Potassium Carbonate → 3-(R, S)-(1-cyano-1,1-diphenylmethyl)-1-(3,4-methylenedioxybenzyl)piperidine

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A mixture containing 3-(R,S)-(1-cyano-1,1-diphenylmethyl)piperidine (0.27 g), 3,4-methylenedioxybenzyl chloride (0.18 g), anhydrous potassium carbonate (0.3 g) and acetonitrile (10 ml) was heated under reflux for 16 hours. The mixture was partitioned between dichloromethane (30 ml) and 10% aqueous sodium carbonate (30 ml), the layers separated, and the aqueous layer extracted with dichloromethane (2×30 ml). The combined dichloromethane extracts were dried (MgSO4) and concentrated in vacuo to give a gum which was purified by column chromatography on silica eluting with dichloromethane containing methanol (0% up to 2%). The product-containing fractions were combined and concentrated in vacuo to give the title compound as a colourless solid, yield 0.2 g, m.p. 127°-130° C.

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