Used as an intermediate in the synthesis of pharmaceutical compounds, particularly in the development of active pharmaceutical ingredients (APIs) that require a piperazine moiety linked to an aromatic ester. Its structure allows for selective modifications, making it valuable in drug discovery for central nervous system agents, antipsychotics, and antihistamines. The tert-butyl ester group serves as a protecting group, enabling controlled deprotection during multi-step syntheses. It is also employed in the preparation of receptor ligands and bioactive molecules where solubility and stability of the piperazine ring are important.