Abstract
An atom-economical oxovanadate-catalysed cycloisomerization of hydroxy enynes for the synthesis of bicyclo[4.3.0]non-1(9)-en-2-ones is disclosed, which can be rationalised through a cascade reaction of a dissociative Meyer-Schuster rearrangement to allenyl vanadates, followed by a thermal intramolecular Diels-Alder (IMDA) reaction and hydrolytic regeneration of the catalyst.
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