H-L-Lys(N3)-OH*HCI

L-Lys(N3)-OH hydrochloride is a stereochemically defined lysine derivative in which the α-amino acid backbone is present as the free amino acid (L-configuration) and the ε-amino side chain is protected as an azide-bearing N3 substituent. The hydrochloride salt form increases ionic character and handling stability, while the terminal carboxylic acid enables standard amino acid coupling chemistry and downstream derivatization. The side-chain azide provides a chemically orthogonal functional handle that can be retained during peptide assembly and later transformed into amines or reactive linkers through established azide-to-amine and azide-click strategies. The compound's protected side-chain functionality and salt-stabilized amino acid profile make it suitable as a chiral intermediate for peptide building block preparation and for controlled side-chain functionalization in synthetic and biochemical workflows.

1. Protected Amino Acid Synthesis

L-Lys(N3)-OH hydrochloride is applied in protected amino acid synthesis and building block preparation where lysine's α-carboxyl group and L-stereocenter must remain compatible with peptide coupling conditions. The ε-azide (N3) side-chain protection strategy supports selective functional-group manipulation without prematurely consuming the amine functionality needed for controlled incorporation. The hydrochloride salt form can be used to manage protonation state during synthesis planning and to facilitate handling as a defined amino acid intermediate. Incorporation of this chiral lysine derivative into larger sequences enables downstream deprotection or azide conversion steps to generate functional side chains for peptide analog construction and synthetic methodology development.

2. Peptide Synthesis

L-Lys(N3)-OH hydrochloride serves as a lysine-containing peptide building block for solid-phase or solution-phase peptide synthesis where orthogonal side-chain chemistry is required. The α-amino acid functionality supports formation of amide bonds at the peptide backbone, while the ε-azide side chain can be carried through coupling cycles as a protected handle. The azide group can be preserved through peptide assembly and later used for selective conjugation or for converting the side chain into an amine-bearing lysine derivative, enabling site-specific functionalization of peptide scaffolds. The resulting peptide products can function as controlled-linker or reactive intermediate precursors for further derivatization in chemical biology and materials-oriented peptide engineering.

3. Bioconjugation Chemistry

L-Lys(N3)-OH hydrochloride is used in bioconjugation workflows that require a defined, orthogonal azide functional group for selective attachment to biomolecules. The lysine-based scaffold provides a carboxyl/amine-compatible amino acid framework that can be incorporated into peptides, linkers, or activated intermediates while retaining the ε-azide as a reactive tag. The azide functionality can participate in click-type coupling chemistries or azide-to-amine transformations to generate amine-bearing conjugates with controlled attachment points. Downstream conjugate formation supports analytical labeling, probe construction, and biomolecule modification strategies where stereodefined amino acid chemistry improves reproducibility of functional group placement.

4. Chemical Biology Probes

L-Lys(N3)-OH hydrochloride is applied in chemical biology research to generate lysine-functional probes and reactive peptide fragments for studying protein interactions and site-specific biochemical labeling. The L-lysine backbone enables incorporation into peptide mimics and recognition elements, while the ε-azide provides a handle for introducing reactive moieties under mild, chemoselective conditions. The hydrochloride salt form can support consistent reactivity planning when preparing probe intermediates that require defined protonation states during coupling or activation steps. The resulting azide-bearing lysine derivatives can be used to construct molecular tools for mapping functional sites, generating labeled analogs, and enabling controlled probe-to-target attachment in biochemical investigations.

5. Process Chemistry Intermediate

L-Lys(N3)-OH hydrochloride is suitable as a chiral amino acid intermediate in process chemistry and fine chemical synthesis where lysine side-chain protection must be stable through multi-step manufacturing. The presence of the α-carboxylic acid and the ε-azide enables a controlled sequence of transformations: peptide coupling compatibility for building larger structures and later conversion of the azide to desired functional groups for downstream product families. The salt form supports practical handling and can be leveraged in manufacturing route design to manage solubility and reproducible feeding behavior across synthetic steps. Use of this intermediate supports scalable preparation of azide-functional amino acid derivatives, peptide building blocks, and conjugation-ready intermediates for industrial chemical production pipelines.

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