Fmoc-Dbz-OH is an Fmoc-protected amino acid derivative featuring a dibenzylcarboxamide (Dbz) side chain attached to the amino acid backbone, with the amino and carboxyl functionalities present as part of the protected building block. The molecule contains an N-terminal 9-fluorenylmethoxycarbonyl (Fmoc) protecting group that masks the amino group to control chemoselectivity during stepwise peptide assembly, while the carboxyl group remains available for coupling and the Dbz substituent provides a benzylcarboxamide-bearing side-chain functionality. Fmoc-Dbz-OH is used as a protected amino acid precursor in peptide synthesis workflows and in the preparation of amide-containing peptide analogues for structure-activity studies, chemical biology labeling, and analytical method development.
CAT No: CP25142
CAS No:1071446-05-3
Synonyms/Alias:3-Fmoc-4-diaminobenzoic acid
Chemical Name:3-[(9-Fluorenylmethyloxycarbonyl)amino]-4-amino-benzoic acid
Fmoc-Dbz-OH is an Fmoc-protected amino acid derivative in which the dibenzyl (Dbz) side chain is attached to the amino acid backbone, yielding a stable, chiral building block suitable for stepwise peptide assembly. The molecule contains an N-(9H-fluoren-9-ylmethoxycarbonyl) protecting group on the amino functionality, a carboxylic acid for C-terminal coupling chemistry, and an aromatic, hydrophobic Dbz substituent that can influence folding, solubility, and binding-site interactions in peptide and peptidomimetic contexts. The Fmoc carbamate is designed for orthogonal deprotection under base-mediated conditions, while the free carboxylic acid permits activation to form amide bonds with controlled stereochemical outcomes at the coupling stage. Overall, the combination of protected amine, reactive acid, and aromatic side-chain functionality makes Fmoc-Dbz-OH a practical intermediate for protected amino acid synthesis and downstream peptide and medicinal chemistry workflows.
1. Peptide Synthesis
Fmoc-Dbz-OH is applied in solid-phase and solution-phase peptide synthesis where the Fmoc-protected amine supports iterative N-terminal deprotection and coupling cycles. The carboxylic acid group enables formation of peptide bonds after activation, while the Dbz side chain contributes hydrophobic and aromatic character that can be leveraged to tune local conformations and aggregation behavior of the growing peptide. The Fmoc group's base-labile carbamate chemistry supports compatibility with standard peptide coupling strategies and orthogonal protection schemes for other functional residues. Resulting peptide products can incorporate the Dbz-bearing residue for structure-activity relationship studies, peptide library construction, and generation of peptidomimetic scaffolds where aromatic side-chain presentation is required.
2. Protected Amino Acids
Fmoc-Dbz-OH serves as a protected amino acid building block for preparing N-protected derivatives used in controlled amino acid derivatization and intermediate staging. The Fmoc carbamate protects the amino functionality during side-chain functional group manipulations or during multi-step synthesis sequences that require the carboxylic acid to remain available for subsequent coupling or conversion to activated esters. The aromatic Dbz substituent can be retained through peptide assembly steps, enabling downstream transformations such as conversion to amide-linked analogs or incorporation into longer synthetic sequences without premature side reactions. The compound's protected/functional-group arrangement supports chiral amino acid intermediate workflows and facilitates reliable handling in fine chemical synthesis and peptide manufacturing settings.
3. Peptidomimetics And SAR
Fmoc-Dbz-OH is utilized in peptidomimetic construction and structure-activity relationship studies where aromatic side-chain density and hydrophobic surface area can be systematically varied. The Dbz side chain provides a rigid, benzyl-rich aromatic motif that may modulate binding interactions and conformational preferences when incorporated into analog series. The protected amine and free acid functionality allow incorporation into amide-linked backbones under standardized coupling conditions, supporting rapid generation of residue-scan variants. Downstream derivatives include analogs bearing modified N-termini or C-terminal functional groups, enabling medicinal chemistry teams to probe structure-function relationships with amino acid chemistry-compatible intermediates.
4. Bioconjugation Chemistry
Fmoc-Dbz-OH can be employed as a protected amino acid intermediate for bioconjugation workflows that require aromatic, hydrophobic amino acid residues embedded within conjugate scaffolds. The carboxylic acid can be converted into coupling-ready activated forms during synthesis of linkers or peptide-like carriers, while the Fmoc group supports controlled assembly of conjugation-ready sequences before final deprotection and functionalization. The Dbz aromatic side chain can enhance membrane affinity or promote hydrophobic interactions in conjugates designed for targeted molecular recognition in biochemical assays. Resulting conjugates may be used as chemically defined carriers, affinity probes, or labeling intermediates that rely on amino acid-derived amide linkages for stable attachment.
5. Pharmaceutical Intermediate Preparation
Fmoc-Dbz-OH is suitable for pharmaceutical intermediate preparation in the context of manufacturing peptide-based intermediates, where protected amino acid building blocks are staged for controlled coupling and subsequent deprotection. The Fmoc-protected amine supports manufacturing-friendly orthogonality, allowing sequential assembly of amino acid sequences while minimizing undesired side reactions from free amines. The free carboxylic acid enables conversion to activated derivatives for amide bond formation, supporting scalable synthesis of peptide fragments or peptidomimetic cores used in downstream drug discovery chemistry. The aromatic Dbz side chain can be retained through intermediate steps, supporting consistent scaffold construction for process chemistry and specialty chemical production focused on amino acid-derived intermediates.
6. Analytical Standards
Fmoc-Dbz-OH is applicable to analytical research and method development where chemically defined amino acid derivatives are needed as standards or reference materials for peptide-related assays. The presence of the Fmoc group and the Dbz aromatic side chain provides strong chromatographic and spectroscopic signatures that can support identification, purity assessment, and monitoring of deprotection or coupling steps in peptide synthesis workflows. The carboxylic acid functionality enables conversion into derivatives that match expected analytical targets, including amide-linked products and fragment standards. Incorporation of Fmoc-Dbz-OH into analytical calibration sets can improve traceability of amino acid derivative transformations and support robust characterization of peptide building block intermediates in applied biochemical research.
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