Boc-3-Methoxy-L-Phenylalanine is a Boc-protected amino acid derivative classified as a substituted phenylalanine in which the aromatic side chain bears a 3-methoxy substituent. The molecule contains an N-terminal tert-butoxycarbonyl (Boc) protecting group on the amino functionality and a free carboxylic acid, with stereochemistry indicated as L at the α-carbon and a methoxy-substituted benzyl side chain that provides an ether functional group for controlled polarity and hydrogen-bonding behavior. As a protected amino acid building block, it is used in peptide synthesis where Boc protection supports stepwise coupling at the amino terminus while the 3-methoxy aromatic side chain is retained for incorporation into peptide analogues and structure-activity or labeling studies.
CAT No: CP15404
Boc-3-Methoxy-L-Phenylalanine is a Boc-protected L-phenylalanine derivative featuring a 3-methoxy substituent on the aromatic side chain. This protected amino acid building block is used in peptide and peptidomimetic synthesis where the Boc group supports controlled N-terminal assembly and the 3-methoxy aromatic functionality provides a defined steric and electronic environment for downstream structure-activity relationship studies. Researchers select this derivative to introduce a methoxy-substituted phenylalanine residue with a stable, synthesis-ready protection pattern.
1. Solid-Phase Peptide Synthesis
Boc-3-Methoxy-L-Phenylalanine is commonly used as an Fmoc-free, Boc-protected amino acid building block for solid-phase peptide synthesis workflows that rely on Boc-compatible coupling and deprotection strategies. Peptide chemistry groups use it to incorporate a 3-methoxy-phenylalanine residue into peptide libraries, enabling systematic variation of aromatic substitution patterns while maintaining a consistent protected backbone for stepwise chain elongation. The methoxy substituent on the side chain helps define local polarity and aromatic electronics in the growing sequence, which is particularly useful when building peptide segments for binding studies, structure-function mapping, or conformational profiling.
2. Peptidomimetic And SAR Building Blocks
Boc-3-Methoxy-L-Phenylalanine supports medicinal chemistry and chemical biology programs that prepare peptidomimetic analogs and SAR series featuring substituted phenylalanine motifs. Medicinal chemistry teams use this residue to tune aromatic ring substitution effects—such as altered hydrogen-bond acceptor capacity and steric demand—without changing the core amino acid stereochemistry. By starting from a Boc-protected, synthesis-ready intermediate, developers can generate consistent analog sets for downstream coupling to scaffolds, fragment assembly, and comparative evaluation of structure-activity relationships.
3. Modified Residue Peptide Segments
Boc-3-Methoxy-L-Phenylalanine is frequently selected for the preparation of modified-residue peptide segments where precise incorporation of a 3-methoxy substituted aromatic side chain is required. Protein engineering and peptide research groups use it to study how aromatic substitution influences helix/turn preferences, local hydrophobicity, and side-chain orientation within short peptides and constrained constructs. The Boc protection pattern enables reliable handling during segment synthesis and purification, making it a practical choice for assembling peptides that later undergo additional functionalization steps or are used as reference materials in comparative experiments.
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