Visible Light-Mediated Atom Transfer Radical Addition via Oxidative and Reductive Quenching of Photocatalysts
作者:Carl-Johan Wallentin、John D. Nguyen、Peter Finkbeiner、Corey R. J. Stephenson
DOI:10.1021/ja300798k
日期:2012.5.30
visible light-mediated atom transfer radical addition (ATRA) of haloalkanes onto alkenes and alkynes using the reductive and oxidativequenching of [IrdF(CF(3))ppy}(2)(dtbbpy)]PF(6) and [Ru(bpy)(3)]Cl(2) is presented. Initial investigations indicated that the oxidativequenching of photocatalysts could effectively be utilized for ATRA, and since that report, the protocol has been expanded by broadening
Application of coumarin dyes for organic photoredox catalysis
作者:Andrea Gualandi、Giacomo Rodeghiero、Emanuele Della Rocca、Francesco Bertoni、Marianna Marchini、Rossana Perciaccante、Thomas Paul Jansen、Paola Ceroni、Pier Giorgio Cozzi
DOI:10.1039/c8cc04048f
日期:——
Here we report the application of readily prepared and available coumarin dyes for photoredoxcatalysis, which are able to mimic powerful reductant [Ir(III)] complexes. Coumarin derivatives 9 and 10 were employed as photoreductants in pinacol coupling and in other reactions, in the presence of Et3N as a sacrificial reducing agent. As the electronic, photophysical, and steric properties of coumarins
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
Photocatalytic ATRA reaction promoted by iodo-Bodipy and sodium ascorbate
作者:G. Magagnano、A. Gualandi、M. Marchini、L. Mengozzi、P. Ceroni、P. G. Cozzi
DOI:10.1039/c6cc09387f
日期:——
Using ascorbate as a sacrificial reductant, iodo-Bodipy dye is able to promote the ATRA reaction between bromoderivatives and alkenes.
使用抗坏血酸作为牺牲性还原剂,碘代-Bodipy染料能够促进溴衍生物和烯烃之间的ATRA反应。
Photo-Organocatalysis of Atom-Transfer Radical Additions to Alkenes
作者:Elena Arceo、Elisa Montroni、Paolo Melchiorre
DOI:10.1002/anie.201406450
日期:2014.11.3
haloalkanes onto olefins, one of the fundamental carbon–carbon bond‐forming transformations in organic chemistry. The reaction requires exceptionally mild reaction conditions to proceed, as it occurs at ambient temperature and under illumination by a readily available fluorescent light bulb. Initial investigations support a mechanism whereby the aldehydic catalyst photochemically generates the reactive