Triethylamine → Ethyl 3-(4-chlorophenyl)-5-methylisoxazole-4-carboxylate

Participants

Reaction Steps

To a solution of (E)- and/or (Z)—N-hydroxy-4-chloro-benzenecarboximidoyl chloride (26.0 g, 137 mmol) in diethylether (323 mL) was added ethyl 2-butynoate (15.4 g, 16.1 mL, 137 mmol) at 0° C. followed by the dropwise addition of triethylamine (24.1 g, 22.9 mL, 164 mmol) and the resulting mixture allowed to warm up to room temperature overnight. The mixture was then poured onto ice-water, and extracted with diethylether. The combined organic layers were then washed with water and brine, dried over sodium sulfate and evaporated. Purification by chromatography (SiO2, heptane:ethyl acetate=100:0 to 1:1) afforded the title compound (15.2 g, 42%) which was obtained as a light yellow solid. MS: m/e=266.1 [M+H]+.

Provenance & Evidence