Start with trifluoromethylbenzene and nitrate it in the 3-position. Reduce the nitro group to an amine. The 3-trifluoromethylaniline is then condensed with bis(chloroethyl)amine hydrochloride to give 3-trifluoromethylphenylpiperazine. Or you could buy it from an online supplier of research chemicals.
http://rhodium.lycaeum.org (http://rhodium.lycaeum.org)