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Dissertations / Theses on the topic 'Nitrogen Heterocyclest'

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1

Hemmings, Philippa Rachel. "Nitrogen heterocycles from sugars." Thesis, University of Oxford, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.314823.

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2

Slater, Jonathan. "Cyclometallated nitrogen heterocycles - metallomesogens." Thesis, University of Warwick, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.269196.

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3

Treacy, Alan Bernard. "Nitrogen heterocycles in asymmetric synthesis." Thesis, Queen's University Belfast, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.361310.

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4

Jones, A. D. "Novel syntheses of nitrogen heterocycles." Thesis, University of Nottingham, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.388287.

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5

McGuigan, H. "Synthetic studies on nitrogen heterocycles." Thesis, University of Glasgow, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.375469.

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6

Burnett, Duane Arthur. "Synthesis of nitrogen containing heterocycles /." The Ohio State University, 1986. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487264603219377.

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7

Qaddo, Akram. "Enantiospecific nitrogen heterocycle synthesis." Thesis, University of Sheffield, 2016. http://etheses.whiterose.ac.uk/15791/.

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8

Austin, Carolyn A. "Diversity-Based Synthesis of Nitrogen Heterocycles." Thesis, University of Glasgow, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.484942.

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Brief investigations were carried out towards the synthesis of 2,4-disubstituted quinolines and 2,6-disubstituted piperidines using titanium alkylidene chemistry, but these were unsuccessful. A route towards the diversity based stereoselective synthesis of 2-substituted azepane derivatives was explored via titanium alkylidene chemistry. Thioacetals i were reacted with low valent titanium(II) species ii to produce titanium(IV) alkylidenes that were reacted with resin-bound esters iii. Cleavage of the resulting enol ethers led to a small library of amino ketones iv, but reductive amination to gi
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9

Jones, Matthew Lloyd. "Radical rearrangements of nitrogen-containing heterocycles." Thesis, University of Oxford, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.289342.

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10

Anwar, Muhammad. "Synthesis of highly functionalised nitrogen heterocycles." Thesis, University of Oxford, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.441057.

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11

Coates, Brian. "The stereoselective synthesis of nitrogen heterocycles." Thesis, Queen's University Belfast, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.334524.

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12

Barker, S. J. "Nitrogen heterocycles by flash vacuum pyrolysis." Thesis, University of Liverpool, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.383390.

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13

Kemp, Mark Ian. "Zirconocene mediated synthesis of nitrogen heterocycles." Thesis, University of Southampton, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.242197.

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14

Wongtap, Hathaichanuk. "A radical approach to nitrogen heterocycles." Thesis, University of Warwick, 1999. http://wrap.warwick.ac.uk/109826/.

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The generation of amidyl radical and carbon centred radicals using both tin hydride and non-tin hydride methods are described. The effect of the nitrogen substituent upon the stereoselectivity of amidyl radical cyclisations onto the alkyl side chain using the tin hydride method was investigated The O-benzoyl hydroxamic acid derivatives were chosen as precursors for these radicals. The results indicated that the tram isomers were the major isomers from the cyclisation reaction. The greatest diastereoselectivity was found when the nitrogen substituent was a methoxy group. However, the cyclisatio
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15

Dodson, N. J. "New annelation methods for nitrogen heterocycles." Thesis, University of Bath, 1987. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.377591.

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16

Feraldi-Xypolia, Alexandra. "Synthesis of trifluoromethylated nitrogen-containing heterocycles." Thesis, Paris 6, 2017. http://www.theses.fr/2017PA066444/document.

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L’introduction d’un atome de fluor sur un composé organique peut avoir une influence importante sur les propriétés chimiques et physico-chimiques de ce composé, ainsi qu’à son activité biologique. Par ailleurs, les hétérocycles représentent une famille de composés intéressante pour l’industrie pharmaceutique et agrochimique avec 70% de nouvelles molécules bioactifs possédant un motif hétérocyclique. Ainsi, le développement des méthodes de synthèse permettant la formation des hétérocycles trifluorométhylés, représente un défi en chimie organique. Dans le cadre de nos travaux, nous avons dans un
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17

Preuss, Kathryn Elvia. "Sulfur nitrogen heterocycles as charge transfer materials." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape3/PQDD_0018/NQ53510.pdf.

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18

Donnelly, Shileen Agnes. "Electrochemical and related reactions of nitrogen heterocycles." Thesis, Queen's University Belfast, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.282130.

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19

Sunose, Mihiro. "Asymmetric methods for functionalisation of nitrogen heterocycles." Thesis, University of Bristol, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.297768.

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20

Molloy, Brendan. "Nitrogen heterocycles as potential metal sequestering agents." Thesis, Manchester Metropolitan University, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.369438.

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21

Stevenson, Elizabeth. "Pyrolytic syntheses of fused bridgehead nitrogen heterocycles." Thesis, University of Edinburgh, 1999. http://hdl.handle.net/1842/13016.

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There are two distinct areas of work in this thesis, both involving pyrolytic syntheses of nitrogen heterocycles. The first area of work extends a previous synthesis of 1<I>H</I>-azepin-3(2<I>H</I>)-ones to examples with a fused ring in the 1,2-position. The synthetic strategy for such azepinones involved preparation of enaminals incorporating cyclic amines with different ring sizes, then condensation of the enaminals with Meldrum's acid (2,2-dimethyl-1,3-dioxane-4,6-dione). Flash Vacuum Pyrolysis (F.V.P.) of the Meldrum's acid derivative gave the fused azepinone with dicyclopentadienone forme
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22

Alkhuraiji, Waleed. "Synthesis and properties of bridged nitrogen heterocycles." Thesis, University of Leicester, 2007. http://hdl.handle.net/2381/29990.

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The synthesis of derivatives of the parent 7-azabicyclo[2.2.1]heptyl system was achieved. The synthesis of the novel 1-methyl-7-azabicyclo[2.2.1]hepta-2,5-diene was accomplished. The carbonyl group at position C2 of the 7-azabicyclo[2.2.1]heptyl system was synthesized. The work was extended to include the synthesis of derivatives of the 1,4-dimethyl-7-azabicyclo[2.2.1]heptyl system. Investigation of the synthesis of epibatidine was not successful.;The work was extended to include a wide range of urethanes and amines of 7-azabicyclo[2.2.1]heptyl system where no 15N NMR studies had been reported
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23

Foster, Radleigh. "Tandem reactions for nitrogen heterocycle syntheses." Thesis, University of Oxford, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.669897.

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24

Hill, Thomas J. "The synthesis of densely functionalised enantiopure nitrogen heterocycles." Thesis, University of Oxford, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.442812.

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25

McElhinney, Alison Dorothy. "Studies towards the novel synthesis of nitrogen heterocycles." Thesis, University of Leeds, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.414250.

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26

Hitchings, G. J. "The synthesis of fused heterocycles containing bridgehead-nitrogen." Thesis, University of York, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.383838.

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27

Tyas, Richard G. "New pyrolytic routes to fused bridgehead nitrogen heterocycles." Thesis, University of Edinburgh, 2004. http://hdl.handle.net/1842/11477.

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Under flash vacuum pyrolysis (FVP) conditions <i>C-</i>unsubstituted imidazole <i>N-</i>propenoate ester derivatives give 78±5:22±5 mixtures of pyrrolo[1,2-<i>a</i>]amidazol-5-one and pyrrolo[1,2<i>-c</i>]imidazol-5-ones. The mechanism involves a cascade process initiated by 1,5-sigmatropic shift of the substituent. Substitution of the imidazole <i>N</i>-propenoate ester at the 2-position or 4,5-positons of the heterocycle allows exclusive access to the pyrrolo[1,2-<i>c</i>]imidazol-5-one and pyrrolo[1,2-<i>a</i>]amidazol-5-one systems respectively upon FVP. Ring-opening of the pyrrolo[1,2-<i>
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28

Guy, Collette S. "New approaches to nitrogen heterocycles via radical cyclisations." Thesis, University of Warwick, 2013. http://wrap.warwick.ac.uk/63951/.

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The work presented in this thesis focuses on the use of radical cyclisations to synthesise nitrogen heterocycles. Chapter 1 provides an introduction to radical cyclisations and the development of conditions over the past couple of decades. It also gives an introduction to atropisomerism, a phenomenon present in a number of cyclisation precursors, and how this has been exploited to achieve chirality transfer in the cyclisation of acrylanilides. Chapter 2 describes investigations into the effects of alkene substitution on the barrier to rotation about the N-alkenyl bond in enamides. A range of e
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29

Siddle, James Spencer. "Metal-catalysed cross-coupling reactions of nitrogen heterocycles." Thesis, Durham University, 2010. http://etheses.dur.ac.uk/617/.

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Described herein are copper-catalysed N-C heteroarylations of benzimidazole, 1-methylbenzimidazolone, imidazole and pyrrole. The products of these reactions then undergo palladium-catalysed C-C cross-couplings with aryl or heteroarylboronic acids under Suzuki-Miyaura conditions to provide a rapid entry to tris(hetero)aryl scaffolds comprising two or three N-heterocyclic rings. The sequential N-C and C-C couplings can be performed in a one-pot process. 1,5-Di(hetero)arylated-pyridin-2(1H)-one derivatives have been synthesised in good yields starting from (2-fluoro-5-pyridyl)boronic acid. The se
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30

Lunga, Mayibongwe J. "A medicinal chemistry study in nitrogen containing heterocycles." Thesis, Rhodes University, 2018. http://hdl.handle.net/10962/63521.

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31

Cutter, Amanda C. "Step-efficient asymmetric approaches to saturated nitrogen heterocycles." Thesis, University of Southampton, 2012. https://eprints.soton.ac.uk/354552/.

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An imino-aldol reaction between phenyl chlorovalerate and a variety of (S)-tert butylsulfinimines was developed which gave consistently high diastereoselectivites of up to 95:5:0:0 dr and yields of up to 87%. In several cases, single crystal X-ray crystallography confirmed the stereochemistry of the major products to be syn. Successful isolation of these syn imino-aldol products allowed them to be converted to a variety of enantiopure saturated nitrogen heterocycles. Natural products (–)-epilupinine ((–)-1.71) and (–)-tashiromine ((–)-1.72) were successfully synthesised in enantiopure form in
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32

Anderson, Lesley Marion. "Kinetic and NMR studies of some nitrogen heterocycles." Thesis, University of St Andrews, 1990. http://hdl.handle.net/10023/15295.

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The work carried out in this thesis involves the investigation of some reactions of heterocyclic compounds by a wide range of spectroscopic and kinetic techniques. Chapter 1 describes several methods, including stopped-flow spectrophotometry, high pressure kinetics and MNDO calculations, which are used to analyse the mechanism of the reaction of imidazole with diazonium ions. Chapter 2 describes the use of the temperature-jump technique to follow the extremely fast protonation of pyrroles. Diazonium ions are further investigated in Chapter 3 which examines the structure of p-nitrobenzenediazon
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33

Barker, Graeme. "New lithiation methodologies to 2-substituted nitrogen heterocycles." Thesis, University of York, 2011. http://etheses.whiterose.ac.uk/1549/.

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This thesis describes the development of methodologies for lithiation-trapping and lithiation-arylation of N-Boc heterocycles in the position α to nitrogen as well as in situ infra-red spectroscopic monitoring of lithiation reactions and the application of lithiation-arylation in total synthesis. Chapter 2 details the use of in situ infra-red spectroscopy to monitor the lithiation of N-Boc pyrrolidine, N-Boc piperidine, N-Boc homopiperidine, an N-Boc acetal piperidine, N-Boc-Nʹ-benzyl piperazine, N-Boc-Nʹ-i-Pr imidazolidine and an O-alkyl carbamate in diethyl ether using s-BuLi and the diamine
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34

El, Sair Romain. "Synthesis and reaction of novel nitrogen bridgehead heterocycles." Thesis, University of Brighton, 2009. https://research.brighton.ac.uk/en/studentTheses/8cad54f8-1272-4edb-9aa0-22c787d80e92.

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β-Carboline derivatives display a wide range of interesting biological activities from intercalation to enzyme inhibition and anticancer to psychological activity. β- Carboline compounds are frequently isolated from natural products in the β- carbolinium form and thus contain a bridgehead quaternary nitrogen.
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35

Peacock, Joanne Linda. "Synthesis of nitrogen heterocycles via amidyl radical cyclisations." Thesis, University of Warwick, 1998. http://wrap.warwick.ac.uk/108362/.

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Intramolecular radical additions to alkenes have become increasingly popular in synthetic organic chemistry as a means for constructing cyclic arrays. The majority of work has focused upon the reactions of carbon-centred radicals but nitrogen radical cyclisations can provide an effective route to forming a variety of N-heterocycles. Cyclisation of nucleophilic aminyl radicals can be problematic due to their potential reversibility so the more electrophilic amidyl radicals were used for this investigation. O-Benzoyl hydroxamic acid derivatives proved to be suitable precursors for forming the de
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36

Filik, Robert Paul. "Synthesis of nitrogen containing heterocycles via radical cyclisation." Thesis, University of Warwick, 2000. http://wrap.warwick.ac.uk/111023/.

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O-benzoyl hydroxamic acids were found to be suitable precursors for the generation of amidyl radicals. A stereoselectivity study was performed to investigate the 5-exo cyclisations of the amidyl radicals formed. Hence a range of methyl and phenyl 2- substituted N-alkyl-Af-benzoyloxy-pent-4-enamides were synthesised and cyclised using tributyltin hydride and AIBN. A small preference for the Irons isomer was observed in all cases (10-36%) with the phenyl pendant series giving the highest selectivities. The observed Irons isomer was not that expected by current theories (Beckwith and Houk model).
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37

Rai, B. "Synthesis of some bioactive oxygen and nitrogen heterocycles." Thesis(Ph.D.), CSIR-National Chemical Laboratory, Pune, 1993. http://dspace.ncl.res.in:8080/xmlui/handle/20.500.12252/3080.

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38

Turner, Peter G. "Synthesis of six membered heterocycles containing nitrogen or oxygen." Thesis, University of Oxford, 2005. https://ora.ox.ac.uk/objects/uuid:58979b1b-59ba-4834-8140-1397afd51aff.

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Six-membered heterocycles containing nitrogen and oxygen are prevalent in natural products and pharmaceutical drugs; hence efficient synthesis of these motifs is of great benefit. This thesis describes the successful rearrangements of 5-membered heterocycles containing nitrogen and oxygen through to the corresponding 6-membered compounds. <strong>Chapter 1 - Project Conception</strong> This section outlined the project conception and aims. <strong>Chapter 2 - Radical Ring-Expansions</strong> This section contains an introduction to the radical mediated ring-expansions, which firstly focused on
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39

Saxty, Gordon. "Bifunctional silanes for cation-mediated synthesis of nitrogen heterocycles." Thesis, Imperial College London, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.398935.

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40

Henry, Neil. "From β-amino alcohols to highly functionalised nitrogen heterocycles." Thesis, University of Liverpool, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.426127.

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41

Qadir, Maryiam. "Transition-metal catalysed synthesis of medium-sized nitrogen heterocycles." Thesis, King's College London (University of London), 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.415464.

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42

Crosby, Stuart Richard. "Asymmetric syntheses of saturated oxygen and nitrogen containing heterocycles." Thesis, University of Bristol, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.341503.

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43

Parkin, Ivan Paul. "Reactions in liquid ammonia : metalla-sulphur/selenium-nitrogen heterocycles." Thesis, Imperial College London, 1989. http://hdl.handle.net/10044/1/47610.

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44

Kwong, Wai Sze Alice. "'High' temperature lithiation-trapping of nitrogen and oxygen heterocycles." Thesis, University of York, 2016. http://etheses.whiterose.ac.uk/16229/.

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This thesis describes some novel aspects of the lithiation-trapping of nitrogen and oxygen heterocycles, including a systematic study of new methodologies at temperature above ‒78 °C and the use of the sustainable solvent, 2-MeTHF, as an alternative to Et2O and THF. Chapter 2 describes a detailed exploration of the s-BuLi-mediated lithiation-trapping of N-Boc heterocycles (pyrrolidine, piperidine, piperazine and azepane) using different conditions (diamine, solvent, temperature and time). For N-Boc pyrrolidine, two new high temperature lithiation conditions were optimised: (i) 0 °C for 5 sec i
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45

Drouhin, Pauline. "Copper(II)-mediated oxidative coupling routes to nitrogen-heterocycles." Thesis, University of York, 2015. http://etheses.whiterose.ac.uk/9095/.

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Nitrogen-containing heterocycles have attracted considerable attention owing to their prevalence in numerous natural substances as well as their extensive applications in biology and pharmacology. In recent years, great efforts have been devoted to the elaboration of novel synthetic methodologies for the construction of N-heterocycles such as oxindoles and indoles. Reported in 2009 by the Taylor group, access to oxindole scaffolds has been successfully demonstrated via a copper(II)-mediated oxidative coupling approach. Following the same principle, the extension of this method to the formation
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46

Deshpande, S. R. "Synthetic studies in bioactive nitrogen, oxygen and sulfur heterocycles." Thesis(Ph.D.), CSIR-National Chemical Laboratory, Pune, 1991. http://dspace.ncl.res.in:8080/xmlui/handle/20.500.12252/2997.

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47

Huestis, Malcolm P. "Transition Metal-Catalyzed Preparation and Functionalization of Nitrogen-Containing Heterocycles." Thesis, University of Ottawa (Canada), 2009. http://hdl.handle.net/10393/28662.

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The formation of carbon-carbon bonds is the single most fundamentally important operation in synthetic organic chemistry. Arguably, the aldol and Diels-Alder reactions stand as the most significant advances in forging linkages between carbons of an sp3-hybridized nature. Beginning in the early 1970s, seminal advances were made with respect to formation of carbon-carbon bonds between sp2 centers. These transformations, termed "cross-coupling" reactions, have undoubtedly changed the way synthetic organic chemistry is carried out, rendering the synthesis of carbon-carbon sp2 linkages a relatively
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48

Peng, Hao. "Investigations toward metal-free hydroamination approaches to aromatic nitrogen heterocycles." Thesis, University of Ottawa (Canada), 2010. http://hdl.handle.net/10393/28874.

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Metal-free hydroamination approaches were investigated to afford aromatic nitrogen heterocycles. Several substrates were synthesized to test different sequences such as 6-endo-dig and 6-exo-dig cyclization. The desired reactivity was observed for each of the desired routes, which were discussed in Chapter 2. More research is needed for optimization in the future.* *Please refer to dissertation for diagrams.
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49

Illesinghe, Jayamini P. M. "Synthesis and use of nitrogen heterocycles in metal mediated reactions." Monash University, School of Chemistry, 2004. http://arrow.monash.edu.au/hdl/1959.1/9637.

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50

Harwood, Simon Jonathan. "Novel approaches to the synthesis of oxygen and nitrogen heterocycles." Thesis, University of Newcastle Upon Tyne, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.388133.

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