Triethylamine → Methyl 4-[5-(3,5-dichlorophenyl)-5-trifluoromethyl-4,5-dihydroisoxazol-3-yl]benzoate

Participants

Reaction Conditions

Reaction Steps

In a solution of 2.70 g of 4-(hydroxyiminomethyl)benzoic acid methyl ester in 15 ml of N,N-dimethylformamide, 2.04 g of N-chlorosuccinic acid imide was added, and stirred at 40° C. for 40 minutes. Then, the reaction mixture was cooled to 0° C., 3.40 g of 3,5-dichloro-1-(1-trifluoromethylethenyl)benzene and 1.72 g of triethylamine were added, continued to stir at room temperature for 18 hours. After the completion of the reaction, the reaction mixture was poured into 100 ml of ice water, extracted with ethyl acetate (50 ml×2), the organic phase was washed with water, dehydrated with saturated sodium chloride aqueous solution and dried over anhydrous sodium sulfate, and then the solvent was distilled off under reduced pressure. The residual solid was subjected to purification with medium-pressure preparative liquid chromatography (Yamazen Corporation, medium pressure preparative system; YFLC-Wprep) that was eluted with ethyl acetate-hexane (1:1 to 1:3 gradient), and 4.05 g of the aimed product was obtained as white crystal. Melting point 94.0 to 96.0° C.

Provenance & Evidence