H-Tyr(Bzl)-OBzl · p-tosylate

H-Tyr(Bzl)-OBzl · p-tosylate is a protected tyrosine derivative in which the phenolic hydroxyl is benzylated (Tyr(Bzl)) and the carboxyl group is present as a benzyl ester (OBzl), while the overall material is associated with a p-toluenesulfonate counterion. The molecule therefore contains a stereochemically defined amino acid core with an N-terminal amine masked as an amino acid salt/derivative, and it bears multiple benzylic protecting groups that modulate nucleophilicity and control chemoselective peptide coupling. The benzyl ester and benzyl ether functionalities provide stability under many coupling conditions yet can be removed by hydrogenolysis or related deprotection strategies to reveal the free carboxylic acid and phenolic alcohol for downstream elaboration. The p-toluenesulfonate association enhances handling of the amine-containing intermediate and supports reproducible conversion into peptide-ready forms for synthetic organic chemistry and peptide science.

1. Peptide Synthesis

H-Tyr(Bzl)-OBzl · p-tosylate is used as a protected tyrosine peptide building block in automated and manual peptide coupling workflows where N-terminal amine availability and side-chain protection are required. The benzyl-protected phenol (Bzl) suppresses undesired O-acylation during amide bond formation, while the benzyl ester (OBzl) and salt form help maintain controlled reactivity of the carboxyl and amino functionalities during activation and coupling. The protected amino acid can be incorporated into peptide chains to generate tyrosine-containing sequences that tolerate standard coupling reagents and subsequent protecting-group manipulations. Downstream, hydrogenolysis can regenerate the free phenolic hydroxyl and carboxylic acid for further peptide elongation or for conversion into tyrosine-linked functional motifs.

2. Side-Chain Functionalization

H-Tyr(Bzl)-OBzl · p-tosylate supports side-chain derivatization strategies targeting the tyrosine phenolic group while maintaining orthogonal protection during intermediate synthesis. The benzyl ether on the phenol provides a stable handle for multi-step transformations, enabling selective deprotection at a chosen stage to generate a phenolic alcohol suitable for esterification, etherification, or electrophilic aromatic substitution chemistry. The benzyl ester on the carboxyl group can be retained through early steps and removed later to furnish a carboxylic acid for conjugation or for conversion into activated derivatives. This protection pattern enables controlled access to tyrosine-based motifs used in peptidomimetics, biochemical probes, and synthetic scaffolds where phenol reactivity must be timed relative to peptide assembly.

3. Protected Amino Acid Chemistry

H-Tyr(Bzl)-OBzl · p-tosylate is applied in protected amino acid synthesis and intermediate preparation where chemoselective protection of both the phenolic hydroxyl and the carboxyl group is required. The N-terminal amine salt/derivative behavior associated with p-toluenesulfonate can facilitate reproducible handling and conversion into coupling-ready forms, while the benzyl protecting groups provide orthogonality relative to acid- or base-labile protecting groups used elsewhere in a synthetic sequence. The compound's benzylated functionalities allow stepwise deprotection planning to match the protection scheme of other amino acid building blocks in mixed sequences. The resulting deprotected tyrosine derivatives can serve as downstream inputs for peptide coupling chemistry, fragment elaboration, and synthesis of tyrosine-functionalized intermediates used across fine chemical production.

4. Bioconjugation Chemistry

H-Tyr(Bzl)-OBzl · p-tosylate can be employed as a tyrosine-containing precursor for bioconjugation workflows that require controlled presentation of a phenolic handle and a protected carboxyl group during linker construction. The benzyl-protected phenol helps prevent premature side reactions during linker synthesis, while later deprotection can expose a phenolic oxygen for coupling chemistries that rely on phenol nucleophilicity or subsequent functional group installation. The benzyl ester can be converted downstream into a carboxylate-bearing intermediate suitable for amide formation or for activation-based conjugation strategies with biomolecule-reactive groups. Incorporation of this protected tyrosine unit into peptide-like linkers enables generation of conjugates used in chemical biology research, analytical standards, and biomolecule modification campaigns where tyrosine positioning and functional group timing are critical.

5. Pharmaceutical Manufacturing

H-Tyr(Bzl)-OBzl · p-tosylate is relevant to pharmaceutical manufacturing and process chemistry for the preparation of protected tyrosine intermediates used in peptide drug substance synthesis and related specialty chemical production. The compound's protected phenol and protected ester functionalities align with typical manufacturing needs for isolable intermediates that can withstand coupling steps and controlled deprotection sequences without uncontrolled side reactions. The p-toluenesulfonate association supports stable material handling for scale-up operations where consistent salt formation can influence downstream conversion efficiency and reproducibility of intermediate quality. Downstream, deprotected tyrosine-containing fragments derived from this material can feed into controlled peptide assembly, impurity-managed intermediate purification flows, and robust synthetic routes for manufacturing-grade amino acid derivatives.

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