Dichloromethane → Ethyl 3-(benzyloxy)-4-oxopiperidine-1-carboxylate

Participants

Reaction Steps

To a stirred mixture of 10 parts of 3-(phenylmethoxy)-1-(phenylmethyl)-4-piperidinone and 65 parts of dichloromethane were added dropwise 5 parts of ethyl carbonochloridate at room temperature. After stirring for 6.30 hours at reflux, there were added 5 parts of N,N-diethylethanamine. Upon completion, stirring at reflux was continued for 24 hours. The reaction mixture was washed successively with water, a diluted hydrochloric acid solution and again with water, dried, filtered and evaporated. The residue was purified by column-chromatography over silica gel using a mixture of trichloromethane and methanol (95:5 by volume) as eluent. The pure fractions were collected and the eluent was evaporated, yielding 8.1 parts (86.5%) of ethyl 4-oxo-3-(phenylmethoxy)-1-piperidinecarboxylate as an oily residue (intermediate 47).

Provenance & Evidence