3,5-Dimethy-L-Phenylalanine is a naturally derived, proteinogenic amino acid analogue in which the phenylalanine side chain bears two methyl substituents at the 3 and 5 positions, maintaining the α-amino and α-carboxyl functionality of the parent amino acid. The molecule is presented as the L stereoisomer and features a hydrophobic, sterically modified aromatic side chain that can influence packing and side-chain interactions when incorporated into peptides. As a substituted phenylalanine derivative, it is used in peptide synthesis and structure-activity or structure-property studies to probe how aromatic ring substitution patterns affect peptide conformation, binding behavior, and analytical characteristics.
CAT No: CP14301
3,5-Dimethy-L-Phenylalanine is a L-configured, non-proteinogenic phenylalanine analog bearing two methyl substituents at the 3 and 5 positions of the aromatic ring. This sterically and electronically modified side chain makes it a useful amino acid building block for structure-property studies, peptide analog design, and medicinal chemistry programs where aryl substitution patterns are used to tune conformational preferences and physicochemical behavior. Researchers commonly select this reagent as a defined, chiral aromatic residue to introduce a bulky, hydrophobic ring environment into peptides and peptidomimetics during lead optimization and SAR work.
1. Peptide Analog Building Block
3,5-Dimethy-L-Phenylalanine is used as an aromatic amino acid building block for peptide synthesis and peptidomimetic construction, particularly when a substituted phenylalanine residue is needed to probe how ring sterics and hydrophobicity influence peptide structure and function. In custom peptide synthesis workflows, this residue is incorporated into short analogs, cyclic or constrained sequences, and SAR-focused libraries to generate well-defined variants with consistent stereochemistry at the alpha carbon. The 3,5-dimethyl substitution pattern is especially useful when researchers want to introduce a "shielded" aromatic surface that can alter local packing, aromatic interactions, and overall hydrophobic character compared with unsubstituted phenylalanine.
2. Medicinal Chemistry SAR Studies
3,5-Dimethy-L-Phenylalanine supports medicinal chemistry and lead-optimization efforts where aryl ring substitution is a controllable variable for improving developability-related properties in peptide-like scaffolds. Medicinal chemistry groups and CROs frequently employ this amino acid analog to prepare series of analogs that differ specifically at the substituted aromatic residue while keeping the rest of the scaffold constant. The defined L-configuration and the two methyl groups on the ring provide a reproducible way to modulate steric bulk and electronic environment, which is valuable for mapping structure-activity relationships and for selecting candidate structures for downstream biological evaluation.
3. Protein and Enzyme Engineering Probes
3,5-Dimethy-L-Phenylalanine is applied in chemical biology and protein engineering contexts where non-natural aromatic residues are introduced to interrogate structure-function relationships in proteins and enzymes. Researchers use this building block to generate modified peptide segments or protein constructs that incorporate a sterically encumbered aromatic side chain, enabling targeted studies of how local hydrophobic packing and aromatic surface accessibility affect binding interfaces, stability of folded motifs, or catalytic microenvironments. Because the reagent is a chiral, defined amino acid analog, it is often selected when the experimental design requires a consistent stereochemical and side-chain identity rather than a mixture of aromatic substitutions.
4. Chiral Amino Acid Intermediate Supply
3,5-Dimethy-L-Phenylalanine is also used as a specialized intermediate building block in industrial and research chemical manufacturing where substituted chiral aromatic amino acid motifs are required for downstream derivatization. Process development teams and specialty chemical manufacturers commonly rely on this defined L-amino acid analog to prepare further functionalized amino acid derivatives, peptide coupling components, or aryl-substituted intermediates used in larger synthesis campaigns. The presence of the 3,5-dimethyl substituted phenyl ring provides a stable, structurally specific handle for downstream transformations, supporting reproducible manufacture of stereodefined aromatic building blocks for research-grade and development-stage workflows.
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