Sodium hydride → 1-Methyl-3-phenylpiperidin-4-one

Participants

Reaction Steps

208.78 g of ethyl N-(2-ethoxycarbonylethyl)-3-methylamino-2-phenylpropionate, 10 ml of absolute alcohol and 500 ml of toluene are added to a suspension of 65.28 g of sodium hydride and 3.0 l of toluene. When hydrogen evolution slows (about 0.5 hour), the mixture is heated to reflux for 30 minutes. The reaction mixture is cooled and then extracted with 6 N hydrochloric acid. The resultant acid extracts are washed with 500 ml of hexane and heated to reflux under nitrogen for two hours. The mixture is then cooled, basified with 50 weight percent aqueous NaOH solution (1.6 l) and then extracted with ether. The ether extracts are dried over Na2SO4 and then filtered. The filtrate is concentrated in vacuo to yield an oil product of 1-methyl-3-phenyl-4-piperidone.

Provenance & Evidence