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Teses / dissertações sobre o tema "3-oxadiazol"

Autor: Grafiati

Publicado: 4 de junho de 2021

Última modificação: 12 de fevereiro de 2022

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1

Conde, Amanda Solis. "Synthesis of 5-methyl-3-phenyl-1,3,4-oxadiazol-2(3H)-one derivatives by electrophilic aromatic substitution." Wright State University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=wright1547584724393162.

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2

Bhat, Shreesha V. "Synthesis of 1,2,4 oxadiazol-5-imine, 1,2,4-triazol-3-imine and derivatives : a substituted cyanamide-based strategy for heterocycle synthesis." Thesis, University of Lincoln, 2017. http://eprints.lincoln.ac.uk/28632/.

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Considering the importance of nitrogen-rich heterocycles in drug discovery, a novel strategy towards heterocycle synthesis was envisioned using cyanamide chemistry. Synthesis which involve mild conditions, avoids multi-step sequence and non-toxic reagents are desirable for generation of large combinatorial libraries of drug molecules. We envisaged that the NCN linkage of the cyanamide as well as the concomitant use of the nucleo-and electrophilic centres of the cyanamide could provide a novel synthetic route towards nitrogen heterocycles. The first part (Ch-2) constitute the bulk of the thesis

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3

Almeida, Leonardo Viana de. "Síntese e determinação da atividade antimicrobiana de 2-[5-nitro-tiofen-2-il]-3-acetil-5-[4-fenil-substituído]-2,3-diidro-1,3,4-oxadiazol frente à cepa ATCC 25923 de Staphylococcus aureus." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/9/9135/tde-07042010-131506/.

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A introdução de um grupo substituinte na molécula de um fármaco promove alterações químico-estruturais que, por sua vez, modificam suas propriedades físicoquímicas. O arranjo espacial de átomos ou grupos de átomos, em especial grupos funcionais, na molécula de um fármaco, expressos por meio de suas propriedades físico-químicas, influenciam direta ou indiretamente na interação fármaco-receptor. Esta, por sua vez, determina aspectos farmacológicos e farmacocinéticos que influem na eficácia terapêutica do medicamento. Assim, uma série de compostos 2-[5-nitro-tiofen-2-il]-3-acetil-5-[4-fenil-subst

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4

Wolf, Lucas. "Síntese de heterociclos: 2-alquil/arilcalcogeno-n-(4-aril-1,3-tiazol-2-il)acetamidas e (s)-n-(1-(3-aril-1,2,4-oxadiazol-5-il)alquil)-2-(calcogenofenil) acetamidas derivados de organocalcogênios." Universidade Federal de Santa Maria, 2015. http://repositorio.ufsm.br/handle/1/4271.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>In the present work, a series of 2-alkyl/arylchalcogenide-N-(4-aryl-1,3-thiazol-2-yl)acetamide was prepared via addition of aryl or alkyl chalcogenides. This methodology allowed the preparation of new derivatives of 2-amino-1,3-thiazoles in good yields. The compound synthesized is intended to evaluate the biological potential from the antioxidant activity by scavenging capacity of the assay by ABTS and DPPH. Was also developed a methodology for obtaining the compounds (S)-N-(alkyl-1-(3-aryl-1,2,4-oxadiazol-5-yl)-2-(phenylchalcogeni

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5

Pisarenko, Irina [Verfasser], та Joachim Kurt [Akademischer Betreuer] Fandrey. "Interaktionsanalyse der Hypoxie-induzierbaren Transkriptionsfaktoren HIF-2α und ARNT unter Berücksichtigung der Einflussnahme durch den HIF-2α-Liganden N-(3-Chloro-5-fluorophenyl)-4-nitrobenzo[c][1,2,5]oxadiazol-5-amine und verschiedener HIF-2α-Mutationen / Irina Pisarenko ; Betreuer: Joachim Kurt Fandrey". Duisburg, 2018. http://d-nb.info/1159879133/34.

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6

Singh, Neeraj. "Generation of 4,5-Dihydro-1,2,3-oxadiazole and Study of the Decomposition Products." Doctoral thesis, Universitätsbibliothek Chemnitz, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-191706.

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4,5-Dihydro-1,2,3-oxadiazoles are postulated to be key intermediates in the synthesis of ketones from alkenes on an industrial scale, alkylation of DNA in vivo, decomposition of N-nitrosoureas (potent carcinogens), and are also a subject of great interest for theoretical chemists. In this thesis, formation of the parent compound and decay into secondary products has been studied by NMR monitoring analysis. The elusive properties and the intermediacy of the parent compound, 4,5-dihydro-1,2,3-oxadiazole, in the decomposition of suitably substituted N-nitrosoureas using Tl(I) alkoxides as bases,

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7

廖英舜. "Design, Synthesis and Biological Evaluation of 5-(1,2,4-Oxadiazol-3-yl)uridine Derivatives." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/10302593033360195001.

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碩士<br>國立臺灣師範大學<br>化學系<br>98<br>TMPKmt (thymidine monophosphate kinase of Mycobacterium tuberculosis) catalyzes the conversion of thymidine to TMP (thymidine monophosphate). TMP is an important component for DNA replication. According to the affinity between TMPKmt for the TMP analogues, we interpreted that there could be a binding pocket in TMPKmt around the 5-substituent on thymidine. Therefore, 5-substituted uridine derivatives could be potential agents possessing antiviral and anticancer activities. Synthesis of 5-(5-substituted-1,2,4-oxadiazole)uridine was accomplished starting from 5-cyan

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8

林建邦. "Design, Synthesis and Biological Evaluation of 6-Alkylaminouridine and 6-(1,2,4-Oxadiazol-3-yl)uridine Derivatives." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/44401069178815271331.

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碩士<br>國立臺灣師範大學<br>化學系<br>98<br>The focus of this thesis is the synthesis of derivatives for 6-aminouridine and 6-(1,2,4-oxadiazol-3-yl)uridine as a potential inhibitors for orotidine 5’-monophosphate decarboxylase (ODCase). The 6-Cyano-1,3-dimethyluracil was chosen as the reaction model to investigate the substitution reaction with alkylamines as underwent nucleophiles. Our studies have shown that 6-cyano-1,3-dimethyluracil substitution reaction only with primary amines with primary alkyl substitutes. Finally, the reaction was applied for the synthesis of several 6-alkylaminouridine deriv

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9

Li, Ing-Ju, and 李盈儒. "Studies on the Synthesis and Light-Emitting Properties of 9-Substituted-3-(5-aryl-[1,3,4]oxadiazol-2-yl)-9H-carbazole." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/32977857187737798000.

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碩士<br>國立成功大學<br>化學系碩博士班<br>91<br>In this thesis the luminescent organic material was synthesized using carbazole as a starting material and KMnO4 as a cyclization reagent. The structure, physical and electroluminiecent properties for the obtained products including carbazole series and their indole derivatives were studied by the analysis of NMR elemental analysis IR, DSC,TGA,UV-VIS,CV,PL spectrum and EL test. For the thermal stability , all synthesized compounds had good thermal decomposition temperatures ,but low glass transition temperatures. The result for PL spectrum analysis indicat

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10

Wang, Ying Shuo, and 王膺碩. "Synthesis and properties of discotic liquid crystalline crystals based on the disk-like mesogenic groups of 1,3,5-tris(5-phenyl-1,3,4-oxadiazol-2-yl)benzene, dibebzo[2,3-a:2',3'-c]phenazine, and diphenanthro[b:i]-1,4,6,9-tetraazaanthracene." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/06925076558685435859.

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碩士<br>國立臺灣科技大學<br>化學工程系<br>89<br>Three series of discotic liquid crystals with alkyl side chain from 3~12 carbon atoms were prepared and characterized. In the series Ⅰ, three types of discotic liquid crystals with changing the number of flexible long alkyl chains in the surroundings of a 1,3,5-tris(5-phenyl) -1,3,4-oxadiazol-2-yl)benzene core were synthesized: 1,3,5-tris[5-(3,4,5-trialkoxy phenyl)-1,3,5-oxadiazol-2-yl]benzene,TPOB3-n(n=3~12)(R1=R2=R3=OCnH2n+1) (Scheme Ⅰ). 1,3,5-Tris[5-(3,4-dialkoxyphenyl)-1,3,5-oxadiazol-2-yl]benzene, TPOB2-n(n=3~12)(R1=R2=OCnH2n+1 and R3=H)(Sc

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11

Chen, Hui-shan, and 陳慧珊. "Calamitic Mesogens Formed by Heterocyclic Isoxazole, Benzoxazole and 1, 3, 4-Oxadiazole." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/8rc2n9.

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碩士<br>國立中央大學<br>化學學系<br>103<br>In the first series, a new system of isoxazole containing function group of aldehyde, performed reaction of Schiff Base then exhibition mesomorphic properties was synthesize and examined. 2b exhibited SmC phase. The control group 2a with N、SmC phase and 2c exhibited SmC phase. Results indicated that increasing the rigid cores would raise the isotropic temperatures and increasing the OH functional group would supply hydrogen bonds for molecular arrangement regularity. Using variable temperature IR spectroscopy observed the change of interaction. 1b、1c performed re

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12

Lin, Kuan-Ting, and 林冠廷. "Mesogenic Heterocycles Formed by Quinoxalines, Bis–pyrazoles, and Bis–1, 3, 4–Oxadiazoles." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/u7b64v.

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碩士<br>國立中央大學<br>化學學系<br>103<br>This thesis is devided into four different series. In series 1, two new structures of unsymmetric 1, 3, 4–oxa(thia)–diazoles 1a–b and 2 containing both quinoxaline and naphthalene moieties were prepared and their mesomorphic properties were investigated. The mesomorphic behavior of compounds 1–2 was studied by DSC analysis and polarized optical microscopy. All compounds 1a and 2 exhibited hexagonal columnar phases (Colh), which were also confirmed by powder XRD diffractometer. Ncell and Rar values equal to 5.23 and 22.73 Å within a slice of 9.0 Å thick were also

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13

Kuo, Yen-Ling, and 郭燕玲. "Studies on the Synthesis of 4-Aryl-2-substituted-1,3,4- oxadiazolin-5-ones and Their Derivatives from 3-Aryl- 4-chlorosydnones." Thesis, 1993. http://ndltd.ncl.edu.tw/handle/89412243898895973906.

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14

Jung-Feng, Ta''si, and 蔡榮峰. "Synthesis and Properties of Some Thermotropic Liquid Crystalline Hexa(9-Alkyl-carbazole-3-yl)Benzenes, and Bipolar Emitters Containing Quinoxazoline-Based carbazole and 1,3,4-Oxadiazole Derivatives." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/74021257360317232198.

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碩士<br>國立臺灣科技大學<br>化學工程系<br>88<br>The synthetic pathway to a series of new emitter molecules having an oxadiazole group as an electron transport unit and a carbazole group as hole transport unit based on quinoxzline 1QB-C6-C6，2QB-C6-C6 and 1QB-C6-OX，2QB-C6-OX start with the palladium-catalyzed coupling or cross coupling of the 3-Ethynyl-9-hexyl-carbazole 2 with 9-Hexyl-3-iodocarbazole 3 and 2-(4-tert-butylphenyl)-5-(4-iodophenyl)-[1,3,4]oxadi-azole 4 to bis[9-hexyl-carbazole-3-yl]ethyne 5 and 3-{4-[5-(4-tert-butylphenyl)-[1,3,4]oxadiazole-2-yl]-phenylethyn-yl}-9-hexyl-carbazole 6，respectively w

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15

Yang, Shun-Chiech, and 楊順傑. "(I) Reinvestigation of 3-Aryl-1,2,4-oxadiazole Derivatives as Highly Selective Fluorescent Chemodosimeter for Fe3+ (II) Syntheses of 1,3-Alternate Calix[4]arenes with Upper-rim Crown[5] and Lower-rim Methyl Triazoliumpyrene Derivatives for Ion Pair Sensing Studies." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/7wk6m3.

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碩士<br>國立交通大學<br>應用化學系碩博士班<br>101<br>In part 1, we successfully synthesized 1,2,4-oxadiazloe derivatives 24, 30a, 30b and 30c using 1,3-dipolar cycloaddtion reaction of anthryl nitrile oxide with a nitrile group. Compound 24 was found to show a high selectivity toward Fe3+ (among 18 different metal ions) in CH3CN with a strong fluorescence quenching. Compound 24 underwent a Fe3+-induced irreversible oxidation to afford compound X1 as the major product and compounds 25 and 26 as minor products. Compounds X1, 25 and 26 were isolated and characterized by organic spectroscopic data; furthermore, th

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