Fmoc-5-Ava-OH

Fmoc-5-Ava-OH is a fluorenylmethoxycarbonyl (Fmoc) protected amino acid derivative of 5-aminovaleric acid (5-Ava), featuring an Fmoc-carbamate on the α-amino group and a free carboxylic acid for controlled peptide coupling. The molecule contains a five-carbon aliphatic side chain terminating in a terminal amine, enabling orthogonal functionalization and subsequent side-chain chemistry without disturbing the peptide-ready α-carboxyl group. The stereochemical element is governed by the chiral α-carbon typical of amino acid building blocks, allowing stereodefined incorporation into peptide sequences during solid-phase synthesis. The combination of an Fmoc-protected amine, a free α-carboxyl group, and a side-chain primary amine provides a reactivity profile suitable for protected amino acid synthesis, selective derivatization, and downstream formation of amide, urea, and salt-forming derivatives.

1. Peptide Synthesis

Fmoc-5-Ava-OH supports peptide building block preparation for solid-phase peptide synthesis and solution-phase coupling, where the Fmoc group serves as a base-labile N-protecting strategy to enable stepwise chain assembly. The free carboxylic acid participates in standard amide bond formation, while the side-chain primary amine can be left protected or selectively transformed depending on the orthogonality plan. Incorporation of the aliphatic 5-aminovaleric motif can introduce flexible spacing and terminal basic functionality within peptide scaffolds, including sequences designed for receptor binding studies or enzyme substrate mapping. The resulting peptidic intermediates and fully assembled peptides can be further modified at the side-chain amine to generate analog series for structure-activity relationship studies, maintaining compatibility with amino acid chemistry workflows.

2. Side-Chain Functionalization

Fmoc-5-Ava-OH enables amino acid derivatization through its terminal side-chain amine, which can undergo acylation, sulfonylation, reductive amination, or carbamoylation to generate functional groups for molecular recognition tuning. The Fmoc-protected α-amino group provides a controlled handle during initial coupling steps, while orthogonal protection of the side-chain amine can be applied when selective transformations are required after peptide assembly. The resulting N-functionalized derivatives can be used to introduce linkers, reactive electrophiles, or handle groups for subsequent conjugation chemistry, including formation of stable amide or urea linkages. Downstream synthetic utility includes preparing functionalized amino acid intermediates for peptidomimetic construction and for generating libraries of side-chain-modified peptides used in biochemical research.

3. Bioconjugation Chemistry

Fmoc-5-Ava-OH can be applied in bioconjugation chemistry workflows where the terminal primary amine serves as a reactive site for coupling to activated carboxylates, activated esters, isothiocyanates, or aldehyde-derived linkages. The Fmoc-protected amino acid derivative format allows controlled incorporation into peptide carriers or linker peptides, after which side-chain amine functionalization can be used to install conjugation-ready moieties while preserving peptide integrity. The aliphatic spacer length associated with 5-aminovaleric acid can influence conjugate solubility and accessibility of the attachment point, which is relevant for designing conjugates for chemical biology experiments. The compound's structure supports preparation of peptide-based linkers and intermediate fragments that can be carried into downstream labeling, immobilization, or conjugate synthesis for analytical and research applications.

4. Chemical Biology Probes

Fmoc-5-Ava-OH is suitable for chemical biology research intermediate preparation, particularly when a peptide probe requires a defined basic side-chain and a chemically addressable amine for probe maturation. The protected amino acid derivative format supports incorporation into short peptides or peptidomimetic fragments, where the Fmoc strategy enables sequential assembly while the terminal side-chain amine can be used to tune charge density or introduce affinity elements. Selective side-chain derivatization can generate probe variants for mapping binding interfaces, studying biomolecular interactions, or constructing labeled peptide reagents for mechanistic assays. The resulting probe scaffolds leverage amino acid stereodefined incorporation and functional-group reactivity to support systematic molecular design and SAR studies in applied biochemical research.

5. Pharmaceutical Manufacturing Intermediates

Fmoc-5-Ava-OH can serve as a process chemistry intermediate for manufacturing peptide-like intermediates, where the Fmoc protecting-group strategy supports reproducible peptide coupling operations and controlled deprotection steps. The presence of a free carboxylic acid and a terminal primary amine allows conversion into downstream amide-forming intermediates, including linker components used in drug substance or drug product manufacturing for peptide conjugates and peptidomimetic structures. The aliphatic side chain provides a flexible spacer that can be engineered into manufacturing routes to adjust solubility, conjugation density, or formulation-relevant properties of peptide-derived materials. The compound's compatibility with protected amino acid synthesis and orthogonal functional group planning makes it applicable to fine chemical synthesis and specialized chemical production where peptide-building blocks are processed at scale.

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