(S)-3-Aminobutanenitrile hydrochloride is primarily used in the synthesis of chiral compounds, particularly in the pharmaceutical industry. It serves as a key intermediate in the production of various active pharmaceutical ingredients (APIs) that require specific stereochemistry for enhanced efficacy and reduced side effects. This compound is often employed in the development of drugs targeting neurological disorders, cardiovascular diseases, and other therapeutic areas where enantiomeric purity is critical. Additionally, it is utilized in organic synthesis to create complex molecules for research and development purposes, aiding in the discovery of new drugs and bioactive compounds. Its role in asymmetric synthesis makes it valuable for constructing chiral centers in molecules, which is essential for producing optically pure substances.