[C:1]([O:5][C:6]([N:8]1[CH2:12][CH2:11][CH:10]([N:13]([CH2:19][C:20]2[CH:25]=[CH:24][C:23]([Cl:26])=[CH:22][CH:21]=2)[CH2:14][C:15]([O:17]C)=[O:16])[CH2:9]1)=[O:7])([CH3:4])([CH3:3])[CH3:2]>CO.[OH-].[Na+]>[C:1]([O:5][C:6]([N:8]1[CH2:12][CH2:11][CH:10]([N:13]([CH2:14][C:15]([OH:17])=[O:16])[CH2:19][C:20]2[CH:21]=[CH:22][C:23]([Cl:26])=[CH:24][CH:25]=2)[CH2:9]1)=[O:7])([CH3:4])([CH3:2])[CH3:3]A solution of 3-[(4-chloro-benzyl)-methoxycarbonylmethyl-amino]-pyrrolidine-1-carboxylic acid tert-butyl ester (0.5 g, 1.31 mmol) in methanol (4.00 mL) and 1.0 N NaOH (aqueous) (4.00 mL) was heated to reflux at 80° C. for 2.5 h. The reaction mixture was concentrated, acidified to pH 5.0 using 1.0 N HCl and extracted with dichloromethane(3×). The product was used for the next step without further purification. ESI-MS m/z: 369(M+1), UV retention time: 1.85 min.
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