Fmoc-D-9-Anthrylalanine

Fmoc-D-9-Anthrylalanine is a chiral, N-(9H-fluorenylmethoxycarbonyl) protected amino acid derivative in which the side chain is substituted with a 9-anthryl (anthracene-like) aromatic group. The molecule contains an Fmoc-protected α-amino functionality for base-labile deprotection, a carboxylic acid handle for peptide bond formation, and a rigid, hydrophobic polycyclic aromatic moiety that strongly influences sterics, fluorescence, and π-π interactions. The D stereochemistry at the α-carbon provides defined chiral control for incorporation into peptide sequences and for stereochemically sensitive SAR and binding studies. The anthryl side chain can participate in noncovalent recognition and can undergo further derivatization or serve as a spectroscopic tag, making the compound a practical intermediate for peptide building block preparation and downstream functionalization.

1. Peptide Synthesis

Fmoc-D-9-Anthrylalanine is used in solid-phase peptide synthesis and related protected amino acid chemistry as an Fmoc-compatible residue for stepwise chain assembly. The Fmoc group on the α-amine supports standard base-mediated deprotection strategies, while the carboxylic acid enables coupling to activated carboxyl derivatives to form amide bonds with controlled orientation of the D-configured stereocenter. The 9-anthryl side chain introduces a bulky aromatic substituent that can modulate local conformation, aggregation behavior, and side-chain packing in peptide sequences. Incorporation into peptide building blocks supports generation of anthryl-bearing peptides for mechanistic studies, scaffold diversification, and peptide analog construction where aromatic side-chain display is required.

2. Chemical Biology Probes

Fmoc-D-9-Anthrylalanine is applied in chemical biology workflows that require aromatic labeling or probe-like amino acid incorporation. The 9-anthryl group can function as a fluorescent or spectroscopically responsive tag, while the D-amino acid backbone provides stereochemical definition that can be important for binding-site recognition and enzymatic selectivity. The Fmoc-protected amine and carboxyl functionality allow controlled placement into peptides, enabling site-specific probe generation through peptide coupling chemistry rather than random post-labeling. Downstream peptide conjugates prepared from this residue can be used to interrogate molecular interactions, monitor conformational changes, or support structure-function studies in biomolecular systems.

3. Peptidomimetics And SAR

Fmoc-D-9-Anthrylalanine is suitable for peptidomimetic construction and structure-activity relationship studies where hydrophobic aromatic side chains are used to tune binding and permeability-related properties. The anthryl side chain provides a defined, rigid π-surface and hydrophobic character that can be systematically varied in position, enabling SAR mapping of aromatic contact points within peptide-like scaffolds. The D stereochemistry helps maintain consistent three-dimensional presentation of the α-substituted center, which can be critical when comparing analogs that differ only in absolute configuration. The protected amino acid format supports rapid synthesis of analog panels via protected amino acid synthesis and peptide coupling, facilitating iterative medicinal chemistry and molecular design campaigns.

4. Bioconjugation Handles

Fmoc-D-9-Anthrylalanine can be employed in bioconjugation chemistry to create peptide-based linkers and biomolecule-modifying reagents that incorporate a stable, aromatic side-chain motif. The anthryl substituent serves as a conjugation-compatible functional element that can be leveraged for noncovalent tagging, affinity-driven association, or spectroscopic tracking of conjugates, while the amino acid backbone enables incorporation into larger constructs through amide bond formation. The Fmoc-protected α-amine supports controlled assembly of conjugatable peptides and can be removed under standard deprotection conditions during synthesis of the final bioconjugation precursor. Resulting anthryl-containing conjugates can be used as analytical or research reagents for studying biomolecular localization, interaction dynamics, and conjugate behavior in applied biochemical research.

5. Process Chemistry Intermediate

Fmoc-D-9-Anthrylalanine is relevant to process chemistry and fine chemical synthesis as a chiral, protected amino acid intermediate for manufacturing peptide building blocks and specialty research reagents. The Fmoc-protected amine provides a stable protection strategy during handling and upstream synthesis, while the carboxylic acid functionality supports conversion into activated coupling forms for downstream peptide coupling steps in a controlled manufacturing sequence. The D stereocenter and the chemically robust 9-anthryl aromatic group support reproducible incorporation into peptide sequences and peptidomimetic intermediates without requiring late-stage stereochemical adjustment. Industrial utilization can include preparation of anthryl-substituted peptide libraries, custom reagent production for biochemical assays, and scalable supply of chiral amino acid derivatives for specialty chemical production.

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