Hydrochloric Acid → HCID 23326050, compound

Participants

Reaction Conditions

Reaction Steps

A mixture of 50.9 parts of α,α-bis(4-fluorophenyl)-1,2,3,6-tetrahydro-1-(phenylmethyl)-4-pyridinemethanol, 320 parts of methanol and 800 parts of a hydrochloric acid solution 1N was stirred first for 3 hours at reflux temperature and then for 56 hours at room temperature. The whole was evaporated till all traces of methanol were removed. The free base was liberated with ammonium hydroxide. The product was extracted with 1040 parts of dichloromethane. The extract was washed with 100 parts of water, dried, filtered and evaporated. The residue was dissolved in 270 parts of N,N-dimethylformamide. The whole was heated to 60° C. 2.5 Parts of a sodium hydride dispersion 50% were added at 80° C. After stirring for 1 hour at 80° C., the mixture was cooled to room temperature. 9 Parts of iodomethane were added dropwise. Upon completion, the whole was stirred and heated for 30 minutes at 40° C. After cooling, the reaction mixture was poured onto 2000 parts of ice-water. The product was extracted twice with 450 parts of methylbenzene. The combined extracts were dried, filtered and evaporated. The oily residue was purifid by column-chromatography over silica gel using a mixture of trichloromethane and methanol (98:2 by volume) as eluent. The pure fractions were collected and the eluent was evaporated, yielding 29.6 parts (57%) of 4-[bis(4-fluorophenyl)methylene]-3-methoxy-1-(phenylmethyl)piperidine as a residue (intermediate 29).

Provenance & Evidence