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Related Experiment Videos

Sequential cyclization-elimination route to carbohydrate-based oxepines.

Steve Castro1, Mark W Peczuh

  • 1Department of Chemistry, The University of Connecticut, 55 North Eagleville Road, U-3060, Storrs, CT 06269, USA.

The Journal of Organic Chemistry
|April 13, 2005
PubMed
Summary

A new five-step method synthesizes carbohydrate-based oxepines from hept-1-enitols. This approach offers an alternative to ring-closing metathesis for creating novel septanose carbohydrates.

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Area of Science:

  • Organic Chemistry
  • Carbohydrate Chemistry
  • Synthetic Chemistry

Background:

  • Carbohydrate-based oxepines are valuable intermediates in synthesizing complex carbohydrates.
  • Existing methods like ring-closing metathesis have limitations for certain carbohydrate structures.

Purpose of the Study:

  • To develop a novel, efficient five-step synthesis of carbohydrate-based oxepines.
  • To provide an alternative synthetic route to oxepines from readily available hept-1-enitols.
  • To explore the utility of the synthesized oxepines as glycosyl donors.

Main Methods:

  • Silyl protection and hydroboration/oxidation of hept-1-enitols.
  • Swern oxidation followed by acetal formation and cyclization.
  • Elimination reactions to yield carbohydrate-based oxepines.

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Main Results:

  • A five-step sequence successfully prepared carbohydrate-based oxepines from hept-1-enitols.
  • The synthesized oxepines can function as glycosyl donors for novel septanose carbohydrates.
  • A novel ring contraction yielding C-methylenealdehydo arabinofuranoside was observed during elimination reactions.

Conclusions:

  • The developed five-step method is a viable alternative to ring-closing metathesis for oxepine synthesis.
  • The new route expands the synthetic accessibility of carbohydrate-based oxepines.
  • The study highlights unique reactivity in acid-mediated elimination reactions of deoxyseptanosides.