A rhodium-catalyzed carbonylative transformation of unactivated phenols to arylsalicylates is described. This protocol is characterized by utilizing 1,3-rhodium migration as the key step to provide direct access to synthesize o-hydroxyaryl esters. Various desired aryl o-hydroxybenzoates were produced in moderate to excellent yields with bis(dicyclohexylphosphino)ethane (DCPE) as the ligand. Interestingly
Hydroxyl-directed C–C bond activation of benzophenones for the O-acylation of phenols
作者:Constance B. Anderson、Siri Bruhn、Letitia J. Yao、Christopher J. Douglas
DOI:10.1016/j.tet.2022.133074
日期:2022.12
We report that 2-hydroxyl benzophenones can be converted to phenyl salicylate esters by loss of an aryl group and O-acylation of the phenols. Iridium, cyclooctadiene, and bulky monodentate phosphine ligands catalyze the ketone C–C bond activation and fragmentation. We identified common side products in this process, which include C-acylation of the phenol reactant or trapping on cyclooctadiene. Several