H-D-Lys(Boc)-OtBu · HCl

H-D-Lys(Boc)-OtBu · HCl is a protected D-lysine derivative presented as a hydrochloride salt, combining a Boc-protected side-chain-free α-amino group with a tert-butyl ester at the C-terminus. The molecule contains a stereogenic center at the lysine α-carbon, and the D-configuration can be used to control stereochemical outcomes in peptide and peptidomimetic sequences. The Boc carbamate and the tert-butyl ester provide acid-labile and acid-stable protection patterns, respectively, enabling orthogonal deprotection logic during protected amino acid synthesis and stepwise peptide assembly. The lysine side chain is retained in a protected form suitable for coupling chemistry, while the hydrochloride counterion supports handling and can influence solubility and downstream activation behavior in synthetic workflows.

1. Protected Amino Acids

H-D-Lys(Boc)-OtBu · HCl supports protected amino acid synthesis workflows where orthogonal protection is required for sequential functional group transformations. The Boc-protected amino functionality and the tert-butyl ester at the carboxyl terminus enable controlled peptide coupling at the protected carboxyl while preserving the amino group for later activation and assembly. The D-lysine stereochemistry can be leveraged to introduce stereodefined lysine residues into peptide building block preparation, including unnatural amino acid incorporation strategies. The hydrochloride salt form facilitates reagent handling and can be applied to downstream deprotection planning for generating reactive amino acid derivatives from protected intermediates.

2. Peptide Synthesis

H-D-Lys(Boc)-OtBu · HCl functions as a peptide coupling-compatible building block for constructing lysine-containing peptides and peptide fragments under standard amide bond-forming conditions. The Boc group protects the α-amino terminus during activation of the ester-derived carboxyl functionality, while the tert-butyl ester can be used as a protected C-terminus handle that survives multiple synthetic steps before conversion to a free acid. The D-configuration at the lysine α-carbon enables stereochemically defined peptide analogs that can be incorporated into sequence-defined scaffolds for biochemical research and SAR studies. The salt form can be used to tune handling characteristics during peptide synthesis and to support consistent intermediate preparation across multi-step manufacturing-like sequences.

3. Bioconjugation Chemistry

H-D-Lys(Boc)-OtBu · HCl can be applied to chemical biology and bioconjugation strategies that require lysine-based functional handles for conjugate construction. The lysine framework, together with protected amine and carboxyl functionalities, enables controlled generation of reactive sites after selective deprotection, supporting attachment of linkers, tags, or affinity motifs to peptide or biomolecule scaffolds. The stereodefined D-lysine residue can be used to modulate conformational preferences and labeling behavior in peptide conjugates, which may influence recognition in analytical assays. The protected intermediate nature of H-D-Lys(Boc)-OtBu · HCl supports stepwise synthesis of conjugation-ready amino acid derivatives for subsequent coupling to proteins, polymers, or small-molecule carriers.

4. Peptidomimetics And SAR

H-D-Lys(Boc)-OtBu · HCl serves in peptidomimetic construction where lysine side-chain chemistry and stereochemical control are central to structure-activity relationship studies. The protected amino acid format allows incorporation of a D-lysine unit into constrained analogs, enabling systematic variation of stereochemistry while maintaining a consistent synthetic entry point for analog libraries. The Boc and tert-butyl ester protection pattern supports modular synthesis of analogs that can be deprotected to reveal functional groups for further derivatization, including side-chain functionalization and terminal modifications. The resulting D-lysine-containing intermediates can be used to generate structure-defined scaffolds for SAR mapping and molecular design efforts in applied research settings.

5. Process Chemistry Intermediate

H-D-Lys(Boc)-OtBu · HCl is suitable for process chemistry intermediate preparation where protection-group stability and deprotection sequencing affect manufacturing practicality. The Boc-protected amine and tert-butyl ester provide a predictable protection/deprotection logic that can be integrated into scalable routes for protected amino acid derivatives and peptide building blocks. The hydrochloride salt form can improve handling and reproducibility during intermediate isolation and can be leveraged to manage solubility and reaction initiation behavior in larger-scale synthesis. The stereochemical integrity of the D-lysine center can be maintained through protected-step manufacturing strategies, supporting consistent quality for downstream fine chemical synthesis and peptide-related production workflows.

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