L-4-Methoxyphenylglycine is an L-configured amino acid derivative classified as a phenylglycine bearing a para-methoxy substituent on the aromatic ring, with the side chain consisting of a 4-methoxyphenyl group attached to the alpha carbon. The molecule contains a free amino group and a carboxyl group, enabling it to exist as a zwitterion under appropriate conditions, while the methoxy substituent provides an ether functionality that can influence polarity and aromatic electronic character during peptide coupling or analytical derivatization. In research and peptide chemistry, this amino acid is used as a substrate for incorporating a methoxy-substituted aromatic residue into peptides or as a building block for structure-activity studies and conformational or binding investigations that probe the effects of aromatic substitution patterns.
CAT No: CP10402
L-4-Methoxyphenylglycine is an L-configured amino acid analog featuring a benzylic glycine backbone substituted with a para-methoxyphenyl group, providing a chiral center at the alpha-carbon and a distinct aromatic side structure. The molecule contains a primary amino functionality and a carboxylic acid (or corresponding salt/derivative depending on handling), which together enable standard amino acid coupling chemistry and controlled protection strategies for peptide assembly. The para-methoxy substituent modulates aromatic electronics and can participate in downstream electrophilic aromatic substitution, oxidative transformations, or cross-coupling after appropriate functionalization. The combination of stereochemical rigidity, aromatic reactivity, and amino acid functionality makes L-4-Methoxyphenylglycine a practical chiral building block and derivatization intermediate for peptide science and fine chemical synthesis.
1. Peptide Synthesis
L-4-Methoxyphenylglycine is applied in peptide synthesis and peptidomimetic construction where an aromatic side-bearing glycine analog is required to tune backbone conformation and side-chain recognition. The amino acid's L-stereocenter and benzylic methoxyphenyl group support stereochemically defined incorporation using standard N-protection and C-terminal activation approaches. The carboxyl group and protected amine can be engaged in peptide coupling to generate amide linkages, while the aromatic methoxy substituent can remain stable under many coupling conditions or be selectively transformed later. Resulting peptide analogs and constrained glycine-containing sequences can be used to probe sequence-dependent properties and to build scaffolds for biochemical research and SAR workflows.
2. Chiral Amino Acid Derivatization
L-4-Methoxyphenylglycine serves as a chiral amino acid intermediate for stereoselective derivatization and downstream synthesis of functionalized aromatic amino acid derivatives. The para-methoxyphenyl motif enables controlled functional group interconversions such as oxidation, halogenation, or conversion to reactive handles for subsequent coupling chemistry, while the amino and carboxyl functionalities allow formation of amides, esters, or protected intermediates. Protecting-group strategies on nitrogen and oxygen-bearing functionalities can be selected to match the chemoselectivity requirements of multistep routes, including temporary masking during side-chain modification. The resulting derivatives can be used to generate libraries of chiral building blocks for synthetic organic chemistry, fragment elaboration, and structure-guided scaffold diversification.
3. Drug Discovery SAR Studies
L-4-Methoxyphenylglycine is utilized in drug discovery research as an amino acid-based fragment for SAR studies and molecular design of peptidomimetic ligands. The aromatic methoxyphenyl group provides a defined hydrophobic and electronic element, while the glycine-like backbone can influence conformational flexibility and binding-site complementarity when incorporated into larger constructs. The L-configuration supports stereochemical consistency across analog series, and the amino acid functionality enables conversion into N-protected intermediates suitable for iterative assembly or late-stage functionalization. Downstream derivatives prepared from this building block can be used in medicinal chemistry campaigns to map the impact of aromatic substitution and stereocenter retention on binding-relevant properties.
4. Bioconjugation Chemistry
L-4-Methoxyphenylglycine can be applied in chemical biology and bioconjugation workflows where amino acid-derived aromatic handles are needed for conjugate construction. The presence of an amino acid motif allows conversion into activated ester, amide-forming, or coupling-ready derivatives that can be linked to carrier proteins, peptides, or polymer backbones under controlled conditions. The para-methoxyphenyl group can serve as a stable aromatic tag for analytical tracking or as a precursor for further modification to introduce additional functional groups for conjugation. Conjugates built from this chiral amino acid analog can support biomolecule labeling, probe synthesis, and assay development in research settings that require structurally defined stereochemistry.
5. Process Chemistry Intermediate
L-4-Methoxyphenylglycine is suitable for process chemistry and fine chemical synthesis as a chiral intermediate that can be routed through protection, activation, and selective aromatic functionalization steps. The amino acid's bifunctional nature enables conversion into manufacturable derivatives such as N-protected amino acids, amino acid esters, or coupling-ready forms that align with scalable peptide-building-block supply chains. The para-methoxy substituent provides a chemically stable aromatic platform that can withstand many standard transformations, while still enabling downstream derivatization routes for generating specialized intermediates. Industrially relevant use cases include preparation of chiral amino acid building blocks for custom peptide synthesis, peptidomimetic manufacturing, and intermediate supply for specialty chemical production where stereochemical control is a key requirement.
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