(3R,4S)-(3-hydroxy-piperidin-4-yl)-carbamic acid tert-butyl ester is a chiral piperidine derivative featuring both a protected amino group (as a Boc carbamate) and a free hydroxyl group. Its specific (3R,4S) stereochemistry makes it a valuable non-natural amino acid-like building block, particularly useful in the synthesis of complex molecules where precise spatial orientation is critical. This compound is primarily employed as a key chiral intermediate in pharmaceutical research and development. Its structure serves as a core scaffold or a functionalized fragment for constructing active pharmaceutical ingredients (APIs), especially those targeting the central nervous system or acting as enzyme inhibitors. The Boc-protected amine allows for selective deprotection and further functionalization under mild conditions, while the hydroxyl group provides an additional handle for derivatization or for influencing the molecule's physicochemical properties and binding interactions. As a specialty chiral synthon, it is not considered a commodity chemical or a general-purpose reagent. Its synthesis and application are typically found in advanced medicinal chemistry programs aimed at creating novel therapeutic agents with defined stereochemistry.