1-(4-Fluorophenyl)piperazine → {6-Fluoro-4-[4-(4-fluoro-phenyl)-piperazine-1-carbonyl]-3-methyl-naphthalen-2-yl}-acetic acid methyl ester

Participants

Reaction Steps

To a solution of 7-fluoro-3-methoxycarbonylmethyl-2-methyl-naphthalene-1-carboxylic acid (27.6 mg, 0.10 mmol) and 1-(4-fluoro-phenyl)-piperazine (19.8 mg, 0.11 mmol) in N,N-dimethylformamide (2 mL) was added bromo-tris-pyrrolidino phosphonium hexafluorophosphate (46.6 mg, 0.10 mmol) and N,N-diisopropylethylamine (34.7 μL, 0.20 mmol). After being stirred at room temperature for 24 hours, the resulting mixture was diluted with ethyl acetate (10 mL), and washed with 1N hydrochloric acid (10 mL), a saturated aqueous solution of sodium carbonate (10 mL), and brine (10 mL). The resulting organic phase was dried over sodium sulfate, filtered, and concentrated in vacuo. The residue was purified by column chromatography (gradient elution with 20-40% ethyl acetate in petroleum ether) to afford {6-fluoro-4-[4-(4-fluoro-phenyl)-piperazine-1-carbonyl]-3-methyl-naphthalen-2-yl}-acetic acid methyl ester (36.2 mg, 83%) as a white solid.

Provenance & Evidence