O-(Dihydrobenzofuranyl)-dibenzo-α-pyrones from Umtiza listerana

Abstract

The novel metabolites (2′ S,3′ R)-3,10-dihydroxy-9- O-(6′-hydroxy-2′-hydroxymethyldihydrofuran-3-yl)-dibenz-[b,d]-pyran-6-one and its 5′,6′-dihydroxy analogue are accompanied in the heartwood of Umtiza listerana by several known flavonoids and the parent 3,9,10-trihydroxydibenz-[b,d]-pyran-6-one. The latter, used for structural elucidation of the complex dibenzo-α-pyrones, was synthesized via a Hurtley condensation.