Copper sees the light of day: [Cu(dap)2Cl] proved to be an excellent photoredoxcatalyst for atom‐transfer radical addition reactions, as well as for allylation reactions (see scheme), providing an attractive alternative to commonly used iridium‐ and ruthenium‐based catalysts.
Intermolecular Atom Transfer Radical Addition to Olefins Mediated by Oxidative Quenching of Photoredox Catalysts
作者:John D. Nguyen、Joseph W. Tucker、Marlena D. Konieczynska、Corey R. J. Stephenson
DOI:10.1021/ja108560e
日期:2011.3.30
Atom transfer radical addition of haloalkanes and α-halocarbonyls to olefins is efficiently performed with the photocatalyst Ir[(dF(CF(3))ppy)(2)(dtbbpy)]PF(6). This protocol is characterized by excellent yields, mild conditions, low catalyst loading, and broad scope. In addition, the atom transfer protocol can be used to quickly and efficiently introduce vinyl trifluoromethyl groups to olefins and
series of heteroleptic [Cu(phenantroline)(bisisonitrile)]+-complexes was synthesized, and their structural, spectroscopic, and electrochemical properties were investigated. The new copper(I) complexes were employed as photoredox-catalysts in the visible-light-mediated atom transfer radical addition (ATRA). Especially, [Cu(dpp)(binc)]BF4 (6a-BF4)(dpp = 2,9-diphenyl-1,10-phenanthroline; binc = bis(2-isocyanophenyl)