4-Bromoanisole → HCID 53726868, compound

Participants

Reaction Steps

To a stirred and refluxing Grignard-complex, previously prepared starting from 15 parts of magnesium, 112.2 parts of 1-bromo-4-methoxybenzene and 540 parts of tetrahydrofuran, was added dropwise a solution of 80 parts of ethyl 4-benzoyl-1-piperidinecarboxylate in 360 parts of tetrahydrofuran at reflux temperature. Upon completion, stirring was continued for 2 hours at reflux. After cooling overnight, the reaction mixture was poured onto a mixture of 300 parts of crushed ice and 40 parts of acetic acid at 10° C. After stirring for 15 minutes, the layers were separated. The organic layer was dried, filtered and evaporated. The residue was taken up in methylbenzene and the latter was evaporated. The residue was suspended three times in 70 parts of 2,2'-oxybispropane and the latter was decanted each time. The residue was evaporated to dry, yielding 106 parts of ethyl 4-[hydroxy(4-methoxyphenyl)phenylmethyl]-1-piperidinecarboxylate as a residue (intermediate 31).

Provenance & Evidence