Fmoc-3-Methoxy-D-Phenylalanine is an Fmoc-protected, D-configured phenylalanine derivative bearing a 3-methoxy substituent on the aromatic ring, placing it in the class of modified amino acids used for peptide building blocks. The molecule contains an Fmoc carbamate protecting group on the amino functionality and a free carboxylic acid for coupling, while the side chain features a benzyl-like aromatic ring with an electron-donating methoxy group that can influence hydrophobicity and aromatic interactions. In synthesis, it is employed as a protected amino acid intermediate for stepwise peptide assembly, including solid-phase peptide synthesis, and the methoxy-bearing aromatic residue provides a handle for structure-activity and binding studies where altered side-chain electronics and sterics are relevant.
CAT No: CP15407
Fmoc-3-Methoxy-D-Phenylalanine is a D-configuration, Fmoc-protected phenylalanine derivative in which the side chain bears a 3-methoxy substituent on the aromatic ring. The molecule contains an Fmoc carbamate on the amino group, a carboxyl functionality masked as a coupling-ready form consistent with standard protected amino acid building blocks, and a chiral center that supports stereochemically defined incorporation into peptides. The aromatic ether (aryl-OCH3) modulates polarity and electronic character, enabling controlled participation in peptide SAR libraries and downstream functional transformations such as demethylation or electrophilic aromatic substitution. The presence of the Fmoc group supports orthogonal protection strategies for stepwise peptide assembly and provides compatibility with common peptide coupling and base-mediated deprotection workflows.
1. Peptide Synthesis
Fmoc-3-Methoxy-D-Phenylalanine is used in peptide building block workflows where D-amino acid incorporation is required to tune proteolytic stability and conformational preferences. The Fmoc-protected amine and amino acid backbone enable standard peptide coupling chemistry to form amide bonds while preserving the D stereocenter during sequential chain elongation. The 3-methoxy substituted phenyl side chain provides an aromatic handle that can influence hydrophobic packing, hydrogen-bonding patterns through ether oxygen acceptor behavior, and aromatic microenvironment effects. The resulting D-aryl ether-containing peptides can be assembled for scaffold generation, analog libraries, and mechanistic studies in peptide science. The compound's protected amino acid format also supports reproducible intermediate handling in synthetic organic chemistry and peptide manufacturing routes.
2. Peptidomimetics And SAR Studies
Fmoc-3-Methoxy-D-Phenylalanine is applied in peptidomimetic construction and structure-activity relationship studies where aromatic side-chain electronics and stereochemistry are key determinants. The D-configuration at the alpha carbon can be leveraged to modulate backbone orientation and receptor or target binding geometry in SAR panels while the 3-methoxy group adjusts electron density and local polarity around the aromatic ring. The Fmoc-protected amino acid format facilitates rapid generation of analog series via iterative peptide assembly, including late-stage diversification when the aryl ether is carried through as a stable substituent. Downstream, the aryl methoxy group can be transformed to other phenolic or substituted aromatic motifs after peptide assembly, enabling comparative studies of substituent effects. This makes the compound suitable for medicinal chemistry-oriented peptide analog synthesis and for mapping structure-function relationships in amino acid-derived scaffolds.
3. Side-Chain Functionalization
Fmoc-3-Methoxy-D-Phenylalanine is suitable for side-chain functionalization strategies that exploit the aryl ether as a chemically addressable handle. The 3-methoxy substituent can participate in controlled demethylation to generate a phenolic group, providing a new site for further derivatization such as conjugation, metal coordination, or covalent modification chemistry depending on the downstream target. The D-amino acid stereocenter and the aromatic ring maintain a defined spatial arrangement that can be preserved through protection and deprotection cycles during synthetic elaboration. The Fmoc group supports orthogonal handling during the conversion of the side chain after peptide or intermediate formation, allowing separation of backbone assembly from aromatic functional transformation. The resulting functionalized amino acid derivatives and peptide analogs can serve as intermediates for fine chemical synthesis and for generating chemically diverse libraries from a single chiral precursor.
4. Chemical Biology And Protein Engineering
Fmoc-3-Methoxy-D-Phenylalanine is applied in chemical biology and protein engineering contexts where D-amino acid residues are incorporated into peptides or protein segments to probe recognition, stability, and binding interfaces. The Fmoc-protected amino acid enables controlled incorporation into synthetic peptides used as probes, mimics, or binding reagents, while the 3-methoxy phenyl side chain contributes an ether oxygen that can influence local interactions and solvent exposure. The D stereochemistry can help resist enzymatic degradation, supporting longer-lived probe molecules for interaction studies and comparative binding analyses. The protected amino acid format also supports systematic variation of residue position within a sequence, enabling targeted studies of how aromatic substituent electronics and stereochemical configuration affect molecular recognition. Downstream, the aryl ether motif can be converted to alternative aromatic functionalities to refine interaction patterns in engineered biomolecular constructs.
5. Pharmaceutical Manufacturing Intermediate
Fmoc-3-Methoxy-D-Phenylalanine is useful as a chiral, Fmoc-protected amino acid intermediate for industrial peptide and peptidomimetic manufacturing workflows that require stereodefined building blocks. The Fmoc carbamate protection strategy supports scalable solid-phase or solution-phase peptide assembly concepts, while the D-phenylalanine stereocenter provides a controlled stereochemical input for manufacturing-defined sequence specifications. The 3-methoxy aromatic side chain can be carried through as a stable substituent during assembly and can later be transformed to other aromatic functionalities as part of a defined downstream synthetic route. The compound's protected format facilitates handling as a discrete intermediate with predictable deprotection behavior under base-mediated conditions commonly used in peptide processing. This aligns with process chemistry intermediate preparation and specialty chemical production where consistent chiral building blocks are required for reproducible peptide analog generation.
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