H-Lys(Me)3-OH chloride

H-Lys(Me)3-OH chloride is a lysine-derived amino acid chloride in which the ε-amino side chain is substituted with three methyl groups, generating a sterically hindered, tertiary amine functionality while retaining the α-amino acid framework (α-carboxylic acid and α-amino group) in a salt form. The chloride counterion stabilizes the cationic nitrogen during handling and can influence coupling behavior by controlling amine basicity and solubility. The chiral lysine backbone preserves stereochemical integrity at the α-carbon, making the compound suitable for stereodefined peptide building-block synthesis. The tertiary, methylated side chain can participate in selective derivatization and downstream transformations that differ from native ε-primary lysine, enabling targeted amino acid modification and peptidomimetic design.

1. Protected Amino Acids

H-Lys(Me)3-OH chloride is used as an amino acid chloride salt precursor in protected amino acid synthesis where controlled amine protonation supports isolation and stepwise functional-group management. The α-carboxylic acid and α-amino group enable standard peptide coupling logic after conversion to an appropriate protected form, while the Me3-substituted ε-nitrogen provides a distinct reactivity profile compared with unmodified lysine. The steric bulk around the tertiary side-chain nitrogen can be leveraged to tune chemoselectivity during protection-group installation or during selective deprotection sequences. The resulting protected lysine analogs can serve as defined intermediates for N-/C-terminally modified peptide building blocks and for controlled side-chain functionalization workflows in synthetic organic chemistry.

2. Peptide Synthesis

H-Lys(Me)3-OH chloride is applied in peptide coupling and peptide building block preparation where a lysine-derived residue with a tertiary ε-amine can be incorporated into linear peptides and peptide fragments. The retained α-amino acid stereochemistry supports stereodefined amide bond formation, while the carboxylic acid functionality participates in standard coupling strategies after activation. The tertiary Me3 side chain can reduce undesired side reactions associated with primary ε-amines, and it can also modulate solubility and intramolecular interactions within growing chains. Peptide analogs containing this lysine variant can be used for structure-activity relationship studies and for generating defined peptidomimetic scaffolds where lysine-like spacing is preserved but side-chain nucleophilicity is altered.

3. Bioconjugation Chemistry

H-Lys(Me)3-OH chloride is suitable for bioconjugation and biomolecule labeling strategies that rely on controlled amine chemistry, including conjugation handles derived from tertiary amine-containing amino acid residues. The compound's amino acid framework can be incorporated into peptide tags or linker segments, providing a defined attachment point for subsequent derivatization steps that transform the side-chain nitrogen into reactive electrophiles or affinity motifs. The chloride salt form can aid reproducible handling during intermediate preparation, while the tertiary Me3 substitution helps steer conjugation selectivity away from primary-amine pathways. Downstream conjugates can be employed in chemical biology research to generate well-defined labeling reagents, affinity probes, or modular linkers for biomolecule modification and analytical assays.

4. Peptidomimetics And SAR

H-Lys(Me)3-OH chloride is used in peptidomimetic construction and medicinal chemistry-oriented SAR studies where lysine side-chain geometry is retained but nucleophilicity and protonation behavior are tuned by Me3 substitution. The tertiary ε-amine can influence local charge distribution, hydrogen-bonding capacity, and conformational preferences relative to canonical lysine residues. The chiral α-amino acid backbone supports incorporation into peptide-like frameworks, enabling systematic evaluation of side-chain sterics and basicity effects on molecular recognition. The compound thus functions as a chemically defined intermediate for generating libraries of lysine analogs, fragment-derived scaffolds, and structure-guided analogs used in applied molecular design.

5. Process Chemistry Intermediate

H-Lys(Me)3-OH chloride is relevant to process chemistry and fine chemical synthesis as a chiral amino acid intermediate whose salt form can improve handling characteristics during scale-up of downstream protected amino acid derivatives. The presence of both α-amino and α-carboxyl groups supports conversion into activated intermediates for peptide coupling or into protected derivatives for controlled manufacturing sequences. The tertiary, methylated side chain can reduce competing side reactions associated with primary amines, which may simplify purification logic when preparing peptide building blocks or linker units. The compound can therefore serve as a feedstock for industrial intermediate preparation, including the manufacturing of lysine-variant residues used in peptide materials, specialty chemical production, and amino acid-based synthetic platforms.

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