Fmoc-D-Dap-OH*HCl

Fmoc-D-Dap-OH*HCl is an Fmoc-protected D-configuration amino acid derivative of 2,3-diaminopropanoic acid (D-Dap) supplied as the hydrochloride salt, combining an N-(9H-fluoren-9-ylmethoxycarbonyl) protecting group with a side chain bearing two primary amino functionalities and a free carboxylic acid. The D-stereocenter at the amino acid backbone provides defined stereochemistry for incorporation into peptides and peptidomimetics, while the salt form moderates amine basicity and improves handling for coupling chemistry. The presence of the Fmoc carbamate enables orthogonal deprotection under standard base conditions, and the unmasked carboxylic acid participates in amide bond formation after activation. The diamine side chain can be selectively protected, acylated, or functionalized to tune solubility, charge density, and subsequent derivatization outcomes in biochemical and synthetic workflows.

1. Protected Amino Acid Synthesis

Fmoc-D-Dap-OH*HCl supports protected amino acid synthesis workflows where a D-configured diamino acid building block is required for peptide building block preparation. The Fmoc carbamate protects the alpha-amino group during coupling and can be removed to expose the amine for iterative chain elongation, while the carboxylic acid provides the C-terminal functionality for activation-based peptide coupling. The hydrochloride salt form helps stabilize the diamine side chain in storage and can be managed during protection-group installation to control chemoselectivity. The resulting intermediate utility aligns with protected amino acid chemistry and downstream peptide assembly strategies that require stereochemically defined diamino acid residues.

2. Peptide Synthesis

Fmoc-D-Dap-OH*HCl is well suited for solid-phase peptide synthesis and related peptide coupling chemistry targeting D-amino acid incorporation. The Fmoc group enables stepwise N-terminal deprotection and re-coupling, while the D-configured backbone stereochemistry can be used to generate peptides with defined conformational and protease-resistance profiles. The side-chain diamine functionality can be protected orthogonally to the Fmoc group, allowing controlled formation of peptide analogs that preserve or later reveal cationic charge for binding studies. The hydrochloride salt form can facilitate handling of the diamine residue during synthesis, supporting consistent incorporation into peptide sequences and enabling subsequent side-chain derivatization after assembly.

3. Bioconjugation Chemistry

Fmoc-D-Dap-OH*HCl can be applied in bioconjugation chemistry where cationic, amine-rich handles are needed for attachment to biomolecules. The diamine side chain provides two primary amines that can undergo selective acylation, sulfonylation, or linker installation after appropriate protection-group management, while the Fmoc group supports controlled exposure of the alpha-amino position in peptide or scaffold contexts. The D-stereochemistry can be leveraged in chemical biology constructs to modulate stability and recognition when diamino acid-containing linkers are embedded into peptide conjugates. The compound therefore functions as a chiral amino acid intermediate for generating amine-functionalized conjugation reagents and peptide-based labeling materials used in biomolecule modification workflows.

4. Peptidomimetics And SAR Studies

Fmoc-D-Dap-OH*HCl is suitable for peptidomimetic construction and structure-activity relationship studies that require charged diamino acid motifs. The side-chain diamine can be tuned through protection and subsequent functional group transformations to vary basicity, hydrogen-bonding capacity, and intramolecular salt-bridge formation, while the carboxylic acid and Fmoc-protected amine support incorporation into defined scaffold architectures. D-configuration at the backbone can be used to systematically compare stereochemical effects on conformation and binding-site interactions in SAR-oriented molecular design. The resulting analogs can be generated as peptide-like intermediates for iterative synthesis and analytical evaluation, linking amino acid derivatization to scaffold-level structure optimization.

5. Process Chemistry Intermediate

Fmoc-D-Dap-OH*HCl can serve as a chiral process chemistry intermediate for manufacturing routes that require protected D-amino acid derivatives with controlled functional-group exposure. The Fmoc carbamate provides a stable protecting group during handling and coupling operations, while the hydrochloride salt form can improve reproducibility of amine protonation state during downstream processing steps. The diamine side chain enables predictable derivatization to protected or activated forms, supporting scalable preparation of peptide building block variants used in fine chemical synthesis. The compound's defined stereochemistry and protected functionality make it compatible with industrially relevant amino acid derivative supply chains where consistent intermediate quality and predictable deprotection/coupling behavior are required.

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