Condensation of bis(4-fluorophenyl)methyl 2-chloroethyl ether (I) with piperazine (II) in refluxing toluene afforded the monosubstituted piperazine (III). This was then alkylated with (3-bromopropyl)benzene (IV) in boiling EtOH to furnish the title compound.
1-(3-Phenylpropyl)piperazine (III) has been obtained by condensation of 3-phenylpropyl bromide (I) with piperazine (II) in refluxing acetonitrile. The condensation of bis(4-fluorophenyl)methanol (IV) with 2-chloroethanol (V) by means of sulfuric acid gives the 2-chloroethyl bis(4-fluorophenyl)methyl ether (VI), which si treated with NaI to yield the corresponding iodo derivative (VII). Finally this compound is condensed with the intermediate piperazine (III) by means of aq. Na2CO3 to afford the target disubstituted piperazine.