By condensation of alpha,alpha-diphenyl-4-piperidinemethanol (I) with 1-(p-tert-butylphenyl)-4-chlorobutanol (II) by means of KHCO3 and KI in refluxing toluene.
By condensation of alpha,alpha-diphenyl-4-piperidinemethanol (I) with 4'-chloro-p-tert-butyl-butyrophenone (III) by means of KHCO3 to give p-tert-butyl-4'-[4-(alpha-hydroxydiphenylmethyl)-1-piperidyl]butyrophenone (IV), which is then reduced with H2 and a catalyst.