Fmoc-D-His-OH is an Fmoc-protected, D-configured histidine derivative in which the imidazole-bearing side chain corresponds to the amino acid histidine while the alpha-amino and carboxyl functionalities are configured for peptide-coupling chemistry. The molecule contains a fluorenylmethoxycarbonyl (Fmoc) group on the amino nitrogen, leaving the carboxylic acid as a free COOH for activation and coupling, and it bears the histidine imidazole ring as the side-chain functional group. In peptide synthesis workflows, the protected amino acid is employed as a building block for stepwise incorporation of a D-histidine residue into peptides and for preparing labeled or conformationally defined analogues where stereochemical control at the amino acid position is required.
Fmoc-D-His-OH is a fluorenylmethoxycarbonyl (Fmoc) protected D-configured histidine building block featuring a stereogenic center at the alpha carbon and a side-chain imidazole ring. The molecule contains an Fmoc carbamate that masks the amino functionality for controlled peptide coupling, while the carboxylic acid remains available for C-terminal activation and amide bond formation. The D-stereochemistry provides a defined chiral inversion relative to L-histidine, enabling incorporation of D-amino acid motifs into peptides, peptidomimetics, and conformationally constrained analogs. The imidazole group can participate in acid-base chemistry and metal coordination, and it is compatible with orthogonal protection or selective derivatization strategies during peptide synthesis and downstream functionalization.
1. Peptide Synthesis
Fmoc-D-His-OH is used in peptide building workflows where Fmoc-based N-protection supports standard peptide coupling and iterative chain assembly. The protected amino group enables reliable amide bond formation after carboxyl activation, while the free carboxylic acid supports C-terminal incorporation in protected amino acid chemistry. The D-histidine stereocenter and the imidazole side chain allow construction of peptides with altered backbone stereochemistry and histidine-like functional recognition sites. Side-chain reactivity can be managed through imidazole protection or selective deprotection/derivatization steps, supporting formation of D-his-containing sequences for structural studies and synthetic methodology development.
2. Peptidomimetics And SAR
Fmoc-D-His-OH serves as a chiral input for peptidomimetic construction and structure-activity relationship studies that require histidine functionality embedded in a D-amino acid context. The imidazole ring provides a chemically defined protonation state and coordination motif that can be tuned through neighboring residues and synthetic modifications. The Fmoc-protected D-amino acid format supports incorporation into constrained scaffolds, including cyclic peptides and backbone-modified analogs, where stereochemical inversion influences conformational preferences. Downstream derivatization of the imidazole can be applied to generate SAR libraries, enabling systematic evaluation of side-chain electronics and binding-relevant features in amino acid substitution patterns.
3. Chemical Biology Labeling
Fmoc-D-His-OH is suitable for chemical biology workflows that rely on histidine-mimetic recognition and controlled conjugation chemistry. The imidazole side chain can be exploited for metal-affinity tagging strategies or for orthogonal functionalization routes that introduce handles for labeling, enrichment, or immobilization. The Fmoc carbamate supports controlled peptide synthesis prior to conjugation, allowing generation of defined D-histidine-containing probes with consistent stereochemistry. The resulting labeled peptides or conjugates can be used as research reagents for studying molecular interactions, receptor binding modes, or protein surface engagement where imidazole-bearing motifs participate in recognition.
4. Protein Engineering
Fmoc-D-His-OH supports protein engineering and protein-interaction research by enabling site-specific incorporation of D-histidine residues into synthetic peptides used as surrogates for engineered protein segments. The D configuration at the alpha carbon provides a stereochemically defined perturbation to local backbone geometry without changing the histidine side-chain identity. The Fmoc-protected amino group and carboxylic acid allow assembly of peptide fragments that can be used for mapping interaction interfaces, testing binding hypotheses, or benchmarking computational models. Imidazole-dependent chemistry can be leveraged for metal binding assays, pH-responsive behavior in vitro, or for designing peptide segments that emulate histidine-driven recognition features in engineered biomolecular systems.
5. Process Chemistry Intermediate
Fmoc-D-His-OH functions as a protected amino acid intermediate for fine chemical synthesis and process chemistry routes that require reproducible handling of a chiral histidine derivative. The Fmoc protecting group provides a stable, orthogonal protection strategy for the amino functionality during coupling chemistry, while the carboxylic acid enables controlled activation to form amide linkages in manufacturing-relevant peptide intermediate preparation. The defined D-stereochemistry supports consistent stereochemical outcomes in downstream syntheses of D-histidine-containing peptides and analogs, reducing variability in stereopure product streams. Imidazole reactivity can be addressed through appropriate protection or derivatization logic, enabling scalable preparation of functionalized amino acid derivatives and peptide building blocks used in applied chemical production.
If you have any peptide synthesis requirement in mind, please do not hesitate to contact us at . We will endeavor to provide highly satisfying products and services.
Creative Peptides is a trusted CDMO partner specializing in high-quality peptide synthesis, conjugation, and manufacturing under strict cGMP compliance. With advanced technology platforms and a team of experienced scientists, we deliver tailored peptide solutions to support drug discovery, clinical development, and cosmetic innovation worldwide.
From custom peptide synthesis to complex peptide-drug conjugates, we provide flexible, end-to-end services designed to accelerate timelines and ensure regulatory excellence. Our commitment to quality, reliability, and innovation has made us a preferred partner across the pharmaceutical, biotechnology, and personal care industries.
Read More