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Dissertations / Theses on the topic 'Chroman derivatives synthesis'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

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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2

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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3

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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4

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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5

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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6

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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7

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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8

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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9

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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10

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

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11

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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12

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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13

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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14

li-hsiang, Cheng, та 鄭禮翔. "Synthesis of chromanol derivatives from α,β-unsaturated ketones and aliphatic aldehydes via Michael addition reaction". Thesis, 2014. http://ndltd.ncl.edu.tw/handle/45954819004561384470.

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碩士<br>國立臺灣師範大學<br>化學系<br>102<br>This thesis describes the synthesis of benzoyl-substituted chromanol derivatives from α,β-unsaturated ketones and aliphatic aldehydes via Michael addition reaction. These derivatives appear as interesting intermediates in the synthesis of various natural products and biologically active compounds. Different types of α,β-unsaturated ketones (57,63) were allowed to react with aliphatic aldehyde to obtain the same products 64aa and 64ab. It’s worth mentioning that starting from either 57 or 63 as starting material, the diastereo orientation of products were differ

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15

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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