N-(3-Chlorophenyl)piperazine (I) is alkylated with 1-bromo-2-chloroethane in the presence of NaOH in DMSO to afford the (2-chloroethyl)piperazine (II). Subsequent condensation of alkyl chloride (II) with 4,5,6,7-tetrahydro-1H-indol-4-one (III) gives rise to the title compound