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

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Published: 5 June 2025

Last updated: 1 August 2025

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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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11

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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12

Mørkved, Eva H., Nils K. Afseth, and Helge Kjøsen. "Zn(quinoline)2Cl2: an efficient reagent for synthesis of zinc azaphthalocyanines with thiomorpholine- or pyrazole substituents." Journal of Porphyrins and Phthalocyanines 10, no. 11 (2006): 1301–8. http://dx.doi.org/10.1142/s1088424606000673.

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The Zn ( quinoline )2 Cl 2 complex is found to be a convenient reagent for the direct synthesis of amino-substituted, zinc azaphthalocyanines. Octa(4-thiomorpholinyl)- and octa(1-pyrazolyl)- substituted zinc azaphthalocyanines were synthesized from pyrazines, 5,6-bis(4-thiomorpholinyl)pyrazine-2,3-dicarbonitrile and 5,6-bis(1-pyrazolyl)pyrazine-2,3-dicarbonitrile, respectively and dry Zn ( quinoline )2 Cl 2. Two zinc azaphthalocyanines, both mixtures of four constitutional isomers, were synthesized by the same method, from 6-(2-thienyl)-5-(4-thiomorpholinyl)pyrazine-2,3-dicarbonitrile and from

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13

Mokrov, Grigory V., Milada A. Yarkova, Tatiana A. Gudasheva, and Sergey B. Seredenin. "New highly active pyrrolo[1, 2-a]pyrazine TSPO ligand." Proceedings for Annual Meeting of The Japanese Pharmacological Society WCP2018 (2018): PO4–1–37. http://dx.doi.org/10.1254/jpssuppl.wcp2018.0_po4-1-37.

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14

Wang, Yi, and Helen Stoeckli-Evans. "The inner-salt zwitterion, the dihydrochloride dihydrate and the dimethyl sulfoxide disolvate of 3,6-bis(pyridin-2-yl)pyrazine-2,5-dicarboxylic acid." Acta Crystallographica Section C Crystal Structure Communications 68, no. 11 (2012): o431—o435. http://dx.doi.org/10.1107/s0108270112039534.

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In the inner-salt zwitterion of 3,6-bis(pyridin-2-yl)pyrazine-2,5-dicarboxylic acid, (I), namely 5-carboxy-3-(pyridin-1-ium-2-yl)-6-(pyridin-2-yl)pyrazine-2-carboxylate, [C16H10N4O4, (Ia)], the pyrazine ring has a twist–boat conformation. The opposing pyridine and pyridinium rings are almost perpendicular to one another, with a dihedral angle of 80.24 (18)°, and are inclined to the pyrazine mean plane by 36.83 (17) and 43.74 (17)°, respectively. The carboxy and carboxylate groups are inclined to the mean plane of the pyrazine ring by 43.60 (17) and 45.46 (17)°, respectively. In the crystal str

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15

Kotthireddy, Thirumal Reddy, Sreenivasulu Reddymasu, and Ramesh Raju Rudraraju. "Synthesis and biological evaluation of 1,2,4-oxadiazole linked imidazopyrazine derivatives as anticancer agents." Journal of Indian Chemical Society Vol. 96, Aug 2019 (2019): 1085–90. https://doi.org/10.5281/zenodo.5638401.

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Department of Chemistry, Acharya Nagarjuna University, Nagarjuna Nagar-522 510, Andhra Pradesh, India Department of Chemistry, University College of Engineering (Autonomous), Jawaharlal Nehru Technological University, Kakinada-533 003, Andhra Pradesh, India <em>E-mail:</em> reddymasu.msc@gmail.com <em>Manuscript received online 21 May 2019, revised 24 June 2019, accepted 25 June 2019</em> A series of new 1,2,4-oxadiazole linked imidazopyrazines (10a-j) were synthesized and evaluated for their cytotoxic activity against various human cancer cell lines, such as MCF-7 (breast), A-549 (lung), and

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16

Moreno, J. M., J. Suarez-Varela, E. Colacio, J. C. Avila-Rosón, M. A. Hidalgo, and D. Martin-Ramos. "A two-dimensional copper(I) polymer containing both molecular rod and anionic bridges: synthesis and crystal structure of (µ-chloro)-(µ-pyrazine)copper(I)." Canadian Journal of Chemistry 73, no. 10 (1995): 1591–95. http://dx.doi.org/10.1139/v95-197.

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The crystal structure of bright-red crystals of the bidimensional polynuclear diamagnetic (µ-chloro)(µ-pyrazine)copper(I) complex has been analyzed from X-ray diffraction data. The structure was solved by the heavy-atom method. Full-matrix least-squares refinement based on 673 reflections with F > 4σ(F) converged to a final R = 0.043 and Rw = 0.048. Crystals of this complex are monoclinic, space group P2/c, a = 3.814(1), b = 6.356(1) and c = 11.497(5) Å; β = 96.04(2)°, Z = 2. The structure consists of planes of copper(I) atoms linked by pyrazine and Cl− bridges, each Cu(I) being in a distor

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17

Tabatabaee, Masoumeh, Boris-Marko Kukovec, Saeed Amjad, and Masoud R. Shishebor. "Two Different Barium(II) 2D Coordination Polymers Constructed with Pyrazine-2,3-Dicarboxylate: Synthesis, Crystal Structures, and Thermal Decomposition to Barium(II) Carbonate Nanoparticles." Australian Journal of Chemistry 69, no. 11 (2016): 1261. http://dx.doi.org/10.1071/ch16091.

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Two novel barium(ii) 2D coordination polymers, {[Ba(µ-H2O)(H2O)2(µ-pyzdc)]}n (1) and {[Ba(H2O)2(µ-Hpyzdc)(Hpyzdc)]⋅2H2O}n (2) (pyzdcH2 = pyrazine-2,3-dicarboxylic acid), were prepared by reaction of barium(ii) chloride dihydrate and pyrazine-2,3-dicarboxylic acid under similar experimental conditions (slightly different pH values) and characterised by elemental analysis, IR spectroscopy, and thermogravimetric analysis/differential thermal analysis methods. Their crystal structures were determined by single-crystal X-ray structure analysis and it was revealed that the barium(ii) ion has a disto

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18

Tesouro Vallina, Ana, and Helen Stoeckli-Evans. "The crystal structures and Hirshfeld surface analyses of a cadmium(II) and a zinc(II) mononuclear complex of the new tetrakis-substituted pyrazine ligand N,N′,N′′,N′′′-[pyrazine-2,3,5,6-tetrayltetrakis(methylene)]tetrakis(N-methylaniline)." Acta Crystallographica Section E Crystallographic Communications 76, no. 3 (2020): 410–16. http://dx.doi.org/10.1107/s2056989020001644.

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The whole molecule of the cadmium(II) complex, diiodido{N,N′,N′′,N′′′-[pyrazine-2,3,5,6-tetrayltetrakis(methylene)]tetrakis(N-methylaniline)-κ3 N 2,N 1,N 6}cadmium(II), [CdI2(C36H40N6)], (I), of the ligand N,N′,N′′,N′′′-[pyrazine-2,3,5,6-tetrayltetrakis(methylene)]tetrakis(N-methylaniline) (L), is generated by a twofold rotation symmetry; the twofold axis bisects the cadmium atom and the nitrogen atoms of the pyrazine ring. The ligand coordinates in a mono-tridentate manner and the cadmium atom has a fivefold CdN3I2 coordination environment with a distorted shape. In the zinc(II) complex, dich

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Cheruzel, Lionel E., Mark S. Mashuta, and Robert M. Buchanan. "5,10-dihydroxy-5H,10H-diimidazo[1,2-a:1′,2′-d]pyrazine." Acta Crystallographica Section C Crystal Structure Communications 61, no. 6 (2005): o361—o362. http://dx.doi.org/10.1107/s0108270105010280.

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20

ONG, KOK TONG, ZHI-QIANG LIU, and MENG GUAN TAY. "Review on the Synthesis of Pyrazine and Its Derivatives." Borneo Journal of Resource Science and Technology 7, no. 2 (2017): 60–75. http://dx.doi.org/10.33736/bjrst.591.2017.

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Pyrazine is a kind of natural product which can be found in plants, animals, insects, marine organisms andmicroorganisms. The main function of pyrazine in living organisms is used as flavor of the raw foods. Pyrazine and its derivatives were also produced in industries mainly for fragrance, flavor and pharmaceutical applications. This review describes the historical development of pyrazine including the discovery and synthesis, to the recent synthetic approach of pyrazinium. In general, six synthetic approaches namely condensation reaction, ring closure, metal catalysis, green reaction, Mailla

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Aşkın, Gülçin Şefiye, Fatih Çelik, Nefise Dilek, Hacali Necefoğlu та Tuncer Hökelek. "Crystal structure ofcatena-poly[[aquabis(4-formylbenzoato)-κ2O1,O1′;κO1-zinc]-μ-pyrazine-κ2N:N′]". Acta Crystallographica Section E Crystallographic Communications 71, № 4 (2015): 402–5. http://dx.doi.org/10.1107/s2056989015005472.

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The asymmetric unit of the title polymeric compound, [Zn(C8H5O3)2(C4H4N2)(H2O)]n, contains two molecular units. Each unit comprises two 4-formylbenzoate (FB) anions, one pyrazine molecule and one coordinating water molecule; the FB anions act either as bidentate or as monodentate ligands. The O atoms of the bidentately coordinating FB anions are disordered over two positions, and they were refined with fixed occupancy ratios of 0.75:0.25 and 0.70:0.30, respectively. In the ordered monodentately coordinating FB anions, the carboxylate groups are twisted away from the attached benzene rings (Ban

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22

Bensegueni, Mohamed Abdellatif, Aouatef Cherouana, Slimane Dahaoui, and Issam Boudraa. "Diaquabis[5-(2-pyrazin-2-yl)tetrazolato]copper(II)–pyrazine-2-carbonitrile (1/2)." Acta Crystallographica Section E Structure Reports Online 70, no. 3 (2014): m80—m81. http://dx.doi.org/10.1107/s1600536814002293.

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The title compound, [Cu(C5H3N6)2(H2O)2]·2C5H3N3, is a 1:2 co-crystal between the mononuclear complex diaquabis[5-(pyrazin-2-yl)tetrazolato]copper(II) and the reagent pyrazine-2-carbonitrile which was used in the synthesis. The CuIIatom is located on an inversion centre and has a distorted octahedral [4 + 2]-coordination environment formed by four N atoms of two chelating bidentate 5-(pyrazin-2-yl)tetrazolate ligands at shorter distances and two water O atoms at longer distances. The CuIIcomplex molecules are held together by O—H...N hydrogen bonds and π–π stacking interactions [centroid–centro

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Pu, Dandan, Yige Shi, Ruixin Meng, et al. "Decoding the Different Aroma-Active Compounds in Soy Sauce for Cold Dishes via a Multiple Sensory Evaluation and Instrumental Analysis." Foods 12, no. 19 (2023): 3693. http://dx.doi.org/10.3390/foods12193693.

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Screening the suitability of soy sauce for specific cooking methods from various products is beneficial for the fine development of the soy sauce industry. Multiple sensory evaluation and gas chromatography-mass spectrometry/olfactometry (GC-MS/O) analysis were combined to decode the suitability of soy sauces for cold dishes and characterize their differential aroma-active compounds. Thirty-two kinds of soy sauce with 42 sensory descriptors were determined via a check-all-that-apply analysis, and werefurther classified into six categories via a cluster analysis. The sensory evaluation results

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TERENIN, V. I., E. L. RUCHKINA, I. F. LESHCHEVA, A. P. PLESHKOVA, and YU G. BUNDEL'. "ChemInform Abstract: Dipyrrolo(1,2-a;2′,1′-c)pyrazines. Part 3. Electrophilic Substitution in the Series of Dipyrrolo(1,2-a;2′,1′-c)pyrazine and 5,6- Dihydrodipyrrolo(1,2-a;2′,1′-c)pyrazine Derivatives." ChemInform 28, no. 27 (2010): no. http://dx.doi.org/10.1002/chin.199727168.

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Alea, Glenn V., Anna Carmina S. Abarquez, Maria Pia Anne B. Austria, Alan Christian S. Lim, Faith Marie G. Lagua, and Michael Dominic M. Ajero. "Synthesis of 2-Hydroxy-5-(1-(2-(pyrazine-2-carbonyl) hydrazono)hexyl) Benzoic Acid, A Pyrazinamide Analog of Salicylic Acid." KIMIKA 24, no. 2 (2013): 18–26. http://dx.doi.org/10.26534/kimika.v24i2.18-26.

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The occurrence of resistant strains of Mycobacterium tuberculosis has driven current research on combining current anti-tuberculosis drugs and other bioactive molecules to enhance their efficacy against susceptible and resistant strains of the bacteria. In this study, a salicylic acid derivative of pyrazinamide, 2-hydroxy-5-(1-(2-(pyrazine-2-carbonyl)hydrazono)hexyl) benzoic acid was synthesized and characterized. The compound was prepared by coupling a pyrazinamide moiety, one of the first line drugs used to treat tuberculosis and a salicylic acid derivative with a 6-carbon alkyl chain. The s

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Domżalska, Marta, Aleksandra M. Dąbrowska, Dawid Chojnowski, Mariusz Makowski, and Agnieszka Chylewska. "Sensors to the Diagnostic Assessment of Anticancer and Antimicrobial Therapies Effectiveness by Drugs a with Pyrazine Scaffold." Chemosensors 10, no. 1 (2022): 24. http://dx.doi.org/10.3390/chemosensors10010024.

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Treatment with pyrazine derivatives—antituberculosis pyrazinamide (PZA), anticancer bortezomib (BZM), and antifungal pyrazine-2-amidoxime (PAOX) and pyrazine-2-thiocarboxamide (PTCA)—is associated with side effects, as observed in the case of other therapeutic drugs. To prevent the side effects of pyrazine derivatives, researchers are working to develop a universal method that will detect these compounds in body fluids. There is a lack of literature data about voltammetric measurements with poly-L-amino acid-modified GCEs surfaces. The available reports describe the application of various modi

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Xia, Jun, Xiao-Lin Gong, and Xing Fan. "Two new cadmium(II) coordination polymers based on bis(1,2,4-triazol-1-yl)alkane ligands and pyrazine-2,3-dicarboxylic acid." Acta Crystallographica Section C Structural Chemistry 71, no. 10 (2015): 878–82. http://dx.doi.org/10.1107/s2053229615016496.

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Assemblies of pyrazine-2,3-dicarboxylic acid and CdIIin the presence of bis(1,2,4-triazol-1-yl)butane or bis(1,2,4-triazol-1-yl)ethane under ambient conditions yielded two new coordination polymers, namely poly[[tetraaqua[μ2-1,4-bis(1,2,4-triazol-1-yl)butane-κ2N4:N4′]bis(μ2-pyrazine-2,3-dicarboxylato-κ3N1,O2:O3)dicadmium(II)] dihydrate], {[Cd2(C6H2N2O4)2(C8H12N6)(H2O)4]·2H2O}n, (I), and poly[[diaqua[μ2-1,2-bis(1,2,4-triazol-1-yl)ethane-κ2N4:N4′]bis(μ3-pyrazine-2,3-dicarboxylato-κ4N1,O2:O3:O3′)dicadmium(II)] dihydrate], {[Cd2(C6H2N2O4)2(C6H8N6)(H2O)2]·2H2O}n, (II). Complex (I) displays an inter

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V., Nagalakshmamma P. V. Chalapathi M. Venkataswamy B. Suman K. Thyaga Raju and C. Nagaraju*. "IN SILICO DISCOVERY AND MOLECULAR DOCKING EVALUATION OF NOVEL 3-(TRI FLUORO METHYL) - 5,6,7,8 - TETRA HYDRO –[1,2,4]-TRIAZOLO (4,3-Α)- PYRAZINE (SITAGLIPTIN INTERMIDIATE DERIVATES) INHIBITORS ON E-COLI DNA GYRASE-A". Indo American Journal of Pharmaceutical Sciences 04, № 09 (2017): 3185–92. https://doi.org/10.5281/zenodo.932516.

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The aim of present investigation is to identify the new potential inhibitors for E. coli DNA Gyrase-A by using in silico and molecular docking. A series of Sitagliptin title compounds were designed and were docked within the “Quinolone Resistance Determining Region” (QRDR) of E. coli DNA Gyrase-A (EcGyr-A) chain (QRDR-A). The obtained docking scores of Sitagliptin intermediate derivatives were compared with score of reference ligand ciprofloxacin and norflaxacin, under identical experimental sets. The Sitagliptin intermediate derivatives (7-(2-Nitrophenylsulfonyl)-3-(trifluoromethyl)-5,6,7,8-

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Nfor, Emmanuel Ngwang, Andrew David Burrows, Bridget Ndoye Ndosiri, Luke Lawrence Keenan, and Offiong Efanga Offiong. "Synthesis, structure and hydrogen sorption properties of a pyrazine-bridged copper(I) nitrate metal-organic framework." European Journal of Chemistry 10, no. 3 (2019): 195–200. http://dx.doi.org/10.5155/eurjchem.10.3.195-200.1888.

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A new copper(I) pyrazine-bridged coordination polymer [Cu2(pyz)3(NO3)2]·2DMF] (pyz = pyrazine) (1) has been synthesized and characterized by FT-IR, TG/DTG, DSC and single crystal X-ray diffraction techniques. The X-ray crystallographic result reveals a two-dimensional network structure containing hexagonal pores. Thermal analysis of compound 1 reveals it is stable to 380 °C, and gas sorption studies showed that it adsorbs 1.04 wt% hydrogen at 1 atm and 77 K. Compound 1 crystallizes in a triclinic system, space group P-1 (no. 2), a = 7.9550(2) Å, b = 7.9810(2) Å, c = 11.0660(3) Å, α = 76.328(1)

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James, M. "The Structure and Magnetic Properties of the Two-Dimensional Di-Pyrazine Bridged Polymers M(pz)2Br2 (M = FeII, CoII, NiII)." Australian Journal of Chemistry 55, no. 3 (2002): 219. http://dx.doi.org/10.1071/ch01094.

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The polymeric compounds M(pyrazine)2Br2 [M = Fe (1), Co (2), and Ni (3)] have been synthesized by the addition of a solution of pyrazine in methanol to a methanolic solution of the anhydrous metal bromide. The crystal structures of (1)-(3) were determined using powder synchrotron and neutron diffraction data and were found to be isostructural. The structures consist of pseudo-octahedral units, doubly linked by pyrazine ligands to form two-dimensional sheets. Magnetic susceptibility data were recorded for each complex down to 5 K and reveal paramagnetic behaviour at high temperatures and antife

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Terenin, V. I., E. A. Sumtsova, S. Zh Vatsadze, and N. V. Zyk. "Phosphorylation of 2,8-dimethyl-5,6-dihydropyrrolo[1,2-a;2′,1′-c]pyrazine." Chemistry of Heterocyclic Compounds 35, no. 9 (1999): 1113–14. http://dx.doi.org/10.1007/bf02251810.

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Armaghan, Mahsa, Tobias Stürzer, and Christoph Janiak. "Coordination Polymers with a Pyrazine-2,5-diyldimethanol Linker: Supramolecular Networks through Hydrogen and Halogen Bonds." Crystals 13, no. 8 (2023): 1193. http://dx.doi.org/10.3390/cryst13081193.

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In this paper, the synthesis and crystal structure of pyrazine-2,5-diyldimethanol (pyzdmH2, C6H8N2O2), a new symmetric water-soluble N,O-chelating tetra-dentate organic ligand, is reported and an environmentally friendly method is used to synthesize coordination compounds in water under ambient conditions, from the reaction of pyzdmH2 with the halide salts of Cu(II), Zn(II), Hg(II) and Cd(II): {[Cu(pyzdmH2)0.5(µ-Br)(Br)(H2O)]·H2O}n 1, {[Zn2(pyzdmH2)(µ-Cl)(Cl)3(H2O)]·H2O}n 2, [Hg2(pyzdmH2)0.5(µ-Cl)2(Cl)2]n 3, {[Cd2(pyzdmH2)(µ-Cl)4]·H2O}n 4, and {[Cd2(pyzdmH2)(µ-Br)4]·H2O}n 5. Single-crystal X-r

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Grigsby, Warren A., Travis S. Morien, Colin L. Raston, Brian W. Skelton, and Allan H. White. "Coordination Complexes of Tin(IV) Chloride with Unidentate Nitrogen Bases." Australian Journal of Chemistry 57, no. 5 (2004): 507. http://dx.doi.org/10.1071/ch03207.

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A single crystal X-ray study shows the product of reaction between quinuclidine, ‘qn’, and tin(IV) chloride in toluene solution to be, unusually, a five-coordinate neutral complex [qnSnCl4]. Sn—N is 2.282(5) Å in an axial site of a trigonal bipyramidal array, trans to an Sn—Cl bond 2.367(2) with Sn—Cl (equatorial) 2.323(2)–2.333(2) Å. With 1,4-pyrazine, ‘pz’, as adumbrated by earlier spectroscopic work, a 1 : 2 (centro-symmetric) adduct, trans-[pz2SnCl4] is obtained (rather than a pyrazine bridged polymer) [Sn—N 2.246(1), Sn—Cl 2.3883(4), 2.3980(4) Å].

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Ashraf-Khorassani, Mehdi, William M. Coleman, Michael F. Dube та Larry T. Taylor. "Optimization of α-Hydroxyketone and Pyrazine Syntheses Employing Preliminary Reactions of Glucose and Buffer Solutions". Beiträge zur Tabakforschung International/Contributions to Tobacco Research 28, № 7 (2019): 329–39. http://dx.doi.org/10.2478/cttr-2019-0014.

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SummaryGlucose and selected phosphate buffers have been reacted employing systematic variations in reaction temperature and time (150–160 °C for 60–90 min) to optimize the yield of acetol. This mixture was reacted further with NH4OH, systematically varying reaction conditions and reagent ratios to optimize pyrazine yield. The highest yield of pyrazine was obtained when 1 g of glucose was reacted with 25 mL of buffer at 150–160 °C for 60 min, which in turn was reacted with 1 mL of concentrated aqueous NH4OH at 120–130 °C for 17–18 h. Higher temperatures and higher concentrations of glucose caus

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Gieck, C., and Y. Garcia. "[Co(bppz)2](ClO4)2·MeOH: a new 2,6-bis(pyrazol-1-yl)pyrazine complex." Acta Crystallographica Section A Foundations of Crystallography 62, a1 (2006): s277. http://dx.doi.org/10.1107/s0108767306094475.

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Sugaleshini, S., D. Gayathri, D. Velmurugan, K. Ravikumar, and A. R. Sureshbabu. "Acenapthene-2-spiro-5′-perhydrodipyrrolo[1,2-a;2′,1′-c]pyrazine-6′-spiro-2′′-acenapthene-1,1′′-dione." Acta Crystallographica Section E Structure Reports Online 62, no. 6 (2006): o2432—o2434. http://dx.doi.org/10.1107/s1600536806017661.

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37

Cati, Dilovan S., and Helen Stoeckli-Evans. "The crystal structures of three pyrazine-2,5-dicarboxamides: three-dimensional supramolecular structures." Acta Crystallographica Section E Crystallographic Communications 73, no. 5 (2017): 729–34. http://dx.doi.org/10.1107/s2056989017005898.

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The complete molecules of the title compounds,N2,N5-bis(pyridin-2-ylmethyl)pyrazine-2,5-dicarboxamide, C18H16N6O2(I), 3,6-dimethyl-N2,N5-bis(pyridin-2-ylmethyl)pyrazine-2,5-dicarboxamide, C20H20N6O2(II), andN2,N5-bis(pyridin-4-ylmethyl)pyrazine-2,5-dicarboxamide, C18H16N6O2(III), are generated by inversion symmetry, with the pyrazine rings being located about centres of inversion. Each molecule has an extended conformation with the pyridine rings inclined to the pyrazine ring by 89.17 (7)° in (I), 75.83 (8)° in (II) and by 82.71 (6)° in (III). In the crystal of (I), molecules are linked by N—H

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Yu, Tao, Yonglian Zhang, Angela D. Kerekes, et al. "Discovery of a highly potent orally bioavailable imidazo-[1, 2- a ]pyrazine Aurora inhibitor." Bioorganic & Medicinal Chemistry Letters 28, no. 8 (2018): 1397–403. http://dx.doi.org/10.1016/j.bmcl.2018.02.037.

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39

Pacifico, Jessica, and Helen Stoeckli-Evans. "A new tetrakis-substituted pyrazine carboxylic acid, 3,3′,3′′,3′′′-{[pyrazine-2,3,5,6-tetrayltetrakis(methylene)]tetrakis(sulfanediyl)}tetrapropionic acid: crystal structures of two triclinic polymorphs and of two potassium–organic frameworks." Acta Crystallographica Section E Crystallographic Communications 77, no. 5 (2021): 480–90. http://dx.doi.org/10.1107/s2056989021003479.

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Two polymorphs of the title tetrakis-substituted pyrazine carboxylic acid, 3,3′,3′′,3′′′-{[pyrazine-2,3,5,6-tetrayltetrakis(methylene))tetrakis(sulfanediyl]}tetrapropionic acid, C20H28N2O8S4, (H4L1), have been obtained, H4L1_A and H4L1_B. Each structure crystallized with half a molecule in the asymmetric unit of a triclinic P\overline{1} unit cell. The whole molecules are generated by inversion symmetry, with the pyrazine rings being located about inversion centers. The crystals of H4L1_B were of poor quality, but the X-ray diffraction analysis does show the change in conformation of the –CH2—

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Bolognese, Adele, Anna Esposito, Michele Manfra, et al. "An NMR Study of the Bortezomib Degradation under Clinical Use Conditions." Advances in Hematology 2009 (2009): 1–5. http://dx.doi.org/10.1155/2009/704928.

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The (R)-3-methyl-1-((S)-3-phenyl-2-(pyrazine-2-carboxamido)propanamido)butyl-boronic acid, bortezomib (BTZ), which binds the 20S proteasome subunit and causes a large inhibition of its activity, is a peptidomimetic boronic drug mainly used for the treatment of multiple myeloma. CommercialBTZ, stabilized as mannitol derivative, has been investigated under the common conditions of the clinical use because it is suspected to be easily degradable in the region of its boronic moiety. CommercialBTZsamples, reconstituted according to the reported commercial instructions and stored at , were analyzed

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Cati, Dilovan S., and Helen Stoeckli-Evans. "Crystal structures ofN-(pyridin-2-ylmethyl)pyrazine-2-carboxamide (monoclinic polymorph) andN-(pyridin-4-ylmethyl)pyrazine-2-carboxamide." Acta Crystallographica Section E Structure Reports Online 70, no. 7 (2014): 18–22. http://dx.doi.org/10.1107/s1600536814009519.

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The title compounds, C11H10N4O (HL1) and C11H10N4O (HL2), are pyridine 2-ylmethyl and 4-ylmethyl derivatives, respectively, of pyrazine-2-carboxamide. HL1 was measured at 153 K and crystallized in the monoclinic space groupP21/cwithZ= 4. There has been a report of the same structure measured at room temperature but assumed to crystallize in the triclinic space groupP-1 withZ= 4 [Sasanet al.(2008).Monatsh. Chem.139, 773–780]. In HL1, the pyridine ring is inclined to the pyrazine ring by 61.34 (6)°, while in HL2 this dihedral angle is 84.33 (12)°. In both molecules, there is a short N—H...N inte

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42

Zheng, He-Qi, Lin Zhang, Mengting Lu, et al. "Precise Design and Deliberate Tuning of Turn-On Fluorescence in Tetraphenylpyrazine-Based Metal−Organic Frameworks." Research 2022 (October 17, 2022): 1–11. http://dx.doi.org/10.34133/2022/9869510.

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The manipulation on turn-on fluorescence in solid state materials attracts increasing interests owing to their widespread applications. Herein we report how the nonradiative pathways of tetraphenylpyrazine (TPP) units in metal−organic frameworks (MOFs) systems could be hindered through a topological design approach. Two MOFs single crystals of different topology were constructed via the solvothermal reaction of a TPP-based 4,4′,4″,4‴-(pyrazine-2,3,5,6-tetrayl) tetrabenzoic acid (H4TCPP) ligand and metal cations, and their mechanisms of formation have been explored. Compared with the innate low

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O'Leary, Brian, Trevor R. Spalding, George Ferguson, and Christopher Glidewell. "Oligosiloxanediols as building blocks for supramolecular chemistry: hydrogen-bonded adducts with amines form supramolecular structures in zero, one and two dimensions." Acta Crystallographica Section B Structural Science 56, no. 2 (2000): 273–86. http://dx.doi.org/10.1107/s0108768199013051.

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The structure of 1,1,3,3,5,5-hexaphenyltrisiloxane-1,5-diol–pyrazine (4/1), (C36H32O4Si3)4·C4H4N2 (1), contains finite centrosymmetric aggregates; the diol units form dimers, by means of O—H...O hydrogen bonds, and pairs of such dimers are linked to the pyrazine by means of O—H...N hydrogen bonds. In 1,1,3,3,5,5-hexaphenyltrisiloxane-1,5-diol–pyridine (2/3), (C36H32O4Si3)2·(C5H5N)3 (2), the diol units are linked into centrosymmetric pairs by means of disordered O—H...O hydrogen bonds: two of the three pyridine molecules are linked to the diol dimer by means of ordered O—H...N hydrogen bonds, w

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44

Popek, Rafal, and Guy Crundwell. "Crystal structures of 2,3-bis(thiophen-2-yl)pyrido[2,3-b]pyrazine and 7-bromo-2,3-bis(thiophen-2-yl)pyrido[2,3-b]pyrazine." Acta Crystallographica Section E Crystallographic Communications 75, no. 1 (2019): 89–93. http://dx.doi.org/10.1107/s2056989018016882.

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The crystal structures of 2,3-bis(thiophen-2-yl)pyrido[2,3-b]pyrazine, C15H9N3S2 (1), and 7-bromo-2,3-bis(thiophen-2-yl)pyrido[2,3-b]pyrazine, C15H8BrN3S2 (2), are discussed. Both molecules crystallize in space group P21/c. In 1, the thienyl rings are inclined to the mean plane of the pyridopyrazine moiety by 6.16 (7) and 86.66 (8)°, where as in 2 the corresponding dihedral angles are 33.29 (11) and 19.84 (9)°. The pyridopyrazine moiety is relatively planar in 1 with the two rings being inclined to each other by 1.33 (7)°. In 2, however, the pyridopyrazine moiety is buckled with the correspond

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Terenin, V. I., E. A. Sumtsova, S. Zh Vatsadze, and N. V. Zyk. "ChemInform Abstract: Phosphorylation of 2,8-Dimethyl-5,6-dihydropyrrolo[1,2-a;2′,1′-c]pyrazine." ChemInform 31, no. 38 (2000): no. http://dx.doi.org/10.1002/chin.200038063.

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46

Manickavelu, Manimaran, Sanjenbam Pratibha, and Kannabiran Krishnan. "Molecular docking approach for anti-sinusitic activity of pyrrolo[1,2-a]pyrazine1,4-dionehexahydro-3-(phenylmethyl) – extracted from Streptomyces sp. VITPK9." Journal of Indian Chemical Society Vol. 92, Apr 2015 (2015): 570–72. https://doi.org/10.5281/zenodo.5596420.

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Biomolecules and Genetics Division, SBST, VIT University, Vellore-632 014, Tamilnadu, India <em>E-mail</em> : kkb@vit.ac.in Sinusitis is prevalent in children and causes upper respiratory tract inflammation. The aim of the present study was to study the interaction of pyrrolo[1,2-a]pyrazine-1,4-dione hexahydro-3-(phenylmethyl) – (PPDHP) extracted from Streptomyces sp.VITPK9 (ligand) with selected targets, chemokines involved in the pathogenesis of sinusitis. Three chemokines, Interleukin 1 (1T4Q), Interleukin 6 (1IL6) and Interleukin 8 (3IL8) were chosen as target proteins. Docking was d

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Wang, Yanling, Qiang Peng, Ping He, Zaifang Li, Ying Liang, and Benlin Li. "Theoretical Design Study on Photophysical Properties of Light-emitting Pyrido[3,4-b]pyrazine-based Oligomers." Australian Journal of Chemistry 65, no. 2 (2012): 169. http://dx.doi.org/10.1071/ch11427.

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The electronic structures, charge injection and transport, and absorption and emission properties of four series of dimethylpyrido[3,4-b]pyrazine-based oligomers (5-(5,5-dimethyl-5H-dibenzo[b,d]silol-3-yl)-2,3-dimethylpyrido[3,4-b]pyrazine)n (SPP)n, (5-(dibenzo[b,d]thiophen-3-yl)-2,3-dimethylpyrido[3,4-b]pyrazine)n (TPP)n, (5-(9,9-dimethyl-9H-fluoren-2-yl)-2,3-dimethylpyrido[3,4-b]pyrazine)n (FPP)n, (2-(2,3-dimethylpyrido[3,4-b]pyrazin-5-yl)-9-methyl-9H-carbazole)n (PPC)n were investigated by the density functional theory approach. The ground-state geometries of (SPP)n, (TPP)n, (FPP)n and (PPC

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48

Wang, Zhaodong. "Synthesis and Structure of the Copper Complex [CuL(4, 4′bipy)(H2O)2](H2O)(ClO4)." E3S Web of Conferences 213 (2020): 01024. http://dx.doi.org/10.1051/e3sconf/202021301024.

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The reaction of N-(pyridine-2-ylmethyl)pyrazine-2-carboxamide (HL), 4, 4′-bipyridine(4, 4′-bipy) and copper(II) perchlorate leads to the formation of a new copper complex, [CuL(4, 4′bipy)(H2O)2](H2O)(ClO4) (1), The X-ray crystal analysis reveals that it is a mononuclear complex. CCDC: 1487818, 1.

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Faghihi, Khalil, Mohammad Naderi-Ghomi, and Mohsen Hajibeygi. "Synthesis and properties of new polyamide-organoclay nanocomposites containing pyrazine moiety in the main chain." Science and Engineering of Composite Materials 19, no. 3 (2012): 215–20. http://dx.doi.org/10.1515/secm-2011-0105.

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AbstractA series of polyamide (PA)/montmorillonite nanocomposites containing pyrazine moiety in the main chain were synthesized by a convenient solution intercalation technique. PA 3 as a source of polymer matrix was synthesized by the direct polycondensation reaction of pyrazine-2,3-dicarboxylic acid 1 with 4,4′-diaminodiphenyl sulfone 2 in the presence of triphenyl phosphite, CaCl2, pyridine, and N-methyl-2-pyrrolidone. The resulting nanocomposite films were characterized by Fourier transform infrared spectra, X-ray diffraction, scanning electron microscopy, and thermogravimetric analysis (T

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A. Pagani, Giorgio, Anna Berlin, Stefano Martina, Giorgio Pagani, Gilberto Schiavon, and Gianni Zotti. "Synthesis of the Parent Systems of Dipyrrolo[1,2-a:2',1'-c]pyrazine and of Dipyrrolo[1,2-a:2',1'-c]quinoxaline." HETEROCYCLES 32, no. 1 (1991): 85. http://dx.doi.org/10.3987/com-90-5619.

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