2,3-Anhydrosugars in glycoside bond synthesis. Application to 2,6-dideoxypyranosides

J Org Chem. 2009 Mar 20;74(6):2278-89. doi: 10.1021/jo900131a.

Abstract

We describe here the first use of 2,3-anhydrosugars as glycosylating agents for the preparation of 2-deoxypyranosides. In particular, the methodology was used to assemble 2,6-dideoxysugar glycosides. Glycosylation of a panel of alcohols with one of two 6-deoxy-2,3-anhydrosugar thioglycosides (8 and 9) in the presence of a Lewis acid afforded 2,6-dideoxy-2-thiotolyl glycoside products in generally excellent yields with an exclusively syn relationship between the aglycon and the C-3 hydroxyl group. Removal of the 2-thiotolyl group can be achieved upon reaction with tri-n-butyltin hydride and AIBN to give the corresponding 2,6-dideoxy pyranosides. Once developed, the method was applied to the synthesis of oligosaccharide moieties in the natural products apoptolidin and olivomycin A.

MeSH terms

  • Biological Products / chemical synthesis
  • Glycosides
  • Glycosylation
  • Macrolides / chemical synthesis
  • Monosaccharides / chemical synthesis*
  • Oligosaccharides / chemical synthesis
  • Olivomycins / chemical synthesis

Substances

  • Biological Products
  • Glycosides
  • Macrolides
  • Monosaccharides
  • Oligosaccharides
  • olivomycin A
  • Olivomycins
  • apoptolidin