A new synthesis of the lichen depsidone diploicin (2,4,7,9-tetrachloro-3-hydroxy-8-methoxy-1,6-dimethyldibenzo[b,e][1,4]dioxepin-11-one)(1), and a synthesis of the lichen depsidone gangaleoidin (methyl 2,4-dichloro-3-hydroxy-8-methoxy-1,6-dimethyl-11-oxo-11H-dibenzo[b,e][1,4]dioxepin-7-carboxylate)(2) are described. The key step in both syntheses was an Ullmann reaction.
P. Djura, M. V. Sargent and P. Vogel, J. Chem. Soc., Perkin Trans. 1, 1976, 147 DOI: 10.1039/P19760000147
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