Abstract
From the leaves of Xylopia vielana (Annonaceae) the three dimeric guaianes vielanin A–C were isolated and structurally elucidated by mass and NMR spectroscopy as 1–3. The structure of 1 contains a bridged ring system formed probably via a Diels–Alder reaction of two different guaiane monomers. Compounds 2 and 3 represent symmetric cyclobutanes formally generated from two equal guaiane moieties by [2+2] cycloaddition.
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