Triazinone (I) was alkylated with 1-bromo-4-chlorobutane (II) in the presence of NaH to give the (chlorobutyl)triazinone (III). Subsequent hydrolysis of (III) with boiling 2 N HCl provided triazinedione (IV). Finally, condensation of (IV) with 1-(2-pyrimidinyl)piperazine (V) yielded the title compound.