[CH2:1]([NH2:8])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.C(=O)([O-])[O-].[K+].[K+].[CH3:15][O:16][C:17](=[O:34])[C@H:18]([NH:29][C:30](=[O:33])[CH2:31]Cl)[CH2:19][C:20]1[CH:25]=[CH:24][C:23]([CH3:26])=[C:22]([O:27][CH3:28])[CH:21]=1.Cl>CN(C)C=O.ClCCl>[CH3:15][O:16][C:17](=[O:34])[C@H:18]([NH:29][C:30](=[O:33])[CH2:31][NH:8][CH2:1][C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1)[CH2:19][C:20]1[CH:25]=[CH:24][C:23]([CH3:26])=[C:22]([O:27][CH3:28])[CH:21]=1Benzylamine (1.65 g) and potassium carbonate (1.28 g) were added successively to a solution of (2R)-2-[N-(chloroacetyl)amino]-3-(3-methoxy-4-methylphenyl)propionic acid methyl ester (1.85 g) in N,N-dimethylformamide (15 ml) at 20° C. After being stirred at 35° C. for 1.5 hours, the mixture was poured into a mixture of ice-water (20 ml) and dichloromethane (20 ml). After the mixture was adjusted to pH 9 with diluted aqueous hydrochloric acid under stirring, the organic layer was separated, washed with brine (20 ml), dried over magnesium sulfate and evaporated under reduced pressure to give an oil of (2R)-2-[N-(benzylaminoacetyl)-amino]-3-(3-methoxy-4-methylphenyl)propionic acid methyl ester. A solution of (2R)-2-[N-(benzylaminoacetyl)amino]-3-(3-methoxy-4-methylphenyl)propionic acid methyl ester obtained by above procedure and acetic acid (0.18 ml) in isopropyl alcohol (10 ml) was stirred for 12 hours under reflux.
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