Recent advances in β-l-rhamnosylation

Area of Science:

• Carbohydrate Chemistry
• Organic Synthesis
• Glycoscience

Background:

• L-Rhamnose is a crucial monosaccharide in pathogen-associated antigenic oligosaccharides and polysaccharides.
• Achieving 1,2-cis stereoselectivity in l-rhamnoside glycosylation is difficult due to steric and electronic factors, and lack of neighboring group participation.
• Despite challenges, various synthetic strategies have been developed to achieve beta-stereoselectivity in l-rhamnosylation.

Purpose of the Study:

• To review recent advancements in beta-l-rhamnosylation methodologies.
• To highlight the application of these methods in the total synthesis of biologically significant beta-l-rhamnose-containing oligosaccharides.

Main Methods:

• Exploration of diverse synthetic pathways for glycosylation of l-rhamnose derivatives.
• Application of developed methodologies in complex oligosaccharide synthesis.
• Analysis of stereochemical outcomes, focusing on achieving beta-selectivity.

Main Results:

• Successful development of various strategies to overcome stereochemical challenges in beta-l-rhamnosylation.
• Demonstration of the utility of these methods in constructing complex carbohydrate structures.
• Expansion of synthetic accessibility to important beta-l-rhamnose containing natural products.

Conclusions:

• Significant progress has been made in achieving beta-stereoselectivity in l-rhamnosylation.
• These advancements facilitate the synthesis of biologically relevant oligosaccharides containing beta-l-rhamnose.
• The reviewed methodologies offer valuable tools for carbohydrate chemists and drug discovery efforts.