Fmoc-D-Tyr(Me)-OH

Fmoc-D-Tyr(Me)-OH is an Fmoc-protected D-enantiomer of a methylated tyrosine derivative, featuring a phenolic side chain bearing a Me substituent and a stereogenic center at the amino acid α-carbon. The molecule contains an N-(9H-fluoren-9-ylmethoxycarbonyl) protecting group that masks the amino functionality for controlled peptide coupling, while the free carboxylic acid enables C-terminal activation and incorporation into growing peptide chains. The aromatic phenyl ring and phenolic oxygen provide a distinct reactivity profile compared with unsubstituted tyrosine, supporting tailored side-chain chemistry during peptide synthesis and downstream derivatization. The combination of chiral amino acid structure, protected amine, and functional side-chain oxygen makes Fmoc-D-Tyr(Me)-OH a chiral building block and intermediate suited to stereochemically defined peptide analog construction and chemical biology workflows.

1. Peptide Synthesis

Fmoc-D-Tyr(Me)-OH is used in automated and manual solid-phase peptide synthesis as an Fmoc-protected amino acid building block with a free carboxylic acid for amide bond formation. The D-configuration at the α-carbon supports stereochemically defined incorporation when coupling conditions activate the acid and form the peptide linkage under standard peptide coupling chemistries. The Fmoc carbamate provides orthogonal N-protection that can be removed under base to regenerate the reactive amine while preserving the side-chain functionality for subsequent steps. The methylated tyrosine side chain can be retained through chain assembly or used as a handle for later side-chain functionalization, enabling the preparation of D-amino acid containing peptides and peptidomimetics.

2. Side-Chain Functionalization

Fmoc-D-Tyr(Me)-OH supports side-chain derivatization strategies in synthetic organic chemistry and chemical biology by combining an aromatic ring with a phenolic oxygen that can participate in selective transformations. The methyl substitution on the tyrosine phenol can modulate hydrogen-bonding and steric access, which may influence conjugation efficiency and the stability of phenoxy-based linkages in downstream products. The protected amino group and free carboxylic acid allow orthogonal manipulation: side-chain chemistry can be performed either on the incorporated residue after peptide assembly or on the amino acid prior to coupling. The resulting derivatives can be applied to generate photoactive, affinity, or solubility-tuned peptide analogs and to access structure-defined conjugation motifs for biomolecule modification.

3. Peptidomimetics And SAR Studies

Fmoc-D-Tyr(Me)-OH is suitable for peptidomimetic construction and structure-activity relationship studies where stereochemistry and side-chain electronics are key variables. The D-tyrosine framework enables systematic exploration of conformational preferences and protease resistance patterns in peptide analog libraries, while the methylated phenolic side chain provides a controllable substitution pattern for tuning aromatic interactions. The Fmoc-protected amine supports sequential assembly of multi-residue analogs, including incorporation into mixed D/L sequences to probe position-specific effects. The amino acid derivative can be converted into a range of analogs for SAR workflows, including side-chain-modified peptides that maintain a consistent backbone while varying functional substituents.

4. Bioconjugation Chemistry

Fmoc-D-Tyr(Me)-OH can be applied in bioconjugation chemistry to introduce a defined D-tyrosine-derived motif into peptide linkers and conjugate scaffolds. The phenolic oxygen functionality enables formation of ether or ester-linked conjugates after appropriate activation or protection/deprotection planning, while the aromatic ring can support conjugate design through hydrophobic and π-interaction contributions. Fmoc protection ensures that N-functionalization occurs at the correct stage, allowing the amino acid to be incorporated into a peptide handle that later undergoes selective side-chain coupling to biomolecules. The resulting conjugates can serve as chemically defined intermediates for labeling reagents, affinity probes, and immobilized biomolecule constructs in biochemical research.

5. Pharmaceutical Manufacturing Intermediates

Fmoc-D-Tyr(Me)-OH is relevant to pharmaceutical manufacturing and process chemistry as a chiral, Fmoc-protected amino acid intermediate for producing D-amino acid containing peptide intermediates. The Fmoc carbamate strategy supports controlled N-protection during synthesis and facilitates reproducible deprotection steps that align with peptide manufacturing workflows. The free carboxylic acid enables standardized activation and coupling to peptide fragments, supporting scalable route design for complex peptide building blocks. The methylated tyrosine side chain can be carried through manufacturing steps to maintain a consistent chemical identity in the final peptide intermediate used for further processing into higher-order products.

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