Triethylamine → 3-(4-Bromo-3-nitrophenyl)-5-(3,5-dichlorophenyl)-5-trifluoromethyl-4,5-dihydroisoxazole

Participants

Reaction Conditions

Reaction Steps

In a solution of 1.27 g of 4-bromo-3-nitrobenzaldoxime in 16 ml of N,N-dimethylformamide, 0.74 g of N-chlorosuccinic acid imide was added, and stirred at 35° C. for 90 minutes. Then, the reaction mixture was cooled with ice, 1.20 g of 3,5-dichloro-1-(1-trifluoromethylethenyl)benzene synthesized in Step 1 of Synthetic Example 3 and 0.60 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 in 50 ml of ice water, extracted with ethyl acetate (50 ml×2), the organic phase was 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 (1:2 to 1:4 gradient), and 1.10 g of the aimed product was obtained as yellow crystal.

Provenance & Evidence