Intramolecular versus intermolecular oxidative couplings of ester tethered di-aryl ethers
作者:Stephen R. Taylor、Alison T. Ung、Stephen G. Pyne、Brian W. Skelton、Allan H. White
DOI:10.1016/j.tet.2007.08.082
日期:2007.11
The oxidative cyclization of 3,4-dimethoxyphenyl 3,4-dimethoxyphenylacetate, through intramolecular biphenyl bondformation, was successful and gave the target seven-membered lactone in good yield (85–86%). All other ester substrates gave biphenyl products or their further oxidized products via intermolecular coupling of their radicalcation intermediate with the neutral substrate. It appears that