Novel Entry into 5-Decarboxydibenzofurans via Smiles Rearrangement of the Lichen Para-Depside, Erythrin
作者:Vinitha M. Thadhani、Muhammad Iqbal Choudhary、Raymond J. Andersen、Veranja Karunaratne
DOI:10.3184/030823410x12677394014276
日期:2010.3
Erythrin, isolated in 7.3% yield from the lichenRoccella montagnei, was converted via a Smiles rearrangement to a series of diphenyl ethers. Those with a free carboxylic acid at C-1 underwent a novel decarboxylative oxidative cyclisation in the presence of Pd(OAc)2 to produce 5-decarboxydibenzofurans. All compounds were assayed for their antioxidant and β-glucuronidase enzyme inhibitory activity.