Water → 4-[5-(3,5-dichlorophenyl)-5-trifluoromethyl-4,5-dihydro-isoxazole-3-yl]-2-methyl-N-(2,2,2-trifluoroethoxymethyl)benzoic acid amide

Participants

Reaction Steps

In a solution of 1.70 g of 4-[5-(3,5-dichlorophenyl)-5-trifluoromethyl-4,5-dihydroisoxazole-3-yl]-2-methyl-N-(hydroxymethyl)benzoic acid amide in 20 mL of dichloromethane, 0.68 g of thionyl chloride was added at room temperature with stirring, and stirred at the same temperature for 2 hours. Then, the solvent was distilled off under reduced pressure, and the residue was dissolved in 10 mL of tetrahydrofuran. 1.50 g of 2,2,2-trifluoroethanol was added dropwise in a suspension of 0.33 g of 60% oily sodium hydride in 30 mL of tetrahydrofuran under cooling with ice and with stirring, and stirred at the same temperature for 10 minutes. Then, in this reaction mixture, the tetrahydrofuran solution of benzoic acid chloride prepared above was added dropwise under cooling with ice and with stirring. After the completion of the addition dropwise, it was continued to stir at room temperature for 1 hour. After the completion of the reaction, 50 mL of water was added in the reaction mixture, extracted with ethyl acetate (70 mL×1), the organic phase was dehydrated with and dried over saturated sodium chloride aqueous solution and then anhydrous magnesium sulfate, and the solvent was distilled off under reduced pressure. The residue was purified with silica gel column chromatography that was eluated with ethyl acetate-hexane (2:3) to obtain 1.20 g of the aimed product as colorless resinous substance.

Provenance & Evidence