[OH:1][C@H:2]1[CH2:6][CH2:5][NH:4][C@@H:3]1[C:7]([OH:9])=[O:8].CCN(C(C)C)C(C)C.Cl[C:20]([O:22][CH2:23][C:24]1[CH:29]=[CH:28][CH:27]=[CH:26][CH:25]=1)=[O:21]>CN(C=O)C>[CH2:23]([O:22][C:20]([N:4]1[CH2:5][CH2:6][C@H:2]([OH:1])[C@H:3]1[C:7]([OH:9])=[O:8])=[O:21])[C:24]1[CH:29]=[CH:28][CH:27]=[CH:26][CH:25]=1(2S,3S)-3-Hydroxy-pyrrolidine-2-carboxylic acid (254.5 mg, 1.9 mmol) was dissolved in DMF (15 mL) and distilled water (6 mL). The solution was cooled to 0° C., and DIEA (500 μL, 2.9 mmol) was added followed by benzyl chloroformate (410 μL, 2.9 mmol). The reaction was stirred at 0° C. and allowed to warm to ambient temperature overnight. The reaction was filtered and purified by reverse phase HPLC to give the desired product.
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