[CH3:1][O:2][C:3](=[O:18])[CH:4]([C:11]1[CH:16]=[CH:15][C:14](Br)=[CH:13][CH:12]=1)[CH2:5][CH:6]1[CH2:10][CH2:9][CH2:8][CH2:7]1.[Cu][C:20]#[N:21].[OH-].[NH4+]>CN(C)C=O.O>[CH3:1][O:2][C:3](=[O:18])[CH:4]([C:11]1[CH:16]=[CH:15][C:14]([C:20]#[N:21])=[CH:13][CH:12]=1)[CH2:5][CH:6]1[CH2:10][CH2:9][CH2:8][CH2:7]1A solution of 2-(4-bromo-phenyl)-3-cyclopentyl-propionic acid methyl ester (500 mg, 1.60 mmol) in N,N-dimethylformamide (4.01 mL) was treated with copper(I) cyanide (144 mg, 1.60 mmol). The mixture was heated at 170° C. for 1 h. At this time, the reaction was cooled to 25° C. and poured into aqueous ammonium hydroxide (5 mL). The solution was diluted with water (25 mL) and extracted with ethyl acetate (3×35 mL). The combined organic layers were dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 90/10 hexanes/ethyl acetate) afforded 2-(4-cyano-phenyl)-3-cyclopentyl-propionic acid methyl ester (65.6 g, 15.8%) as a clear oil: EI-HRMS m/e calcd for C16H19NO2 (M+) 257.1415 found 257.1406.
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