Substitution Controlled Functionalization of <i>ortho</i>-Bromobenzylic Alcohols via Palladium Catalysis: Synthesis of Chromenes and Indenols
作者:Lodi Mahendar、Gedu Satyanarayana
DOI:10.1021/jo402763m
日期:2014.3.7
transformation of simple ortho-bromobenzyl tertiaryalcohols to chromenes is presented. Their formation is believed to proceed via the formation of a five-membered palladacycle, which, in turn, involves in an intermolecular homocoupling with the second ortho-bromobenzyltertiary alcohol to yield the homo-biaryl bond followed by intramolecular C–O bond formation. Interestingly, when there is an allylic substituent