Triethylamine → N-[3-[N-(2-phenylethyl)carbamoyl]propanoyl]-L-prolinol

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3-[N-(2-phenylethyl)carbamoyl]propionic acid (400 mg) was dissolved into dry THF (4 ml). Triethylamine (0.32 ml) and ethyl chloroformate (0.15 ml) secondary were dropped into the solution with stirring at 0° C. After 10 mins' stirring, a solution of L-prolinol (199 mg) in THF (2 ml) was added to the solution, and the solution was stirred for 30 mins at 0° C. and for another 30 mins at room temperature. Water was added to the diluted solution with ethyl acetate. The oily layer was washed with 1N hydrochloric acid, a saturated aqueous solution of sodium hydrocarbonate, a saturated brine, successively, dried and then evaporated. The residue was purified by column chromatography on silica gel to give the title compound (490 mg).

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