H-D-Tyr(tBu)-allyl ester · HCl

H-D-Tyr(tBu)-allyl ester · HCl is a deuterated, D-configuration tyrosine derivative presented as an allyl ester hydrochloride salt, combining a chiral amino acid core with a phenolic side chain protected as a tert-butyl ether. The molecule contains an N-terminal benzylic-type hydrogen chloride salt form (as indicated by "· HCl"), which supports handling as a defined amine salt while retaining the protected phenol for chemoselective transformations. The D stereochemistry at the amino acid center provides stereochemical control for incorporation into peptide and peptidomimetic frameworks, while the allyl ester functions as an acid-labile but base-stable ester handle that can be selectively removed or converted under orthogonal conditions. The tert-butyl-protected phenol and ester functionality together enable controlled side-chain derivatization and downstream synthetic utility in protected amino acid synthesis and peptide coupling chemistry.

1. Peptide Synthesis

H-D-Tyr(tBu)-allyl ester · HCl is suitable for peptide building-block workflows where a protected tyrosine residue must be introduced with preserved stereochemistry. The D-tyrosine backbone provides a chiral amino acid unit for amide bond formation, while the allyl ester can serve as a temporary C-terminal protection strategy compatible with peptide coupling sequences. The tert-butyl-protected phenol supports orthogonal protection during assembly, allowing selective deprotection or side-chain functionalization after chain elongation. The resulting protected residue can be employed to construct D-amino-acid-containing peptides used in structural studies, stability-focused analog libraries, and peptide chemistry investigations that require controlled tyrosine chemistry.

2. Side-Chain Functionalization

H-D-Tyr(tBu)-allyl ester · HCl supports side-chain modification strategies centered on the tyrosine phenolic functionality. The tert-butyl ether mask on the phenol enables chemoselective transformations at the ester or backbone while preventing premature phenol reactivity during coupling and intermediate handling. The allyl ester provides a removable C-terminal group that can be converted to carboxylate equivalents for subsequent activation, enabling iterative synthesis of tyrosine-containing derivatives. Downstream, deprotection of the tert-butyl ether can unlock phenolic reactivity for conjugation handles, oxidative coupling routes, or formation of tyrosine-based aromatic motifs used in peptidomimetics and chemical biology probes.

3. Chiral Building Block Development

H-D-Tyr(tBu)-allyl ester · HCl functions as a stereochemically defined chiral amino acid intermediate for asymmetric-oriented synthetic design and D-amino-acid incorporation. The D configuration at the amino acid center provides a controlled stereochemical element that can be carried through to peptide analogs, where stereochemistry influences conformational preferences and molecular recognition. The protected phenol and allyl ester combination supports stepwise protection/deprotection planning, enabling orthogonal functional group management from intermediate preparation to final scaffold assembly. The compound can be applied to generate chiral tyrosine derivatives for SAR studies, fragment-based molecular design campaigns, and stereoselective peptide analog construction where D-tyrosine placement is a specific design variable.

4. Bioconjugation Chemistry

H-D-Tyr(tBu)-allyl ester · HCl can be used in bioconjugation workflows that require a protected tyrosine residue as a controllable aromatic handle. The allyl ester form can be transformed into carboxylate-reactive derivatives for coupling to amine-containing biomolecules or for preparing activated intermediates that maintain the protected phenol during conjugation setup. The tert-butyl-protected phenolic group helps regulate phenol oxidation and nonspecific side reactions during preparation of conjugation reagents. Deprotection after conjugation planning can then reveal the tyrosine phenol for targeted labeling chemistry, enabling construction of tyrosine-bearing conjugates used in chemical biology research and biomolecule modification.

5. Pharmaceutical Intermediate Preparation

H-D-Tyr(tBu)-allyl ester · HCl aligns with industrial fine chemical synthesis needs for protected D-tyrosine intermediates used in the manufacture of peptide-like or peptidomimetic active ingredient candidates. The protected phenol (tert-butyl ether) and the allyl ester provide a manageable protection scheme that can be incorporated into process sequences for downstream activation, coupling, and controlled deprotection. The hydrochloride salt form supports consistent handling of the amine functionality during intermediate isolation and can facilitate reproducible feed preparation in synthetic manufacturing contexts. The compound's structure supports downstream conversion into activated carboxylic acid forms and tyrosine-containing fragments used for iterative library synthesis, process chemistry intermediate preparation, and specialty chemical production where stereodefined amino acid derivatives are required.

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