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Journal articles on the topic '3-b]pyrazine'

Author: Grafiati

Published: 24 April 2022

Last updated: 30 July 2025

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1

Lassagne, Frédéric, Timothy Langlais, Elsa Caytan, et al. "From Quinoxaline, Pyrido[2,3-b]pyrazine and Pyrido[3,4-b]pyrazine to Pyrazino-Fused Carbazoles and Carbolines." Molecules 23, no. 11 (2018): 2961. http://dx.doi.org/10.3390/molecules23112961.

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2,3-Diphenylated quinoxaline, pyrido[2,3-b]pyrazine and 8-bromopyrido[3,4-b]pyrazine were halogenated in deprotometalation-trapping reactions using mixed 2,2,6,6-tetramethyl piperidino-based lithium-zinc combinations in tetrahydrofuran. The 2,3-diphenylated 5-iodo- quinoxaline, 8-iodopyrido[2,3-b]pyrazine and 8-bromo-7-iodopyrido[3,4-b]pyrazine thus obtained were subjected to palladium-catalyzed couplings with arylboronic acids or anilines, and possible subsequent cyclizations to afford the corresponding pyrazino[2,3-a]carbazole, pyrazino[2′,3′:5,6] pyrido[4,3-b]indole and pyrazino[2′,3′:4,5]p

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2

Wang, Cui-ping, Jing-bo Yan, Hai-Jun Chi, Yan Dong, and Zhi-qiang Zhang. "3-(4-Methoxyphenyl)pyrido[2,3-b]pyrazine." Acta Crystallographica Section E Structure Reports Online 66, no. 10 (2010): o2650. http://dx.doi.org/10.1107/s1600536810037943.

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3

Fun, Hoong-Kun, Madhukar Hemamalini, Anita Hazra, and Shyamaprosad Goswami. "Methyl pyrido[2,3-b]pyrazine-3-carboxylate." Acta Crystallographica Section E Structure Reports Online 67, no. 11 (2011): o3120. http://dx.doi.org/10.1107/s1600536811044412.

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4

Buděšínský, Miloš, Antonín Trka, Karel Stránský, and Milan Streibl. "Heterocyclic nitrogen-containing compounds from the extract of the springtail Tetrodontophora bielanensis (WAGA)." Collection of Czechoslovak Chemical Communications 51, no. 4 (1986): 956–63. http://dx.doi.org/10.1135/cccc19860956.

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Two pyrido[2,3-b]pyrazines were isolated from the extract of the springtail Tetrodontophora bielanensis (WAGA). Their structure were determined by mass and NMR spectroscopy: 2,3-dimethoxypyrido[2,3-b]pyrazine (I) and 2-methoxy-3-isopropylpyrido[2,3-b]pyrazine (II).

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5

Berteina-Raboin, Sabine, Joana Campos, and Maria-João Queiroz. "Synthesis of New Annulated Pyrazinothienotriazolopyrimidinones and Triazolylthienopyrazines." Synthesis 50, no. 05 (2017): 1159–65. http://dx.doi.org/10.1055/s-0036-1589136.

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New pyrazino[2′,3′:4,5]thieno[2,3-e][1,2,3]triazolo[1,5-a]-pyrimidin-5(4H)-ones were synthesized in an efficient, fast, and mild one-pot procedure from methyl 7-azidothieno[2,3-b]pyrazine-6-carboxylate. From the latter, some triazolothieno[2,3-b]pyrazine-6-carboxylates were also obtained with total regioselectivity by [2+3] cycloaddition with alkynes without any metal catalyst.

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6

Sonawane, Amol D., Atsushi Shimozuma, Taro Udagawa, Masayuki Ninomiya, and Mamoru Koketsu. "Synthesis and photophysical properties of selenopheno[2,3-b]quinoxaline and selenopheno[2,3-b]pyrazine heteroacenes." Organic & Biomolecular Chemistry 18, no. 21 (2020): 4063–70. http://dx.doi.org/10.1039/d0ob00718h.

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Novel synthesis of 2-arylselenopheno[2,3-b]quinoxaline, 3-(aryl/alkylselanyl)-2-arylselenopheno[2,3-b]quinoxaline and 6-phenyl-7-(arylselanyl)selenopheno[2,3-b]pyrazine derivatives, from the corresponding 2,3-dichloroquinoxaline and 2,3-dichloropyrazine derivatives.

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7

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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8

Snyder, Christopher J., Lucille A. Wells, David E. Chavez, Gregory H. Imler, and Damon A. Parrish. "Polycyclic N-oxides: high performing, low sensitivity energetic materials." Chemical Communications 55, no. 17 (2019): 2461–64. http://dx.doi.org/10.1039/c8cc09653h.

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9

Koch, Pierre, Dieter Schollmeyer, and Stefan Laufer. "2-(4-Fluorophenyl)-3-(4-pyridyl)pyrido[2,3-b]pyrazine." Acta Crystallographica Section E Structure Reports Online 65, no. 10 (2009): o2512. http://dx.doi.org/10.1107/s1600536809037295.

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10

Koch, Pierre, Dieter Schollmeyer, and Stefan Laufer. "3-(4-Fluorophenyl)-2-(4-pyridyl)pyrido[2,3-b]pyrazine." Acta Crystallographica Section E Structure Reports Online 65, no. 10 (2009): o2546. http://dx.doi.org/10.1107/s1600536809037970.

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11

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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12

Duan, Binghui, Ning Liu, Bozhou Wang, Xianming Lu, and Hongchang Mo. "Comparative Theoretical Studies on a Series of Novel Energetic Salts Composed of 4,8-Dihydrodifurazano[3,4-b,e]pyrazine-based Anions and Ammonium-based Cations." Molecules 24, no. 18 (2019): 3213. http://dx.doi.org/10.3390/molecules24183213.

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4,8-Dihydrodifurazano[3,4-b,e]pyrazine (DFP) is one kind of parent compound for the synthesis of various promising difurazanopyrazine derivatives. In this paper, eleven series of energetic salts composed of 4,8-dihydrodifurazano[3,4-b,e]pyrazine-based anions and ammonium-based cations were designed. Their densities, heats of formation, energetic properties, impact sensitivity, and thermodynamics of formation were studied and compared based on density functional theory and volume-based thermodynamics method. Results show that ammonium and hydroxylammonium salts exhibit higher densities and more

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13

Sivakumar, Gangala, Mahalingavelar Paramasivam, Dyaga Bharath, and Vaidya Jayathirtha Rao. "Energy level tuning of ‘Z’-shaped small molecular non-fullerene electron acceptors based on a dipyrrolo[2,3-b:2′,3′-e]pyrazine-2,6(1H,5H)-dione acceptor unit for organic photovoltaic applications: a joint experimental and DFT investigation on the effect of fluorination." New Journal of Chemistry 43, no. 13 (2019): 5173–86. http://dx.doi.org/10.1039/c8nj05645e.

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14

Assoumatine, Tokouré, and Helen Stoeckli-Evans. "Silver(I) nitrate two-dimensional coordination polymers of two new pyrazinethiophane ligands: 5,7-dihydro-1H,3H-dithieno[3,4-b:3′,4′-e]pyrazine and 3,4,8,10,11,13-hexahydro-1H,6H-bis([1,4]dithiocino)[6,7-b:6′,7′-e]pyrazine." Acta Crystallographica Section E Crystallographic Communications 76, no. 4 (2020): 539–46. http://dx.doi.org/10.1107/s205698902000362x.

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The two new pyrazineophanes, 5,7-dihydro-1H,3H-dithieno[3,4-b:3′,4′-e]pyrazine, C8H8N2S2, L1, and 3,4,8,10,11,13-hexahydro-1H,6H-bis([1,4]dithiocino)[6,7-b:6′,7′-e]pyrazine, C12H16N2S4, L2, both crystallize with half a molecule in the asymmetric unit; the whole molecules are generated by inversion symmetry. The molecule of L1, which is planar (r.m.s. deviation = 0.008 Å), consists of two sulfur atoms linked by a rigid tetra-2,3,5,6-methylenepyrazine unit, forming planar five-membered rings. The molecule of L2 is step-shaped and consists of two S–CH2–CH2–S chains linked by the central rigid tet

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15

MIYAZAWA, Tomoyuki, Tohru TAKABATAKE, and Minoru HASEGAWA. "Synthesis and Antibacterial Properties of Pyrido[2, 3-b]pyrazine Derivatives." YAKUGAKU ZASSHI 117, no. 2 (1997): 126–32. http://dx.doi.org/10.1248/yakushi1947.117.2_126.

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16

Starchenkov, I. B., and V. G. Andrianov. "4H,8H-bis(1,2,5-oxadiazolo)[3,4-b:3',4'-e]Pyrazine." Chemistry of Heterocyclic Compounds 32, no. 5 (1996): 618. http://dx.doi.org/10.1007/bf01164797.

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17

Sheremetev, Aleksei B., and Igor L. Yudin. "Synthesis of unsubstituted 4H,8H-bisfurazano[3,4-b:3′,4′-e]pyrazine." Mendeleev Communications 6, no. 6 (1996): 247–48. http://dx.doi.org/10.1070/mc1996v006n06abeh000746.

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18

Gulyas, PT, TW Hambley, and PA Lay. "The Crystal Structure of (2,2′-Bipyridine)(pyrazine)(2,2′:6′,2″-terpyridine)ruthenium(II) Hexafluorophosphate." Australian Journal of Chemistry 49, no. 4 (1996): 527. http://dx.doi.org/10.1071/ch9960527.

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The crystal structure of [ Ru ( terpy )( bpy )( pz )] (PF6)2 has been determined by X-ray diffraction methods and refined to a residual of 0.046 for 1855 independent observed reflections. The crystals are monoclinic, space group P 21/a, a 16.836(7), b 10.778(5), c l9.342(5) Ǻ, β 115.11(3)°. The coordination geometry around the ruthenium(II) ion is distorted octahedral, with the various Ru -N bond lengths indicative of considerable interligand steric strain. The Ru -N pyrazine bond is the longest within the structure, consistent with other evidence that n back-bonding to pyrazine is weak in the

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19

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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20

Prestont, P. N., V. K. Shaht, S. W. Simpsont, I. Soutar, and N. J. Stewart. "Studies on bismaleimides and related materials: Part III. Synthesis and characterization of bismaleimiides derived from benzophenone, 1, 2-diphenylethane, 1, 4-diphenylbutane and condensed pyrazines." High Performance Polymers 6, no. 1 (1994): 35–41. http://dx.doi.org/10.1088/0954-0083/6/1/004.

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New bismaleimides have been synthesised from diamines derived from benzophenone, 1,2-diphenylethane, 1,4-diphenylbutane, 2, 3-diphenylquinoxaline and 2, 3-diphenylnaphtho[2, 3-b]pyrazine. Cure profiles have been established by both differential scanning calorimetry (Dsc) and dynamic mechanical thermal analysis (DMTA). Cured resins prepared from the bismaleimide monomers were studied by thermal gravimetric analysis (TGA) with all materials exhibiting good thermal and thermo-oxidative stability.

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21

Bock, Hans, Holger Schödel, and Thorsten Vaupel. "Wechselwirkungen in Kristallen, 112 [1]. Tetra(2-pyridyl)pyrazin - ein vielseitiger Ligand für Lewis-Säuren: Halb- und doppelschalige Komplexe von Kupfer(II)- und Nickel(II)-Salzen / Interactions in Crystals, 112 [1]. Tetra(2-pyridyl)pyrazine - a Versatile Ligand for Lewis Acids: Semi- and Doubly-Encapsulated Complexes of Copper(II) and Nickel(II) Salts." Zeitschrift für Naturforschung B 52, no. 4 (1997): 515–23. http://dx.doi.org/10.1515/znb-1997-0413.

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Preceding cyclovoltammetric measurements of tetra(2-pyridyl)pyrazine (TPP) in aprotic THF solution and the lowering of the reduction potential on Li+[B(C6H5)4 ] addition, the crystallization of diprotonated [TPPH2++][B(CAH5)4-]2 and of [2,4,6-tris(2-pyridyl)-1,3,5- triazine(Li+)][B(C6H5)4-] have stimulated the preparation and structural characterization of the following (TPP)1,2 copper(II) and (TPP)2 nickel(II) salts: (1) Green TTP-copper(II)- dichlorideacetonitrile with Cu2+ fivefold coordinated by three N contacts to one TPP ligand and by two Cl anions, (2) green di(TPP)-copper(II)-di(perchl

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22

Kanno, Manabu, Yuta Ito, Noriyuki Shimakura, Shiro Koseki, Hirohiko Kono, and Yuichi Fujimura. "Ab initio quantum dynamical analysis of ultrafast nonradiative transitions via conical intersections in pyrazine." Physical Chemistry Chemical Physics 17, no. 3 (2015): 2012–14. http://dx.doi.org/10.1039/c4cp04807e.

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Ab initio quantum dynamical calculations reveal the contributions of the optically dark S<sub>1</sub> (<sup>1</sup>B<sub>3u</sub>), S<sub>3</sub> (<sup>1</sup>A<sub>u</sub>), and S<sub>4</sub> (<sup>1</sup>B<sub>2g</sub>) states to ultrafast nonradiative transition from the optically bright S<sub>2</sub> (<sup>1</sup>B<sub>2u</sub>) state in pyrazine and suggest a much faster transition rate than previously believed.

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23

Sui, Liqiang, Sugui Wang, Xin Wang, et al. "Analysis of Different Strains Fermented Douchi by GC×GC-TOFMS and UPLC–Q-TOFMS Omics Analysis." Foods 13, no. 21 (2024): 3521. http://dx.doi.org/10.3390/foods13213521.

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Douchi is a kind of soybean-fermented food in China. To explore the common and differential compounds in different Douchi, Douchi was fermented by Aspergillus niger, Rhizopus arrhizus, and Bacillus circulans, respectively, and co-fermented by the three strains in this study. The common and characteristic flavor compounds and common and characteristic non-volatile components of different strains of fermented Douchi were explored through GC×GC-TOFMS and UPLC–Q-TOFMS omics analysis. The result suggested that Pyrazines, ketones, and alkenes such as tetramethyl-pyrazine, 2,5-dimethyl pyrazine, fura

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24

Otieno, Tom, Steven J. Rettig, Robert C. Thompson та James Trotter. "Pyrazine and 2,5-dimethylpyrazine complexes of copper(I) trifluoromethanesulfonate. The crystal and molecular structure of poly-μ-2,5-dimethylpyrazine-(2,5-dimethylpyrazine)-(trifluoromethanesulfonato-O)copper(I)". Canadian Journal of Chemistry 68, № 10 (1990): 1901–7. http://dx.doi.org/10.1139/v90-294.

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The complexes CuL2(CF3SO3) where L is pyrazine and 2,5-dimethylpyrazine have been prepared by the reaction of copper(I) triflate with the neutral ligand in methanol. Single crystal X-ray diffraction studies on the 2,5-Me2pyz complex are reported. Crystals of the compound are triclinic, a = 9.424(4), b = 12.103(4), c = 9.113(4) Å, α = 110.97(3), β = 117.20(3), γ = 80.26(3)°, Z = 2, space group [Formula: see text]. The structure was solved by heavy atom methods and was refined by full-matrix least-squares procedures to R = 0.033 and Rw = 0.039 for 3326 reflections with I ≥ 3σ(1). The structure i

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25

STARCHENKOV, I. B., and V. G. ANDRIANOV. "ChemInform Abstract: 4H,8H-Bis(1,2,5-oxadiazolo)(3,4-b:3′,4′-e)pyrazine." ChemInform 27, no. 45 (2010): no. http://dx.doi.org/10.1002/chin.199645186.

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26

Fetzer, Th, A. Lentz, and T. Debaerdemaeker. "Einkristallzüchtung und Röntgenstrukturanalyse polymerer 1:1-Komplexe von CuBr2 und CuCl2 mit Pyrazin aus Gelen / Crystal Growth in Gels and X-Ray Characterization of Polymeric 1:1-Complexes of CuBr2 and CuCl2 with Pyrazine." Zeitschrift für Naturforschung B 44, no. 5 (1989): 553–56. http://dx.doi.org/10.1515/znb-1989-0509.

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Single crystals of Cu(pz)Br2 and Cu(pz)Cl2 were grown by using gel methods with tetramethoxysilane as the gel-forming reagent. Thermal decomposition is interpreted. Crystal data for the bromo complex: monoclinic, space group C2/m with a = 1239.2(3) pm, b = 685.9(2) pm, c = 390.7(3) pm, β = 96,23(5)°. Crystal data for the chloro-complex: monoclinic, space group C2/m with a = 1197.1(3) pm, b = 684.9(3) pm, c = 370.1(3) pm, β = 95.96(5)°. Crystal structure analyses reveal that CuHal2 molecules are bonded by pyrazine to form linear chains. These chains are cross-linked by bridging halogen atoms.

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27

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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28

Kim, Nayeon, Se Hun Kwak, Seon-Hyeong Lee, et al. "Novel 3-arylethynyl-substituted thieno[3,4-b]pyrazine derivatives as human transglutaminase 2 inhibitors." Organic & Biomolecular Chemistry 12, no. 27 (2014): 4932. http://dx.doi.org/10.1039/c4ob00179f.

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29

Zhang, Weijiang, Anthony R. Haight, Kelley L. Ford, and Shyamal I. Parekh. "A REGIOSELECTIVE SYNTHESIS OF METHYL 7-AMINO-3-PHENYLTHIENO-[2,3-b]PYRAZINE-6-CARBOXYLATE." Synthetic Communications 31, no. 5 (2001): 725–30. http://dx.doi.org/10.1081/scc-100103262.

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30

SHEREMETEV, A. B., and I. L. YUDIN. "ChemInform Abstract: Synthesis of Unsubstituted 4H,8H-Bisfurazano(3,4-b:3′,4′-e)pyrazine." ChemInform 28, no. 15 (2010): no. http://dx.doi.org/10.1002/chin.199715166.

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31

Köferstein, Roberto. "The Layered Structure of Cu2(H2O)4[C4H4N2][C6H2(COO)4]·2H2O." Z. Anorg. Allg. Chem. 631 (March 23, 2005): 1756−1758. https://doi.org/10.1002/zaac.200500141.

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Triclinic single crystals of Cu2(H2O)4[C4H4N2][C6H2(COO)4]·2H2O have been grown in an aqueous silica gel. Space group (Nr. 2), a = 723.94(7) pm, b = 813.38(14) pm, c = 931.0(2) pm, α = 74.24(2)°, β = 79.24(2)°, γ = 65.451(10)°, V = 0.47819(14) nm3, Z = 1. Cu2+ is coordinated in a distorted, octahedral manner by two water molecules, three oxygen atoms of the pyromellitate anions and one nitrogen atom of pyrazine (Cu—O 194.1(2)–229.3(3) pm; Cu–N 202.0(2) pm). The connection of Cu2+ and [C6H2(COO)4)]4− yields infinite strands, which are

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32

Sumby, Christopher J. "Ruthenium(II) Complexes of New Chelating Indolizino[2,3-b]pyrazine- and Indolizino[2,3-b]quinoxaline-Derived Ligands: Syntheses, Electrochemistry and Absorption Spectroscopy." Australian Journal of Chemistry 61, no. 11 (2008): 894. http://dx.doi.org/10.1071/ch08339.

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The highly conjugated chelating ligands 5-(2-pyridyl)indolizino[2,3-b]pyrazine 1, 5-(2-pyridyl)indolizino[2,3-b]quinoxaline 2, and 8,9-dimethyl-5-(2-pyridyl)indolizino[2,3-b]quinoxaline 3 were prepared in one step, with good yields, from di-2-pyridylmethane and 2,3-dichloropyrazine, 2,3-dichloroquinoxaline, and 8,9-dimethyl-2,3-dichloroquinoxaline, respectively. Compounds 1–3 display long-wavelength absorption maxima in the green (1) and yellow (2 and 3) to give intensely coloured red and purple solutions, respectively. Bis(2,2′-bipyridyl)ruthenium(ii) and bis(4,4′-dimethyl-2,2′-bipyridyl)ruth

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33

Yanborisov, T. N., S. N. Shurov, Yu S. Andreichikov, V. G. Baklykov, and V. L. Savel'ev. "Synthesis of 3-(1-adamantyl)amino-1,2-dihyro-5-chromeno[4,3-b]pyrazine-2,5-dione." Chemistry of Heterocyclic Compounds 26, no. 12 (1990): 1409. http://dx.doi.org/10.1007/bf00473977.

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34

Zhang, Weijiang, Anthony R. Haight, Kelley L. Ford, and Shyamal I. Parekh. "ChemInform Abstract: Regioselective Synthesis of Methyl 7- Amino-3-phenylthieno[2,3-b]pyrazine-6-carboxylate." ChemInform 32, no. 35 (2010): no. http://dx.doi.org/10.1002/chin.200135164.

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35

Jaung, Jae-Yun, Koushi Fukunishi, and Masaru Matsuoka. "Syntheses and spectral properties of 2,3,7,8-tetracyano-5,10-dihydrodipyrazino[2,3-b:2′,3′-e]pyrazine." Journal of Heterocyclic Chemistry 34, no. 2 (1997): 653–57. http://dx.doi.org/10.1002/jhet.5570340251.

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Enakieva, Yuliya Yu, Yuliya G. Gorbunova, Aslan Yu Tsivadze, Christine Stern, and Roger Guilard. "Ruthenium(II) meso-tetra-(benzo-15-crown-5)-porphyrinates: synthesis and spectroscopic investigation." Journal of Porphyrins and Phthalocyanines 11, no. 12 (2007): 883–90. http://dx.doi.org/10.1142/s1088424607001004.

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The synthesis of novel ruthenium(II) meso-tetra-(benzo-15-crown-5)-porphyrinates, meso-[( B 15 C 5)4 Por ] Ru ( CO )( MeOH ) (1) and meso-[( B 15 C 5)4 Por ] Ru ( L )2 (2)-(4) (meso-[( B 15 C 5)4 Por ]2-= 5,10,15,20-tetrakis-(benzo-15-crown-5)-porphyrinato-dianion; L = pyridine (py), pyrazine (pyz), 4,4′-bipyridyl (4,4′-bpy)), where CO and MeOH , or two N -donor ligands are axially coordinated to the central metal, are reported. The metalation of the free ligand performed by the reaction of Ru 3( CO )12 with meso-[( B 15 C 5)4 Por ] H 2 in 1,2,4-trichlorobenzene (TCB, bp = 215°C), gives (1) in

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Battistini, Maurizio, Emanuela Erba, and Donato Pocar. "v-Triazolines; 33.1Synthesis of 3-Aminoquinoxaline 1-Oxides and 2-Aminopyrido[3,4-b]-pyrazine 4-Oxides." Synthesis 1992, no. 12 (1992): 1206–8. http://dx.doi.org/10.1055/s-1992-26335.

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TSELINSKII, I. V., S. F. MEL'NIKOVA, T. V. ROMANOVA, et al. "ChemInform Abstract: 4H,8H-Bis-(1,2,5-oxadiazolo)[3,4-b:3′,4′-e]pyrazine and Some Derivatives." ChemInform 29, no. 34 (2010): no. http://dx.doi.org/10.1002/chin.199834178.

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Mukherjee, Prasun, Asish Das, Raghwendra Mishra, Shovonlal Bhowmick, and Achintya Saha. "Synthesis of Novel tricyclic pyrazolo(1,4)oxathiinopyrazines and Evaluation of Their Competency Towards the Inhibition of Lactate Dehydrogenase Activity-Inhibition of LDH Activity." Drug Research 68, no. 11 (2018): 653–60. http://dx.doi.org/10.1055/a-0630-4988.

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AbstractWe have evaluated the LDH inhibitory property of novel pyrazolo[4′,3′:5,6][1,4]oxathiino[2,3-b]pyrazine derivatives which have been synthesized from easily available starting materials through a one-pot protocol that offers the use of elemental sulfur as the sulfur source. These newly synthesized compounds may aid to drug development for neoplastic and non-neoplastic diseases characterized by increased glucose metabolism. Additionally, they may act as suitable starting materials which can be further structurally modified for the development of new LDH inhibitors with higher efficacy an

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Ha, Kwang. "(2,3-Di-2-pyridylpyrazine-κ2 N 2,N 3)diiodidoplatinum(II)". Acta Crystallographica Section E Structure Reports Online 68, № 6 (2012): m834. http://dx.doi.org/10.1107/s1600536812023501.

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The PtII ion in the title complex, [PtI2(C14H10N4)], exists in a distorted square-planar environment defined by the two pyridine N atoms of the chelating 2,3-di-2-pyridylpyrazine ligand and two iodide anions. The pyridine rings are inclined to the least-squares plane of the PtI2N2 unit [maximum deviation = 0.070 (3) Å] at 66.1 (2) and 65.9 (2)°; the pyrazine ring is perpendicular to this plane [dihedral angle = 89.7 (2)°]. Two intermolecular C—H...I hydrogen bonds, both involving the same I atom as hydrogen-bond acceptor, generate a layer structure extending parallel to (001). Molecules are st

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Willot, Pieter, David Moerman, Philippe Leclère, et al. "One-Pot Synthesis and Characterization of All-Conjugated Poly(3-alkylthiophene)-block-poly(dialkylthieno[3,4-b]pyrazine)." Macromolecules 47, no. 19 (2014): 6671–78. http://dx.doi.org/10.1021/ma501757e.

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Čı́k, G., F. Šeršeň, L. Dlháň, I. Červeň, A. Staško, and D. Végh. "Study of magnetic properties of copolymer of 3-dodecylthiophene and 2,3-R,R-thieno[3,4-b]pyrazine." Synthetic Metals 130, no. 2 (2002): 213–20. http://dx.doi.org/10.1016/s0379-6779(02)00113-3.

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YANBORISOV, T. N., S. N. SHUROV, YU S. ANDREICHIKOV, V. G. BAKLYKOV, and V. L. SAVEL'EV. "ChemInform Abstract: Synthesis of 3-(1-Adamantyl)amino-1,2-dihydro-5H-chromeno(4,3-b) pyrazine-2,5-dione." ChemInform 23, no. 40 (2010): no. http://dx.doi.org/10.1002/chin.199240198.

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JAUNG, J., K. FUKUNISHI, and M. MATSUOKA. "ChemInform Abstract: Syntheses and Spectral Properties of 2,3,7,8-Tetracyano-5,10- dihydrodipyrazino(2,3-b:2′,3′-e)pyrazine." ChemInform 28, no. 41 (2010): no. http://dx.doi.org/10.1002/chin.199741195.

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DALINGER, I. L., N. I. ZUBANOVA, V. S. KUZ'MIN, and S. A. SHEVELEV. "ChemInform Abstract: Nitropyrazoles. Part 2. Nitro Derivatives of Dipyrazolo(3,4-b:4′,3′-e) pyrazine (V), (VI)." ChemInform 25, no. 31 (2010): no. http://dx.doi.org/10.1002/chin.199431176.

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Li, Wei, Junjun Tian, Xiujuan Qi, et al. "Synthesis of 4,8-Dinitraminodifurazano[3, 4-b,e ]pyrazine Derived Nitrogen-Rich Salts as Potential Energetic Materials." ChemistrySelect 3, no. 2 (2018): 849–54. http://dx.doi.org/10.1002/slct.201702678.

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Deorukhkar, Neel, Timothée Lathion, Laure Guénée, Céline Besnard, and Claude Piguet. "The Tyranny of Arm-Wrestling Methyls on Iron(II) Spin State in Pseudo-Octahedral [Fe(didentate)3] Complexes." Chemistry 2, no. 2 (2020): 231–52. http://dx.doi.org/10.3390/chemistry2020015.

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The connection of a sterically constrained 3-methyl-pyrazine ring to a N-methyl-benzimidazole unit to give the unsymmetrical α,α’-diimine ligand L5 has been programmed for the design of pseudo-octahedral spin-crossover [Fe(L5)3]2+ units, the transition temperature (T1/2) of which occurs in between those reported for related facial tris-didentate iron chromophores fitted with 3-methyl-pyridine-benzimidazole in a LaFe helicate (T1/2 ~ 50 K) and with 5-methyl-pyrazine-benzimidazole L2 ligands (T1/2 ~350 K). A thorough crystallographic analysis of [Fe(L5)3](ClO4)2 (I), [Ni(L5)3](ClO4)2 (II), [Ni(L

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Li, Wenzhe, Yiting Fu, Yanqing Jiang, et al. "Synergistic Biocontrol and Growth Promotion in Strawberries by Co-Cultured Trichoderma harzianum TW21990 and Burkholderia vietnamiensis B418." Journal of Fungi 10, no. 8 (2024): 551. http://dx.doi.org/10.3390/jof10080551.

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This study aimed to investigate the efficiency of the secondary metabolites (SMs) produced by a co-culture of Trichoderma harzianum TW21990 and Burkholderia vietnamiensis B418 in the control of Colletotrichum siamense CM9. A fermentation filtrate of B418 + TW21990 co-culture (BT21) produced a notable increase in the inhibition rate of CM9 compared to those of TW21990 and B418 monocultures, which reached 91.40% and 80.46% on PDA plates and strawberry leaves, respectively. The BT21 fermentation broth exhibited high control efficiency on strawberry root rot of 68.95% in a pot experiment, which wa

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Chung, Cheng-Yen, Ching-Chun Tseng, Sin-Min Li, Shuo-En Tsai, Hui-Yi Lin, and Fung Fuh Wong. "Structural Identification between Phthalazine-1,4-Diones and N-Aminophthalimides via Vilsmeier Reaction: Nitrogen Cyclization and Tautomerization Study." Molecules 26, no. 10 (2021): 2907. http://dx.doi.org/10.3390/molecules26102907.

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N-Aminophthalimides and phthalazine 1,4-diones were synthesized from isobenzofuran-1,3-dione, isoindoline-1,3-dione, furo [3,4-b] pyrazine-5,7-dione, or 1H-pyrrolo [3,4-c] pyridine-1,3-dione with monohydrate hydrazine to carry out the 5-exo or 6-endo nitrogen cyclization under the different reaction conditions. Based on the control experimental results, 6-endo thermodynamic hydrohydrazination and kinetical 5-exo cyclization reactions were individually selective formation. Subsequently, Vilsmeier amidination derivatization was successfully developed to probe the structural divergence between N-

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Tran, Vu Phuong, Ngoc Han Pham, and Ngoc Diep Cao. "Bioactive Compounds from Marine Bacterium Bacillus subtilis Strain HD16b by Gas Chromatography-Mass Spectrometry." Pharmaceutical and Chemical Journal 5, no. 2 (2018): 110–18. https://doi.org/10.5281/zenodo.13903755.

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The objectives of this study were analysis of the secondary metabolite products from extract of marine <em>Bacillus subtilis</em> strain HD16b which isolated from sponges at Ha Tien Sea, Kien Giang province, Vietnam. Eight bioactive compounds were identified in the organic solvent ethyl-acetate. The identification of bioactive chemical compounds is based on the peak area, retention time, molecular weight and molecular formular. GC-MS analysis of <em>Bacillus subtilis</em> strain HD16b revealed the existence of the phenylacetic acid, pentadecanoic acid, pyrrolo[1,2-a]pyrazine-1,4-dione, hexahyd

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