[C:1]1([CH2:7][CH2:8][C:9]#[N:10])[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1.O1CCCC1.C[Si]([N-][Si](C)(C)C)(C)C.[Li+].[Si:26]([O:33][CH2:34][CH2:35]I)([C:29]([CH3:32])([CH3:31])[CH3:30])([CH3:28])[CH3:27]>C(OCC)(=O)C.CCCCCC>[Si:26]([O:33][CH2:34][CH2:35][CH:8]([CH2:7][C:1]1[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1)[C:9]#[N:10])([C:29]([CH3:32])([CH3:31])[CH3:30])([CH3:28])[CH3:27]
Combine 3-phenylpropionitrile (2.0 g, 15.25 mmol) and tetrahydrofuran (15 mL). Cool to −78° C. using a dry-ice/acetone bath. Add a solution of lithium bis(trimethylsilyl)amide (16.0 mL, 1 M in THF, 16.0 mmol). After 1 hour, add 2-(t-butyldimethylsilyloxy)ethyl iodide (4.58 g, 16.0 mmol). After the addition of 2-(t-butyldimethylsilyloxy)ethyl iodide is complete, warm slowly to ambient temperature over about 7 hours. Add water and extract twice with ethyl acetate. Dry the combined organic layers over Na2SO4, filter, and concentrate in vacuo to obtain a residue. Chromatograph the residue on silica gel eluting with 5% ethyl acetate/hexane to give the title compound: Rf=0.50 (silica gel, 10% ethyl acetate/hexane).
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