(4-Fluorobenzyl)triphenylphosphonium chloride → 4-(4-(4-Fluorobenzylidene)-1-piperidinyl)benzonitrile

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A suspension of the 4-fluorobenzyl triphenylphosphonium chloride (0.737 g, 1.81 mmol) in THF (10 mL) was treated with nBuLi (724 μL of a 1.6M solution in hexanes, 1.81 mmol) at 0° C., treated with 1-(4′-cyanophenyl)-4-oxopiperidine (prepared according to the procedure described in Synthesis 1981, 606-608, 0.300 g, 1.51 mmol), and gradually warmed to room temperature overnight. The reaction mixture was partitioned between ethyl acetate and saturated aqueous NH4Cl and the aqueous layer was extracted with ethyl acetate (2×). The combined organic layers were dried (MgSO4), filtered, and concentrated. The resulting residue was purified by silica gel chromatography eluting with 10% ethyl acetate in hexanes to give the desired product. (0.268 g, 61%). MS (ESI) m/e 292 (M+H)+.

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