Regenerative Glycosylation

J Org Chem. 2018 Jan 5;83(1):374-381. doi: 10.1021/acs.joc.7b02768. Epub 2017 Dec 22.

Abstract

Previously, we communicated 3,3-difluoroxindole (HOFox)-mediated glycosylations wherein 3,3-difluoro-3H-indol-2-yl (OFox) imidates were found to be key intermediates. Both the in situ synthesis from the corresponding glycosyl bromides and activation of the OFox imidates could be conducted in a regenerative fashion. Herein, we extend this study to the synthesis of various glycosidic linkages using different sugar series. The main outcome of this study relates to enhanced yields and/or reduced reaction times of glycosylations. The effect of HOFox-mediated reactions is particularly pronounced in case of unreactive glycosyl donors and/or glycosyl acceptors. A multistep regenerative synthesis of oligosaccharides is also reported.

Publication types

  • Research Support, N.I.H., Extramural

MeSH terms

  • Carbohydrate Conformation
  • Glycosylation
  • Oligosaccharides / chemical synthesis*
  • Oligosaccharides / chemistry
  • Sugars / chemical synthesis*
  • Sugars / chemistry

Substances

  • Oligosaccharides
  • Sugars