Fmoc-L-Lys(Me3)-OH*Cl

Fmoc-L-Lys(Me3)-OH*Cl is an Fmoc-protected, stereodefined lysine derivative bearing a tertiary side-chain amine substituted with a trimethyl group and supplied as a chloride salt, providing a chiral amino acid building block suited to controlled peptide chemistry. The molecule contains an Fmoc carbamate on the alpha-amine, a free carboxylic acid functionality for amide bond formation, and a permanently cationic, quaternized-like lysine side chain that is stabilized as a salt form, which can influence coupling behavior and downstream deprotection outcomes. The presence of an alpha-chiral center and the protected N-terminus supports stereochemically consistent incorporation into peptide sequences, while the tertiary trimethylammonium motif enables ionic interactions and pH-dependent solubility changes relevant to biochemical and materials research. The chloride counterion and the salt form also position the compound as a practical intermediate for protected amino acid synthesis, peptide building block preparation, and subsequent functional transformations of lysine-derived side-chain chemistry.

1. Peptide Synthesis

Fmoc-L-Lys(Me3)-OH*Cl is used in peptide synthesis workflows where an Fmoc-protected lysine analog provides a defined N-protection strategy for stepwise solid-phase or solution-phase coupling. The Fmoc carbamate on the alpha-amine supports orthogonal deprotection logic, while the free carboxylic acid participates in standard peptide coupling chemistry to form stable amide linkages. The trimethylated lysine side chain, present as a chloride salt, can modulate local charge density in the growing peptide, which may affect aggregation and purification of cationic sequences. Incorporation of this chiral amino acid building block can yield peptide products with persistent positive charge for studying sequence-dependent behavior and for constructing peptide scaffolds with lysine-like ionic features.

2. Chemical Biology

Fmoc-L-Lys(Me3)-OH*Cl serves chemical biology and biomolecular interaction studies by enabling incorporation of a permanently charged lysine side chain mimic into peptides and peptide conjugates. The quaternary-like trimethylammonium functionality promotes electrostatic interactions with nucleic acids, acidic protein surfaces, or anionic biomolecular domains, while the Fmoc-protected backbone allows controlled assembly of labeled or functionalized peptide probes. Chloride salt formation can improve handling and reproducibility of the amino acid intermediate during derivatization and coupling steps, supporting consistent charge-state behavior in downstream assays. The resulting cationic peptide analogs can be applied as research reagents for molecular recognition studies, binding-site mapping, and structure-function evaluation of positively charged peptide motifs.

3. Bioconjugation Chemistry

Fmoc-L-Lys(Me3)-OH*Cl is applicable to bioconjugation strategies where a lysine-derived, trimethylammonium side chain provides a robust handle for ionic conjugate design without relying on labile side-chain nucleophilicity. The protected alpha-amine enables peptide fragment construction that can later be coupled to targeting ligands, linkers, or biomolecule-reactive motifs, while the side-chain trimethyl group maintains a stable cationic character that can enhance aqueous solubility and electrostatic tethering. Chloride counterion association supports predictable salt handling during intermediate preparation and purification of conjugation-ready peptide fragments. Downstream products may include cationic peptide linkers, cell-surface binding probes, or modular conjugation components used in biochemical research and applied molecular labeling.

4. Peptidomimetics And SAR

Fmoc-L-Lys(Me3)-OH*Cl supports peptidomimetic construction and structure-activity relationship studies by providing a stereodefined lysine scaffold with a fixed, positively charged side chain. The Fmoc-protected alpha-amine enables systematic substitution patterns in peptide analog libraries, while the carboxyl group allows incorporation into amide-linked backbones that maintain conformational and charge features relevant to SAR workflows. The trimethylated side chain can be used to probe the contribution of lysine charge and steric profile to binding, uptake, or receptor recognition in non-clinical research contexts. The compound thus functions as a chiral amino acid intermediate for generating charged peptidomimetic series and for supporting comparative scaffold synthesis in medicinal chemistry and chemical biology programs.

5. Process Chemistry Intermediate

Fmoc-L-Lys(Me3)-OH*Cl is suitable for process chemistry and fine chemical synthesis as a manufacturable, protected amino acid derivative designed for reliable peptide building block preparation. The Fmoc protection on the alpha-amine provides a stable handle for upstream storage and controlled coupling, while the chloride salt form of the trimethylated side chain supports consistent physicochemical behavior during batch operations and intermediate isolation. The defined stereochemistry and functional group set (carboxylic acid plus protected amine) facilitate predictable downstream transformations into peptide intermediates and standardized cationic fragments used in further synthesis. Industrially relevant use can include preparation of charged peptide reagents, peptide-based intermediates for specialty chemical production, and scalable inputs for manufacturing routes that require protected amino acid chemistry compatibility.

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