Divergent heparin oligosaccharide synthesis with preinstalled sulfate esters

Area of Science:

• Carbohydrate Chemistry
• Organic Synthesis
• Glycobiology

Background:

• Traditional heparin oligosaccharide synthesis involves backbone assembly followed by sulfation.
• This stepwise approach can be inefficient and limits structural diversity.
• A need exists for more streamlined and flexible synthetic strategies.

Purpose of the Study:

• To develop an alternative strategy for heparin oligosaccharide synthesis.
• To introduce O-sulfate groups onto glycosyl building blocks prior to oligosaccharide assembly.
• To enable divergent synthesis of sulfated and non-sulfated heparin oligosaccharides.

Main Methods:

• Development of a method to introduce O-sulfate groups as trichloroethyl esters onto glycosyl building blocks.
• Utilizing these modified building blocks in glycosylation reactions for oligosaccharide assembly.
• Assessing the stability of O-sulfate esters during synthetic manipulations and glycosylation.

Main Results:

• Successfully introduced pre-installed O-sulfate esters onto glycosyl building blocks.
• Demonstrated the stability of these O-sulfate esters during glycosylation and other synthetic steps.
• Achieved efficient glycosylation yields with both sulfated and non-sulfated building blocks.
• Enabled the assembly of multiple heparin oligosaccharides featuring pre-installed 6-O-sulfates.

Conclusions:

• The pre-installation of O-sulfate esters onto glycosyl building blocks is a viable and efficient strategy for heparin oligosaccharide synthesis.
• This method allows for divergent synthesis, producing both sulfated and non-sulfated compounds from common intermediates.
• The developed approach simplifies the synthesis of complex heparin structures with specific sulfation patterns.