Ethyl 3-chloro-3-oxopropionate → Ethyl 2-(3-(2,5-difluorophenyl)-1,2,4-oxadiazol-5-yl)acetate

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Reaction Steps

Ethyl 3-chloro-3-oxopropanoate (1.7 mL; 13.2 mmol) was added to 2,5-difluoro-N′-hydroxybenzenecarboximidamide (JRD-Fluorochemical, 1.13 g; 0.6 mmol) in pyridine (30 mL). The mixture was heated to reflux for 4 hours and the solvent removed in vacuo. The residue was taken up into DCM (20 mL) and washed with water (10 mL). The organic phase was passed through a hydrophobic frit and the solvent removed in vacuo. The residue was purified on a Biotage 25+M column, eluting with petrol containing increasing amounts of EtOAc to give ethyl 2-(3-(2,5-difluorophenyl)-1,2,4-oxadiazol-5-yl)acetate (1.24 g, 70%).

Provenance & Evidence