Fmoc-2,6-Dimethy-L-Phenylalanine is an Fmoc-protected amino acid derivative bearing a substituted phenylalanine scaffold with methyl substituents at the 2 and 6 positions of the aromatic ring and an L stereochemical configuration at the α-carbon. The molecule contains the Fmoc carbamate protecting group on the amino functionality and retains a free carboxylic acid for coupling, while the 2,6-dimethyl side chain provides increased steric bulk and hydrophobic character relative to unsubstituted phenylalanine. In peptide synthesis workflows, this protected analogue is used as a building block to introduce the sterically hindered, substituted phenylalanine residue into peptides and to support stepwise assembly where chemoselective activation of the carboxyl group is required.
CAT No: CP14106
Fmoc-2,6-Dimethy-L-Phenylalanine is an Fmoc-protected, chiral amino acid derivative in which the L-configuration at the stereogenic alpha carbon is retained for peptide coupling compatibility. The molecule contains a phenylalanine-derived aromatic side chain bearing two ortho methyl substituents at the 2 and 6 positions, creating a sterically biased, conformationally informative aryl environment. The Fmoc group masks the amino functionality for orthogonal solid-phase or solution-phase peptide assembly, while the carboxyl functionality is positioned for activation to form amide bonds. The combination of an N-protecting group, a reactive carboxyl handle, and a hindered, substituted aromatic side chain makes the compound suitable for controlled incorporation into peptides and for downstream derivatization of the aromatic microenvironment in synthetic and biochemical research.
1. Peptide Synthesis
Fmoc-2,6-Dimethy-L-Phenylalanine serves as a protected amino acid building block for stepwise peptide construction in automated solid-phase peptide synthesis and related coupling workflows. The Fmoc carbamate protects the alpha amino group during chain elongation, enabling selective deprotection and re-coupling while maintaining the L-stereochemistry at the incorporation site. The sterically encumbered 2,6-dimethylphenyl side chain can modulate local folding, solvent exposure, and aromatic packing, which is relevant when assembling peptides for structural studies or scaffold optimization. The resulting peptide products can be used as sequence-defined intermediates for further functionalization, including side-chain-driven conjugation and analog generation for structure-function mapping in amino acid chemistry.
2. Peptidomimetics Design
Fmoc-2,6-Dimethy-L-Phenylalanine supports peptidomimetic construction where substituted phenylalanine residues are used to tune hydrophobic surface area, steric shielding, and aromatic interaction patterns. The ortho-dimethyl substitution pattern can influence conformational preferences around the aromatic ring, enabling design of constrained or sterically protected aromatic motifs within peptide analogs. The Fmoc-protected amino acid format facilitates incorporation into larger synthetic sequences, allowing systematic variation of neighboring residues to probe molecular recognition features. Downstream, the incorporated residue can function as a stable aromatic handle for preparing analog libraries used in SAR studies, receptor-binding motif evaluation, and fragment-to-lead optimization workflows.
3. Side-Chain Functionalization
Fmoc-2,6-Dimethy-L-Phenylalanine is applicable to side-chain functionalization strategies that exploit the substituted aromatic ring as a chemical modification platform. The 2,6-dimethyl pattern provides steric control that can affect electrophilic aromatic substitution, oxidative transformations, or directed derivatization routes on the phenyl ring while the Fmoc group remains protected during early synthetic steps. After peptide assembly or selective deprotection, the aromatic residue can be carried into downstream chemistry to generate labeled or reactive derivatives for chemical biology and analytical tagging. The compound thus functions as an amino acid-based intermediate that links peptide-compatible synthesis to later-stage aromatic modification, supporting generation of functional conjugates and structurally defined research reagents.
4. Chemical Biology Labeling
Fmoc-2,6-Dimethy-L-Phenylalanine can be utilized in chemical biology research to introduce a defined, sterically biased aromatic residue into peptides, probes, and biomolecule-interacting constructs. The protected amino acid format enables controlled incorporation into sequence-defined ligands, while the substituted phenyl side chain can serve as a recognition element or as a site for orthogonal chemical modification depending on the chosen derivatization chemistry. The Fmoc group supports reproducible assembly of labeled peptides that can be used for binding assays, competition experiments, and mechanistic studies of molecular interactions. The resulting constructs provide a route to generate structurally consistent probes where aromatic microenvironment effects are encoded at the amino acid level for downstream biochemical investigation.
5. Pharmaceutical Manufacturing
Fmoc-2,6-Dimethy-L-Phenylalanine is suitable for pharmaceutical manufacturing workflows that require robust peptide intermediate preparation and reproducible amino acid building blocks for process chemistry. The Fmoc-protected nature aligns with established peptide synthesis strategies used to manufacture peptide-based reagents, reference standards, and manufacturing intermediates for active ingredient or process-related materials. The sterically substituted aromatic side chain can improve stability of certain peptide conformations and can be leveraged during scale-up to access defined sequence variants for formulation screening or analytical method development. The compound's role as a chiral, peptide-coupling-compatible intermediate supports controlled synthesis planning, enabling downstream conversion into larger peptide structures used in industrial chemical manufacturing contexts.
6. Analytical Research Standards
Fmoc-2,6-Dimethy-L-Phenylalanine can be employed in analytical research as a reference building block for LC-MS method development, peptide mapping, and quantitation of sequence-defined fragments. The presence of the Fmoc group and the distinctive 2,6-dimethylphenylalanine side chain provides a characteristic mass signature that can aid in unambiguous identification of incorporated residues and peptide fragments. The chiral alpha-center and protected amino acid structure support reproducible synthesis of standards used to validate chromatographic behavior, fragmentation patterns, and impurity profiles for peptide-related materials. The compound therefore functions as an amino acid chemistry tool that links protected amino acid synthesis to downstream analytical standard generation for quality control and research instrumentation workflows.
3. SERS spectrum of the peptide thymosin‐β4 obtained with Ag nanorod substrate
4. Implications of ligand-receptor binding kinetics on GLP-1R signalling
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