Добірка наукової літератури з теми "Pyrroles – Synthèse (chimie)"
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Дисертації з теми "Pyrroles – Synthèse (chimie)":
Naud, Sébastien. "Synthèse de dérivés pyrroliques par régression de cycles pyridaziniques : application à la synthèse de nouveaux C-nucléosides pyrroliques, tétrahydro-pyranopyrroles et pyrrolo-dihydroquinoléinones : nouvelle voie de synthèse vers des analogues d' indolines tricycliques à visée thérapeutique." Nantes, 2006. http://www.theses.fr/2006NANT2035.
This thesis highlights the synthesis of new pyrrole derivatives by using ring contraction of pyridazines. This methodology was first combined with carbohydrate chemistry and thus, we got new pyrrole C-nucleosides in ribofuranose and deoxyribofuranose series. We also synthesized different pyrano-pyrroles, compounds owning a pyrrole ring fused to an -pyrone, showing potential biological activities. This pyrrole synthesis was also employed to allow the access to new dihydroquinolinones. The different steps to synthesize a key pyridazinic intermediate are described in this manuscript. Some tricyclic indolines with promising biological activities were at last prepared according to a short and efficient synthetic plan
Khatimi, Nadia. "Synthèse d'hétérocycles substitués par un groupe trifluorométhyle (isoxazoles, aziridines, thiophènes, pyrroles)." Lyon 1, 1996. http://www.theses.fr/1996LYO10177.
Tabatchnik-Rebillon, Alexandra. "Synthèse de dérivés pyrroliques par régression de cycles et applications biologiques." Nantes, 2009. http://www.theses.fr/2009NANT2102.
For many years, our team has been particularly interested in the electrochemical reduction of monopyridazines into monopyrroles. This original and smooth methodology allows the access to monopyrrolic compounds, by extrusion of a nitrogen atom from the correspondent pyridazinic precursor. During the course of this thesis, we made the most of this strategy for synthesizing bipyrrolic chains from bipyridazinic precursors. Except for the synthetic challenge represented by those two families of polyazaheterocycles, their interest lays in their numerous potential applications in fields like biology or supramolecular chemistry. Two series of bipyrrolic structures were therefore studied :The a a'-bipyrrolic series, called linear, in which pyrrolic systems are directly linked to each other The bipyrrolic series, called alternate, in which pyrrolic units are linked by a spacer, like a pyridine Each series of compound ends by a pyridyl functionali sewith one more methyl groups. For each targeted compound, our study took place in the following order :I Preparation of « linear and alternate » bipyridazinic precursors II – Study of their reduction into the correspondent bipyrrolic derivative by an electrochemical way III Experimental and theoretical study of the conformations of the two kinds of families and their preferred complexation sites IV Evaluation of their potential for biological applications and a supramolecular perspective
Desvergnes, Valérie. "Addition 1,2 du méthoxyallène lithié sur les hydrazones : aspects synthétique et mécanistique." Lyon 1, 1999. http://www.theses.fr/1999LYO10320.
Bouteau, Brigitte. "Synthèse et étude physicochimique de pyrrolyl-pyridines, pyrido (2,3-c) pyrrolo (1,2-e) triazépines-1,2,5, triazolo-1,2,4 (4,5-a) pyridines, triazolo (1,2,4) (2,3-a) pyridines." Caen, 1989. http://www.theses.fr/1989CAEN4051.
Berini, Christophe. "Réaction des nitrones avec des pyrroles : accès à des N-hydroxylamines chirales. Applications à la synthèse d'acides alpha aminés." Université Joseph Fourier (Grenoble), 2008. http://www.theses.fr/2008GRE10102.
The chemistry of pyrrole and its derivatives is of great interest due to their abundance in many natural and biologically active compounds. The development of new methods to access to functionalized heterocyclic compounds is therefore a promising area. In this context, we have developed a method, in which pyrroles are added onto nitrones in the presence of hydrogen chloride. According to the experimental procedure, either pyrrolic N benzylhydroxylamines or 2,2’ bispyrrolylalkanes could be selectively and efficiently produced. In order to obtain chiral pyrrolic N benzylhydroxylamines, a stereoselective version of this reaction has been developed. Asymmetric inductions from chiral nitrones allow the access to pyrrolic N hydroxylamines with high levels of diastereoselectivities and good yields. The use of a glyoxylate based cyclic chiral nitrone leads to two enantio‐enriched non natural alpha amino acids, the 2’ and 3’ pyrrolylglycines in 22% and 50% overall yield respectively. Moreover, this method has been successfully applied to the total synthesis of Penmacric Acid, a natural product isolated from the seeds of Pentaclethra macrophylla, a leguminous tree, in 11 steps and 17% overall yield. Finally, the results of several biological assays have been performed. The properties as inhibitory of NorA efflux pump and anti‐angiogenic, as well as the activity on the microtubular cytoskeleton are presented
Declerck, Valérie. "β-aminoesters insaturés obtenus par réaction d'Aza-Baylis–Hillman : des synthons multifonctionnels pour la synthèse d'hétérocycles originaux". Montpellier 2, 2006. http://www.theses.fr/2006MON20024.
This work was dedicated to the synthesis of original heterocyclic structures starting from Beta-aminoesters obtained via the multicomponent aza-Baylis–Hillman reaction. First of all, we have developed new conditions for the aza-Baylis–Hillman of trimethylsilylethanesulfonamide (SES–NH2), methyl acrylate and an aromatic aldehyde. This methode allowed us the preparation of a large variety of unsaturated Beta-aminoesters. These unsaturated Beta-aminoesters are multifunctional synthons for the preparation of heterocyclic structures. We have prepared five membered ring heterocycles by ring closing metathesis. The different deprotection conditions of the SES group (dehydrodesulfinyaltion and Beta-elimination) allowed the synthesis of pyrroles, pyrrolidines and pyrrolines from the same cyclic precursor. We have also prepared triazolodiazepines by the Huisgen reaction and benzazepines by the Heck reaction under microwave activation
Bouyazza, Lahboub. "Synthèse et étude physicochimique des 9H-pyrrolo (1,2-A) indoliminiums-9, 9H-pyrrolo (1,2-A) indolimines-9, 9H-pyrrolo (1,2-A) indoles-9, pyrrolo (1,2-A) quinoléines." Caen, 1989. http://www.theses.fr/1989CAEN4022.
Murat-Onana, Marie Laure. "N-hydroxylamines pyrroliques : precurseurs de bis(pyrrolyl)alcanes non symetriques et de α-n-hydroxyamino esters". Grenoble, 2010. http://www.theses.fr/2010GRENV060.
The pyrrole ring is present in many natural and biologically active compounds. Therefore, its intensive study in organic synthesis is of a great interest. Thus, the first acid-catalyzed reaction of pyrroles onto nitrones was reported by our team. According to the experimental procedure, either pyrrolic Nbenzylhydroxylamines or 2,2'-bis(pyrrolyl)alkanes were selectively produced. Pyrrolic Nhydroxylamines are important compounds and have been used as starting building blocks for the two methodologies described in this manuscript. Unsymmetrical bis(pyrrolyl)alkanes were obtained efficiently in one step, with high molecular diversity, by the reaction of pyrrolic N-hydroxylamines and various pyrroles. This method also allowed the preparation of symmetrical and unsymmetrical tripyrromethanes. Our results were applied to the preparation of unsymmetrical F-Bodipy® probes. They were obtained, in high yields and for the first time, directly from unsymmetrical 2,2'-bis(pyrrolyl)alkanes. Moreover, an axially chiral F-Bodipy® has been prepared. A-N-Hydroxyamino acids which are N-hydroxylated analogues of a-amino acids have been synthesized. A highly diastereoselective reaction between pyrrole and a suitable cyclic chiral nitrone yielded a pyrrolic N-hydroxylamine. A three-step sequence afforded the expected a-N-hydroxyamino ester in a good yield and a good enantiomeric excess (80%). This method has been applied to other pyrrolic, indolic and furanic heteroaromatics. No a-N-hydroxyamino acids holding these heterocycles in their structures were described. Good overall yields (36-62%) were obtained and good enantiomeric excesses, up to 98%
Guieu, Benjamin. "Synthèse de pyrroles polysubstitués par cyclisation à l'or : évaluation de l'activité de 3-arylpyrroles sur les microtubules." Thesis, Rennes 1, 2017. http://www.theses.fr/2017REN1S084/document.
A family of 3-arylpyrroles named pyakols have shown antimitotic properties on murine cell lines, displaying in particular an effect on microtubules. Given the interest of these properties in cancerology, this work is focused on these heterocycles. The objective of the first part was to develop a synthetic strategy based on the gold-catalysed cyclisation of α-amino-ynols intermediates in order to access the lead (Pyakol I). Then, the evaluation of the biological activity of this molecule on the cell cycle and on the cytoskeleton of various human tumoral cell lines was carried out. The first results revealed an original effect on the organization of the microtubules network and the positioning of the mitotic spindle. The developed strategy was then validated by modulating the 3-arylpyrrole moiety on diverse positions, and used for the synthesis of labelled derivatives. The second part of this manuscript focused on the development of a methodology to synthesize new polysubstituted 3-trifluoromethylpyrroles, based on the gold-catalyzed cyclisation reaction. Using trifluoroacetaldehyde as building-block, various trifluoromethylated pyrroles were obtained in mild conditions with good yields