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9 results on '"Marine Desage-El Murr"'

2. C−N Bond Formation from a Masked High-Valent Copper Complex Stabilized by Redox Non-Innocent Ligands

Author

Pauline Chaumont, Marine Desage-El Murr, Jérémy Jacquet, Geoffrey Gontard, Louis Fensterbank, Maylis Orio, Hervé Vezin, Sébastien Blanchard, Institut Parisien de Chimie Moléculaire (IPCM), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Institut des Sciences Moléculaires de Marseille (ISM2), Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement - UMR 8516 (LASIRE), Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Centrale Lille Institut (CLIL), Méthodes et Application en Chimie Organique (MACO), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Université de Lille, CNRS, Institut des Sciences Moléculaires de Marseille [ISM2], Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement - UMR 8516 [LASIRE], and Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)

Subjects
chemistry.chemical_element, Photochemistry, 010402 general chemistry, Redox, 01 natural sciences, Catalysis, Reductive elimination, Metal, Nucleophile, Oxidation state, redox chemistry, ligand effects, Chemistry, Ligand, 010405 organic chemistry, General Chemistry, reaction mechanisms, copper, density functional calculations, General Medicine, Copper, Non-innocent ligand, 0104 chemical sciences, [CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry, visual_art, visual_art.visual_art_medium
Abstract

The reactivity of a stable copper(II) complex bearing fully oxidized iminobenzoquinone redox ligands towards nucleophiles is described. In sharp contrast with its genuine low-valent counterpart bearing reduced ligands, this complex performs high-yielding C−N bond formations. Mechanistic studies suggest that this behavior could stem from a mechanism akin to reductive elimination occurring at the metal center but facilitated by the ligand: it is proposed that a masked high oxidation state of the metal can be stabilized as a lower copper(II) oxidation state by the redox ligands without forfeiting its ability to behave as a high-valent copper(III) center. These observations are substantiated by a combination of advanced EPR spectroscopy techniques with DFT studies. This work sheds light on the potential of redox ligands as promoters of unusual reactivities at metal centers and illustrates the concept of masked high-valent metallic species. 55;36

Published
2016
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3. Non‐Innocent Ligands: New Opportunities in Iron Catalysis

Author

Virginie Mouriès-Mansuy, Etienne Derat, Louis Fensterbank, Marine Desage-El Murr, Max Malacria, Sébastien Blanchard, Géosciences Rennes (GR), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers de Rennes (OSUR)-Centre National de la Recherche Scientifique (CNRS), Institut Parisien de Chimie Moléculaire (IPCM), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Agence Nationale pour la Recherche (ANR), Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers de Rennes (OSUR), and Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Redox chemistry, [CHIM.ORGA]Chemical Sciences/Organic chemistry, 010405 organic chemistry, Chemistry, Iron, 010402 general chemistry, 01 natural sciences, Combinatorial chemistry, Redox, Non-innocent ligand, 0104 chemical sciences, Catalysis, Inorganic Chemistry, Density functional calculations, Non-innocent ligands (NILs), Organic chemistry, Low-valent iron complexes
Abstract

International audience; Introduced in the late sixties, non-innocent (or redox) ligands have been extensively studied for their unusual and intriguing chemical behavior. Their ability to delocalize and/or provide electrons to the metal center of organometallic complexes confers them undisputable chemical interest and has proved valuable in the development of novel synthetic methodologies. This review will focus on the chemistry and applications of low-valent iron complexes bearing potentially non-innocent ligands. Because of the elusive nature of these ligands, and whenever possible, theoretical calculations and analysis of spectroscopic data will be presented in an effort to provide insights into the catalytic activity of the complexes.

Published
2011
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4. Synthesis of Pulvinic Acid and Norbadione A Analogues by Suzuki–Miyaura Cross-Coupling of Benzylated Intermediates

Author

Charles Mioskowski, Thierry Le Gall, Marine Desage-El Murr, Stéphanie Nowaczyk, Institut Gilbert-Laustriat : Biomolécules, Biotechnologie, Innovation Thérapeutique, Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), and Klotz, Evelyne

Subjects
Norbadione A, chemistry.chemical_compound, Chemistry, Organic Chemistry, Organic chemistry, Physical and Theoretical Chemistry, Pulvinic acid
Abstract

Pulvinic acid and norbadione A analogues can be prepared by Suzuki–Miyaura cross-coupling of functionalized arylboronic esters with appropriate vinyl triflates, in which the hydroxy functions are protected either with methyl or benzyl groups, the latter being cleaved in a more reliable fashion at the end of the synthetic sequence. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)

Published
2006
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5. A Powerful Antiradiation Compound Revealed by a New High-Throughput Screening Method

Author

Stéphane Meunier, Charles Mioskowski, Alain Valleix, Jean Philippe Renault, Stéphanie Nowaczyk, Eric Saint-Aman, Marine Desage-El Murr, Thierry Le Gall, Didier Boquet, Frédéric Taran, Christophe Créminon, and Serge Pin

Subjects
Time Factors, High-throughput screening, Drug Evaluation, Preclinical, Radiation-Protective Agents, Biochemistry, Antioxidants, Biological Factors, 4-Butyrolactone, Screening method, medicine, Molecular Biology, Phenylacetates, Immunoassay, Dose-Response Relationship, Drug, medicine.diagnostic_test, Plant Extracts, Chemistry, Organic Chemistry, DNA, Combinatorial chemistry, Solubility, Evaluation Studies as Topic, Molecular Medicine, Agaricales, Thymidine
Abstract

We present a new high-throughput screening method for the selection of powerful water-soluble antiradiation compounds. This method, which uses conventional immunoassay techniques, allowed the capacity of a given compound to protect thymidine from irradiation to be evaluated. By applying this assay to an antioxidant library, we showed for the first time that norbadione A, a well-known mushroom pigment, has pronounced atypical antiradiation properties.

Published
2004
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6. ChemInform Abstract: Tandem C-H Activation/Arylation Catalyzed by Low-Valent Iron Complexes with Bisiminopyridine Ligands

Author

Sébastien Blanchard, Louis Fensterbank, Marine Desage-El Murr, Elise Salanouve, Etienne Derat, and Ghania Bouzemame

Subjects
Electron transfer, Tandem, Chemistry, Ligand, Substrate (chemistry), sense organs, General Medicine, Medicinal chemistry, Catalysis
Abstract

The reaction is proposed to proceed through a metal-based inner-sphere C-H activation involving concomitant electron transfer from the ligand and the substrate.

Published
2014
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7. ChemInform Abstract: Copper-Catalyzed N-Arylation of Sulfonimidamides

Author

Louis Fensterbank, Stéphane Azzaro, Marine Desage-El Murr, Max Malacria, and Emmanuel Lacôte

Subjects
chemistry.chemical_compound, Chemistry, Aryl, Copper catalyzed, Organic chemistry, General Medicine
Abstract

A microwave-assisted protocol is developed for the reaction of the substrates with aryl iodides in a short time.

Published
2011
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8. ChemInform Abstract: Suzuki-Miyaura Coupling of NHC-Boranes: A New Addition to the C-C Coupling Toolbox

Author

Malika Makhlouf Brahmi, Carine Robert, Max Malacria, Shau-Hua Ueng, Dennis P. Curran, Marine Desage-El Murr, Julien Monot, Louis Fensterbank, and Emmanuel Lacôte

Subjects
Coupling (electronics), C c coupling, Chemistry, Computational chemistry, Boranes, General Medicine, Bond formation
Abstract

Complexes of triaryl- and trialkylboranes with N-heterocyclic carbenes (NHCs) participate in Suzuki−Miyaura cross-coupling reactions and provide coupled products in good yields under base-free conditions. The reaction can be applied to Csp2−Csp2 and Csp2−Csp3 carbon−carbon bond formation with triflates, iodides, bromides, and chlorides. These results enrich the utility of NHC−borane complexes, which can be added to the toolkit of Suzuki−Miyaura cross-couplings, along with boronic acids and organotrifluoroborates.

Published
2010
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9. ChemInform Abstract: Total Synthesis of Norbadione A (I)

Author

Marine Desage-El Murr, Claude Lion, Catherine Willis, Celia Billaud, Charles Mioskowski, Loïc Toupet, Stephanie Nowaczyk, Aurélie Mallinger, Thierry Le Gall, and Yann Bourdreux

Subjects
Norbadione A, chemistry.chemical_compound, Chemistry, Total synthesis, Nanotechnology, General Medicine
Published
2008
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