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Dissertations / Theses on the topic 'Alkaloids Pyrroles. Organic compounds'

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Published: 4 June 2021

Last updated: 1 February 2022

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1

Zhang, Yanan. "Approaches to the total synthesis of the lamellarins and related natural products." Diss., Online access via UMI:, 2005.

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2

Lee, Sze-ming. "An investigation into novel synthetic routes for 3h-pyrroles /." [Hong Kong : University of Hong Kong], 1989. http://sunzi.lib.hku.hk/hkuto/record.jsp?B12561915.

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3

李思明 and Sze-ming Lee. "An investigation into novel synthetic routes for 3h-pyrroles." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1989. http://hub.hku.hk/bib/B31209257.

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4

Chiu, Pak-kan. "Isolation of hydroxypyrrolines in the Paal-Knorr reaction; and the synthesis and properties of 3H-phrroles carrying an ester or nitrile group at C-3 /." [Hong Kong : University of Hong Kong], 1988. http://sunzi.lib.hku.hk/hkuto/record.jsp?B12428553.

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5

楊小雯 and Siu-man Yeung. "The synthesis and reactions of 3H-pyrroles bearing methyl and aryl groups." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1991. http://hub.hku.hk/bib/B31210119.

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6

Contla, Hector Luna. "Cis-arenediols as versatile chiral synthons in the synthesis of prostaglandins, cyclitols, carbohydrates, and alkaloids /." This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-07282008-134713/.

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7

Sandrin, Franco. "Lewis acid catalyzed reactions of 1-benzyl-2, 5-bis (trimethylsiloxy) pyrrole." Thesis, McGill University, 1985. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=66047.

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8

Khan, Ashna Ashneen. "Cascade approaches towards the synthesis of Daphnioldhanin A alkaloid : a thesis submitted to the Victoria University of Wellington in fulfilment of the requirements for the degree of Master of Science in Chemistry /." ResearchArchive@Victoria e-Thesis, 2008. http://hdl.handle.net/10063/818.

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9

George, Rosemary. "Synthesis and conformational studies of indolizines." Thesis, Rhodes University, 1994. http://hdl.handle.net/10962/d1005032.

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The present investigation has involved a kinetic and mechanistic study of the thermal cyclization of 3-acetoxy-3-(2-pyridyl)-2-methylenepropanoate esters and related compounds to 2-substituted indolizines. Substrates for the kinetic study were prepared via the Baylis-Hillmann reaction of pyridine-2-carboxaldehydes with acrylate esters, acrylonitrile and methyl vinyl ketone. The resulting hydroxy compounds were then acetylated to afford the acetoxy derivatives, thermal cyclization of which gave the corresponding 2-substituted indolizines. The cyclization reactions was followed using 'H NMR spec

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10

Contla, Hector Luna. "cis-Arenediols as versatile chiral synthons in the synthesis of prostaglandins, cyclitols, carbohydrates, and alkaloids." Diss., Virginia Tech, 1992. http://hdl.handle.net/10919/38900.

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11

Zhu, Koudi. "Model Studies Towards the Total Synthesis of Lyconadin A via An Acyl Radical Cascade Reaction." Diss., CLICK HERE for online access, 2006. http://contentdm.lib.byu.edu/ETD/image/etd1364.pdf.

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12

Igdir, A. Cigdem. "Reinvestigation Of The Synthetic And Mechanistic Aspects Of Manganese(iii) Acetate Mediated Reactions Synthesis Of 1,2,4-trisubstituted Pyrroles Via Amination / Annulation Reactions Of Chloroenones With Chiral Amine Compounds." Phd thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/12607643/index.pdf.

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The first part of the thesis presents the reinvestigation of the synthetic and mechanistic aspects of manganese (III) acetate mediated reactions. The main concern about this subject was to perform a &cent<br>- acetoxylation reactions of enones and saturated systems in shorter reactions times and higher yields than the ones known in literature reproducibly. Although successful a &cent<br>-acetoxylation of a great variety of substrates have been reported so far, there are some problems associated with the use of Mn(OAc)3. Considering that there are not many simple methods for the direct acetoxyl

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13

Aybey, Asuman. "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)." Phd thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/3/12610293/index.pdf.

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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<br>#61537<br>-hydroxy and acetoxy ketones is described which could be a straightforward route to the &amp<br>#61537<br>-hydroxy lactones and &amp<br>#61537<br>-hydroxyalkanoic acid derivatives. The &amp<br>#61537<br>-acetoxylation of indanone, tetralone and chromanone derivatives by using Mn(OAc)3 fol

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14

Kutz, Sebastian K. "Regioselektive Synthese substituierter Carbazol-1,4-chinone." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-200963.

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Die Ziele dieser Arbeit waren die Darstellung der Naturstoffe Murrayachinon-B–E und Pyrayachinon-A–C, sowie die Synthese einiger nicht natürlicher, potentiell anti-Tuberkulose-aktiver Carbazole und Carbazolchinone. Für die Darstellung der aus der Pflanze Murraya euchrestifolia Hayata isolierten Naturstoffe wurden verschiedene synthetische Herangehensweisen untersucht: Die Transformation eines 7 Hydroxycarbazolchinons in die Zielverbindungen gelang nicht, ebenso wie die Syntheseroute über eine trioxygenierte Vorstufe. 7-Methoxy-3-methyl-1-tosyloxycarbazol (A) ließ sich jedoch in einer Ausbeut

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15

Lemin, David. "Synthèse d'analogues des ligands naturels de récepteurs nicotiniques et purinergiques." Doctoral thesis, Universite Libre de Bruxelles, 2004. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/211158.

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Cette thèse s’inscrit dans le cadre de l’étude de la relation structure-activité d’analogues de ligands naturels de récepteurs nicotiniques et purinergiques. Ce travail se divise en deux parties.<p><p>Dans la première partie de cette thèse, nous avons réalisé la synthèse d’analogues de la 11-homosédinone, alcaloïde isolé de la plante Sedum acre, qui présente une activité agoniste sur différents récepteurs nicotiniques du système nerveux central. Les différents analogues ont été synthétisé par application de la méthoxylation anodique pour introduire succesivement deux substituants en postion 2

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16

Mthembu, Siyanda Thabani. "Enaminones in the synthesis of azabicyclic models for alkaloids." Thesis, 2008. http://hdl.handle.net/10539/5725.

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The purpose of this project was to investigate whether methodology developed in these laboratories for preparing 5/6 and 6/6 azabicyclic systems with bridged head nitrogen can be extended to 7/6, 8/6, 9/6 and 13/6 azabicyclic systems. The methodology entails the use of enaminones as central to the formation of the azabicyclic systems. The synthetic route adopted began with the Beckmann rearrangement reaction and/or the Schmidt reaction of cyclic ketones to make lactams, which were then thionated by Curphy or Brillon procedures. The Michael reaction of NH thiolactams with tert-butyl acr

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17

Scalzullo, Stefania Margherita. "Synthesis of lamellarin alkaloid analogues from enaminone precursors." Thesis, 2014.

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The synthesis of alkaloids from enaminones has been used extensively in the University of the Witwatersrand’s organic chemistry laboratories. In this thesis enaminone precursors are one of the main ways of accessing lamellarin analogues. The lamellarin alkaloids are an important family of marine alkaloids, owing to their vast biological properties. A brief background to marine alkaloids and their general potential is given, followed by a review of lamellarin alkaloids, their structural and biological properties and some of the major syntheses carried out over the past few years. Two novel f

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18

Leboho, Tlabo Caiphus. "Novel syntheses of 5- and 7- azaindole derivatives." Thesis, 2014.

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This thesis describes the application of the Sonogashira coupling reaction to access a variety of 5-and 7-azaindoles derivatives. The background chapter paints a picture about the importance of indole-containing compounds and azaindole-containing compounds. In this first chapter, discovery, synthesis, properties and reactivity of indole and azaindoles were explained.

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19

Cheesman, Penelope Sue. "The synthesis of 3,5-disubstituted indolizidines." Thesis, 1996. http://hdl.handle.net/10539/22411.

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A dissertation submitted to the Faculty of Science, University of the Witwatersrand, Johannesburg, in fulfilment of the requirements for the degree of Master of Science. January 1996.<br>Aspects of the literature of the ant venom alkaloid monomorine I and its stereoisomers were reviewed. Racemic 5-butyl-2-pyrrolidinone was synthesised in two steps from methyl acrylate and 1-nitropentane, A thionation step yielded 5-butylpyrrolidine-2-thione. The Michael addition reaction between 5-butylpyrrolidine-2-thione and ethyl crotonate proceeded with difficulty to form a separable mixture of dias

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20

Prior, Allan M. "The use of hydroamination in the attempted synthesis of ant alkaloid 223H (xenovenine)." Thesis, 2008. http://hdl.handle.net/10413/163.

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The ability to construct C-N bonds is of great importance to organic chemists as exemplified by the vast number of natural products, pharmaceutical agents and fine chemicals that contain such linkages. An atom efficient C-N bond forming reaction namely hydroamination has attracted much interest to date due to its ability in forming amine, imine and enamine functionality. The scope of this project involved the attempted synthesis of a biologically active and nitrogen containing pyrrolizidine alkaloid isolated from cryptic thief ants and poison dart frogs namely 223H (xenovenine). The method of

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21

"Progress towards the synthesis of Indolizidine alkaloid 223AB." Thesis, 2008. http://hdl.handle.net/10413/167.

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It has been shown that alkaloids from various sources are vital as lead compounds in medicinal research and thus also the efficient synthesis of these. With the goal of developing a general synthetic route that can potentially access pyrrolizidine, indolizidine, quinolizidine and possibly lehmizidine alkaloid skeletons, a modified route that has been shown to produce pyrrolizidines was employed towards the synthesis of indolizidine alkaloid 223AB. Within this synthesis, a 6-endo-dig hydroamination-cyclization step was attempted for construction of the bicyclic system. For this purpose, a selec

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22

Li, Yang. "Tandem intramolecular photocycloaddition-retro-Mannich fragmentation as a route to indole and oxindole." Thesis, 2012. http://hdl.handle.net/1957/28312.

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Irradiation of a tryptamine linked through its side-chain nitrogen to an alkylidene malonate residue results in an intramolecular [2 + 2] cycloaddition to the indole 2,3-double bond. The resultant cyclobutane undergoes spontaneous retro-Mannich fission to produce a spiro[indoline-3,3-pyrrolenine] with relative configuration defined by the orientation of substituents in the transient cyclobutane. The novel tandem intramolecular photocycloaddition- retro-Mannich (TIPCARM) sequence leads to a spiropyrrolidine which is poised to undergo a second retro-Mannich fragmentation [TIPCA(RM)₂] that expels

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23

Kutz, Sebastian K. "Regioselektive Synthese substituierter Carbazol-1,4-chinone." Doctoral thesis, 2015. https://tud.qucosa.de/id/qucosa%3A29425.

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Abstract:

Die Ziele dieser Arbeit waren die Darstellung der Naturstoffe Murrayachinon-B–E und Pyrayachinon-A–C, sowie die Synthese einiger nicht natürlicher, potentiell anti-Tuberkulose-aktiver Carbazole und Carbazolchinone. Für die Darstellung der aus der Pflanze Murraya euchrestifolia Hayata isolierten Naturstoffe wurden verschiedene synthetische Herangehensweisen untersucht: Die Transformation eines 7 Hydroxycarbazolchinons in die Zielverbindungen gelang nicht, ebenso wie die Syntheseroute über eine trioxygenierte Vorstufe. 7-Methoxy-3-methyl-1-tosyloxycarbazol (A) ließ sich jedoch in einer Ausbeut

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24

Li, Jian-yuan. "The modification of brucine derivatives as chiral ligands and its application in the asymmetric synthesis." Thesis, 2014. http://hdl.handle.net/1805/6464.

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Indiana University-Purdue University Indianapolis (IUPUI)<br>The modification of brucine derivatives as chiral ligands and the use of a multifaceted chiral ligand, brucine diol, under different reaction conditions to produce various optical isomers is described. In Chapter 1, the generation of a number of brucine derivatives is described. Taking the advantage of brucine-diol’s excellent molecular recognition capability for multiple organic functional groups, we focused on the synthetic modifications of brucine-diol and the synthesis of brucine N-oxide. We also produced various brucine derivati

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