H-Ser(Bzl)-OBzl · p-tosylate

H-Ser(Bzl)-OBzl · p-tosylate is a benzyl-protected serine derivative presented as the p-tosylate salt, featuring an α-amino group masked as H-Ser(Bzl) with a benzyl ester at the carboxylate (OBzl) and a benzyl protecting group on the side-chain hydroxyl (Bzl). The stereogenic α-carbon of serine is retained, providing a chiral amino acid framework compatible with stereocontrolled peptide coupling chemistries. The p-toluenesulfonate counterion can stabilize the amino functionality during handling and downstream transformations, while the benzyl-based protecting groups establish orthogonal behavior under hydrogenolysis conditions. The resulting reactivity profile supports conversion to peptide building blocks and downstream functionalized serine derivatives through selective deprotection and acylation strategies.

1. Peptide Synthesis

H-Ser(Bzl)-OBzl · p-tosylate is used in peptide synthesis workflows where a protected serine residue is required for amide bond formation and controlled side-chain chemistry. The protected hydroxyl (Bzl) and protected carboxyl (OBzl) minimize side reactions during coupling, while the free amino functionality supports standard peptide coupling to generate protected oligopeptides and longer peptide chains. Benzyl ester and benzyl ether protections can be removed under hydrogenolysis to reveal the native serine side-chain alcohol for subsequent phosphorylation, glycosylation, or further derivatization. Downstream peptide analog construction benefits from the chiral serine backbone, enabling incorporation into sequence-defined scaffolds for structure-activity relationship studies and synthetic peptide libraries.

2. Side-Chain Functionalization

H-Ser(Bzl)-OBzl · p-tosylate is applicable to side-chain functionalization strategies that require conversion of serine into chemically differentiated motifs without disturbing the peptide-compatible stereocenter. The benzyl-protected side-chain hydroxyl enables controlled deprotection to generate a primary alcohol handle after assembly of an intermediate or peptide fragment. The benzyl ester (OBzl) and benzyl ether (Bzl) protecting groups can be leveraged to stage functional group unveiling, supporting sequential derivatization such as conversion to activated serine derivatives, ester formation, or installation of substituents used in peptidomimetic design. Industrial and research settings can use the staged protection pattern to prepare serine-containing intermediates that feed into downstream fine chemical synthesis and scaffold diversification.

3. Protected Amino Acid Chemistry

H-Ser(Bzl)-OBzl · p-tosylate serves as a protected amino acid intermediate for N-/C-terminal strategy design in synthetic organic chemistry and peptide building block preparation. The combination of benzyl protections on both the side-chain hydroxyl and the carboxylate, together with p-tosylate salt formation, provides a practical platform for managing amino group reactivity during protection, coupling, and purification steps. The chiral α-amino acid framework can be converted into activated derivatives for peptide coupling or transformed into alternative protected serine forms by selective deprotection and re-protection cycles. Downstream utility includes preparation of stereodefined serine-containing fragments used in iterative synthesis, process chemistry intermediate development, and manufacturing route planning for protected amino acid derivatives.

4. Bioconjugation Chemistry

H-Ser(Bzl)-OBzl · p-tosylate is suitable for bioconjugation-oriented chemical biology workflows that require serine-derived linkers or handles compatible with controlled functional group exposure. The benzyl-protected serine alcohol can be unmasked after assembly to provide a hydroxyl-bearing site for subsequent coupling chemistries, including attachment of linkers, tags, or solubilizing groups through hydroxyl-reactive transformations. The p-tosylate counterion can support reproducible salt formation and handling when preparing conjugation-ready intermediates from amino acid building blocks. Resulting conjugation precursors can be incorporated into peptide-based probes, affinity reagents, or labeled biomolecule constructs where stereodefined amino acid geometry influences molecular recognition and downstream analytical behavior.

5. Pharmaceutical Intermediate Preparation

H-Ser(Bzl)-OBzl · p-tosylate can be employed in pharmaceutical intermediate preparation for manufacturing of protected serine residues and peptide-related intermediates used in process chemistry. The benzyl-protected functional groups reduce undesired side reactions during scalable synthesis of protected peptide fragments, while the chiral serine core supports consistent stereochemical outcomes across batch production. The ability to stage deprotection from benzyl groups enables downstream conversion to free serine functionalities needed for further synthetic steps, such as incorporation into larger peptide-like structures or formation of intermediate motifs for medicinal chemistry. Industrial chemical production can apply this compound as a chiral amino acid intermediate feeding into specialty chemical synthesis and controlled construction of protected scaffolds for downstream development programs.

1. P-selectin and Complement’s Role in a Neonatal Model of Germinal Matrix Hemorrhage-Induced Secondary Injury

2. Novel Peptide-Based PD1 Immunomodulators Demonstrate Efficacy in Infectious Disease Vaccines and Therapeutics

3. Immune responses to homocitrulline-and citrulline-containing peptides in rheumatoid arthritis

4. GLP-1, exendin-4 and C-peptide regulate pancreatic islet microcirculation, insulin secretion and glucose tolerance in rats

5. Myotropic activity and immunolocalization of selected neuropeptides of the burying beetle Nicrophorus vespilloides (Coleoptera: Silphidae)