Boc-2,4-Dimethy-L-Phenylalanine is a Boc-protected, non-natural amino acid derivative featuring an L-phenylalanine backbone bearing two additional methyl substituents at the 2- and 4-positions of the aromatic side chain. The molecule contains a free carboxylic acid and an amino group masked as a tert-butoxycarbonyl (Boc) carbamate, with the substituted phenyl ring providing increased hydrophobic character and steric bulk relative to phenylalanine. As a protected amino acid building block, it is used in peptide synthesis workflows to control chemoselectivity at the amino functionality and to introduce the dimethyl-substituted aromatic residue into peptides for structure-property studies and chemical biology applications.
CAT No: CP13904
Boc-2,4-Dimethy-L-Phenylalanine is a Boc-protected, α-amino acid building block derived from L-phenylalanine with two additional methyl substituents at the 2- and 4-positions of the aromatic ring. This sterically and electronically modified side chain is commonly leveraged in peptide and peptidomimetic synthesis to probe structure-property relationships and to introduce conformational and hydrophobic character into target sequences. The Boc group supports its use as an N-protected amino acid unit in controlled peptide assembly workflows, while the substituted phenyl ring provides a defined aromatic motif for downstream medicinal chemistry and materials-oriented structure tuning.
1. Peptide Building Block
Boc-2,4-Dimethy-L-Phenylalanine is used as an N-Boc amino acid residue for custom peptide synthesis where a substituted phenylalanine side chain is required. Peptide chemists incorporate this residue into short peptides, SAR libraries, and backbone/side-chain modification studies to evaluate how ortho/para methyl substitution influences local sterics, aromatic packing, and overall peptide conformation. Because the amino terminus is protected, it integrates cleanly into standard peptide coupling strategies used in research-grade solid-phase or solution-phase assembly, enabling site-specific placement of this modified aromatic side chain within a defined sequence.
2. Peptidomimetic SAR Studies
Boc-2,4-Dimethy-L-Phenylalanine is frequently selected for peptidomimetic development and medicinal chemistry campaigns focused on structure-activity relationship (SAR) optimization. The 2,4-dimethyl substitution pattern provides a controlled way to modulate hydrophobic surface area and aromatic ring geometry compared with unsubstituted phenylalanine, supporting systematic comparisons across analog series. Researchers use this building block to generate analog peptides and constrained mimetics that help identify which side-chain steric and electronic features correlate with desired physicochemical profiles during lead optimization and hit-to-lead refinement workflows.
3. Protected Intermediate For Analog Synthesis
Boc-2,4-Dimethy-L-Phenylalanine serves as a convenient protected intermediate for preparing a range of substituted phenylalanine analogs used in downstream synthesis and library manufacturing. Synthetic teams rely on the Boc-protected amino functionality to manage chemoselectivity during sequential derivatization steps, such as side-chain functional elaboration or incorporation into longer synthetic fragments. This makes the reagent particularly useful for pharmaceutical intermediate development programs and custom synthesis providers that need a stable, well-defined amino acid unit for consistent analog production under controlled peptide-manufacturing conditions.
4. Aromatic Side-Chain Engineering
Boc-2,4-Dimethy-L-Phenylalanine supports protein and peptide engineering efforts that require engineered aromatic side-chain environments rather than standard phenylalanine. In chemical biology and structural studies, introducing a 2,4-dimethyl phenyl motif can help tune packing interactions and local steric constraints in designed peptides, supporting experiments that map how aromatic substitution affects folding propensity, oligomerization tendencies, or binding-site geometry in model systems. Researchers use this residue to create defined analogs for structure-function investigations where the aromatic ring substitution pattern is the key variable.
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