[ClH:1].[CH3:2][O:3][C:4](=[O:15])[C@H:5]([CH3:14])[NH:6][C:7]1C=CC(Cl)=CC=1.Cl.CN(C)CCCN=C=NCC.[OH2:28].ON1[C:34]2[CH:35]=[CH:36][CH:37]=[CH:38][C:33]=2N=N1.CN1CCOCC1>C(Cl)Cl.C(O)=O>[Cl:1][C:33]1[CH:38]=[CH:37][C:36]([CH2:14][CH:5]([NH:6][CH:7]=[O:28])[C:4]([O:3][CH3:2])=[O:15])=[CH:35][CH:34]=1(±)-(4-Chlorophenyl)alanine methyl ester hydrochloride (2.00 g) was suspended in methylene chloride (20 ml), and 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (1.60 g), 1-hydroxybenzotriazole monohydrate (1.23 g), N-methylmorpholine (1.90 ml) and formic acid (0.30 ml) were added to stir the mixture for 15 minutes. After a process in which formic acid (0.30 ml) was additionally added to stir the mixture for 15 minutes was repeated 3 times, the reaction mixture was diluted with methylene chloride. After an ogranic layer was washed with water and then dried over anhydrous sodium sulfate, the solvent was distilled off under reduced pressure. The residue was purified by column chromatography on silica gel (methylene chloride:methanol=40:1) to obtain the title compound (1.21 g).
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