Abstract
Starting from glyceraldehyde, structurally and stereochemically diverse dihydrofurans and dihydropyrans with a 1,2-dihydroxyethylene side chain can be accessed in few steps via allyl metal addition, O-allylation and ring-closing metathesis (RCM) or tandem RCM-isomerization, respectively. The synthesis of dihydrofurans requires a selective double-bond isomerization on the homoallylic alcohol stage, prior to O-allylation and RCM or RCM-isomerization.
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