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Solution- and solid-phase oligosaccharide synthesis using glucosyl iodides: a comparative study.

Son N Lam1, Jacquelyn Gervay-Hague

  • 1University of California, Davis, Department of Chemistry, Davis, CA 95616, USA.

Carbohydrate Research
|November 16, 2002
PubMed
Summary
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Solution-phase synthesis using glycosyl iodide donors offers a highly efficient method for creating alpha-(1 --> 6)-linked glucosyl oligomers. This approach requires less donor material and reaction time compared to solid-phase methods, simplifying purification.

Area of Science:

  • Carbohydrate Chemistry
  • Organic Synthesis
  • Glycochemistry

Background:

  • Glycosyl iodide donors are effective reagents for synthesizing alpha-(1 --> 6)-linked glucosyl oligomers.
  • Both solid-phase and solution-phase strategies have been employed for this synthesis.

Purpose of the Study:

  • To compare the efficiency of solid-phase versus solution-phase synthesis of alpha-(1 --> 6)-linked glucosyl oligomers using glycosyl iodide donors.
  • To demonstrate the advantages of solution-phase synthesis through the construction of a complex hexasaccharide.

Main Methods:

  • Utilized glycosyl iodide donors for both solid-phase and solution-phase synthesis of oligosaccharides.
  • Optimized reaction conditions for solution-phase glycosylation, focusing on donor equivalents and reaction time.

Related Experiment Videos

  • Employed convergent synthesis strategies (2+2 and 2+4) for building a hexasaccharide.

    • Main Results:

    • Solution-phase synthesis required significantly less donor (2.5 equiv) and time (2-3 h) per glycosylation compared to solid-phase methods (7.5 equiv, ~12 h).
    • Glycosylation reactions in solution-phase proceeded with high yields (>90%), facilitating purification via column chromatography.
    • Successfully synthesized a complex hexasaccharide using a convergent solution-phase approach.

    Conclusions:

    • Solution-phase synthesis using glycosyl iodide donors is a more efficient and practical method for producing alpha-(1 --> 6)-linked glucosyl oligomers.
    • The high efficiency and facile purification make solution-phase synthesis advantageous for complex oligosaccharide construction.