Abstract Upon treatment with TBAF, CF3-substituted N-allenamides were transformed into γ-sultams. Cyclic sulfonamides bearing an ene-gem-difluorinated tether could be obtained by addition of acetic acid to the ammonium salt whereas TBAF alone provided the correspondingtrifluorinated ethyl sultams. A combined experimental and computationnal mechanistic study suggested that this transformation...[En savoir plus]
Abstract Cu chelation in biological systems is of interest as a tool to study the metabolism of this essential metal or for applications in the case of diseases with a systemic or local Cu overload, such as Wilson's or Alzheimer's disease. The choice of the chelating agent must meet several criteria. Among others, affinities and kinetics of metal binding and related metal selectivity are...[En savoir plus]
Abstract Copper (Cu) is essential for most organisms, but it can be poisonous in excess, through mechanisms such as protein aggregation, trans-metallation and oxidative stress. Latter could implicate the formation of potentially harmful Reactive Oxygen Species (ROS: O2•–, H2O2 and HO•) via the redox cycling between Cu(II)/Cu(I) states in the presence of dioxygen and physiological reducing agents...[En savoir plus]
Vendredi 30 juin à 14h00 dans l'Amphi Alain BERETZ (Nouveau Patio) sur le campus d'Esplanade. Titre : "Conception de navettes peptidique sélectives au cuivre afin de prévenir la toxicité du complexe Cu-amyloïde-β lié à la maladie d'Alzheimer" Cette thèse a été effectuée sous la direction du Prof. Peter Faller (équipe BCB, UMR 7177, Institut de Chimie de Strasbourg) et du Dr. Nicolas Vitale...[En savoir plus]
Vendredi 30 juin à 14h00 dans l'Amphi 2 à l'Institut Le Bel sur le campus d'Esplanade. Titre : "(Co)-polymérisation par ouverture de cycle d'anhydrides, d'époxydes ou de lactones biosourcés en présence d'organocatalyseur pour la synthèse de polyesters ou de polyéthers" Cette thèse a été effectuée sous la direction du Dr. Samuel Dagorne (équipe Synthèse, Réactivité et Catalyse...[En savoir plus]
Abstract In the field of noncovalent interactions, chalcogen bonding (ChB) involving the tellurium atom is currently attracting much attention in supramolecular chemistry and in catalysis. However, as a prerequisite for its application, the ChB should be studied in solution to assess its formation and, if possible, to evaluate its strength. In this context, new tellurium derivatives bearing CH2F...[En savoir plus]
Abstract Telluronium salts bearing electron-withdrawing groups were prepared, and their ability to drive chalcogen bonds with ketones and imines was demonstrated in the solid state and in solution. These strong σ-hole bond donors were able to efficiently catalyze the Povarov reaction through chalcogen bond activation of imines and subsequent reaction with alkenes. The title reaction was found to...[En savoir plus]