Relevant bibliographies by topics / Azacycle

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Academic literature on the topic 'Azacycle'

Author: Grafiati
Published: 4 June 2021
Last updated: 10 February 2022

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Journal articles on the topic "Azacycle"

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Lee, Eun, Tae Seop Kang, Beom Jun Joo, Jin Sung Tae, Kap Sok Li, and Cheol Keun Chung. "Azacycle synthesis via radical cyclization of β-aminoacrylates." Tetrahedron Letters 36, no. 3 (January 1995): 417–20. http://dx.doi.org/10.1016/0040-4039(94)02223-x.

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Kudryavtsev, Konstantin V., Polina M. Ivantcova, and Andrei V. Churakov. "(1SR,3RS,3aSR,6aRS)-Methyl 5-methyl-4,6-dioxo-3-[2-(trifluoromethyl)phenyl]octahydropyrrolo[3,4-c]pyrrole-1-carboxylate." Acta Crystallographica Section E Structure Reports Online 69, no. 2 (January 4, 2013): o161—o162. http://dx.doi.org/10.1107/s1600536812051471.

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In the title compound, C16H15F3N2O4, the relative stereochemistry of the four stereogenic C atoms has been determined. The carboxymethyl and 2-(trifluoromethyl)phenyl substituents of the pyrrolidine cycle have acismutual arrangement. The five-membered saturated azacycle adopts an envelope conformation with the N atom occupying the flap position. In the crystal, adjacent molecules are combined in centrosymmetric dimers by two weak N—H...O hydrogen bonds.
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Biswas, Tanmoy, Titas Biswas, and Shital K. Chattopadhyay. "Synthesis of chiral oxa- and azacycle-fused anthraquinone derivatives." Tetrahedron: Asymmetry 21, no. 2 (February 2010): 232–36. http://dx.doi.org/10.1016/j.tetasy.2010.02.001.

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Jara, Paul, Nicolás Yutronic, and Guillermo González. "13C CP-MAS NMR of Azacycle-Thiourea Inclusion Compounds." Supramolecular Chemistry 9, no. 3 (August 1, 1998): 163–68. http://dx.doi.org/10.1080/10610279808034982.

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LEE, E., T. S. KANG, B. J. JOO, J. S. TAE, K. S. LI, and C. K. CHUNG. "ChemInform Abstract: Azacycle Synthesis via Radical Cyclization of β-Aminoacrylates." ChemInform 26, no. 21 (August 18, 2010): no. http://dx.doi.org/10.1002/chin.199521062.

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Morokuma, Kenji, Shuntaro Tsukamoto, Kyosuke Mori, Kei Miyako, Ryuichi Sakai, Raku Irie, and Masato Oikawa. "Menthyl esterification allows chiral resolution for the synthesis of artificial glutamate analogs." Beilstein Journal of Organic Chemistry 17 (February 24, 2021): 540–50. http://dx.doi.org/10.3762/bjoc.17.48.

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Herein, we report the enantiospecific synthesis of two artificial glutamate analogs designed based on IKM-159, an antagonist selective to the AMPA-type ionotropic glutamate receptor. The synthesis features the chiral resolution of the carboxylic acid intermediate by the esterification with ʟ-menthol, followed by a configurational analysis by NMR, conformational calculation, and X-ray crystallography. A mice in vivo assay showed that (2R)-MC-27, with a six-membered oxacycle, is neuroactive, whereas the (2S)-counterpart is inactive. It was also found that TKM-38, with an eight-membered azacycle, is neuronally inactive, showing that the activity is controlled by the ring C.
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Kotha, Sambasivarao, and Ongolu Ravikumar. "Synthesis of fused azacycle via Overman rearrangement and ring-rearrangement metathesis as key steps." Tetrahedron Letters 57, no. 18 (May 2016): 1994–96. http://dx.doi.org/10.1016/j.tetlet.2016.03.087.

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Wang, Yinli, Raphaël Oriez, Satoru Kuwano, Yousuke Yamaoka, Kiyosei Takasu, and Ken-ichi Yamada. "Oxa- and Azacycle Formation via Migrative Cyclization of Sulfonylalkynol and Sulfonylalkynamide with N-Heterocyclic Carbene." Journal of Organic Chemistry 81, no. 6 (March 10, 2016): 2652–64. http://dx.doi.org/10.1021/acs.joc.6b00182.

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Ciufolini, Marco A., Cynthia W. Hermann, Kenton H. Whitmire, and Norman E. Byrne. "Chemoenzymatic preparation of trans-2,6-dialkylpiperidines and of other azacycle building blocks. Total synthesis of (+)-desoxoprosopinine." Journal of the American Chemical Society 111, no. 9 (April 1989): 3473–75. http://dx.doi.org/10.1021/ja00191a078.

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Li, Shouming, and Shosuke Yamamura. "Synthesis of the tetracyclic ABCE ring subunit I, bearing the 13-membered azacycle, of manzamine A." Tetrahedron 54, no. 30 (July 1998): 8691–710. http://dx.doi.org/10.1016/s0040-4020(98)00479-7.

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Dissertations / Theses on the topic "Azacycle"

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Williamson, David. "Azacycle synthesis via cyclofunctionalisation of aminoalkenes." Thesis, University of Oxford, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.515023.

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Klaumünzer, Bastian. "Stickstoffinversion in Azacyclen : Modellsimulationen für einen molekularen Schalter." Master's thesis, Universität Potsdam, 2008. http://opus.kobv.de/ubp/volltexte/2008/1748/.

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In dieser Arbeit wird durch Modellrechnungen gezeigt, wie die Stickstoffinversion in Azacyclen als molekularer Schalter genutzt werden könnte. Hierzu werden ein Fluorazetidin- und ein Fluorazacyclopentanderviat quantenchemisch untersucht. Das letztere Molekül wird auch quantendynamisch untersucht. Jedes der beiden Moleküle besitzt zwei stabile Konformationen. Es wird gezeigt, dass das Azabicyclopentanderivat von der einen Konformation mittels zweier linear polarisierter IR-Laserpulse durch sogenanntes “ladder climbing” in die andere überführt werden kann.
In this work it is shown by model simulation, how the nitrogon inversion in azacycles could be used as a molecular switch. For this a azetidine derivative and a fluoroazabicyclopentane derivative have been investigated quantumchemically. Both of the molecules have two stable conformers. The latter molecule is also investigated quantumdynamically. Its is shown that the azabicyclopentanederivative can be switched from one conformer to the other by using two linear polarised IR laser pulses via ladder climbing.
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Rodriguez, y. Fischer Nicolas. "Ringumlagerungsmetathesen zu Azacyclen." [S.l.] : [s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=970742436.

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Mortimer, Claire. "New transformations of azacycles." Thesis, University of Oxford, 2015. https://ora.ox.ac.uk/objects/uuid:1fe27dc8-6525-4d45-a398-b3e6531e7b99.

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The work presented in this thesis involves new transformations of azacycles, focusing on the introduction of functionality α-to N. α-C-H functionalisation on an azetidine has been a long-standing challenge, with N-protecting/activating groups that work well in the higher and lower azacyclic systems not viable. A recent breakthrough in the Hodgson group showed the rarely used N-thiopivaloyl group was effective for α-deprotonation– electrophile trapping on azetidines, but was not without limitations concerning harsh removal conditions and scope for further substitutions. This thesis describes efforts to overcome these issues by development of a new protecting/activating group for N, t-butoxythiocarbonyl (Botc).
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Roberts, Paul. "The asymmetric sythesis of azacycles." Thesis, University of Oxford, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.422721.

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Miaskiewicz, Solène. "Or et azacycles : vers la synthèse totale de molécules naturelles." Thesis, Strasbourg, 2017. http://www.theses.fr/2017STRAF006/document.

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La Nature est une source quasi inépuisable de molécules possédant des propriétés biologiques souvent remarquables. Ainsi, les plantes fournissent chaque jour de nouvelles structures dont les chimistes s’inspirent afin de créer de façon synthétique des molécules similaires ou dérivées pouvant avoir de potentielles applications en tant qu’agents thérapeutiques par exemple.L’émergence de la catalyse organométallique a permis d’améliorer considérablement les méthodes de synthèse de molécules complexes. La catalyse homogène à l’or, dont le potentiel n’a été exploité qu’à partir des années 2000, a prouvé son efficacité pour effectuer de nombreuses réactions permettant de créer plusieurs liaisons carbone-carbone ou carbone-hétéroatome en une étape. Les conditions douces et la grande tolérance des catalyseurs d’or vis-à-vis de groupements fonctionnels divers ont naturellement mené à l’application de la catalyse à l’or à la synthèse de produits naturels. Ces études s’inscrivent dans cette dynamique et exploitent la réactivité d’azacycles contraints et d’alcynes en présence d’or(I) pour former des squelettes hétérocycliques couramment rencontrés au sein de produits naturels. La réactivité particulière des groupements sulfonyles protecteurs de l’azote a également été étudiée pour synthétiser différentes molécules azabicycliques. Les méthodes de synthèse mises au point ont finalement été appliquées à la synthèse de molécules cibles
Nature is a nearly endless source of molecules, often possessing remarkable biological properties. Thus, plants provide new structures every day, inspiring chemists to synthetically create similar molecules or analogs, which are potential therapeutic agents for example. The emergence of organometallic chemistry allowed for considerable improvement of synthetic methods to make complex molecular scaffolds. Homogeneous gold catalysis, whose potential has only been explored starting from 2000, proved its efficiency to make numerous reactions. Most of them can generate several carbon-carbon or carbon-heteroatom bonds in one step. Soft conditions as well as good tolerance of gold catalysts toward multiple functional groups naturally led to the application of gold-catalyzed steps in various total syntheses of natural products.The present study evolves in this context and explores the reactivity of strained azacycles and alkynes in the presence of gold(I) to form heterocyclic skeletons that are commonly found in natural products. The specific reactivity of sulfonyl nitrogen-protecting groups has also been studied to synthesize azabicyclic compounds. The application of those various new methodologies to the synthesis of target molecules has finally been studied
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Walker, P. Ross. "Synthesis of mono- and bicyclic azacycles via palladium- and ruthenium-catalysed enynamide cycloisomerisation." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:c5c072f8-920a-4894-8223-179fb81db67f.

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The initial aim of this project was to investigate ways of synthesising fused, spirocyclic and linked bicyclic amines. We built on methodology previously developed within our group, employing cyclic dienamides, prepared using the reductive cyclisation of bromoenynamides, as key structural building blocks for further annulation. In the course of investigating the reactivity of these cyclic dienamides, we discovered a new efficient and general route to their synthesis, by employing palladium- or ruthenium-catalysed enynamide cycloisomerisation. A wide range of attractive dienamide scaffolds were synthesised from simple enynamide precursors in rapid, high yielding and operationally simple reactions, underlining their potential utility as an atom-economical source of azacycles. Chiral enynamide substrates were used to generate 1,4-dienamides as a single diastereomer at the newly formed (quaternary) stereocentre. This relay of stereochemistry was exploited not only in the formation of monocyclic dienamides, but even in the formation of a spirocyclic product, and this bodes well for further stereocontrolled synthesis of polysubstituted azacycles. Finally the palladium- and ruthenium-catalysed cycloisomerisation of enynamides was discussed and investigated mechanistically, utilising 1H NMR spectroscopy, timecourse and deuterium-labelling experiments.
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Gerlach, Kai. "Synthese neuartiger bicyclischer Konjugate von Azacyclen mit 5-Hydroxyfuranonen als potentielle Phospholipase-A2-Inhibitoren." [S.l. : s.n.], 1997. http://deposit.ddb.de/cgi-bin/dokserv?idn=959319689.

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Urbina-Gonzalez, Juan-Manuel. "Fused and spiro furanones from tetronic acid synthons oxa and azacycles featuring the butenolide ring /." [S.l.] : [s.n.], 2006. http://deposit.ddb.de/cgi-bin/dokserv?idn=982351690.

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Daniels, David S. B. "Reactions of allenylpalladium intermediates in organic synthesis." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:61054889-d0ac-4d08-96a7-2e05fb3aa455.

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This thesis describes our examination of the reactivity of allenylpalladium intermediates generated from the reaction of palladium(0) with propargylic electrophiles. Chapter 1 provides a general overview of the literature reported to date concerning the nature and reactivity of allenylpalladium intermediates. The coupling of a variety of propargylic electrophiles with aryl boronic acids to form allenes is examined in Chapter 2. However, when employing diastereomerically pure electrophiles, some erosion of stereochemistry was observed in the allene products. This effect was examined further, and epimerisation of the allene product was found to be the origin of the loss of stereochemistry. Evidence for the species likely responsible for this epimerisation is presented. The serendipitous formation of tetrahydrofurans (THFs) from propargylic 7-membered cyclic carbonates prompted an in-depth examination of this reactivity, as described in Chapter 3. The reaction of these cyclic carbonates was rendered stereoselective and the stereochemical outcome of the reaction elucidated. The methodology was extended to propargylic acyclic carbonates which allowed the formation of tetrahydropyrans (THPs). The effect of ring-size and substituents on the cyclisations was examined, culminating in the formation of two rings in a single step from diol-containing bis-carbonates. Chapter 4 describes the extension of this methodology to the formation of azacyclic products. This built upon foundation work conducted by a Part II student within the group, and further improved the selectivity of the reaction. Two diverse azacyclic skeletons could be formed from the same substrate by the employment of different bidentate phosphine ligands, and a variety of substrates were examined under these conditions. Chapter 5 draws general conclusions and sets out possible future directions for the methodology, and full experimental details are outlined in Chapter 6.
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Book chapters on the topic "Azacycle"

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Wang, Yinli. "Oxa- and Azacycle-Formation via Migrative Cyclization of Sulfonylalkynol and Sulfonylalkynamide." In Springer Theses, 13–63. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-9398-3_2.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of trinuclear lanthanum(III)-nickel(II), La2-Ni, complex with 13-membered macrocycle, 1, 5, 8, 11-tetra-azacyclo tridecane-2, 4-dione." In Magnetic Properties of Paramagnetic Compounds, 1194–95. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-53971-2_637.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of trinuclear lanthanum(III)-copper(II), La2-Cu, complex with 13-membered macrocycle, 1, 5, 8, 11-tetra-azacyclo tridecane-2, 4-dione." In Magnetic Properties of Paramagnetic Compounds, 360–61. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-53974-3_187.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of trinuclear lanthanum(III)-cobalt(II), La2-Co, complex with 13-membered macrocycle, 1, 5, 8, 11-tetra-azacyclo tridecane-2, 4-dione." In Magnetic Properties of Paramagnetic Compounds, 699–700. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-53971-2_367.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of trinuclear lanthanum(III)-manganese(II), La2-Mn, complex with 13-membered macrocycle, 1, 5, 8, 11-tetra-azacyclo tridecane-2, 4-dione." In Magnetic Properties of Paramagnetic Compounds, 1318–19. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-49202-4_646.

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Taber, Douglass F. "Alkaloid Synthesis: Penaresidin A (Subba Reddy), Allokainic Acid (Saicic), Sedacryptine (Rutjes), Lepistine (Yokoshima/Fukuyama), Septicine (Hanessian), Lyconadin C (Dai)." In Organic Synthesis. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780190646165.003.0058.

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Penaresidin A 3, isolated from the Okinawan marine sponge Penares sp., is a potent activator of actomyosin ATPase. B. V. Subba Reddy of the Indian Institute of Chemical Technology prepared (Tetrahedron Lett. 2014, 55, 49) the azetidine ring of 3 by mesyl­ation of the hydroxy sulfonamide 2, derived from 1, followed by cyclization. Allokainic acid 6 has become a useful tool for neurological studies. Radomir N. Saicic of the University of Belgrade found (Org. Lett. 2014, 16, 34) that the Tsuji–Trost cyclization of 4 to 5 proceeded with high diastereoselectivity, presumably by way of the enamine of the aldehyde. Floris P. J. T. Rutjes of Radboud University Nijmegen prepared (Org. Lett. 2014, 16, 2038) the starting material 7 for (−)-sedacryptine 9 via an enantioselective Mannich addition. The reagent of choice for the Aza–Achmatowicz rearrangement of 7 to 8 proved to be mCPBA. The intriguing tricyclic alkaloid (−)-lepistine 12 was isolated from the mushroom Clitocybe fasciculate. En route to the first-ever synthesis of 12, Satoshi Yokoshima and Tohru Fukuyama of Nagoya University cyclized (Org. Lett. 2014, 16, 2862) the gly­cidol-derived sulfonamide 10 to the azacycle 11. (+)-Septicine 15 is the biogenetic precursor to the phenanthrene alkaloid (+)-tylophorine. Stephen Hanessian of the Université de Montréal prepared (Org. Lett. 2014, 16, 232) 15 by condensing the proline-derived ketone 13 with the aldehyde 14. Mingji Dai of Purdue University elaborated (Angew. Chem. Int. Ed. 2014, 53, 3922) the amine 16 to the enone 17 by intramolecular Mannich alkylation followed by methylenation and allylic oxidation. Condensation with the sulfoxide 18 then delivered lyconadin C 19.
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"Stereocontrolled Construction of Azacyclic Natural Products." In Organic Synthesis: State of the 2005-2007, 37–38. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2008. http://dx.doi.org/10.1002/9780470385975.ch19.

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