Used as a chiral building block in the synthesis of pharmaceuticals, particularly in the development of antiviral and antidiabetic agents. The Boc-protected pyrrolidine nitrogen, along with the free amine and hydroxyl groups at positions 3 and 4, enable selective functionalization, making it valuable in asymmetric synthesis. Commonly employed in the preparation of protease inhibitors and other bioactive molecules where stereochemistry is critical for activity.