(2S,4R)-1-BOC-2-hydroxymethyl-4-amino Pyrrolidine is a chiral, protected pyrrolidine derivative. It features a hydroxymethyl group at the 2-position and a Boc-protected amino group at the 4-position, with defined (2S,4R) stereochemistry. This compound is a high-purity building block, typically supplied as a white to off-white solid. This molecule is primarily employed as a key chiral intermediate in pharmaceutical research and development. Its rigid pyrrolidine scaffold, combined with multiple functional handles (amine and alcohol), makes it a valuable precursor for constructing complex bioactive molecules. It is notably used in the synthesis of peptide mimetics and peptidomimetic drugs, where it can serve as a proline-like constrained amino acid surrogate to modulate the conformational and pharmacological properties of target compounds. The Boc protecting group allows for selective deprotection and further functionalization, facilitating its integration into complex synthetic sequences. Its application is centered on medicinal chemistry and the production of potential active pharmaceutical ingredients (APIs), particularly in areas targeting proteases or other biologically relevant proteins.