Sodium Bicarbonate → Ethyl alpha-fluoro-4-chlorophenylacetate

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(4-Chlorophenyl)-hydroxy-acetic acid ethyl ester (10.0 g, 46.6 mmol) in DCM (35 mL) was cannulated into a solution of [bis(2-methoxyethyl)amino]sulfur trifluoride (9.45 mL, 51.3 mmol) in DCM (35 mL) cooled at −78° C. After being stirred for 12 hours and allowed to warm to ambient temperature, the mixture was poured into saturated aqueous NaHCO3. The mixture was extracted with DCM and the organic extracts were dried (MgSO4), filtered, and concentrated in vacuo. The crude material was chromatographed (SiO2) using DCM as eluent to give (4-chlorophenyl)-fluoroacetic acid ethyl ester as a colorless oil (7.0 g).

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