Water → HCID 68153075, compound

Participants

Reaction Conditions

Reaction Steps

A suspension of methyl 3-(4-chlorophenyl)-5-oxo-4,5-dihydroisoxazole-4-carboxylate (518 mg, 2.04 mmol; building block is commercially available) in POCl3 (3 mL) was cooled to 0-5° C., and upon stirring, Et3N (0.3 mL) was added dropwise. The resulting mixture was heated to 100-110° C. and stirred at this temperature for 2-2.5 h, cooled to room temperature, poured into iced water and neutralized with aqueous NaOH (10%). The product was extracted with ether and purified by column chromatography (hexane:EtOAc 25:2) to give 320 mg of a yellow solid. Yield 57%. 1H NMR (DMSO-D6, CCl4): 3.79 (3H, s, OCH3), 7.50 (2H, AB-syst., CH-arom.), 7.65 (2H, AB-syst., CH-arom.).

Provenance & Evidence