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Dissertations / Theses on the topic 'Guaianes'

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Published: 4 June 2021

Last updated: 4 February 2022

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1

Giannini, Audrey. "Synthèse générale, efficace et stéréosélective de Guaianes et guaianolides naturels." Université Joseph Fourier (Grenoble), 2005. http://www.theses.fr/2005GRE10045.

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Ce travail décrit une approche générale aux composés naturels possédant le squelette bicyclo[5. 3. 0]décane, ainsi que la synthèse totale efficasse et stéréosélective de guaianes et guaianolides. La stratégie développée repose principalement sur deux réactions : une cycloaddition [2+2] du dichlorocétène chimio-, régio- et stéréosélective sur le méthylcycloheptatriène, suivie d'une expansion de cycle au diazométhane. Une déshydrohalogénation conduit alors à une alpha-chlorotriénone Une étude approfondie des transformations de cet intermédiaire clé a permis la synthèse de la (+/-)-1alpha-7alpha-

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2

Calancea, Mihaela. "Approche Générale et Efficace des Terpénoïdes Possédant le Squelette Bicyclo[5. 3. 0]décane : Synthèse de Sesquiterpènes (Aromadendranes, Guaianes et Tri-nor-guaianes) et Approche des Diterpènes." Université Joseph Fourier (Grenoble), 2008. http://www.theses.fr/2008GRE10105.

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La cycloaddition [2+2] du dichlorocétène sur des cycloheptatriènes monosubstitués conduit, après expansion de cycle au diazométhane et déshydrohalogénation, de façon régio- et stéréosélective, à des alpha-chlorotriénones. Ces intermédiaires se sont déjà avérés des synthons particulièrement attractifs pour la synthèse totale de produits naturels possédant le squelette bicyclo[5. 3. 0]décane. Une cyclopropanation régio- et diastéréosélective avec l'ylure de soufre sur l'alpha-chlorotriénone nous a permis d'élaborer une approche générale des aromadendranes ainsi que la synthèse totale de la (±)-c

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3

Sainte, Luce Banchelin Thomas. "Approche des pseudoguaianolides et sysynthese efficace de guaianes et de guaianolides : synthèse de l’acide (±) -péchuéloique et de la (±) - achalensolide." Université Joseph Fourier (Grenoble), 2008. http://www.theses.fr/2008GRE10193.

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La cycloaddition [2+2] chimio-, régio- et stéréosélective du dichlorocétène sur le méthylecycloheptatriène conduit, après expansion de cycle au diazométhane et déshydrohalogénation, à des a -chlorotriénones. Ces intermédiaires se sont avérés des synthons particulièrement attractifs et efficaces pour la synthèse totale de produits naturels (terpénoïdes) possédant le squelette bicyclo5. 3. 0]décane. L'utilisation de différents organométalliques et de cétènes-acétals, lors d'additions conjuguées, nous a permis d'élaborer une approche stéréoséléctive des pseudoguaianolides, une famille très abonda

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4

Valot, Gaëlle. "Extending the diversity of privileged natural product motifs : Synthesis of a library of resorcylic acid lactones and studies towards the guaianes and pseudoguaianes." Strasbourg, 2011. https://publication-theses.unistra.fr/public/theses_doctorat/2011/VALOT_Gaelle_2011.pdf.

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Les macrolides du résorcinol présentant une fonction cis-enone se sont révélés être de puissants et irréversibles inhibiteurs de protéines kinases, des enzymes impliquées dans toutes les transductions de signaux dont le dysfonctionnement est à l’origine de pathologies telles que le cancer, les inflammations ou les maladies neurodégénératives. Attiré par leur activité biologique, notre laboratoire a développé une voie synthétique pour ces composés, basée sur la technologie des tags fluorés. La première partie de ma thèse a consisté à appliquer cette synthèse à l’élaboration d’une chimiothèque d

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5

Silva, Sheila Alice Gomes da. "Negros em Guaianases: cultura e memória." Pontifícia Universidade Católica de São Paulo, 2016. https://tede2.pucsp.br/handle/handle/12907.

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Made available in DSpace on 2016-04-27T19:31:13Z (GMT). No. of bitstreams: 1 Sheila Alice Gomes da Silva.pdf: 1542239 bytes, checksum: 7be236912998b1e610b52fdea790f670 (MD5) Previous issue date: 2016-02-19<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>This work centrally aimed at reflecting on the black presence at Guaianases, an east-side neighborhood located at São Paulo. In order to do so, the starting point of this study relied on the cultural practices and memories of the local black population. Chronologically situated between the years 1930 and 1960, the research t

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6

Barbosa, Maria Lucia. "O Brasil tirânico em Os guaianãs: estudo da tetralogia de Benito Barreto." Universidade Federal de Minas Gerais, 2010. http://hdl.handle.net/1843/ECAP-86XJZJ.

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O escritor mineiro Benito Barreto, em sua obra Os guaianãs, realiza uma incursão num período da História brasileira marcado pela consolidação de um Estado tirânico e opressor. E é a intercessão dialógica entre História e Literatura uma das responsáveis pelas narrativas aqui estudadas. Assim, por meio do entrelaçamento entre contexto e texto ficcional, Os guaianãs apresenta-se como espaço que confirma a tensão de duas grandes narrativas: a História e a Nação. Esta dissertação busca observar os traços que conformam a poética própria de Benito Barreto e investigar de que forma o autor promove a a

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7

Leyhane, Andrew John. "Cyclobutadiene cycloadditions : applications toward the synthesis of functionalized oxepines and guaiane natural products." Thesis, Boston College, 2008. http://hdl.handle.net/2345/1360.

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8

NOGUEIRA, Antônio Henrique Silva. "O estranhamento na arte da Oficina Guaianases (1974-1995)." Universidade Federal de Pernambuco, 2014. https://repositorio.ufpe.br/handle/123456789/13948.

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Submitted by Luiza Maria Pereira de Oliveira (luiza.oliveira@ufpe.br) on 2015-05-15T15:22:32Z No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) DISSERTAÇÃO Antonio Henrique Silva Nogueira.pdf: 2483871 bytes, checksum: 07783bab8a95ef6a1ff252b5e7a7036f (MD5)<br>Made available in DSpace on 2015-05-15T15:22:32Z (GMT). No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) DISSERTAÇÃO Antonio Henrique Silva Nogueira.pdf: 2483871 bytes, checksum: 07783bab8a95ef6a1ff252b5e7a7036f (MD5) Previous issue date: 20

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9

Castilho, Edimilsom Peres. "A praça dos trabalhadores de Guaianazes: periferia de São Paulo." Pontifícia Universidade Católica de São Paulo, 2007. https://tede2.pucsp.br/handle/handle/13029.

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Made available in DSpace on 2016-04-27T19:31:39Z (GMT). No. of bitstreams: 1 EDIMILSOM PERES CASTILHO.pdf: 17946921 bytes, checksum: add48e6e69a93c8e3467ec84bb8962e0 (MD5) Previous issue date: 2007-12-06<br>Conselho Nacional de Desenvolvimento Científico e Tecnológico<br>This research intends to understand the social and historical constitution of the squares in our cities as a category of urban landscape, using as basis to this study the analysis of the social appropriation of the square in Guaianases, in the suburbs of São Paulo. The Guaianases square, which from the year 2001 to 2003 went

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10

He, Jing. "Intramolecular Cycloaddition of Cyclobutadiene: Applications toward Functionalized 5-7-5 Tricyclic Ring Systems and Guaiane Natural Products." Thesis, Boston College, 2012. http://hdl.handle.net/2345/2923.

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Thesis advisor: Marc L. Snapper<br>Intramolecular cycloadditions of cyclobutadiene provide rapid access to rigid polycyclic systems with high strain energies and unique molecular geometries. Further functionalization of these systems followed by strain-release fragmentation provides great opportunities to construct fused-medium-ring architecture, which are very common in natural products but challenging to achieve efficiently. An intermolecular cyclopropanation/acid-mediated rearrangement strategy has been previously developed to access the 5-7 bicyclic ring systems in a highly stereospecific

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11

Rama-Corredor, Óscar. "Biomarcadors paleoclimàtics a la conca de la Guaiana (Atlàntic tropical occidental)." Doctoral thesis, Universitat Politècnica de Catalunya, 2017. http://hdl.handle.net/10803/461683.

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The main objective of this thesis is the study of a marine sediment core located in front of French Guiana (7°48’75’’N i 53°0’80’’W -1233m bsl and 39m length), in northern South America. The last 415,000 years were studied at high resolution by identification and quantification of organic fossil compounds. Two types of biomarkers were used: continental (n-alkanes and n-alcohols) which are synthesized by higher plants and marine (C37 alkenones) which are synthesized by phytoplankton (some species of Hapthophyceae). The former provide information on precipitation and vegetation changes in the

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12

Guo, Lei [Verfasser], and Bernd [Akademischer Betreuer] Plietker. "Catalytic enantioselective total synthesis of picrotoxane alkaloids and guaiane sesquiterpene englerins A and B / Lei Guo ; Betreuer: Bernd Plietker." Stuttgart : Universitätsbibliothek der Universität Stuttgart, 2019. http://d-nb.info/1191182754/34.

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13

Lando, Alisa. "The Design and Synthesis of a First Aid Smart Fabric and Synthetic Studies Towards the Total Synthesis of Torilin." Thesis, Boston College, 2013. http://hdl.handle.net/2345/3235.

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Thesis advisor: Marc L. Snapper<br>Chapter 1: The design of a novel first aid smart fabric that is linked to a biologically active molecule through an event specific cleavable linker is described. Successful functionalization of a cellulose filter paper fabric mimic and the synthesis of a linker which is potentially selectively cleavable in the presence of blood have been achieved. Chapter 2: Synthetic studies towards the total synthesis of Torilin, a sesquiterpene guaiane natural product with interesting biological activities are described. The synthesis of the hydroazulene core of Torilin is

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14

Marineau, Jason Joseph. "New Applications of Cyclobutadiene Cycloadditions: Diversity and Target Oriented Synthesis." Thesis, Boston College, 2010. http://hdl.handle.net/2345/1741.

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Thesis advisor: Marc L. Snapper<br>Cyclobutadiene cycloadditions provide rapid access to rigid polycyclic systems with high strain energy and unusual molecular geometries. Further functionalization of these systems allows entry into unexplored chemical space. A tricarbonylcyclobutadiene iron complex on solid support enables exploration of these cycloadditions in a parallel format amenable to diversity oriented synthesis. Modeling of the cycloaddition transition states with density functional calculations provides a theoretical basis for analysis of the regioselectivity observed in generation o

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15

Correia, Maria Aparecida Antero. "Educação infantil de 0 a 3 anos: um estudo sobre demanda e qualidade na região de Guaianazes, São Paulo." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/48/48134/tde-02072013-142346/.

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A pesquisa realizada na região de Guaianazes, periferia da cidade de São Paulo, teve por objetivo compreender como são implementadas as políticas públicas, aqui as de Educação Infantil, particularmente as dirigidas às crianças de 0 a 3 anos de idade. Para tanto, foram realizadas entrevistas com diretores, professoras, coordenadoras pedagógicas e mães de duas creches da região, denominadas centros de educação infantil, além da diretora regional de educação. Foram ainda realizadas doze horas de observação em cada um dos centros. Um estudo documental completou o conjunto de recursos necessário pa

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16

Gambera, Giovanni. "Studies toward the synthesis of the guaianolide skeleton : an intramolecular hetero Diels Alder approach and a carbonyl ene approach." Thesis, Loughborough University, 2006. https://dspace.lboro.ac.uk/2134/25173.

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This thesis describes the efforts towards the synthesis of the guaiane-6,12-olide skeleton, which characterises the guaianolide family of bioactive natural compounds. Two approaches have been investigated: the intramolecular hetero Diels Alder (IMHDA) reaction and the intramolecular carbonyl ene reaction. This thesis has been divided in three sections: the first part gives a general background about the guaianolides, the second section describes the synthetic approaches we investigated and, finally, the third section reports the experimental details. The first section gives a brief overview ab

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17

Safont, Crespo Elisabet. "Flora and vegetation of the Guayana highlands : past dynamics, global warming and conservation guidelines = Flora i vegetació de les Terres de Guayana : dinàmica del passat, escalfament global i directrius de conservació." Doctoral thesis, Universitat de Barcelona, 2016. http://hdl.handle.net/10803/386460.

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This thesis is aimed at the study of the flora and vegetation of the Guayana Highlands (GH), a set of -50 table mountains (called tepuis) located in the Guayana Shield of northern South America. Special emphasis is put on the potential upward migration of vascular plants as a response to global warming and the suggestion of conservation strategies. The tepui summits contain exceptional diversity and endemism of vascular plants, with more than 2400 known species, of which 30% would be endemics. In this study, the results of the Altitudinal Range Displacement analysis suggest that 30-50% of the

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18

Calancea, Mihaela. "Approche Générale et Efficace des Terpénoïdes Possédant le Squelette Bicyclo[5.3.0]décane : Synthèse de Sesquiterpènes (Aromadendranes, Guaianes et Tri-nor-guaianes) et Approche des Diterpènes." Phd thesis, 2008. http://tel.archives-ouvertes.fr/tel-00331873.

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La cycloaddition [2+2] du dichlorocétène sur des cycloheptatriènes monosubstitués conduit, après expansion de cycle au diazométhane et déshydrohalogénation, de façon régio- et stéréosélective, à des alpha-chlorotriénones. Ces intermédiaires se sont déjà avérés des synthons particulièrement attractifs pour la synthèse totale de produits naturels possédant le squelette bicyclo[5.3.0]décane. Une cyclopropanation régio- et diastéréosélective avec l'ylure de soufre sur l'alpha-chlorotriénone nous a permis d'élaborer une approche générale des aromadendranes ainsi que la synthèse totale de la (±)-cyc

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19

Pardeshi, Vijendra H. "Enantiospecific Synthesis Of Guaianes And Tricyclic Ring Systems Of Elisabethins And Dumsins." Thesis, 2010. http://etd.iisc.ernet.in/handle/2005/1248.

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One area of natural product synthesis which has been heavily investigated in the last eight decades is the total synthesis of terpenoids. Among terpenoids, the presence of a great deal of stereochemical complexity in combination with a variety of functionalities makes sesquiterpenes challenging targets to the synthetic chemists. As a result synthetic activity in this area continues to flourish. The thesis entitled “Enantiospecific Synthesis of Guaianes and Tricyclic Ring Systems of Elisabethins and Dumsins’’ describes the studies directed towards the synthesis of the guaiane sesquiterpenes and

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20

Mendes, Sofia Alexandra Carreiro. "Study of the anti-inflamatory and antitumoral activities of the fruits of Pittosporum undulatum Vent." Master's thesis, 2012. http://hdl.handle.net/10451/11232.

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Tese de mestrado, Química Farmacêutica e Terapêutica, Universidade de Lisboa, Faculdade de Farmácia, 2012<br>The main objective of this dissertation was to search for new anti-inflammatory compounds from Pittosporum undulatum (Pittosporacea) fruits, contributing, in this way, to the scientific validation of their use in the traditional medicine of Azores archipelago. In order to achieve this goal, the fruits of Pittosporum undulatum, collected in Terceira Island, were extracted with methanol, and the residue was successively partitioned with nhexane, dichloromethane, ethyl acetate and n-butan

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