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Dissertations / Theses on the topic 'Heterocycles'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Locke, Julie Myree, University of Western Sydney, College of Health and Science, and School of Biomedical and Health Sciences. "Synthetic and conformational studies of hexahydropyrimidines and related heterocycles." THESIS_CHS_BHS_Locke_J.xml, 2003. http://handle.uws.edu.au:8081/1959.7/638.

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This thesis explores the synthesis and conformational behaviour of hexahydropyrimidines and related heterocycles, with particular emphasis on 5- hyrdohexahydropyrimidines. The conformational behaviour of these compounds was investigated using dynamic NMR spectroscopy, molecular modelling techniques and X-ray crystal structure analysis. The conformational behaviour of 5- hyrdohexahydropyrimidine, hexahydropyrimidine and their analogous oxygen compounds as well as a series of hexahydropyrimidines with various exocyclic substituents, were examined. The preferred conformations of all these compoun

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2

Sheldrake, Paul J. "Complexed heterocycles." Thesis, University of Oxford, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.386622.

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3

Locke, Julie Myree. "Synthetic and conformational studies of hexahydropyrimidines and related heterocycles." Thesis, View thesis, 2003. http://handle.uws.edu.au:8081/1959.7/638.

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This thesis explores the synthesis and conformational behaviour of hexahydropyrimidines and related heterocycles, with particular emphasis on 5- hyrdohexahydropyrimidines. The conformational behaviour of these compounds was investigated using dynamic NMR spectroscopy, molecular modelling techniques and X-ray crystal structure analysis. The conformational behaviour of 5- hyrdohexahydropyrimidine, hexahydropyrimidine and their analogous oxygen compounds as well as a series of hexahydropyrimidines with various exocyclic substituents, were examined. The preferred conformations of all these compoun

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4

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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5

Bedford, Simon Bernard. "Synthesis of oxygen heterocycles." Thesis, University of Nottingham, 1993. http://eprints.nottingham.ac.uk/13159/.

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In chapter one, the various methods of generating benzenoid orthoquinodimethanes are discussed and approaches to their heterocyclic analogues are also reviewed. The utility of ortho-quinodimethanes in organic synthesis is highlighted by examples of both inter- and intramolecular Diels-Alder cycloadditions as the key steps in the total synthesis of naturally occurring polycyclic systems. In chapter two, work aimed at the development of a rapid synthetic entry to heterocyclic quinodimethanes starting from ortho-methyl heterocyclic carboxylic acids is presented. To this end, the dianion of 3-meth

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6

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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7

Yow, Shu Hui. "Claisen rearrangements of heterocycles." Thesis, Imperial College London, 2012. http://hdl.handle.net/10044/1/9491.

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This thesis is divided into five chapters. Chapter 1 is a review of de-aromatisation processes achieved by sigmatropic rearrangement. It covers the two main types of sigmatropic rearrangements, namely [2,3]- and [3,3]-rearrangement. Chapter 2 introduces the decarboxylative Claisen rearrangement (dCr) reaction and the aim to investigate its viability on more elaborate heterocyclic substrates is discussed. Research efforts into the synthesis of 3-sulfonyl-6-alkenyl-1,4-dioxan-2-ones are detailed. Chapter 3 discusses the extension of this methodology towards N-alkylmorpholinones. The first sectio

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8

Hollis, Stephen James. "Heterocycles in peptide chemistry." Thesis, Open University, 2000. http://oro.open.ac.uk/54180/.

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The synthesis of 5-membered heterocyclic rings that bear both amine and carboxylic acid functional groups has been investigated using a 1,3-dipolar cycloaddition reaction strategy. These molecules, on incorporation into a chain of amino acids, have the potential to restrict the conformational freedom of the peptide. Cycloaddition of a nitrile oxide, derived from a Boc-protected naturally-occurring a-amino acid, with a pyrrolidine en amine led to a Boc-protected 3-aminoalkylisoxazole amino acid ester. The nitrogen and carbon termini of this isoxazole were coupled to other a-amino acids. Analysi

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9

Waterfield, P. C. "Novel C-organostannyl heterocycles." Thesis, University of Bath, 1988. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.384138.

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10

Esteves, Carlos Henrique Alves. "Palladium-catalysed enolate arylation in the synthesis of aromatic heterocycles and substituted heterocycles." Thesis, University of Oxford, 2017. https://ora.ox.ac.uk/objects/uuid:b69e1a46-3275-4d77-a043-7207e7c93d59.

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<b>Chapter 1. Introduction</b> A literature background on the early development of the Pd-catalysed cross-coupling reactions and the later discovery of the enolate arylation reaction is presented. In the second part, the literature on pyruvate chemistry is explored, focusing on enantioselective transformations and the synthesis of α-arylated pyruvate derivatives. The final part presents reported protocols on the synthesis of β-carboline, isoquinoline and indole esters, from the classical approaches to the more recent methodologies based on metal catalysed transformations. <b>Chapter

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11

Reddy, Y. S. V. "Enantioselective construction of six - membered heterocycles and carbocycles using N - heterocyclic carbene (NHC) - organocatalysis." Thesis(Ph.D.), CSIR-National Chemical Laboratory, Pune, 2016. http://dspace.ncl.res.in:8080/xmlui/handle/20.500.12252/2079.

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12

Fletcher, Kristin A. "Mobile Order Theory as Applied to Polycyclic Aromatic Heterocycles." Thesis, University of North Texas, 1997. https://digital.library.unt.edu/ark:/67531/metadc278994/.

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Experimental mole fraction solubilities of benzil, thianthrene, trans-stilbene, thioxanthen-9-one, diphenyl sulfone and dibenzothiophene sulfone are determined in pure noncomplexing and complexing solvents. Predicted solubility values are calculated for benzil, thianthrene, trans-stilbene and thioxanthen-9-one using expressions derived from Mobile Order theory. Large deviations between experimental and predicted solubilities in alcohol solvents exist, therefore optimized solute - solvent association constants are determined. Previously measured thianthrene solubilities in five binary alkane +

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13

Dunford, Damian Gordon. "Novel synthesis of N-heterocycles." Thesis, Cardiff University, 2010. http://orca.cf.ac.uk/54138/.

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In a continuation of studies into metal-catalysed 5-endo-dig cyclisations, we investigated their application to the synthesis of a range of N-heterocycles: indoles, pyrazoles and pyrroles. The second chapter describes an investigation of the application of silver(I) cyclisation methodology to the synthesis of 1,2-disubstituted indoles. Our methodology was applicable to a range of functional groups in both positions, allowing for terpenes, alkenes, aromatic, alkyl and alcohol substituents in position two. Additionally, a range of nitrogen protecting groups were tolerated, including sulfonamides

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14

Richmond, Craig J. "Applications for imidazophenanthridine-based heterocycles." Thesis, University of Glasgow, 2009. http://theses.gla.ac.uk/1406/.

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The physical properties and reactivity of 2,3-dihydro-1H-imidazo[1,2-f]phenanthridinium cations (DIPs) and analogous heterocycles have been investigated. The adapted syntheses developed were applied to a range of aryl amines and more elaborate substrates, such as bifunctional aminoquinolinium cations and amino functionalised polyoxometalates (POMs). 1,2,3,12b-tetrahydroimidazo[1,2-f]phenanthridines (TIPs), an intermediate in the 3-step cascade synthesis of DIPs, have also been isolated. Derivatisation of the TIP structure at the imidazo-N position enables control of the reactivity of the inter

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15

Gosby, Katherine M. P. "Osmium mediated formation of heterocycles." Thesis, University of Oxford, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.496899.

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16

Pheko, Tshepo. "Stereoselective synthesis of oxygen heterocycles." Thesis, University of Bristol, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.658071.

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The thesis describes the use of y,8-unsaturated alcohol in cyclisations with various aldehydes under acidic conditions to fonn monocyclic and bicyclic heterocycles with good stereocontrol. 6-Phenylhex-5-en-2-01136 was prepared in 3 steps and 55% yield and reacted with prop anal ill the presence of oxygen· and nitrogen nucleophiles to give tri-substituted tetrahydropyrans. Interestingly 229 and 230 have an equatorial C-3 side chain whereas 232 and 235 is in axial. Furthennore reaction of 6-phenylhex-5-en-2-01 136 with aldehydes possessing aryl, nitrogen and oxygen tethered nucleophiles suitably

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17

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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18

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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19

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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20

McKnight, Michael Vincent. "Heterocycles as amine protecting groups." Thesis, University of Liverpool, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.328176.

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21

Billington, Helen. "Novel approaches to polycyclic heterocycles." Thesis, University of Liverpool, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.272632.

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22

Wilson, Ian. "Halogenated heterocycles for drug discovery." Thesis, Durham University, 2011. http://etheses.dur.ac.uk/863/.

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Within a number of industries, and particularly within the pharmaceutical industry, there is a desire for reliable, high yielding routes towards large numbers of valuable small molecules that allow a wide range of products to be synthesised. Heterocyclic compounds are particularly sought after as useful compounds, with an estimated 70% of pharmaceutical products being based on heterocyclic structures. A drawback of many traditional routes towards heterocyclic compounds is that the range of substituents that may be placed around the ring is limited. This is especially limiting if ring substitue

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23

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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24

Monzón, Díaz Gabriel Andrés. "Zincation of heterocycles and aryl nonaflates." Diss., lmu, 2012. http://nbn-resolving.de/urn:nbn:de:bvb:19-147520.

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25

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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26

Agocs, Lisa Lynn. "Design of bioactive chalcogenobismuth(III) heterocycles." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq24728.pdf.

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27

Reeves, Jonathan Robert. "Alkene epoxidation using small ring heterocycles." Thesis, Imperial College London, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.397377.

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28

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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29

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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30

Orr, Allan J. "A metathesis approach to aromatic heterocycles." Thesis, University of Oxford, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.433342.

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31

Mujtaba, Nadeam. "Homochiral heterocycles from Î²-amino esters." Thesis, University of Oxford, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.418480.

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32

Honey, Mark A. "A carbenoid approach to functionalised heterocycles." Thesis, University of Nottingham, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.556078.

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This Thesis describes the development of methodology towards an array of functionalised heterocycles from metal-catalysed carbenoid X-H insertion reactions. Chapter 1 introduces the concept of carbenoid chemistry, with carbenoid N- H, O-H and S-H insertion reactions being reviewed. Chapter 2 discusses various methods available for the synthesis of a- diazocarbonyl compounds, with the results and discussion section detailing the synthesis of numerous diazo-containing compounds which will be used throughout this Thesis. The introduction of Chapter 3 details selected literature examples of indole

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33

Lindsay-Scott, Peter J. "New osmium-catalysed routes to heterocycles." Thesis, University of Oxford, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.509979.

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34

Davies, Deiniol Hedd. "Synthesis and applications of Guanidine Heterocycles." Thesis, Bangor University, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.519556.

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35

Mann, Emma. "Novel free radical synthesis of heterocycles." Thesis, Loughborough University, 2001. https://dspace.lboro.ac.uk/2134/14589.

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The use of tri-n-butyltin hydride and an initiator to mediate free radical cyclisation as a synthetic organic process is well documented throughout the chemical literature. By using BU3SnH, and developing new 'catalytic' BU3SnH methods, many new heterocyclic compounds have been synthesised successfully. The search for new 'tin-free' radical reagents is important in order to provide a non-toxic alternative to tin. We have started initial studies on the replacement oftriorganotin hydrides with germanium analogues. An interesting number of reactions using BU3SnH do not give reduced products and h

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36

Benmansour, Hadjar. "Palladium catalysed reactions of halogenated heterocycles." Thesis, Durham University, 2001. http://etheses.dur.ac.uk/4948/.

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1- The synthesis of unusually substituted halo-fluoroheterocycles has been achieved. 2,4,6-Tribromo-3,5-difluoropyridine and 4-bromo-2,3,5,6-tetrafluoropyridine were prepared from pentafluoropyridine, aluminium bromide and hydrogen bromide Reactions with lithium halides allowed the preparation of 4-iodo-2,3,5,6- tetrafluoropyridine, 4-iodo-2,6-dibromo-3,5-difluoropyridine, 4-iodo-2,3,5,6- tetrafluoropyridine and 4-chloro-2,6-dibromo-3,5-difluoropyridine.2- Reactions of 2,4,6-tribromo-3, 5-difluoropyridine with nucleophiles showed that selective substitution at the C-F centre can be achieved us

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37

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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38

Simpson, Bryan Garth. "Reactions of heterocycles with phosphorus compounds." Thesis, Cardiff University, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.329647.

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39

Canfield, Lesley Mary. "Microbiological transformations of partially reduced heterocycles." Thesis, University of Portsmouth, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.358921.

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40

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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41

Hicks, Simon Richard John. "Synthesis and reactions of epoxy heterocycles." Thesis, University of Hertfordshire, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.365978.

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42

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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43

Hunter, Rupert Alexander. "Transition metal mediated synthesis of heterocycles." Thesis, University of Southampton, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.402426.

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44

Galan, A. A. "Novel routes to oxygen containing heterocycles." Thesis, University of Bristol, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.375386.

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45

Wood, Paul Thomas. "Phosphorus-sulphur and phosphorus-selenium heterocycles." Thesis, Imperial College London, 1988. http://hdl.handle.net/10044/1/47312.

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46

Mahy, William. "Catalytic synthesis and modification of heterocycles." Thesis, University of Bath, 2016. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.687323.

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The following thesis outlines work carried out during the past three years for the discovery and investigation of catalytic methodologies towards the synthesis and modification of heterocycles, namely cyclic carbamates, carbonates and their sulfur analogues. Chapter 1 summarises the current catalytic methods reported in the literature towards the synthesis and modification of functionalized 2-oxazolidinones. This introduction highlights the diverse range of methods and catalysts that have been developed and their scope and limitations. In addition the review highlights the importance of these

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47

Ducept, Pascal. "Synthesis of heterocycles using silyldiazocarbonyl compounds." Thesis, Imperial College London, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.271307.

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48

Wieting, Joshua Merlin. "Silanediol-Catalyzed Stereoselective Functionalization of Heterocycles." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1448891366.

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49

Yoshioka-Tarver, Megumi. "Benzotriazole intermediates for heterocycles and pharmaceuticals." [Gainesville, Fla.] : University of Florida, 2009. http://purl.fcla.edu/fcla/etd/UFE0041025.

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50

Bloxham, Jason. "The synthesis of novel linked heterocycles." Thesis, Loughborough University, 1996. https://dspace.lboro.ac.uk/2134/10441.

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Chapter 1 reviews the literature with regard to the synthesiS of substituted carbazoles via the cycloaddition reactions of indole-2,3-quinodimethanes and its equivalents with dienophiles. Particular attention is paid to the synthesis and reactions of pyrano[3A-b ]indol-3-ones. Chapter 2 describes the synthesis of a variety of linked indole-3-acetic acid derivatives, where the linkage is either through the indole nitrogen, the 2- position or the acetic acid residue in the 3-position. The preparation and subsequent Diels-Alder reactions of the derived linked pyrano[3,4-b]indol-3-ones are also de

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