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Dissertations / Theses on the topic 'Electrophilic cyclization'

Author: Grafiati

Published: 4 June 2021

Last updated: 3 February 2022

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1

Just, Ziwei W. "Synthesis of 2(3H)-furanones via electrophilic cyclization." [Ames, Iowa : Iowa State University], 2007.

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2

Demirci, Deniz. "Synthesis Of 4-phenylselenyl-1h-pyrazoles By Electrophilic Cyclization." Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613910/index.pdf.

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In this study, the synthesis of 5-ferrocenyl/aryl-4-(phenylselenyl)-1H-pyrazole derivatives was investigated since the integration of ferrocenyl and selenium moieties into pyrazole derivatives may increase their current biological activities. Initially, the starting propargyl aldehydes were synthesized from corresponding acetylenes. Subsequently, propargyl aldehydes were reacted with hydrazines to yield corresponding hydrazones. Then the in situ synthesized hydrazones were subjected to electrophilic cyclization with phenylselenyl chloride, which afforded 5-ferrocenyl/aryl-4-(phenylselenyl)-1H-

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3

Kesharwani, Tanay. "Studies in electrophilic cyclization, palladium migration and cationic polymerization." [Ames, Iowa : Iowa State University], 2008. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3330842.

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4

Worlikar, Shilpa Arvind. "Palladium-catalyzed and electrophilic cyclization approaches to carbocycles and heterocycles." [Ames, Iowa : Iowa State University], 2008. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3320129.

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5

Mehta, Saurabh. "Palladium-catalyzed and electrophilic cyclization approaches to important heterocycles and carbocycles." [Ames, Iowa : Iowa State University], 2009. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3389126.

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6

Karahan, Dag Fulya. "Synthesis Of 5-ferrocenyl-4-((4-nitrophenyl)sulfenyl)-1h-pyrazoles By Electrophilic Cyclization." Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613443/index.pdf.

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Pyrazoles have been intensely studied in the design and synthesis of biologically active agents because they display considerable medicinal activities. Recent studies have shown that integration of a ferrocenyl unit with structural features of pyrazoles can result in the formation of the new products with enhanced or/and unexpected biological activity since several ferrocene derivatives have already been illustrated to be active against a number of tumors. Therefore, we have investigated the electrophilic cyclizations of the hydrazones to afford 5-ferrocenyl-4-((4-nitrophenyl)sulfenyl)-substit

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7

Shah, Parin Ajay. "Synthesis of terpenoids using a tandem cationic cascade cyclization-electrophilic aromatic substitution reaction." Diss., University of Iowa, 2018. https://ir.uiowa.edu/etd/6639.

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The terpene and terpenoid family of compounds is considered to be the largest group of natural products. These compounds not only display great diversity in their structural features but are also known to have a multitude of biological activities including but not limited to anti-bacterial, anti-cancer, anti-inflammatory, and anti-HIV properties. Remarkably, all the terpenoids formed in nature come from two molecules viz. isopentenyl pyrophosphate and its isomer, dimethylallyl pyrophosphate both consisting of just five carbons but assembled in many ways. Nature utilizes highly efficient, enzym

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8

García, Barrado Alejandro. "New Methodologies for the Regio- and Stereoselective Electrophilic Cyanation of Alkynes." Doctoral thesis, Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2018. http://hdl.handle.net/11858/00-1735-0000-002E-E549-8.

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9

Karabiyikoglu, Sedef. "Synthesis Of Ferrocenyl Substituted Pyrazoles By Sonogashira And Suzuki-miyaura Cross-coupling Reactions." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/3/12612139/index.pdf.

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Pyrazoles constitute one of the most important classes of heterocyclic compounds due to their interesting chemical and biochemical features. Researchers have studied many pyrazole containing structures for almost over a century in order to investigate the various biological activities possessed by these molecules. A new and important trend in these studies is to produce ferrocenyl substituted pyrazoles since ferrocene attracts considerable interest in the research field of organometallic and bioorganometallic chemistry because of its valuable chemical characteristics like high stability, low t

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10

Trabulsi, Houssam. "Préparation d’iminolactones par cyclisation électrophile d’hydroxamates insaturés : étude de leurs propriétés." Thesis, Paris 11, 2011. http://www.theses.fr/2011PA112052.

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Au cours de nos différents travaux sur les réactions de cyclisations électrophiles diastéréosélectives 5-endo d’hydroxamates insaturés par l’hexafluorophosphate de bromo biscollidine (HBB). Nous avons constaté la formation d’imidates cycliques et nous avons mis en évidence un réarrangement lactames-imidates. Une fragmentation de type Beckman aboutissant à la formation d’une famille de cyano énones, anisi qu’une nouvelle formation d’imidates a été étudiée.Dans l’introduction générale, nous avons rapporté différents exemples d’halolactonisations électrophiles 5-endo et 5-exo, énantio et diastéri

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11

Yazici, Ceyda. "Synthesis Of 4-iodopyrazole Derivatives." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/3/12609750/index.pdf.

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Pyrazoles have been studied for over a century as an important class of heterocyclic compounds and continue to attract considerable interest due to the broad range of biological activities they possess. The electrophilic cyclization of the acetylenic hydrazones initiated by molecular iodine could provide new ways of synthesizing biologically active 4-iodopyrazole derivatives, which are important precursors for the synthesis of highly substituted pyrazole derivatives. For this reason, we investigated the synthesis of 4-iodopyrazole derivatives, such as 1-aryl- 5-alkyl/aryl-4-iodopyrazoles, star

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12

Kivrak, Arif. "Development Of New Methods For The Synthesis Of Pyrazoles, 4-iodopyrazoles, Isoxazoles And 1,2,4-oxadiazoles." Phd thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12612945/index.pdf.

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Synthesis of five-membered heteroaromatic compounds such as pyrazoles, isoxazoles and 1,2,4-oxadiazoles are important for pharmaceutical industry and material science due to their applications. Although there are many methods to prepare such compounds, new variants continue to appear since they exhibit a wide range of biological and medicinal activities. In this thesis, new methods were developed for the synthesis of 4-iodopyrazoles, pyrazoles, isoxazoles, 1,2,4-oxadiazoles and/or 1,2,4-oxadiazepines. In the first part of the study, electrophilic cyclization of &alpha<br>,&beta<br>-alkynic hy

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13

Melo, Diêgo de. "Síntese de derivados do bisabolol através de reações de heterociclização intramolecular promovidas por calcogenetos de organoíla." Universidade Federal de Goiás, 2017. http://repositorio.bc.ufg.br/tede/handle/tede/7192.

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Submitted by Luciana Ferreira (lucgeral@gmail.com) on 2017-04-20T11:29:02Z No. of bitstreams: 2 Dissertação - Diêgo de Melo - 2017.pdf: 12963482 bytes, checksum: 14979af9bcf3df3d1a038ba4bc54e354 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5)<br>Approved for entry into archive by Luciana Ferreira (lucgeral@gmail.com) on 2017-04-20T12:38:31Z (GMT) No. of bitstreams: 2 Dissertação - Diêgo de Melo - 2017.pdf: 12963482 bytes, checksum: 14979af9bcf3df3d1a038ba4bc54e354 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5)<br>Made available in DSpa

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14

Nunes, Marta Regina dos Santos. "Ciclização eletrofílica de compostos β-enamino carbonílicos e β-dicarbonílicos." Universidade de São Paulo, 2002. http://www.teses.usp.br/teses/disponiveis/46/46135/tde-18092018-160100/.

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Esta tese consiste do estudo de reações de ciclofuncionalização de compostos β-enamino carbonílicos e β-dicarbonílicos, contendo uma cadeia alquenílica nas posições α ou γ. Os eletrófilos empregados para este fim foram: iodo, brometo de fenilselenenila e tricloreto de p-metóxifeniltelurio. Os iodo-β-enamino ésteres e cetonas cíclicas, após desidroiodação mediada por base, levaram à formação dos correspondentes pirróis, indóis e aminobenzofuranos. A ciclização dos β-ceto ésteres e β-dicetonas levou a enol éteres e benzofuranos funcionalizados. Estes resultados

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15

Campbell, Matthew James Johnson Jeffrey Scott. "I. Mechanistic studies of a copper-catalyzed electrophilic amination of diorganozinc reagents reagents by O-benzoyl N,N-dialkylhydroxylamines II. Development of a 3-Exo-Dig cyclization for the preparation of vinylidene cyclopropanes III. Total synthesis of +-polyanthellin A." Chapel Hill, N.C. : University of North Carolina at Chapel Hill, 2009. http://dc.lib.unc.edu/u?/etd,2881.

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Thesis (Ph. D.)--University of North Carolina at Chapel Hill, 2010.<br>Title from electronic title page (viewed Jun. 23, 2010). "... in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the Department of Chemistry." Discipline: Chemistry; Department/School: Chemistry.

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16

Fu, Liang Verfasser], Meike [Akademischer Betreuer] Niggemann, and Dieter [Akademischer Betreuer] [Enders. "Aluminum or calcium-catalyzed electrophilic cyclizations of alkynes via vinyl cations / Liang Fu ; Meike Niggemann, Dieter Enders." Aachen : Universitätsbibliothek der RWTH Aachen, 2016. http://d-nb.info/1130326500/34.

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17

Fu, Liang [Verfasser], Meike Akademischer Betreuer] Niggemann, and Dieter [Akademischer Betreuer] [Enders. "Aluminum or calcium-catalyzed electrophilic cyclizations of alkynes via vinyl cations / Liang Fu ; Meike Niggemann, Dieter Enders." Aachen : Universitätsbibliothek der RWTH Aachen, 2016. http://d-nb.info/1130326500/34.

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18

Fu, Liang [Verfasser], Meike [Akademischer Betreuer] Niggemann, and Dieter [Akademischer Betreuer] Enders. "Aluminum or calcium-catalyzed electrophilic cyclizations of alkynes via vinyl cations / Liang Fu ; Meike Niggemann, Dieter Enders." Aachen : Universitätsbibliothek der RWTH Aachen, 2016. http://d-nb.info/1130326500/34.

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19

Köver, Andrea. "Stereoselective Synthesis of 2-Deoxyoligosaccharides.New Aprroaches to the Synthesis of Digitoxin and P-57." Doctoral thesis, Universitat Rovira i Virgili, 2008. http://hdl.handle.net/10803/9024.

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In the present work, a complete study for the synthesis of 2-deoxy-glycosides is described, applying<br/>a strategy previously developed in our group for the preparation of 2-deoxy-2-iodo-pyranoses. This<br/>strategy, that involves Wittig¨CHorner olefination from fully protected furanoses to give alkenyl sulfides,<br/>electrophilic¨Cinduced cyclization to furnish 2-deoxy-2-iodo-pyranosyl thioglycosides, gives access to a<br/>new type of glycosyl donor that can be used in glycosylation reactions of the desired glycosyl acceptors to<br/>give 2-deoxy-2-iodo-glycosides.<br/>This method is based, o

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20

Wang, Cheng-I., and 王振儀. "Synthesis of Poly-Aromatic Hydrocarbons by Electrophilic Cyclization." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/64949902812394114936.

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碩士<br>國立清華大學<br>化學系<br>94<br>The dissertation discusses the synthesis of poly-aromatic hydrocarbons through electrophilic cyclization using ICl complex. We have succeeded in using this method to synthesize spiro[4,5]trienone as well as the phenanthrene derivatives. Under this foundation, we design a set of simple synthesis procedure to synthesize the dibenzo[g,p]crysene derivatives. This process requires a few steps and with excellent yields. We also investigated on the physical properties of these dibenzo[g,p]crysene derivatives, which includs UV, PL, CV, and quantum efficiency. We found the

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21

Chen, Xin-Fen, and 陳信芬. "The study of electrophilic and radical cyclization of ▫-cyanoamines." Thesis, 1990. http://ndltd.ncl.edu.tw/handle/80182851178156795092.

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22

Yue, Dawei. "Palladium and electrophilic cyclization approaches to carbo- and heterocyclic compounds /." 2004.

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23

Shen, Ho-Chuan, and 沈鶴全. "Highly efficient synthesis of 4H-3,1-benzoxazines by the electrophilic cyclization reaction." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/34612469090743242515.

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碩士<br>高雄醫學大學<br>醫藥暨應用化學研究所<br>98<br>4H-3,1-Benzoxazine derivatives displays important biological activities in many research announcements, that have been used as fungicidal,herbicidal, anticonvulsant, anti-inflammatory agents and as DNA-binding antitumor agents. In this thesis ,we studied design intramolecular 6-endo-dig electrophilic cyclization of N-(2-Phenylethynyl-phenyl)-benzamide compounds by iodine reagents. The reaction afforded 4H-3,1-benzoxazin derivatives in good yields with various functional groups.

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24

Kuo, Tsung-hui, and 郭宗輝. "Electrophilic Induced Cyclization of Methyl 2-(6-substitued 3-hexen-1,5-diynyl)benzoate :Synthesis ofIsocoumarins." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/90270310828851368489.

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碩士<br>高雄醫學大學<br>藥學研究所碩士在職專班<br>92<br>Treatment of methyl 2-(6-substitued 3(Z)-hexen-1,5-diynyl) benzoates with four equivalent of iodine in CH2Cl2 at room temperature gave 4-iodo-3-((1E,3E)-4-substituted-3,4-diiodo-1,3-butadienyl)isocou- marins in 47- 68 % yields. When the amount of iodine was reduced to one equivalent, the reaction gave 4-iodo-3-((E)-4-substituted-1-buten-3-ynyl) isocoumarins in 57- 67 % yields. Other iodinating agents are also introduced in this reaction, similar results were observed when ICl and NIS were employed in this reaction.

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25

Lee, Donna Carol. "Vinylcyclopropanols as terminators in electrophilic cyclizations." 1988. http://catalog.hathitrust.org/api/volumes/oclc/18434710.html.

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Thesis (Ph. D.)--University of Wisconsin--Madison, 1988.<br>Typescript. Vita. II. Development and synthetic applications of the palladium catalyzed cyclization of enynes and diynes. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

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26

Pelletier, Guillaume. "Synthèse stéréosélective de pipéridines et activation électrophile chimiosélective d’amides en présence de dérivés de la pyridine." Thèse, 2013. http://hdl.handle.net/1866/10512.

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L’importance des produits naturels dans le développement de nouveaux médicaments est indéniable. Malheureusement, l’isolation et la purification de ces produits de leurs sources naturelles procure normalement de très faibles quantités de molécules biologiquement actives. Ce problème a grandement limité l’accès à des études biologiques approfondies et/ou à une distribution sur une grande échelle du composé actif. Par exemple, la famille des pipéridines contient plusieurs composés bioactifs isolés de sources naturelles en très faible quantité (de l’ordre du milligramme). Pour pallier à ce problè

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27

lin-bhui-chang and 林煇章. "Synthesis of oxa-cage compounds by using electrophiles induced cyclization reaction." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/59594302043831024380.

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28

Lu, Wen-Te, and 盧文德. "Nucleophile, Electrophile and Transition Metals Promoted Cyclization of Enediynes and Related Moleculars." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/29144063972123193838.

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博士<br>高雄醫學大學<br>藥學研究所博士班<br>94<br>In this dissertation, we focus on the cyclization reactions of enediynes. In the first part of this dissertation, we extended the anionic cycloaromatization of enediyne to the synthesis of the benzo[b]naphtha[1,2-a]furans. It was found that treatment of 2-[(3Z, 7Z)-hexadeca-3,7-diene-1,5,9-triynyl]phenyl tert-butyldimethyl ether with K2CO3 in N, N-dimethyl formaldehyde (DMF) containing two equivalents of methanol refluxing temperature gave 10-hexylbenzo[b]naphtha[1,2-a]furan in 33% yield. On the other hand, reaction of 2-alkynylbenzonitriles with aryl iodides

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