[CH:1]1([CH2:6][C:7]([OH:9])=O)[CH2:5][CH2:4][CH2:3][CH2:2]1.Cl.[CH3:11][O:12][C:13](=[O:17])[C@H:14]([CH3:16])[NH2:15]>>[CH3:11][O:12][C:13](=[O:17])[C@H:14]([CH3:16])[NH:15][C:7](=[O:9])[CH2:6][CH:1]1[CH2:2][CH2:3][CH2:4][CH2:5]1Following General Procedure A above using cyclopentylacetic acid (Aldrich) and L-alanine methyl ester hydrochloride (Sigma), the title compound was prepared as a solid having a melting point of 43-46° C. Purification was by recrystallization from ethyl acetate/hexanes.
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