New metabolites of the lichen Buellia canescens(dicks.) de not: novel phthalide catabolites of depsidones
Abstract
The isolation and structural determination of the lichen metabolites dechlorodiploicin (2), dechloro-O-methyldiploicin (3), buellolide (4), and canesolide (6) are described; buellolide (4) and canesolide (6) are thought to arise by catabolism of their congeneric depsidones, in the latter case with Smiles rearrangement.