Developing an asymmetric, stereodivergent route to selected 6-deoxy-6-fluoro-hexoses

Org Biomol Chem. 2009 Mar 7;7(5):996-1008. doi: 10.1039/b815342f. Epub 2009 Jan 23.

Abstract

Free radical bromination and nucleophilic fluorination allows the conversion of methyl sorbate into the 6-fluoro analogue which undergoes sequential asymmetric dihydroxylation reactions. A range of 6-deoxy-6-fluorosugars were prepared by using different combinations of ligands. While the enantiomeric excesses obtained were comparable to those from other 6-substituted sorbates, the regioselectivity of dihydroxylation was moderate, with both 2,3- and 4,5-diols being obtained. A successful temporary persilylation strategy was evolved to convert the products of dihydroxylation rapidly to the fluorosugars 6-deoxy-6-fluoro-L-idose, 6-fluoro-L-fucose and 6-deoxy-6-fluoro-D-galactose, which were obtained in overall yields of 4%, 6% and 8% from methyl 6-fluoro-hexa-2E,4E-dienoate .

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Fucose / analogs & derivatives*
  • Fucose / chemical synthesis
  • Hexoses / chemical synthesis*
  • Hydroxylation

Substances

  • Hexoses
  • idose
  • Fucose
  • 6-deoxy-6-fluorogalactose