H-D-Tyr(Propargyl)-OH is a D-configured tyrosine-derived amino acid derivative bearing an O-propargyl substituent on the phenolic side chain, with the α-amino and α-carboxyl groups retained for amino acid chemistry. The molecule features a free carboxylic acid and an N-terminal amino group (as indicated by the H- prefix), while the tyrosine phenol is converted to a propargyl ether that provides a terminal alkyne functional handle for chemical conjugation and labeling. In synthesis and chemical biology workflows, this alkyne-bearing amino acid is used as a building block for incorporating tyrosine analogues into peptide or peptidomimetic structures and for downstream click-type bioconjugation strategies or analytical tagging where an alkyne functionality is required.
H-D-Tyr(Propargyl)-OH is a deuterated, chiral amino acid derivative featuring a D-configuration at the alpha stereocenter and a phenolic side chain bearing a propargyl substituent, presented as the free carboxylic acid with an N-terminal deuterated amine. The molecule combines a tyrosine backbone with a protected-reactivity handle in the form of an alkyne (propargyl ether), while retaining the aromatic ring that can participate in hydrogen-bonding and π-interactions relevant to peptide recognition. The presence of the propargyl group enables chemoselective transformations typical of terminal or masked alkynes, including click-type conjugation after appropriate functionalization. The stereodefined D-amino acid and the deuterium label make it suitable as a chiral tracer and mechanistic probe in amino acid derivatization, peptide coupling, and analytical studies where isotopic identity and stereochemical integrity are required.
1. Peptide Synthesis
H-D-Tyr(Propargyl)-OH serves as a stereodefined tyrosine-based peptide building block for solid-phase or solution-phase peptide assembly where D-amino acid incorporation is required for protease resistance profiling. The free carboxylic acid and the deuterated amino functionality can be converted into coupling-ready derivatives, while the propargyl ether on the phenolic side chain provides an orthogonal functional handle that survives standard peptide coupling conditions. The aromatic tyrosine motif supports side-chain-directed conformational effects in peptide scaffolds, and the D-configuration enables controlled stereochemical outcomes in peptide analog libraries. Downstream, propargyl-bearing peptide intermediates can be further derivatized for conjugation, crosslinking, or post-coupling functionalization to generate peptide probes and peptidomimetic constructs.
2. Bioconjugation Chemistry
H-D-Tyr(Propargyl)-OH is applied in chemical biology workflows that require site-specific conjugation through alkyne reactivity, leveraging the propargyl group as a handle for bioorthogonal ligation strategies. The tyrosine-derived aromatic ether maintains aqueous-compatible chemical behavior while the alkyne functionality enables conjugation to azide-bearing partners under mild conditions after appropriate activation or exposure of the reactive alkyne. The D-amino acid stereochemistry can be used to modulate stability and reduce enzymatic turnover in labeled biomolecule analogs, supporting mechanistic studies of binding and trafficking. The deuterium label further supports mass-based tracking in conjugate formation and subsequent analytical readouts, connecting amino acid derivatization to downstream biomolecule labeling pipelines.
3. Protease Resistance Studies
H-D-Tyr(Propargyl)-OH supports peptide stability and enzyme-substrate investigations by introducing a D-tyrosine element with a functionalized side chain that can be monitored during degradation or binding assays. The D-configuration at the alpha carbon changes stereochemical recognition by proteases, while the propargyl ether on the phenolic ring provides a non-amide functional group that can be retained as a tracer or used for post-degradation analysis. The aromatic tyrosine framework can participate in noncovalent interactions that influence substrate conformations, enabling structure-function interrogation of how stereochemistry and side-chain substitution affect cleavage patterns. The resulting peptide analogs and degradation products can be used as analytical standards and mechanistic probes in amino acid chemistry and peptide science.
4. Clickable Peptidomimetics
H-D-Tyr(Propargyl)-OH is suitable for peptidomimetic construction where an alkyne-bearing tyrosine side chain enables modular assembly of functional scaffolds. The propargyl ether provides a chemically addressable moiety that can be incorporated early in the synthesis and carried through peptide coupling steps, supporting late-stage diversification into conjugates, cyclized structures, or multivalent display formats. The deuterated, D-amino acid backbone supports stereochemical control in analog design, helping differentiate stereoisomer-dependent behavior in SAR studies and receptor-binding assays. Downstream synthetic utility includes conversion into coupling derivatives and use as a defined intermediate for generating clickable peptide analogs and chemically modified biomolecule mimics.
5. Isotope-Labeled Analytical Standards
H-D-Tyr(Propargyl)-OH is used in analytical research as an isotopically labeled amino acid standard for LC-MS method development, stereochemical verification, and quantitative tracer studies in peptide and amino acid workflows. The deuterium label provides distinguishable mass signatures, while the D-configuration allows discrimination of stereoisomeric incorporation during protected amino acid synthesis and peptide coupling. The propargyl-functionalized tyrosine side chain can be used to monitor derivatization steps and post-coupling transformations that involve alkyne chemistry, improving traceability of synthetic intermediates. The compound's defined structure supports downstream preparation of calibration materials and reference fragments used for confirming identity, purity by structural assignment, and reaction completeness in applied peptide chemistry and process development.
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