A mixture of 2-(3-methoxyphenyl)cyclohexanone (I), pyrrolidine (II) and formic acid is heated at 130-40 C to give cis-2-(3-methoxyphenyl)-1-pyrrolidylcyclohexane (III), which is demethylated with refluxing HBr (47%) giving cis-2-(3-hydroxyphenyl)-1-pyrrolidylcyclohexane (IV). Finally this tertiary amine is quaternized with CH3Br.