Iridium catalysis: reductive conversion of glucan to xylan

Area of Science:

• Carbohydrate Chemistry
• Organometallic Catalysis

Background:

• Cellobioside and xylobioside are important disaccharides with distinct structural features.
• Developing efficient synthetic routes for modified carbohydrates is crucial for glycobiology research.

Purpose of the Study:

• To develop a new method for converting cellobioside derivatives to xylobioside derivatives.
• To demonstrate the utility of the synthesized xylobioside in further glycosylation reactions.

Main Methods:

• Iridium-catalyzed dehydrogenative decarbonylation reaction.
• Protection of hydroxyl groups using aromatic ester protecting groups.
• Glycosyl donor preparation and subsequent glycosylation.

Main Results:

• Successful conversion of a partly protected cellobioside to a fully protected xylobioside.
• Good yields achieved with two distinct aromatic ester protecting groups.
• The synthesized xylobioside effectively served as a glycosyl donor for xylooctaose synthesis.

Conclusions:

• Iridium-catalyzed dehydrogenative decarbonylation is an effective strategy for cellobioside to xylobioside transformation.
• The developed method provides access to valuable xylobioside intermediates for oligosaccharide synthesis.
• This approach facilitates the construction of complex carbohydrate structures.