Fmoc-D-MePhe-OH

Fmoc-D-MePhe-OH is an Fmoc-protected D-configured amino acid bearing a phenyl side chain with a methyl substituent (D-2-methylphenylalanine motif). The molecule contains a chiral alpha carbon adjacent to the carboxylic acid, enabling stereochemically defined peptide bond formation while the Fmoc carbamate masks the alpha amine during solid-phase or solution-phase coupling. The free carboxylic acid supports conversion to activated esters or amide-forming derivatives, and the aromatic side chain provides a hydrophobic, π-rich handle for incorporation into peptide scaffolds and peptidomimetics. The presence of the stable Fmoc group also supports orthogonal protection strategies where selective deprotection and subsequent coupling steps are required for multistep synthesis.

1. Peptide Synthesis

Fmoc-D-MePhe-OH is used as a chiral, Fmoc-protected amino acid building block for peptide synthesis in research and manufacturing settings. The D-stereochemistry and methyl-substituted phenyl side chain influence backbone conformation and local steric environment, while the Fmoc carbamate enables controlled N-deprotection and iterative coupling. The free carboxylic acid functionality can be activated to form peptide bonds with protected amino partners, supporting stepwise assembly of D-amino acid-containing peptides and peptide analogs. Downstream, the resulting peptides can serve as defined standards for peptide chemistry workflows, as well as as intermediates for larger scaffold construction in applied synthetic chemistry.

2. Peptidomimetics And SAR Studies

Fmoc-D-MePhe-OH supports peptidomimetic construction and structure-activity relationship studies by introducing a stereodefined D-amino acid residue with a hydrophobic, aromatic side chain. The methyl substitution on the phenyl ring can modulate binding pocket shape and aromatic contact patterns in peptide-derived ligands, while the carboxyl group enables incorporation into amide-linked frameworks. Fmoc protection allows sequential introduction of this residue within constrained peptide-like architectures, supporting the generation of analog series with controlled stereochemical variation. The resulting D-MePhe-containing compounds can be used as biochemical research intermediates for SAR mapping and for refining molecular design hypotheses in medicinal chemistry programs.

3. Chemical Biology Labeling

Fmoc-D-MePhe-OH can be employed in chemical biology workflows where D-amino acid incorporation improves stability of peptide conjugates and facilitates defined labeling strategies. The aromatic side chain provides a rigid hydrophobic element that can be retained through peptide coupling, while the carboxylic acid enables formation of amide linkages to functional handles such as linkers or reporter-bearing moieties. Fmoc-based peptide assembly supports the preparation of site-defined conjugation precursors, including peptide fragments that can later be functionalized through side-chain or terminal modifications. Downstream, D-MePhe-containing peptide conjugates can serve as analytical or mechanistic probes in biochemical research and as defined intermediates for specialty chemical production of labeled biomolecule reagents.

4. Protected Amino Acid Intermediates

Fmoc-D-MePhe-OH functions as a protected amino acid intermediate for stereochemically controlled synthesis of D-amino acid derivatives and peptide building block preparation. The Fmoc carbamate provides a stable N-protection strategy compatible with common peptide coupling chemistries, while the free carboxyl group supports conversion to activated species for amide bond formation. The chiral D-configuration is preserved through coupling steps, enabling downstream generation of N-terminally protected or C-terminally modified analogs through controlled deprotection and functional group transformations. The compound's defined structure also makes it suitable for process chemistry intermediate preparation where consistent stereochemical identity is required across multistep manufacturing routes.

5. Pharmaceutical Manufacturing Intermediates

Fmoc-D-MePhe-OH is applicable to pharmaceutical manufacturing workflows that require reproducible synthesis of D-amino acid-containing peptide intermediates. The Fmoc-protected amine and carboxylic acid enable integration into protected peptide sequences using standard peptide chemistry operations, supporting scalable production of defined peptide fragments for further processing. The methyl-substituted aromatic side chain can be incorporated to tune hydrophobicity and conformational preferences of peptide intermediates used in downstream formulation or derivatization steps. The resulting D-MePhe-containing peptide building blocks can be carried forward as controlled-structure inputs for specialty chemical production and applied industrial synthesis of peptide-based materials and intermediates.

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