(S)-4-Methyloxazolidin-2-one is primarily used as a chiral auxiliary in asymmetric synthesis. It helps in the stereoselective formation of carbon-carbon and carbon-heteroatom bonds, making it valuable in the production of enantiomerically pure compounds. This chemical is often employed in the synthesis of pharmaceuticals, where controlling the stereochemistry of drug molecules is crucial for their efficacy and safety. Additionally, it finds application in the preparation of complex natural products and fine chemicals, enhancing the precision and efficiency of synthetic routes. Its role in facilitating high-yield, stereocontrolled reactions makes it a key tool in organic chemistry and drug development.