(R)-tert-Butyl 2-propylpiperazine-1-carboxylate hydrochloride is primarily used in pharmaceutical research and development, particularly in the synthesis of chiral compounds. Its application is significant in the creation of active pharmaceutical ingredients (APIs) for drugs targeting neurological and psychiatric disorders. The compound serves as a key intermediate in the production of selective receptor agonists or antagonists, which are crucial for modulating specific pathways in the central nervous system. Additionally, it is utilized in the development of enantiomerically pure compounds, ensuring high specificity and efficacy in therapeutic applications. Its role in medicinal chemistry underscores its importance in advancing treatments for complex diseases.