[CH3:1][O:2][C:3](=[O:20])[CH:4]([C:12]1[CH:17]=[CH:16][C:15]([Cl:18])=[C:14]([Cl:19])[CH:13]=1)[CH2:5][CH:6]1[CH2:10][CH2:9][CH:8]([OH:11])[CH2:7]1.I[CH3:22]>C(#N)C.C(=O)([O-])[O-].[Ag+2].F[B-](F)(F)F.[Ag+]>[CH3:1][O:2][C:3](=[O:20])[CH:4]([C:12]1[CH:17]=[CH:16][C:15]([Cl:18])=[C:14]([Cl:19])[CH:13]=1)[CH2:5][CH:6]1[CH2:10][CH2:9][CH:8]([O:11][CH3:22])[CH2:7]1A solution of 2-(3,4-dichloro-phenyl)-3-(3-hydroxy-cyclopentyl)-propionic acid methyl ester (prepared as in Example 36, 194.1 mg, 0.61 mmol), silver carbonate (320.6 mg, 1.16 mmol), silver tetrafluoroborate (131.0 mg, 0.67 mmol), and iodomethane (72 μL, 1.16 mmol) in acetonitrile (6.1 mL) was stirred at 25° C. for 48 h. The resulting reaction mixture was then heated under reflux for 24 h. The reaction mixture was then filtered through a pad of celite, and the celite pad was washed well with ethyl acetate. The filtrate was concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 10% ethyl acetate/hexanes) afforded 2-(3,4-dichloro-phenyl)-3-(3-methoxy-cyclopentyl)-propionic acid methyl ester (68.8 mg, 34%) as a yellow oil which was used without further purification.
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