tert-Butyl piperazine-1-carboxylate → (2R, 5S)-4-(5-Chloro-2-{2-[4-(4-fluoro-benzyl)-2,5-dimethyl-piperazin-1-yl]-2-oxo-ethoxy}-benzoyl)-piperazine-1-carboxylic acid tert-butyl ester

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Reaction Steps

To a solution of (2R, 5S)-5-chloro-2-{2-[4-(4-fluoro-benzyl)-2,5-dimethyl-piperazin-1-yl]-2-oxo-ethoxy}-benzoic acid (0.10 g, 0.212 mmol) in dichloromethane (4 ml) was added 4-dimethylaminopyridine (0.039 g, 0.318 mmol), 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (0.061 g, 0.318 mmol) and tert-butyl 1-piperazinecarboxylate (0.041 g 0.222 mmol). The resulting mixture was stirred overnight at ambient temperature. It was then diluted with dichloromethane and washed with brine. The organics were dried over magnesium sulfate, filtered and concentrated to give a clear oil. Chromatography on silica gel gave the title compound (0.110 g, 85% yield).

Provenance & Evidence