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  • J. M. Cameron, G. Guillemot, T. Galambos, S. S. Amin, E. Hampson, K. Mall Haidaraly, G. N. Newton, et G. Izzet, « Supramolecular assemblies of organo-functionalised hybrid polyoxometalates: from functional building blocks to hierarchical nanomaterials », Chemical Society Reviews, vol. 51, nᵒ 1, p. 293-328, 2022.
    Résumé : Organic–inorganic hybrid polyoxometalates are versatile building blocks for the self-assembly of functional supramolecular materials. , This review provides a comprehensive overview of recent advances in the supramolecular organisation and hierarchical self-assembly of organo-functionalised hybrid polyoxometalates (hereafter referred to as hybrid POMs), and their emerging role as multi-functional building blocks in the construction of new nanomaterials. Polyoxometalates have long been studied as a fascinating outgrowth of traditional metal-oxide chemistry, where the unusual position they occupy between individual metal oxoanions and solid-state bulk oxides imbues them with a range of attractive properties ( e.g. solubility, high structural modularity and tuneable properties/reactivity). Specifically, the capacity for POMs to be covalently coupled to an effectively limitless range of organic moieties has opened exciting new avenues in their rational design, while the combination of distinct organic and inorganic components facilitates the formation of complex molecular architectures and the emergence of new, unique functionalities. Here, we present a detailed discussion of the design opportunities afforded by hybrid POMs, where fine control over their size, topology and their covalent and non-covalent interactions with a range of other species and/or substrates makes them ideal building blocks in the assembly of a broad range of supramolecular hybrid nanomaterials. We review both direct self-assembly approaches (encompassing both solution and solid-state approaches) and the non-covalent interactions of hybrid POMs with a range of suitable substrates (including cavitands, carbon nanotubes and biological systems), while giving key consideration to the underlying driving forces in each case. Ultimately, this review aims to demonstrate the enormous potential that the rational assembly of hybrid POM clusters shows for the development of next-generation nanomaterials with applications in areas as diverse as catalysis, energy-storage and molecular biology, while providing our perspective on where the next major developments in the field may emerge.

  • D. Illuminati, A. Fantinati, T. De Ventura, D. Perrone, C. Sturaro, V. Albanese, E. Marzola, V. Cristofori, J. Oble, G. Poli, et C. Trapella, « Synthesis of 2,6-Dimethyltyrosine-Like Amino Acids through Pinacolinamide-Enabled C–H Dimethylation of 4-Dibenzylamino Phenylalanine », The Journal of Organic Chemistry, vol. 87, nᵒ 5, p. 2580-2589, mars 2022.
    Résumé : The synthesis of a small library of NH-Boc- or NH-Fmoc-protected l-phenylalanines carrying methyl groups at positions 2 and 6 and diverse functionalities at position 4 has been achieved. The approach, which took advantage of a Pd-catalyzed directed C–H dimethylation of picolinamide derivatives, allowed the electronic and steric properties of the resulting amino acid derivatives to be altered by appending a variety of electron-withdrawing, electron-donating, or bulky groups.
    Mots-clés : POLE 1, ROCS.

  • S. Kassamba, A. Perez-Luna, F. Ferreira, et M. Durandetti, « Modular access to substituted germoles by intramolecular germylzincation », Chemical Communications, vol. 58, nᵒ 24, p. 3901-3904, mars 2022.
    Résumé : Intramolecular alkyne germylzincation giving access to a wide range of germoles is achieved from triarylhydrogermanes in the presence of diethylzinc and AIBN as radical initiator. The reaction proceeds through activation of the Ge–H bond, leading to a heteroarylzinc intermediate after cyclisation, which can then be involved in a post-functionalisation reaction. Our results show that only 5-endo-dig cyclizations occur, with benzogermoles being exclusively obtained.
    Mots-clés : POLE 1, ROCS.

  • R. Sala, G. Kiala, L. F. Veiros, G. Broggini, G. Poli, et J. Oble, « Redox-Neutral Ru(0)-Catalyzed Alkenylation of 2-Carboxaldimine-heterocyclopentadienes », The Journal of Organic Chemistry, vol. 87, nᵒ 7, p. 4640-4648, avr. 2022.
    Résumé : A new Ru3(CO)12-catalyzed directed alkenylation of 2-carboxaldimine-heterocyclopentadienes has been accomplished. This process allows coupling of furan, pyrrole, indole, and thiophene 2-carboxaldimines with electron-poor alkenes such as acrylates, vinylsulfones, and styrenes. This regio- and chemoselective oxidative C–H coupling does not require the presence of an additional sacrificial oxidant. Density functional theory calculations allowed us to propose a mechanism and unveiled the nature of the H2 acceptor.
    Mots-clés : POLE 1, ROCS.

  • J. Sanz Garcia, M. Gaschard, I. Navizet, M. Sahihi, S. Top, Y. Wang, P. Pigeon, A. Vessières, M. Salmain, et G. Jaouen, « Inhibition of cathepsin B by ferrocenyl indenes highlights a new pharmacological facet of ferrocifens », European Journal of Inorganic Chemistry, vol. n/a, nᵒ n/a, janv. 2022.
    Résumé : The family of ferrocifens initially built up from the anti-estrogen tamoxifen shows a broad antitumor activity both  in vitro  and  in vivo . Their mechanism of action relies on the presence of the redox motif [ferrocene-ene-phenol] that, under oxidative conditions, generates reactive oxygen species (ROS) and affords electrophilic quinone methides (QMs) having the ability to alkylate biological nucleophiles and in turn elicit a strong antiproliferative activity. In this context, the cysteine protease cathepsin B was initially presumed to be a target for ferrocenyl QMs.  In vitro  enzymatic assays ruled out this hypothesis but unexpectedly revealed that other ferrocifen metabolites, i.e. ferrocenyl indenes, acted as moderate inhibitors of cathepsin B. These experimental results were nicely confirmed by molecular docking calculations, that showed that the monophenol ferrocenyl indene and to a lower extent the diphenol interacted with the active site of cathepsin B, making it an unanticipated target of ferrocifens.
    Mots-clés : antitumor agent, bioorganometallic chemistry, CHEMBIO, computational chemistry, cysteine protease, docking, POLE 3.
    Note Note

  • Y. Wang, P. Pigeon, W. Li, J. Yan, P. M. Dansette, M. Othman, M. J. McGlinchey, et G. Jaouen, « Diversity-oriented synthesis and bioactivity evaluation of N-substituted ferrocifen compounds as novel antiproliferative agents against TNBC cancer cells », European Journal of Medicinal Chemistry, p. 114202, mars 2022.
    Résumé : Ferrociphenols are characterized by the presence of a biologically active redox motif [ferrocenyl-ene-p-phenol], and are known to exhibit anticancer properties. Recent studies have identified a new series of ferrociphenols that bear an imido-type heterocycle at the terminus of a short alkyl chain, and which showed very strong antiproliferativity against multiple types of cancer cells. This work describes the syntheses and an SAR study of ferrociphenols bearing a diversity-based range of nitrogen-containing substituents on the alkyl chain. Preliminary oxidative metabolism experiments and ROS-related bioactivity measurements were also carried out to probe the origin of the cytotoxicity of the imido-ferrociphenols. Furthermore, an interesting dimerization phenomenon was observed in the X-ray crystal structure of the 2,3-naphthalenedicarboximidopropyl-ferrocidiphenol, 21, which may be a factor in decreasing its rate of oxidation to form the corresponding quinone methide, 21-QM, thereby affecting its antitumor activity. These results suggest that both the formation rate and the stability of QMs could affect the antiproliferative activity of their ferrociphenol precursors.
    Mots-clés : Anticancer agents, Bioorganometallic chemistry, CHEMBIO, Ferrocene, Imides, POLE 3, Quinones.


  • M. Abdellaoui, A. Millanvois, E. Levernier, C. Ollivier, et L. Fensterbank, « Visible-Light-Mediated Z-Stereoselective Monoalkylation of β,β-Dichlorostyrenes by Photoredox/Nickel Dual Catalysis », Synlett, janv. 2021.
    Résumé : <p>Metal-catalyzed alkylation of 1,1-dihalovinyl moiety commonly suffers from both a lack of stereoselectivity and the overreaction leading to the dialkylation product. The methodology described herein features a new pathway to alkylate stereoselectively β,β-dichlorostyryl substrates to provide the <i>Z</i>-trisubstituted olefin only with fair to good yields. This cross-coupling reaction bears on the smooth and photoinduced formation of a C-centered radical that engages in a nickel-catalyzed organometallic cycle to form the key C<sub>sp2</sub>–C<sub>sp3</sub> bond.</p>
    Mots-clés : MACO, POLE 1.
    Pièce jointe Full Text PDF 507.5 ko (source)

  • M. Balas, S. Beaudoin, A. Proust, F. Launay, et R. Villanneau, « Advantages of Covalent Immobilization of Metal-Salophen on Amino-Functionalized Mesoporous Silica in Terms of Recycling and Catalytic Activity for CO2 Cycloaddition onto Epoxides », European Journal of Inorganic Chemistry, vol. 2021, nᵒ 16, p. 1581-1591, 2021.
    Résumé : NiII and MnIII Schiff base complexes (Salophen-Ni and Salophen-MnCl) bearing a pending carboxylic group were prepared and characterized. Both complexes were grafted onto a mesoporous amino-functionalized SBA-15 silica, by formation of an amide function between the propylamine groups of the support and the carboxylic acid functions of the salophen ligand (corresponding respective to 1.30 wt.% of Ni and 1.06 wt.% of Mn). The co-catalytic behaviour of the free and grafted complexes was then evaluated in the CO2 cycloaddition reaction onto styrene oxide, using tetra-butylammonium bromide (n−Bu4NBr) as the main catalyst. In homogeneous conditions, the MnIII Schiff base complex and the NiII one, to a lesser extent, behave as efficient co-catalysts for this reaction (styrene conversion of 100 % and 65 % respectively after 3 h at 120 °C, under 15 bars of CO2). Upon immobilization at the surface of the amino-functionalized SBA-15, we showed that the co-catalytic activity of the less efficient one, i. e. Ni2+ salophen complex, could be enhanced (reaching a full conversion after 7 h), hence highlighting a potential synergistic effect between the unused amine functions of the support and the Ni2+ salophen co-catalyst. Both salophen complexes were successfully re-used in homogeneous conditions or after their immobilization without any appreciable loss of activity. This work is only a first step towards a completely heterogeneous catalytic system, in which the tetraalkylammonium halide catalyst and the metal-salophen co-catalyst will both be covalently anchored on the same support.
    Mots-clés : CO2 valorization, Cyloaddition, E-POM, Hybrid catalysts, Mesoporous materials, POLE 2, Salen derivatives.
    Pièce jointe Full Text PDF 1.2 Mo (source)

  • M. Balas, L. K/Bidi, F. Launay, et R. Villanneau, « Chromium-Salophen as a Soluble or Silica-Supported Co-Catalyst for the Fixation of CO2 Onto Styrene Oxide at Low Temperatures », Frontiers in Chemistry, vol. 9, p. 765108, oct. 2021.
    Résumé : Addition of a soluble or a supported Cr III -salophen complex as a co-catalyst greatly enhances the catalytic activity of Bu 4 NBr for the formation of styrene carbonate from styrene epoxide and CO 2 . Their combination with a very low co-catalyst:Bu 4 NBr:styrene oxide molar ratio = 1:2:112 (corresponding to 0.9 mol% of Cr III co-catalyst) led to an almost complete conversion of styrene oxide after 7 h at 80°C under an initial pressure of CO 2 of 11 bar and to a selectivity in styrene carbonate of 100%. The covalent heterogenization of the complex was achieved through the formation of an amide bond with a functionalized {NH 2 }-SBA-15 silica support. In both conditions, the use of these Cr III catalysts allowed excellent conversion of styrene already at 50°C (69 and 47% after 24 h, respectively, in homogeneous and heterogeneous conditions). Comparison with our previous work using other metal cations from the transition metals particularly highlights the preponderant effect of the nature of the metal cation as a co-catalyst in this reaction, that may be linked to its calculated binding energy to the epoxides. Both co-catalysts were successfully reused four times without any appreciable loss of performance.
    Mots-clés : E-POM, POLE 2.

  • E. Benazzi, J. Karlsson, Y. Ben M'Barek, P. Chabera, S. Blanchard, S. Alves, A. Proust, T. Pullerits, G. Izzet, et E. A. Gibson, « Acid-triggering of light-induced charge-separation in hybrid organic/inorganic molecular photoactive dyads for harnessing solar energy », Inorganic Chemistry Frontiers, vol. 8, nᵒ 6, p. 1610-1618, 2021.
    Résumé : H + modulated charge-transfer in photoexcited covalently linked W and Mo Keggin-bodipy conjugates is demonstrated using transient absorption spectroscopy and photoluminescence. Adding acid switches on (W) or accelerates (Mo) charge separation. , H + modulated charge-transfer in photoexcited covalent polyoxometalate-bodipy conjugates is described. The hybrid organic/inorganic molecular photoactive dyads are based on Keggin-type polyoxometalates (POMs, where K M = [PM 11 O 39 ] and M = Mo or W) covalently grafted via an organotin linker to a bodipy (BOD) photosensitizer. The relative potentials of the photosensitizer and POM are aligned such that light-induced electron transfer from BOD to POM is permitted for the polyoxomolybdate KMoSn[BOD] but not effective for the polyoxotungstate analogue KWSn[BOD] . In both cases, the addition of acid shifts the redox potential of the POM only, to increase the driving force for electron transfer. This leads to charge-separation being switched on for KWSn[BOD] in the presence of acid. The addition of acid to KMoSn[BOD] accelerates charge-separation by an order of magnitude (from 2 ns to 200 ps) and is accompanied by a deceleration of charge recombination, leading to a charge-separated state lifetime of up to 1.3 μs. This behaviour is consistent with proton coupled electron transfer, which has previously been observed electrochemically for POMs, but this study shows, for the first time, the impact of protonation on photoinduced electron transfer.
    Mots-clés : CSOB, E-POM, POLE 2, POLE 3.

  • A. Benchohra, Y. Li, L. - M. Chamoreau, B. Baptiste, E. Elkaïm, N. Guillou, D. Kreher, et R. Lescouëzec, « The Atypical Hysteresis of [Fe(C6F5Tp)2]: Overlay of Spin-Crossovers and Symmetry-Breaking Phase Transition », Angewandte Chemie, vol. 133, nᵒ 16, p. 8885-8889, 2021.
    Résumé : The [FeII(C6F5Tp)2] spin-crossover complex is an atypical molecular switch, which can be converted upon annealing between two archetypal spin-crossover behaviours: from an extremely gradual spin-crossover to a broad hysteretic spin-transition (of ca. 65 K). The hysteresis shows an uncommon “rounded shape” that is reproducible upon cycling temperature. In depth structural studies reveal a first crystal phase transition, which occurs upon melting and recrystallizing at high temperature. This first irreversible transition is associated with a radical change in the crystal packing. More importantly, the “rounded and broad” hysteretic transition is shown to occur in a non-cooperative SCO system and is associated with the occurrence of a symmetry-breaking phase transition that appears when roughly ca. 50 % of the SCO complexes are switched.
    Mots-clés : ERMMES, POLE 2.

  • C. C. Bories, M. Barbazanges, E. Derat, et M. Petit, « Implication of a Silyl Cobalt Dihydride Complex as a Useful Catalyst for the Hydrosilylation of Imines », ACS Catalysis, vol. 11, nᵒ 22, p. 14262-14273, nov. 2021.
    Résumé : Here, we describe the formation and use of silyl cobalt (III) dihydride complexes as powerful catalysts for the hydrosilylation of a variety of imines starting from a low-valent well-defined cobalt (I) complex. The reaction is efficient at low catalyst loadings with a diverse range of imines bearing various protecting groups, as well as aliphatic ketimines and quinoline. Kinetics, DFT calculations, NMR spectroscopic studies, deuteration experiments, and X-ray diffraction analyses allowed us to propose a catalytic cycle based on silyl dihydrocobalt (III) complexes performing a hydrocobaltation.
    Mots-clés : MACO, POLE 1.

  • S. Boujday et M. Salmain, « Nanoparticules d’or pour les biocapteurs : lecture optique de la reconnaissance moléculaire », Photoniques, nᵒ 106, p. 39-43, janv. 2021.
    Résumé : Les propriétés extraordinaires des nanoparticules d’or et/ou d’argent en ont fait des objets courtisés par les scientifiques toutes disciplines confondues. L’intensité de leur couleur ainsi que leur grande sensibilité optique au milieu environnant en font de puissants transducteurs pour les biocapteurs ; que ce soit grâce à des spectrophotomètres ou simplement par observation à l’oeil nu. Elles assurent la lecture de la reconnaissance moléculaire via des scénarios variés alliant simplicité et faible coût.
    Mots-clés : CHEMBIO, POLE 3.

  • F. Carlet, G. Bertarini, G. Broggini, A. Pradal, et G. Poli, « Oxoammonium-Mediated Allylsilane–Ether Coupling Reaction », European Journal of Organic Chemistry, vol. 2021, nᵒ 15, p. 2162-2168, 2021.
    Résumé : A new C(sp3)−H functionalization reaction consisting of the oxidative α-allylation of allyl- and benzyl- methyl ethers has been developed. The C−C coupling could be carried out under mild conditions thanks to the use of cheap and green oxoammonium salts. The scope of the reaction was studied over 27 examples, considering the nature of the substituents on the two coupling partners.
    Mots-clés : Allylation, Benzyl ethers, C(sp3)−H functionalization, Cinnamyl ethers, Oxoammonium, ROCS.

  • L. Chang, N. Fischer-Durand, G. Gontard, B. Bertrand, S. Thorimbert, et L. Dechoux, « A solvent-free, catalyst-free formal [3+3] cycloaddition dearomatization strategy: towards new fluorophores for biomolecules labelling », ChemSusChem, vol. n/a, nᵒ n/a, 2021.
    Résumé : A general, sustainable dearomatization reaction for nitrogen-containing heterocycles was developed. Under solvent free conditions and without catalyst, the biorenewable methyl coumalate ( MC ) reacts as an efficient C3 partner to convert eleven types of basic aromatic rings into their pyrido[1,2-a] fused derivatives in good to excellent yields. The fluorescence properties of some of the products were harnessed to conjugate fluorescent tags to BSA and immunoglobulin G.
    Mots-clés : CHEMBIO, dearomatization reaction, fluorescent probes, methyl coumalate, Michael addition, Nitrogen heterocycles, POLE 3.
    Pièce jointe Snapshot 500.5 ko (source)

  • F. Chemla et A. Perez-Luna, « 2.5 Radical–Polar Crossover Reactions », in Free Radicals: Fundamentals and Applications in Organic Synthesis 2, 2021ᵉʳ éd., Thieme Verlag, 2021.
    Résumé : Radical–polar crossover reactions, that is, single-electron redox events allowing for the interconversion between radical and ionic intermediates, make it possible to connect radical and polar processes in the same synthetic transformation. Such a combination is the basis of much original synthetic methodology, which is particularly useful in the context of domino, tandem, or multicomponent reactions. This chapter comprehensively covers the field of radical–polar crossover reactions, with a primary emphasis on transformations wherein both the radical and polar processes provide synthetic elaboration.
    Mots-clés : Organic Chemistry, POLE 1, ROCS.
    Pièce jointe Snapshot 617.9 ko (source)

  • S. Curpanen, G. Poli, J. Oble, et A. Perez‐Luna, « C(sp2)−Si Bond Functionalization through Intramolecular Activation by Alkoxides », European Journal of Organic Chemistry, vol. 2021, nᵒ 7, p. 1055-1071, 2021.
    Résumé : Organosilicon reagents are invaluable tools in the hands of the modern chemist that allow accomplishing a number of synthetically useful transformations. While some are standard reactions, others are more complex transformations, such as the Brook rearrangement and its variants. This carbon-to-oxygen silyl migration represents a privileged method to generate transient carbanionic species well suited to undergo functionalization upon electrophilic substitution in the presence of an electrophile. This minireview focuses on recent advances in C(sp2)−Si bond functionalization through intramolecular activation by alkoxides. The key elements of reactivity will be highlighted in the introduction to allow the proper understanding of the migration process. Then, an overview of the reactivity of substrates incorporating the C(sp2)−Si motif and their synthetic applications will be provided.
    Mots-clés : Anion Relay Chemistry, Brook rearrangement, Hiyama cross-coupling, POLE 1, ROCS, Silyl migration, Synthetic methods.
    Pièce jointe Snapshot 484.1 ko (source)

  • K. de la Vega-Hernández, F. Chemla, F. Ferreira, O. Jackowski, et A. Perez-Luna, « Radical Germylzincation of Aryl- and Alkyl-Substituted Internal Alkynes », Organic Letters, vol. 23, nᵒ 11, p. 4426-4430, juin 2021.
    Résumé : The stereoselective germylzincation of internal alkynes delivering trisubstituted vinylgermanes is achieved via a radical chain process involving Ph3GeH and Et2Zn with AIBN as the initiator. Excellent levels of regiocontrol are observed for nonsymmetric (aryl, alkyl)-substituted alkynes and for propargylic alcohols with aryl-, alkyl-, or silyl-substituted alkynes. The germylzincation reaction can be combined in one pot with the Cu(I)-mediated electrophilic substitution of the C(sp2)–Zn bond to obtain synthetically challenging tetrasubstituted vinylgermanes.
    Mots-clés : POLE 1, ROCS.

  • K. de la Vega-Hernández, K. Isaac, F. Chemla, F. Ferreira, O. Jackowski, et A. Perez-Luna, « Radical Silyl- and Germylzincation of Propargylic Alcohols », Helvetica Chimica Acta, vol. 104, nᵒ 10, p. e2100128, 2021.
    Résumé : The silyl- and germylzincation of terminal or internal propargylic alcohols by reaction with (Me3Si)3SiH/Et2Zn, [(Me3Si)3Si]2Zn/Et2Zn or Ph3GeH/Et2Zn is examined. These reactions proceed through the addition of silicon- or germanium-centered radicals across the carbon≡carbon triple bond followed by the trapping by diethylzinc of the produced vinyl radical through homolytic substitution at the zinc atom. The influence of the hydroxy unit on the regio- and stereoselectivity of these reactions is discussed and compared to its role played in radical hydrosilylation and hydrogermylation reactions. Protocols developed to achieve the β-regioselective silylzincation of propargyl alcohol and the α-regioselective germylzincation of internal propargylic alcohols are particularly important, as they occur with trans stereoselectivity. For both procedures the C(sp2)−Zn bond remains available for subsequent in-situ electrophilic substitution leading overall to net alkyne trans difunctionalization.
    Mots-clés : germanium, germylmetalation, POLE 1, propargylic alcohols, radical reactions, ROCS, silylmetalation, zinc.

  • T. Deis, F. Medici, A. Poussard-Schulz, G. Lemière, et L. Fensterbank, « Synthesis and reactivity of an anionic NHC-borane featuring a weakly coordinating silicate anion », Journal of Organometallic Chemistry, vol. 956, p. 122120, déc. 2021.
    Résumé : We report herein the synthesis of a new NHC-stabilised borane complex featuring a weakly coordinating anion, namely a pentaorganosilicate, on the NHC backbone. The synthesis can be achieved from a zwitterionic abnormal silicate-imidazolium adduct by deprotonation with a strong base followed by quenching with a borane transfer agent. Alternatively, the IPr-BH3 complex can also be deprotonated and the resulting vinylanion is trapped by a tetravalent spirosilane. The first structural data on a lithium derivative of an anionic NHC-borane complex functionalized by a silicate have been obtained and reveal an interaction between the three hydrogens of the borane and the lithium cation. Assessment of the reactivity highlights the higher hydridicity of the anionic NHC-borane compared to the parent IPr-BH3. Finally, electronic properties of this new species have been evaluated by means of DFT calculations and the presence of the silicate on the NHC backbone raises the HOMO which can in part explain the high hydride-donor abilities. This is consistent with the smooth reduction of an aldehyde without Lewis acid additive.
    Mots-clés : Anionic NHC, DFT calculations, MACO, NHC-borane, Pentacoordinated compounds, POLE 1, Silicon, Spirosilane.

  • H. Dossmann, L. Fontaine, T. Weisgerber, V. Bonnet, E. Monflier, A. Ponchel, et C. Przybylski, « First Steps to Rationalize Host–Guest Interaction between α-, β-, and γ-Cyclodextrin and Divalent First-Row Transition and Post-transition Metals (Subgroups VIIB, VIIIB, and IIB) », Inorganic Chemistry, vol. 60, nᵒ 2, p. 930-943, janv. 2021.
    Mots-clés : CSOB, Cyclodextrin, POLE 3.

  • Y. Fu, Y. Ding, L. Zhang, Y. Zhang, J. Liu, et P. Yu, « Poly ethylene glycol (PEG)-Related controllable and sustainable antidiabetic drug delivery systems », European Journal of Medicinal Chemistry, vol. 217, p. 113372, 2021.

  • D. Gatineau, H. Dossmann, H. Clavier, A. Memboeuf, L. Drahos, Y. Gimbert, et D. Lesage, « Ligand effects in gold-carbonyl complexes: evaluation of the bond dissociation energies using blackbody

    infrared radiative dissociation », International Journal of Mass Spectrometry, p. 116545, févr. 2021.

  • A. Gillet, S. Cher, M. Tassé, T. Blon, S. Alves, G. Izzet, B. Chaudret, A. Proust, P. Demont, F. Volatron, et S. Tricard, « Polarizability is a key parameter for molecular electronics », Nanoscale Horizons, vol. 6, nᵒ 3, p. 271-276, mars 2021.
    Résumé : Identifying descriptors that govern charge transport in molecular electronics is of prime importance for the elaboration of devices. The effects of molecule characteristics, such as size, bulkiness or charge, have been widely reported. Herein, we show that the molecule polarizability can be a crucial parameter to consider. To this end, platinum nanoparticle self-assemblies (PtNP SAs) are synthesized in solution, including a series of polyoxometalates (POMs). The charge of the POM unit can be modified according to the nature of the central heteroatom while keeping its size constant. POM hybrids that display remote terminal thiol functions strongly anchor the PtNP surface to form robust SAs. IV curves, recorded by conductive AFM, show a decrease in Coulomb blockade as the dielectric constant of the POMs increases. In this system, charge transport across molecular junctions can be interpreted as variations in polarizability, which is directly related to the dielectric constant.
    Mots-clés : E-POM, POLE 2.
    Pièce jointe Full Text PDF 2.7 Mo (source)

  • A. Harbi, Y. L. Godec, Y. Li, H. Moutaabbid, S. Benmokhtar, et M. Moutaabbid, « Experimental and theoretical investigation of the electronic, magnetic, and optical properties of a new oxyphosphate, Ni0.25Mn0.25TiO(PO4) », Journal of Physics and Chemistry of Solids, vol. 148, p. 109633, 2021.
    Résumé : The structural, magnetic, and optical properties of a new oxyphosphate, Ni0.25Mn0.25TiOPO4, have been investigated by X-ray diffraction (XRD) analysis, magnetic FC-ZFC measurements, and vibrational spectroscopy (Raman, IR, WDS, and UV/visible). XRD analysis showed that the compound crystallizes in a monoclinic structure, space group P21/c, with unit cell parameters of a = 7.3758(2) Å, b = 7.3255(2) Å, c = 7.3448(2) Å, and β = 120.25(2)°. Elemental analysis of the powder confirmed the presence of Ni, Mn, Ti, and P therein. Raman and IR spectra show strong bands at 749 and 787 cm−1, respectively, attributable to the vibration of –Ti–O–Ti–O– bonds in infinite chains. Magnetic studies have been performed in the temperature range from 2 to 300 K. The results revealed a weak antiferromagnetic coupling between spins in Ni0.25Mn0.25TiOPO4. The band-gap energy was estimated as Eg = 1.99 eV based on UV/Vis spectrophotometry. To better understand the experimental data, density functional theory (DFT) computations were performed within the generalized gradient approximation (GGA) and GGA + U. The partial density of states (PDOS) shows strong hybridization between O 2p, Mn 3d, and Ni 3d in the valence band and between Mn 3d, Ni 3d, and Ti 3d in the conduction band.
    Mots-clés : ERMMES, POLE 2.

  • X. He, Y. Nie, M. Zhong, S. Li, X. Li, Y. Guo, Z. Liu, Y. Gao, F. Ding, D. Wen, et Y. Zhang, « New organoselenides (NSAIDs-Se derivatives) as potential anticancer agents: Synthesis, biological evaluation and in silico calculations », European Journal of Medicinal Chemistry, vol. 218, p. 113384, 2021.

  • S. C. L. Kamerlin, D. J. Allen, B. de Bruin, E. Derat, et H. Urdal, « Journal Open Access and Plan S: Solving Problems or Shifting Burdens? », Development and Change, vol. n/a, nᵒ n/a, 2021.
    Résumé : This academic thought piece provides an overview of the history of, and current trends in, publishing practices in the scientific fields known to the authors (chemical sciences, social sciences and humanities), as well as a discussion of how open access mandates such as Plan S from cOAlition S will affect these practices. It begins by summarizing the evolution of scientific publishing, in particular how it was shaped by the learned societies, and highlights how important quality assurance and scientific management mechanisms are being challenged by the recent introduction of ever more stringent open access mandates. The authors then discuss the various reactions of the researcher community to the introduction of Plan S, and elucidate a number of concerns: that it will push researchers towards a pay-to-publish system which will inevitably create new divisions between those who can afford to get their research published and those who cannot; that it will disrupt collaboration between researchers on the different sides of cOAlition S funding; and that it will have an impact on academic freedom of research and publishing. The authors analyse the dissemination of, and responses to, an open letter distributed and signed in reaction to the introduction of Plan S, before concluding with some thoughts on the potential for evolution of open access in scientific publishing.
    Mots-clés : MACO, POLE 1.
    Pièce jointe Snapshot 648.7 ko (source)
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  • S. Khodjoyan, E. Remadna, H. Dossmann, D. Lesage, G. Gontard, J. Forté, H. Hoffmeister, U. Basu, I. Ott, P. Spence, Z. Waller, M. Salmain, et B. Bertrand, « [(C^C)Au(N^N)]+ complexes as a new family of anticancer candidates: synthesis, characterization and exploration of the antiproliferative properties », Chemistry – A European Journal, vol. n/a, nᵒ n/a, 2021.
    Résumé : A library of eleven cationic gold(III) complexes of the general formula [(C^C)Au(N^N)] + when C^C is either biphenyl or 4,4’-ditertbutyldiphenyl and N^N is a bipyridine, phenanthroline or dipyridylamine derivative have been synthesized and characterized. Contrasting effects on the viability of the triple negative breast cancer cells MDA-MB-231 was observed from a preliminary screening. The antiproliferative activity of the seven most active complexes were further assayed on a larger panel of human cancer cells as well as on non-cancerous cells for comparison. Two complexes stood out for being either highly active or highly selective. Eventually, reactivity studies with biologically meaningful amino acids, glutathione, higher order DNA structures and thioredoxin reductase (TrxR) revealed a markedly different behavior from that of the well-known coordinatively isomeric [(C^N^C)Au(NHC)] + structure. This makes the [(C^C)Au(N^N)] + complexes a new class of organogold compounds with an original mode of action.
    Mots-clés : Bioorganometallics, Biphenyl, Cancer, Chelate, CHEMBIO, CSOB, Gold, POLE 3.

  • G. Lemière, A. Millanvois, C. Ollivier, et L. Fensterbank, « A Parisian Vision of the Chemistry of Hypercoordinated Silicon Derivatives », The Chemical Record, vol. 21, nᵒ 5, p. 1119-1129, 2021.
    Résumé : Less than ten years of acquaintance with hypercoordinated silicon derivatives in our lab is described in this account. Martin's spirosilane derivatives open new opportunities as ligands and as agents for the activation of small molecules and bis-catecholato silicates have proven to be exquisite radical precursors in photoredox conditions for broad synthetic applications.
    Mots-clés : Lewis acid, MACO, photoredox, POLE 1, radical, silicate, Silicon.

  • A. Lepoetre, S. Ognier, M. Zhang, J. Wengler, S. Al Ayoubi, C. Ollivier, L. Fensterbank, X. Duten, et M. Tatoulian, « Amination of Cyclohexane by Dielectric Barrier Discharge Processing in a Continuous Flow Microreactor: Experimental and Simulation Studies », Plasma Chemistry and Plasma Processing, vol. 41, nᵒ 1, p. 351-368, 2021.
    Résumé : A miniaturized flow device has been developed to combine microfluidics technology and plasma process. In this microreactor, atmospheric pressure dielectric barrier discharges are generated in a gas in contact with a liquid phase. This study was conducted with plasma generated in ammonia in contact with a flow of liquid cyclohexane. Cyclohexylamine was synthesized with a good selectivity, and the process can be implemented to improve conversion and effectiveness. Numerical simulations confirmed that N­ H2 radicals are generated in the plasma and react with cyclohexyls radicals to achieve the reaction, giving a selectivity of 50% and a total molar conversion of 20% of cyclohexane. The effects of voltage and frequency on the selectivity and the experimental conversion rate were studied and discussed.
    Mots-clés : MACO, POLE 1.

  • A. Li, L. - M. Chamoreau, B. Baptiste, Y. Li, Y. Journaux, et L. Lisnard, « Solvothermal synthesis, structure and magnetic properties of heterometallic coordination polymers based on a phenolato-oxamato co-bidentate-tridentate ligand », Dalton Transactions, vol. 50, nᵒ 2, p. 681-688, janv. 2021.
    Résumé : The use of solvothermal conditions has succesfully led to the preparation of heterometallic 1D coordination polymers from a co-bidentate-tridentate phenolato-oxamato ligand. The reaction of the N-(2-hydoxyphenyl)oxamic acid (ohpma) with acetate salts of transition metal ions at 80 °C has yielded the heterobimetallic [Cu(ohpma)M(OAc)(DMF)2] (M = Co (1); Mn (2)) and the heterotrimetallic [Cu(ohpma)Co0.57Mn0.43(OAc)(DMF)2] (3) chain compounds. Single-crystal and powder diffraction studies show that the polymers are isostructural. Magnetic studies suggest the existence of an inter-chain two-dimensional antiferromagnetic interaction taking place in compounds 1–3.
    Mots-clés : ERMMES, POLE 2.

  • A. Li, L. - M. Chamoreau, B. Baptiste, Y. Li, Y. Journaux, et L. Lisnard, « Solvothermal synthesis, structure and magnetic properties of heterometallic coordination polymers based on a phenolato-oxamato co-bidentate-tridentate ligand », Dalton Transactions, vol. 50, nᵒ 2, p. 681-688, 2021.
    Résumé : First examples of 1D oxamate-based coordination polymers obtained solvothermally. , The use of solvothermal conditions has succesfully led to the preparation of heterometallic 1D coordination polymers from a co-bidentate-tridentate phenolato-oxamato ligand. The reaction of the N -(2-hydoxyphenyl)oxamic acid (ohpma) with acetate salts of transition metal ions at 80 °C has yielded the heterobimetallic [Cu(ohpma)M(OAc)(DMF) 2 ] (M = Co ( 1 ); Mn ( 2 )) and the heterotrimetallic [Cu(ohpma)Co 0.57 Mn 0.43 (OAc)(DMF) 2 ] ( 3 ) chain compounds. Single-crystal and powder diffraction studies show that the polymers are isostructural. Magnetic studies suggest the existence of an inter-chain two-dimensional antiferromagnetic interaction taking place in compounds 1–3 .

  • A. Li, J. Forté, Y. Li, Y. Journaux, et L. Lisnard, « Synthesis, structure and magnetic properties of an oxamate-based 1D coordination polymer built on pentametallic links », Inorganica Chimica Acta, vol. 521, p. 120320, juin 2021.
    Résumé : The solvothermal reaction of the hexadentate 2-(oxamato)benzoic acid ligand (oaba) with copper(II) and cobalt(II) ions has yielded the [Cu4Co3(oaba)4(OH)2(DMF)6]·2(DMF)·1H2O (1) 1D coordination polymer. The single-crystal X-ray diffraction study reveals the formation of a neutral chain built from pentametallic complexes where each multi-polydentate ligand bridges four metal centres. The atypical morphology observed here for an oxamate-based 1D polymer arises from the use of a ligand bearing extra coordination sites. Magnetometry indicates strong dominating antiferromagnetic interactions within the polymer resulting in a non-zero ferrimagnetic state at low temperature.
    Mots-clés : ERMMES, POLE 2.

  • J. Liu, X. Ding, Y. Fu, C. Xiang, Y. Yuan, Y. Zhang, et P. Yu, « Cyclodextrins based delivery systems for macro biomolecules », European Journal of Medicinal Chemistry, vol. 212, p. 113105, 2021.

  • J. Liu, B. Wang, C. Przybylski, O. Bistri‐Aslanoff, M. Ménand, Y. Zhang, et M. Sollogoub, « Programmed Synthesis of Hepta‐Differentiated β‐Cyclodextrin: 1 out of 117655 Arrangements », Angewandte Chemie International Edition, vol. 60, nᵒ 21, p. 12090-12096, mai 2021.
    Mots-clés : CSOB, GOBS, POLE 3.

  • S. Mabrouk, H. Rinnert, L. Balan, S. Blanchard, J. Jasniewski, G. Medjahdi, R. B. Chaabane, et R. Schneider, « Aqueous synthesis of highly luminescent ternary alloyed Mn-doped ZnSeS quantum dots capped with 2-mercaptopropionic acid », Journal of Alloys and Compounds, vol. 858, p. 158315, mars 2021.
    Résumé : Highly photoluminescent and water dispersible ternary alloyed Mn-doped ZnSeS and core/shell Mn:ZnSeS/ZnS quantum dots (QDs) with pure dopant emission were synthesized through a simple aqueous route using thiolactic acid (2-MPA) as a capping ligand. Transmission electron microscopy and X-ray diffraction show that Mn:ZnSeS nanocrystals are of spherical shape, with a diameter of 2.4 nm and a cubic zinc blende structure. With the overcoating of the ZnS shell, the particle size increases to 3.7 nm, which confirms the epitaxial growth of the shell on Mn:ZnSeS cores. The photoluminescence (PL) quantum yield depends on the Mn loading and reaches 22% for Mn:ZnSeS cores doped with 10% Mn and 41% after the growth of ZnS at the surface of the cores due to the effective elimination of surface-trap states. Mn:ZnSeS QDs exhibit also long PL lifetimes (up to 681 μs) indicating that the emission originates from the spin forbidden Mn2+ 4T1 → 6A1 transition. Electron paramagnetic resonance and X-ray photoelectron spectroscopy results suggest that Mn2+ ions are located at the interface of core/shell Mn:ZnSeS/ZnS QDs. Further, the stability of Mn:ZnSeS/ZnS QDs was also investigated along with their transfer in organic phase using octanethiol.
    Mots-clés : 2-Mercaptopropionic acid, Core/shell Mn:ZnSeS/ZnS, E-POM, Mn-doped ZnSeS, Photoluminescence, POLE 2, Quantum dots, Stability.

  • J. - P. Mahy, F. Avenier, W. Ghattas, R. Ricoux, et M. Salmain, « Current Applications of Artificial Metalloenzymes and Future Developments », in Enzymes for Solving Humankind's Problems: Natural and Artificial Systems in Health, Agriculture, Environment and Energy, J. J. G. Moura, I. Moura, et L. B. Maia, Éd. Cham: Springer International Publishing, 2021, p. 363-411.
    Résumé : In between traditional homogeneous metal catalysts and enzyme catalysts, a new class of hybrid catalysts named artificial metalloenzymes resulting from the controlled embedding of transition metal species (ions, synthetic inorganic or organometallic complexes) within natural, genetically-engineered or even de novo protein scaffolds currently undergoes a tremendous development at the academic level. This family of hybrid assemblies ideally combines the features of their individual components, allowing a wide range of chemical reactions, including new-to-nature reactions, to be catalyzed under mild, eco-compatible conditions with high chemo- and/or stereoselectivity. This chapter intends to summarize the most remarkable achievements in artificial metalloenzyme design and properties with emphasis put on industrially relevant chemical reactions, including oxidations, imine reductions, C–C and C–N bonds formation. It also gives an up-to-date survey on the most advanced applications of artificial metalloenzymes in cascade reactions and in vivo catalysis.
    Mots-clés : Carbene insertion, Cascade reactions, CHEMBIO, Directed evolution, In vivo catalysis, Metathesis, Oxidation, POLE 3, Polymerization, Reduction, Uncaging.

  • T. Martinez, A. Vanitcha, C. Troufflard, N. Vanthuyne, J. Forté, G. Gontard, G. Lemière, V. Mouriès-Mansuy, et L. Fensterbank, « Indolizy Carbene Ligand. Evaluation of Electronic Properties and Applications in Asymmetric Gold(I) Catalysis », Angewandte Chemie International Edition, vol. 60, nᵒ 36, p. 19879-19888, 2021.
    Résumé : We report herein a new family of carbene ligands based on an indolizine-ylidene (Indolizy) moiety. The corresponding gold(I) complexes are easily obtained from the gold(I)-promoted cyclization of allenylpyridine precursors. Evaluation of the electronic properties by experimental methods and also by DFT calculations confirms strong σ-donating and π-accepting properties of these ligands. Cationization of the gold(I) complexes generates catalytic species that trigger diverse reactions of (poly)unsaturated precursors. When armed with a methylene phosphine oxide moiety on the stereogenic center adjacent to the nitrogen atom, the corresponding bifunctional carbene ligands give rise to highly enantioselective heterocyclizations. DFT calculations brought some rationalization and highlighted the critical roles played by the phosphine oxide group and the tosylate anion in the asymmetric cyclization of γ-allenols.
    Mots-clés : asymmetric catalysis, carbene, DFT, gold, MACO, phosphine oxide, POLE 1.

  • Y. Mazouzi, A. Miche, A. Loiseau, B. Beito, C. Méthivier, D. Knopp, M. Salmain, et S. Boujday, « Design and Analytical Performances of a Diclofenac Biosensor for Water Resources Monitoring », ACS sensors, août 2021.
    Résumé : Because the broadly consumed pain killer diclofenac (DCF) is a recognized pollutant, monitoring of its concentration is routinely performed in surface waters. As a valuable alternative to chromatographic and immunochemical assays, we developed a piezoelectric immunosensor to quantify DCF, first in buffer (PBS) and then in river water samples. A sensing layer comprising DCF was built up on the surface of silica-coated quartz sensors using a robust coupling chemistry. Binding of a highly affine monoclonal anti-DCF antibody was monitored in real time by quartz crystal microbalance with dissipation (QCM-D) measurements from which were determined a dissociation constant KD of 0.24 nM and an acoustic antibody surface coverage of 1120 ng/cm2 at saturation. On the other hand, an optical antibody surface coverage of 260 ng/cm2 was determined by combined nanoplasmonic sensing measurement, giving a hydration percentage of 75% for the antibody monolayer. DCF assay was further set up following a competitive format for which binding of antibody to the sensing layer is inhibited by DCF in solution. The piezoelectric sensor response expressed as frequency shift ΔF was inversely related to the concentration of DCF with a dynamic range of 15-46 nM and a limit of detection (LoD) of 9.5 nM (2.8 μg/L) in PBS. This piezoelectric immunosensor was eventually applied to the assay of DCF in surface water samples taken at three different locations in the Seine and Marne rivers. The calculated concentration of DCF in these samples was in good agreement with official data published by the French center of water analysis eaufrance.
    Mots-clés : antibody, CHEMBIO, immunosensor, nanoplasmonics, nonsteroidal anti-inflammatory drug, POLE 3, quartz crystal microbalance.

  • C. Medena, C. Aubert, E. Derat, L. Fensterbank, G. Gontard, O. Khaled, C. Ollivier, N. Vanthuyne, M. Petit, et M. Barbazanges, « Helical Bisphosphinites in Asymmetric Tsuji-Trost Allylation: a Remarkable P:Pd Ratio Effect », ChemCatChem, vol. 13, nᵒ 21, p. 4543-4548, 2021.
    Résumé : This article discloses a study on a chiral bis-phosphorylated-helical ligand in the palladium-catalyzed Tsuji-Trost allylation. The use of 2,15-bisphosphinite-[6]-helicenes revealed a remarkable ligand effect, in which the (R) and (S) isomeric products can be selectively formed as a direct function of the amount of ligand introduced. Investigation of the organometallic species involved through 31P NMR spectroscopic analysis of a model complex and X-Ray diffraction analysis together with DFT calculations shed light on this phenomenon.
    Mots-clés : chirality, helicene, homogeneous catalysis, MACO, phosphinite, POLE 1, Tsuji-Trost allylation.

  • G. Mellot, J. - M. Guigner, J. Jestin, L. Bouteiller, F. Stoffelbach, et J. Rieger, « Unexpected thermo-responsiveness of bisurea-functionalized hydrophilic polymers in water », Journal of Colloid and Interface Science, vol. 581, p. 874-883, janv. 2021.
    Résumé : Hypothesis Thermoresponsive polymers are important materials for various applications. However, the number of polymers that exhibit this property in the temperature range of interest remains limited. The development of novel rational design strategies through the understanding of the thermal transition’s origin is therefore of utmost importance. Experiments Bisurea-functionalized water-soluble polymers were synthesized by RAFT polymerization. After direct dissolution in water, the supramolecular assemblies were analyzed by cryo-TEM and SANS. Their temperature-dependent water-solubility was characterized by various techniques, namely DLS, SANS, DSC, IR, to understand the origin of the temperature sensitivity. Findings The supramolecular assemblies exhibit an unexpected temperature-dependent solubility. For instance, a cloud point of only 39 °C was measured for poly(N,N-dimethylacrylamide) assemblies. This property is not restricted to one specific polymer but is rather a general feature of bisurea-functionalized polymers that form supramacromolecular bottlebrushes in water. The results highlight the existence of two distinct transitions; the first one is a visually perceptible cloud point due to the aggregation of individual micelles, presumably driven by the hydrophobic effect. The second transition is related to the dissociation of intermolecular bisurea hydrogen bonds. Finally, we show that it is possible to widely tune the cloud point temperature through the formation of co-assemblies.
    Mots-clés : Bisurea, Cloud point, Cylindrical micelles, Hydrogen bonding, LCST, nano-DSC, POLE 4, POLYMERES, Supramacromolecular assemblies, Supramolecular bottlebrushes, Thermoresponsive.

  • S. Nasri, M. Hajji, M. Guergueb, S. Dhifaoui, V. Marvaud, F. Loiseau, F. Molton, T. Roisnel, T. Guerfel, et H. Nasri, « Spectroscopic, Electrochemical, Magnetic and Structural Characterization of an Hexamethylenetetramine Co(II) Porphyrin Complex – Application in the Catalytic Degradation of Vat Yellow 1 dye », Journal of Molecular Structure, vol. 1231, p. 129676, 2021.

  • B. Neil, F. Lucien, L. Fensterbank, et C. Chauvier, « Transition-Metal-Free Silylation of Unactivated C(sp2)–H Bonds with tert-Butyl-Substituted Silyldiazenes », ACS Catalysis, vol. 11, nᵒ 21, p. 13085-13090, nov. 2021.
    Résumé : Aromatic organosilanes bearing C(sp2)–Si bonds have found increasing applications across the chemical science, yet are mostly produced by atom-uneconomical stoichiometric procedures. Catalytic alternatives using hydrosilanes as silicon sources have also been described, but they display unfavorable thermodynamics and are mostly based on expensive catalytic systems, often derived from noble metals, or lack generality. Herein, we describe the use of an alternative silicon source, namely the tert-butyl-substituted silyldiazenes (tBu–N═N–SiR3), that are readily accessible from commercially available precursors and whose structure enables the C(sp2)–H bond silylation of unactivated heteroaryl and aryl compounds under ambient, transition-metal-free catalytic conditions.
    Mots-clés : MACO, POLE 1.

  • B. Neil, F. Lucien, L. Fensterbank, et C. Chauvier, « Transition-Metal-Free Silylation of Unactivated C(sp2)–H Bonds with tert-Butyl-Substituted Silyldiazenes », ACS Catalysis, vol. 11, nᵒ 21, p. 13085-13090, nov. 2021.
    Résumé : Aromatic organosilanes bearing C(sp2)–Si bonds have found increasing applications across the chemical science, yet are mostly produced by atom-uneconomical stoichiometric procedures. Catalytic alternatives using hydrosilanes as silicon sources have also been described, but they display unfavorable thermodynamics and are mostly based on expensive catalytic systems, often derived from noble metals, or lack generality. Herein, we describe the use of an alternative silicon source, namely the tert-butyl-substituted silyldiazenes (tBu–N═N–SiR3), that are readily accessible from commercially available precursors and whose structure enables the C(sp2)–H bond silylation of unactivated heteroaryl and aryl compounds under ambient, transition-metal-free catalytic conditions.

  • C. Passirani, A. Vessières, G. La Regina, W. Link, et R. Silvestri, « Modulating undruggable targets to overcome cancer therapy resistance », Drug Resistance Updates, p. 100788, déc. 2021.
    Résumé : Many cancer patients frequently fail to respond to anti-cancer treatment due to therapy resistance which is the major obstacle towards curative cancer treatment. Therefore, identification of the molecular mechanisms underlying resistance is of paramount clinical and economic importance. The advent of targeted therapies based on a molecular understanding of cancer could serve as a model for strategies to overcome drug resistance. Accordingly, the identification and validation of proteins critically involved in resistance mechanisms represent a path towards innovative therapeutic strategies to improve the clinical outcome of cancer patients. In this review, we discuss emerging targets, small molecule therapeutics and drug delivery strategies to overcome therapy resistance. We focus on rational treatment strategies based on transcription factors, pseudokinases, nuclear export receptors and immunogenic cell death strategy. Historically, unliganded transcription factors and pseudokinases were considered undruggable while blocking the nuclear export e.g., through inhibition of the nuclear export receptor CRM1 was predicted as highly toxic. Recent success inhibiting Gli-1, HIF-1α, HIF-2α and reactivating the tumor suppressor transcription factors p53 and FOXO illustrates the feasibility and power of this targeting approach. Similarly, progress has been made in modulating the activity of pseudokinase proteins implicated in therapy resistance including members of the Tribbles protein family. On the other hand, the recent clinical approval of Selinexor, a specific inhibitor of CRM-1, a protein that mediates the transport of cargos with leucine-rich nuclear export signals and known to be a driver of drug resistance, represents the proof-of-concept for inhibiting the nuclear export as a feasible strategy to overcome therapy resistance. The ever-growing capacity to target resistance mechanisms with judiciously selected small molecules, some of which are being formulated within smart nanoparticles, will pave the way towards the improvement of the clinical outcome and realize the full potential of targeted therapies and immunotherapies.
    Mots-clés : Cancer, CHEMBIO, drug development, drug resistance, nanomedicine, POLE 3, therapeutic targets.

  • G. Passos Gomes, G. Xu, X. Zhu, L. ‐M. Chamoreau, Y. Zhang, O. Bistri‐Aslanoff, S. Roland, I. V. Alabugin, et M. Sollogoub, « Mapping C−H⋅⋅⋅M Interactions in Confined Spaces: (α‐ICyD <sup>Me</sup> )Au, Ag, Cu Complexes Reveal “Contra‐electrostatic H Bonds” Masquerading as Anagostic Interactions** », Chemistry – A European Journal, p. chem.202100263, mai 2021.

  • V. Pellas, J. Blanchard, C. Guibert, J. - M. Krafft, A. Miche, M. Salmain, et S. Boujday, « Gold Nanorod Coating with Silica Shells Having Controlled Thickness and Oriented Porosity: Tailoring the Shells for Biosensing », ACS Applied Nano Materials, août 2021.
    Résumé : The coating of gold nanorods with a silica shell (AuNR@SiO2) is an effective way to extend their use in a wide variety of biomedical applications including biosensing, drug delivery and photothermal therapy. A silica shell offers numerous advantages as it provides more stability, frees the surface from toxic cetyltrimethylammonium bromide (CTAB), and preserves the rod shape under photothermal conditions. This shell needs to be very thin for applications such as plasmonic biosensing, while a thicker and porous shell is suited for drug encapsulation and further controlled release. We introduce herein a strategy to perform silica coating based on dissociation of tetraethylorthosilicate (TEOS) hydrolysis and condensation reactions. This dissociation is achieved by a pH modulation of the reaction medium, and, depending on selected pH conditions, AuNR@SiO2 with a thick silica shell having an organized mesoporosity aligned either parallel (AuNR@//m-SiO2) or perpendicular (AuNR@⊥m-SiO2) to the AuNR surface was generated. Moreover, when mercaptopropyltrimethoxysilane (MPTMS) was used as a surface primer prior to TEOS condensation, ultrathin and homogeneous silica shells (AuNR@t-SiO2) of controllable thickness in the range 2–6 nm were produced. While formation, at high TEOS concentration, of core-free silica nanoparticles is evidenced by TEM analysis before the purification procedure, their total elimination during the purification step was achieved by addition of a suitable amount of CTAB to ensure the colloidal stability of the core-free and core–shell nanoparticles. Complete elimination of CTAB from AuNR@SiO2 was demonstrated by XPS, Raman, and ζ-potential measurements. Finally, the efficiency of AuNR@t-SiO2 in label-free plasmonic biosensing of a model target was demonstrated and their refractive index sensitivity factor was improved by 30% compared to CTAB-capped AuNRs.
    Mots-clés : CHEMBIO, POLE 3.

  • C. Przybylski et V. Bonnet, « Discrimination of isomeric trisaccharides and their relative quantification in honeys using trapped ion mobility spectrometry », Food Chemistry, vol. 341, p. 128182, 2021.

  • J. P. Rada, J. Forté, G. Gontard, C. - M. Bachelet, N. A. Rey, M. Salmain, et V. Corcé, « Novel luminescent benzopyranothiophene- and BODIPY-derived aroylhydrazonic ligands and their dicopper(II) complexes: syntheses, antiproliferative activity and cellular uptake studies », Journal of biological inorganic chemistry: JBIC: a publication of the Society of Biological Inorganic Chemistry, vol. 26, nᵒ 6, p. 675-688, sept. 2021.
    Résumé : Two novel unsymmetrical binucleating aroylhydrazonic ligands and four dicopper(II) complexes carrying fluorescent benzopyranothiophene (BPT) or boron dipyrromethene (BODIPY) entities were synthesized and fully characterized. Complex 1, derived from the BPT-containing ligand H3L1, had its crystal structure elucidated through X-ray diffraction measurements. The absorption and fluorescence profiles of all the compounds obtained were discussed. Additionally, the stability of the ligands and complexes was monitored by UV-vis spectroscopy in DMSO and biologically relevant media. All the compounds showed moderate to high cytotoxicity towards the triple negative human breast cancer cell line MDA-MB-231. BPT derivatives were the most cytotoxic, specially H3L1, reaching an IC50 value up to the nanomolar range. Finally, fluorescence microscopy imaging studies employing mitochondria- and nucleus-staining dyes showed that the BODIPY-carrying ligand H3L2 was highly cell permeant and suggested that the compound preferentially accumulates in the mitochondria.
    Mots-clés : Anticancer agents, Aroylhydrazones, Cellular uptake, CHEMBIO, Copper complexes, Cytotoxicity, POLE 3.

  • R. Ramos, J. - F. Gilles, R. Morichon, C. Przybylski, B. Caron, C. Botuha, A. Karaiskou, M. Salmain, et J. Sobczak-Thépot, « Cytotoxic BODIPY-Appended Half-Sandwich Iridium(III) Complex Forms Protein Adducts and Induces ER Stress », Journal of Medicinal Chemistry, vol. 64, nᵒ 22, p. 16675-16686, nov. 2021.
    Résumé : Half-sandwich complexes of iridium(III) are currently being developed as anticancer drug candidates. In this context, we introduce IrBDP for which the C^N chelating phenyloxazoline ligand carries a fluorescent and lipophilic BODIPY reporter group, designed for intracellular tracking and hydrophobic compartment tropism. High-resolution analysis of cells cultured with IrBDP showed that it quickly permeates the plasma membrane and accumulates in the mitochondria and endoplasmic reticulum (ER), generating ER stress, dispersal of the Golgi apparatus, cell proliferation arrest and apoptotic cell death. Moreover, IrBDP forms fluorescent adducts with a subset of amino acids, namely histidine and cysteine, via coordination of N or S donor atoms of their side chains. Consistently, in vivo formation of covalent adducts with specific proteins is demonstrated, providing a molecular basis for the observed cytotoxicity and cellular response. Collectively, these results provide a new entry to the development of half-sandwich iridium-based anticancer drugs.
    Mots-clés : CHEMBIO, POLE 3.
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