CAS: 118358-72-8—Precision synthetic building blocks in glycopeptide drug development

In an era of booming glycoscience and glycopeptide drugs, the precise construction of complex sugar structures is a core challenge leading to innovative therapies. Among them, glycosylated amino acid monomers with clear structures and excellent reaction characteristics have become an indispensable bridge between chemical synthesis and biological function research. L-Serine,N-[(9H-fluoren-9-ylmethoxy)carbonyl]-O-(2,3,4-tri-O-acetyl-6-deoxy-β-L-galactopyranosyl)-is exactly such a key advanced intermediate designed for efficient and precise synthesis.

Chemical Information

Chemical name: L-serine, N-[(9H-fluoren-9-ylmethoxy)carbonyl]-O-(2,3,4-tri-O-acetyl-6-deoxy-β-L-galactopyranosyl)-

Molecular formula: C₃₀H₃₃NO₁₂

Molecular weight: 599.58 g/mol

CAS number: 118358-72-8

Category: Glycopeptides synthesis building blocks

Structural features and design essence

The structure of this molecule exquisitely integrates three key functional parts, demonstrating its excellent applicability in solid-phase peptide synthesis (SPPS):

Fmoc protecting group: The 9-fluorenylmethoxycarbonyl (Fmoc) group introduced at the N-terminus is the most classic and common amino protecting group in solid-phase peptide synthesis. It can be efficiently and selectively removed under mild alkaline conditions (such as piperidine), and is perfectly compatible with the peptide chain elongation process, ensuring the directionality and efficiency of synthesis.

Selectively protected glycosyl unit: The serine side chain hydroxyl group is connected to a specifically modified L-galactose derivative through a glycosidic bond. The sugar unit is in the 6-deoxy form and is protected by acetyl groups at positions 2, 3, and 4 other than the primary hydroxyl group. This design is crucial: the acetyl group provides stable temporary protection that can be selectively removed after the peptide chain is assembled without affecting the peptide bonds and various other functional groups through mild alkali treatment, thereby exposing the free hydroxyl groups on the sugar ring for subsequent further sugar chain extension or modification.

Serine Linker: Serine is one of the common O-glycosylation sites in proteins. Using it as the core monomer can accurately simulate the important O-linked glycoform structure in natural glycoproteins, laying the foundation for the preparation of structurally uniform glycopeptides or glycoprotein mimics.

Main applications and value

The core monomer of glycopeptide solid-phase synthesis: As a ready-to-use glycosylated amino acid that is highly compatible with the Fmoc strategy, it can be directly put into the peptide synthesizer. Researchers can precisely introduce it into specific positions of the peptide chain, greatly simplifying the linear assembly process of complex glycopeptides, avoiding cumbersome late-stage glycosylation steps, and improving the synthesis success rate and product uniformity.

Development of glycoprotein mimetics and drug conjugates: Glycopeptides synthesized based on this monomer can be used to study the effects of specific glycosylation patterns on protein stability, immunogenicity, biological activity and targeting. It is an important starting point for constructing site-directed glycoengineered fragments in therapeutic glycoprotein analogs, vaccine antigens, or antibody-drug conjugates (ADCs).

Tools for studying sugar-protein interactions: Glycopeptides with well-defined structures are ideal probes or inhibitor precursors for exploring lectins, antibodies, and other protein receptors that recognize sugar structures, helping to reveal the molecular mechanisms of life processes such as cell recognition, signal transduction, and pathogen infection.

Building blocks for the synthesis of complex sugar chains: The hydroxyl groups exposed after removing the acetyl group provide clear chemical reaction sites for further extending the sugar chain through glycosidation reactions and constructing more complex oligosaccharide structures, making it a high-quality front-end module for the stepwise synthesis of multivalent or branched sugar chains.

Conclusion

L-Serine, N-Fmoc-O-(2,3,4-tri-O-acetyl-6-deoxy-β-L-galactopyranosyl)- is not only a chemical reagent, but also a sophisticated "molecular building block" in the toolbox of medicinal chemists and synthetic biologists. It represents a critical step in converting complex glycobiological information into chemical entities that can be precisely synthesized. From basic research on life interactions to the rational design and preparation of innovative glycopeptide and glycoprotein therapeutic drugs, this compound plays a core role in laying the foundation and opening pathways.

The above information is provided by the editor of KASONS and is for scientific research only.