Abstract
The mercury sulphate catalysed acidic opening of the dihydropyran ring in hexa-O-acetyl-D-gentiobial 2, resulting in (2E,4S,5R)-4-acetoxy-5-hydroxy-6-(2,3,4,6-tetra-O-acetyl-β-D-glucopyranosyloxy)hex-2-enal 3 was employed as the key transformation in the synthesis of O-glycosides, which are precursors of glycosphingolipids.
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