Are there alternatives to 3-(4-Chlorophenyl)-2-piperazinone (CAS: 86147-28-6) in synthesis?

Several alternatives to 3-(4-Chlorophenyl)-2-piperazinone (CAS: 86147-28-6) exist in synthesis, including 4-chloro-2-piperazinone and 3-(phenyl)-2-piperazinone. These alternatives can serve as precursors or reactants in similar chemical processes. However, the choice of alternative depends on the specific reaction conditions and desired product characteristics. Commonly used reagents like piperazine and chlorophenol can also be considered as substitutes.