[C:1]([O:5][C:6](=[O:18])[NH:7][CH:8]([C:11]1[CH:16]=[CH:15][C:14]([F:17])=[CH:13][CH:12]=1)[CH2:9]I)([CH3:4])([CH3:3])[CH3:2].[CH3:19][O:20][C:21](=[O:24])[CH2:22][SH:23].C(=O)([O-])[O-].[K+].[K+]>CC(C)=O>[CH3:19][O:20][C:21](=[O:24])[CH2:22][S:23][CH2:9][CH:8]([NH:7][C:6]([O:5][C:1]([CH3:4])([CH3:3])[CH3:2])=[O:18])[C:11]1[CH:16]=[CH:15][C:14]([F:17])=[CH:13][CH:12]=1A mixture of [1-(4-fluoro-phenyl)-2-iodo-ethyl]-carbamic acid tert-butyl ester (3.88 g, 10.6 mmol), mercapto-acetic acid methyl ester (1.24 g, 11.7 mmol) and potassium carbonate (12.21 g, 18 mmol) in acetone (100 mL) was heated to reflux with stirring for 90 minutes. The mixture was then cooled and concentrated under reduced pressure. The residue was partitioned between water and ethyl acetate, and the organic layer was separated, washed with brine, dried (MgSO4), filtered and concentrated under reduced pressure. The residue was recrystallized from hexanes to give 3.34 g of [2-tert-Butoxycarbonylamino-2-(4-fluoro-phenyl)-ethylsulfanyl]-acetic acid methyl ester, MP=61-62° C.
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