(S)-3-Aminotetrahydrofuran tosylate is primarily used in the pharmaceutical industry as a key intermediate in the synthesis of various active pharmaceutical ingredients (APIs). Its chiral structure makes it valuable in the production of enantiomerically pure compounds, which are crucial for drugs targeting specific biological pathways. This chemical is often employed in the development of antiviral and anticancer agents, where its unique stereochemistry enhances the efficacy and selectivity of the final drug product. Additionally, it serves as a building block in organic synthesis, particularly in the creation of complex molecules with tetrahydrofuran rings, which are common in many bioactive compounds. Its tosylate group also facilitates further chemical modifications, making it a versatile reagent in medicinal chemistry.