Fmoc-D-Lys(N3)-OH

Fmoc-D-Lys(N3)-OH is a D-lysine derivative bearing an N-(azido) side-chain functionality and an Fmoc-protecting group on the α-amino position, forming a stable, chiral amino acid building block for peptide assembly and downstream functionalization. The molecule contains a stereogenic center at the α-carbon, a carboxylic acid for C-terminal coupling, and a primary ε-amino group masked as an azide (N3) to enable orthogonal reactivity without interfering with standard peptide coupling chemistry. The Fmoc group provides base-labile protection compatible with solid-phase peptide synthesis, while the azide side chain serves as a bioorthogonal handle that can participate in selective transformations after peptide construction. The presence of both an activated coupling site (carboxylic acid) and a protected amine/latent electrophile (azide) makes the compound suitable for controlled side-chain derivatization and for preparing chiral intermediates that retain peptide-compatible functionality.

1. Peptide Synthesis

Fmoc-D-Lys(N3)-OH is applied in peptide synthesis workflows where Fmoc-based N-protection and a carboxylic acid enable reliable amide bond formation during stepwise chain extension. The ε-azide side chain is positioned to remain intact under typical Fmoc deprotection conditions, allowing the azido functionality to be carried through peptide assembly without premature side reactions. The D-lysine stereochemistry supports incorporation of a defined chiral residue into peptides used for mapping stereochemical effects, epitope presentation, or conformational studies. The resulting azide-bearing peptide products can subsequently undergo orthogonal ligation or derivatization, linking protected amino acid chemistry to functional peptide generation.

2. Bioconjugation Chemistry

Fmoc-D-Lys(N3)-OH is used in chemical biology and bioconjugation strategies that require a controlled azide handle for post-synthetic functionalization. The ε-azide group provides a site for selective click-type coupling reactions with complementary alkynes or other azide-reactive partners, while the peptide-compatible backbone allows the azide to be installed at a defined position within longer constructs. The Fmoc-protected α-amino group supports incorporation into peptides or peptide-like scaffolds that can be used as targeting motifs, linkers, or molecular probes. Downstream conjugation to biomolecules, polymers, or surfaces can be designed by choosing azide-reactive partners, enabling structured assembly of functional conjugates from a single chiral amino acid intermediate.

3. Peptidomimetics And SAR

Fmoc-D-Lys(N3)-OH supports peptidomimetic construction and structure-activity relationship studies by enabling lysine analogs with a chemically addressable side chain. The lysine backbone provides a defined spatial arrangement of the ε-substituent, while the azide allows conversion into diverse functional groups after synthesis, supporting SAR workflows that compare side-chain electronics, sterics, and hydrogen-bonding patterns. The D-configuration can be incorporated to probe stereochemical influence on protease resistance, binding-site geometry, and conformational preferences in peptide analogs. The Fmoc strategy allows systematic preparation of analog series as protected amino acid building blocks, facilitating consistent downstream transformations into multiple derivative classes.

4. Process Chemistry Intermediate

Fmoc-D-Lys(N3)-OH is suitable for process chemistry and fine chemical synthesis routes where orthogonally protected functionality is required for controlled manufacturing of peptide intermediates. The base-labile Fmoc group supports predictable deprotection logic in automated or semi-automated peptide production, while the side-chain azide provides a stable latent functionality that can be carried through intermediate stages before final conversion. The compound's defined chiral center and carboxylic acid handle make it compatible with standard peptide coupling chemistries used to generate larger fragments and protected amino acid sequences. Industrial downstream utility can include preparation of azide-functional peptide fragments, linker building blocks, and chiral intermediates that feed into specialty chemical production and manufacturing of functional biomolecular reagents.

5. Analytical Research Standards

Fmoc-D-Lys(N3)-OH is employed in analytical research settings requiring azide-bearing amino acid or peptide standards for method development and characterization. The combination of Fmoc protection and an ε-azide side chain enables generation of reference materials that can be tracked by chromatographic and mass spectrometric workflows, including confirmation of side-chain integrity after deprotection and coupling steps. The D-lysine stereochemistry supports stereospecific analytical comparisons when distinguishing enantiomeric behavior in derivatization or fragmentation patterns. The compound can also serve as a starting point for preparing labeled or derivatized analogs used to validate analytical selectivity, identity, and conversion completeness in peptide and amino acid transformation studies.

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