Trifluoroacetic acid → (S)-2-[4-(3-aminopropoxy)-2,6-dichlorobenzoylamino]-3-[4-(2,6-dichlorobenzoylamino)phenyl]propionic acid methyl ester

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To a solution of (S)-2-[4-(3-tert-butoxycarbonylaminopropoxy)-2,6-dichlorobenzoylamino]-3-[4-(2,6-dichlorobenzoylamino)phenyl]propionic acid methyl ester (7.5 g, 7.98 mmol) in dichloromethane (100 mL) was added an excess of TFA (9.12 g, 5.9 mL, 80 mmol) at room temperature. The resulting solution was stirred for 15 h. Then, the solvent was removed under vacuum and the residue was azeotrophed one time with toluene. After drying under high vacuum, 5.8 g (99%) of (S)-2-[4-(3-aminopropoxy)-2,6-dichlorobenzoylamino]-3-[4-(2,6-dichlorobenzoylamino)phenyl]propionic acid methyl ester was obtained as a white solid. ES(+)-HRMS m/e calcd. for C27H25Cl4N3O5 (M+H)+ 612.0621, obsd. 612.0619.

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