Hydroxyamine hydrochloride → 5-(Thiophen-2-YL)-1,2-oxazole

Participants

Reaction Steps

A mixture of β-dimethylamino-1-(2-thienyl)-2-propen-1-one (1) (18.1 g, 100 mmol) and hydroxylamine hydrochloride (7.0 g, 101 mmol) in anhydrous methanol (100 mL) is refluxed under nitrogen for 2 hrs. The reaction mixture is cooled, concentrated and partitioned between water and dichloromethane. The dichloromethane layer is dried with anhydrous sodium sulfate, filtered and concentrated to yield product (2) as a dark yellow-orange oil (14.7 g, 97 mmol, 97%).

Provenance & Evidence