Thioglycoside Synthesis in Medicinal Chemistry

Thioglycosides are carbohydrate derivatives in which the anomeric oxygen atom is replaced by sulfur, conferring enhanced resistance to enzymatic hydrolysis and distinct electronic properties. In medicinal chemistry they serve as glycomimetics and glycosidase inhibitors, and as building blocks for drug conjugates and vaccine adjuvants. Synthetic approaches have evolved from classic nucleophilic substitution of activated sugar halides with thiolate salts to modern catalytic strategies employing transition-metal complexes or organocatalysts. Control of anomeric stereochemistry remains central, with neighbouring-group participation and chiral auxiliaries routinely exploited to achieve high α/β selectivity. Enzymatic and solid-phase methods have also been developed for automated assembly of oligosaccharide mimics. Recent advances focus on mild reaction conditions, broadening substrate scope to include unprotected sugars, and integrating thioglycosides into multifunctional scaffolds for targeted delivery and receptor modulation. The global importance of these compounds spans antiviral and anticancer research, antimicrobial development and immunotherapy, reflecting a growing interest in sulphur-linked glycobiology.

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Technical terms

Thioglycoside: A glycoside in which the glycosidic oxygen is replaced by a sulfur atom, yielding products with increased hydrolytic stability and altered binding interactions.

Glycosyl donor: A sugar derivative activated (for example, as a halide or trichloroacetimidate) to transfer its saccharide moiety to a nucleophile during glycosylation.

S-alkylation: A reaction that introduces an alkyl group onto a thiolate, forming a new carbon–sulfur bond at the anomeric centre.

Glycomimetic: A non-natural compound designed to mimic carbohydrate structures, often featuring modifications (such as sulphur linkages) to enhance stability and binding specificity.

Catalytic thioglycosylation: A process that employs catalysts—commonly transition‐metal complexes or organocatalysts—to facilitate the formation of thioglycosidic bonds under milder conditions with improved stereocontrol.

References

1. Synthesis, Molecular Docking and Preliminary in-Vitro Cytotoxic Evaluation of Some Substituted Tetrahydro-naphthalene (2',3',4',6'-Tetra-O-Acetyl-β-D-Gluco/-Galactopyranosyl) Derivatives. Molecules (2012).
2. Synthesis of Cyclic and Acyclic Pyrimidine Nucleosides Analogues with Anticipated Antiviral Activity. Acta Chimica Slovenica (2018).