N-Fmoc-L-threoninol is employed in solid-phase peptide synthesis as a protected amino alcohol building block, facilitating selective incorporation at the C-terminus or as a spacer in peptide chains. The Fmoc protecting group permits mild base-mediated deprotection, ensuring compatibility with diverse orthogonal side-chain protecting strategies. Renowned for its stability and preservation of stereochemical integrity, it is widely used in the assembly of complex peptides, glycopeptides, and peptide conjugates. Essential in the production of peptide-based pharmaceuticals, biochemical probes, and advanced research tools demanding precise structural modulation.