Ethyl propiolate → HCID 68327941, compound

Participants

Reaction Conditions

Reaction Steps

To a stirred solution of 5-(4-fluorophenyl)-1,3,4-oxathiazol-2-one (42.80 g, 217.1 mmol) in o-dichlorobenzene (600 mL) was added ethyl propiolate (66.0 mL, 651 mmol). The mixture was heated overnight at 135° C. and concentrated. The residual oil was purified by flash chromatography using a hexane/ethyl acetate gradient to afford ethyl 3-(4-fluorophenyl)isothiazole-5-carboxylate as a pale golden solid (17.35 g, 32%). The more polar, ethyl 3-(4-fluorophenyl)isothiazole-4-carboxylate isomer (generated in 57/43 ratio versus the desired product) was discarded.

Provenance & Evidence