Bz-Lys-OH

Bz-Lys-OH is an N-protected lysine derivative in which the ε-amino group is protected as a benzylamide (Bz) while the α-amino and α-carboxyl functions are present as a free amino acid (α-amino acid, C-terminal carboxylic acid). The structure contains a chiral lysine backbone with a stereogenic α-carbon, plus a protected side-chain amide that modulates nucleophilicity and directs chemoselective transformations. The benzylamide functionality provides stability under conditions used for peptide coupling at the α-carboxyl while enabling controlled deprotection or side-chain activation in downstream steps. The carboxylic acid supports standard amino acid esterification and activation chemistries, making Bz-Lys-OH a practical chiral intermediate for protected amino acid synthesis and peptide building block preparation.

1. Peptide Synthesis

Bz-Lys-OH is used in peptide synthesis workflows where a lysine residue with an ε-amide-protected side chain is required for chemoselective coupling. The protected ε-amino group as a benzylamide reduces side-chain participation during standard amide bond formation at the α-carboxyl, while the free α-amino and carboxylic acid enable incorporation as a building block. The carboxylic acid can be activated for peptide coupling, and the α-amino functionality can be protected or manipulated to match the coupling strategy used for N-terminal or internal residues. Downstream, the benzylamide-protected lysine side chain can be transformed to regenerate lysine functionality or to introduce lysine-derived motifs in longer peptides and peptide fragments, supporting synthesis of sequence-defined constructs and protected peptide intermediates.

2. Side-Chain Functionalization

Bz-Lys-OH supports amino acid derivatization strategies that target lysine side-chain chemistry while maintaining compatibility with peptide-like functional group patterns. The ε-amide (benzylamide) provides a handle for controlled side-chain modifications, including selective activation pathways that can later convert the protected lysine into reactive derivatives for conjugation or further functional group installation. The presence of a free carboxylic acid facilitates formation of activated esters or coupling-ready derivatives that can be carried through multistep sequences without exposing an unprotected ε-amine. The resulting lysine-based intermediates can be used to generate side-chain functionalized amino acid derivatives for constructing labeled peptides, affinity reagents, or peptidomimetic scaffolds where lysine reactivity must be temporally controlled.

3. Chiral Building Block Development

Bz-Lys-OH functions as a chiral amino acid intermediate for stereochemically defined synthesis of lysine-containing molecules. The lysine α-stereocenter is retained in the protected amino acid framework, enabling predictable stereochemical outcomes during peptide coupling, esterification, or conversion to activated carboxy derivatives. The benzylamide protection pattern on the ε-nitrogen provides a defined protection strategy that can be carried through chiral synthesis routes, limiting undesired side reactions associated with free amino groups. The compound can be employed to prepare downstream chiral intermediates for fine chemical synthesis and peptide analog construction, where stereochemical integrity and orthogonal functional group management are required for reproducible molecular assembly.

4. Chemical Biology Probes

Bz-Lys-OH is applicable to chemical biology research requiring lysine-containing labeling motifs with controlled amine reactivity. The protected ε-amide reduces nonspecific binding and can be used to stage lysine functionality for later introduction of reactive groups used in probe conjugation workflows. The free carboxylic acid and α-amino acid framework enable incorporation into peptide-like carriers or linkers that maintain defined spacing and orientation of functional groups. Downstream derivatization can produce lysine-bearing conjugates suitable for biomolecule modification strategies, including preparation of peptide-based tags and affinity handles that rely on controlled lysine chemistry for selective attachment.

5. Pharmaceutical Intermediate Preparation

Bz-Lys-OH is suitable for pharmaceutical intermediate preparation where protected amino acid chemistry supports manufacturing-oriented synthetic design. The benzylamide-protected ε-amino group provides an orthogonal protection element that can withstand common activation steps for carboxylic acids, enabling reliable conversion into coupling-ready intermediates used in peptide or peptidomimetic manufacturing routes. The amino acid's defined functional group set supports iterative assembly of protected fragments and subsequent transformation of the lysine side chain under controlled conditions to reach target intermediate profiles. The compound can therefore be used as a chiral, protection-managed lysine building block in fine chemical synthesis programs that require consistent amino acid handling and predictable downstream conversion to larger, sequence-defined intermediates.

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