2-Naphthoyl chloride → L-Proline, 1-(3-((4-amino-2-((2-naphthalenylcarbonyl)amino)-1,4-dioxobutyl)amino)-2-hydroxy-4-phenylbutyl)-, 1,1-dimethylethyl ester, (2R-(2R*,3S*(S*)))-

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A solution of 249 mg of N-[3(S)-[[L-asparaginyl]amino]-2(R)-hydroxy-4-phenylbutyl]-L-proline tert.butyl ester, 106 mg of 2-naphthoyl chloride and 72 mg of diisopropylethylamine in 10 ml of dry dichloromethane was stirred at 20° C. for 20 hours. The gelatinous reaction mixture was partitioned between dichloromethane and water. The organic phase was evaporated and the resulting oil was crystallized from ethyl acetate/n-hexane to give 215 mg of N-[2(R)-hydroxy-3(S)-[[N-(2-naphthoyl)-L-asparaginyl]amino]-4-phenylbutyl]-L-proline tert.butyl ester, as a white solid; MS: m/e 603 [M+H]+.

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