Hydrochloric Acid → 2-Chloro-4-[5-(3,5-dichloro-phenyl)-5-trifluoromethyl-4,5-dihydro-isoxazol-3-yl]-benzaldehyde Oxime

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Reaction Conditions

Reaction Steps

To a solution of 2-Chloro-4-[5-(3,5-dichloro-phenyl)-5-trifluoromethyl-4,5-dihydro-isoxazol-3-yl]-benzaldehyde (i.e. the product of Step 2, 1.20 g) in methanol (5 mL) was added hydroxylamine hydrochloride (296 mg) and a catalytic amount of concentrated hydrochloric acid. The mixture was stirred at 70° C. for 3 h and concentrated in vacuum. Water was added and the mixture was extracted with ethyl acetate. Combined organic layers were dried (Na2SO4) and evaporated to obtain the title compound (1.2 g, 97%).

Provenance & Evidence