反应详情

300 mg 1-(4-Bromo-3-methyl-phenyl)-3-(3,5-dichloro-phenyl)-4,4,4-trifluoro-but-2-en-1-one (IVa), 80 mg MeNHOH.HCl and 100 mg triethylamine were refluxed in 2 ml of ethanol for 18 hours. After evaporation of the solvent the residue was purified on silica gel giving 210 mg (65%) of 3-(4-Bromo-3-methyl-phenyl)-5-(3,5-dichloro-phenyl)-2-methyl-5-trifluoromethyl-2,5-dihydro-isoxazole (IIIa) as a colorless resin.

1. customAfter evaporation of the solvent the residue
2. customwas purified on silica gel giving 210 mg (65%) of 3-(4-Bromo-3-methyl-phenyl)-5-(3,5-dichloro-phenyl)-2-methyl-5-trifluoromethyl-2,5-dihydro-isoxazole (IIIa) as a colorless resin