Potassium Carbonate → 3-(R)-(+)-(1-cyano-1,1-diphenylmethyl)-1-(4-hydroxymethylphenethyl)piperidine

Participants

Reaction Steps

A mixture containing 3(R)-(+)-(1-cyano-1,1,-diphenylmethyl)-piperidine (0.28 g), 4- hydroxymethylphenethyl bromide (0.22 g), anhydrous potassium carbonate (0.28 g) and acetonitrile (10 ml) was heated under reflux for 5 hours. The mixture was partitioned between dichloromethane (30 ml) and 10% aqueous potassium carbonate (20 ml), the layers separated, and the aqueous layer extracted with dichloromethane (2×20 ml). The combined dichloromethane extracts were dried (MgSO4) and concentrated in vacuo to give an oil which was purified by column chromatography on silica eluting with hexane containing dichloromethane (30% up to 70%) then dichloromethane containing methanol (0% up to 5%). The product-containing fractions were combined and concentrated in vacuo to give an oil which was crystallised from acetonitrile to give the title compound as colourless rhombs, yield 0.21 g, m.p. 110-114° C., [α]D25 -16.2° (c, 1.0, CH2Cl2).

Provenance & Evidence