Fmoc-L-9-Anthrylalanine

Fmoc-L-9-Anthrylalanine is an Fmoc-protected L-amino acid derivative in which the alanine stereocenter is fixed as L, and the side chain is replaced by a 9-anthryl (anthracene-like) aromatic substituent. The molecule contains a fluorenylmethoxycarbonyl (Fmoc) carbamate on the α-amino group and a free carboxylic acid, enabling standard peptide coupling while preserving the aromatic anthracene chromophore for spectroscopic and recognition-driven studies. The extended π-system of the anthryl group supports strong UV/fluorescence behavior and can participate in π-π interactions, while the carboxylic acid provides a handle for amide formation or conversion into activated intermediates. As a chiral, protected amino acid building block, it functions as a stable intermediate for peptide construction and downstream derivatization of aromatic side-chain functionality.

1. Peptide Synthesis

Fmoc-L-9-Anthrylalanine is used in solid-phase and solution-phase peptide synthesis where the Fmoc carbamate protects the α-amino group during chain assembly and the free carboxylic acid supports amide bond formation at the coupling stage. The L-configuration at the alanine α-carbon provides stereochemical control that is retained through standard peptide coupling and deprotection cycles. The 9-anthryl side chain acts as an aromatic residue that can be incorporated into peptide sequences to introduce fluorescence and hydrophobic/aromatic contact points for molecular recognition studies. Resulting anthryl-containing peptides can be prepared for structure-activity relationship studies, binding assays, and mechanistic investigations that rely on an intrinsic chromophore embedded in the peptide backbone.

2. Chemical Biology Probes

Fmoc-L-9-Anthrylalanine is applied in chemical biology as a fluorescent or π-interaction reporter residue for monitoring conformational changes, binding events, and microenvironment effects within peptide-based probes. The anthryl aromatic substituent provides a built-in spectroscopic handle, while the amino acid backbone and carboxyl functionality enable incorporation into peptides, peptidomimetics, or constrained scaffolds that mimic native interaction motifs. Fmoc protection supports controlled assembly of probe sequences, and subsequent deprotection and coupling can generate conjugatable or assay-ready constructs. Downstream derivatives may include labeled peptide analogs used in binding characterization, competition assays, and mechanistic studies of biomolecular interactions.

3. Bioconjugation Chemistry

Fmoc-L-9-Anthrylalanine is suitable for bioconjugation workflows that require an amino acid-derived aromatic tag for attaching recognition elements to proteins, polymers, or surfaces. The protected amino acid format facilitates stepwise synthesis of peptide linkers bearing the anthryl side chain, and the carboxylic acid can be transformed into activated ester or amide-forming intermediates during linker construction. The anthryl group can serve as a hydrophobic anchor and optical reporter, enabling conjugates that are trackable by fluorescence or UV detection. Resulting bioconjugates and labeled biomolecule constructs can be used in analytical research, binding studies, and materials-oriented labeling strategies that depend on stable aromatic side-chain incorporation.

4. Peptidomimetics And SAR

Fmoc-L-9-Anthrylalanine is employed in peptidomimetic design and structure-activity relationship studies where substitution of an alanine side chain with a 9-anthryl aromatic group modulates sterics, hydrophobicity, and π-π contacts. The stereodefined L-amino acid core supports consistent spatial presentation of the anthryl moiety within a peptide or peptidomimetic scaffold. Fmoc-based synthesis compatibility allows rapid generation of analog libraries by varying sequence context around the anthryl residue while maintaining a consistent protected amino acid chemistry. Downstream analogs can be used as SAR probes to map how aromatic side-chain placement influences binding patterns and interaction geometry in biomolecular assays.

5. Pharmaceutical Intermediate Preparation

Fmoc-L-9-Anthrylalanine is relevant to pharmaceutical intermediate preparation and specialty fine chemical synthesis where protected amino acids with stable aromatic side chains are required for building complex, sequence-defined intermediates. The Fmoc-protected α-amino group and carboxylic acid enable controlled conversion into peptide coupling-ready fragments, supporting manufacturing-friendly handling during protected intermediate storage and subsequent assembly steps. The anthryl functionality can be carried through synthetic sequences as a robust aromatic motif for later functional group transformations or for incorporation into larger intermediates used in medicinal chemistry campaigns. Resulting intermediates can serve as chiral, stereochemically defined components for constructing aromatic-rich peptide analogs and related small-molecule scaffolds used in applied synthetic chemistry.

6. Analytical Research Standards

Fmoc-L-9-Anthrylalanine is used to prepare analytical standards and reference materials for monitoring peptide synthesis, purification, and characterization by leveraging the anthryl chromophore's strong spectroscopic response. The defined L-stereochemistry and protected amino acid structure enable reproducible incorporation into short peptide sequences that can act as calibration or process-control markers. The Fmoc group supports consistent generation of derivatives during synthesis, while the anthryl side chain provides a detectable signal for HPLC/UV or fluorescence-based workflows. Downstream peptide standards derived from this building block can support method development, impurity profiling, and verification of sequence integrity in research and industrial peptide manufacturing contexts.

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