Hydroxyamine hydrochloride → 5-Phenyl-4-(trifluoromethyl)isoxazole-3-carbaldehyde oxime

Participants

Reaction Steps

A mixture of 5-phenyl-4-(trifluoromethyl)isoxazole-3-carbaldehyde (step B, 0.415 g, 1.721 mmol), hydroxylamine hydrochloride (0.179 g, 2.58 mmol), and sodium acetate (0.212 g, 2.58 mmol) in methanol (5 mL) was heated at reflux for 45 min. The reaction mixture was cooled to room temperature and concentrated under reduced pressure. The residue was suspended in water (10 mL), and the solid was collected by vacuum filtration, washed with water (2×5 mL), and dried overnight under reduced pressure to give 5-phenyl-4-(trifluoromethyl)isoxazole-3-carbaldehyde oxime (0.360 g, 1.41 mmol, 82% yield). The compound had an HPLC ret. time=2.43 min. (condition A); LC/MS M+1=256.9.

Provenance & Evidence