Used as a key intermediate in the synthesis of antiviral agents, particularly in the development of hepatitis C virus (HCV) NS5A inhibitors. Its chiral structure enables selective interactions with biological targets, enhancing drug efficacy. The compound plays a critical role in constructing complex pharmacophores due to its phosphoramidate and quinoline functionalities, which improve cell permeability and metabolic stability. It is also employed in prodrug strategies to optimize bioavailability of active therapeutics.