1-Ethyl-3-(3'-dimethylaminopropyl)carbodiimide → Di-tert-butyl 4-(3-((6-chloro-2-naphthyl)sulfonyl)propanoyl)piperazine-1,3-dicarboxylate

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Reaction Steps

3-((6-Chloro-2-naphthyl)sulfonyl)propanoic acid (0.33 g), HOBt (2.30 g) and WSC (2.88 g) were added to acetonitrile (50 mL) and mixed for 15 minutes. Then, di-tert-butyl piperazine-1,3-dicarboxylate (2.99 g) and triethylamine (3.03 g) were added thereto, and the mixture was mixed at room temperature for 15 hours. The reaction solution was concentrated under reduced pressure, and the residue was diluted with ethyl acetate and an aqueous potassium carbonate solution. The organic layer was collected by separation, and dried over anhydrous sodium sulfate. The solvent was distilled off, and the residue was purified with a silica gel column to give the title compound (2.40 g) as a colorless powder.

Provenance & Evidence