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Abstract
Improved conditions for the acetolysis of methyl 2,3,5-tri-O-benzyl-α-and β-L-arabinofuranosides and 2,3,5-tri-O-benzoyl-α-and β-L-ribofuranosides have been investigated. In the case of the arabinofuranosides, reproducible acetolysis conditions were obtained by substantially decreasing the amount of sulphuric acid with respect to acetic acid-acetic anhydride mixtures. With the ribofuranosides low temperature acetolysis for a short time resulted in good isolated yield of the β-1-O-acetyl anomer.