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 lichen Roccella 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.
从地衣 Roccella montagnei 中以 7.3% 的产率分离出的红蛋白通过 Smiles 重排转化为一系列二苯醚。那些在 C-1 处具有游离羧酸的化合物在 Pd(OAc)2 存在下经历了一种新型的脱羧氧化环化反应,生成 5-脱羧基二苯并呋喃。测定了所有化合物的抗氧化和β-葡萄糖醛酸酶抑制活性。