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Dissertations / Theses on the topic 'Chromone derivatives'

Author: Grafiati

Published: 5 June 2025

Last updated: 1 August 2025

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1

Sabbagh, Liezel Veronica. "Chemical studies of chromone derivatives." Thesis, Rhodes University, 2001. http://hdl.handle.net/10962/d1006899.

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This study has focussed on several aspects of chromone chemistry, viz., (i) the influence of remote substituents on the basicity of 2-(N,N-dimethylamino)chromones, (ii) MoritaBaylis-Hillman reactions of substituted chromone-3-carbaldehydes and (iii) an investigation into the application of chromone chemistry in the total synthesis of the marine natural product, Rietone A. Selected 2-(N,N-dimethylamino )chromones were prepared using two different methods; firstly, via cyclisation of salicylate-derived N,N-dimethyl-3;.(2-hydroxyphenyl)-3- oxopropanamide precursors and, secondly, via 2-hydroxyace

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2

Nchinda, Aloysius Tchangwe. "Chemical studies of selected chromone derivatives." Thesis, Rhodes University, 2002. http://hdl.handle.net/10962/d1007442.

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This investigation has been geared towards several aspects of chromone chemistry. Selected 2-(N,N-dimethylarnino)chromones have been synthesized via 2-hydroxyacetophenone boron difluoride complex intermediates, and potentiometric analysis of these compounds in ethanolwater has been used to determine the influence of substituents on their basicity. The pKa values have been found to lie within a narrow range (1.92 - 2.52), and the observed substituent effects have been rationalized with the aid of semi-empirical and ab initio molecular orbital calculations. An efficient route has been developed

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3

Davidson, Deborah Nicole. "Chemical and spectroscopic studies of chromone derivatives." Thesis, Rhodes University, 1992. http://hdl.handle.net/10962/d1006857.

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Various chromone derivatives have been used in asthma therapy, and their biological activity is apparently related to certain chemical features which include conformation and acidity. In the present study, substituent effects on conformation and acidity have been explored in chromone systems with potential biological activity. A range of variously substituted symmetrical chromone-2-carboxamides (including a series of N,N-dimethylchromone-2-carboxamides) have been prepared via chromone-2-carboxylic acids, which, in turn, were prepared from the corresponding o-hydroxyacetophenones. The N,N-dimet

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4

Ramaite, Ipfani David Isaiah. "Chemical and spectroscopic studies of chromone derivatives." Thesis, Rhodes University, 1993. http://hdl.handle.net/10962/d1006888.

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A number of biologically active chromones occur in plants (eg. Khellin) and research in this field has eventually led to the discovery of chromoglycic acid, which is widely used as a sodium salt in asthma therapy. Since biological activity may be related to acidity, a range of chromone-2-carboxylic acids have been prepared via Claisen acylation of substituted o- hydroxyacetophenones and their acid dissociation constants determined potentiometrically to explore substituent effects. From this study it has been found that introduction of certain groups does have a marked effect on acidity. A vari

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5

Ramaite, Ipfani David Isaiah. "Synthetic and physical organic studies of chromone derivatives." Thesis, Rhodes University, 1997. http://hdl.handle.net/10962/d1005045.

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A range of chromone-2-carboxylic acids has been prepared by condensing suitably substituted 2-hydroxyacetophenones with diethyl oxalate. pK₂ Studies of these acids revealed that 6- or 7-methoxy substituents decreased acidity while the 6-nitro group enhanced acidity; the strongest acid was the 3-chloro derivative, the increase in acidity being attributed to steric inhibition of acid-weakening delocalisation between the carboxyl group and the chromone system. Various chromone-2-carboxamides, derived from acid chloride precursors, were converted to polysubstituted acrylamides by nucleophilic ring

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6

Molefe, Duduzile Mabel. "Studies directed towards the synthesis of chromone carbaldehyde-derived HIV-1 protease inhibitors." Thesis, Rhodes University, 2008. http://hdl.handle.net/10962/d1015542.

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A series of chromone-3-carbaldehydes have been prepared using Vilsmeier-Haack methodology while a corresponding series of chromone-2-carbaldeydes have been synthesized via the Kostanecki-Robinson reaction. Baylis-Hillman reactions have been conducted on both series of chromone carbaldehydes using three different catalysts, viz., 1,4-diazabicyclo(2.2.2]octane (DABCO), 1,8-diazabicyclo[5.4.0]undec- 7-ene (DBU) and 3-hydroxyquinuclidine (3HQ), and acrylonitrile, methyl acrylate and methyl vinyl ketone as the activated alkenes. These reactions have typically (but not always!) afforded both normal

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7

Mujahid, M. "Asymmetric syntheses of pharmaceutically important compounds employing hydrolytic kinetic resolution strategy and development of novel chromone based derivatives as potent antitubercular agents." Thesis(Ph.D.), CSIR-National Chemical Laboratory, Pune, 2013. http://dspace.ncl.res.in:8080/xmlui/handle/20.500.12252/2196.

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8

Obah, kosso Anne. "Arylsélénation et sélénocyanation d'hétérocycles riches en électrons." Electronic Thesis or Diss., Aix-Marseille, 2019. http://www.theses.fr/2019AIXM0643.

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Ce travail s’inscrit dans la recherche et le développement de nouvelles méthodologies pour la synthèse de molécules portant un groupement sélénocyané ou arylsélanyle. Dans une première partie, le trisélénodicyanure (TSD) généré à partir du malononitrile et du dioxyde de sélénium a été utilisé pour la substitution électrophile d’hétérocycles riches en électrons tels que les imidazohétérocycles, les chromèn-4-ones et également pour l’ipso-sélénocyanation d’acides arylboroniques sans l’utilisation de métaux. Cette sélénocyanation permet d’accéder rapidement et de façon fiable aux dimères diséléni

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9

Shervington, L. A. "Studies on a new synthesis of chromans." Thesis, Bucks New University, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.380298.

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10

Nocanda, Xolani Wittleton. "Applications of Baylis-Idllman methodology in the synthesis of chromene derivatives." Thesis, Rhodes University, 2001. http://hdl.handle.net/10962/d1018257.

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The reaction of salicylaldehyde with various activated alkenes, viz., methyl vinyl ketone, ethyl vinyl ketone, phenyl vinyl sulfone, phenyl vinylsulfonate, acrolein and acrylonitrile, under Baylis-Hillman conditions, has been found to proceed with the chemoselective formation of chromene derivatives. The reaction conditions have been optimised and chromene derivatives have been obtained in isolated yields up to 87 %. The generality of the reaction, using 1,4-diazabicyclo[2.2.2]octane (DABCO), as the catalyst, and a heterogeneous (chloroform-water) solvent system, has been established using a r

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11

Toullec, Anne. "Synthesis of chromones and flavones derivatives for pharmaceutical and cosmetical applications." Université Louis Pasteur (Strasbourg) (1971-2008), 2006. http://www.theses.fr/2006STR13238.

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Les flavonoïdes sont des composés polyphénoliques naturels largement distribués dans de nombreuses plantes. La plupart d’entre eux possèdent des activités biologiques (piégeurs de radicaux, anti-inflammatoires…), très recherchées dans l’industrie pharmaceutique et cosmétique. Les chromones sont des composés structurellement proches des flavones, beaucoup moins diversifiés dans la nature et dont les activités biologiques ont été moins étudiées que celles des flavones. Nous nous sommes intéressés, dans une première partie, aux activités cosmétiques et plus particulièrement dermatologiques de cer

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12

Cusack, Michael. "Development of a Focused Library of C2 and C5 Modified 4-Chromanone Derivatives as Potential Antimicrobials." Thesis, Southern Illinois University at Edwardsville, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10808318.

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13

Lu, Zijun. "Theoretical and Numerical Analysis of Phase Changes in Soft Condensed Matter." Case Western Reserve University School of Graduate Studies / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=case15620007885239.

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14

Machado, Nelson Filipe Lopes. "Chromone derivatives as antioxidant agents : the structural variable." Doctoral thesis, 2012. http://hdl.handle.net/10316/23600.

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Tese de doutoramento em Bioquímica (Biofísica Molecular) apresentada à Faculdade de Ciências e Tecnologia da Universidade de Coimbra<br>Since oxidative stress is known to be the basis for numerous severe pathologies, from cardiovascular and neurodegenerative disorders to cancer, the development of effective antioxidant agents from natural origin has been the object of vigorous research in the last decade, in view of establishing novel chemopreventive strategies against these diseases, which are nowadays the main cause of death worldwide. Chromone derivatives, namely flavones and isoflavon

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15

Ramonetha, Thata Golden. "Synthetic and spectroscopic studies of 6-substituted chromone derivatives." Diss., 2015. http://hdl.handle.net/11602/772.

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16

Mpitimpiti, Annah Nyasha. "Synthesis and evaluation of chromone derivatives as inhibitors of monoamine oxidase / Annah Nyasha Mpitimpiti." Thesis, 2014. http://hdl.handle.net/10394/15449.

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BACKGROUND AND RATIONALE Parkinson’s disease (PD) is a chronic, progressive neurodegenerative disorder affecting the central nervous system, primarily, the substantia nigra. It is characterized by loss of dopaminergic neurons in the nigro-striatal pathway, and ultimately patients with Parkinson’s disease may lose up to 80% of their dopamine-producing cells in the brain. Symptoms include bradykinesia, muscle rigidity, resting tremor and impaired postural balance. Symptomatic relief is obtained by using levodopa and various adjunct therapy including dopamine agonists, catechol-O-methyltransferas

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17

PROIETTI, MONACO LUCA. "Novel 4h-chromen-4-one, 2h-chromene and chroman derivatives: design, synthesis and biological evaluation." Doctoral thesis, 2013. http://hdl.handle.net/11573/918173.

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La progettazione e sintesi di nuovi antivirali strutturalmente correlati a flavanoidi e flavonoidi sia naturali che sintetici e lo studio della relativa attività anti-picornavirus dei 4H-cromen-4-oni e 2H-cromeni ha portato ad identificare l’(E)-3-stiril-2H-cromene come un inibitore potente, selettivo e ad ampio spettro d’azione nei confronti dei rhinovirus umani (HRV). l’(E)-3-stiril-2H-cromene è stato perciò selezionato come hit compound sul quale effettuare uno studio sistematico di ottimizzazione della struttura. Sono stati quindi progettati e sintetizzati un ampio numero di arilalchil cro

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18

Gomes, João Guilherme Louçano Domingues. "Reactivity studies on chromene derivatives." Master's thesis, 2015. http://hdl.handle.net/1822/41135.

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Dissertação de mestrado em Medicinal Chemistry<br>Chromenes are privileged scaffolds as they comprise multiple natural and synthetic derivatives having pharmacological activity, both in vitro and in vivo. Substituted 1-(2-oxo-2H-chromen-3-yl)pyridinium chloride salts were recently prepared from the reaction of an appropriate salicylaldehyde and 1-(cyanomethyl)pyridinium chloride, in two steps. This work presents a study of the reactivity of these salts, to be used as precursors of novel chromene derivatives. In a previous work, 1-(2-oxo-2H-chromen-3-yl)pyridinium chloride salts were fou

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19

Gonçalves, Ana Alexandra Gomes. "Synthesis of chromene derivatives with potential anticancer activity." Master's thesis, 2013. http://hdl.handle.net/1822/28328.

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Dissertação de mestrado em Química Medicinal<br>Colorectal carcinoma (CRC) is the second leading cause of cancer-related death in industrialized countries and the search for new therapeutic approaches is of prime importance. Chromene-based compounds are present in many natural products and their interest in organic chemistry is mainly due to the multiple biological properties. In this work, several chromene derivatives were synthesized using simple and environmentally benign approaches, and were tested in vitro against human cancer cell lines HCT116, HT29 and RKO. The first part of this

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20

Li, Da-Fang, and 李達方. "A new method for the synthesis of chromene derivatives." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/68874984114167477458.

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碩士<br>高雄醫學大學<br>醫藥暨應用化學研究所碩士在職專班<br>96<br>A new route to the synthesis of chromene derivatives from resorcinol is studied.The synthetic rout involues Wittg reaction, alkylation, ring-closing metathesis (RCM) and Claisen rearrangement. The final products have the similar skeleton to osthol structure. In the new synthetic approach, the chromene derivatives prepare from the resorcinol that was reacted with acetyl chloride, benzyl bromide, allyl bromide and methoxyacetophenone. Then, the diene compounds were reacted with Grubb’2nd catalyst via ring-closing metathesis (RCM).

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21

Conceição, Fábio Daniel Pedroso Lima. "Novel chromene and imidazole derivatives: synthesis, biological evaluation and computational studies." Doctoral thesis, 2022. http://hdl.handle.net/1822/76987.

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Tese de doutoramento em Chemistry (especialização em Organic and Biological Chemistry)<br>A investigação de compostos bioactivos que possam levar ao desenvolvimento de novas alternativas terapêuticas para algumas das patologias mais nefastas a nível mundial continua, nos dias de hoje, a ser uma necessidade no ramo da Química Medicinal. Nesta pesquisa, algumas moléculas presentes na natureza são usadas como ponto de partida para o desenvolvimento de novos compostos promissores. Neste âmbito, os cromenos e os imidazóis são amplamente reconhecidos como estruturas interessantes. Estão descrit

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22

Huang, Chia-Yu, and 黃傢裕. "Synthesis of Indole, Indoline, Benzofuran and Chroman Derivatives from Nitroalkenes." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/79382536634409889369.

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碩士<br>國立臺灣師範大學<br>化學系<br>103<br>The contents of the thesis is divided into two chapters, each chapter individually including preface, research goal, result and discussion, and conclusion. Chapter I deals with the copper-catalyzed Ullmann reaction to synthesize 3-arylindoles, in which the precursors are furnished by AlCl3-catalyzed Friedel-Crafts alkylation of beta-nitrostyrenes and arenes followed by reduction. Chapter II discuss about the applicability of beta-nitrostyrene derivatives for the synthesis of structurally three types of compounds. The chapter is divided into three parts, first pa

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23

Lai, Yu-Ting, and 賴羽庭. "Organocatalytic Synthesis of Chromanone Derivatives via Michael/Acetalization/Hemiacetalization Reaction Sequence." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/q4qgrv.

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24

Huang, Chin-Neng, and 黃志能. "Part I、Design and synthesis of 3-(2-Phenyl-4H-thio-chromen-4-yildene)-3H-chromene-2,4-dione derivatives as potential redox switchesPart II、Design and Synthesis of 7-N,N-dimethylamino-4-hydroxycoumarin-based derivatives as potential organic photochromi." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/33645529616308159980.

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碩士<br>東海大學<br>化學系<br>95<br>Part I、Design and synthesis of 2'-phenyl-[3,4']bichromenylidene -2,4-dione derivatives as potential redox switching Tow 3-(2-Phenyl-4H-thiochromen-4-yildene)-3H-chromene-2,4-dione derivatives were synthesized in several steps from thiophenol and 4-hydroxycoumarins with overall yields of 65 and 67%. The prepared compounds 16 and 21 instantly changed from either purple or bule to colorless when treated them with sodium borohydride in methanol. The resulting reduced compounds reverted to their original colors after the reducing agent was removed. While no fluorescence

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25

Wang, Tzu-Ping, and 王子平. "Enantioselective Synthesis of Chromeno[3,4-d]pyrrole Derivatives by Using Cinchona Alkaloid Derived Bifunctional Organocatalyst." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/66524534633269731415.

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碩士<br>國立臺灣師範大學<br>化學系<br>104<br>In the first chapter, a novel cascade reaction was developed for the synthesis of chromeno[3,4-d]pyrrole in high yields and with excellent enantioselectivities. Under mild conditions, the cascade reactions efficiently established six stereogenic centers including five quaternary stereocenter in the expected products. In the second chapter, a novel, base-catalyzed and highly diastereoselective direct Michael addition-isomerization sequence is presented for the efficient synthesis of Rauhut-Currier-type adducts. It was quite unexpected to see the α-addition of γ-

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26

Liao, Wei-Ting, and 廖唯廷. "Synthesis of Flavanone Derivatives via Conjugate Addition of Chromones and Arylboronic Acids by Reusable Palladium Catalyst in Water." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/xh89a3.

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碩士<br>國立臺北科技大學<br>有機高分子研究所<br>105<br>Flavonoids and flavanones are privileged structural motifs in numerous nature products and pharmaceutical molecules that show a variety of biological activities. For example: anti-oxidation, anti-inflammatory, anti-bacterial, anti-cancer and so on. In this study, we developed a Pd(OAc)2/cationic 2,2’-bipyridyl-catalytic system to catalyzed conjugate addition of chromones and arylboronic acids forming flavanone derivatives using water as the reaction medium. In comparison with other published conditions, our reaction not only use water as the green solvent f

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27

Lin, Yung-Feng, та 林永峰. "The Preparation of (E)-Styrenes and Chromanone Derivatives from β-Nitrostyrenes and Aldehyde in thepresence of Peroxide". Thesis, 2004. http://ndltd.ncl.edu.tw/handle/99146158854440437101.

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碩士<br>國立臺灣師範大學<br>化學研究所<br>92<br>Various geometrically pure (E)--alkyl-styrenes have been synthesized by the radical substitution of the NO2 group by the alkyl moieties which were generated via hydrogen abstraction followed by decarbonylation within aliphatic aldehydes. These reactions occurred with high chemical- and regio-selectivity and gave a new access to (E)--alkyl-styrenes. Not only aliphatic but aromatic aldehydes can also be used in this novel reaction. When 2-allyloxy-benzaldehyde 9 was used to perform this reaction, the benzoyl radical added to the double bond directly without dec

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28

Kuo, Ting-Yi, and 郭廷逸. "Excited state intramolecular proton transfer in 3-hydroxy-2-(thiophen-2-yl) chromen-4-one and derivatives." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/88675120226062121813.

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碩士<br>國立臺灣大學<br>化學研究所<br>101<br>3-HTC-DiCN and 3-HTCA, the derivatives of 3-Hydroxy-2-(thiophen-2-yl) chromen-4-one(3-HTC) , they are the first two examples to observe the rate of ESIPT (Excited-State Intramolecular Proton Transfer ) are excitation wavelength dependent. At steady state emission spectra, we can see the ratio of normal form and tautomer form’s emission depends on excitation wavelength. By time-correlated single photon counting method, we observed the normal form and tautomer form are not equilibrium at excited state. So we use femtosecond fluorescence up-conversion to observe th

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29

Kan, Yueh-Ping, and 甘月萍. "PART-1 Synthetic Studies of New Chromenes Derivatives PART-2 Synthetic Studies of N-Alkanoic Acid Cyanine Dyes." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/61764216963748405963.

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碩士<br>朝陽科技大學<br>應用化學系碩士班<br>96<br>part1. The major applications for the photochromic functional colorants are in the field of optical memory. In material the past few decades, new materials utilized a combination of polymers and photochromic dyes for the high technology appcations , such as photochromic sunglasses, color filter photochromic fiber, ultraviolet indicator , or 3-D optical recording material and so on. It pum UV light irracliation , spiropyran dyes change into the corresponding ring-open form resulten in a singl absorption peak in the visishe sange. If the applications need th

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30

Tsai, Cheng-Che, та 蔡政哲. "Investigation of phosphine-mediated or catalyzed reactions : synthesis of furo[3,2-c]chromen-4-one derivatives or β-acylated 2-arylidene-1,3-indandiones". Thesis, 2014. http://ndltd.ncl.edu.tw/handle/72881699469199977003.

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31

YANG, YA-AN, and 楊雅安. "Part I、Synthesis of Coumarin-fused Pyrido[2,1-a]isoquinolin-8-ium Heterocycles and Their DerivativesPart II、Multicomponent Synthesis of (3E)-3-[Alkylamino(aryl)methylidene]chroman-2,4-diones and -Nitro Amide Derivatives." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/z6e558.

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碩士<br>東海大學<br>化學系<br>106<br>Part I、Synthesis of Coumarin-fused Pyrido[2,1-a]isoquinolin -8-ium Heterocycles and Their Derivatives Protoberberines are alkaloids that exhibit a wide range of biological activities such as antimicrobial, anti-inflammatory, antimalarial, and antitumor. Previous synthetic efforts have been primarily focused on the biological and therapeutic applications of protoberberines, their intrinsic photochemical properties were much less explored. In this study, a coumarin and pyrido[2,1-a]isoquinolin-8-ium-fused heterocycles were synthesized by p-TsOH-mediated coupling

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32

Chang, Ho-Chiang, and 張豪晉. "1. Synthesis of Substituted 1-Benzoxepin-2-one from Isovanillin via Ring-Closing Metathesis (RCM)2. A New Approach for the Synthesis of Mellein Derivatives from Isovanillin via 3,4-Dihydro-2-chroman Intermediate." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/88918019211283716041.

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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>Part I Isovanillin was used as starting material which underwent sequential reactions such as O-alkylation, and ring-closing metathesis (RCM) to provide substituted 1-benzoxepin-2-one derivatives. Part II Utilization of O-alkylation, Claisen rearrangement, reduction, oxymercuration-demercuration and oxidation in sequences, a series of mellein derivatives were synthesized via 3,4-dihydro-2-chroman intermediate from isovanillin.

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