Abstract:
The synthesis of 2,5-anhydro-D-mannose dithioacetal as well as the lengthening of the polihydroxylic chain of
the anhydro sugar to prepare 3,6-D-glycero-D-talo and D-glycero-D-galacto heptose derivatives, are described.
Condensation of these anhydro-heptose with ethylacetoacetate, yield
2-a-D-arabinofuranosyl-4ethoxycarbonyl-5-methylfurano.