Journal ArticleDOI
Electrooxidation Enables Selective Dehydrogenative [4+2] Annulation between Indole Derivatives
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TLDR
Preliminary mechanism studies indicate that the electrooxidation annulation proceeds through radical-radical cross-coupling between in situ generated indole radical cation and N-centered radical.Abstract:
Dearomative annulation of indoles has emerged as a powerful tool for the preparation of polycyclic indoline-based alkaloids. Compared with well-established methods towards five-membered-ring-fused indolines, the six-membered-ring-fused indolines are rarely accessed under thermal conditions. Herein, a dearomative [4+2] annulation between different indoles is developed through an electrochemical pathway. This transformation offers a remarkably regio- and stereoselective route to highly functionalized pyrimido[5,4-b]indoles under oxidant- and metal-free conditions. Notably, this electrochemical approach maintains excellent functional-group tolerance and can be extended as a modification tactic for pharmaceutical research. Preliminary mechanism studies indicate that the electrooxidation annulation proceeds through radical-radical cross-coupling between an indole radical cation and an N-centered radical generated in situ.read more
Citations
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Photochemical and Electrochemical Applications of Proton-Coupled Electron Transfer in Organic Synthesis.
Philip R. D. Murray,James H. Cox,Nicolas D. Chiappini,Casey B. Roos,Elizabeth A. McLoughlin,Benjamin G. Hejna,Suong T. Nguyen,Hunter H. Ripberger,Jacob M. Ganley,Elaine Tsui,Nick Y. Shin,Brian Koronkiewicz,Guanqi Qiu,Robert R. Knowles +13 more
TL;DR: A review of the photochemical and electrochemical applications of multi-site proton-coupled electron transfer (MS-PCET) in organic synthesis can be found in this paper.
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Electrifying green synthesis: recent advances in electrochemical annulation reactions
TL;DR: In this article, the authors targeted electrochemical annulation reactions involving mediators and mediator-free conditions with generation of new C-C, C-heteroatom and heteroatom heteroatoms, their mechanistic insights, as well as the reactivity of substrates.
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Electrochemical 1,2-Diarylation of Alkenes Enabled by Direct Dual C–H Functionalizations of Electron-Rich Aromatic Hydrocarbons
TL;DR: A cobalt-promoted electrochemical 1,2-diarylation of alkenes with electron-rich aromatic hydrocarbons via direct dual C-H functionalizations is described, which employs a radical relay strategy to produce polyaryl-functionalized alkanes.
Journal ArticleDOI
A Cascade Rh(III)‐catalyzed C−H Activation/Chemodivergent Annulation of N‐carbamoylindoles with Sulfoxonium Ylides for the Synthesis of Dihydropyrimidoindolone and Tricyclic [1,3]Oxazino[3,4‐a]indol‐1‐ones Derivatives
Journal ArticleDOI
Rh(III)-Catalyzed C(sp2)–H functionalization/cyclization cascade of N-carboxamide indole and iodonium reagents for access to indoloquinazolinone derivatives
TL;DR: The sustainable synthesis of indoloquinazolinone derivatives from N-methoxycarbamoyl indoles and iodonium ylide reagents in methanol is described.
References
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