Potassium Hydroxide → rac-(3R,4R)-4-(benzylamino)piperidin-3-ol

Participants

Reaction Steps

A mixture of 195.4 parts of potassium hydroxide and 1065 parts of 2-propanol was stirred and warmed till all solid entered solution. After cooling to room temperature, 97 parts of ethyl trans-3-hydroxy-4-[(phenylmethyl)amino]-1-piperidinecarboxylate were added and the whole was stirred and refluxed for 4 hours. The reaction mixture was evaporated to dry and 500 parts of water were added. The whole was concentrated to a volume of about 300 parts. After cooling to room temperature, the product was extracted with dichloromethane. The extract was washed with water, dried, filtered and evaporated. The oily residue was crystallized from acetonitrile. The product was filtered off and dried, yielding 51 parts (70.8%) of trans-4-[(phenylmethyl)amino]-3-piperidinol; mp. 136° C.(intermediate 39).

Provenance & Evidence