Ethyl 4-oxo-1-piperidinecarboxylate → HCID 14770818, compound

Participants

Reaction Conditions

Reaction Steps

A solution of 16.55 g (60.85 mmol) 1,4-dibromo-2,5-difluorobenzene in 400 ml of ethyl ether stirred at -75° C. under an argon atmosphere was treated dropwise with 24.3 ml of 2.5 M n-butyl lithium in hexane. The mixture was let warm to -50° C. and treated dropwise with a solution of 11.00 g (64.33 mmol) 1-ethoxycarbonyl-4-piperidone in 100 ml ethyl ether. After stirring a further 0.25 hour, the mixture was let warm to room temperature and extracted with ammonium chloride solution. The organic layer was dried (MgSO4), evaporated and the crude product chromatographed on a silica gel column and crystallized from toluene hexane to afford the title compound, mp 133°-136° C.

Provenance & Evidence