillation to remove the solvent The residue was purified by silica gel column chromatography

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 1.93 g (5.00 mmol) of 2-(5-difluoromethoxy-1-methyl-3-trifluoromethyl-1H-pyrazole-4-ylmethyl)-isothiourea hydrobromide in 10 ml of ethanol were added 0.48 g (12.00 mmol) of sodium hydroxide and 10 ml of -water, followed by 30 minutes of stirring at room temperature. Thereto was added 0.67 g (5.00 mmol) of 3-chloro-5,5-dimethyl-2-isoxazoline at room temperature, followed by further 12 hours of stirring under refluxing. After the completion of the reaction was confirmed, the solvent was removed by evaporation under reduced pressure. The obtained residue was poured into water and extracted with ethyl acetate. The resulting organic layer was washed with water and then dried over anhydrous magnesium sulfate. The solvent was removed by evaporation under reduced pressure and the residue was purified by silica gel column chromatography to obtain 1.02 g (yield: 56.7%) of 3-(5-difluoromethoxy-1-methyl-3-trifluoromethyl-1H-pyrazole-4-ylmethylthio)-5,5-dimethyl-2-isoxazoline. followed by further 12 hours of stirring under refluxing the solvent was removed by evaporation under reduced pressure The obtained residue was poured into water extracted with ethyl acetate The resulting organic layer was washed with water dried over anhydrous magnesium sulfate The solvent was removed by evaporation under reduced pressure the residue was purified by silica gel column chromatography