Benzoic acid, 4-fluoro-, ethyl ester → Ethyl 4-((3S,5R)-3,5-dimethylpiperazin-1-yl)benzoate

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Reaction Conditions

Reaction Steps

(2S,6R)-2,6-dimethylpiperazine (6.85 g, 60.00 mmol) was added to ethyl-4-fluorobenzoate (2.20 mL, 15 mmol), in DMSO (40 mL) and warmed to 120° C. under nitrogen. The resulting solution was stirred at 120° C. for 20 h. The reaction mixture was cooled and the solvent evaporated. The crude product was purified by silica column chromatography, eluting with a gradient of 0 to 10% methanol in dichloromethane containing 1% 0.880 ammonia. Pure fractions were evaporated to dryness to afford ethyl 4-((3R,5S)-3,5-dimethylpiperazin-1-yl)benzoate (2.83 g, 71.9%) as a brown oil, which solidified on standing.

Provenance & Evidence