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Relevant bibliographies by topics / 2-a]pyrazine-1

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Academic literature on the topic '2-a]pyrazine-1'

Author: Grafiati

Published: 5 June 2025

Last updated: 1 August 2025

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Journal articles on the topic "2-a]pyrazine-1"

1

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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2

Döring, Cindy, Julian F. D. Lueck, and Peter G. Jones. "Structures of the adducts urea:pyrazine (1:1), thiourea:pyrazine (2:1) and thiourea:piperazine (2:1)." Zeitschrift für Naturforschung B 72, no. 6 (2017): 441–45. http://dx.doi.org/10.1515/znb-2017-0045.

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AbstractThe adducts urea:pyrazine (1:1) (1), thiourea:pyrazine (2:1) (2), and thiourea:piperazine (2:1) (3) were prepared and their structures determined. Adduct 1 forms a layer structure, in which urea chains of graph set C(4)[${\rm{R}}_{\rm{2}}^{\rm{1}}$(6)] run parallel to the b axis and are crosslinked by N–H···N hydrogen bonding to the pyrazine residues. Adduct 2 is a variant of the well-known ${\rm{R}}_{\rm{2}}^{\rm{2}}$(8) ribbon substructure for urea/thiourea adducts, with the pyrazine molecules attached to the remaining thiourea NH groups via bifurcated hydrogen bonds (N–H···)2S; the

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3

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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4

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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5

Verschave, P., and G. Hoornaert. "Synthesis of Imidazo[1, 2-a]pyrazine Nucleoside Analogues." Nucleosides and Nucleotides 4, no. 1-2 (1985): 231–32. http://dx.doi.org/10.1080/07328318508077865.

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6

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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7

Gao, Shan, and Seik Weng Ng. "2-[(2-Hydroxybenzyl)amino]pyrazinium perchlorate–2-[(pyrazin-2-ylamino)methyl]phenol (1/1)." Acta Crystallographica Section E Structure Reports Online 68, no. 8 (2012): o2475. http://dx.doi.org/10.1107/s1600536812031558.

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In the crystal structure of the title co-crystal, C11H12N3O+·ClO4−·C11H11N3O, the perchlorate ion is disordered about a twofold rotation axis with the Cl atom located on the twofold rotation axis; the 2-[(2-hydroxybenzyl)amino]pyrazinium cation and the neutral 2-[(pyrazin-2-ylamino)methyl]phenol molecule are disordered about the rotation axis in a 1:1 ratio. These two are connected by a pyrazine–pyrazine N1—H...N4hydrogen bond. The cation, whose two aromatic rings are twisted along the –CH2—NH– bond by 76.8 (1)°, is a hydrogen-bond donor to the perchlorate ion through the N atom of this link.

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8

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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9

Haynes, John S., Steven J. Rettig, John R. Sams, Robert C. Thompson, and James Trotter. "Structure and magnetic exchange in poly-bis(pyrazine)bis(methanesulfonato-O)-copper(II). One-dimensional exchange in a two-dimensional polymer." Canadian Journal of Chemistry 65, no. 2 (1987): 420–26. http://dx.doi.org/10.1139/v87-071.

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Crystals of poly-bis(pyrazine)bis(methanesulfonato-O)copper(II) are orthorhombic, a = 8.199(1), b = 13.130(1), c = 6.913(1) Å, Z = 2, space group Pnnm. The structure was solved by conventional heavy atom methods and was refined by full-matrix least-squares procedures to R = 0.025 and Rw = 0.033 for 1226 reflections with I ≥ 3σ(I). The complex contains parallel sheets, each sheet consisting of a square array of copper(II) ions bridged by two types of bidentate pyrazine ligands. The CuN4O2 chromophore is tetragonally elongated; the equatorial plane contains two pyrazine nitrogen atoms (Cu—N(1) =

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10

Finisia, Yenni, Siti Mutrofin, and Yuniar Ponco Prananto. "Anion Effect and Ligand Preference in the Precipitation of Ni(II) Complex from Methanolic Solution: Case of Tartrate vs Pyrazine." Journal of Pure and Applied Chemistry Research 11, no. 2 (2022): 128–35. http://dx.doi.org/10.21776/ub.jpacr.2022.011.02.670.

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This research aims to incorporate pyrazine in the synthesis of Ni(II)-tartrate-pyrazine metal organic frameworks or Ni(II)-T-P MOF as candidate of porous material. Synthesis of the targeted MOF was conducted at room temperature in a methanolic solution by mixing Ni(II) solution, L-tartaric acid (T), and pyrazine (P) solutions sequentially in various molar ratios (Ni(II):T:P = 1:1:0; 1:0:2; 1:2:2; and 1:2:4) using two different Ni(II) salts (chloride and nitrate). Solid products were characterized by infrared spectroscopy, qualitative anion identification test, melting point test, and scanning

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Dissertations / Theses on the topic "2-a]pyrazine-1"

1

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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2

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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Book chapters on the topic "2-a]pyrazine-1"

1

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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2

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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3

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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