Hydrochloric Acid → 5-Cyclopropyl-3-phenyl-isoxazole-4-carboxylic acid methoxy-methyl-amide

Participants

Reaction Conditions

Reaction Steps

A mixture of 5-cyclopropyl-3-phenyl-isoxazole-4-carboxylic acid (3.72 g, 16 mmol), N,O-dimethylhydroxylamine hydrochloride (2.53 g, 26 mmol), N-methylmorpholine (2.85 mL, 26 mmol) and 4-dimethylaminopyridine (198 mg, 2 mmol) in dichloromethane (50 mL) and DMF (10 mL) was cooled to 0° C. Then 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide (3.73 g, 19 mmol) was added and the reaction mixture was stirred at room temperature for 2 h. The reaction mixture was poured into hydrochloric acid (1 N ) and extracted with ethyl acetate. The combined organic layers were then washed with a saturated solution of sodium hydrogen carbonate, brine and then dried over sodium sulphate and evaporated to leave a light yellow oil. Purification by chromatography (SiO2, heptane:ethyl acetate=100:0 to 50:50) afforded the title compound (4.03 g, 91%) which was obtained as a courses oil. MS: m/e=273.0 [M+H]+.

Provenance & Evidence