Water → 1-(Benzyloxycarbonyl)-4-phenylpiperidine-4-carboxylic acid

Participants

Reaction Conditions

Reaction Steps

A mixture of 37.7 g of 4-carboxy-4-phenylpiperidine p-toluenesulfonate, 53.3 g of 30% aqueous NaOH solution and 250 ml of water is cooled to 5° C. A solution of 18 g of benzyl chloroformate in 60 ml of acetone is added rapidly at 5° C. and the reaction mixture is stirred overnight while the temperature is allowed to rise to RT. It is washed twice with ether and, after decantation, the aqueous phase is acidified to pH 1 by the addition of concentrated HCl and then 2N HCl. The precipitate formed is wrung, dried, taken up with ether and wrung again to give 30.6 g of the expected product. M.p.=142°-144° C.

Provenance & Evidence