3-Hydroxybenzaldehyde → 1-(3-Hydroxybenzyl)piperidine

Participants

Reaction Steps

In 800 ml of ethanol was dissolved 122 g of 3-hydroxybenzaldehyde and thereto was gradually added 210 g of piperidine. To the mixture was added 38 g of sodium borohydride under cooling with ice and the mixture was stirred for 8 hours at room temperature. The resulting mixture was concentrated at a reduced pressure. To a residue were added ice-cold water and hydrochloric acid to render a solution acidic. The solution was washed with diethyl ether. An aqueous layer was made alkaline with addition of sodium carbonate and then extracted with ethyl acetate. After removing the solvent, 106 g (yield 55%) of 3-(1-piperidinomethyl)phenol was obtained in the form of white crystal.

Provenance & Evidence