Used primarily in organic synthesis as a chiral auxiliary for the asymmetric synthesis of amines. Its ability to form stable imine derivatives with aldehydes and ketones allows for highly stereoselective nucleophilic additions, enabling the efficient production of enantiomerically pure amines, which are key building blocks in pharmaceuticals and agrochemicals. After serving its directing role, the tert-butylsulfinyl group can be readily removed under mild acidic conditions, making it a practical and versatile tool in multi-step synthesis. Widely employed in the preparation of bioactive molecules, including drugs and natural products.