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Academic literature on the topic 'Pyridines'

Author: Grafiati

Published: 4 June 2021

Last updated: 30 July 2024

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Journal articles on the topic "Pyridines"

McNally, Andrew, Ryan Dolewski, and Michael Hilton. "4-Selective Pyridine Functionalization Reactions via Heterocyclic Phosphonium Salts." Synlett 29, no. 01 (December 12, 2017): 08–14. http://dx.doi.org/10.1055/s-0036-1591850.

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Pyridines are widely used across the chemical sciences in applications ranging from pharmaceuticals, ligands for metal complex and battery technologies. Direct functionalization of pyridine C–H bonds is an important strategy to make useful pyridine derivatives, but there are few ways to selectively transform the 4-position of the scaffold. We recently reported that pyridines can be converted into heterocyclic phosphonium salts that can serve as generic handles for multiple subsequent bond-forming processes. Reactions with nucleophiles and transition-metal cross-couplings will be described to make C–O, C–S, C–N, and C–C bonds in a diverse range of pyridines including those embedded in complex pharmaceuticals.1 Introduction2 Direct, Regioselective Functionalization of Pyridines3 4-Position Selectivity via Metal Catalysis4 Versatile Functional Groups versus Specific Bond Constructions5 Phosphonium Salts as Reagents for Pyridine Functionalization6 Conclusions

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Czarnocki, Zbigniew, and Piotr Pomarański. "Arylpyridines: A Review from Selective Synthesis to Atropisomerism." Synthesis 51, no. 03 (December 14, 2018): 587–611. http://dx.doi.org/10.1055/s-0037-1611365.

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Multiply arylated heterocycles are interesting structures with highly useful functions and fascinating optoelectronic and biological properties. Pyridines are an important class of compounds, playing a role in various fields of chemistry. When the pyridine ring is connected to other aromatic systems, novel stereochemical outcomes may arise. This work summarizes different methodologies applied for the synthesis of substituted arylpyridine derivatives and summarizes stereochemical phenomena resulting from atropisomerism present in certain arylated pyridines.1 Introduction2 Arylpyridines Containing meta- and para-Substituted Phenyl Groups2.1 Arylpyridine Derivatives as Amphetamine Analogues Markers2.2 Site-Selective Synthesis of Arylpyridines3 Atropisomerism in Arylpyridines Containing ortho-Substituted Phenyl Groups3.1 Synthesis of Arylpyridines Containing ortho-Substituted Phenyl Groups3.2 Other Methods for the Preparation of Arylated Pyridines4 Fully Substituted Pyridine Derivatives4.1 Site-Selective Synthesis of Fully Arylated Pyridines4.3 Atropisomerism in Densely Substituted Arylpyridines Containing ortho-Substituted Phenyl Groups5 Enantioselective Synthesis of Arylpyridine Derivatives6 Conclusion

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Zhang, Li-Juan, Qun Wu, Jing Sun, and Chao-Guo Yan. "Synthesis of functionalized spiro[indoline-3,4’-pyridines] and spiro[indoline-3,4’-pyridinones] via one-pot four-component reactions." Beilstein Journal of Organic Chemistry 9 (May 2, 2013): 846–51. http://dx.doi.org/10.3762/bjoc.9.97.

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In the presence of triethylamine as catalyst, the one-pot four-component reactions of arylamines, methyl propiolate, isatin and malononitrile afforded the functionalized spiro[indoline-3,4’-pyridine] derivatives in good yields. Similar reactions with ethyl cyanoacetate successfully afforded the functionalized spiro[indoline-3,4’-pyridines] and spiro[indoline-3,4’-pyridinones] as the main products according to the structures of the arylamines and other primary amines.

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Brugarolas, P., R. Freifelder, S. H. Cheng, and O. DeJesus. "Synthesis of meta-substituted [18F]3-fluoro-4-aminopyridine via direct radiofluorination of pyridine N-oxides." Chemical Communications 52, no. 44 (2016): 7150–52. http://dx.doi.org/10.1039/c6cc02362b.

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Fluorination and radiofluorination of pyridines is challenging, especially in meta position. Here we describe a new chemical reaction to generate meta fluorinated pyridines: halogen substitution on pyridine N-oxides followed by reduction.

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Balkenhohl, Moritz, and Paul Knochel. "Regioselective C–H Activation of Substituted Pyridines and other Azines using Mg- and Zn-TMP-Bases." SynOpen 02, no. 01 (January 2018): 0078–95. http://dx.doi.org/10.1055/s-0036-1591966.

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The metalation of substituted pyridines, diazines and related N-heterocycles using TMPMgCl·LiCl, TMP2Mg·2LiCl, TMPZnCl·LiCl or TMP2Zn·2LiCl2·2MgCl2 (TMP = 2,2,6,6-tetramethylpiperidyl) in the presence or absence of a Lewis acid is reviewed. Contents 1 Introduction2 Magnesiation of Pyridines and Related Azines2.1 Magnesiations using TMPMgCl·LiCl2.2 Magnesiations using TMP2Mg·2LiCl and Related Bases2.3 BF3·OEt2 Promoted Metalations of Pyridines3 Zincation of Pyridines and Related Azines using TMPZnCl·LiCl and TMP2Zn·2LiCl·2MgCl2 4 Metalation of Pyridines using other TMP-Bases5 Magnesiation and Zincation of Diazines6 Conclusion

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Mallisetty, Naga Mohan, Hanumantharao Ganipisetti, Debendra Majhi, and Venkata Nagendra Kumar Putta. "Design, Synthesis of Some New Scaffolds based on Pyrrolyl-Pyridines as Potential Anticancer Agents." Asian Journal of Chemistry 35, no. 2 (2023): 468–74. http://dx.doi.org/10.14233/ajchem.2023.23974.

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Pyrrolyl-pyridine heterocyclic compounds have received considerable attention because of its unique bioisosteric properties and an unusually wide spectrum of biological activities. Thus, it is a perfect framework for the synthesis of novel C–N, C–C bond formations like 5-substituted-1-benzyl-1Hpyrrolo[ 2,3-b]pyridines (3), 2-(1H-pyrrolo[2,3-b]pyridin-5-yl)phenol (5) and screened for their anticancer activity. The synthesized compounds were characterized by 1H NMR, 13C NMR, IR, mass spectral techniques and elemental analysis. The outcomes of these compounds 2,6-difluorobenzylpyrrolidin- 1H-pyrrolo[2,3-b]pyridine, 2,6-difluorobenzyl-N,N-dimethyl-1H-pyrrolo[2,3-b]-pyridin-5-amine had a signicant anticancer activity against human cervical cancer cell line (Hela) with IC50 4.8, 9.7 μg/mL and whereas pyrrolo[2,3-b]pyridin-5-phenol, pyrrolo[2,3-b]pyridin-5-vinylphenol are active against human breast cancer cell line (MCF-7) with IC50 8.1, 3.2 μg/mL, respectively.

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Gad-Elkareem, Mohamed A. M., Azza M. Abdel-Fattah, and Mohamed A. A. Elneairy. "Pyrazolo[3,4-b]pyridine in heterocyclic synthesis: synthesis of new pyrazolo[3,4-b]pyridines, imidazo[1',2':1,5]pyrazolo[3,4-b]pyridines, and pyrido[2',3':3,4]pyrazolo[1,5-a]pyrimidines." Canadian Journal of Chemistry 85, no. 9 (September 1, 2007): 592–99. http://dx.doi.org/10.1139/v07-089.

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Pyrazolo[3,4-b]pyridine derivatives 7 and 9 were synthesized via the reaction of 3-amino-1H-pyrazolo-[3,4-b]pyridine derivative 2 with ω-bromoacetophenones. Reaction of 7 and 9 with Ac2O afforded the imidazo[1',2':1,5]py razolo[3,4-b]pyridine derivative 8 and pyrazolo[3,4-b]pyridine derivative 10, respectively. Reaction of 2 with chloroacetonitrile followed by DMF-DMA gave imidazo[1',2':1,5]pyrazolo[3,4-b]pyridines 4 and 5, respectively. Acetyl acetone and 1,1-dicyano-2,2-dimethylthioethene were reacted with 2 to afford the pyrido[2',3':3,4]pyrazolo-[1,5-a]-pyrimidines 11 and 14, respectively. Also, 2 reacted with DMF-DMA to yield the formamidine 15, which in turn, reacted with active methylene reagents, yielding the corresponding pyrido[2',3':3,4]pyrazolo[1,5-a]pyrimidines 18 and 23a-23d.Key words: 1H-pyrazolo[3,4-b]pyridines, imidazo[1',2':1,5]pyrazolo[3,4-b]pyridines, pyrido[2',3':3,4]pyrazolo[1,5-a]pyrimidines.

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Preston, Dan, Samantha M. McNeill, James E. M. Lewis, Gregory I. Giles, and James D. Crowley. "Enhanced kinetic stability of [Pd2L4]4+ cages through ligand substitution." Dalton Transactions 45, no. 19 (2016): 8050–60. http://dx.doi.org/10.1039/c6dt00133e.

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[Pd₂(tripy)₄]⁴⁺ cage architectures (where tripy = 2,6-bis(pyridin-3-ylethynyl)pyridine) were made more kinetically robust in the presence of range of nucleophiles by the addition of amino groups in either the 2-(2A-tripy) or 3-(3A-tripy) positions of the tripy ligands' terminal pyridines, with the [Pd₂(2A-tripy)₄]⁴⁺ cage proving the most stable.

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Barlin, GB. "Heterocyclic Amplifiers of Phleomycin. VIII. Mono- Bis-(5'-substituted 1',3',4'-thiadiazol-2'-yl)pyridines and Mono(5'-substituted 1',3',4'-thiadiazol-2'-ylmethyl)pyridines." Australian Journal of Chemistry 38, no. 10 (1985): 1491. http://dx.doi.org/10.1071/ch9851491.

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A series of mono- and bis -(5′-substituted 1′,3′,4′-thiadiazol-2′- yl )pyridines with strongly basic side chains, e.g., 3,5-bis[5′(2′-N,N- dimethylaminoethylthio )-1′,3′,4′-thiadiazol-2′-yl]pyridine (1), and (5?-substituted 1′,3′,4′-thiadiazol-2′-ylmethyl)pyridines have been prepared for evaluation as amplifiers of phleomycin. Five of the six bis (5′-substituted 1′,3′,4′-thiadiazol-2′-yl)pyridines were themselves antibacterial under the test conditions, but compound (1) and the mono(5′-substituted 1′,3′,4′-thiadiazol-2′-yl)-pyridines and -methylpyridines displayed moderate two-to-three-star activity.

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Schmitt, Martine, Jean-Jacques Bourguignon, Gordon B. Barlin, and Les P. Davies. "Imidazo[1,2-b]pyridazines. XXIII Some 5-Deaza Analogues. Syntheses of Some 2-Aryl-6-(chloro, methoxy or unsubstituted)-3- (variously substituted)imidazo[1,2-a]pyridines and Their Affinity for Central and Mitochondrial Benzodiazepine Receptor." Australian Journal of Chemistry 50, no. 7 (1997): 719. http://dx.doi.org/10.1071/c97004.

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The syntheses of ethyl {2′-aryl-6′-(chloro, methoxy and unsubstituted)imidazo[1,2-a]pyridin-3′-yl}-2- (acylamino, acetoxy and hydroxy)acetates, 3-benzamidomethyl-2-benzoyl-6-(chloro and methoxy)imidazo-[1,2-a]pyridines, 3-amino-6-chloro-2-phenylimidazo[1,2-a]pyridine and ethyl 2-(2′-phenylimidazo[1,2-a]pyridin-3′-yl)acetate are reported. The ability of these compounds to displace [3H]diazepam from central and mitochondrial (peripheral-type) benzodiazepine receptors has been examined. Ethyl 2-benzamido-2-{6′-chloro-2′-(4′′-chlorophenyl)imidazo[1,2-a]pyridin-3′-yl} acetate (21) was selective for peripheral-type receptors (IC5013 nM) but none bound strongly to central receptors.

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Dissertations / Theses on the topic "Pyridines"

Brice, Heloise. "Dearomatising cyclisations onto pyridines." Thesis, University of Manchester, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.496237.

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This thesis details investigations into the dearomatising cyclisation onto pyridines. Studies into the cyclisation of enolate or silyl enol ether nucleophiles onto a pyridine ring are described. Flexible hydrocarbon tethers and tethers incorporating either an oxygen or nitrogen atom were investigated and novel fused 6.5 and 6.6 bicyclic piperidines have been synthesised. A one-pot silyl enol ether or silyl ketene acetal formation and cyclisation procedure has been developed.

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Altuna-Urquijo, M. "New routes to functionalised pyridines." Thesis, Northumbria University, 2005. http://nrl.northumbria.ac.uk/3327/.

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A novel method of preparing substituted pyridines has been developed. This method uses readily available [3-ketoesters and amidrazone as starting materials. The pyridines obtained do not require purification and different substitution patterns, not available by known methods, can be obtained. The formation of 1,2,3-tricarbonyl compounds was achieved by oxidation of the alcohol precursors, following two different methods. a-Chloro-ct-acetoxy-f3-dicarbonyls were prepared in excellent yields and were shown to react as tricarbonyl equivalents in the formation of 1,2,4-triazines. Regioselective condensation reactions were observed between different amidrazones with tricarbonyl and tricarbonyl equivalents to produce a series of novel 1,2,4-triazines in good yields with no contamination by any regioisomer. When 1,2,4-triazines were obtained from a-chloro-a-acetoxy-P-dicarbonyls, 2.5 equivalents of amidrazone were required. However, decomposition of a-chloro-a-acetoxy-P-dicarbonyls prior to reaction with 1 equivalent of amidrazone yielded the 1,2,4-triazines in good yields. These 1,2,4-triazines underwent aza Diels-Alder cycloaddition reactions with 2,5- norbornadiene to give a series of novel 2,3,6-trisubstituted pyridines. The pyridines bearing electron withdrawing groups as substituents could also be obtained in a 'one- pot' reaction from their corresponding tricarbonyls or tricarbonyl derivatives. The 1,2,4- triazines bearing electron donating groups could be converted to their corresponding pyridines either by changing the reaction conditions or, when possible, by conversion of the electron donating group into a more electron withdrawing substituent by oxidation (e.g. sulphoxide substituent). Pyridines bearing a sulphoxide substituent undergo nucleophilic substitutions, giving great scope to introduce different functionality in the C-6 of the pyridines.

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Harrington, Keith Anthony. "Regioselective synthesis of functionalised pyridines." Thesis, University of Leeds, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.329948.

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Bouteau, Brigitte. "Synthèse et étude physicochimique de pyrrolyl-pyridines, pyrido (2,3-c) pyrrolo (1,2-e) triazépines-1,2,5, triazolo-1,2,4 (4,5-a) pyridines, triazolo (1,2,4) (2,3-a) pyridines." Caen, 1989. http://www.theses.fr/1989CAEN4051.

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Cadu, Alban. "Iridium Catalysed Asymmetric Hydrogenation of Pyridines." Licentiate thesis, Uppsala universitet, Syntetisk organisk kemi, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-212413.

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This thesis presents the hydrogenation of substituted pyridines using N,P-ligated iridium catalystsin homogeneous media. These iridium catalysts were developed within this research group in thepast decade. This method of hydrogenation is highly stereoselective, and in several cases good to excellent ees were obtained.The hydrogenation of substituted pyridines was studied: by screening for the catalyst giving thehighest conversion and ee, by optimising the reaction conditions and by attempting to improve existingcatalysts. New substrates were synthesised for this process, in particular alkyl substituted Nprotectedpyridines. Their reduction provided chiral piperidines, which could be used as chiralbuilding blocks once deprotected.

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McConnell, Stuart. "2-functionalised pyridines with transition metals." Thesis, Queen Mary, University of London, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.243479.

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Mace, Laura H. "Developing the partial reduction of pyridines." Thesis, University of Oxford, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.398101.

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Gehre, Alexander. "Development of novel routes to pyridines." Thesis, Northumbria University, 2008. http://nrl.northumbria.ac.uk/3533/.

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Pyridines occupy a central part in modern day organic chemistry. Recent studies in various fields of chemistry, biology and physics have featured numerous examples and applications of these compounds. The purpose of this study was to produce a library of polysubstituted pyridines, 2,2'-bipyridines and 2,2':6',2"-terpyridines via pathways that allowed unusual or even unique substitution patterns. To achieve a generic pyridine synthesis that delivers a diversity of products tailored to different industrial needs, a strategy by which the target molecule is constructed in a [2+2+2]-manner was chosen, i.e. the six atoms of the pyridine ring and their pendant functionalities are traced back to three building blocks, each delivering two atoms to the pyridine ring. A range of a-acetoxy-a-chloro-P-keto esters were prepared in three steps from commercially available P-keto esters through a-chlorination with sulfuryl chloride, a-acetoxylation with acetic acid and triethylamine and a second a-chlorination in good overall yields (69 — 89 %) without the need for chromatographic purification. These a-acetoxy-a-chloro-j3-keto esters served as equivalents for a,[3-diketo esters (building block 1) in the synthesis of various 1,2,4- triazines through condensation with picolinohydrazonamides or thiosemicarbazides (building block 2). A subsequent aza Diels-Alder reaction of these 1,2,4-triazines with electron-rich dienophiles (building block 3) such as 2,5-norbornadiene, 1-pyrrolidino- 1 -cyclopentene and 2,3-dihydrofuran furnished an array of novel polysubstitued (bi)pyridines. The two-step sequence of condensation and aza Diels-Alder reaction could be advanced into a 'one-pot' synthesis on several occasions. Furthermore, we devised a feasible synthetic alternative towards a,(3-diketo esters. Alpha-picolinoyl-3-keto esters were prepared from the same starting materials as the a-acetoxy-a¬chloro-P-keto esters in a shortened two-step sequence of a-chlorination of P-keto esters with sulfuryl chloride and replacement of the chloro group by a picolinoyl group using picolinic acid and KHCO3. The overall yields of a-picolinoyl-f3-keto esters (55 — 91 %) were comparable to those of the a-acetoxy-a-chloro-P-keto esters. Copper(II) acetate-facilitated methanolysis of a-picolinoyl-P-keto esters and immediate oxidation of the in situ generated a-hydroxy-P-keto esters by excess copper(II) acetate afforded a,(3-diketo esters which reacted with hydrazonamides in the same manner as the a-chloro-a-acetoxy-P-keto esters. However, in terms of product purity and yield the `chloroacetate route' remains the superior strategy.

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Chen, Quan. "BF3-mediated direct functionalizations of pyridines." Diss., Ludwig-Maximilians-Universität München, 2014. http://nbn-resolving.de/urn:nbn:de:bvb:19-175551.

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Galley, Carl Maurice Swedler. "Some chemistry of pyridines and pyridones." Thesis, University of Bristol, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.412833.

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Books on the topic "Pyridines"

Andrews, Ian Philip. Hypervalent iodine oxidations of substituted pyridines. Norwich: University of East Anglia, 1992.

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Heo, Christina K. M. Quantitative studies on the addition of pyridines to Michael acceptors. Ottawa: National Library of Canada, 1990.

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Banting, Lee. Synthesis and evaluation of perhydroimidazolo [3,4-a] pyridines as fungicides. Portsmouth: Portsmouth Polytechnic, Dept. of Chemistry, 1985.

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Omar, Abdirahman Hagi Hassan. Reactions of trihalomethyl derivatives of pyridines and pyrimidines with nucleophiles. Salford: University of Salford, 1986.

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United States. National Aeronautics and Space Administration., ed. Synthesis and characterization of the first main group oxo-centered trinuclear carboxylate: Final report, 1/16/90 to 3/31/94. [Washington, DC: National Aeronautics and Space Administration, 1994.

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Trethewey, Andrew Nicholas. Synthesis and evaluation of perhydro-oxazolo [3,4-a] pyridines as fungicides. Portsmouth: Portsmouth Polytechnic, 1985.

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V, Auping Judith, Meador Michael A, and United States. National Aeronautics and Space Administration., eds. Synthesis of substituted 2,3,5,6-tetraarylbenzo(1,2-b:5,4-b')difurans. [Washington, DC: National Aeronautics and Space Administration, 1995.

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United States. Agency for Toxic Substances and Disease Registry. Division of Toxicology. Pyridine. Atlanta, GA: Division of Toxicology, Dept. of Health and Human Services, Public Health Service, Agency for Toxic Substances Disease Registry, 1992.

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G, Bartholini, ed. Imidazopyridines in anxiety disorders: A novel experimental and therapeutic approach. New York: Raven Press, 1993.

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P, Sauvanet J., Langer S. Z, Morselli Paolo Lucio, and Laboratoires d'études et de recherches Synthélabo., eds. Imidazopyridines in sleep disorders: A novel experimental and therapeutic approach. New York: Raven Press, 1988.

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Book chapters on the topic "Pyridines"

Brown, E. G. "Pyridines." In Ring Nitrogen and Key Biomolecules, 68–87. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-4906-8_4.

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Newkome, G. R., V. K. Gupta, and J. D. Sauer. "Macrocyclic Pyridines." In Chemistry of Heterocyclic Compounds: A Series Of Monographs, 447–633. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2008. http://dx.doi.org/10.1002/9780470186701.ch3.

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Coutts, R. T., and A. F. Casy. "Pyridines and Reduced Pyridines of Pharmacological Interest." In Chemistry of Heterocyclic Compounds: A Series Of Monographs, 445–524. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2008. http://dx.doi.org/10.1002/9780470186695.ch4.

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Thummel, R. P. "Carbocyclic Annelated Pyridines." In Chemistry of Heterocyclic Compounds: A Series Of Monographs, 253–445. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2008. http://dx.doi.org/10.1002/9780470186701.ch2.

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Shestopalov, Anatoliy M., Lyudmila A. Rodinovskaya, Valeri Yu Mortikov, and Alexander E. Fedorov. "Synthesis of Fluorinated Pyridines." In Fluorine in Heterocyclic Chemistry Volume 2, 1–58. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-04435-4_1.

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Lickfeldt, Darin W., Denise P. Cudworth, Daniel D. Loughner, and Lowell D. Markley. "Microtubulin Assembly Inhibitors (Pyridines)." In Modern Crop Protection Compounds, 439–45. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2012. http://dx.doi.org/10.1002/9783527644179.ch10.

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Joule, J. A., K. Mills, and G. F. Smith. "Pyridines: reactions and synthesis." In Heterocyclic Chemistry, 72–119. Boston, MA: Springer US, 1995. http://dx.doi.org/10.1007/978-1-4899-3222-8_5.

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González-Bello, Concepción, and Luis Castedo. "Six-Membered Heterocycles: Pyridines." In Modern Heterocyclic Chemistry, 1431–525. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2011. http://dx.doi.org/10.1002/9783527637737.ch16.

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Lickfeldt, Darin W., Denise P. Cudworth, Daniel D. Loughner, and Lowell D. Markley. "Microtubulin Assembly Inhibitors (Pyridines)." In Modern Crop Protection Compounds, 493–500. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2019. http://dx.doi.org/10.1002/9783527699261.ch10.

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Lyle, Robert E. "Part B. Partially Reduced Pyridines." In Chemistry of Heterocyclic Compounds: A Series Of Monographs, 137–82. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2008. http://dx.doi.org/10.1002/9780470186633.ch2.

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Conference papers on the topic "Pyridines"

Dotsenko, Victor, Darya Lukina, and Angela Stolyarova. "Synthesis of new functionalized thieno[2,3-b]pyridines." In The 21st International Electronic Conference on Synthetic Organic Chemistry. Basel, Switzerland: MDPI, 2017. http://dx.doi.org/10.3390/ecsoc-21-04853.

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Dotsenko, Victor, and Sergey Krivokolysko. "On the reaction of indole-3-carbaldehyde with cyanothioacetamide: an unexpected approach to indolyl-substituted pyridines and thieno[2,3-b]pyridines." In The 21st International Electronic Conference on Synthetic Organic Chemistry. Basel, Switzerland: MDPI, 2017. http://dx.doi.org/10.3390/ecsoc-21-04802.

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Pelosi, André Gasparotto, Leandro H. Zucolotto Cocca, Sandrine Piguel, Leonardo De Boni, and Cleber R. Mendonça. "Spectroscopy Study in Styryl Imidazo[4,5-b]Pyridine Derivatives." In Latin America Optics and Photonics Conference. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/laop.2022.m2a.3.

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A study of two-photon absorption cross-section (2PACS) in imidazo[4,5-b]pyridines grafted to different groups was done. A 2PACS of around 150 GM and 10 GM was observed at 540 nm and 700 nm, respectively.

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Muraviev, V. S., and L. V. Dyaduchenko. "THIENO[2,3-B]PYRIDINES DERIVATIVES AS SOYBEAN PLANT GROWTH REGULATORS." In STATE AND DEVELOPMENT PROSPECTS OF AGRIBUSINESS Volume 2. DSTU-Print, 2020. http://dx.doi.org/10.23947/interagro.2020.2.683-686.

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We have carried out the synthesis and screening of soybean growth regulators in a series of substituted thieno[2,3-b]pyridines. The compounds, which have a high growth-regulating effect, were detected. According to the field tests, the substances have a positive effect in formation of the yield structure and provide seed quality.

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Valverde, J. V. P., A. G. Pelosi, L. H. Z. Cocca, O. D. Marbello, S. Piguel, L. de Boni, and C. R. Mendonça. "Study of Two-Photon Absorption in Imidazo[1,2-a]Pyridines Derivatives." In Latin America Optics and Photonics Conference. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/laop.2022.tu4a.57.

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In this work, the spectroscopic properties of Imidazo[1,2-a]pyridine derivatives were investigated, as well as the two-photon absorption process. An increase in the 2PA cross-section was shown with the different structures of the molecules.

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Kneeteman, Maria. "Nitro-pyridines as Dienophiles in Polar Diels-alder Reactions. A DFT Theoretical Study." In The 16th International Electronic Conference on Synthetic Organic Chemistry. Basel, Switzerland: MDPI, 2012. http://dx.doi.org/10.3390/ecsoc-16-01086.

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Трофимов, Б., B. Trofimov, Н. Гусарова, and N. Gusarova. "The development of original methodologies of directed synthesis of le-Carbs their analogs and precursors base donacetylene and its derivatives." In Topical issues of translational medicine: a collection of articles dedicated to the 5th anniversary of the day The creation of a department for biomedical research and technology of the Irkutsk Scientific Center Siberian Branch of RAS. Москва: INFRA-M Academic Publishing LLC., 2017. http://dx.doi.org/10.12737/conferencearticle_58be81ec92d17.

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New reactions, which have been discovered and continue to be developed in A.E. Favorsky Irkutsk institute of chemistry SB RAS on the basis of acetylene, a product of oil, gas and coal processing and multi-faceted building block for organic synthesis, have been considered. These reactions provide for the shortest routes to construction of fundamental heterocyclic scaffolds (pyrroles, imidazoles, pyrazoles, indoles, pyridines, dihydropyridines, etc.) with desirable and optimum combination of functional pharmacophoric groups and fragments, which are responsible for antiviral (HIV, flu), antitumor, tuberculostatic and hypotensive activities.

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Sharma, R. "The study of dielectric response in binary mixtures of dimethyl substituted pyridines at microwave frequency." In Proceedings of 2005 International Symposium on Electrical Insulating Materials, 2005. (ISEIM 2005). IEEE, 2005. http://dx.doi.org/10.1109/iseim.2005.193330.

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Ducray, Richard, Iain Simpson, Clifford D. Jones, Jon Curwen, Catherine B. Trigwell, Margaret H. Veldman-Jones, Martina Fitzek, et al. "Abstract B238: Novel imidazo[1,2-a]pyridines as inhibitors of the IGF-1R tyrosine kinase." In Abstracts: AACR-NCI-EORTC International Conference: Molecular Targets and Cancer Therapeutics--Nov 12-16, 2011; San Francisco, CA. American Association for Cancer Research, 2011. http://dx.doi.org/10.1158/1535-7163.targ-11-b238.

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Vanden Eynde, Jean Jacques, Térence Honoré, Annie Mayence, and Tien Huang. "Identification of a Hit in a Small Library of Potential Antiplasmodial Imidazo[4,5-b]pyridines." In 1st International Electronic Conference on Medicinal Chemistry. Basel, Switzerland: MDPI, 2015. http://dx.doi.org/10.3390/ecmc-1-a034.

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Reports on the topic "Pyridines"

Lowe-Ma, Charlotte K., Robin A. Nissan, and William S. Wilson. Tetrazolo(1,5-A)pyridines and Furazano(4,5-B)pyridine-1-oxides as Energetic Materials. Fort Belvoir, VA: Defense Technical Information Center, April 1989. http://dx.doi.org/10.21236/ada209357.

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Khasaeva, Fatima, Igor Parshikov, and Evgeny Zaraisky. Degradation of 2,6-dimethylpyridine by Arthrobacter crystallopoietes. Intellectual Archive, December 2020. http://dx.doi.org/10.32370/iaj.2463.

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Degradation of pyridines in waste water is an important issue for chemical and pharmaceutical industries. The biodegradation of 2,6-dimethylpyridine was investigated by the bacterium Arthrobacter crystallopoietes KM-4, which resulted in the formation of three metabolites: 2,6-dimethylpyridin-3-ol, 2,6-dimethylpyridin- 3,4-diol, and 2,4-dioxopentanoic acid.

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Hellier, Paul C., Jerald S. Bradshaw, and Reed M. Izatt. Synthesis of Chiral Pyridine-Based Macrobicyclic Clefts. Fort Belvoir, VA: Defense Technical Information Center, May 1996. http://dx.doi.org/10.21236/ada309257.

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Auburn, P. R., E. S. Dodsworth, M. A. Haga, W. Liu, and W. A. Nevin. Bis(Dioxolene)Bis(Pyridine)Ruthenium Redox Series. Fort Belvoir, VA: Defense Technical Information Center, August 1991. http://dx.doi.org/10.21236/ada240290.

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Essington, M., and B. Hart. Adsorption of pyridine by combusted oil shale. Office of Scientific and Technical Information (OSTI), March 1990. http://dx.doi.org/10.2172/6346070.

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Blatchford, J. W., S. W. Jessen, L. B. Lin, T. L. Gustafson, and A. J. Epstein. Photoluminescence in Pyridine-Based Polymers: Role of Aggregates. Fort Belvoir, VA: Defense Technical Information Center, September 1997. http://dx.doi.org/10.21236/ada330183.

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Parshikov, Igor. Microbial Transformation of Some Ethylpyridines by Fungi. Intellectual Archive, January 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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Stolberg, L., J. Lipkowski, and D. E. Irish. Adsorption of Pyridine at the Au(311) - Solution Interface. Fort Belvoir, VA: Defense Technical Information Center, February 1991. http://dx.doi.org/10.21236/ada232823.

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Mudge, Christopher, Bradley Sartain, Benjamin Sperry, and Kurt Getsinger. Efficacy of florpyrauxifen-benzyl for eurasian watermilfoil control and nontarget Illinois pondweed, elodea, and coontail response. Engineer Research and Development Center (U.S.), September 2021. http://dx.doi.org/10.21079/11681/42063.

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This research evaluated low concentrations and short exposure times of the recently registered aquatic herbicide florpyrauxifen-benzyl (4-amino-3-chloro-6-(4-chloro-2-fluoro-3-methoxyphenyl)-5-fluoro-pyridine-2-benzyl ester) on the target plant Eurasian watermilfoil (Myriophyllum spicatum L., hereafter referred to as EWM) as well as selectivity towards the nontarget submersed species Illinois pondweed (Potamogeton illinoensis Morong), elodea (Elodea canadensis Michx.), and coontail (Ceratophyllum demersum L.)

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Epstein, A. J., Y. Z. Wang, S. W. Jessen, J. W. Blatchford, and D. D. Gebler. Pyridine-Based Conjugated Polymers: Photophysical Properties and Light- Emitting Diodes. Fort Belvoir, VA: Defense Technical Information Center, September 1997. http://dx.doi.org/10.21236/ada330192.

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