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Littérature scientifique sur le sujet « Heterocycl »

Auteur : Grafiati
Publié le 10 mars 2023

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Articles de revues sur le sujet "Heterocycl"

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Andres, C. J., Derek J. Denhart, Milind S. Deshpande et Kevin W. Gillman. « Recent Advances in the Solid Phase Synthesis of Drug Heterocyclic Small Molecules ». Combinatorial Chemistry & ; High Throughput Screening 2, no 4 (août 1999) : 191–210. http://dx.doi.org/10.2174/1386207302666220204193145.

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Abstract: Because of their synthetic challenge, broad range of physical I chemical properties, and diverse biological activities, heterocycles continue to be of interest to both the academic and industrial chemist. This review covers recent advances in the solid phase synthesis of drug-like heterocyclic small molecules. Syntheses which form the heterocycle on the solid phase are emphasized; syntheses in which a preformed heterocycle is functionalized on the solid support have been omitted. The majority of references are from publication year 1999. This review should be of interest to anyone involved in, or contemplating the solid phase synthesis of small molecule drug-like heterocycles, especially for combinatorial chemistry applications.
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Winne, Johan, Jan Hullaert, Bram Denoo, Mien Christiaens et Brenda Callebaut. « Heterocycles as Moderators of Allyl Cation Cycloaddition Reactivity ». Synlett 28, no 18 (27 juillet 2017) : 2345–52. http://dx.doi.org/10.1055/s-0036-1588511.

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For the rapid elaboration of polycarbocyclic scaffolds, prevalent in many important families of terpenoid natural products, allyl cations derived from simple heterocyclic alcohols can be used as versatile reaction partners in both (4+3) and (3+2) cycloaddition pathways. Our recent progress in this area is outlined, pointing towards the untapped potential of heterocycles to act as reagents in novel or known but challenging organic transformations.1 Heterocyclic Reagents2 Cycloadditions and Allyl Cations3 Furfuryl Cations in Cycloadditions4 Heterocycle-Substituted Cations in Cycloadditions5 Mechanistic Considerations6 Conclusions and Outlook
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Ma, Huai-Rang, Xiao-Hong Wang et Min-Zhi Deng. « Palladium Catalyzed Cross-Coupling Reaction of Stereodefined Cyclopropylboronic Acids with N-Heterocycl Bromides ». Synthetic Communications 29, no 14 (juillet 1999) : 2477–85. http://dx.doi.org/10.1080/00397919908086254.

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Gzella, Andrzej K., Marcin Kowiel, Aneta Suseł, Magdalena N. Wojtyra et Roman Lesyk. « Heterocyclic tautomerism : reassignment of two crystal structures of 2-amino-1,3-thiazolidin-4-one derivatives ». Acta Crystallographica Section C Structural Chemistry 70, no 8 (31 juillet 2014) : 812–16. http://dx.doi.org/10.1107/s2053229614015162.

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The structures of 5-(2-hydroxyethyl)-2-[(pyridin-2-yl)amino]-1,3-thiazolidin-4-one, C10H11N3O2S, (I), and ethyl 4-[(4-oxo-1,3-thiazolidin-2-yl)amino]benzoate, C12H12N2O3S, (II), which are identical to the entries with refcodes GACXOZ [Váňaet al.(2009).J. Heterocycl. Chem.46, 635–639] and HEGLUC [Behbehani & Ibrahim (2012).Molecules,17, 6362–6385], respectively, in the Cambridge Structural Database [Allen (2002).Acta Cryst.B58, 380–388], have been redetermined at 130 K. This structural study shows that both investigated compounds exist in their crystal structures as the tautomer with the carbonyl–imine group in the five-membered heterocyclic ring and an exocyclic amine N atom, rather than the previously reported tautomer with a secondary amide group and an exocyclic imine N atom. The physicochemical and spectroscopic data of the two investigated compounds are the same as those of GACXOZ and HEGLUC, respectively. In the thiazolidin-4-one system of (I), the S and chiral C atoms, along with the hydroxyethyl group, are disordered. The thiazolidin-4-one fragment takes up two alternative locations in the crystal structure, which allows the molecule to adoptRandSconfigurations. The occupancy factors of the disordered atoms are 0.883 (2) (for theRconfiguration) and 0.117 (2) (for theSconfiguration). In (I), the main factor that determines the crystal packing is a system of hydrogen bonds, involving both strong N—H...N and O—H...O and weak C—H...O hydrogen bonds, linking the molecules into a three-dimensional hydrogen-bond network. On the other hand, in (II), the molecules are linkedviaN—H...O hydrogen bonds into chains.
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Cui, Hai-Lei. « Recent Advances in DMSO-Based Direct Synthesis of Heterocycles ». Molecules 27, no 23 (2 décembre 2022) : 8480. http://dx.doi.org/10.3390/molecules27238480.

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Besides serving as a low-toxicity, inexpensive and easily accessible solvent, dimethyl sulfoxide (DMSO) has also been extensively used as a versatile reagent for the synthesis of functionalized molecules. Dimethyl sulfoxide can not only be utilized as a carbon source, a sulfur source and an oxygen source, but also be employed as a crucial oxidant enabling various transformations. The past decade has witnessed a large number of impressive achievements on the direct synthesis of heterocycles as well as modifications of heterocyclic compounds by applying DMSO as a reagent. This review summarized the DMSO-based direct heterocycle constructions from 2012 to 2022.
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Slivka, Mikhailo, et Mikhailo Onysko. « The Use of Electrophilic Cyclization for the Preparation of Condensed Heterocycles ». Synthesis 53, no 19 (19 mai 2021) : 3497–512. http://dx.doi.org/10.1055/s-0040-1706036.

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AbstractCondensed heterocycles are well-known for their excellent biological effects and they are undeniably important compounds in organic chemistry. Electrophilic cyclization reactions are widely used for the synthesis of mono-heterocyclic compounds. This review highlights the utility of electrophilic cyclization reactions as an effective generic tool for the synthesis of various condensed heterocycles containing functional groups that are able to undergo further chemical transformations, such as nucleophilic substitution, elimination, re-cyclization, cleavage, etc. This review describes the reactions of unsaturated derivatives of different heterocycles with various electrophilic agents (halogens, arylsulfanyl chlorides, mineral acids) resulting in annulation of an additional partially saturated heterocycle. The electrophilic reaction conditions, plausible mechanisms and the use of such transformations in organic synthesis are also discussed. The review mainly focuses on research published since 2002 in order to establish the current state of the art in this area. 1 Introduction2 Electrophilic Cyclization Pathways Involving a Nitrogen Nucleo­philic Center3 Electrophilic Cyclization Pathways Involving a Chalcogen Nucleophilic Center3.1 Sulfur Centers3.2 Oxygen Centers3.3 Selenium Centers4 Strategies and Mechanisms5 Conclusion
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Sparr, Christof, et Christian Fischer. « Configurationally Stable Atropisomeric Acridinium Fluorophores ». Synlett 29, no 16 (3 août 2018) : 2176–80. http://dx.doi.org/10.1055/s-0037-1610233.

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Arylated heterocyclic fluorophores are particularly useful scaffolds for numerous applications, such as bioimaging or synthetic photochemistry. While variation of the substitution pattern at the heterocycle and aryl groups allows dye modulation, the bond rotational barriers are also strongly affected. Unsymmetrically substituted ring systems of rotationally restricted arylated heterocycles therefore lead to configurationally stable atropisomeric fluorophores. Herein, we describe these characteristics by determining the properties and configurational stability of atropisomeric, tri-ortho-substituted naphthyl-acridinium fluorophores. A significant barrier to rotation of >120 kJ mol–1 was measured, which renders these dyes and related compounds distinct ­atropisomers with stereoisomer-specific properties over a broad temperature range.
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Luna, Isadora Silva, Rayssa Marques Duarte da Cruz, Ryldene Marques Duarte da Cruz, Rodrigo Santos Aquino de Araújo et Francisco Jaime Bezerra Mendonça-Junior. « 1,4-Dithiane-2,5-diol : A Versatile Synthon for the Synthesis of Sulfur-containing Heterocycles ». Current Organic Synthesis 15, no 8 (17 décembre 2018) : 1026–42. http://dx.doi.org/10.2174/1570179415666180821154551.

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Background: 1,4-Dithiane-2,5-diol (1,4-DTD) is the stable dimer of α-mercapto acetaldehyde. This commercially available ambidentade compound is characterized as having in its chemical structure one group that acts as an electrophile and another that acts as a nucleophile, this permits its use as versatile and efficient synthon in synthetic heterocycle procedures. Objective: The aim of this review is to present synthetic applications of 1,4-DTD in heterocyclic chemistry and their applicability to the synthesis of bioactive compounds. Conclusion: Gewald reactions to obtain C-4 and C-5 unsubstituted 2-amino-thiophene derivatives; sulfa- Michael/Henry and sulfa-Michael/aldol sequences to obtain polysubstituted tetrahydrothiophenes, and other heterocyclic reactions that allow synthesizing several functionalized sulfur-containing heterocycles such as thiazolidines, oxathiazinoles and thiazoles are presented and discussed. The use of such heterocyclics in subsequent reactions allows obtaining various bioactive compounds including the antiretroviral lamivudine which is one of the examples presented in this review.
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Munzeiwa, Wisdom A., Bernard Omondi et Vincent O. Nyamori. « Architecture and synthesis of P,N-heterocyclic phosphine ligands ». Beilstein Journal of Organic Chemistry 16 (12 mars 2020) : 362–83. http://dx.doi.org/10.3762/bjoc.16.35.

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Diverse P,N-phosphine ligands reported to date have performed exceptionally well as auxiliary ligands in organometallic catalysis. Phosphines bearing 2-pyridyl moieties prominently feature in literature as compared to phosphines with five-membered N-heterocycles. This discussion seeks to paint a broad picture and consolidate different synthetic protocols and techniques for N-heterocyclic phosphine motifs. The introduction provides an account of P,N-phosphine ligands, and their structural and coordination benefits from combining heteroatoms with different basicity in one ligand. The body discusses the synthetic protocols which focus on P–C, P–N-bond formation, substrate and nucleophile types and different N-heterocycle construction strategies. Selected references are given in relation to the applications of the ligands.
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Geisenberger, Josef, Jürgen Erbe, Jürgen Heidrich, Ulrich Nagela et Wolfgang Beck. « Pseudohalogenometallverbindungen, LXV [1] Synthese von Tetrazolen und Triazolen über die 1,3-dipolare Cycloaddition an die Azid-Liganden von polymeren Cobalt(III)-und Palladium(II)-Komplexen. Darstellung und Struktur von 5-TrichlormethyItetrazol / Pseudohalogeno Metal Compounds, LXV [1] Synthesis of Tetrazoles and Triazoles via 1,3-Dipolar Cycloaddition to the Azido Ligands of Polymerie Cobalt(III) and Palladium(II) Complexes. Synthesis and Structure of 5-Trichloromethyltetrazole ». Zeitschrift für Naturforschung B 42, no 1 (1 janvier 1987) : 55–64. http://dx.doi.org/10.1515/znb-1987-0112.

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Abstract The cycloaddition of nitriles and of dimethylacetylenedicarboxylate to the azide ligand of polymeric Schiff Base cobalt(III) and phosphine palladium(II) complexes gives the corresponding tetrazolate and triazolate complexes from which the heterocycles could be cleaved by hydrogen chloride. Usually the yields are low; if the heterocycle is soluble in ether or sublimable, yields up to 30% have been obtained. Using this method the hitherto unknown 5-trichlormethyltetrazole could be prepared which was characterized by an X-ray structural analysis. Similarly, the cyclo-addition of azido(tetraphenylporphinato)cobalt(III) with nitriles, cyclohexylisocyanide and MeO2CC≡CCO2 Me affords the corresponding complexes with heterocyclic ligands. The prepa-ration of tetraphenylporphyrinato(tricyanmethanido)cobalt(III), (TPP)CoN=CC(CN)2 , is reported.
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Thèses sur le sujet "Heterocycl"

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Locke, Julie Myree, University of Western Sydney, College of Health and Science et School of Biomedical and Health Sciences. « Synthetic and conformational studies of hexahydropyrimidines and related heterocycles ». THESIS_CHS_BHS_Locke_J.xml, 2003. http://handle.uws.edu.au:8081/1959.7/638.

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This thesis explores the synthesis and conformational behaviour of hexahydropyrimidines and related heterocycles, with particular emphasis on 5- hyrdohexahydropyrimidines. The conformational behaviour of these compounds was investigated using dynamic NMR spectroscopy, molecular modelling techniques and X-ray crystal structure analysis. The conformational behaviour of 5- hyrdohexahydropyrimidine, hexahydropyrimidine and their analogous oxygen compounds as well as a series of hexahydropyrimidines with various exocyclic substituents, were examined. The preferred conformations of all these compounds are attenuated by a combination of steric and electronic influences. These influences include intramolecular hydrogen bonding as well as anomeric and gauche interactions. The conformational behaviour of the selected seven membered benzodiazepine rings, which share structural characteristics with the six-membered 5- hyrdohexahydropyrimidines was also explored. The increased flexibility of the seven membered rings facilitates intramolecular hydrogen bonding, which in turn retards ring inversion in these systems
Doctor of Philosophy (PhD)
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Wang, Yinli. « Development of A New Heterocycle Forming Reaction and Kinetic Resolution with N-Heterocyclic Carbenes ». Kyoto University, 2018. http://hdl.handle.net/2433/232320.

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Locke, Julie Myree. « Synthetic and conformational studies of hexahydropyrimidines and related heterocycles ». Thesis, View thesis, 2003. http://handle.uws.edu.au:8081/1959.7/638.

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This thesis explores the synthesis and conformational behaviour of hexahydropyrimidines and related heterocycles, with particular emphasis on 5- hyrdohexahydropyrimidines. The conformational behaviour of these compounds was investigated using dynamic NMR spectroscopy, molecular modelling techniques and X-ray crystal structure analysis. The conformational behaviour of 5- hyrdohexahydropyrimidine, hexahydropyrimidine and their analogous oxygen compounds as well as a series of hexahydropyrimidines with various exocyclic substituents, were examined. The preferred conformations of all these compounds are attenuated by a combination of steric and electronic influences. These influences include intramolecular hydrogen bonding as well as anomeric and gauche interactions. The conformational behaviour of the selected seven membered benzodiazepine rings, which share structural characteristics with the six-membered 5- hyrdohexahydropyrimidines was also explored. The increased flexibility of the seven membered rings facilitates intramolecular hydrogen bonding, which in turn retards ring inversion in these systems
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Fletcher, Kristin A. « Mobile Order Theory as Applied to Polycyclic Aromatic Heterocycles ». Thesis, University of North Texas, 1997. https://digital.library.unt.edu/ark:/67531/metadc278994/.

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Experimental mole fraction solubilities of benzil, thianthrene, trans-stilbene, thioxanthen-9-one, diphenyl sulfone and dibenzothiophene sulfone are determined in pure noncomplexing and complexing solvents. Predicted solubility values are calculated for benzil, thianthrene, trans-stilbene and thioxanthen-9-one using expressions derived from Mobile Order theory. Large deviations between experimental and predicted solubilities in alcohol solvents exist, therefore optimized solute - solvent association constants are determined. Previously measured thianthrene solubilities in five binary alkane + cyclohexane solvent mixtures are compared with values predicted from Mobile Order theory using the measured solubility in each of the pure solvents as input parameters. The experimental mole fraction solubility of benzil in eight binary alcohol + 1-octanol solvent mixtures are also measured and compared with predicted values.
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Barnes, Samuel. « Synthesis of 2,4-Disubstituted Pyrimidines of Possible Biological Interest ». Digital Archive @ GSU, 2008. http://digitalarchive.gsu.edu/chemistry_theses/10.

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The synthesis of 2,4-disubstituted pyrimidine derivatives is described. The synthetic route involved the addition reaction of lithiated intermediates, mostly heterocycles, to position 4 of 2-chloropyrimidine to give a dihydropyrimidine intermediate which was oxidized back to a pyrimidine. This was followed by nucleophilic aromatic substitution with various amines of the chlorine in the position 2. A number of compounds were prepared which showed binding towards various serotonin receptors in preliminary biological evaluation.
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Lapinsky, David J. « STUDIES IN AZIRIDINE-ALLYLSILANE CHEMISTRY : EXTENSION OF SCOPE ». Columbus, OH : Ohio State University, 2002. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1038954949.

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Thesis (Ph. D.)--Ohio State University, 2003.
Title from first page of PDF file. Document formatted into pages; contains xx, 256 p.: ill. (some col.). Includes abstract and vita. Advisor: Stephen C. Bergmeier, College of Pharmacy. Includes bibliographical references (p. 234-256).
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Qaddo, Akram. « Enantiospecific nitrogen heterocycle synthesis ». Thesis, University of Sheffield, 2016. http://etheses.whiterose.ac.uk/15791/.

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Morley, Thomas James. « Sulfur mediated heterocycle synthesis ». Thesis, University of Cambridge, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.613825.

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Sadig, Jessie E. R. « Palladium-catalysed heterocycle synthesis ». Thesis, University of Oxford, 2012. http://ora.ox.ac.uk/objects/uuid:c9608957-d215-4a15-87e3-5871c1391946.

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Chapter 1 is a literature review of selected palladium-catalysed aryl C-N and C-S bond forming reactions. The application of these reactions to the synthesis of heterocycles is also discussed. Chapter 2 highlights the importance of the benzimidazole motif and gives a brief discussion of the existing routes to this scaffold. The utility of N-(o-halophenyl)imidoyl chlorides and imidates as precursors to heterocycles is demonstrated in a palladium-catalysed reaction with N-nucleophiles to afford benzimidazole products. Chapter 3 provides a brief introduction to the synthesis of benzothiazoles and describes efforts towards the use of our established substrates for the preparation of these heterocycles. This is achieved via reaction of N-(o-chlorophenyl)imidoyl chlorides with a sulfur nucleophile in a metal-free process. Chapter 4 is a literature review of palladium-catalysed carbonylation chemistry with specific focus on aminocarbonylation and thiocarbonylation reactions of aryl halides. Heterocycle syntheses which employ such carbonylative methods are also discussed. Chapter 5 describes existing protocols for the synthesis of quinazolinones. A novel palladium-catalysed synthesis of these heterocycles from the reaction of our imidate substrates with an amine and carbon monoxide is described. This further demonstrates their utility as general heterocycle precursors
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Sheldrake, Paul J. « Complexed heterocycles ». Thesis, University of Oxford, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.386622.

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Livres sur le sujet "Heterocycl"

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Wang, Yinli. Development of a New Heterocycle-Forming Reaction and Kinetic Resolution with N-Heterocyclic Carbenes. Singapore : Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-9398-3.

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R, Katritzky Alan, Soldatenkov, A. T. (Anatoliĭ Timofeevich) et ebrary Inc, dir. Heterocycles in life and society : An introduction to heterocyclic chemistry, biochemistry and applications. 2e éd. Chichester, West Sussex : Wiley, 2011.

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Pozharskiĭ, A. F. Heterocycles in life and society : An introduction to heterocyclic chemistry and biochemistry and the role of heterocycles in science, technology, medicine, and agriculture. Chichester : Wiley, 1997.

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Abel, E. W., dir. Heterocyclic Chemistry. Cambridge : Royal Society of Chemistry, 2007. http://dx.doi.org/10.1039/9781847551061.

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(Keith), Mills K., et Knovel (Firm), dir. Heterocyclic chemistry. 4e éd. Malden, MA : Blackwell Science, 2000.

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Ameta, Keshav Lalit, Ravi Kant, Andrea Penoni, Angelo Maspero et Luca Scapinello, dir. N-Heterocycles. Singapore : Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-0832-3.

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Iskra, Jernej, dir. Halogenated Heterocycles. Berlin, Heidelberg : Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-25103-0.

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Gakh, Andrei A., et Kenneth L. Kirk, dir. Fluorinated Heterocycles. Washington, DC : American Chemical Society, 2009. http://dx.doi.org/10.1021/bk-2009-1003.

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Suschitzky, H., et O. Meth-Cohn, dir. Heterocyclic Chemistry. Cambridge : Royal Society of Chemistry, 1985. http://dx.doi.org/10.1039/9781847556325.

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Suschitzky, H., dir. Heterocyclic Chemistry. Cambridge : Royal Society of Chemistry, 1986. http://dx.doi.org/10.1039/9781847556332.

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Chapitres de livres sur le sujet "Heterocycl"

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Miyakawa, Shin. « Heterocycle ». Dans Encyclopedia of Astrobiology, 1. Berlin, Heidelberg : Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-27833-4_719-3.

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Miyakawa, Shin. « Heterocycle ». Dans Encyclopedia of Astrobiology, 1106. Berlin, Heidelberg : Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-44185-5_719.

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Miyakawa, Shin. « Heterocycle ». Dans Encyclopedia of Astrobiology, 754–55. Berlin, Heidelberg : Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-11274-4_719.

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Miyakawa, Shin, et Kensei Kobayashi. « Heterocycle ». Dans Encyclopedia of Astrobiology, 1. Berlin, Heidelberg : Springer Berlin Heidelberg, 2022. http://dx.doi.org/10.1007/978-3-642-27833-4_719-4.

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Dolle, Roland E. « Solid-Phase Synthesis of Heterocyclic Systems (Heterocycles Containing One Heteroatom) ». Dans Handbook of Combinatorial Chemistry, 643–84. Weinheim, FRG : Wiley-VCH Verlag GmbH & Co. KGaA, 2004. http://dx.doi.org/10.1002/3527603034.ch22.

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Latscha, Hans Peter, et Uli Kazmaier. « Heterocyclen ». Dans Chemie für Biologen, 593–602. Berlin, Heidelberg : Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-47784-7_38.

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Latscha, Hans Peter, Uli Kazmaier et Helmut Alfons Klein. « Heterocyclen ». Dans Organische Chemie, 331–47. Berlin, Heidelberg : Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-46180-8_22.

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Latscha, Hans Peter, Uli Kazmaier et Helmut Alfons Klein. « Heterocyclen ». Dans Organische Chemie, 313–28. Berlin, Heidelberg : Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/978-3-662-09138-8_22.

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Latscha, Hans Peter, et Helmut Alfons Klein. « Heterocyclen ». Dans Organische Chemie, 315–34. Berlin, Heidelberg : Springer Berlin Heidelberg, 1997. http://dx.doi.org/10.1007/978-3-662-09140-1_27.

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Latscha, Hans Peter, et Helmut Alfons Klein. « Heterocyclen ». Dans Organische Chemie, 337–55. Berlin, Heidelberg : Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-662-09141-8_27.

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Actes de conférences sur le sujet "Heterocycl"

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Haaland, Peter, et James Targove. « Flowing Afterglow Synthesis of Polythiophene Films ». Dans Nonlinear Guided-Wave Phenomena. Washington, D.C. : Optica Publishing Group, 1991. http://dx.doi.org/10.1364/nlgwp.1991.tue4.

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Polymers of aromatic heterocycles such as thiophene and pyrrole have been actively investigated for their promising electrical and optical characteristics. However the use of these materials in waveguide structures has been constrained by morphological and synthetic barriers. Specifically, larger oligomers are less soluble causing multiphase chemical kinetics and irregular morphology in the metal-catalyzed coupling syntheses.fi] Electrochemical preparation methods also produce grainy or fibrillar material, most probably because the heterogeneous boundary conditions on film growth change as insulating or semi-conducting material is deposited on the electrodes. [2] We report here a synthetic approach to the polymeric heterocycle polythiophene using electronically excited argon metastables to activate organic precursors. This method is seen to produce dense, uniform films with desirable thiophene linkages and excellent optical properties.
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Lai, Yi-Hsiang, Yuze Chi, Yuwei Hu, Jie Wang, Cody Hao Yu, Yuan Zhou, Jason Cong et Zhiru Zhang. « HeteroCL ». Dans FPGA '19 : The 2019 ACM/SIGDA International Symposium on Field-Programmable Gate Arrays. New York, NY, USA : ACM, 2019. http://dx.doi.org/10.1145/3289602.3293910.

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Torroba, Tomas, Oleg Rakitin et Charles Rees. « New heterocyclic materials ». Dans The 4th International Electronic Conference on Synthetic Organic Chemistry. Basel, Switzerland : MDPI, 2000. http://dx.doi.org/10.3390/ecsoc-4-01781.

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Manabe, S., H. Yanagisawa, S. Ishikawa, Y. Kitagawa, K. Tohyama, S. Abe et O. Wada. « TRYPTOPHAN PYROLYSIS PRODUCTS FOUND IN COOKED FOODS INHIBIT HUMAN PLATELET AGGREGATION BY INHIBITING CYCLOOXYGENASE ». Dans XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1643402.

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Humans are exposed to numerous toxic compounds in foods. During the past decade, several carcinogenic heterocyclic amines have been reported to be present in the cooked foods. Recently, we reported that some of the carcinogenic heterocyclic amines isolated from foods were present in human plasma. In order to know the effects of the carcinogens isolated from foods on the cell function, we investigated the effects of the carcinogenic heterocyclic amines including Trp-P-1(3-amino-l,4-dimethyl-5H-pyrido❘4,3-b❘indole) and Trp-P-2(3-amino-1-methyl-5H-pyrido❘4,3-b❘indole) on human platelet aggregation and polymorphonuclear leukocyte aggregation. Only tryptophan pyrolysis products, Trp-P-1 and Trp-P-2, had potent inhibitory effects on human platelet aggregation when platelets were preincubated with the carcinogens for 15 min. Other carcinogenic heterocyclic amines such as glutamic acid pyrolysates (Glu-P-1 and Glu-P-2) and 3H-imidazo ❘4,5-f❘quinoline-2-amines(IQ and MelQ) did show no effect on platelet aggregation even at 100 μM.The autoradiogram demonstrated that Tryptophan pyrolysis products, Trp-P-1 and Trp-P-2, dose-dependently inhibited the formation of HHT,PGD2,PGE2 and TXB2 induced by sodium arachidonate in human platelets labeled with ❘ 14c❘ arachidonic acid. Moreover, Trp-P-1 and Trp-P-2 did not show significant effects on leukocyte aggregation induced by sodium arachidonate (0.75mM) even at lOOnM. It is concluded that Trp-P-1 and Trp-P-2 isolated from cooked foodstuffs have potent inhibitory effects on the cyclo-oxygenase pathway of the platelet. Therefore, human platelet function might be affected with daily foods containing tryptophan pyrolysis products in vivo.
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missoum, Hadjer, Yazid Datoussaid et Noureddine Choukchou-braham. « synthesis of heterocycle via Vilsmeier-haack reaction ». Dans The 24th International Electronic Conference on Synthetic Organic Chemistry. Basel, Switzerland : MDPI, 2020. http://dx.doi.org/10.3390/ecsoc-24-08101.

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Stadlbaur, Wolfgang, Gerhard Hojas et Werner Fiala. « Thermal Cyclization of 2-Hydrazonoacyl-3-oxo-heterocycles to Pyrazolo[4,3-c]fused Heterocycles ». Dans The 2nd International Electronic Conference on Synthetic Organic Chemistry. Basel, Switzerland : MDPI, 1998. http://dx.doi.org/10.3390/ecsoc-2-01669.

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Stanovnik, Branko. « 3-Dimethylaminopropenoates and Related Compounds in the Synthesis of Heterocyclic Systems and Heterocyclic Amino Acids ». Dans The 4th International Electronic Conference on Synthetic Organic Chemistry. Basel, Switzerland : MDPI, 2000. http://dx.doi.org/10.3390/ecsoc-4-01783.

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Schnell, Barbara, et Thomas Kappe. « Sulfidation of Heterocyclic 1,3-Dicarbonyl Systems . » Dans The 3rd International Electronic Conference on Synthetic Organic Chemistry. Basel, Switzerland : MDPI, 1999. http://dx.doi.org/10.3390/ecsoc-3-01720.

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Gutierrez, Margarita, Yorley Duarte, Barbara Arevalo, Gonzalo Martinez, Francisca Matus, Tomas Poblete, Jessica Amigo, Gabriel Vallejos et Luis Astudillo. « NITROGEN HETEROCYCLES AS POTENTIAL ANTIBACTERIAL AGENTS ». Dans The 17th International Electronic Conference on Synthetic Organic Chemistry. Basel, Switzerland : MDPI, 2013. http://dx.doi.org/10.3390/ecsoc-17-a035.

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Šíbor, Jiří, et Aleš Bárta. « NEW WAYS OF HETEROCYCLIC CHEMISTRY TEACHING ». Dans 12th International Technology, Education and Development Conference. IATED, 2018. http://dx.doi.org/10.21125/inted.2018.1210.

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Rapports d'organisations sur le sujet "Heterocycl"

1

Boyer, Joseph H. Heterocycles as Laser Dyes. Fort Belvoir, VA : Defense Technical Information Center, juin 1992. http://dx.doi.org/10.21236/ada251574.

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Liu, Shih-Yuan. Hydrogen Storage by Novel CBN Heterocycle Materials. Office of Scientific and Technical Information (OSTI), octobre 2015. http://dx.doi.org/10.2172/1221989.

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Savage, Paul B., John M. Desper et Samuel H. Gellman. Stereoselective Oxidation of an Eleven-Membered Heterocycle. Fort Belvoir, VA : Defense Technical Information Center, janvier 1992. http://dx.doi.org/10.21236/ada252091.

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Habben, C., L. Komorowski, W. Maringgele, A. Meller et K. Niedenzu. Reactions of Some Boron Heterocycles with Pyrazole. Fort Belvoir, VA : Defense Technical Information Center, mars 1989. http://dx.doi.org/10.21236/ada205979.

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Darke, Greg, Tommy Hawkins, Adam Brand, Milton Mckay et Ismail Ismail. Energetic, Low Melting Salts of Simple Heterocycles. Fort Belvoir, VA : Defense Technical Information Center, janvier 2003. http://dx.doi.org/10.21236/ada410888.

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Huang, Qinhua. New Palladium-Catalyzed Approaches to Heterocycles and Carbocycles. Office of Scientific and Technical Information (OSTI), décembre 2004. http://dx.doi.org/10.2172/835382.

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Parshikov, Igor. Microbial Transformation of Some Ethylpyridines by Fungi. Intellectual Archive, janvier 2022. http://dx.doi.org/10.32370/iaj.2635.

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We were observed transformation 4-ethylpyridine and 2-methyl-5-ethylpyridine by fungus Beauveria bassiana ATCC 7159. Stereoselective oxidation of methylene group leading to the optically active (-)-(1-hydroxyethyl)pyridine was shown. Besides, the hydroxylation of methyl groups and the oxidation of the heterocyclic ring in the nitrogen atom to the respective primary alcohols and N-oxides were observed
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Allcock, Harry R. Strained Inorganic Heterocyclic Compounds and their Conversion to Macrocycles and High Polymers. Fort Belvoir, VA : Defense Technical Information Center, octobre 1991. http://dx.doi.org/10.21236/ada241414.

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Pagoria, P., et A. Racoveanu. Trinitromethyl Heterocyclic Oxidizers as a Solid Propellant Ingredient Final Report CRADA No TC02146.0. Office of Scientific and Technical Information (OSTI), août 2017. http://dx.doi.org/10.2172/1417952.

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Beasley, Jonathan. Synthesis of heterocycles : Indolo (2,1-a) isoquinolines, renewables, and aptamer ligands for cellular imaging. Office of Scientific and Technical Information (OSTI), janvier 2013. http://dx.doi.org/10.2172/1082980.

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