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Continuous-Flow Synthesis of Carbohydrate Building Blocks: d-Glucuronate Monosaccharide.

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Continuous-flow synthesis streamlines carbohydrate chemistry, enhancing reproducibility and scalability. This study developed a flow method for a key d-glucuronic acid building block, improving productivity and space-time yield.

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Area of Science:

  • Carbohydrate Chemistry
  • Glycoscience
  • Organic Synthesis

Background:

  • Advanced monosaccharide building blocks are crucial for synthesizing complex glycans.
  • Traditional batch synthesis methods can be challenging for reproducibility and scalability in carbohydrate chemistry.

Purpose of the Study:

  • To develop a predominantly continuous-flow synthesis of a d-glucuronic acid building block.
  • To improve the efficiency, reproducibility, and scalability of glycan synthesis.

Main Methods:

  • Utilized a series of optimized, modular transformations in a continuous-flow system.
  • Key reactions included O-p-methoxyphenyl (PMP) glycosylation, Zemplén deacylation, benzylidene protection/deprotection, benzoylation, and C6 oxidation/methylation.
  • Employed a biphasic TEMPO/BAIB oxidation protocol and automation software (MechWolf).

Main Results:

  • Achieved a predominantly continuous-flow synthesis of a d-glucuronic acid building block.
  • Demonstrated β-selective glycosylation at elevated temperatures and selective C6 oxidation to the uronic acid.
  • The seven-step continuous-flow process had a total residence time of 91.2 minutes, significantly enhancing productivity and space-time yield (STY) compared to batch methods.

Conclusions:

  • Continuous-flow chemistry offers a powerful approach to streamline glycan synthesis, improving productivity and scalability.
  • The developed method provides a direct route to a d-glucuronic acid building block applicable to glycosaminoglycan synthesis.
  • Automation via MechWolf software further enhances the reproducibility of flow chemistry methods in this field.