Evidence for in Situ Catalyst Modification during the Pd-Catalyzed Conversion of Aryl Triflates to Aryl Fluorides
作者:Thomas J. Maimone、Phillip J. Milner、Tom Kinzel、Yong Zhang、Michael K. Takase、Stephen L. Buchwald
DOI:10.1021/ja208461k
日期:2011.11.16
A mechanistic investigation of the Pd-catalyzed conversion of aryl triflates to fluorides is presented. Studies reveal that C F reductive elimination from a LPdII(aryl)F complex (L = t-BuBrettPhos or RockPhos) does not occur when the aryl group is electron rich. Evidence is presented that a modified phosphine, generated in situ, serves as the actual supporting ligand during catalysis with such substrates. A preliminary study of the reactivity of a LPcII(aryl)F complex based on this modified ligand is reported.