[C:1]([NH:11][C@H:12]([C:15]([OH:17])=[O:16])[CH2:13]Cl)([O:3][CH2:4][C:5]1[CH:10]=[CH:9][CH:8]=[CH:7][CH:6]=1)=[O:2].C(=O)([O-])[O-].[Na+].[Na+].[C:24]1([SH:30])[CH:29]=[CH:28][CH:27]=[CH:26][CH:25]=1.Cl>O>[C:1]([NH:11][C@H:12]([C:15]([OH:17])=[O:16])[CH2:13][S:30][C:24]1[CH:29]=[CH:28][CH:27]=[CH:26][CH:25]=1)([O:3][CH2:4][C:5]1[CH:10]=[CH:9][CH:8]=[CH:7][CH:6]=1)=[O:2]
N-Carbobenzyloxy-β-chloro-L-alanine (0.108 g, 0.42 mmol) was dissolved in 0.5 ml of water and, then, 0.097 g (0.92 mmol) of sodium carbonate was added. Thereafter, 0.054 g (0.50 mmol) of thiophenol was added dropwise at room temperature in a nitrogen gas atmosphere. After 2 hours of stirring at 60° C., the reaction mixture was cooled with ice and acidified with 1 N hydrochloric acid, and then extracted with ethyl acetate. The solvent was distilled off and the residue was purified by column chromatography to give 0.112 g (0.34 mmol, 81%) of N-carbobenzyloxy-S-phenyl-L-cysteine. The compound obtained had an optical purity of not less than 98% e.e. The optical purity was determined by HPLC. The analytical conditions are shown below.
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