palladium-catalyzed cross-coupling of o-allylic and o-vinylic phenols with vinylic halides and triflates produces substituted dihydrobenzopyrans and dihydrobenzofurans respectively in good to high yields. The proposed mechanism involves vinylpalladium addition to the olefin, rearrangement to a π-allylpalladium intermediate and subsequent intramolecular nucleophilic displacement of palladium.
Palladium-catalyzed cross-coupling of unsaturated phenols with vinylic halides and triflates
作者:Richard C. Larock、Hoseok Yang、Paola Pace、Sandro Cacchi、Giancarlo Fabrizi
DOI:10.1016/s0040-4039(97)10502-0
日期:1998.1
The palladium-catalyzed cross-coupling of o-vinylic phenols with vinylic halides and triflates produces substituted dihydrobenzopyrans and dihydrobenzofurans respectively in good to high yields.