Dissertations / Theses on the topic 'Cycloisomérisation'
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Moukhliss, Maâti. "Synthèse de pyrazoles chiraux à squelette pinanique et cycloisomérisation catalytique de diènes-1,6." Aix-Marseille 3, 2001. http://www.theses.fr/2001AIX30029.
Full textThe aim of this thesis is the study of the enantioselective cycloisomerisation of 1,6-dienes by cationic and neutral palladium catalysts. A first, we prepared a series of new chiral nitrogen centred ligands, essentially, annelated pyrazoles from the " chiral pool ". These composed are obtained by condensation of chiral diketones with the hydrazine. A new synthetic way, in a " one-pot " sequence was finalised. It consists in condensing, under basic conditions, a conjugated enal or enone with the hydrazine substituted with a tosyle group. Subsequently, the alkylation of the chiral pyrazoles allowed to obtain some new mixed ligands (amino-alcohols, amides, and of β-amino-esters). A C2 symmetric bis-pyrazoles was obtained from 2,2-dimethoxypropane. At a second time, we studied the cycloisomerisation of 1,6-dienes. During this study, we could show that the selectivity of the cyclisation of the diallyle malonate, take as model, depends on the nature of the palladium complex and of its charge. Neutral and monocationic complexes, favour the exclusive formation of a cyclopentene (non-symmetric), whereas dicationic complexes favour the forming of an exomethylene cyclopentane
Lemière, Gilles. "Cycloisomérisations de dérivés alléniques catalysées par des complexes d'or et de platine." Paris 6, 2008. http://www.theses.fr/2008PA066329.
Full textJullien, Hélène. "Étude de cycloisomérisations énantiosélectives d'énynes catalysées par des platinacycles carbéniques." Phd thesis, Université Paris Sud - Paris XI, 2012. http://tel.archives-ouvertes.fr/tel-00776100.
Full textCariou, Kevin. "Nouvelles synthèses d'hétérocycles catalysées par des complexes de métaux de transition et des acides de Brønsted." Paris 6, 2006. http://www.theses.fr/2006PA066345.
Full textBrissy, Delphine. "Synthèse de complexes de platine chiraux et application à la réaction de cycloisomérisation d’enynes." Paris 11, 2009. http://www.theses.fr/2009PA112158.
Full textMetal promoted enynes cycloisomerisation are well known reactions lead to cyclic or bicyclic compounds from unsaturated substrates with the formation of one or several C-C bonds. The outcome depends closely on the substrat nature and on the catalytic system employed. These transformations have a great potential in organic synthesis that is why we were interested in developing chiral catalysts for the enantioselective version and more particularly, platinum complexes. We started first cationic platinum (II) complexes combining a chiral diphosphine and a N-heterocyclic carben a ligands. Then a second family of catalysts combining a bidentate N heterocyclic carben and a monophoshine was developed. The optimization of the catalytic system as well as its application in the allylpropagylamine cycloisomerisation enabled to obtain enantiomeric excess up to 97% for a total conversion of the enyne in bicycloheptenes. Finally these complexes were applied to the cycloisomerisation of hydroxylated 1,5 enynes. The preliminary studies showed that only catalysts as platinacvycle are active and enabled to obtain enantiomeric excess up to 68%
Savchuk, Mariia. "Complexes atropisomériques d'or-NHC : design, synthèse et applications dans des réactions de cycloisomérisation asymétriques." Electronic Thesis or Diss., Aix-Marseille, 2022. http://www.theses.fr/2022AIXM0571.
Full textThe first chapter of this manuscript is dedicated to survey the design of chiral NHC and their applications as ligand in gold-catalyzed enantioselective transformations. This presentation clearly showed the importance of new ligand designs, because only poor enantioselectivities have been reached up to date. A new concept of atroipsomeric transition metal-NHC complexes has been devised and developed in our group. Its application to prepare chiral transition metal complexes bearing C1-symmetric NHC ligand containing a satured backbone was investigated during my Ph.D. work and will be presented in the second chapter. Various chiral complexes were obtained, separated by chiral HPLC at preparative scale and their configurational stabilities were investigated in depth. The gold (I) containing complex was tried in the 1,6-enyne cycloisomerization, giving a promissing enantioselectivity (70% ee). In the third chapter of this manuscript, the concept of atroipsomeric transition metal-NHC complexes was extended to C2-symmetric NHC ligands and applied to the asymmetric Au(I)-catalyzed transformations. Diisopropyl malonate-tethered 1,6-enynes were identified as excellent substrates for cycloisomerization reactions and resulting alkoxycyclization products were isolated with excellent enantiopurities (7 examples with 51-92% yield, 56-99% ee). The cyclization without external nucleophiles led also to excellent results a (6 examples with 72-99% yield, 86-93% ee)
Jullien, Hélène. "Étude de cycloisomérisations énantiosélectives d’énynes catalysées par des platinacycles carbéniques." Thesis, Paris 11, 2012. http://www.theses.fr/2012PA112320/document.
Full textEnyne cycloisomerisations induce the formation of cyclic or polycyclic compounds from unsaturated substrates in a single step. These réactions catalysed by transition metals have a great interest in organic synthesis. However enantioselective versions of thèse reactions remain rare. Carbenic platinacycles with chiral monophosphines as ligands have been developped in our team. These complexes have been successfully used in the cycloisomerisation of allylpropargylamides into azabicyclo[4.1.0]heptenes ; enantiomeric excess up to 97% have been attained. This catalytic system has been extended to the desymetrisation of allylpropargylamides bearing a second vinyl moiety (ee’s up to 95%). These catalysts have been used also in the cycloisomerisation of 1,5-enynes bearing an oxygene fonstion at the propargylic position. Enantiomeric excess up to 75% have been obtained
Sémeril, David. "Catalyseurs du ruthénium sélectifs pour la métathèse et la cycloisomérisation de diènes et d'énynes fonctionnalisés." Rennes 1, 2001. http://www.theses.fr/2001REN10137.
Full textPradal, Alexandre. "Réactions de cycloisomérisation d'ènynes en présence de complexes d'or, de platine et d'ions halogéniums - Approche combinatoire en présence de complexes de platine. Réactions d'acyloxylation par activation C-H d'aromatiques en présence de complexes d'or." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2012. http://pastel.archives-ouvertes.fr/pastel-00832094.
Full textCoulombel, Lydie. "Cycloisomérisation d'alcools et d'acides carboxyliques insaturés catalysée par des triflates métalliques : application en chimie des arômes et parfums." Nice, 2004. http://www.theses.fr/2004NICE4105.
Full textCyclic ethers and lactones are important compounds in flavour and fragrance chemistry. The scope of this work was focused on the elaboration of a new catalytic system promoting cycloisomérisation of unsaturated alcohols and carboxylic acids to cyclic ethers and lactones, respectively. The use of metallic triflates (Mn+(OTf)n) as Lewis superacids led us to elaborate a new catalytic system involving aluminium or tin triflate (5% molar) in nitromethane. This system was applied to the synthesis of interesting compounds such as spiroethers, spirodilactones as well as cyclic thioethers and thilolactones. An alternative synthesis of rose oxide and Doremox was proposed. The use of chiral ligands to promote asymmetric cyclisations was examined and this study continues in our laboratory. A theoretical study associated to NMR analysis led to some mechanistic insights with proposed reaction mechanism
Grau, Fanny. "Nouvelle cycloisomérisation de diènes-1,6 catalysée par le triflimidure d'étain (IV) : applications à la synthèse de molécules odorantes." Nice, 2007. http://www.theses.fr/2007NICE4008.
Full textGenin, Emilie. "Catalyse en milieu organique et organoaqueux à l'aide de complexes de palladium, rhodium, platine, iridium et or : développements récents de réactions tandem et cycloisomérisations." Paris 6, 2006. http://www.theses.fr/2006PA066265.
Full textIn this manuscript are presented transition metal catalyzed additions to alkynes or enynes cyclisations. A new water soluble monophopshine m TPPTC has been synthesized. Its stereoelectronic properties have been investigated and led to an increased basicity compared to the sulfonated analog TPPTS. The m-TPPTC ligand turned out to be an efficient and selective ligand for the rhodium catalyzed addition of boronic acids to alkynes in an organoaqueous medium. Recycling of the catalyst was successfully achieved. Studies on tandem and cycloisomerization reactions have led to optimization of new catalytic systems based on gold, iridium and platinum complexes. Carbo and heterocycles can be obtained through alkoxycyclisation or Friedel-Craft/cyclisation reactions. An asymmetric version of this reaction has been developed. Acetals and lactones were also synthesized
Chao, Chung-Meng. "Nouvelles réactions à économie d'atomes : synyhèse de carbo- et d'hétérocyles fonctionnalisés par cycloisomérisations d'énymes catalysées par des complexes d'or et de platine." Paris 6, 2009. http://www.theses.fr/2009PA066383.
Full textKammerer, Claire. "Formation de liaisons C-C par enchainements domino et cycloisomérisations catalysés par des complexes de palladium, ruthénium et or." Paris 6, 2009. http://www.theses.fr/2009PA066179.
Full textFourmy, Kévin. "Complexes d'or(I) et de platine(II) portant des ligands phospholes : synthèse et applications dans l'activation d'alcynes." Toulouse 3, 2013. http://thesesups.ups-tlse.fr/2108/.
Full textHomogeneous alkyne activation by gold(I) and platinum(II) has witnesses an important growth in the past decade. Simple salts AuCl and PtCl2 have been initially used but the design of new ligands is essential to improve the activity, selectivity and stability of the catalysts. Phosphole ligands, and their application in catalysis is currently an important area of research in the team. In this context we decided to study these ligands in gold(I) and platinum(II) catalytic activation of alkynes. Gold(I) complexes [Au(L)Cl], and platinum(II) complexes,[Pt(L)2Cl2] bearing phosphole ligands have been synthesized. Their characterization, as well as the study of their structures, has allowed us to evaluate their stereo-electronical properties. Gold(I) complexes have been tested in 1,6-enyne cycloisomerization and olefin cyclopropanation reaction. 1-phenyl-2,3,4,5-tetramethylphosphole, TMP gave the best catalyst [Au(TMP)Cl]. It could also be isolated in its cationic form [Au(TMP)CH3CN]SbF6, which was found to be very active in 1,6-enyne cycloisomérisation. Platinum(II) complexes have been tested in cycloisomerization, alkoxy and hydroarylative cyclization of 1,6-enynes. The TMP ligand gave again the best catalyst [Pt(TMP)2Cl2]. During these catalytic trials, we also discovered a new platinum(II) catalyzed addition of aldehydes on 1,6-enynes. Our work shows how phosphole ligands and their gold(I) and platinum(II) complexes are specifics. In this study we also tried to rationalize ligand influence during the catalysis. This study allowed us to develop a new class of catalysts, which has opened to the design of new tools for p-acid catalysis
Couty, Sylvain. "Synthèse et réactivité d' ynamides." Paris 6, 2007. http://www.theses.fr/2007PA066017.
Full textParker, Évelyne. "Réactions de cycloisomérisation catalysées par des complexes d'argent ou de rhodium pour accéder à des dérivés de furoquinoléine, pyranoquinoléine et dibenzofurane." Phd thesis, Université Claude Bernard - Lyon I, 2010. http://tel.archives-ouvertes.fr/tel-00864994.
Full textParker, Évelyne. "Réactions de cycloisomérisation catalysées par des complexes d’argent ou de rhodium pour accéder à des dérivés de furoquinoléine, pyranoquinoléine et dibenzofurane." Thesis, Lyon 1, 2010. http://www.theses.fr/2010LYO10306/document.
Full textAmong a variety of new synthetic transformations, transition-metal-catalyzed reactions are some of the most attractive methodologies for synthesizing heterocyclic compounds. In this context, two different cycloisomerization reactions are studied. We first developed an efficient and versatile access to pyranoquinoline and furoquinoline derivatives, thanks to a tandem silver-catalyzed acetalization /cycloisomerization reaction. The synthesized compounds presented interesting antimalarial activity when tested on a resistant strain of the parasite Plasmodium Falciparum. The antitumoral activity of some furoquinolines was also investigated within a project funded by the French National League Against Cancer. Interestingly, we noticed that the regioselectivity of the cyclization can be controlled depending on the type of silver catalyst used. The observed reaction regioselectivity, including also an interesting nitrogen effect, led us to develop a silver imidazolate polymer as a stable and new silver catalyst. We also described a rhodium-catalyzed benzannulation reaction of silyl-enol-ethers onto alkynes, leading to dibenzofurans derivatives. These heterocycles are well-known for their biological properties and their interest in therapeutic chemistry. Finally, we developed an original methodology for the synthesis of oxindole derivatives
Fuente-Hernandez, Ariadna. "Réactions de cycloisomérisation d'énynes dérivés de monoterpènes catalysées par du platine, du rhodium et de l'or ; synthèse de molécules à activité biologique potentielle." Thesis, Toulouse, INPT, 2010. http://www.theses.fr/2010INPT0019/document.
Full textThe transition metals catalyzed cycloisomerization reactions of enynes are a powerful tool in organic synthesis: they give access, in only one atom-economic step, to a variety of interesting mono- or bicyclic structures, comprising 1,4-diene, 1,3-diene, cyclobutene or cyclopropane moieties. In order to reach new molecules derived from monoterpenes, O-tethered 1,6- and 1,7- enynes were prepared starting from perillyl alcohol, nerol and isopulegol, and their reactivity in cycloisomerization reactions catalyzed by transition metals salts or complexes was studied. New bi- and tricyclic molecules containing cyclopropane, 1,3- or 1,4-dienes moieties were thus synthesized. All these molecules were purified and characterized by NMR techniques. Various catalytic systems described in the literature were compared: PtCl2, AuCl3, [AuCl(PPh3)/AgPF6] and Rh2Cl2(CO)4. We thus could show that the nature of the final product depended especially on the starting enyne structure but also on concerned catalyst. Moreover we highlighted that kinetics and selectivity could be modified under CO atmosphere. Analogously, an asymmetrical version of the reaction was explored in the case of the 1,6-enyne derived from perillyl alcohol by preparing platinum or gold complexes with chiral phosphorated ligands. The observed diastereoisomeric excess on two obtained cyclopropanes thus could be increased in the case of gold (I) complexes, but the values remain still modest. Finally, we undertook a preliminary study of the cycloisomerization reaction in ionic liquid with an aim of conceiving an effective system for catalyst recycling. Various ionic liquids and different extraction solvents were tested for 1,6-enyne derived from perillyl alcohol. The activity and the selectivity of various catalysts proved, resulted modified compared to the reaction in toluene and reproducibility problems appeared. This study will have to be continued in order to optimize the conditions of reaction and the catalysts recycling
Coulombel, Lydie. "CYCLOISOMERISATION D'ALCOOLS ET D'ACIDES CARBOXYLIQUES INSATURES CATALYSEE PAR DES TRIFLATES METALLIQUES. APPLICATIONS EN CHIMIE DES ARÔMES ET PARFUMS." Phd thesis, Université de Nice Sophia-Antipolis, 2004. http://tel.archives-ouvertes.fr/tel-00205195.
Full textL'utilisation de superacides de Lewis de type triflates métalliques (Mn+(OTf)n) a permis l'élaboration d'un système catalytique faisant intervenir le triflate d'aluminium ou d'étain à 5% molaire dans le nitrométhane.
Ce système catalytique a ensuite été appliqué à la synthèse de divers squelettes intéressant en chimie des arômes et parfums tels que les éthers spiranniques, les spirodilactones ainsi que les thioéthers cycliques et les thiolactones. Une synthèse originale de l'oxyde de rose et du Doremox® a également été proposée.
En parallèle, l'introduction de ligands chiraux pouvant se coordinner au métal en vue de réaliser des cyclisations énantiosélectives a fait l'objet d'une étude qui est actuellement poursuivie au laboratoire.
Enfin, une étude mécanistique faisant appel à des calculs théoriques semi-empiriques ainsi qu'à des analyses par RMN a permis de proposer une hypothèse de chemin réactionnel.
Ke, Diandian. "Cooperative catalysis by 2-indenediide pincer complexes." Thesis, Toulouse 3, 2016. http://www.theses.fr/2016TOU30154/document.
Full textThis work contributes to the study of new indenediide pincer complexes, including their synthesis, characterization, and finally their activity in metal-ligand cooperative catalytic cycloisomerization of a range of alkynoic acids and N-tosyl alkynylamides. The 1st chapter compiled a non-exhaustive bibliographical survey of the field of metal-ligand cooperation in catalysis, from the pioneering work of Noyori using amido-Ruthenium complexes for hydrogenation, to the recent work of Milstein with pincer complexes based in dearomatized pyridine. The 2nd chapter of this thesis is dedicated to the development of the newly-tuned Pd indenediide pincer complexes and their application in metal-ligand cooperative catalysis. A structural modulation, by varying the R substituents Ph at phosphorus with iPr, was performed in attempt to increase the robustness of the Pd pincer complexes and enhance thereby their catalytic performance. Thus, two novel complexes were successfully synthesized and fully characterized (NMR, IR, XRD). Initial study demonstrated a better performance of the new complexes than their predecessor, as the cycloisomerization of N-tosyl alkynyl amides can be efficiently achieved. Moreover, the N-tosyl alkynyl amide scope was extensively studied, from linear non-substituted C5-C7, then substituted, benzo-fused, and finally to internal alkyne ones. Eventually, a majority of exo lactams products, together with the unusual internal endo lactam can be prepared in excellent yields (most often 90 %). Note that the obtaining for the first time of 7-member ring methylene caprolactam via a cycloisomerization was pretty inspiring. Nevertheless, improvements for the current catalytic system remain. The 3rd chapter of this thesis is devoted to further modulation of the pincer complexes, in particular the switching of metal center from Palladium to Platinum. The newly-synthesized Pt complexes were evaluated in the cycloisomerization of N-tosyl alkynylamides and alkynoic acids, and the dimeric complex with iPr groups at the P atoms exhibited the best performance. The substrate scope was further extended to more challenging ones. In most cases, reactions were remarkably accelerated. Direct comparisons upon amides and acids bearing internal alkyne further indicated that the Pt complex outperformed its Pd analogue. In particular, the Pt pincer complex is extremely efficient for the formation of 6 and 7-membered rings. In light of in-depth understanding of the mechanism, several selected additives were employed as H-bond donor, to reinforce the cyclization. The reaction rate and selectivity for 6-endo (vs 5-exo) as well as 6-exo (vs 7-endo) cyclizations was greatly improved by using pyrogallol. For the first time, a large variety of d and e-lactones/lactams could be prepared with high selectivities and in very good yields. These results emphasize the unique properties of SCS indenediide pincer complexes and extend further their catalytic applications
Ondet, Pierrick. "Synthèse d'éthers polycycliques par cycloisomérisations catalysées par des acides de Lewis : applications dans le domaine des arômes et parfums." Thesis, Université Côte d'Azur (ComUE), 2016. http://www.theses.fr/2016AZUR4075/document.
Full textPolycyclic compounds and more specifically, spirocyclic ethers are of particular interest in fragrance chemistry. This thesis is dedicated to the development of new cycloisomerisations of enol ether derivatives by bismuth(III) triflate catalysis. In this way, a bibliographic study has been carried out on cyclisations catalysed by bismuth(III) triflate. A cycloisomerisation of allenic enol ethers has been developed for the straightforward synthesis of cyclopentene and dihydrofuran derivatives. New oxaspirocyclic compounds have been obtained starting from trifunctional substrates containing a cyclic enol ether and an additional hydroxyl group. The chemodivergence of this reaction has been studied by means of gold(I) catalysis to access different cyclopentenic structures via the preferential activation of the allene. A double cyclisation reaction has been developed leading to bridged polycyclic compounds featuring an oxaspirocyclic moiety. Mechanistic studies have been performed and a tandem cyclisation involving a 1,5-hydride shift has been studied. The double cyclisation of enantioenriched campholenic aldehyde derivatives has been investigated for the formation of tetracyclic diethers and tricyclic ketones. Most of the new compounds presented interesting notes, mainly in the aromatic and woody olfactory family
Ni, Zhenjie. "Synthesis of Cyclobutenes and Bicyclo (2.1.0) pentanes Through Platinum and Ruthenium- catalyzed Reactions." Thesis, Ecole centrale de Marseille, 2014. http://www.theses.fr/2014ECDM0004/document.
Full textIn this manuscript, we have described an access to bicyclo[2.1.0]pentanes via two metal-Catalyzed reactions, namely a platinum-Catalyzed cycloisomerization of heteroatom-Tethered 1,6-Enynes and the subsequent ruthenium-Catalyzed cyclopropanation of cyclobutenes with tertiary propargyl carboxylates.First, we have developed the Pt(II)-Catalyzed formation of cyclobutenes from nitrogen and oxygen-Tethered 1,6-Enynes to form aza- and oxabicyclo[3.2.0]hept-6-Enes respectively. It is shown that the presence of alkyl substituent(s) at propargyl position and the use of weakly coordinating solvents such as DMA are the key elements favoring the formation of cyclobutenes.Second, the availability of cyclobutenes from the cycloisomerization of 1,6-Enynes has allowed their utilization for the construction of strained bicyclo[2.1.0]pentane structures as single diastereomers in good to excellent yield through a ruthenium-Catalyzed cyclopropanation. It provides a safe method which avoid the use of the hazardous diazo compounds precursors of carbenes to generate functionalized bicyclo[2.1.0]pentane frameworks in high yields under mild conditions
Guelen, Simon. "Approche des squelettes ladderanes par photocycloaddition [2+2] multiples." Thesis, Paris 6, 2016. http://www.theses.fr/2016PA066269/document.
Full textThe aim of this PhD work was to synthesize ladderane skeletons in one multiple [2+2] photocycloaddition step. The natural product pentacycloanammoxic acid is the target molecule of the project. In a first part, we developped an original method of intramolecular [2+2] photocycloaddition from sulfide polyenic precursors. Thus, four kind of cyclic compounds were obtained and characterized. This metodology has been applied to mono, di, and triene compounds, either sulfide or sulfone, by irradiation in a Rayonet photoreactor or in milder conditions with blue LEDs. Different strategies have been tested in order to create ladderanes, such as modification of polyene chain end, copper(I) and photoredox catalysis, or photosensitization, but none allowed the formation of more than one cyclobutane. Supramolecular encapsulation in cyclodextrins and cucurbiturils have provided quantitatively cyclobutane compound with syn-trans-syn configuration on small scale. This result studied in flow photochemistry is an encouraging perspective for ladderane preparation. We have also studied the synthesis of a pentacycloanammoxic acid metabolite model. In this context, a tricyclic ketone has been prepared first in seven steps with a gobal yield of 67%, based on a platinum(II) catalysed cycloisomerization as a key step. Then, the most advanced alcohol intermediaite has been obtained after six more steps in a 7.4% yield. Finally, a synthesis methodology has been developped around the tricyclic ketone intermediaite, of novel structure, allowing highly regio and diastereoselective transformations. Nucleophilic additions or ring expansion reactions such as Bayer-Villiger homologation or Beckmann rearrangement have been studied
Martinaux, Philippe. "Synthèse de nouvelles molécules odorantes selon des procédés de chimie durable." Electronic Thesis or Diss., Université Côte d'Azur, 2024. http://www.theses.fr/2024COAZ5004.
Full textThis manuscript presents the development and investigation of sustainable methods for the synthesis of molecules dedicated to the perfume industry. Today, gold catalysis can be considered a sustainable tool for synthetic chemistry. Indeed, catalysis is a major point of the twelve principles of Green Chemistry, and gold, a non-toxic metal, has enabled the design of many original skeletons for several decades.The first project developed during this thesis concerned the scaling-up of syntheses of molecules previously selected by experts from our industrial collaborator, Expressions Parfumées. These syntheses, carried out over several grams, have enabled advanced sensory analysis of certain compounds that may be of interest to industry. The methodology applied for these syntheses led to the formation of 3-oxabicyclo[4.1.0]-hept-4-enes in a diastereoselective and racemic manner. The structures were then described olfactory as racemic mixtures. As chirality may play an important role in odor perception, an asymmetric version of this methodology was developed and enantioenriched mixtures were compared olfactively. The second project focused on a tandem cycloisomerization/reduction reaction of alcohols or acetylenic acids in the presence of gold complexes and silane hydride. The limits of this type of reactivity were explored. Finally, cycloisomerization of oxygenated acetylenic acids led to the formation of volatile 1,4-dioxan-2-ones. Thanks to their varied olfactory profiles, these structures and their precursors could stand out in the future as olfactory substitutes for risky products, or simply as original new ingredients
Davenel, Vincent. "Nouvelles méthodologies de synthèse de dérivés polycycliques en présence de complexes d’or et d’indium." Thesis, Université Côte d'Azur, 2021. http://www.theses.fr/2021COAZ4023.
Full textThis work presents the synthesis of new skeletons, according to original methodologies, in order to increase the product bank (chemical library) within the framework of research and the design of new therapeutic active ingredients. A significant benefit to a drug candidate can be brought by increasing the complexity of the synthesized molecules, in particular by bringing three-dimensionality to the prepared synthons. A new catalytic methodology in the presence of carbophilic metals such as gold complexes and indium salts has proven to be very effective in creating new carbon-carbon bonds and accessing bridged bicyclic structures. The first chapter presents a selective bibliographic overview of gold chemistry and cycloisomerization reactions of 1,6-enynes. The second chapter proposes some examples of key pathways to access bicyclo[3.2.1]octanes and bicyclo[3.3.1]nonanes. The next chapter is dedicated to the results obtained, i.e. on the one hand the optimization of gold(I)-catalyzed cycloisomerization reactions of enynes leading to bicyclo[3.2.1]octane and bicyclo[3.3.1]nonane derivatives, and then the generalization to a wide range of substrates. The regioselectivity of the cyclization according to the 5-exo-dig or 6-endo-dig addition mode was studied and was shown to depend on the nature of the alkyne substitution. The reaction was then extended to many functionalized enynes, post-functionalizations were performed, as well as asymmetric synthesis after separation of enyne enantiomers by preparative HPLC on chiral phase. The last chapter is dedicated to a comparative study of the efficiency of gold and indium complexes in the cycloisomerization reactions of enynes. The particular cases of cyclization of ethyl propargyl derivatives and o-nitro-benzene alkyne derivatives are presented and lead to new tri- and hexacyclic structures
Ni, Zhenjie. "Synthesis of Cyclobutenes and Bicyclo (2.1.0) pentanes Through Platinum and Ruthenium- catalyzed Reactions." Electronic Thesis or Diss., Ecole centrale de Marseille, 2014. http://www.theses.fr/2014ECDM0004.
Full textIn this manuscript, we have described an access to bicyclo[2.1.0]pentanes via two metal-Catalyzed reactions, namely a platinum-Catalyzed cycloisomerization of heteroatom-Tethered 1,6-Enynes and the subsequent ruthenium-Catalyzed cyclopropanation of cyclobutenes with tertiary propargyl carboxylates.First, we have developed the Pt(II)-Catalyzed formation of cyclobutenes from nitrogen and oxygen-Tethered 1,6-Enynes to form aza- and oxabicyclo[3.2.0]hept-6-Enes respectively. It is shown that the presence of alkyl substituent(s) at propargyl position and the use of weakly coordinating solvents such as DMA are the key elements favoring the formation of cyclobutenes.Second, the availability of cyclobutenes from the cycloisomerization of 1,6-Enynes has allowed their utilization for the construction of strained bicyclo[2.1.0]pentane structures as single diastereomers in good to excellent yield through a ruthenium-Catalyzed cyclopropanation. It provides a safe method which avoid the use of the hazardous diazo compounds precursors of carbenes to generate functionalized bicyclo[2.1.0]pentane frameworks in high yields under mild conditions
Tugny, Coralie. "Application of the metal-catalyzed rearrangement of propargyl acetates to the total synthesis of natural products of the neomerane family : application in catalysis of new secondary phosphine oxide- and NHC-capped cyclodextrin-gold(I) complexes." Thesis, Paris 6, 2015. http://www.theses.fr/2015PA066607.
Full textThe study of small molecule natural products provides some knowledge about organic chemistry and has an impact on biomedical research. Transition metal-catalyzed reactions have been frequently used to affect key transformations. Especially, there has been a noticeable trend during the past decade towards the use of homogeneous gold-catalyzed transformations. This work aims at the valorization of the gold-catalyzed rearrangement of propargyl acetates in the total syntheses of (±)-Valeneomerin B and (±)-Neomeranol. These compounds are sequiterpenoid natural products, the synthesis of which has been envisioned from the preparation of a common intermediate resulting from the gold-catalyzed rearrangement of a propargyl acetate precursor. At the same time, the behaviour of new secondary phosphine oxide- and CNHC-capped cyclodextrin-gold(I) complexes has been studied, to try and achieve better control on the course of gold-catalyzed transformations
Wu, Zhiyong. "Synthèse de nouveaux catalyseurs chiraux d’or(I) et applications en catalyse énantiosélective." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLS244.
Full textThe gold(I)-catalyzed cycloisomerization reactions provide powerful tools for the synthesis of heterocycles and carbocycles in both racemic and enantiomerically enriched forms. The direct cyclization of enyne substrates to form new C-C or C-heteroatom bonds proved to be an efficient atom and step economy approach for the synthesis of bicyclic or tricyclic compounds. The well-known cyclizations of 1,6- and 1,5-enynes into bicyclic compounds are one of the most powerful examples. Moreover, during the last few years, our group developed several series of chiral platinum or gold pre-catalysts which exhibit excellent catalytic activity, diastereoselectivity and enantioselectivity in the cyclization of enyne substrates.As far as we know, gold complexes with central, axial and helical chirality exhibited excellent results both in terms of catalytic activity and enantioselectivity. However, the planar chirality has been rather neglected so far in the gold promoted enantioselective cyclizations. Although some planar chiral gold complexes (mainly based on the ferrocene structure) have been reported in recent years, high enantioselectivity proved particularly difficult to obtain. In order to extend the potential applications of the planar chiral gold complexes, we have synthesized two new family of gold complexes with planar chirality and applied them in the cycloisomerization of 1,5-enynes and 1,6-dienynes. Finally, with several families of chiral gold complexes (with axial, planar or helical chirality) in hand, we developed a new type of cycloaddition reaction, with excellent catalytic activity and enantioselectivity.This thesis summarizes these studies: i) The chiral monodentate phosphines based on ortho-disubstituted ferrocene units have been prepared and used for the synthesis of gold(I) complexes. These complexes proved to be very active catalysts for the cycloisomerization of 3-hydroxy-1,5-enynes into bicyclo[3.1.0]hexanones. Their high catalytic activity is ascribed to their structural analogy to the biaryl-based Buchwald phosphines. ii) We have also synthesized and characterized new chiral phosphoramidites and demonstrated for the first time the ability of planar-chiral gold(I) complexes to obtain high enantioselectivities in cycloisomerisation reactions. Furthermore, starting from N-tethered prochiral dienynes, the corresponding bicyclo[4.1.0]heptane derivatives, containing three contiguous stereocenters, were obtained in good yields, with a total diastereoselectivity and up to 95% ee. iii) With a number of chiral gold complexes (with axial, planar or helical chirality), an efficient approach for the cycloaddition of cyclopropylenynes has been developed, based on the enantioselective gold catalyzed cycloaddition reaction. This novel method provides an easy access to the enantioselective synthesis of cyclobutanones and the further preparation of chiral tricyclic compounds possessing the skeleton of natural products. We have highlighted axial bis(phosphine)digold(I) complexes which afforded the cyclobutanones with up to 99% enantiomeric excesses in these cyclization reactions
Biletskyi, Bohdan. "Développement de nouvelles transformations catalysées au cobalt." Thesis, Aix-Marseille, 2018. http://www.theses.fr/2018AIXM0668/document.
Full textThe application of cobalt in organic synthesis and catalysis has been known since the 1970s, especially in Pauson-Khand reaction. Until now, a lot of catalytic systems with cobalt have demonstrated their efficiency in various chemical transformations including [2+2+2] cycloadditions or the activation of C(sp2)-H bonds. In this manuscript are presented the chemical transformations based on the use of cobalt to catalyze atom-economical reactions, and the attempts to develop enantioselective versions. First of all, the activity of cobalt(I) catalysts was established for the cycloisomerisation reaction of dienynes giving bicycles[4.3.0]. The studies of different parameters of the catalytic system, as well as the scope reaction, will be presented. Moreover, the catalysts based on cobalt(II) acetate proved to be very efficient for hydroalkynylation reactions. The hydroalkynylation reaction of vinylaziridines was developed after catalyst optimisation and, the scope reaction according to the nature of reactants was defined. Finally, preliminary studies of enantioselective allylation using cobalt(II) catalysts were performed. These promoters were found to be activators of the carbonyl group, thus compromising the asymmetric version of the reaction
Borie, Cyril. "Activité anticancéreuse et réactivité des ènediynes." Thesis, Aix-Marseille, 2016. http://www.theses.fr/2016AIXM4737.
Full textSynthesis of a new family of enediynes bearing a perfluorinated moiety was reached in 6 to 7 steps. Their anticancer activity was studied on a cell line panel from different tissues; IC50 values in the µM range were obtained. Their 19 fluorine MRI response was also evaluated, in order to involve them in a theranostic strategy (association of therapy and diagnosis). A mechanistic study was conducted to understand the biological mechanism at stake inside cells.Enediynes often saw their development stopped because of harmful side effects. To anticipate this problem, targeting strategies were developed for our compounds. First, their response to UV irradiation was measured. We then succeeded in their encapsulation inside polymeric micelles.Finally, in a more fundamental project, reactivity of enediyne and diene-yne substrates was studied. Cycloisomerisations proceeding with a double chirality transfer were developed, allowing access to benzofulvenes and indenes. Two variations of a tandem Alder-Ene reaction leading to allyl-indenes were also described
Costes, Philippe. "Cycloisomérisations d'énynes issus de monoterpènes par différentes voies catalytiques." Toulouse, INPT, 2007. http://ethesis.inp-toulouse.fr/archive/00000639/.
Full textMonoterpenes represent a large family of natural molecules, which have a moderate cost and present interesting olfactive and biological properties. The possibility of obtaining best use from these natural substrates goes through their functionalization, with the aim at increasing the known biological activity of such natural products or at investigating novel properties. In this context, the successful use of selective catalytic tools, respecting the principle of atom economy, is both interesting and challenging. Catalytic reactions involving carbon monoxide have already permitted to selectively transform many monoterpene into esters, ketones, or lactones in the presence of rhodium and palladium complexes. To further ameliorate such approach and to widen the number of accessible structures, thus developing novel molecules, we have introduced an intermediate stage consisting in the functionalization of these substrates: the transformation of the monoterpenic substrate into an enyne, known for its ability to give rise to cyclocarbonylation and cycloisomerisation reactions. Several monoterpenes carrying an alcoholic group have been functionalized via an Oalkynylation reaction to provide the corresponding enynes. Starting from these substrates, cycloisomerisation reactions catalyzed by complexes of transition metals have been investigated. Various catalytic systems were used: PtCl2, AuCl3 and [Rh2Cl2(CO)4]. The Pauson-Khand cyclocarbonylation reaction has also been adressed. Novel bi- and tricyclic substrates containing cyclopropane, diene or cyclopentenone moieties could be synthetized. These novel molecules arising from monoterpenes have been isolated and fully characterized by NMR and mass spectrometry. The study of the various enynes and of the relevant molecules has shown that the structure of the end products is often dependent on the nature of the enyne. Furthermore, we have evidenced that rhodium(I) complexes could be involved in the formation of cyclopropane-fused rings, providing higher selectivities than platinum salts precursors. Besides, within a collaboration with a research hospital laboratory, the antifungal biological properties and antiplasmodial activity of these new molecules have been tested: preliminary results indicate that the generation of a cyclopentenone could result in a significant increase in the antiplasmodial activity with regard to some monoterpenes
Tang, Yue. "Catalyse asymétrique en présence de complexes d'or(I) - Un nouvel arsenal pour la construction d'architectures moléculaires." Thesis, Paris Sciences et Lettres (ComUE), 2019. http://www.theses.fr/2019PSLEC038.
Full textOver the last years, gold catalysis has gained considerable significance in organic synthesis, since it comprises atom-economic and highly efficient processes for the transformation of relatively simple substrates into valuable, highly complex molecular architectures. Despite these outstanding advances, the enantioselective variants have not flourished as fast and remain a highly challenging task. This project intends to address some technological barriers and contribute to fundamental research in the field of asymmetric cycloisomerization and domino reactions implying gold(I) and gold(III) catalytic systems, on a first approach, and highly modular chiral carbenic ligands. The ligands will be based on chiral N-Heterocyclic Carbenes (NHCs), as they represent a very effective and robust class of supporting ligands. More specifically, we will focus on the development of highly modular NHC architectures specifically designed to bring the chiral information in close proximity to the metallic center, which represents a key feature for an efficient asymmetric induction in gold catalysis. The target substrates of catalysis will be divided in two main classes, namely the 1,n-enynes and the unsaturated carbonyl/imino derivatives, since their gold(I)- and gold(III)-catalyzed conversion will afford a great molecular complexity. By taking advantage of the different reactivities and catalytic profiles of the NHC-Au(I) and NHC-Au(III) complexes, along with their silver counterparts, this project will allow the elaboration of a complete panel of efficient, general and unprecedented enantioselective catalytic systems towards the preparation of bio-relevant building blocks, precursors of natural products and biologically active molecules
Yavari, Keihann. "Design et synthèse de phosphahélicènes chiraux. Application en catalyse asymétrique." Thesis, Paris 11, 2013. http://www.theses.fr/2013PA112276.
Full textIn the first part of the manuscript, we have demonstrated the importance of helicenes by recalling their application fields, thus highlighting the interest of the scientific community to this class of compounds. We have summarized then the main results of our work. Our objective was the synthesis of phosphahelicene where the phosphorus moiety is included in the terminal aromatic ring of the helical framework. Following a photocyclisation approach, we developed a synthetic pathway starting from olefines substituted by1H-phosphindoles. A [2+2] dimerisation reaction between the terminal double bonds of two helicenes was also observed, which led to the first dimers of helicenes reported in the literature. The photocyclisation being highly diastereoselective, we were able to obtain enantiopur phosphahelicenes by using a chiral substituent on the phosphorus atom. We then used dibenzophospholes, as starting materials, instead of 1H-phosphindoles that resulted in the formation of a new series of phosphahelicenes in improved yields. The corresponding phosphahelicenes were used to form gold and iridium complexes. The Au-phosphahelicene complexes were tested in cycloisomerisation reactions of 1,6 aza-enynes and showed good activity but very poor asymmetric induction.To increase the chiral induction, we chose to come back to phosphindoles as a phosphorus core but we improved their design: aryl substituents were added in alpha position to the phosphorus atom. After formation of the new helicenes and their corresponding gold complexes, investigation of their catalytic properties highlighted the correct geometry and structural features needed for a good asymmetric induction.Enantiomeric excesses up to 86% were obtained. This work allowed the design of a new family of efficient gold catalysts for enantioselective cycloisomerisation
Biletskyi, Bohdan. "Développement de nouvelles transformations catalysées au cobalt." Electronic Thesis or Diss., Aix-Marseille, 2018. http://theses.univ-amu.fr.lama.univ-amu.fr/181207_BILETSKYI_50nlz932ipxkk485izc94s_TH.pdf.
Full textThe application of cobalt in organic synthesis and catalysis has been known since the 1970s, especially in Pauson-Khand reaction. Until now, a lot of catalytic systems with cobalt have demonstrated their efficiency in various chemical transformations including [2+2+2] cycloadditions or the activation of C(sp2)-H bonds. In this manuscript are presented the chemical transformations based on the use of cobalt to catalyze atom-economical reactions, and the attempts to develop enantioselective versions. First of all, the activity of cobalt(I) catalysts was established for the cycloisomerisation reaction of dienynes giving bicycles[4.3.0]. The studies of different parameters of the catalytic system, as well as the scope reaction, will be presented. Moreover, the catalysts based on cobalt(II) acetate proved to be very efficient for hydroalkynylation reactions. The hydroalkynylation reaction of vinylaziridines was developed after catalyst optimisation and, the scope reaction according to the nature of reactants was defined. Finally, preliminary studies of enantioselective allylation using cobalt(II) catalysts were performed. These promoters were found to be activators of the carbonyl group, thus compromising the asymmetric version of the reaction
Borie, Cyril. "Activité anticancéreuse et réactivité des ènediynes." Electronic Thesis or Diss., Aix-Marseille, 2016. http://www.theses.fr/2016AIXM4737.
Full textSynthesis of a new family of enediynes bearing a perfluorinated moiety was reached in 6 to 7 steps. Their anticancer activity was studied on a cell line panel from different tissues; IC50 values in the µM range were obtained. Their 19 fluorine MRI response was also evaluated, in order to involve them in a theranostic strategy (association of therapy and diagnosis). A mechanistic study was conducted to understand the biological mechanism at stake inside cells.Enediynes often saw their development stopped because of harmful side effects. To anticipate this problem, targeting strategies were developed for our compounds. First, their response to UV irradiation was measured. We then succeeded in their encapsulation inside polymeric micelles.Finally, in a more fundamental project, reactivity of enediyne and diene-yne substrates was studied. Cycloisomerisations proceeding with a double chirality transfer were developed, allowing access to benzofulvenes and indenes. Two variations of a tandem Alder-Ene reaction leading to allyl-indenes were also described
Tang, Shun. "Cycloisomérisations catalysées par les sels du gallium et les complexes NHC-Gallium(III)." Thesis, Paris 11, 2013. http://www.theses.fr/2013PA112271.
Full textRecently, in order to develop alternative activation methods for Pi-systems in homogeneous catalysis instead of employing expensive and toxic noble metal catalysts, first row transition metals and main group metal complexes have attracted great attention. This thesis is a contribution to it, and we focus on gallium chemistry. There are three main aspects dominating this thesis: gallium(III) halides, well-defined gallium(III) complexes bearing N-heterocyclic carbenes (NHCs), and -systems activation in catalysis.The thesis is divided into three chapters. Chapter I provides an overview of the field of organic synthesis involving gallium(III) compounds, focusing on their use as - or -Lewis acids.In Chapter II, we expose our attempts to exploit the catalytic potential of gallium(III) chloride in a novel tandem cycloisomerization/Friedel-Crafts reaction. A section dedicated to the study on GaCl3-catalyzed alkyne hydration is also provided.Chapter III begins with a description of the synthesis of a series of gallium(III) complexes bearing various NHCs as ligands in order to overcome the limitations of gallium(III) halides in catalysis. Next, methodology studies on the tandem process involving 1,6-arenynes with the neutral and cationic gallium(III) complexes are described. The evaluation of scission kinetics for catalysts, substrates variation and influence of counteranions are discussed. In addition, efforts towards the asymmetric version of this tandem transformation and some other cyclizations are also presented.The concluding chapter reiterates the most important results obtained in the body chapters of the thesis. To conclude, the future directions for the research on the use of the NHC-gallium(III) complexes are discussed
Schäfer, Christian. "Reactivity of acetylenic ω-keto-esters towards transition metal complexes : synthesis of polycyclic motives of natural products." Thesis, Strasbourg, 2013. http://www.theses.fr/2013STRAF006/document.
Full textIn this work, the reactivity of acetylenic ω-ketoesters towards different metal complexes was investigated. When acetylenic ω-ketoesters are submitted to Ti(OiPr)4/iPrMgBr, the formation of fused bicyclic γ-hydroxy-α,β-unsaturated esters was observed. The products were obtained with absolute selectivity in regard to the ring junction formed (cis) and the configuration of the double bond (E) and could be transformed into the corresponding α,β-unsaturated lactones, substructures of various natural products. When ω-ketoalkynes are used in Ag(I)-catalyzed cycloisomerization reactions, the formation of spirocyclic compounds was observed. By taking advantage of the reaction intermediates of this reaction, it was possible to isolate the corresponding spirocyclic alkenyl iodides. Performing cycloisomerization reactions with acetylenic ω-ketoesters, spirocyclic α,β-unsaturated esters are formed. We could show that these products are valuable substrates for the formation of 6-5-5- and 6-6-5-fused tricyclic systems which represent the skeleton of a large group of natural products
Zhang, Yang. "New catalysts for platinum and gold promoted cycloisomerization reactions." Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112264.
Full textIn this work, we have carried out the first systematic investigations on the enantioselective transition metal-promoted cycloisomerizations of 1,5-enynes with hydroxyl functions at their propargylic positions. These experiments have highlighted a series of platinacyclic NHC-complexes afforded bicyclo[3.1.0]hexanones in up to 81% enantiomeric excess. In the second part of our work we have prepared both known and new phosphahelicenes via the oxidative photocyclization of olefins suitably made from phosphindole building blocks. We have demonstrated that this synthetic method allows modulation of the phosphahelicene structure. Gold(I) complexes have been prepared then from these phosphahelicenes. These complexes have been evaluated in the challenging field of the gold-catalyzed enantioselective cycloisomerizations of enynes. In the cycloisomerization of NTs tethered 1,6-enynes, we could obtain very high catalytic activity and good enantioselectivity, with up to 81% ee, by using the P-menthyl-substituted helicenes as chiral ligands. The cycloisomerization of 1,6-dien-8-ynes, which afforded bi- or tricyclic compounds in one step, at room temperature, in high yields and excellent enantiomeric excesses (up to 86% ee). Thus, we have demonstrated that phosphahelicenes-gold complexes represent a new class of efficient catalysts, which complements the few chiral gold catalysts known so far. The chiral phosphahelicenes above have been evaluated briefly in a totally different field, that is nucleophilic organocatalysis. The trivalent phosphahelicenes proved able to promote the enantioselective [3+2] cyclizations between olefins and allenes, giving cyclopentene derivatives in excellent enantiomeric excesses (up to 96% ee). Finally, we have investigated the use of N-heterocyclic phospheniums as ligands in transition metal catalysis, starting from platinum promoted cycloisomerizations as the model reactions. In doing these challenging, exploratory experiments, we have noticed a moderate stability of the few platinum-NHP complexes prepared so far. Nevertheless, the cationic Pt(0) complex (mesNHP)Pt(PPh₃)₂⁺OTf could be generated in situ. It displayed moderate but significant catalytic activity in the cycloisomerization of a 3-hydroxy-1,5-enyne (51% isolated yield). These experiments afford a proof-of-concept, but additional work is required to identify the most suitable metal/NHPs pairs leading to stable and efficient pre-catalysts. The cationic nature of the NHP ligands might open totally new perspectives in organometallic catalysis. Further studies on this topic will be carried out in our group in the near future
Brunel, Paul. "Complexes pince et cooperativité métal/ligand : application en catalyse." Thesis, Toulouse 3, 2018. http://www.theses.fr/2018TOU30275/document.
Full textThis Ph.D. work deals with organometallic chemistry of indenyl/indenediide palladium and platinum pincer complexes and their applications in metal-ligand cooperative catalysis. The first chapter of this manuscript compiled a non-exhaustive bibliographic survey of the field of metal-ligand cooperation, from Noyori's system applied to the asymmetric hydrogenation, to the recent examples described by Milstein involving non-aromatic pincer ligands. Pincer ligands are also presented. Starting from the first example, in which Shaw shed light a PCP pincer, to the contemporary CNC pincer reported by Bezuidenhout. The versatility of those ligands is illustrated through few modulations allowing originals reactivities or stabilisation of highly unstable species. The second chapter is focused on the development of a new catalytic reaction with the indenediide palladium pincer complex. This reaction entail, for the first time, two substrates, the CO2 as a C1 source and propargylamines/homopropargylamines. The mechanistic studies turn out the importance of the metal-ligand cooperativity. Then, the third chapter concerns exploratory chemistry. New reactivities have been studied with the platinum complexes. The activation of low polar bond such as H-H and H-Si allowed the reduction of unsatured C-C bond. The mechanistic propositions, that remain to be confirmed, seem to indicate the feasibility of ? bond metathesis and migratory insertions. Finally, the last chapter is dedicated to the development of a new ligand. The latter showed the distinctive characteristic to be hemilabile, leading the way of new reactivities. His coordination to palladium, followed by his deprotonation to give rise to the non-innocent nature of the complex is presented, as well as the application of the resulting complex in the context of a cycloisomerisation. Those results are reflecting the importance of the indenyl and indenediide pincer ligands besides the metal-ligand cooperativity in catalysis
Habert, Loïc. "Synthèse et étude de la réactivité d'ynamides. Application pour la synthèse de composés azotés d'intérêts biologiques." Thesis, Orléans, 2018. http://www.theses.fr/2018ORLE2065.
Full textThe constant demand for original small molecule collections with promesing therapeutic potential have required the development of new and efficient synthetic methods. Given the nitrogen ubiquity in nature and in life sciences, the aim of this work is the development of original heterocyclic building blocks, originated from the functionalization of ynamide frameworks. Our goal was to study the reactivity of ynamides in order to synthesize from a common skeleton small library of nitrogen or oxygen compounds with biological relevance. The implementation of a new innovative methodology has been necessary, while trying to adhere to the following principles: atom economy, catalytic reaction, fast synthesis in minimal steps, and control of chemo- and regioselectivity.Firstly, we studied the carbozincation reaction of ynamides allowing access to several substituted enamides. Subsequently, cycloisomerization reaction of yne-carbamates has allowed us the development of two novels methodologies using zinc (II) or rhodium (II) salts, which provide access to oxazolone scaffolds. Our research has been studying the keteniminium ion intermediates accessible via an acid activation of ynamide. The development of two methods for the 3-amino-isocoumarin core was achieved via addition of Lewis or Brønsted acid or via electrophilic cyclization. Finally, a tandem coupling / cycloisomerization / nucleophilic addition reaction was carried out in order to prepare 1H-isochromene
Graux, Lionel. "Nouveaux complexes de ruthénium (II) associés aux Oxydes de Phosphine Secondaire (OPS) : Synthèse, caractérisation et application en catalyse." Thesis, Aix-Marseille, 2014. http://www.theses.fr/2014AIXM4366/document.
Full textThe past decade has witnessed a renewed interest for Secondary Phosphine Oxides (SPO) in catalysis as preligands of transition metals. While the coordination chemistry and catalytic activity of these species have been mainly studied with palladium and platinum, only few examples with ruthenium have been reported so far.We investigated the synthesis of new ruthenium(II) complexes associated to one or two phosphinous acid ligand (PA) (SPO tautomer) which were fully characterised. Then we were interested in the role played by the ligand during the catalytic cycle. The use of different ruthenium sources allowed us to isolate [Ru]/SPO complexes (oxygen coordinated) and [Ru]/PA complexes (phosphorous coordinated). We evaluated the catalytic activities of these well-defined complexes in C-H bond activation and cycloisomerisation from alkynes or ynamides. During the course of these studies, the influence of ligand stereoelectronic parameters in the catalytic process have been demonstrated.Moreover, in a side project, we explored a new reactivity of ynamides with cyclic 1,3-diketones catalysed by palladium, cationic gold or ruthenium complexes. This reactivity gives access to alpha-alkoxysubstituted enamides
Gaillard, Sylvain. "Cycloisomérisations et cycloadditions de (poly)ènes-ynes catalysées par le platine(II) ou le ruthénium(II)." Aix-Marseille 3, 2007. http://www.theses.fr/2007AIX30003.
Full textPtCl2 promoted the cycloisomerization of 2-(pent-4-ynyl)-norbornenes or norbomadienes through a skeletal reorganization. This complex process occurred with a one carbon atom ring expansion of one carbocycle and with the cleavage of both double and triple bonds of the initial enyne and the carbon atoms of the insaturations are alternate in the newly 1,3-diene unit. In contrast, in the presence of (nbd)RuCl2(PPh3)3, 2-(pent-4-ynyl)-norbomadienes afforded polyfunctional pentacyclenes through the homo Diels-Alder reaction. These polycyclic structures were converted in few steps into angular triquinanes, with a stereochemical control of five stereogenic centers through the selective cleavage of two carbon-carbon bonds of the cyclopropane unit. PtCI; catalyzed the cycloisomerization of 1-(pent-4-ynyl)-cycloheptatrienes taking advantage of the conjugated triene to react with the alkyne in a process viewed as a formal intramolecular [6+2] cycloaddition
Seijo, Lorenzo. "Développement de méthodologies catalysées par les superacides de Lewis : applications pour l'industrie de la parfumerie." Thesis, Université Côte d'Azur, 2020. http://www.theses.fr/2020COAZ4026.
Full textIn cooperation with Firmenich SA®, we decided to explore three subjects concerning high added value molecules, whose synthesis protocols, currently used in the flavour & fragrance industry, could be improved. We studied different synthetic routes in order to improve three different procedures. Among the various strategies envisaged, acid catalysis and particularly, Lewis superacids catalysis was favoured. A first subject concerned the preparation of hindered ethers by functionalizing a particular hindered alcohol. Among the 12 synthetic strategies discussed, two of them concerning a total synthesis, resulted in the formation of the desired derivatives. The activation of olefins in the presence of carbonyl derivatives has been examined in a second chapter. The desired coupling products were obtained in a strong acid medium. The intramolecular cyclization of alcohols in aqueous medium has been examined in a third part. A twostep procedure concerning a dehydration step with HOTf (0.1 mol%) and a cyclization step with Bi(OTf)3 (1 mol%) has been proposed. This synthesis could be carried out on a 20 g scale. Finally, a methodology for the tandem cycloisomerisation of doubly unsaturated alcohols by heterogeneous catalysis was studied. Moreover, from analogous substrates, a method for obtaining acetal derivatives via a 1,5-hydride transfer catalysed by Hf(OTf)4 (1 mol%) was developed
Laher, Romain. "Synthèse de nouvelles molécules odorantes par catalyse à l’or (I) : L’or au service de la parfumerie moderne." Thesis, Université Côte d'Azur, 2020. http://www.theses.fr/2020COAZ4083.
Full textThis manuscript is concerned with the synthesis of interesting olfactory compounds for use in the perfume industry. A first bibliographic chapter highlights the use of transition metals as reaction catalysts for the synthesis of compounds marketed and used in perfumes. The work described in this manuscript presents the optimization and development gold (I)-catalyzed cycloisomerization of 1,6-enynes and additions of nucleophiles on acetylenic substrates in order to obtain molecules of interest for the perfume industry. The second chapter of this manuscript deals with the synthesis of 3-oxabicyclo[4.1.0] -hept-4-enes derivatives. These compounds could be produced with very good yields at low catalytic loads, making the industrialization of such structures possible. Remarkably, all of the compounds synthesized were of olfactory interest, whether they were the starting derivatives or the products of cycloisomerization. It has been possible to demonstrate an induction of chirality within the framework of the cycloisomerization reaction of 1,6-enynes via the use of substrates enantiomerically substituted in the -allylic position. The third chapter highlights the first examples of tandem reaction of cycloisomerization / reduction of acetylenic alcohols have been carried out leading to a new route of synthesis of furanic and pyranic derivatives. The use of gold catalyst allows the formation of an exocyclic enol ether followed by the reduction of the unsaturation formed through the use of an organosilane as Et3SiH. All of the synthesized compounds evaluated present remarkable scores allowing to consider substitutions of risky products by new ingredients with similar organoleptic properties
Graux, Lionel. "Nouveaux complexes de ruthénium (II) associés aux Oxydes de Phosphine Secondaire (OPS) : Synthèse, caractérisation et application en catalyse." Electronic Thesis or Diss., Aix-Marseille, 2014. http://www.theses.fr/2014AIXM4366.
Full textThe past decade has witnessed a renewed interest for Secondary Phosphine Oxides (SPO) in catalysis as preligands of transition metals. While the coordination chemistry and catalytic activity of these species have been mainly studied with palladium and platinum, only few examples with ruthenium have been reported so far.We investigated the synthesis of new ruthenium(II) complexes associated to one or two phosphinous acid ligand (PA) (SPO tautomer) which were fully characterised. Then we were interested in the role played by the ligand during the catalytic cycle. The use of different ruthenium sources allowed us to isolate [Ru]/SPO complexes (oxygen coordinated) and [Ru]/PA complexes (phosphorous coordinated). We evaluated the catalytic activities of these well-defined complexes in C-H bond activation and cycloisomerisation from alkynes or ynamides. During the course of these studies, the influence of ligand stereoelectronic parameters in the catalytic process have been demonstrated.Moreover, in a side project, we explored a new reactivity of ynamides with cyclic 1,3-diketones catalysed by palladium, cationic gold or ruthenium complexes. This reactivity gives access to alpha-alkoxysubstituted enamides
Blaszykowski, Christophe. "Réactivités radicalaire et dianionique d'amines β,γ-insaturées : synthèse de γ-amino-alcools et de 3-sila-pipéridines : cycloisomérisations d'énynes-1,5 catalysées par PtCl2." Paris 6, 2005. http://www.theses.fr/2005PA066044.
Full textVanitcha, Avassaya. "New ligands for asymmetric catalysis from allenes." Thesis, Paris 6, 2015. http://www.theses.fr/2015PA066714/document.
Full textThis thesis has focused on the synthesis of new ligands bearing chirality for asymmetric catalysis. We first aimed to synthesize chiral allenes with phosphine moieties and use them as ligands of transition metals such as gold(I) species. Allenes bearing a phosphine oxide group were prepared from the corresponding propargylic acetate precursors in moderate to high yields. When substituted by a pyridine substituent, these substrates efficiently combined with gold(I) species to afford two types of new vinyl gold complexes. One cationic vinyl complex featuring a triphenylphosphine gold(I) moiety can be further functionalized to give an indolizinium salt and a vinyliodide derivative. The other one bearing a chlorogold(I) group can be used as a catalyst in gold-catalyzed cyclization. Moreover, other allenes have been investigated in gold(I)-catalyzed rearrangements. To our delight, the allenes featuring a 3,5-methoxyphenyl substituent and a vinylallene can produce respectively indenyl and cyclopentadienyl phosphine oxide products bearing stereogenic centers. In addition, a complete axial-to-center chirality transfer was observed on the indenylphosphine oxide product starting from the optically pure allene. In a next attempt, we have prepared some new digold-allenyl bisphosphine precatalysts. These new complexes can be used in gold-catalyzed intermolecular reactions and cyclization reactions. Several carbo- and heterocyclic products were produced in moderate to excellent yields. These chiral gold complexes could be separated by preparative chiral HPLC. Some promising enantiomeric excesses were observed in cycloisomerization reactions
Augé, Mylène. "Stratégie de l'anion chiral en catalyse asymétrique organométallique." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2012. http://tel.archives-ouvertes.fr/tel-00827532.
Full textCampolo, Damien. "Transfert de chiralité dans les réarrangements en cascade d'ènediynes." Thesis, Aix-Marseille, 2013. http://www.theses.fr/2013AIXM4339/document.
Full textThe asymmetric synthesis of azaheterocycles (tetrahydorisoquinolines and naphthodiazepines) was successfully achieved via the polar/radical cross-over rearrangement of enediynes bearing a stereogenic center. This process involves successively : enyne-allene formation (via 1,3-proton shift, reaction of a terminal alkyne group with carbenoids or Crabbé homologation)/Saito-Myers cyclization/1,5-hydrogen atom transfer/biradical recombination. It was ideally suited to apply a strategy based on the memory of chirality phenomenon. Mechanistic studies based on isotopic labelling and theoretical calculations enabled to go deeper into the understanding of the parameters controlling the regio- and the stereoselectivity of the reaction. The ambition to control two stereogenic centers via double memory of chirality, led us to investigate the transfer of the axial chirality of a designed allenic moiety. This study led to the discovery of an original copper (I)-mediated cycloisomerization leading to chiral fulvenes and proceeding via central-to-axial-to-central double chirality transfer