A novel entry to naturally occurring 5-alkenyl α,β-unsaturated δ-lactones from d-glucose: syntheses of (+)-acetylphomalactone and (+)-asperlin

Abstract
A bicyclic pyranosidic glycoside 6, readily obtained from D-glucose, has been used as the key intermediate in enantioselective syntheses of (+)-acetylphomalactone and (+)-asperlin, in which the configuration at C-5 corresponds to that of the hexopyranosides in the L-sugar series.

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