F[C:2]1[CH:9]=[CH:8][C:5]([C:6]#[N:7])=[CH:4][CH:3]=1.[CH3:10][O:11][CH2:12][CH2:13][CH2:14][CH2:15][CH2:16][O:17][CH:18]1[CH2:23][CH2:22][NH:21][CH2:20][CH2:19]1.C(=O)([O-])[O-].[K+].[K+].O>CN(C=O)C>[CH3:10][O:11][CH2:12][CH2:13][CH2:14][CH2:15][CH2:16][O:17][CH:18]1[CH2:19][CH2:20][N:21]([C:2]2[CH:9]=[CH:8][C:5]([C:6]#[N:7])=[CH:4][CH:3]=2)[CH2:22][CH2:23]1A solution of 4-fluorobenzonitrile (0.38 g), 4-(5-methoxypentyloxy)piperidine (0.62 g) and potassium carbonate (0.87 g) in DMF (8 ml) was stirred at 90-95° C. for 6 hours. The reaction mixture was poured into water (50 ml) and extracted twice with a mixture of ethyl acetate and n-hexane (50 ml:20 ml). The extracts were combined, washed with saturated aqueous sodium chloride, dried over magnesium sulfate and evaporated in vacuo. The resulting residue was chromatographed on silica gel (100 ml) eluting with a mixture of n-hexane and ethyl acetate (5:1 v/v-2:1 v/v). The fractions containing the desired compound were collected and evaporated under reduced pressure to give 4-(5-methoxypentyloxy)-N-(4-cyanophenyl)piperidine (294 mg).
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