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Нанотехнологии
Демидовские премии
Гибель династии Романовых
История Урала
Личная библиотека С. В. Вонсовского
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Труды Института высокотемпературной электрохимии УрО РАН
Труды Института истории и археологии УрО РАН
Труды сотрудников Института горного дела УрО РАН
Труды сотрудников Института органического синтеза УрО РАН
Труды сотрудников Института теплофизики УрО РАН
Труды сотрудников Института химии твердого тела УрО РАН
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Труды сотрудников ЦНБ УрО РАН
Публикации Черешнева В.А.
Публикации Чарушина В.Н.
Каталог библиотеки ИГД УрО РАН
Каталог библиотеки ИЭРиЖ УрО РАН
Электронная энциклопедия «Дискурсология»
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 Найдено в других БД:Каталог книг и продолжающихся изданий (19)Труды Института высокотемпературной электрохимии УрО РАН (33)Труды сотрудников Института теплофизики УрО РАН (52)Труды сотрудников Института химии твердого тела УрО РАН (57)Расплавы (22)Публикации Черешнева В.А. (11)Публикации Чарушина В.Н. (17)Каталог библиотеки ИЭРиЖ УрО РАН (3)Библиометрия (1)
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1.

Вид документа : Статья из журнала
Шифр издания : Г/R 32
Автор(ы) : Ivoilova A. V., Tsmokalyuk A. N., Mozharovskaia P., Kozitsina A. N., Ivanova A. V., Rusinov V. L., Mikhalchenko L. V., Leonova M., Lalov A.
Заглавие : Redox conversions of 5-methyl-6-nitro-7-oxo-4,7-dihydro-1,2,4triazolo[1,5-a]pyrimidinide l-arginine monohydrate as a promising antiviral drug
Место публикации : Molecules. - 2021. - Т. 26, № 16. - Ст.5087
ББК : Г
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): nitro-1,2,4-triazolo[1,5a]pyrimidines--triazid--nitro group transformations--nitroaromatic compounds
Аннотация: This article presents the results of a study of electrochemical transformations in aqueous and aprotic media of 5-methyl-6-nitro-7-oxo-4,7-dihydro-1,2,4-triazolo[1,5-a]pyrimidinide l-arginine monohydrate (1a, Triazid) obtained by electrochemical methods and ESR spectroscopy. The effect of pH on the current and the reduction potential of 1a in an aqueous Britton–Robinson buffer solution was studied. It was found that 1a is irreversibly reduced in aqueous acidic media on a glassy carbon electrode in one stage with the participation of six electrons and the formation of 5-methyl-6-amino-7-oxo-1,2,4-triazolo[1,5-a]pyrimidin. The electroreduction of 1a in DMF on a background of tetrabutylammonium salts proceeds in two stages, controlled by the kinetics of second-order reactions. In the first stage, the reduction of 1a is accompanied by protonation by the initial compound of the basic intermediate products formed in the electrode reaction (self-protonation mechanism). The second quasi-reversible stage of the electroreduction 1a corresponds to the formation of a dianion radical upon the reduction of the heterocyclic anion 5-methyl-6-nitro-7-oxo-4,7-dihydro-1,2,4-triazolo[1,5-a]pyrimidin, which is formed upon the potentials of the first peak. The ESR spectrum of the radical dianion was recorded upon electroreduction of Triazid in the presence of Bu4NOH. The effect of the formation of ion pairs on the reversibility of the second peak of the 1a transformation is shown. A change in the rate and regioselectivity of the protonation of the dianion radical in the presence of Na+ and Li+ ions is assumed. The results of studying the electroreduction of 1a by ESR spectroscopy with a TEMPO trap make it possible to assume the simultaneous formation of both a nitroxyl radical and a radical with the spin density localized on the nitrogen at the 4 position of the six-membered ring
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2.

Вид документа : Статья из журнала
Шифр издания : Г/E 27
Автор(ы) : Abu el-Soad A. M., Pestov A. V., Martemyanov N. A., Kovaleva E. G., Lazzara G., Cavallaro G.
Заглавие : Effect of polarity of solvent on silanization of halloysite nanoclay using (3-glycidyloxy propyl) trimethoxy silane
Место публикации : Journal of inorganic and organometallic polymers and materials. - 2021. - № 31. - С. 2569–2578
ББК : Г
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: The grafting of silane groups on clay surfaces has been recently investigated in order to fabricate versatile compounds with new potential applications in materials science and ecological engineering. This work explored the influence of variety of solvents with variable polarity on the silanization of halloysite nanoclay (HNT) surface by (3-Glycidyloxy propyl) trimethoxy silane. To this purpose, the functionalization of HNT by 3-Glycidyloxypropyltrimethoxysilane (GOPTMS) has been conducted in Ethanol (polar protic solvent), Tetrahydrofuran (THF) and Acetonitrile (polar aprotic solvents), and Hexane, 1,4-Dioxane and Toluene (non polar solvents). The silane grafted materials were characterized by using several techniques, including Fourier Transform Infrared Spectroscopy (FT-IR), elemental analysis, Scanning Electron Microscopy (SEM), Thermogravimetry (TGA), X-ray Diffraction Analysis (XRD) and Nitrogen adsorption/desorption isotherms. The largest silane loading has been detected for the hybrid nanomaterials prepared in Hexane as a dispersing medium.
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3.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Rammohan A., Zyryanov G. V.
Заглавие : Minireview: Remdesivir, a prominent nucleotide/nucleoside antiviral drug
Место публикации : Polycyclic aromatic compounds. - 2021. - Vol. 42, № 8. - С. 5824-5831
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): antiviral drug--nucleotide analogue--remdesivir
Аннотация: Nucleotide analogues are the divergent scaffolds that are reliable potential therapeutic drugs to treat the wide range of diseases including viral infections. For instance, Remdesivir is a biologically important nucleotide analogue prodrug that can act as a key drug target for the diseases Ebola and COVID-19. Remdesivir is a structurally chiral aryloxy-phosphoramidate prodrug as it is metabolized into nucleoside triphosphate (active drug form) inside the cell through sequential reactions by ester mediated-hydrolysis. Thus, the current minireview focuses on the earlier reported synthetic approaches of key fragments of remdesivir and their developments to attain the scale-up yields of the drug for clinical/commercial applies. Further, this review serves as a template for the design and development of other complex organic molecules.
https://doi.org/10.1080/10406638.2021.1947331
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4.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Smyshliaeva L. A., Varaksin M. V., Fomina E. I., Medvedeva M. V., Svalova T. S., Kozitsina A. N., Charushin V. N., Chupakhin O. N., Demidov O. P., Borovlev I. V., Mensch C., Mampuys P., Maes B. U. W.
Заглавие : 1,3,7-triazapyrene-based ortho-carborane fluorophores: convenient synthesis, theoretical studies, and aggregation-induced emission properties
Место публикации : Organometallics. - 2021. - Vol. 40, № 16. - С. 2792-2807
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: A convenient transition-metal-free approach, based on nucleophilic substitution of hydrogen (SNH), for consecutive regioselective C–H functionalization of 1,3,7-triazapyrene scaffolds with carboranyllithium and phenyllithium is reported. The theoretical calculations disclosed highlight key features in the regioselectivity and mechanism of the investigated SNH transformations. The novel 1,3,7-triazapyrene-based ortho-carboranes obtained have large potential in the field of molecular electronics as organic luminophores, which are characterized by the aggregation-induced emission and dual-emission effects.
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5.

Вид документа : Статья из журнала
Шифр издания : Г/L 79
Автор(ы) : Tsygankova A. R., Gruzdev D. A., Kanygin V. V., Guselnikova T. Ya., Telegina A. A., Kasatova A. I., Kichigin A. I., Levit G. L., Mechetina L. V., Mukhamadiyarov R. A., Razumov I. A., Solovieva O. I., Volkova O. Yu., Ponomarev A. A., Krasnov V. P., Zavjalov E. L.
Заглавие : Liposomes loaded with lipophilic derivative of closo-carborane as a potential boron delivery system for boron neutron capture therapy of tumors
Место публикации : Mendeleev Communications. - 2021. - Vol. 31, № 5. - С. 659-661
ББК : Г
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): amide--closo-carboranes--liposomes--u87 tumor model--toxicity--biodistribution
Аннотация: Liposomes encapsulated with lipophilic derivative of 1,2-dicarba-closo-dodecaborane have been obtained and tested for toxicity to glioblastoma U87 cells and biodistribution on a U87MG xenograft mouse model. The liposomes are able to penetrate the tumor and provide boron concentration up to 1.5 mmmmg g–1 with tumor-to-muscle ratio up to 2.4.
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6.

Вид документа : Статья из журнала
Шифр издания : Р/R 32
Автор(ы) : Ivoilova A. V., Tsmokalyuk A. N., Kozitsina A. N., Ivanova A. V., Rusinov V. L., Mikhal'chenko L. V.
Заглавие : Redox conversions of new antiviral drug Triazavirin®: electrochemical study and esr spectroscopy
Место публикации : Russian chemical bulletin. - 2021. - Vol. 70, № 6. - С. 1099-1108
ББК : Р
Предметные рубрики: ЗДРАВООХРАНЕНИЕ. МЕДИЦИНСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): triazavirin--antiviral drugs--redox conversions--cyclic voltammetry--esr spectroscopy--chronoamperometry
Аннотация: The results of studying electrochemical conversions of 7-R-3-X-1,2,4-triazolo[5,1-c][1,2,4]-triazin-4-ones (Triazavirin® and its derivatives) using cyclic voltammetry, chronoamperometry, and ESR spectroscopy are presented. The derivatives of 7-R-3-X-1,2,4-triazolo[5,1-c][1,2,4]-triazin-4-ones were found to be capable of electrochemical reducing in the potential range from −0.16 to −0.68 V (vs Ag/AgCl) in a Britton—Robinson buffer at pH 2–12. At the potentials of the first electroreduction step at pH 2–6, the main process of transformations is the four-electron scheme of reduction of the nitro group of Triazavirin®. The adduct of the radical substances with the spin probe N-(1-hydroxy-2,2,6,6-tetramethylpiperidin-4-yl)-2-methylpropanamide was registered after the preliminary generation of the Triazavirin® radical anion at −0.5 V vs Ag/AgCl in an acidic medium. A linear dependence of the current of the first electroreduction step of the Triazavirin® on the concentration was obtained at pH 2 (linearity range from 10−4 to 1.6 · 10−2 mol L−1, I = −1.93 · C, R2 = 0.9977).
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7.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mochulskaya N. N., Nosova E. V., Charushin V. N.
Заглавие : Antiviral agents – benzazine derivatives
Место публикации : Chemistry of heterocyclic compounds. - 2021. - Vol. 57. - С. 374–382
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): benzazines--quinazoline--quinoline--quinoxaline
Аннотация: The review outlines the results of studies of the antiviral activity of quinoline, quinoxaline, and quinazoline derivatives published over the past 5 years. The supplied data indicate the enormous potential of benzazines for the design of effective antiviral drugs.
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8.

Вид документа : Статья из журнала
Шифр издания : Г/B 68
Автор(ы) : Akulov A. A., Varaksin M. V., Tsmokalyuk A. N., Charushin V. N., Chupakhin O. N.
Заглавие : Blue-light-promoted radical c-h azolation of cyclic nitrones enabled by selectfluor®
Место публикации : Green Chemistry. - 2021. - Vol. 23, № 5. - С. 2049-2057
ББК : Г
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: An original approach to achieve the C(sp2)–H azolation of cyclic aldonitrones mediated by Selectfluor® has first been employed. By exploiting a metal-free, visible-light-promoted cross-dehydrogenative C–N coupling reaction between model aldonitrones, 2H-imidazole 1-oxides, and NH-containing azoles, a series of novel azaheterocyclic derivatives have been obtained in yields up to 94%. The elaborated protocol has proved to be appropriate for gram-scale processes and displayed potential for utilization in the synthesis of novel structural analogues of lanabecestat. Besides, mechanistic studies have revealed that this coupling reaction is likely to proceed via a nitroxide-involving radical pathway, encompassing a chain of electron transfer events, such as hydrogen atom transfer (HAT) and single electron transfer (SET).
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9.

Вид документа : Статья из журнала
Шифр издания : Г/S 83
Автор(ы) : Musiyak V. V. , Nizova I. A., Chulakov E. N., Sadretdinova L. S., Tumashov A. A., Levit G. L., Krasnov V. P.
Заглавие : Stereochemical aspects in the synthesis of novel N-(purin-6-yl)dipeptides as potential antimycobacterial agents
Место публикации : Amino Acids. - 2021. - Vol. 53, № 3. - С. 407-415
ББК : Г
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): dipeptides--racemization--purine--coupling--nucleophilic substitution--antimycobacterial activity
Аннотация: The synthesis of purine conjugates with natural amino acids is one of the promising directions in search for novel therapeutic agents, including antimycobacterial agents. The purpose of this study was to synthesize N-(purin-6-yl)dipeptides containing the terminal fragment of (S)-glutamic acid. To obtain the target compounds, two synthetic routes were tested. The first of them is based on coupling of N-(purin-6-yl)-(S)-amino acids to dimethyl (S)-glutamate in the presence of carbodiimide coupling agent followed by the removal of ester groups. However, it turned out that this coupling process was accompanied by racemization of the chiral center of N-(purin-6-yl)-α-amino acids and in all cases led to mixtures of (S,S)- and (R,S)diastereomers (6:4). Individual (S,S)-diastereomers were obtained using an alternative approach based on the nucleophilic substitution of chlorine in 6-chloropurine or 2-amino-6-chloropurine with corresponding dipeptides as nucleophiles. The enantiomeric purity of the target compounds was confirmed by chiral HPLC. To test the assumption that racemization of the chiral center of N-(purin-6-yl)-α-amino acids occurs with the participation of nitrogen atoms of the imidazole ring via the stage of formation of a chirally labile intermediate, we obtained such structural analogs of N-(purin-6-yl)-(S)-alanine as N-(9-benzylpurin-6-yl)-(S)-alanine and N-(7-deazapurin-6-yl)-(S)-alanine. It was found that coupling of these compounds to dimethyl (S)-glutamate was also accompanied by racemization. This indicates that the imidazole fragment does not play a crucial role in this process. When testing the antimycobacterial activity of some of the obtained compounds, conjugates with moderate activity against the laboratory Mycobacterium tuberculosis H37Rv strain (MIC 3.1–6.25 μg/mL) were identified.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kovalev I. S., Sadieva L. K., Taniya O. S., Yurk V. M., Minin A. S., Santra S., Zyryanov G. V., Charushin V. N., Chupakhin O. N., Tsurkan M. V.
Заглавие : Computer vision vs. spectrofluorometer-assisted detection of common nitro-explosive components with bola-type PAH-based chemosensors
Место публикации : RSC Advances. - 2021. - Vol. 11, № 42. - С. 25850-25857
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Computer vision (CV) algorithms are widely utilized in imaging processing for medical and personal electronics applications. In sensorics CV can provide a great potential to quantitate chemosensors' signals. Here we wish to describe a method for the CV-assisted spectrofluorometer-free detection of common nitro-explosive components, e.g. 2,4-dinitrotoluene (DNT) and 2,4,6-trinitrotoluene (TNT), by using polyaromatic hydrocarbon (PAH, PAH = 1-pyrenyl or 9-anthracenyl) – based bola-type chemosensors. The PAH components of these chemical bolas are able to form stable, bright emissive in a visual wavelength region excimers, which allows their use as extended matrices of the RGB colors after imaging and digital processing. In non-polar solvents, the excimers have poor chemosensing properties, while in aqueous solutions, due to the possible micellar formation, these excimers provide “turn-off” fluorescence detection of DNT and TNT in the sub-nanomolar concentrations. A combination of these PAH-based fluorescent chemosensors with the proposed CV-assisted algorithm offers a fast and convenient approach for on-site, real-time, multi-thread analyte detection without the use of fluorometers. Although we focus on the analysis of nitro-explosives, the presented method is a conceptual work describing a general use of CV for quantitative fluorescence detection of various analytes as a simpler alternative to spectrofluorometer-assisted methods.
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