Tetrahydrofuran → 4-Fluoro-N-[2-(5-methyl-2-furanyl)ethyl]benzamide

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4-Fluorophenylacetyl chloride (0.290 mL, 2.44 mmol) was added dropwise to a solution of β-(5-methyl-2-furanyl)ethanamine (300 mg, 2.44 mmol, made according to the procedure of Yur'ev et al. J. Gen. Chem. USSR (Engl. Transl.) 33, 3444–8 (1963)) in THF (2.5 mL) at rt, followed by the dropwise addition of Et3N (0.340 mL, 2.44 mmol). Once the starting material was consumed, as was evident by HPLC, the reaction was quenched with H2O and extracted with CH2Cl2. The combined organic layers were dried over MgSO4 and concentrated under reduced pressure. Purification by flash chromatography on silica gel eluting with a gradient of 0–50% EtOAc/hexane gave 523 mg (95%) of compound 237A as a white solid. HPLC: 99% at 2.84 min (retention time) (Phenomenex-prime S5-C18 column 4.6×50 mm eluting with 1090% aqueous methanol over 4 minutes containing 0.2% phosphoric acid, 4 mL/min, monitoring at 220 nm). MS (ES): m/z 248.15 [M+H]+.

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