(R)-Tetrahydrofuran-3-amine hydrochloride is a chiral amine derivative featuring a tetrahydrofuran ring. It is a white to off-white crystalline powder commonly used as a high-value building block in pharmaceutical synthesis. This compound serves as a key chiral intermediate in the production of various active pharmaceutical ingredients (APIs). Its primary application is in the synthesis of antiviral drugs, particularly those targeting hepatitis C virus (HCV). It is a crucial structural component in the synthesis of sofosbuvir, a leading direct-acting antiviral medication. The chiral center and the heterocyclic amine functionality make it a versatile synthon for constructing complex molecules with specific stereochemistry. As a specialty chemical, it is primarily supplied for research and development purposes and for use in the commercial manufacturing of finished dosage forms. Handling requires standard laboratory precautions for amine hydrochlorides.