Boc-Ser(Bzl)-ONp

Boc-Ser(Bzl)-ONp is a protected serine derivative featuring an N-Boc carbamate on the amino group, a benzyl-protected side-chain hydroxyl (Ser(Bzl)), and a p-nitrophenyl ester (ONp) at the carboxylate. The molecule is chiral at the serine α-carbon and is typically handled as a stereodefined amino acid intermediate for peptide coupling chemistry. The Boc group provides acid-labile N-protection, while the benzyl ether withstands many coupling and base conditions and can be removed by hydrogenolysis when side-chain deprotection is required. The ONp ester activates the carboxylate toward nucleophilic acyl substitution, enabling efficient formation of amide bonds under controlled conditions and supporting downstream conversion into peptide building blocks and functionalized intermediates.

1. Peptide Coupling Chemistry

Boc-Ser(Bzl)-ONp is used in peptide synthesis planning where an activated carboxylate is required for amide bond formation at the serine position. The p-nitrophenyl ester (ONp) functions as an acylating handle, while the Boc-protected amine and benzyl-protected side-chain hydroxyl preserve orthogonality during coupling steps. The stereodefined serine core supports incorporation into peptide chains with defined configuration, and the protected hydroxyl can later be unmasked to enable serine-specific chemistry such as phosphorylation mimetics or side-chain functionalization. The resulting amide-linked intermediates can be carried forward into longer protected peptide sequences and then globally deprotected to produce target peptide analogs.

2. Protected Amino Acid Synthesis

Boc-Ser(Bzl)-ONp serves as a chiral, protected amino acid building block for manufacturing and research-grade preparation of serine-containing fragments. The Boc carbamate strategy provides an acid-labile N-protection element compatible with common peptide assembly workflows, while the benzyl ether on the side-chain hydroxyl supports selective deprotection timing. The ONp ester form can be treated as a controllable activated derivative that participates in acyl transfer chemistry to generate peptide-ready intermediates without exposing the free carboxylic acid. Downstream processing can convert the coupled products into protected peptide segments, enabling consistent stereochemical retention and protecting-group choreography across synthetic campaigns.

3. Peptidomimetic And SAR Studies

Boc-Ser(Bzl)-ONp is applicable in peptidomimetic construction where serine side-chain chemistry must be introduced with controlled protection and later derivatization. The benzyl-protected hydroxyl enables storage of the serine functional handle through coupling and fragment assembly, while deprotection can unlock the alcohol for subsequent transformations such as etherification, esterification, or conversion to phosphorylation-mimicking motifs. The activated ONp ester supports rapid incorporation of the serine residue into analog scaffolds used for structure-activity relationship studies. The stereodefined amino acid framework supports generation of defined stereochemical variants that can be compared as discrete chemical entities during SAR-driven library synthesis.

4. Chemical Biology Labeling

Boc-Ser(Bzl)-ONp can be employed in chemical biology workflows that require serine-containing linkers or peptide conjugation precursors with orthogonal protecting groups. The protected hydroxyl (benzyl ether) helps prevent uncontrolled side reactions during coupling to targeting scaffolds, while the Boc group can be removed to expose the amine for subsequent functionalization or conjugation steps. The ONp ester form provides a reactive carboxylate equivalent that can be incorporated into amide-linked conjugates, including peptide-based tags and bioconjugation handles. The protected serine unit enables downstream generation of alcohol-functional conjugates for attachment of probes, affinity moieties, or biomolecule-compatible linkers through controlled deprotection and derivatization.

5. Process Chemistry Intermediate

Boc-Ser(Bzl)-ONp is suitable for process chemistry intermediate preparation where activated amino acid derivatives are used to streamline peptide fragment manufacture. The combination of Boc N-protection and benzyl side-chain protection supports robust handling across coupling, purification, and intermediate isolation steps, while the ONp ester provides a defined reactivity profile for acylation chemistry. The stereochemical integrity of the serine α-center can be maintained through protected-state processing, supporting consistent quality for downstream fragment assembly. The compound can be used to produce protected serine-containing intermediates that feed into fine chemical synthesis routes for peptide building blocks and related specialty chemical production.

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