H-D-Ser-OBzl

H-D-Ser-OBzl is the D-enantiomer of serine protected as a benzyl ester, featuring a chiral α-carbon with a side-chain hydroxymethyl group and an O-benzyl (OBzl) group that masks the carboxyl functionality while leaving the side-chain alcohol available for selective chemistry. The D stereochemistry supports stereochemically defined peptide and peptidomimetic construction where incorporation of non-L amino acids is required for conformational control and protease resistance. The benzyl ester can participate in standard amino acid derivative workflows, including ester-compatible coupling strategies and subsequent hydrogenolysis-based deprotection to regenerate the free carboxyl group when needed. The combination of a protected carboxyl and an unprotected side-chain hydroxyl enables targeted functional group transformations, such as side-chain protection, activation for esterification, or conversion into ether, carbonate, or other oxygen-linked motifs.

1. Peptide Synthesis

H-D-Ser-OBzl is applied as a D-serine peptide building block in peptide synthesis workflows where stereodefined incorporation of D-amino acids is required. The amino acid framework with a benzyl-protected carboxyl supports coupling chemistry after appropriate activation, while the side-chain hydroxyl can be orthogonally protected or derivatized to prevent side reactions during chain assembly. The benzyl ester protecting group is compatible with common peptide synthesis sequences and can be removed under hydrogenolysis conditions to enable downstream C-terminal formation or further functionalization. D-Ser residues introduced from H-D-Ser-OBzl can be used to generate peptide analogs for studying backbone effects, cyclization strategies, or proteolytic stability in synthetic peptide libraries.

2. Side-Chain Functionalization

H-D-Ser-OBzl supports amino acid derivatization and side-chain functionalization programs that exploit the serine hydroxymethyl group for oxygen-based chemistry. The benzyl ester masks the carboxyl, allowing selective reactions at the side-chain alcohol to form ethers, esters, or carbonate-linked handles without immediate interference from carboxyl reactivity. The resulting functionalized D-serine derivatives can be carried forward into peptide coupling, used to generate conformationally constrained peptidomimetics, or serve as intermediates for attaching affinity tags and chemical reporters. Oxygen-functional D-serine scaffolds derived from H-D-Ser-OBzl also align with synthetic routes that require controlled stereochemistry at the α-center for structure-function studies.

3. Bioconjugation Chemistry

H-D-Ser-OBzl can be utilized in chemical biology and bioconjugation chemistry as a stereodefined amino acid intermediate for constructing conjugation-ready linkers and biomolecule-modifying reagents. The side-chain hydroxyl enables formation of activated ester or ether-type conjugation handles after conversion to appropriate leaving-group derivatives, while the benzyl ester can be carried through synthesis steps to maintain controlled chemoselectivity. Deprotection to the free carboxyl group can then support amide bond formation with amine-bearing biomolecules or linkers, enabling incorporation of D-serine motifs into labeled peptides and protein-reactive constructs. Stereochemical fidelity provided by the D configuration can be relevant when probing binding specificity, linker rigidity, or enzymatic processing of conjugates.

4. Peptidomimetics And SAR

H-D-Ser-OBzl is suited for peptidomimetic construction and structure-activity relationship (SAR) studies where non-L serine stereochemistry and oxygen functionality influence molecular recognition. The protected carboxyl and available side-chain hydroxyl allow iterative modification toward constrained analogs, including etherification, esterification, or conversion into heteroatom-containing motifs that mimic phosphorylation-like or hydrogen-bonding patterns. Benzyl ester removal can generate a carboxyl terminus for further coupling to scaffolds or for generating analog series with consistent terminal functionality. D-serine-derived analogs prepared from H-D-Ser-OBzl can therefore serve as stereochemically defined building blocks for SAR mapping of peptide-like ligands and enzyme-interaction models.

5. Process Chemistry Intermediate

H-D-Ser-OBzl functions as a practical chiral amino acid intermediate for fine chemical synthesis and process chemistry routes that require controlled protection of the carboxyl group. The benzyl ester protecting group provides a stable handle during intermediate manufacturing steps, while the unprotected serine side-chain hydroxyl supports planned downstream transformations under chemoselective conditions. Hydrogenolysis-compatible deprotection enables conversion to the corresponding free carboxylic acid derivative when integrating into larger synthetic sequences, including protected amino acid synthesis and peptide building block preparation. The defined D stereochemistry supports reproducible intermediate quality for industrial-scale production of stereochemically consistent peptide analogs, peptidomimetics, and oxygen-functional amino acid derivatives.

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