Готові списки джерел за темами / Diaryl Diselenides

Добірка наукової літератури з теми "Diaryl Diselenides"

Автор: Grafiati
Опубліковано: 6 вересня 2023

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Статті в журналах з теми "Diaryl Diselenides"

1

Kobiki, Yohsuke, Shin-ichi Kawaguchi, Takashi Ohe, and Akiya Ogawa. "Photoinduced synthesis of unsymmetrical diaryl selenides from triarylbismuthines and diaryl diselenides." Beilstein Journal of Organic Chemistry 9 (June 13, 2013): 1141–47. http://dx.doi.org/10.3762/bjoc.9.127.

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A novel method of photoinduced synthesis of unsymmetrical diaryl selenides from triarylbismuthines and diaryl diselenides has been developed. Although the arylation reactions with triarylbismuthines are usually catalyzed by transition-metal complexes, the present arylation of diaryl diselenides with triarylbismuthines proceeds upon photoirradiation in the absence of transition-metal catalysts. A variety of unsymmetrical diaryl selenides can be conveniently prepared by using this arylation method.
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2

Perin, Gelson, Daniela Rodrigues Araujo, Patrick Carvalho Nobre, Eder João Lenardao, Raquel Guimarães Jacob, Marcio Santos Silva, and Juliano Alex Roehrs. "Ultrasound-promoted synthesis of 2-organoselanyl-naphthalenes using Oxone® in aqueous medium as an oxidizing agent." PeerJ 6 (May 7, 2018): e4706. http://dx.doi.org/10.7717/peerj.4706.

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A green methodology to synthesize 2-organoselanyl-naphthalenes based on the reaction of alkynols with diaryl diselenides is described. The electrophilic species of selenium were generated in situ, by the oxidative cleavage of the Se–Se bond of diaryl diselenides by Oxone® using water as the solvent. The reactions proceeded efficiently under ultrasonic irradiation as an alternative energy source, using a range of alkynols and diorganyl diselenides as starting materials. Through this methodology, the corresponding 2-organoselanyl-naphthalenes were obtained in moderate to good yields (56–94%) and in short reaction times (0.25–2.3 h).
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3

Movassagh, Barahman, and Azadeh Fazelia. "Zinc-Mediated Synthesis of Diaryl Selenides from Diaryl Diselenides and Diaryliodonium Salts in Aqueous Media." Zeitschrift für Naturforschung B 61, no. 2 (February 1, 2006): 194–96. http://dx.doi.org/10.1515/znb-2006-0213.

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AbstractAn efficient synthetic method has been developed for the preparation of symmetrical and unsymmetrical diaryl selenides through a one-pot reaction of diaryl diselenides and diaryliodonium salts in the presence of Zn/AlCl3 system in aqueous media.
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4

Zhao, Hong, Yuanyuan Jiang, Qiurong Chen, and Mingzhong Cai. "A highly efficient and reusable MCM-41-immobilized bipyridine copper(i) catalyst for the C–Se coupling of organoboronic acids with diaryl diselenides." New Journal of Chemistry 39, no. 3 (2015): 2106–15. http://dx.doi.org/10.1039/c4nj01687d.

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5

Luchese, Cristiane, Ricardo Brandão, Carmine I. Acker, and Cristina W. Nogueira. "2,2′-Dipyridyl diselenide is a better antioxidant than other disubstituted diaryl diselenides." Molecular and Cellular Biochemistry 367, no. 1-2 (April 29, 2012): 153–63. http://dx.doi.org/10.1007/s11010-012-1328-5.

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6

Zhou, Long-Hu, and Yong-Min Zhang. "Low-valent Titanium Induced Reductive Coupling of Diaryl Diselenides with Acid Chlorides or Acid Anhydrides: Facile Synthesis of Selenoesters." Journal of Chemical Research 23, no. 1 (January 1999): 28–29. http://dx.doi.org/10.1177/174751989902300120.

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7

Balaguez, Renata A., Vanessa G. Ricordi, Rodrigo C. Duarte, Josene M. Toldo, Cristtofer M. Santos, Paulo H. Schneider, Paulo F. B. Gonçalves, Fabiano S. Rodembusch, and Diego Alves. "Bis-arylsulfenyl- and bis-arylselanyl-benzo-2,1,3-thiadiazoles: synthesis and photophysical characterization." RSC Advances 6, no. 55 (2016): 49613–24. http://dx.doi.org/10.1039/c6ra04157d.

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Bis-arylsulfenyl- and bis-arylselanyl-benzo-2,1,3-thiadiazoles were synthesized in good yields by copper-catalysed cross-coupling reaction of arylthiols or diaryl diselenides with the commercially available 4,7-dibromobenzo[c][1,2,5]thiadiazole.
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8

Kumar, R. Uday, Kommula Dileep, K. Harsha Vardhan Reddy, and Y. V. D. Nageswar. "Cu(OAc)2-Promoted Thiolation and Selenylation of C(sp2)-H Bonds Using a 2-Amino Oxazole Directing Group." Letters in Organic Chemistry 16, no. 2 (January 9, 2019): 110–16. http://dx.doi.org/10.2174/1570178615666180627111437.

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Cu-catalyzed thiolation or selenylation of aryl C-H bonds with diaryl disulfides and diphenyl diselenides was accomplished using a readily removable directing group. This protocol represents a convenient route for the formation of valuable diaryl sulfides or diphenyl selenides. This simple method gives a variety of functionalized diphenyl sulfides or diphenyl selenides in moderate to good yields in a simple and efficient way.
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9

Butov, G. M., V. M. Mokhov, Yu P. Tsapkova, R. L. Antipin, A. Yu Gavrilova, and N. V. Zyk. "Reaction of [3.3.1]propellanes with diaryl diselenides." Russian Journal of Organic Chemistry 46, no. 6 (June 2010): 929–30. http://dx.doi.org/10.1134/s1070428010060266.

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10

Oilunkaniemi, Raija, Risto S. Laitinen, and Markku Ahlgrén. "The Solid State Conformation of Diaryl Ditellurides and Diselenides: The Crystal and Molecular Structures of (C4H3E2)2E'2 (E = O, S; E' = Te, Se)." Zeitschrift für Naturforschung B 55, no. 5 (May 1, 2000): 361–68. http://dx.doi.org/10.1515/znb-2000-0503.

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The crystal and molecular structures of dithienyl ditelluride (C4H3S)2Te2 (1), difuryl ditelluride (C4H3O)2Te2 (2), dithienyl diselenide (C4H3S)2Se2 (3), and difuryl diselenide (C4H3O)2Se2 (4) are reported in this paper and compared to those of other simple diaryl ditellurides and diselenides. The chalcogen-chajcogen bonds exhibit approximately single bond lengths [Te-Te = 2.7337(8) and 2.7240(4) Å in 1 and 2, respectively; Se-Se = 2.357(1) and 2.368(2) Å in 3 and 4, respectively], as do the chalcogen-carbon bond lengths [Te-C = 2.095(9) - 2.104(6) in 1 and 2.091(6) - 2.105(9) Å in 2; Se-C = 1.87(1) - 1.90(1) Å in 3 and 1.887(8) - 1.897(10) Å in 4]. The aromatic rings are disordered. The dihedral angles C-E-E-C range from 79(2) to 96(1)° are consistent with the concept of minimized p lone-pair repulsion of adjacent chalcogen atoms. The dependence of molecular parameters on the angle between the aromatic rings and the chalcogen-chalcogen bonds follow trends established previously for aromatic disulfides. Though the bond parameters and conformations of 1 - 4 are similar, the packing of the molecules is different. The two ditellurides 1 and 2 show short Te···Te contacts (3.900 - 4.002 Å in 1 and 4.060 - 4.172 Å in 2). The two diselenides 3 and 4 do not exhibit close chalcogen-chalcogen interactions. The NMR spectroscopic properties of 1 - 4 are discussed.
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Більше джерел

Дисертації з теми "Diaryl Diselenides"

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Nedel, Fernanda. "Seleção de novas moléculas e modalidades de tratamento no combate ao câncer." Universidade Federal de Pelotas, 2012. http://repositorio.ufpel.edu.br/handle/ri/1209.

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Made available in DSpace on 2014-08-20T13:32:46Z (GMT). No. of bitstreams: 1 tese_fernanda_nedel.pdf: 5232153 bytes, checksum: 94c9f4584571a1e142e44a8b165fc8dd (MD5) Previous issue date: 2012-09-17
Cancer is a leading cause of death and its rates are expected to increase 50% by 2020. Although surgical resection and additional therapies (such as chemotherapy and radiotherapy) are able to cure well-confined, primary tumors, the same does not apply during metastasis due to the systemic involvement and its resistance to conventional therapies. Therefore, the current clinical challenge is to develop new drugs and treatment modalities that will significantly impact the cure rates. In this sense, the present study aimed to evaluate the anticancer effect and study the underlying cell death mechanisms of diaryl diselenides and its substituted structures - (4-ClC6H4Se)2, (3-CF3C6H4Se)2 e (4-MeOC6H4Se)2 - on the human colon adenocarcinoma cell line (HT-29). We verified that (3-CF3C6H4Se)2 and (4-MeOC6H4Se)2 induced cytotoxicity through apoptosis mechanisms in HT-29 cells, where pro-apoptotic genes were up-regulated (Bax, caspase-9, caspase-8, apoptosis-inducing factor (AIF) and endonuclease G (EndoG), and anti-apoptotic genes were down-regulated (Bcl-2 and survivin). In a second moment we evaluated the anticancer potential of Canavalia brasiliensis (ConBr), Canavalia boliviana (ConBol) and Canavalia ensiformis (ConA) lectins in HT-29 cells, which showed an effective capacity to reduce cell viability. Once the anticancer effect was confirmed, lectins were labeled with FITC and its interaction with the tumor cells was investigated. The FITC-ConA and FITC-ConBol demonstrated the potential to bind to HT-29 cells unlike FITC-ConBr. In order to investigate a new treatment modality, the interaction between the respective lectins with HT-29 was evaluated when associated with functionalized multi-walled carbon nanotubes (f-MWCNTs). When f-MWNT was incorporated to FITC-ConBol and FITC-ConA lectins there was an increase in fluorescence intensity.
O câncer é uma das principais causas de morte no mundo, onde os índices devem aumentar 50% até 2020. Embora a ressecção cirúrgica e terapias adicionais (como a quimioterapias e radioterapias) sejam capazes de curar tumores primários bem delimitados, o mesmo não se aplica a metástase devido ao seu envolvimento sistêmico e a resistência a terapias convencionais. Portanto, atualmente o desfio clínico é desenvolver novas drogas e modalidades de tratamentos que irão impactar significativamente as taxas de cura do câncer. Neste sentido, o presente trabalho objetivou avaliar o efeito antineoplásico e investigar a rota de apoptose induzido pelo disseleneto de diarila e seus derivados substituídos - (4-ClC6H4Se)2, (3-CF3C6H4Se)2 e (4-MeOC6H4Se)2 - em células de adenocarcinoma de colorretal humano (HT-29). Verificamos que os compostos (3-CF3C6H4Se)2 e (4-MeOC6H4Se)2 induziram um efeito citotoxidade por meio de apoptose, onde os genes pró-apoptoticos (Bax, caspase-9, caspase-8, fator indutor de apoptose (AIF) e endonuclease G (EndoG)) foram altamente expressos e os genes anti-apoptótico (Bcl-2 e survivin) mostraram uma redução na sua expressão. Em um segundo momento avaliamos o potencial antineoplásico das lectinas Canavalia brasiliensis (ConBr), Canavalia boliviana (ConBol) e Canavalia ensiformis (ConA) em células HT-29, as quais se mostraram efetivas em reduzir a viabilidade celular. Uma vez confirmado o efeito antineoplásico, as lectinas forma marcadas com FITC e a sua interação com as células tumorais foi investigado. As lectinas FITC-ConA e FITC-ConBol demonstraram potencial de se ligar as células HT-29 ao contrário da FITC-ConBr. A fim de investigar uma nova modalidade de tratamento foi avaliada a interação entre as respectivas lectinas com as células HT-29 quando associadas à nanotubos de carbonos funcionalizados de paredes múltiplas (f-MWCNTs). Quando os f-MWCNTs foram incorporados as lectinas FITC-ConA e FITC-ConBol houve um aumentaram na intensidade de fluorescência.
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2

Bhowmick, Debasish. "Structure-Activity Correlation and Mechanistic Investigations of Glutathione Peroxidase-Like Catalytic Activity of Diaryl Diselenides." Thesis, 2014. https://etd.iisc.ac.in/handle/2005/4563.

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Hydroperoxides are very harmful and they can oxidize several biomolecules, causing different disease states. Glutathione peroxidase (GPx) is a mammalian selenoenzyme which protects human body from oxidative damage by catalyzing the reduction of harmful peroxides using glutathione (GSH) as a cofactor. GPx contains selenocysteine in its active site. The catalytic cycle of GPx enzymes is believed to involve three steps. In the first step, the reduced selenolate moiety (E-SeH) of Sec residue reduces hydroperoxides to water (or alcohol) to form oxidized selenenic acid (E-SeOH), which upon reaction with one equivalent of GSH generates selenenyl sulfide (E-SeSG) intermediate. A second equivalent of cellular GSH attacks at the –Se-S-bond to regenerate the active selenol species with elimination of the oxidized GSH (GSSG) and thus completes the catalytic cycle (Scheme 1). Therefore, the formation of the selenol species from the selenenyl sulfide intermediate is a crucial step for the catalytic activity. Cleavage of the -Se-S-bond is the rate determining step in the overall process. The GSH concentration in the cellular level is maintained by an enzyme glutathione reductase
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Частини книг з теми "Diaryl Diselenides"

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Sato, R., and T. Kimura. "Symmetrical Dialkyl Diselenides." In Sulfur, Selenium, and Tellurium, 1. Georg Thieme Verlag KG, 2008. http://dx.doi.org/10.1055/sos-sd-039-01332.

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2

Sato, R., and T. Kimura. "Cyclic Dialkyl Diselenides." In Sulfur, Selenium, and Tellurium, 1. Georg Thieme Verlag KG, 2008. http://dx.doi.org/10.1055/sos-sd-039-01443.

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3

Collier, S. J. "Synthesis of Diacyl Diselenides and Diacyl Ditellurides." In Three Carbon-Heteroatom Bonds: Acid Halides; Carboxylic Acids and Acid Salts, 1. Georg Thieme Verlag KG, 2007. http://dx.doi.org/10.1055/sos-sd-020-01546.

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4

Comasseto, J. V., and A. S. Guarezemini. "Reduction of Dialkyl Diselenides." In Sulfur, Selenium, and Tellurium, 1. Georg Thieme Verlag KG, 2008. http://dx.doi.org/10.1055/sos-sd-039-01250.

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5

Rossi, L. "Reaction with Dialkyl Diselenides." In Four Carbon-Heteroatom Bonds, 1. Georg Thieme Verlag KG, 2005. http://dx.doi.org/10.1055/sos-sd-018-00783.

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6

Braverman, S., M. Cherkinsky, and S. Levinger. "Oxidative Cleavage of Dialkyl Diselenides." In Sulfur, Selenium, and Tellurium, 1. Georg Thieme Verlag KG, 2008. http://dx.doi.org/10.1055/sos-sd-039-01173.

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7

Wirth, T. "Reaction of Dialkyl Diselenides with Tetraorganodiphosphines." In Sulfur, Selenium, and Tellurium, 1. Georg Thieme Verlag KG, 2008. http://dx.doi.org/10.1055/sos-sd-039-01324.

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8

Comasseto, J. V., and A. S. Guarezemini. "Reduction of Dialkyl Diselenides and Alkyl Selenocyanates." In Sulfur, Selenium, and Tellurium, 1. Georg Thieme Verlag KG, 2008. http://dx.doi.org/10.1055/sos-sd-039-01212.

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9

Tang, Y., and X. L. Sun. "Reaction of Dialkyl Diselenides with Alkyl Halides." In Sulfur, Selenium, and Tellurium, 1. Georg Thieme Verlag KG, 2008. http://dx.doi.org/10.1055/sos-sd-039-01308.

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10

Comasseto, J. V., and A. S. Guarezemini. "Reaction of Dialkyl Diselenides with Indium(I) Iodide." In Sulfur, Selenium, and Tellurium, 1. Georg Thieme Verlag KG, 2008. http://dx.doi.org/10.1055/sos-sd-039-01240.

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Тези доповідей конференцій з теми "Diaryl Diselenides"

1

Braga, Antonio Luiz, Syed M. Salman, Sayyar Muhamamd, Oscar E. D. Rodrigues, Luciano Dornelles, and Ricardo S. Schwab. "Copper Oxide Nanoparticles-Catalyzed Aziridine Ring Opening with Diaryl Diselenides Under Ionic Liquid as Reaction Medium." In 14th Brazilian Meeting on Organic Synthesis. São Paulo: Editora Edgard Blücher, 2013. http://dx.doi.org/10.5151/chempro-14bmos-r0026-1.

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