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1	Biocatalysis in organic synthesis using microorganisms and immobilised enzymes Lemoult, Stephanie Claudette January 1994 (has links) No description available. 547 Biocatalysts; Baeyer Villiger oxidation
2	Process issues in redox biocatalysis : cyclohexanone monooxygenase catalysed chiral lactone syntheses Hogan, Matthew Charles January 2000 (has links) No description available. 572
3	Metal based asymmetric catalysis in Baeyer-Villiger oxidations Palazzi, Chiara. Unknown Date (has links) (PDF) Techn. Hochsch., Diss., 2002--Aachen.
4	Oxidação Baeyer-Villiger de cicloexanona com peroxido de hidrogenio catalisada por alumina / Alumina-catalyzed-Villiger oxidation of cyclohexanone with hydrogen peroxide Steffen, Rafael Augusto, 1981- 05 July 2007 (has links) Orientador: Ulf Friedrich Schuchardt / Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Quimica / Made available in DSpace on 2018-08-08T20:51:24Z (GMT). No. of bitstreams: 1 Steffen_RafaelAugusto_M.pdf: 657835 bytes, checksum: efc464baf50683cc652c38220caa0600 (MD5) Previous issue date: 2007 / Resumo: Testou-se a atividade catalítica de duas aluminas, uma comercial (Fluka) e outra obtida via processo sol-gel, na oxidação Baeyer-Villiger utilizando cicloexanona como substrato e peróxido de hidrogênio como oxidante. Os catalisadores foram caracterizados por análise termo gravimétrica e difração de raios-X e os produtos identificados por cromatografia a gás e ressonância magnética nuclear de H e C. Os catalisadores mostraram-se altamente eficientes nas oxidações utilizando-se peróxido de hidrogênio aquoso 70 % (m/m) como oxidante, com rendimentos em e-caprolactona superiores a 75 % com seletividade de 98 %. As condições foram otimizadas, sendo 20 h de reação, 90 ± 2 ºC, razão molar de peróxido de hidrogênio:cicloexanona 8:1 e 300 mg de alumina, utilizando-se acetato de etila como solvente, com o sistema acoplado a um Dean-Stark para remoção da água do meio reacional. Os catalisadores apresentaram menores rendimentos na presença de água, perdendo a seletividade já na primeira reciclagem. Porém, nas reações em que se fez a remoção de água os catalisadores mantiveram a mesma atividade catalítica após cinco ciclos. Testes em que se comparou o desempenho do catalisador na epoxidação e na oxidação Baeyer-Villiger mostraram que existe competição entre os sítios ativos dessas reações. Com base nos resultados obtidos propô-se um mecanismo no qual a reação poderá ocorrer por dois caminhos distintos / Abstract: Two aluminas, one comercial (Fluka) and the other obtained by sol-gel methods, were used as catalysts for the Baeyer-Villiger oxidation using cyclohexanone as substrate and hydrogen peroxide as oxidant. The catalysts were characterized by X-ray diffraction and thermogravimetric analysis and the oxidation products were analysed by gas chromatography and H and C nuclear magnetic resonance. Both aluminas showed to be high efficient catalysts for Baeyer- Villiger oxidation with aqueous hydrogen peroxide 70 % (w/w), reaching yields as high as 75 % for the e-caprolactona with selectivity of 98 %. The optimized conditions was found to be 20 h of reaction at 90 ± 2 ºC, with peroxide:cyclohexanone molar ratio of 8:1, 300 mg of catalyst, ethyl acetate as solvent and a Dean-Stark system coupled for water removal. The catalysts showed lower selectivity in the presence of water, losing the activity at the first recycling test. However, when the water was removed, the catalysts presented the same activity in 5 consecutive cycles. Tests comparing the alumina as epoxidation and Baeyer-Villiger oxidation catalyst showed that there is a competition between the catalytic sites for these reactions. Based on the results obtained we were able to propose a mechanism, admitting that the reaction could occur by two different pathways / Mestrado / Quimica Organica / Mestre em Química Alumina Oxidação Água oxigenada Baeyer-Villiger oxidation Alumina Hydrogen peroxide Cyclohexanone
5	Exploration de la biodiversité des Baeyer-Villiger monooxygénases et découverte d'activités originales sur les cétones α,β-insaturées / Exploration of the Baeyer-Villiger Monooxygenase diversty and discovering of new activities on α,β-unsaturated ketones Reignier, Thomas 18 December 2014 (has links) Ce travail traite de l’exploration de la biodiversité des Baeyer-Villiger MonoOxygénases (BVMOs) : des enzymes utilisées en biocatalyse pour la production de lactones optiquement pures à partir de cétones. Pour mettre à bien cet objectif nous avons réalisé, en association avec le Génoscope d’Evry, une sélection de plusieurs centaines d’enzymes couvrant une forte diversité génétique. Après clonage et criblage à haut débit sur plus de vingt substrats différents nous avons obtenus plus de 90 nouvelles BVMOs. Avec ce résultat nous avons triplé le nombre de BVMOs connues dans la littérature. Dans un second temps nous avons étudié l’activité de certaines de ces nouvelles enzymes sur les cétones α,β-insaturées (ou enone), Ces substrats sont peu étudiés en biocatalyse et, lors de la réaction chimique, aboutissent à la formation de nombreux sous-produits. Deux enzymes d’O.batsensis et de P. lavamentivorans se sont révélées être actives aboutissant à la production d’ene-lactone et d’enol-lactone respectivement. La conversion de certaines enones chirales a abouti à des lactones présentant un fort excès énantiomérique.Nous avons ensuite étudié la régio-sélectivité de 35 enzymes issues du criblage sur une série de cétones aliphatiques acycliques. Alors que la formation de l’ester méthylique est très rare, nous avons obtenu des résultats très variés pour la formation de l’ester éthylique allant jusqu’à 80%. Le travail de thèse s’est terminé par le développement d’une cascade enzymatique sur la production d’ester à partir d’alcool secondaire. La cascade implique deux enzymes : une Alcool Déshydrogénase et une BVMO. La cascade est à la fois fonctionnelle et est très efficace. / - Réaction de Baeyer-Villiger Lactones insaturées Enones Criblage à haut débit Enzymes Baeyer-Villiger oxidation Unsaturated lactones High throughput screening Enzymes Enone
6	Synthesis Of Chiral Lactones Via The Baeyer Villiger Oxidation Of Cyclic Aromatic Acetoxy Ketones Novel Annulation Reactions Of 2-propynyl-1,3-dicarbonyl Compounds To Form Pyrroles Addition Of Acyl Phosphonates To Diethyl Cyanophosphonate (depc) Aybey, Asuman 01 December 2008 (has links) (PDF) Chiral Baeyer-Villiger (BV) oxidation of cyclic ketones allows rapid access to asymmetric lactones as valuable intermediates in organic chemistry and frequently encountered precursors in enantioselective synthesis. In the first part, BV oxidation of functionalized ketones, especially cyclic &amp / #61537 / -hydroxy and acetoxy ketones is described which could be a straightforward route to the &amp / #61537 / -hydroxy lactones and &amp / #61537 / -hydroxyalkanoic acid derivatives. The &amp / #61537 / -acetoxylation of indanone, tetralone and chromanone derivatives by using Mn(OAc)3 followed by the enzyme catalyzed kinetic resolution of acetoxy ketones gives both of the enantiomers of &amp / #61537 / -acetoxy ketones in good chemical and optical yields. The Bayer-Villiger oxidation of &amp / #61537 / -acetoxy ketones with m-CPBA, CF3SO3H, and CH2Cl2, at rt gives the corresponding lactones without racemization. The phenyl moiety migrates selectively in order to form lactones. The mild hydrolysis of lactones affords phenolic &amp / #61537 / -hydroxycarboxylic acid derivatives. Because of the high importance of pyrrole derivatives which exist in the structure of many natural products possessing biological activity beside their valuable feature of being versatile building blocks in organic synthesis and important starting materials for various synthetic transformations, a convenient method for the synthesis of 1,2,3,5-tetrasubstituted pyrrole derivatives starting from 1,3,-dicarbonyl compounds throuh acid catalyzed cyclization reaction is presented in the second part of the thesis. Alkylation of 1,3-dicarbonyl compound with propargyl bromide followed by one step cyclization with the introduction of primary amines in the presence of catalytic amount of trifluoroacetic acid (TFA) affords the corresponding pyrrole derivatives in high yields. The third part of the thesis describes the cyano-phosphorylation of various alkyl and aryl phosphonates in the presence of diethyl cyanophosphonate (DEPC) as the phosphorylating agent under the promotion of the KCN catalyst. Reaction of acyl phosphonates with DEPC forms the phosphonocyanohydrin-O-phosphates which are the important starting materials of quaternary &amp / #945 / -hydroxy carboxylic acid and phosphonate containing &amp / #946 / -aminoalcohol derivatives. QD Organic Chemistry 241-441
7	Baeyer-Villiger monooxygenases d'Acinetobacter : réactions biocatalysées et dédoublements cinétiques dynamiques / Baeyer-Villiger monooxygenases of Acinetobacter strains : biocatalyzed reactions and dynamic kinetic resolution Hamze, Khalil 24 April 2014 (has links) L'oxydation de Baeyer-Villiger (BV) par voie enzymatique est une méthode efficace pour obtenir de lactones sous forme énantiomériquement pure. Les Baeyer-Villiger Monooxygénases (BVMO) sont ainsi capables d'oxyder de nombreux substrats avec une stéréospécificité remarquable.Nous avons recherché de nouvelles enzymes dans le génome de deux souches appartenant au genre Acinetobacter, A. baylyi ADP1 et A. baumannii AYE. Six gènes ont été clonés dans E. coli. Leur profil de substrat a été étudié en utilisant des cellules entières de ce microorganisme recombinant comme biocatalyseur. Quatre enzymes ont montré une spécificité de substrat similaire, avec une préférence pour les petites cétones cycliques et pour les substituants aryliques. Une de ces enzymes a permis le Dédoublement Cinétique Parallèle Régiodivergent d'une bicyclohepténone et la désymétrisation de cyclobutanones benzyliques avec, dans chaque cas, une énantiosélectivité intéressante car conduisant à des énantiomères rarement obtenus par réaction de BV enzymatique.Dans une seconde partie, des Dédoublements Cinétiques Dynamiques, associant réaction de BV enzymatique et racémisation in situ ont été réalisés avec des cellules entières d'E. coli produisant la Cyclohexanone Monooxygenase (CHMO) issue d'A. calcoaceticus. La racémisation de cyclohexanones α-substituées, habituellement difficilement racémisables, a été assurée par l'emploi de solutions tampons à base de sels de phosphate ou de glycine. Les -caprolactones correspondantes ont été isolées sous forme d'esters méthyliques hydroxylés quasi énantiopurs avec des rendements compris entre 70 et 80%. / Enzyme-mediated Baeyer-Villiger oxidation is nowadays largely recognized as an efficient method to obtain highly optically active lactones. An increasing number of Baeyer-Villiger Monooxygenases from various sources has been found to oxidize a large range of substrates with a good to excellent stereospecificity.Firstly, in order to enlarge the scope of these biotransformations, the genome of two strains of the Acinetobacter genus, A.baylyi ADP1 and A.baumannii AYE was explored. Six genes were expressed in E. coli and the substrate profile of each enzyme was studied using whole cell biotransformations. Four enzymes showed close substrate specificity with a preference for small cyclic ketones and for arylic substituents. Interestingly, one enzyme led to a Kinetic Parallel Regiodivergent Resolution of a bicycloheptenone and desymmetrisation of benzylic cyclobutanones in an enantiocomplementary manner when compared to the most of already known enzymes.The second part of this work describes the implementation of Dynamic Kinetic Resolution processes combining enzymatic BV oxidation and in situ racemization of α-substituted cyclohexanones to afford corresponding lactones in more than 50% yield. Cyclohexanone Monooxygenase (CHMO) from another Acinetobacter strain, A. calcoaceticus, was selected and the reactions were carried out with whole cells of producing CHMO E. coli strain. The racemization of α-substituted cyclohexanones, usually slowly racemized under basic conditions, was ensured by the use of containing phosphate salts or glycine buffer solutions. Several corresponding -caprolactones were isolated after methylation as enantiopure hydroxy methyl esters in 70-80% yield. Baeyer-Villiger Monooxygénases Dédoublement cinétique dynamique Synthèse de lactones Chimie verte Biocatalyse Acinetobacter Baeyer-Villiger Monooxygenases Asymmetric Baeyer-Villiger oxidation Dynamic kinetic resolution Lactones synthesis Green chemistry Biocatalysis Acinetobacter
8	Die Iromycine und das Collinolacton: Synthese mikrobieller Naturstoffe aus Streptomyces sp. / The Iromycins and the Collinolacton: synthesis microbial natural products from Streptomyces sp. Shojaei, Heydar 02 May 2007 (has links) No description available. 540 Chemie Mathematics and Computer Science Totalsynthese des Naturstoffs Iromycin A Inhibitor der NO-Synthase 6-Brommethylpyron terminales Alkin Carboaluminierungsreaktion Alkenyldimethylalane Lithiumalkenyltrialkylalanate Alanate Kreuzkupplungsprodukt Iromycinvorläufer Übergangsmetall-katalysierte Reaktionen Collinolacton enantioselektive Aldol-Reaktion diastereoselektive Diels-Alder-Reaktion Oxy-Cope-Umlagerung Baeyer-Villiger-Oxidation Hexadienal Mukaiyama-Aldoladdition NO synthase inhibitor 6-brommethylpyron terminal alkyn carboalumination reaction alkenyldimethylalane lithium alkenyltrialkylalanate alanate crosscuppling product precursor of iromycin transition metals catalysisreactions collinolacton enantioselectiv aldol reaction diastereoselectiv Diels-Alder reaction Oxy-Cope rearrangement Baeyer-Villiger oxidation Hexadienaldehyd Mukaiyama aldol addition 35.50 35.52 35.60 SU 000: Organische Chemie SUJ 270

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