Abstract
Abstract3,5‐Dihydroxy‐2‐methyl‐5,6‐dihydropyran‐4‐one was prepared in reasonable yield from D‐glucose and piperidine salts. Of the possible mechanisms, experimental evidence favours that involving conversion of the resulting aldosylamine into the enol of the corresponding aminodeoxyketose (Amadori rearrangement), followed by 1,4‐elimination of amine from this enol and subsequent acid‐catalysed cyclization.
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