Boc-Tyr(Ac)-OH

Boc-Tyr(Ac)-OH is a protected tyrosine derivative in which the α-amino group is carbamated with a Boc protecting group and the phenolic side chain is acetylated, yielding a chiral amino acid framework with a free carboxylic acid suitable for peptide coupling. The molecule contains three key reactive elements for synthesis planning: a Boc-protected amine that can be removed under acidolysis, a carboxylic acid for amide bond formation, and an O-acetylated phenol that can be selectively deprotected or transformed for side-chain functionalization. The acetylated tyrosine phenol modulates hydrogen-bonding and can improve compatibility with coupling conditions by reducing phenolic nucleophilicity. As a protected amino acid building block, Boc-Tyr(Ac)-OH functions as a stereochemically defined intermediate for preparing Tyr-containing peptides and for downstream conversion to free tyrosine or tyrosine-derived motifs used in biochemical research and fine chemical synthesis.

1. Peptide Synthesis

Boc-Tyr(Ac)-OH supports peptide building block preparation in solid-phase or solution-phase peptide synthesis by providing a Boc-protected nitrogen and a carboxylic acid for controlled amide bond formation at the α-position. The O-acetylated tyrosine side chain reduces unprotected phenol reactivity during coupling and can help minimize side reactions such as phenolic acylation or undesired cross-linking. Boc removal enables subsequent coupling steps while the acetyl group can be retained through early assembly, then deprotected at a later stage to furnish a defined Tyr phenol for post-assembly modifications. Tyr-containing peptide analogs prepared from this protected intermediate can be used to probe sequence-dependent behavior, generate peptide standards, and construct peptidomimetic scaffolds with controlled side-chain functionality.

2. Side-Chain Functionalization

Boc-Tyr(Ac)-OH is suitable for side-chain functionalization workflows that require a masked phenolic handle, since the acetylated tyrosine oxygen can be deprotected to regenerate the phenol for targeted derivatization. The protected phenol enables chemoselective manipulation of the amino acid while the Boc group maintains amine protection during intermediate formation and purification. Phenolic reactivation supports downstream transformations relevant to biochemical labeling and molecular recognition studies, including formation of phenoxy derivatives, conjugation-ready intermediates, and controlled incorporation of tyrosine-derived motifs into larger structures. This strategy aligns with amino acid derivatization approaches where orthogonal protection allows sequential functional group installation without disrupting the peptide coupling-ready backbone.

3. Protected Amino Acids

Boc-Tyr(Ac)-OH functions as a chiral, orthogonally protected amino acid intermediate for protected amino acid synthesis and N-protected amino acid chemistry, combining Boc protection at the α-amine with O-acetyl protection at the tyrosine side chain. The presence of a free carboxylic acid supports conversion to activated esters or direct coupling partners under standard peptide coupling conditions, while the Boc group provides a predictable deprotection handle for iterative chain assembly. The acetylated phenol acts as a temporary protecting group that can be removed or exchanged depending on the desired downstream functional group state. Use of this protected tyrosine derivative can streamline the preparation of Tyr-bearing intermediates for SAR studies, structure-defined peptide analog libraries, and synthetic organic chemistry routes requiring controlled orthogonality.

4. Chemical Biology Labeling

Boc-Tyr(Ac)-OH can be applied to chemical biology workflows that require tyrosine phenol incorporation into labeled peptides, probes, or affinity reagents, where side-chain masking improves handling during synthesis. The protected phenolic oxygen helps maintain chemoselectivity during coupling and intermediate purification, while later deprotection can enable attachment of tags or reactive groups at the Tyr position. The defined stereochemistry at the α-carbon supports consistent incorporation into peptide-like structures used for molecular recognition and binding assays. Downstream derivatives derived from Boc-Tyr(Ac)-OH can serve as building blocks for biomolecule modification and analytical standards that track tyrosine-dependent recognition features in complex chemical systems.

5. Pharmaceutical Intermediate Preparation

Boc-Tyr(Ac)-OH is relevant to pharmaceutical intermediate preparation and process chemistry intermediate design for manufacturing routes that require protected tyrosine derivatives with predictable deprotection behavior. The Boc-protected amine and O-acetylated phenol provide orthogonality that can be leveraged to manage functional group compatibility across multi-step synthesis, including peptide fragment assembly and late-stage side-chain unveiling. The free carboxylic acid group enables conversion into coupling-ready forms for constructing defined amide linkages in peptide-like active ingredient candidates or related intermediates. Industrial synthesis planning can employ this compound as a controlled chiral building block to support reproducible downstream generation of Tyr-functionalized fragments used in fine chemical production and specialty chemical manufacturing.

1. Proinsulin C-peptide and insulin: Limited pattern similarities of interest in inter-peptide interactions but no C-peptide effect on insulin and IGF-1 receptor signaling

2. Autoinhibition and phosphorylation-induced activation of phospholipase C-γ isozymes

3. Immune responses to peptides containing homocitrulline or citrulline in the DR4-transgenic mouse model of rheumatoid arthritis

4. Exosomes-mediated Transfer of miR-125a/b in Cell-to-cell Communication: A Novel Mechanism of Genetic Exchange in the Intestinal Microenvironment

5. Constitutive and inflammation-dependent antimicrobial peptides produced by epithelium are differentially processed and inactivated by the commensal Finegoldia magna and the pathogen Streptococcus pyogenes