An Umpolung Approach to Acyclic 1,4‐Dicarbonyl Amides via Photoredox‐Generated Carbamoyl Radicals

A method for the generation and reaction of carbamoyl radicals from oxamate salts, followed by reaction with electron‐poor olefins, is described. The oxamate salt acts as a reductive quencher in the photoredox catalytic cycle, allowing mild and mass‐efficient formation of 1,4‐dicarbonyl products; a...

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Published inChemistry : a European journal Vol. 29; no. 28; pp. e202300403 - n/a
Main Authors Williams, Jason D., Leach, Stuart G., Kerr, William J.
Format Journal Article
LanguageEnglish
Published WEINHEIM Wiley 16.05.2023
Wiley Subscription Services, Inc
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ISSN0947-6539
1521-3765
1521-3765
DOI10.1002/chem.202300403

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Abstract A method for the generation and reaction of carbamoyl radicals from oxamate salts, followed by reaction with electron‐poor olefins, is described. The oxamate salt acts as a reductive quencher in the photoredox catalytic cycle, allowing mild and mass‐efficient formation of 1,4‐dicarbonyl products; a challenging transformation in the context of functionalized amide formation. Increased understanding has been obtained by the use of ab initio calculations, in support of experimental observations. Furthermore, steps have been taken towards an environmentally‐friendly protocol, by utilizing sodium as a cheap and low mass counterion, and demonstrating successful reactions using a metal‐free photocatalyst and a sustainable, non‐toxic solvent system. Photoredox catalysis is used to generate carbamoyl radicals from oxamate salts. Addition to a range of electron‐poor olefins gives the 1,4‐amido‐carbonyl products in good yields. The reaction proceeds under mild conditions, and a transition metal or organic photocatalyst can be employed.
AbstractList A method for the generation and reaction of carbamoyl radicals from oxamate salts, followed by reaction with electron-poor olefins, is described. The oxamate salt acts as a reductive quencher in the photoredox catalytic cycle, allowing mild and mass-efficient formation of 1,4-dicarbonyl products; a challenging transformation in the context of functionalized amide formation. Increased understanding has been obtained by the use of ab initio calculations, in support of experimental observations. Furthermore, steps have been taken towards an environmentally-friendly protocol, by utilizing sodium as a cheap and low mass counterion, and demonstrating successful reactions using a metal-free photocatalyst and a sustainable, non-toxic solvent system.
A method for the generation and reaction of carbamoyl radicals from oxamate salts, followed by reaction with electron‐poor olefins, is described. The oxamate salt acts as a reductive quencher in the photoredox catalytic cycle, allowing mild and mass‐efficient formation of 1,4‐dicarbonyl products; a challenging transformation in the context of functionalized amide formation. Increased understanding has been obtained by the use of ab initio calculations, in support of experimental observations. Furthermore, steps have been taken towards an environmentally‐friendly protocol, by utilizing sodium as a cheap and low mass counterion, and demonstrating successful reactions using a metal‐free photocatalyst and a sustainable, non‐toxic solvent system. Photoredox catalysis is used to generate carbamoyl radicals from oxamate salts. Addition to a range of electron‐poor olefins gives the 1,4‐amido‐carbonyl products in good yields. The reaction proceeds under mild conditions, and a transition metal or organic photocatalyst can be employed.
A method for the generation and reaction of carbamoyl radicals from oxamate salts, followed by reaction with electron-poor olefins, is described. The oxamate salt acts as a reductive quencher in the photoredox catalytic cycle, allowing mild and mass-efficient formation of 1,4-dicarbonyl products; a challenging transformation in the context of functionalized amide formation. Increased understanding has been obtained by the use of ab initio calculations, in support of experimental observations. Furthermore, steps have been taken towards an environmentally-friendly protocol, by utilizing sodium as a cheap and low mass counterion, and demonstrating successful reactions using a metal-free photocatalyst and a sustainable, non-toxic solvent system.A method for the generation and reaction of carbamoyl radicals from oxamate salts, followed by reaction with electron-poor olefins, is described. The oxamate salt acts as a reductive quencher in the photoredox catalytic cycle, allowing mild and mass-efficient formation of 1,4-dicarbonyl products; a challenging transformation in the context of functionalized amide formation. Increased understanding has been obtained by the use of ab initio calculations, in support of experimental observations. Furthermore, steps have been taken towards an environmentally-friendly protocol, by utilizing sodium as a cheap and low mass counterion, and demonstrating successful reactions using a metal-free photocatalyst and a sustainable, non-toxic solvent system.
Author Williams, Jason D.
Leach, Stuart G.
Kerr, William J.
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Issue 28
Keywords PHOTOCHEMICAL GENERATION
amides
ALKYL RADICALS
ACIDS
CATALYZED SYNTHESIS
ACYL RADICALS
radical reactions
REACTIVITY
photochemistry
CHEMISTRY
photoredox catalysis
synthetic methods
BETA-LACTAMS
CYCLIZATION
Language English
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Snippet A method for the generation and reaction of carbamoyl radicals from oxamate salts, followed by reaction with electron‐poor olefins, is described. The oxamate...
A method for the generation and reaction of carbamoyl radicals from oxamate salts, followed by reaction with electron-poor olefins, is described. The oxamate...
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StartPage e202300403
SubjectTerms Alkenes
Amides
Chemistry
Chemistry, Multidisciplinary
photochemistry
photoredox catalysis
Physical Sciences
radical reactions
Radicals
Science & Technology
synthetic methods
Title An Umpolung Approach to Acyclic 1,4‐Dicarbonyl Amides via Photoredox‐Generated Carbamoyl Radicals
URI https://onlinelibrary.wiley.com/doi/abs/10.1002%2Fchem.202300403
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https://www.ncbi.nlm.nih.gov/pubmed/36862066
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Volume 29
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