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Dissertations / Theses on the topic 'Regioselective reduction'

Author: Grafiati
Published: 23 November 2024
Last updated: 31 July 2025

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1

Hassan, Hassan Abbas. "Partial synthesis and regioselective reduction of steroidal 11,12-seco-dioic anhydrides." Thesis, University of Glasgow, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.281225.

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2

Fox, Stephen Carter. "Regioselective Synthesis of Novel Cellulose Derivatives for Drug Delivery." Diss., Virginia Tech, 2011. http://hdl.handle.net/10919/77263.

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New methods were developed for the regioselective synthesis of new classes of cellulose derivatives with properties that could help improve the delivery of pharmaceutical drugs within the human body. The specific synthetic targets of this research were regioselectively carboxylated and regioselectively aminated cellulose derivatives. While different avenues to the carboxylated cellulose were ultimately explored without success, a new method for the synthesis of selectively <i>O</i>-acylated 6-amino-6-deoxy-cellulose esters was devised. A key reaction that enabled the synthesis of the new cell
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3

Arnaout, Abdulkarim al. "Synthese regioselective de dihydropyridines et de pyridines 2- ou 4-fonctionnalisees : applications." Poitiers, 1987. http://www.theses.fr/1987POIT2254.

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4

Rodrigo, Sanjeewa K. "Nickel Catalyzed Regioselective Reductive Coupling Reactions." University of Cincinnati / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1396532622.

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5

Ma, Zhiwei. "Progress Towards the Total Synthesis of Yaku'amide A." BYU ScholarsArchive, 2015. https://scholarsarchive.byu.edu/etd/6002.

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The synthetic progress towards yaku'amide A is described. The study leads to development of new synthetic methodologies. Base-free regioselective aminohydroxylation is convenient to deliver β-tert-hydroxyamino acids. A sequence consisting of alkylative esterification, Martin sulfurane mediated anti dehydration, a tandem azide reduction-O→N acyl transfer allows the rapid access of E- and Z-dehydroisoleucine-containing peptides from β-tert-hydroxyisoleucine derivatives. Those methods are effective in constructing complicated peptides and advanced subunits of yaku'amide A.
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6

BOUTOUTE, PATRICK. "Reductions electrochimique et electroenzymatique regioselectives ou enantiogenique de systemes insaturees." Clermont-Ferrand 2, 1995. http://www.theses.fr/1995CLF21710.

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Ce travail presente les differents resultats obtenus dans l'etude de la reduction purement electrochimique ou electroenzymatique de molecules presentant une ou plusieurs insaturations. Ainsi, differentes 2-aroyl et 2-acetylchromones ont ete etudiees en vue de leur reduction regioselective. Il a ete montre que dans le cas des 2-aroylchromones, la fonction carbonyle du substituant en position 2 du cycle chromone a ete reduite regioselectivement tandis que pour la 2-acetylchromone, c'est la double liaison du cycle qui est reduite. Les produits obtenus conduisent apres une nouvelle electroreductio
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7

Palucci, Benedetta. "Rhodium and Palladium Catalysed Unusual Regioselective Hydroformylation and Rhodium Catalysed Reductive Carbonylation." Doctoral thesis, Universitat Rovira i Virgili, 2020. http://hdl.handle.net/10803/670491.

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La present tesi doctoral té com a objectiu el desenvolupament de sistemes per aconseguir una regioselectivitat no convencional en l’hidroformilació d'alquens terminals. Degut a que nombroses substàncies naturals perfumades contenen un grup aldehid. Els processos d’hidroformilació, on es fan reaccionar monòxid de carboni i hidrogen amb olefines, han esdevenit mètodes inestimables per a les empreses de fragàncies per a la producció d’aquests derivats. La regioselectividad del procés, per a l’obtenció del producte lineal o ramificat, és extremadament dependent del substrat. Com a tendència genera
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8

Gommenginger, Clément. "Des ynamides pour la synthèse de molécules azotées fluorées inédites." Electronic Thesis or Diss., Strasbourg, 2024. http://www.theses.fr/2024STRAF024.

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Ces travaux décrivent l’utilisation d’ynamides et de N-allènamides comme intermédiaires clés pour la synthèse d’hétérocycles azotés et fluorés inédits. Une réaction de cyclisation intramoléculaire de mésyl N-allènamides trifluorométhylés promue par le TBAF a permis la synthèse de y-sultames trifluorométhylés alors que, l’utilisation d’un mélange TBAF/acide acétique, a permis l’obtention de y-sultames gem-difluorés. La formation de diènes trifluorométhylés substitués par une fonction amide, obtenue par une réaction de métathèse d’ène-ynamides avec un aldéhyde, a permis la synthèse de plateforme
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9

Sayah, Ghassemi Babak. "Chimie et réactivité des hexahydropyrroloindolizines : application à la synthèse des myrmicarines." Université Joseph Fourier (Grenoble), 2001. http://www.theses.fr/2001GRE10114.

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Parmi les composes naturels ou synthetiques possedant des activites biologiques interessantes, les alcaloides tiennent une part importante. Recemment une nouvelle famille d'alcaloides bicycliques et oligocycliques, nommee myrmicarine, a ete isolee de glandes a poisons de fourmis d'afrique de type mirmicinae. La plupart de ces composes possedent en totalite ou en partie un motif hexahydropyrroloindolizine contenant un centre stereogene dont la configuration absolue n'est pas connue. Nous avons entrepris la synthese de ces alcaloides sous forme enantiopure. Dans un premier temps, suivant une str
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10

Lemétais, Aurélie. "Catalyse tandem pour la protection régiosélective de saccharides : vers l’élaboration de sulfoglycolipides mycobactériens." Thesis, Paris 11, 2011. http://www.theses.fr/2011PA112273.

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L’accès par voie chimique à des oligosaccharides nécessite souvent le recours à de nombreuses étapes de protection-déprotection. Au cours de ce projet de thèse, une méthodologie pour la protection régiosélective et orthogonale des fonctions alcool de disaccharides dérivant de la biomasse a tout d’abord été développée. Les glycopyranosides protégés ont été préparés par catalyse tandem au FeCl3∙6H2O en réalisant dans le même pot des réactions d’acétalation, d’éthérification réductrice, d’acétylation et/ou d’ouverture réductrice régiosélective d’acétals. Dans un second temps, une stratégie de syn
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11

Sinibaldi, Marie-Eve. "Nouveaux intermediaires pour la synthese d'alcaloides pentacycliques : synthese totale de la desethyl-20 acetyl-20 aspidospermidine." Clermont-Ferrand 2, 1988. http://www.theses.fr/1988CLF21144.

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12

Lin, Yushiang, and 林鈺翔. "Apply the method of regioselective palladium-catalyzed formate reduction to synthesize Zoapatanol precursor." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/10623256175004130840.

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碩士<br>國立中央大學<br>化學研究所<br>97<br>The method for regioselective palladium-catalyzed formate reduction of allylic acetates formed by ring closing metathesis was developed. We used ((E)-2,5,6,7-tetrahydro-7-methyl-7-phenyloxepin-3-yl)methyl acetate 4 as the model compound, and found an optimized condition for the formate reduction by screening several ligand. In order to apply this methodology to organic synthesis , We planned to synthesize compound C5 , that was the key synthetic intermediate in Cossy’s synthesis to product Zoapatanol . Zoapatanol contains a seven membered oxygen-heterocycle with
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13

Hsu, Ru-Ting, and 許如婷. "Regioselective Reduction of N-Alkyl-3-sulfonyl Glutarimides. Synthesis of 3,4-Dihydro-5-tosylpyridin-2-ones." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/40964817054601118332.

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碩士<br>國立中山大學<br>化學系研究所<br>89<br>In this report, we described a general method which could regioselectively reduce the carbonyl group on 3-sulfonyl glutarimides and lead to the corresponding hydroxy piperidones (hydroxy lactams) and further converted to 3,4-dihydro-5-tosylpyridin-2-ones .
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14

Cheng, Hsiu-yi, and 鄭秀宜. "Asymmetric Synthesis of (-)-Isooncinotine and Formal Syntheses of Zoapatanols by Ring-Closing Metathesis/Regioselective Formate Reduction." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/03792205138498614198.

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博士<br>國立中央大學<br>化學研究所<br>99<br>There are two topics in the thesis. The first is formal syntheses of zoapatanols by ring-closing metathesis/regioselective formate reduction. The combination of ring-closing metathesis and regioselective formate reduction is an effective strategy for the synthesis of cyclic compounds with exo olefins. Reduction of allylic acetates, formed by ring-closing metathesis, using allylpalladium chloride dimer, di-tert-butyl 2-biphenyl-phosphine, and formic acid/ triethylamine in DMF gives the exo-cyclic olefins with excellent regioselectivity and high yields under a mild
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15

Chang, Bo-Rui, and 張伯睿. "Regioselective Reduction of N-Alkyl-3-sulfonyl Glutarimides and the Applications in Pharmaceuticals and Natural Product Synthesis." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/12800237501678012684.

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博士<br>國立中山大學<br>化學系研究所<br>91<br>A formal [3+3] cycloaddition strategy to substituted glutarimides was studied. N-Alkyl-sulfonylacetamides and various a,b-unsaturated esters were used as starting materials. Regioselective reduction of N-alkyl-3-sulfonyl glutarimides and the applications in pharmaceuticals and natural product synthesis
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16

Yu, Jhen-Kuei, and 余鎮奎. "Catalysts controlled regioselective (3+2) cycloaddition between azomethine ylide and indandionebenzylidines to prepare highly enantioselective chromanopyrrolidinesSynthesis of functionalized furans via chemoselective reduction/Wittig reaction using catalytic trimethylamine and phosphine." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/f49y32.

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碩士<br>國立臺灣師範大學<br>化學系<br>105<br>I. Catalyst-controlled regioselective (3+2) cycloaddition of azomethine ylide and indandionebenzylidines for synthesis of highly enantioselective chromanopyrrolidines. II. Synthesis of functionalized furans via chemoselective reduction/Wittig reaction using catalytic triethylamine and phosphine Part I. A novel and highly enantioselective (3+2) cycloaddition/esterification cascade for the synthesis of chromano[3,4-b]pyrrolidine derivatives is reported. Quinine-derived base, hydroquinine squaramide, affects this cascade reaction efficiently providing the product
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17

Tzeng, Zheng-Hao, and 曾政豪. "Cu(OTf)2-catalyzed Regioselective Reductive Ring Opening of Benzylidene Acetals." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/93942810154091716178.

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碩士<br>國立清華大學<br>化學系<br>91<br>A systematic study of various metal trifluoromethanesulfonates as efficient catalysts including the effects of solvents, reducing reagents, and temperature in the regioselective silane-reductive ring opening of 4,6-O-benzylidene acetals at O4 is described. The corresponding secondary alcohols were obtained in excellent yields under an optimized combination of 1 mol% Cu(OTf)2 and 2 equiv Me2EtSiH in CH3CN.
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18

Wu, Yao-Peng, and 巫耀朋. "Aryl imidazolium ionic liquid−catalyzed Friedel−Crafts acylation, thioesterification, acetylation, and regioselective reductive ring opening of benzylidene acetals." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/7sw7sz.

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碩士<br>國立中興大學<br>化學系所<br>107<br>Aryl imidazolium ionic liquids successfully catalyzed Friedel−Crafts acylation, thioesterification, per-O-acetylation, and regioselective reductive ring opening of benzylidene acetals in the sealed tubes. These reactions can form a C−C bond, a C−S bond, a C−O bond, and C−H bond with high atom economy. Two ionic liquids exhibited high activity and catalyzed essential reactions with good to excellent yields.
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19

(5930111), Sudipta Pal. "Nickel Catalyzed Cycloaddition Reactions: Alkyne Cyclotrimerizations and Reductive Vinylidene Transfer Reactions." Thesis, 2021.

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The advent of transition metal catalysis has greatly expanded the scope of viable cycloaddition reactions, allowing for the direct synthesis of highly functionalized and complex biologically active compounds. By manipulating various aspects of catalyst structure, including the supporting ligands and the central metal, the function of a catalyst can be modified. In this context, the catalytic properties of dinuclear complexes have not been greatly explored in cycloaddition reactions. Our research has focused on studying the catalytic properties of dinuclear complexes in cycloaddition reactions.
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