[H-].[Na+].[F:3][C:4]([F:15])([F:14])[C:5]1[CH:10]=[CH:9][C:8]([CH2:11][C:12]#[N:13])=[CH:7][CH:6]=1.Br[CH2:17][CH2:18][CH2:19][CH2:20]Br.Cl>CS(C)=O.CS(C)=O.CCOCC.O>[F:3][C:4]([F:14])([F:15])[C:5]1[CH:6]=[CH:7][C:8]([C:11]2([C:12]#[N:13])[CH2:20][CH2:19][CH2:18][CH2:17]2)=[CH:9][CH:10]=1
To a suspension of NaH (8.18 g, 135.13 mmol, 60%) in dimethyl sulfoxide (100 mL) were added dropwise a mixture of (4-trifluoromethyl-phenyl)-acetonitrile (236) (25 g, 135.13 mmol) and 1,4-dibromobutane (16 mL, 135.13 mmol) dissolved in dimethyl sulfoxide:ether (1:1) (300 mL) at 0° C. and the reaction mixture was stirred at this temperature for 2 h. After completion of the reaction, water (100 mL) and 10% HCl solution (50 mL) were added to the mixture and extracted with ethyl acetate (2×400 ml). The organic layer was dried over Na2SO4, concentrated and purified by 100-200 silica column chromatography using hexane as the eluent to give 1-(4-trifluoromethyl-phenyl)-cyclopentanecarbonitrile (237) (21 g, 65%) as a colorless liquid.
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