9 Gold in Photocatalysis
Book
Editor: König, B.
Title: Photocatalysis in Organic Synthesis
Print ISBN: 9783132417021; Online ISBN: 9783132417069; Book DOI: 10.1055/b-006-161273
1st edition © 2019. Thieme. All rights reserved.
Georg Thieme Verlag KG, Stuttgart
Subjects: Organic Chemistry;Chemical Reactions, Catalysis;Organometallic Chemistry;Laboratory Techniques, Stoichiometry
Science of Synthesis Reference Libraries
Parent publication
Title: Science of Synthesis
DOI: 10.1055/b-00000101
Series Editors: Fürstner, A. (Editor-in-Chief); Carreira, E. M.; Faul, M.; Kobayashi, S.; Koch, G.; Molander, G. A.; Nevado, C.; Trost, B. M.; You, S.-L.
Type: Multivolume Edition
Abstract
Dual catalytic systems combining gold and photocatalysis are capable of facilitating redox-neutral coupling reactions that are otherwise seldom observed using gold catalysts alone. The challenging oxidation of gold(I) to gold(III) in these processes is achieved through two single-electron-transfer steps involving photogenerated organic radicals derived most commonly from arenediazonium salts. In addition to analogues of some classical cross-coupling processes that are tolerant of halogen functionalities, arylative 1,2-difunctionalization reactions of π-systems, combining the traditional π-Lewis acidity of gold catalysts with coupling, are accessible. These processes can be performed on alkene, allene, and alkyne substrates with the unique mechanistic features of dual gold/photoredox catalysis allowing for improved selectivity for cross coupling compared to that observed in alternative oxidative gold-catalyzed coupling methodologies.
Key words
photocatalysis - gold catalysis - photoredox catalysis - cross coupling - 1,2-difunctionalization - arylation - diazonium salts - dual catalysis - visible light - alkenes - allenes - alkynes - redox-neutral coupling - radical intermediates - aryl radicals- 26 Alcaide B, Almendros P, Aparicio B, Lázaro-Milla C, Luna A, Faza ON. Adv. Synth. Catal. 2017; 359: 2789
- 32 Wang Z.-S, Tan T.-D, Wang C.-M, Yuan D.-Q, Zhang T, Zhu P, Zhu C, Zhou J.-M, Ye L.-W. Chem. Commun. (Cambridge) 2017; 53: 6848