(R)-tert-Butyl 2-(2-hydroxyethyl)piperazine-1-carboxylate hydrochloride is a chiral piperazine derivative featuring a tert-butoxycarbonyl (Boc) protecting group on one nitrogen and a 2-hydroxyethyl substituent on the adjacent carbon. The hydrochloride salt form enhances its stability and handling properties. This compound is a key building block in pharmaceutical synthesis, valued for its defined stereochemistry at the 2-position. Its primary application is as a versatile chiral intermediate in the research and development of active pharmaceutical ingredients (APIs), particularly in the synthesis of complex drug candidates. The presence of both a protected amine (Boc) and a hydroxyl group allows for selective functionalization, making it a crucial precursor for constructing molecules with piperazine cores, which are prevalent in various therapeutic agents targeting the central nervous system, infectious diseases, and other areas. The (R)-enantiomer is specifically sought after for creating stereochemically pure compounds. This intermediate is commercially available from fine chemical suppliers specializing in advanced pharmaceutical intermediates and chiral building blocks. It is typically handled under standard laboratory safety protocols, and its use is governed by the specific synthetic routes of proprietary drug development programs.