[CH3:1][O:2][C@@H:3]1[CH2:7][NH:6][C@H:5]([C:8]([OH:10])=[O:9])[CH2:4]1.[C:11]([S:14][CH2:15][CH2:16][CH2:17]Cl)(=[O:13])[CH3:12].C(=O)([O-])[O-:20].[Na+].[Na+]>>[C:11]([S:14][CH2:15][CH2:16][C:17]([N:6]1[CH2:7][C@@H:3]([O:2][CH3:1])[CH2:4][C@H:5]1[C:8]([OH:10])=[O:9])=[O:20])(=[O:13])[CH3:12]Following the procedure of Example 1 (d), cis-4-methoxy-L-proline is treated with a solution of 3-acetylthiopropyl chloride in the presence of sodium carbonate to yield 1-(3-acetylthio-1-oxopropyl)-cis-4-methoxy-L-proline.
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