Boc-L-asparaginol is a Boc-protected derivative of L-asparaginol, an amino alcohol obtained from the reduction of L-asparagine. It serves as a key building block in solid-phase peptide synthesis (SPPS) for incorporating asparagine-like residues into peptides. The Boc protecting group shields the α-amino function, enabling selective N-terminal coupling and preventing unwanted side reactions from the asparagine side-chain amide. This reagent is essential for synthesizing complex peptides and proteins, providing stability under acidic and basic conditions. Its applications include pharmaceutical development and the creation of bioactive peptides where precise control over residue reactivity is required.