Used as a chiral building block in pharmaceutical synthesis, particularly in the development of active pharmaceutical ingredients where stereochemistry plays a critical role in biological activity. Its piperazine backbone is common in drugs targeting central nervous system disorders, including antidepressants and antipsychotics. The (S)-enantiomer specificity makes it valuable for creating enantiomerically pure compounds, improving drug efficacy and reducing side effects. Also employed in the preparation of catalysts and ligands for asymmetric synthesis.