Letteratura scientifica selezionata sul tema "Lactones – Synthèse (chimie)"
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Tesi sul tema "Lactones – Synthèse (chimie)":
Carrière, Anne. "Cyclisations tandem de radicaux alpha-alcoxycarbonyle, alpha-carbamoyle et alpha-carbonyle : application à la synthèse de composés bicycliques". Aix-Marseille 3, 1994. http://www.theses.fr/1994AIX30084.
Moustrou, Corinne. "Synthèses de [gamma]-lactones par cyclisation oxydante de [bêta]-diesters sous l'action du triacétate de manganèse". Aix-Marseille 3, 1991. http://www.theses.fr/1991AIX30062.
Le, Lamer Anne-Cécile. "α-méthylène-γ-lactones lichéniques : extraction, isolement et synthèse d'analogues". Rennes 1, 2006. http://www.theses.fr/2006REN1S092.
Fournier, Lycia. "Etude expérimentale et théorique de la translactonisation de β-lactones. Applications en synthèse totale de produits naturels". Aix-Marseille 3, 2004. http://www.theses.fr/2004AIX30009.
The [alpha],β-unsaturated or β-hydroxy [delta]-lactone moieties are present in a number of natural products of biological importance. Among these, callystatin A has attracted special interest because of its activities against tumoral cells. Thus, the preparation of these moieties is one of the key-steps of the synthesis of these natural products. Our aim was to propose a new and efficient method for the preparation of [alpha],β-unsaturated or β-hydroxy lactones from β-lactones. The translactonization of silylated β-lactones into [alpha],β-unsaturated [delta]-lactones and of desilylated β-lactones into β-hydroxy [delta]-lactones was optimised and applied to the total synthesis of natural products : (±)-prelactone B, (-)-massoialactone, (±)-goniothalamin, (+)-argentilactone. Side by side with our experimental work we have also carried out a theoretical study in order to get a better understanding. Finally, a preliminary study of the synthesis of callystatin A is reported
Halvorsen, Karin. "Chimie macrocyclique. Nouvelle stratégie sans haute dilution : macrolactonisation et macrolactamisation en milieu organisé". Toulouse 3, 1992. http://www.theses.fr/1992TOU30024.
Pommier, Agnès. "Formation de bêta-lactones par cycloaddition [2+2] : étude de la réaction et application à la synthèse de la (-)-lipstatine". Aix-Marseille 3, 1994. http://www.theses.fr/1994AIX30033.
Guerrab, Zineb. "Synthèse d'analogues d'iridolactones et iridolactames optiquement actifs". Lyon 1, 2003. http://www.theses.fr/2003LYO10217.
Michaut, Mathieu. "Réactions de métathèse catalysée par le ruthénium, application à la synthèse de divinylcétones et de spirolactones : Mathieu Michaut". Aix-Marseille 3, 2001. http://www.theses.fr/2001AIX30060.
In the past decade, since the discovery of a novel ruthenium and molybdenium carbene species by Grubbs and Schrock, the organic chemist attention increased toward metathesis reaction. Particularly, ruthenium catalysts were found to be moisture and air stable, very efficient, and tolerant with a lot of functional groups. In the first part, a new approach to prepare divinylketones was investigated via a ring opening cross metathesis reaction, using terminal olefins and cyclopropenone derivatives. For example, with allyltrimethlsilane, despite the numerous possibilities, the reaction exhibited very high selectivity affording to new functional allylsilane. .
Bressy, Cyril. "Réactions tandem métathèse et processus radicalaires : application à la synthèse de lactones et de lactames d'importance biologique". Lyon 1, 2004. http://www.theses.fr/2004LYO10002.
Legrand, Frédéric. "Synthèses totales de deux analogues de la Bréfeldine A : la 15-nor-Me-BFA et la 4-epi-15-nor-Me-BFA". Nantes, 2008. http://www.theses.fr/2008NANT2041.
Brefeldin A (BFA) is a macrocyclic lactone first isolated from Penicillium decumbens in 1958. Early studies showed that BFA exhibits a wide range of biological activities including the inhibition of proteins transport from the endoplasmic reticulum to the Golgi apparatus. BFA acts in a specific and unusual manner following an interfacial inhibition process (BFA recognizes both a small G protein and its protein effector) that could inspired new conceptions for drug design. The utility of BFA is hampered however by its toxicity so that the synthesis of active, but less toxic, analogues, is highly desirable. We report herein on the total synthesis of 15-nor-Me-BFA along with its C4 epimer (4-epi-15-nor-Me-BFA) following a strategy that was previously developed in our laboratory for the synthesis of BFC, the non-hydroxylated analogue of BFA at carbon C7. These two analogues have been prepared in 24 steps in a 2. 9 % overall yield. The results of biochemical tests, realized on both BFA and its synthetic analogues, have allowed us to better understand the mode of action of these bicyclic macrolactones