Relevant bibliographies by topics / 2-a]pyrazine

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  2. Dissertations / Theses
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Academic literature on the topic '2-a]pyrazine'

Author: Grafiati
Published: 4 June 2021
Last updated: 25 July 2025

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Journal articles on the topic "2-a]pyrazine"

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Alfonso, Montserrat, and Helen Stoeckli-Evans. "Dimethyl and diethyl esters of 5,6-bis(pyridin-2-yl)pyrazine-2,3-dicarboxylic acid: a comparison." Acta Crystallographica Section E Crystallographic Communications 72, no. 2 (2016): 233–37. http://dx.doi.org/10.1107/s2056989016001080.

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In dimethyl 5,6-bis(pyridin-2-yl)pyrazine-2,3-dicarboxylate, C18H14N4O4, (I), and diethyl 5,6-bis(pyridin-2-yl)pyrazine-2,3-dicarboxylate, C20H18N4O4, (II), the dimethyl and diethyl esters of 5,6-bis(pyridin-2-yl)pyrazine-2,3-dicarboxylic acid, the orientation of the two pyridine rings differ. In (I), pyridine ringBis inclined to pyrazine ringAby 44.8 (2)° and the pyridine and pyrazine N atoms aretransto one another, while pyridine ringCis inclined to the pyrazine ring by 50.3 (2)°, with the pyridine and pyrazine N atomscisto one another. In compound (II), the diethyl ester, which possesses tw
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El-Wahab, Abd, A. H. Bedair, F. A. Eid, A. F. El-Haddad, Adawy El-Deeb, and G. M. El-Sherbiny. "Pyrazine-2-substituted carboxamide derivatives: synthesis, antimicrobial and leuconostoc mesenteroides growth inhibition activity." Journal of the Serbian Chemical Society 71, no. 5 (2006): 471–81. http://dx.doi.org/10.2298/jsc0605471e.

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Condensation of pyrazine-2,3-dicarboxylic acid anhydride with aminoacetophenones gave the corresponding N-(acetylphenyl)pyrazine-2-carboxamide. Their reactions with some electrophilic (carbonyl group, bromine) and nucleophilic (malononitrile hydrazine) reagents are discussed. N-[3-(2,2-Dicyano-1-methylethenyl)phenyl]pyrazine- 2-carboxamide underwent Michael addition reaction with an activated double bond yielding 3-amino-5-aryl-3?-(pyrazine-2-carboxamido)biphenyl-2,4-dicarbonitrile derivatives and 2-imino-4-(3-(pyrazine-2-carboxamido)phenyl)-6-(4-methoxyphenyl)cyclohexa 3,5-diene-1,1,3-tricarb
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Pickardt, Joachim, and Benedikt Staub. "Metall(II)-Diazin Komplexe: Kristallstrukturen von Cd(pyrazin)Br2, Cd(pyrazin)I2, Cu(pyrazin)Cl2 und Cd(pyrimidin)(NO3)2·2H2O/ Metal(II) Diazine Complexes: Crystal Structures of Cd(pyrazine)Br2, Cd(pyrazine)I2, Cu(pyrazine)Cl2, and Cd(pyrimidine)(NO3)2·2H2O." Zeitschrift für Naturforschung B 52, no. 12 (1997): 1456–60. http://dx.doi.org/10.1515/znb-1997-1203.

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Abstract Single crystals of the compounds Cd(pyrazine)Br2, Cd(pyrazine)I2, Cu(pyrazine)Cl2 and Cd(pyrimidine)(NO3)2·2H2O were obtained by crystallisation from aqueous solutions of the metal salts and solutions of the respective diazine in an organic solvent.The structures of the pyrazine complexes consist of “supramolecular” networks of -M-pyrazine-M-and -M -(μ2-Hal)2-M-chains. The pyrimidine complex shows a three dimensional network due to -M-pyrimidine-M-chains connected via hydrogen bonds between H(H2O) and O(ONO2).
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Cati, Dilovan S., and Helen Stoeckli-Evans. "The silver(I) nitrate complex of the ligandN-(pyridin-2-ylmethyl)pyrazine-2-carboxamide: a metal–organic framework (MOF) structure." Acta Crystallographica Section E Crystallographic Communications 73, no. 4 (2017): 535–38. http://dx.doi.org/10.1107/s2056989017003930.

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The reaction of silver(I) nitrate with the mono-substituted pyrazine carboxamide ligand,N-(pyridin-2-ylmethyl)pyrazine-2-carboxamide (L), led to the formation of the title compound with a metal–organic framework (MOF) structure, [Ag(C11H10N4O)(NO3)]n, poly[μ-nitrato-[μ-N-(pyridin-2-ylmethyl-κN)pyrazine-2-carboxamide-κN4]silver(I)]. The silver(I) atom is coordinated by a pyrazine N atom, a pyridine N atom, and two O atoms of two symmetry-related nitrate anions. It has a fourfold N2O2coordination sphere, which can be described as distorted trigonal–pyramidal. The ligands are bridged by the silve
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Otieno, T., S. J. Rettig, R. C. Thompson та J. Trotter. "Synthesis, structure, and vibrational spectrum of poly-μ-pyrazine(pyrazine)(trifluoromethanesulfonato-O)copper(I)". Canadian Journal of Chemistry 67, № 11 (1989): 1964–69. http://dx.doi.org/10.1139/v89-306.

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Orange–brown crystals of composition Cu(pyz)2(CF3SO3) (pyz = pyrazine, 1,4-diazine) were obtained from methanol solutions containing Cu(CF3SO3)2 and pyrazine in approximate 1:2 mole ratio. Single crystal X-ray diffraction and infrared and Raman spectroscopy studies are reported. Crystals of the title compound are triclinic, a = 8.312(2), b = 10.903(3), c = 8.201(2) Å, α = 92.53(2), β = 113.77(2), γ = 91.40(2)°, Z = 2, space group [Formula: see text] The structure was solved by heavy atom methods and was refined by full-matrix least-squares to R = 0.035 and Rw = 0.044 for 2458 reflections with
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Jyothi, Boggavarapu, and Nannapaneni Madhavi. "Green Synthesis and Antimicrobial Activity of Some Novel N-Arylimidazo[1,2-a]pyrazine-2-Carboxamide Derivatives." Asian Journal of Chemistry 32, no. 1 (2019): 84–90. http://dx.doi.org/10.14233/ajchem.2020.22365.

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The article deals with the synthesis of some novel N-arylimidazo[1,2-a]pyrazine-2-carboxamides (7a-l) by condensation reaction of imidazo[1,2-a]pyrazine-2-carboxylic acid (5) with different aliphatic/aromatic amines (6a-l) by using 1-methylimidazole, Mukaiyama’s reagent and 2-chloro-1-methylpyridinium iodide under microwave irradiation conditions. A new series of compounds 7 have been prepared from 2-iodopyrazine (1). Compound 1 on purged with ammonia gas in the presence of Cu2O and K2CO3 furnishes pyrazin-2-amine (2), which is treated with ethyl 3-bromo-2-oxopropanoate (3) to produce ethyl im
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Hensen, Karl, and Jens Gaede. "Thermodynamische Interpretation der Schmelzdiagramme binärer Systeme aus Methylchlorsilanen und Pyridazin bzw. Pyrazin." Zeitschrift für Naturforschung A 42, no. 4 (1987): 341–51. http://dx.doi.org/10.1515/zna-1987-0402.

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By analyzing the cooling curves and the resulting melting point diagrams of the chloromethylsilane- pyridazine and pyrazine systems the existence of the incongruently melting addition compounds CH3SiCl3 • Pyridazine, (CH3)2SiCl2 • (Pyridazine)2, (CH3)3SiCl • (Pyridazine)2, CH3SiCl3 • (Pyrazine)2, (CH3)2SiCl2 • (Pyrazine)2 , (CH3)3SiCl • (Pyrazine)2 was proved. By electro-optical measurements of the turbidity point it was proved that the system (CH3)3SiCl- Pyridazine exhibits a miscibility gap which intersects the liquidus curve of the amine. Based on certain approximations it was possible to f
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Kučerová-Chlupáčová, Marta, Veronika Opletalová, Josef Jampílek, et al. "New Hydrophobicity Constants of Substituents in Pyrazine Rings Derived from RP-HPLC Study." Collection of Czechoslovak Chemical Communications 73, no. 1 (2008): 1–18. http://dx.doi.org/10.1135/cccc20080001.

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Pyrazine derivatives show a wide range of biological activities. 1-Pyrazin-2-ylethan-1-ones have served as food flavourants, and together with pyrazine-2-carbonitriles have been widely used as intermediates in the synthesis of various heterocyclic compounds. In our laboratory, substituted pyrazine-2-carbonitriles and 1-pyrazin-2-ylethan-1-ones have been used as intermediates for the preparation of potential antifungal and antimycobacterial drugs. Using established methods, a library of pyrazine derivatives was synthesized. Homolytic alkylation of commercially available pyrazine-2-carbonitrile
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Dutkiewicz, Grzegorz, Edward Dutkiewicz, and Maciej Kubicki. "Cocrystals of pyrazine and benzene polycarboxylic acids." Acta Crystallographica Section C Structural Chemistry 74, no. 11 (2018): 1420–26. http://dx.doi.org/10.1107/s2053229618013669.

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The crystal structures of four cocrystals of pyrazine with benzene polycarboxylic acids were determined, namely pyrazine–phthalic (benzene-1,2-dicarboxylic) acid (1/1), C4H4N2·C8H6O4 (1), pyrazine–hemimellitic (benzene-1,2,3-tricarboxylic) acid (1/1), C4H4N2·C9H6O6 (2), pyrazine–hemimellitic acid–water (1/2/2), C4H4N2·2C9H6O6·2H2O (2a), and pyrazine–pyromellitic (benzene-1,2,4,5-tetracarboxylic) acid (3/1), 3C4H4N2·C10H6O8 (3). In all cases, infinite chains of alternating acid and base molecules, bonded by O—H...N hydrogen bonds, are formed. However, the details of the supramolecular structure
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Shirvan, Sadif A., та Sara Haydari Dezfuli. "catena-Poly[[tetraaquacopper(II)]-μ-pyrazine-2-carboxamide-κ3N4:N1,O-[bis(sulfato-κO)copper(II)]-μ-pyrazine-2-carboxamide-κ3N1,O:N4]". Acta Crystallographica Section E Structure Reports Online 68, № 8 (2012): m1082—m1083. http://dx.doi.org/10.1107/s1600536812031844.

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In the crystal of the title polymeric compound, [Cu2(SO4)2(C5H5N3O)2(H2O)4]n, two independent CuIIatoms are located on individual inversion centers. One CuIIatom is coordinated by four water molecules and two pyrazine-2-carboxamide ligands in a distorted O4N2octahedral geometry; the other isN,O-chelated by two pyrazine-2-carboxamide ligands and further coordinated by two sulfate anions in a distorted O4N2octahedral geometry. The pyrazine-2-carboxamide ligands bridge the CuIIatoms to form a polymeric chain running along [110]. The crystal structure features N—H...O, O—H...O and weak C—H...O hyd
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Dissertations / Theses on the topic "2-a]pyrazine"

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Saraiva, de Araujo Neta Marlène. "Planification, synthèse et activité tripanocide et leishmanicide de nouveaux dérivés hybrides à partir de 2-isoxazoline aza-bicyclique et 5,6,7,8-tétrahydroimidazo[1,2-a]pyrazine." Thesis, Nantes, 2019. http://www.theses.fr/2019NANT1022.

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Neglected diseases reach millions of people around the world. Among these are Chagas disease and Leishmaniasis. Chagas disease is caused by a protozoan, the Trypanosoma cruzi and its main form of transmission is through the faeces of the insect commonly known as barber. Leishmaniasis can be caused by more than 20 types of parasites of the genus Leishmania and there are 3 types of the disease, Cutaneous Leishmaniasis, Cutaneous-Mucous or Tegumentary Leishmaniasis, and Visceral Leishmaniasis. For the treatment of these diseases numerous problems exist, such as the large amount of side effects, l
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Tembo, Norbert Olivier. "Synthèse et étude physicochimique des 4-amino-1, 2, 3, 4-tétrahydro-1-isoquinolones et 2-quinolones ; 4-aryl-2, 3-dihydropyrrolizines ; 4-aryl-1-oxo-1, 2, 3, 4-tétrahydro-pyrrolo [1, 2-a] pyrazines ; 4-aryl-2-imidazolidinones." Caen, 1990. http://www.theses.fr/1990CAEN4044.

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Lancelot, Jean-Charles. "Synthèse et étude physicochimique des pyrido (3,2-e) pyrrolo (1,2-a) pyrazines, pyrido (2,3-e) pyrrolo (1,2-a) pyrazines, pyrazino (2,3-e) pyrrolo (1,2-a) pyrazines, (pyrrolyl-1)-8 triazolo-1, 2, 4 (4,3-a) pyridines, 6H-pyrido (2,3-c) pyrrolo (1,2-e) triazépines-1,2,5, pyrido (2,3-h) pyrrolo (1,2-a) quinoxalines." Caen, 1989. http://www.theses.fr/1989CAEN4023.

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Krajčovič, Jozef. "Studium thiofenových oligo-kopolymerů: syntéza a optoelektronické vlastnosti." Doctoral thesis, Vysoké učení technické v Brně. Fakulta chemická, 2010. http://www.nusl.cz/ntk/nusl-233316.

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Thesis presents synthesis and study of thiophene monomers, oligomers and polymers. The new series of thieno[3,4-b]pyrazine copolymers based on 3-dodecylthiophene and pyrazine monomers were prepared by oxidative polymerization with FeCl3. The effective synthetic method for preparation of 3-alkylthiophenes and thiophene oligomers was developed by optimizing of Kumada cross-couplig. The mentioned method could be realized for multikilos scale with possibility of transfer to pilot plant production. The second part of thesis focuses on synthesis and study of new thiophene compounds, which consist of
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Paredes, De La Red Cristina. "Syntéza a antiinfekční hodnocení substituovaných N-(pyrazin-2-yl)benzensulfonamidů." Master's thesis, 2018. http://www.nusl.cz/ntk/nusl-380521.

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Charles University Faculty of Pharmacy in Hradec Králové Department of Pharmaceutical Chemistry and Pharmaceutical Analysis Author: Cristina Paredes de la Red Supervisor: prof. PharmDr. Martin Doležal, Ph.D. Title of diploma thesis: Synthesis and antiinfective evaluation of substituted N-(pyrazine-2- yl)benzenesulfonamide Tuberculosis (TB) is among the ten leading causes of death, especially in developing countries. Even though it is an old disease with established treatment regimen, there has been an increased resistance to anti-TB drugs 1 . The anti-tubercular pyrazinamide has caught the att
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Books on the topic "2-a]pyrazine"

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Hammer, Christophe L. Synthesis and studies towards DNA incorporation of the base pair PyDDA-PuAAD: Synthesis and studies towards the DNA incorporation of a carbocyclic 2'-O-methylated analogue to 6-amino-3-[(Beta)-D-ribofuranosyl]-5-methyl-pyrazine-2-one. Synthesis and DNA incorporation of 2'deoxy-5-aza-3, 7-denza-guanosine. 1997.

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Book chapters on the topic "2-a]pyrazine"

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Bruns, W., and W. Kaim. "A First Stable Organometallic Analogue [mer-(OC)3 (PiPr3)2W(μ-pyrazine)W(PiPr3)2(CO)3]+ of the Creutz-Taubeion. Similarities and Differences." In Mixed Valency Systems: Applications in Chemistry, Physics and Biology. Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3606-8_25.

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Singh, Sonia, Nitin Agrawal, and Isha Mishra. "Pharmacology and Phytochemistry of Coriander." In Ethnopharmacological Investigation of Indian Spices. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-7998-2524-1.ch014.

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Coriander, named as Coriandrum sativum Linn, belongs to the family Umbelliferae and is one of the most popular and well-known spices/condiments and herbal medicines. The essential oils and fatty oils are the two major active chemical constituents present in the plant. The other minor ingredients found to be present are monoterpenes hydrocarbons i-e limonene, γ-terpinene, α-pinene, p-cymene, borneol, citronellol, camphor, geraniol, and geraniol acetate and abd heterocyclic components such as pyrazine, pyridine, thiazole, furan and tetrahudrofuran derivatives, isocoumarins, coriandrin, dihydroco
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Singh, Sonia, Nitin Agrawal, and Isha Mishra. "Pharmacology and Phytochemistry of Coriander." In Research Anthology on Recent Advancements in Ethnopharmacology and Nutraceuticals. IGI Global, 2022. http://dx.doi.org/10.4018/978-1-6684-3546-5.ch037.

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Coriander, named as Coriandrum sativum Linn, belongs to the family Umbelliferae and is one of the most popular and well-known spices/condiments and herbal medicines. The essential oils and fatty oils are the two major active chemical constituents present in the plant. The other minor ingredients found to be present are monoterpenes hydrocarbons i-e limonene, γ-terpinene, α-pinene, p-cymene, borneol, citronellol, camphor, geraniol, and geraniol acetate and abd heterocyclic components such as pyrazine, pyridine, thiazole, furan and tetrahudrofuran derivatives, isocoumarins, coriandrin, dihydroco
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Reta, Reta, Salengke Salengke, Mursalim Mursalim, et al. "Aroma Profile of Arabica Coffee Based on Ohmic Fermentation." In Fermentation - Processes, Benefits and Risks. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.98638.

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Aromatic components contained in coffee are the important components. Several technologies can be used to improve the aroma quality of coffee, for example with ohmic technology. This study established a specialty coffee processing system focused on ohmic-based fermentation technology. The aim of this study was to identify the aroma compound in coffee that fermented by ohmic technology. The SPME method by gas chromatography-mass spectrometry is used in this study. The temperatures (30, 35, and 40°C) and fermentation time were set for this study (2, 6, 12, and 18 h). The results of the sensory t
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Taber, Douglass F. "The Shair Synthesis of Cephalostatin 1." In Organic Synthesis. Oxford University Press, 2013. http://dx.doi.org/10.1093/oso/9780199965724.003.0093.

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The cephalostatins and ritterazines, represented by cephalostatin 1 3, have the remarkable property of inducing apoptosis in apoptosis-resistant malignant cell lines. The total synthesis ( J. Am. Chem. Soc. 2010, 132, 275) of 3 by Matthew D. Shair of Harvard University required the practical preparation of the complex hexacyclic ketones 1 and 2. The preparation of 1 started with irradiation of commercial hecogenin acetate 4 to give the known aldehyde 5 . Reaction of 5 with N -phenyltriazolenedione 6 led to the ketal 7. Oxidative cleavage generated an aldehyde, which on reduction and allylation
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Conference papers on the topic "2-a]pyrazine"

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Franich, Andjela, Ivana Vasić, Snežana Rajković, et al. "CYTOTOXICITY OF CATIONIC DINUCLEAR PLATINUM(II) COMPLEXES IN AN EXPERIMENTAL MODEL OF MOUSE COLON CANCER." In 1st INTERNATIONAL Conference on Chemo and BioInformatics. Institute for Information Technologies, University of Kragujevac, 2021. http://dx.doi.org/10.46793/iccbi21.293f.

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The series of nine dinuclear platinum(II) complexes, [{Pt(L)Cl}2(μ-X)]2+ (where L is two NH3 or bidentantly coordinated diamine ligand – ethylenediamine, en; (±)-1,2-propylenediamine, 1,2-pn; isobutylenediamine, ibn; trans-(±)-1,2-diaminocyclohexane, dach; 1,3-propylenediamine, 1,3-pd; 2,2- dimethyl-1,3-propylenediamine, 2,2-diMe-1,3-pd; (±)-1,3-pentanediamine,1,3-pnd, and X is a bridging pyrazine (pz) or pyridazine (pydz) ligand) have been synthesized and characterized. The antitumor potential of these complexes against CT26 cells were determined by in vitro and in vivo assays. A murine model
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Petrović, Biljana. "TRANSITION METAL ION COMPLEXES AS POTENTIAL ANTITUMOR AGENTS." In 1st INTERNATIONAL Conference on Chemo and BioInformatics. Institute for Information Technologies, University of Kragujevac,, 2021. http://dx.doi.org/10.46793/iccbi21.009p.

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Discovery of the antitumor activity of platinum complex, cisplatin, cis-Pt(NH3)2Cl2, and later carboplatin and oxaliplatin, led to the intensive investigation of the potential antitumor activity of the huge number of platinum complexes. Furthermore, it is well-known that platinum complexes express toxicity, numerous side effects and resistance, so the scientists make a lot of efforts to synthetize, beside Pt(II) and Pt(IV), other non-platinum compounds with potential antitumor activity, such as Pd(II), Ru(II/III) and Au(III) complexes. The goal of this study is to summarize the results of the
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