Hydrochloric Acid → 4-[5-(3,5-Dichloro-phenyl)-5-trifluoromethyl-4,5-dihydro-isoxazol-3-yl]-2-methyl-benzaldehyde oxime

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Reaction Steps

A solution of 4-[5-(3,5-dichloro-phenyl)-5-trifluoromethyl-4,5-dihydro-isoxazol-3-yl]-2-methyl-benzaldehyde (i.e. the product of Step 1, 5.00 g), hydroxylamine hydrochloride (1.30 g) and concentrated hydrochloric acid (1 mL, 1.05 g) in MeOH (methanol) (37.5 mL) was stirred at 70° C. for 4 h. After cooling, the mixture was freed from all volatiles by evaporation and partitioned between MTBE and water. The organic layer was separated and dried. Chromatography over silica gel yielded the title compound (4.70 g, 91%).

Provenance & Evidence