Fmoc-4-Methoxy-L-Phenylalanine is an Fmoc-protected, L-phenylalanine-derived amino acid derivative bearing a para-methoxy substituent on the aromatic side chain, placing it in the class of protected amino acids used for peptide assembly. The molecule contains an Fmoc carbamate protecting the α-amino group and a free carboxylic acid, while the 4-methoxyphenyl side chain provides an ether functionality that can influence polarity and aromatic interactions. In synthetic peptide chemistry, this protected analogue is employed as a building block for incorporating a methoxy-substituted phenylalanine residue into peptides and for preparing labeled or structure-activity study variants through controlled stepwise coupling.
CAT No: CP15506
Fmoc-4-Methoxy-L-Phenylalanine is an Fmoc-protected L-phenylalanine derivative bearing a para-methoxy substituent on the aromatic side chain. The molecule combines an N-(9H-fluoren-9-ylmethoxycarbonyl) protecting group with an L-configured stereogenic center at the alpha carbon, providing a stable, chiral amino acid building block for stepwise peptide assembly. The methoxy-substituted phenyl ring introduces an electron-donating aromatic functionality that can participate in noncovalent interactions and can be selectively retained or transformed during downstream synthesis. The Fmoc carbonate and free carboxyl functionality (or corresponding activated form during coupling) support standard amino acid coupling chemistry while enabling controlled deprotection strategies to expose the amine for iterative chain elongation.
1. Peptide Synthesis
Fmoc-4-Methoxy-L-Phenylalanine is used in peptide building block preparation for solid-phase peptide synthesis and related protected amino acid chemistry. The Fmoc-protected alpha-amine and the L-stereochemistry at the chiral center align with routine peptide coupling workflows, while the para-methoxy phenyl side chain provides a defined aromatic motif for sequence-specific structure and hydrophobic packing. The aromatic methoxy group can influence local conformational preferences and can be carried through peptide assembly without disrupting the protection scheme. Deprotection of the Fmoc group during synthesis enables sequential N-terminal formation, supporting construction of peptide analogs and longer peptide fragments for biochemical research and materials-oriented peptide studies.
2. Peptidomimetics And SAR
Fmoc-4-Methoxy-L-Phenylalanine serves as a chiral precursor for peptidomimetic construction and structure-activity relationship studies in medicinal chemistry research. The protected amino acid framework supports incorporation of a para-methoxy aromatic side chain into peptide-like scaffolds where aromatic electronics and steric presentation affect binding-site complementarity. The methoxy substituent can be retained as a handle for later functional group transformation, such as oxidative demethylation or aromatic derivatization, enabling SAR-driven library synthesis. The stereochemical integrity of the L-alpha center helps maintain consistent spatial orientation of backbone and side-chain vectors across analog series, supporting reproducible comparisons in amino acid derivatization campaigns.
3. Chemical Biology Labeling
Fmoc-4-Methoxy-L-Phenylalanine is applicable to chemical biology workflows that require incorporation of aromatic residues into functional peptides and protein-modifying constructs. The Fmoc-protected amine enables controlled placement of the residue at specific positions, while the para-methoxy phenyl side chain provides a chemically stable, hydrophobic/aromatic element that can serve as a recognition feature or as a platform for subsequent conjugation chemistry. The aromatic ring can also function as a scaffold for attaching linkers or probes after peptide assembly, supporting downstream generation of labeled peptides used in binding assays, imaging reagent development, or mechanistic studies. Controlled deprotection and coupling compatibility make the residue suitable for building defined conjugation-ready intermediates in applied biochemical research.
4. Process Chemistry Intermediate
Fmoc-4-Methoxy-L-Phenylalanine is suitable for process chemistry intermediate preparation where protected amino acid derivatives are manufactured for downstream peptide and fine chemical synthesis. The Fmoc carbonate protection strategy provides a robust, isolable form that can be handled as a stable chiral reagent while maintaining compatibility with standard peptide coupling conditions after conversion to activated coupling forms. The para-methoxy substitution on the aromatic ring adds a defined functional pattern that can be carried through multi-step syntheses without interfering with the Fmoc deprotection logic. The resulting intermediate supports scalable production of chiral amino acid building blocks used in industrial peptide manufacturing and specialty chemical production, including batch-to-batch consistency for synthetic supply chains.
5. Analytical Standards
Fmoc-4-Methoxy-L-Phenylalanine can be employed as an analytical reference material for amino acid and peptide method development. The combination of a defined L-chiral center and a para-methoxy aromatic side chain provides a distinct chromatographic and mass spectrometric signature, while the Fmoc group supports detection strategies commonly used for protected amino acids and peptide intermediates. The residue can be used to validate derivatization, peptide coupling monitoring, or deprotection endpoints in analytical workflows that track Fmoc removal and subsequent amide bond formation. Reliable structural definition makes it useful for calibrating quantitative or qualitative assays that require unambiguous identification of amino acid-derived fragments in research and manufacturing quality control contexts.
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