(R)-2-Methylmorpholine hydrochloride is a chiral organic compound featuring a morpholine ring substituted with a methyl group at the 2-position, and it is supplied as its hydrochloride salt. This salt form enhances its stability and solubility, making it a practical solid for handling and storage in laboratory and industrial settings. This compound serves as a crucial chiral building block and intermediate in pharmaceutical synthesis. Its primary application lies in the preparation of active pharmaceutical ingredients (APIs), particularly those targeting the central nervous system. For instance, it is a key intermediate in the synthesis of aprepitant, a neurokinin-1 (NK1) receptor antagonist used as an antiemetic to prevent chemotherapy-induced nausea and vomiting. The (R)-enantiomer provides the desired stereochemistry necessary for biological activity in such drug molecules. As a secondary amine with a constrained morpholine structure, it is also employed as a chiral base or ligand in asymmetric synthesis. Its utility extends to the development of other therapeutic agents and fine chemicals where the introduction of a chiral morpholine scaffold is required.