4-(2-Bromoethyl)phenol → 3-(r,s)-(1-Carbamoyl-1,1-diphenylmethyl)-1-(4-hydroxyphenethyl)piperidine

Participants

Reaction Steps

A mixture containing 3-(R,S)-(1-carbamoyl-1,1-diphenylmethyl)piperidine (0.3 g), 4-hydroxyphenethyl bromide (0.21 g), sodium bicarbonate (0.3 g) and acetonitrile (15 ml) was heated under reflux for 5 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 (2×50 ml). The combined dichloromethane extracts were dried (MgSO4) and concentrated in vacuo to give a gum which was purified by column chromatography, firstly on silica eluting with dichlorometbane containing methanol (0% up to 6%), and then on alumina eluting with dichloromethane containing methanol (0% up to 10%). The product-containing fractions were combined and concentrated in vacuo to give the title compound as colourless microcrystals, yield 0.042 g, m.p. 135°-140° C.

Provenance & Evidence