H-D-Lys(Z)-OMe · HCl

H-D-Lys(Z)-OMe · HCl is a protected, stereochemically defined lysine derivative in which the α-amino group is protected and the ε-amino side chain is masked as a benzyloxycarbonyl (Z, Cbz) carbamate, while the carboxyl group is present as a methyl ester (OMe). The D-lysine stereochemistry at the α-carbon provides a chiral amino acid framework suitable for building stereodefined peptide analogs and chiral intermediates. Salt formation with HCl increases handling stability of the amino functionality and can improve compatibility with peptide coupling workflows that require controlled amine availability. The combination of a removable Z protecting group and an ester handle supports orthogonal deprotection and downstream conversion to amide or carboxylic acid forms for peptide synthesis and synthetic intermediate preparation.

1. Protected Amino Acids

H-D-Lys(Z)-OMe · HCl supports protected amino acid synthesis strategies by combining a Z-protected lysine side-chain amine with a methyl ester at the carboxyl terminus. The Z carbamate enables chemoselective deprotection under hydrogenolysis-compatible conditions, while the ester can be converted to an acid or activated derivative for subsequent coupling steps. The D-configuration at the α-carbon allows stereochemical control when incorporating lysine into peptide building blocks or chiral libraries. Downstream transformations can generate orthogonally protected lysine scaffolds for stepwise peptide construction and for preparing defined intermediates used in fine chemical synthesis.

2. Peptide Synthesis

H-D-Lys(Z)-OMe · HCl is suitable for peptide synthesis workflows requiring a lysine residue with a protected ε-amino group and a carboxyl functionality masked as an ester. The Z-protected side chain participates in peptide coupling chemistry after orthogonal deprotection or activation of the ester-derived carboxyl equivalent, enabling controlled formation of amide bonds without premature ε-amino reactivity. The stereodefined D-lysine backbone can be incorporated to access D-lysine-containing peptides, which are commonly used to probe backbone recognition, protease resistance, and stereochemical effects in peptide science. The HCl salt form can facilitate reproducible handling and controlled activation of the carboxyl/amine functionalities during sequential assembly of peptide fragments.

3. Side-Chain Functionalization

H-D-Lys(Z)-OMe · HCl enables side-chain functionalization routes that begin with a protected ε-amino group and proceed through selective unmasking to reveal a nucleophilic amine. The Z carbamate provides a stable handle during ester activation and peptide coupling steps, then can be removed to allow derivatization such as acylation, alkylation, or attachment of linkers for conjugation chemistry. The lysine ε-amine geometry and D-stereochemistry support the preparation of stereodefined functional amino acid derivatives used as intermediates for labeled peptides, affinity reagents, and constrained peptidomimetics. Resulting derivatives can be carried forward into larger molecular assemblies where controlled ε-functionalization is required for molecular recognition or analytical detection.

4. Bioconjugation Chemistry

H-D-Lys(Z)-OMe · HCl can be applied in bioconjugation chemistry as a chiral amino acid precursor that provides a masked lysine side-chain for later conjugation steps. The Z-protected ε-amino group helps maintain low background reactivity during synthesis of conjugation-ready fragments, while deprotection can generate a primary amine suitable for coupling to activated esters, isothiocyanates, aldehydes, or other electrophiles. The D-lysine stereocenter can be leveraged to produce conjugates with defined stereochemical composition, which may be relevant for chemical biology experiments that track stereochemistry-dependent binding or stability. Downstream products from this intermediate can serve as building blocks for biomolecule labeling reagents and for constructing peptide-based probes used in biochemical research workflows.

5. Process Chemistry Intermediate

H-D-Lys(Z)-OMe · HCl is appropriate for process chemistry intermediate preparation where orthogonally protected amino acid functionality supports scalable synthesis planning. The methyl ester provides a controllable carboxyl equivalent for activation and conversion into peptide-grade acids or activated derivatives, while the Z protecting group offers a robust protection strategy that can be removed in a chemoselective manner when required. The crystalline salt form with HCl can improve handling reproducibility during batch manufacturing of protected amino acid building blocks and peptide coupling reagents. Industrial downstream use can include preparation of D-lysine-containing peptide fragments, peptidomimetic intermediates, and specialty chemical inputs for custom synthesis programs in pharmaceutical intermediate production and fine chemical manufacturing.

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