Hydrosulfonylation of Unactivated Alkenes by Visible Light Photoredox Catalysis
作者:Juan-Juan Wang、Wei Yu
DOI:10.1021/acs.orglett.9b03636
日期:2019.11.15
hydrosulfonylation of unactivated alkenes with sodium sulfinates was realized via [Ir(dF(CF3)ppy)2(dtbbpy)]PF6-mediated visiblelightphotoredoxcatalysis. The presence of an acid such as acetic acid is essential for the reaction to take place. A variety of unactivated alkenes can be transformed into sulfones with good yield and high regioselectivity using this reaction, which is proposed to proceed by a radical
Anti‐Markovnikov Hydroazidation of Alkenes by Visible‐Light Photoredox Catalysis
作者:Juan‐Juan Wang、Wei Yu
DOI:10.1002/chem.201806371
日期:2019.3.7
under visible‐light irradiation by using [Ir(dF(CF3)ppy)2(dtbbpy)]PF6 as the photocatalyst and trimethylsilyl azide as the azidating agent. The reactions were greatly facilitated by water, the beneficial effect of which can be attributed to its participation in the reaction as the hydrogen donor, as indicated by deuterium isotope experiments. The reactions proceed under solvent free conditions in the
Brønsted Base Assisted Photoredox Catalysis: Proton Coupled Electron Transfer for Remote C−C Bond Formation via Amidyl Radicals
作者:Jiaqi Jia、Yee Ann Ho、Raoul F. Bülow、Magnus Rueping
DOI:10.1002/chem.201802907
日期:2018.9.20
The synthesis of alkyne‐ and alkene‐decorated lactams has been achieved through a photoredox‐initiated radical cascade reaction. The developed Brønsted base assisted, photoredox‐catalyzed, intramolecular 5‐exo‐trig cyclization/intermolecular radical addition/elimination reaction provides facile access to functionalized γ‐lactams, with good functional group tolerance and high yields.
Trifluoromethylchlorosulfonylation of Alkenes: Evidence for an Inner-Sphere Mechanism by a Copper Phenanthroline Photoredox Catalyst
作者:Dattatraya B. Bagal、Georgiy Kachkovskyi、Matthias Knorn、Thomas Rawner、Bhalchandra M. Bhanage、Oliver Reiser
DOI:10.1002/anie.201501880
日期:2015.6.8
A visible‐light‐mediated procedure for the unprecedented trifluoromethylchlorosulfonylation of unactivated alkenes is presented. It uses [Cu(dap)2]Cl as catalyst, and contrasts with [Ru(bpy)3]Cl2, [Ir(ppy)2(dtbbpy)]PF6, or eosin Y that exclusively give rise to trifluoromethylchlorination of the same alkenes. It is assumed that [Cu(dap)2]Cl plays a dual role, that is, acting both as an electron transfer
motifs in many areas, among which the emerging sulfur(VI) fluoride exchange (SuFEx) click chemistry is the most prominent. Here, we report the first three-component aminofluorosulfonylation of unactivatedolefins by merging photoredox-catalyzed proton-coupled electron transfer (PCET) activation with radical relay processes. Various aliphatic sulfonyl fluorides featuring a privileged 5-membered heterocyclic