Journal of Heterocyclic Chemistry p. 647 - 649 (1988)
Update date:2022-08-05
Topics:
Bravo
Frigerio
Ticozzi
Through an anti-Markovnikow hydration of some olefin derivatives of 4-hydroxy-2-pyrones, and 4-hydroxy-coumarins, followed by a regioselective intramolecular dehydration, involving the primary alcohols obtained and the enolic oxygen of the rings, promoted by Amberlyst 15 in boiling toluene, the new heterocycles 2,3,4,5-tetrahydro-6H-oxepino[3,2-c]pyran-6-one and [1]benzopyran-6-ones, were obtained in fair yields.
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