Used as a chiral building block in the synthesis of pharmaceuticals, particularly in the development of biologically active compounds where stereochemistry plays a critical role. Its protected amine group and defined stereochemistry make it valuable in asymmetric synthesis, enabling the construction of complex molecules such as protease inhibitors, kinase inhibitors, and other therapeutic agents. Commonly employed in medicinal chemistry for structure-activity relationship (SAR) studies due to its rigid pyrrolidine scaffold and ability to influence potency, selectivity, and metabolic stability in drug candidates.