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Journal articles on the topic 'Methoxy pyrazines'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Lund, Eric D. "Determination of 2-Methoxy-3-alkylpyrazines in Carrot Products by Gas Chromatography/Nitrogen–Phosphorus Detection." Journal of AOAC INTERNATIONAL 77, no. 2 (1994): 416–20. http://dx.doi.org/10.1093/jaoac/77.2.416.

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Abstract The 2-methoxy-3-alkylpyrazines in 6 types of carrot products were determined by a stripping–selective trapping procedure followed by purge-and-trap gas chromatographic analysis with an NP detector. The aroma threshold of one of the principal pyrazines, 2-methoxy-3-sec-butylpyrazine, in a carrot medium was 0.19 ng/g. The concentrations of this compound in whole-carrot products were 0.43 (fresh), 0.291 (canned, cooked), and 0.224 ng/g (frozen). A diced, cooked, and freeze-dried product contained 0.070 ng/g. All of these products contained only this pyrazine. In contrast, a shredded, bag

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2

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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3

Barlin, GB, LP Davies, SJ Ireland, MML Ngu, and JK Zhang. "Imidazo[1,2-b]pyridazines. XII. Syntheses and Central Nervous System Activities of Some Substituted Imidazo[1,2-b]pyridazines and Related Imidazo[1,2-a]pyridines, Imidazo[1,2-a]pyrimidines and Imidazo[1,2-a]pyrazines." Australian Journal of Chemistry 45, no. 5 (1992): 877. http://dx.doi.org/10.1071/ch9920877.

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Syntheses are reported for some 6-chloro(alkoxy,alkylthio and pheny1thio)-3-benzamidomethyl-(acetamidomethyl and methoxy)-2-arylimidazo[1,2-apyridines and some corresponding imidazo- [1,2- b]pyridazines, imidazo[1,2-a[pyrimidines and imidazo[l,2-a]pyrazines. IC50 values (or percentage displacement) are reported and discussed for the displacement of [3H]diazepam from rat brain membrane by each of these compounds. The imidazo[l,2-a[pyridines were generally slightly less potent than the imidazo[l,2- b]pyridazines but considerably more potent than the corresponding imidazo[1,2-a]pyrimidines or imi

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4

Isbera, Mostafa, Balázs Bognár, Gergely Gulyás-Fekete, Krisztina Kish, and Tamás Kálai. "Syntheses of Pyrazine-, Quinoxaline-, and Imidazole-Fused Pyrroline Nitroxides." Synthesis 51, no. 23 (2019): 4463–72. http://dx.doi.org/10.1055/s-0039-1690678.

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A synthesis of a new diamagnetic synthon, 1-methoxy-2,2,5,5-tetramethylpyrrolidine-3,4-dione, was developed. Condensation of this compound with aliphatic or aromatic 1,2-diamines followed by deprotection yielded pyrroline nitroxide-fused pyrazines, pteridines, or quinoxalines, demonstrated on 7 examples in 15–39% overall yield over 2 or 3 steps. Reaction of the diamagnetic 1,2-diketone with an aldehyde and ammonium acetate produced a pyrrolo[3,4-d]imidazole scaffold in the Debus–Radziszewski reaction.

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5

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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Černý, Ivan, Vladimír Pouzar, Miloš Buděšínský, and Pavel Drašar. "Synthesis of Symmetrical Bis-Steroid Pyrazines Connected via D-Rings." Collection of Czechoslovak Chemical Communications 65, no. 10 (2000): 1597–608. http://dx.doi.org/10.1135/cccc20001597.

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Bis-steroid pyrazines fused through rings D of the steroid skeleton were synthesized. Methods for the preparation of the corresponding rings A fused derivatives (cephalostatin type) were checked on simple androstanes and then a symmetrical D fused analogue, 5α-androstano[16'',17''-5',6']pyrazino[2',3'-16,17]-5α-androstane-3β,3''b-diol, was prepared. Partially substituted bis-steroid pyrazines in both series were prepared and their use for the preparation of higher fused compounds was discussed. No significant cytostatic activity was found on parent bis-steroid pyrazines both A and D fused.

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Ara, Katayoun Mahdavi, Larry T. Taylor, and William M. Coleman. "Conversion of Tobacco Biomass to Flavor Components by Means of Microwave and Parr Reactors." Beiträge zur Tabakforschung International/Contributions to Tobacco Research 27, no. 6 (2017): 102–12. http://dx.doi.org/10.1515/cttr-2017-0011.

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Summary In the present work, microwave and Parr reactors were utilized for synthesis of pyrazines from plant-based biomass in the presence of ammonia and different amino acids. Using these techniques led to synthesis of a relatively wide range of pyrazines with sweet odor and chocolate-like smell. The optimum synthetic conditions to have maximum pyrazine yield for both the microwave and Parr reactions were 41 g of fructose/glucose syrup derived from cellulosic biomass, 28 mL NH4OH (30%), and 0.96 g L-threonine, 0.56 g L-valine, 0.5 g L-leucine, and 0.5 g L-isoleucine at 120 °C for 30 min. Quan

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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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9

Das, Rina, and Dinesh Kumar Mehta. "Evaluation and Docking Study of Pyrazine Containing 1, 3, 4-Oxadiazoles Clubbed with Substituted Azetidin-2-one: A New Class of Potential Antimicrobial and Antitubercular." Drug Research 71, no. 01 (2020): 26–35. http://dx.doi.org/10.1055/a-1252-2378.

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Abstract Background Tuberculosis (TB) caused by Mycobacterium tuberculosis is one of the main killers of people all over the world. The major hurdles with existing therapy are the lengthy regimen and appearance of multi drug resistant (MDR) and extensively drug resistant (XDR) strains of M.tuberculosis. Aims The present work was aimed to synthesize and determine antitubercular and antimicrobial potential of some novel 3-chloro-4-aryl-1-[4-(5-pyrazin-2-yl[1,3,4]oxadiazole-2-ylmethoxy)-phenyl]-azetidin-2-one derivatives 7(a-h) from pyrazinoic acid as precursor, which is a well-established antitu

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Wang, Shijun, Xiaorong Yuan, Hao Qian, Na Li, and Junru Wang. "Design, Synthesis, and Biological Evaluation of Two Series of Novel A-Ring Fused Steroidal Pyrazines as Potential Anticancer Agents." International Journal of Molecular Sciences 21, no. 5 (2020): 1665. http://dx.doi.org/10.3390/ijms21051665.

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Background: Increasingly, different heterocyclic systems have been introduced into the steroid nucleus to significantly enhance the antitumor activities of steroid molecules. However, in this study, few literature precedents describing the pyrazine heterocyclic-condensed modification to an A-ring of steroid monomers were found, although the pyrazine group is thought to be essential for the potent anticancer activity of clinically relevant drugs and natural steroid dimers. Methods and Results: Two series of novel A-ring fused steroidal pyrazines were designed and efficiently synthesized from co

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Ashraf-Khorassani, M., W. M. Coleman III, M. F. Dube, and L. T. Taylor. "Isolation and Purification of Pyrazines Produced by Reaction of Cellulosic-Derived Sugars with NH4OH and Selected Amino Acids." Journal of Chromatographic Science 57, no. 9 (2019): 784–89. http://dx.doi.org/10.1093/chromsci/bmz059.

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Abstract Various pyrazines have been synthesized via reaction of selected cellulosic-derived sugars, ammonium hydroxide and amino acids at 110°C for 2 hours. Different methods of sample cleanup such as liquid–liquid extraction (LLE), liquid–solid extraction, column chromatography and distillation were employed to isolate pyrazines from the reaction mixture. Effective LLE of pyrazines from aqueous solution using either hexane, methyl-t-butyl ether (MTBE) or ethyl acetate required multiple extraction steps with fresh solvent each time. When hexane was used as the extraction solvent, no imidazole

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Collas, Alain, Izabela Bagrowska, Krzysztof Aleksandrzak, Matthias Zeller, and Frank Blockhuys. "Competition between Methoxy-Based and Pyrazine-Based Synthons in Methoxy-Substituted Distyrylpyrazines." Crystal Growth & Design 11, no. 4 (2011): 1299–309. http://dx.doi.org/10.1021/cg101523f.

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13

Pirbazari, M., H. S. Borow, S. Craig, V. Ravindran, and M. J. McGuire. "Physical Chemical Characterization of Five Earthy-Musty-Smelling Compounds." Water Science and Technology 25, no. 2 (1992): 81–88. http://dx.doi.org/10.2166/wst.1992.0038.

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The occurrence of earthy-musty taste and odors in potable water supplies has been attributed to the presence of several organic compounds at ng/l, including geosmin, 2-methylisoborneol (MIB), 2-isobutyl-3-methoxy pyrazine, 2-isopropyl-3-methoxy pyrazine and 2,4,6-trichloroanisole. Microana-lytical techniques were employed for determining the physical/chemical properties of these compounds, hitherto uncharacterized. The properties determined were melting point, boiling point, refractive index, density, aqueous solubility, octanol/water partition coefficient and Henry's law constant. Since stand

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14

Nurhayati, Nurhayati, Francis Maria Constance Sigit Setyabudi, Djagal Wiseso Marseno, and Supriyanto Supriyanto. "The Effects of Roasting Time of Unfermented Cocoa Liquor Using the Oil Bath Methods on Physicochemical Properties and Volatile Compound Profiles." agriTECH 39, no. 1 (2019): 36. http://dx.doi.org/10.22146/agritech.33103.

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This study aimed to measure the effect of roasting time on physicochemical properties and volatile compounds of unfermented cocoa liquor roasted with an oil bath method. Physicochemical properties (pH, temperature, and color), flavor, and volatile compounds were analyzed. The results showed that the longer the roasting time the higher the unfermented cocoa liquor’s temperature, °Hue, and ΔE value, but lower pH and L value. There were 126 volatile compounds obtained by various roasting time, identified as pyrazines (12), aldehydes (16), esters (1), alcohols (31), acids (15), hydrocarbons (11),

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15

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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16

Lynch, DE, G. Smith, KA Byriel, CHL Kennard, and AK Whittaker. "Molecular Cocrystals of Carboxylic Acids. XIV. The Crystal Structures of the Adducts of Pyrazine-2,3-dicarboxylic Acid With 4-Aminobenzoic Acid, 3-Hydroxypyridine and 3-Amino-1,2,4-triazole." Australian Journal of Chemistry 47, no. 2 (1994): 309. http://dx.doi.org/10.1071/ch9940309.

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The 1:1 molecular adducts of pyrazine-2,3-dicarboxylic acid with 4-aminobenzoic acid, [(C6H3N2O4)-(C7H8NO2)+], 3-hydroxypyridine, [(C6H4N2O4) (C5H5NO)], and 3-amino-1,2,4-triazole, [(C6H3N2O4)-(C2H5N4)+] have been prepared, and their structures determined by X-ray diffraction methods. All structures involve intra- and inter-molecular hydrogen-bonding interactions. The 1:2 complex of pyrazine-2,3-dicarboxylic acid with triphenylphosphine oxide has also been prepared, and characterized by using spectroscopic methods.

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17

Rostami, Hedieh, and Lotfi Shiri. "One-pot Multicomponent Synthesis of pyrrolo[1,2-d][1,4]benzoxazines and pyrrolo[1, 2-a]pyrazines in Water Catalyzed by Fe3O4@SiO2@L-Arginine-SA Magnetic Nanoparticles." Current Organic Synthesis 17, no. 6 (2020): 473–82. http://dx.doi.org/10.2174/1573409916666200128163047.

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Aims: Synthesis of pyrrolo[1,2-d][1,4]benzoxazines and pyrrolo[1,2-a]pyrazines using magnetic nanoparticles. Background: One-pot, three component reaction for the synthesis of pyrrolo[1,2-d][1,4]benzoxazines and pyrrolo[1,2-a]pyrazines is reported. For the synthesis of pyrrolo[1,2-d][1,4]benzoxazines use of 2- aminophenols, dialkylacetylenedicarboxylates and β -nitrostyrene derivatives and Pyrrolo[1,2-a]pyrazines synthesized from reaction of ethylenediamine, dialkylacetylenedicarboxylates and β-nitrostyrene derivatives is discussed. Materials and Methods: 2-aminophenol (0.5 mmol) and dimethyla

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Devys, Michel, Michel Barbier, Albert Kollmann, and Jean-François Bousquet. "N-Methoxy septorinol, a substituted pyrazine from the fungus Septoria nodorum." Phytochemistry 31, no. 12 (1992): 4393–94. http://dx.doi.org/10.1016/0031-9422(92)80492-w.

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19

Klein, Ch Th, H. Pircher, B. Wailzer, G. Buchbauer, and P. Wolschann. "Quantitative Structure-Property Study on Pyrazines with Bell Pepper Flavor." Scientia Pharmaceutica 68, no. 1 (2000): 41–56. http://dx.doi.org/10.3797/scipharm.aut-00-04.

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A quantitative structure-property (QSPR) study on pyrazines with bell pepper aroma is performed by means of different statistical methods, which correlate appropriate molecular descriptors with the biological activity. The different methods lead to consistent results, indicating which of the molecular properties of the compounds under consideration are significant for bell pepper flavor. These results are compared with other models.

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20

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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21

Ingham, Richard J., Claudio Battilocchio, Joel M. Hawkins, and Steven V. Ley. "Integration of enabling methods for the automated flow preparation of piperazine-2-carboxamide." Beilstein Journal of Organic Chemistry 10 (March 12, 2014): 641–52. http://dx.doi.org/10.3762/bjoc.10.56.

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Here we describe the use of a new open-source software package and a Raspberry Pi® computer for the simultaneous control of multiple flow chemistry devices and its application to a machine-assisted, multi-step flow preparation of pyrazine-2-carboxamide – a component of Rifater®, used in the treatment of tuberculosis – and its reduced derivative piperazine-2-carboxamide.

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22

Liu, M., R. D. Farrant, J. C. Lindon, and P. Barraclough. "An Investigation of Protonation in 2-Methoxy Pyrazine Using13C AND15N NMR Spectroscopy." Spectroscopy Letters 24, no. 5 (1991): 665–69. http://dx.doi.org/10.1080/00387019108018147.

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23

Allen, Malcolm S., Michael J. Lacey, and Stephen J. Boyd. "Methoxypyrazines in Red Wines: Occurrence of 2-Methoxy-3-(1-methylethyl)pyrazine." Journal of Agricultural and Food Chemistry 43, no. 3 (1995): 769–72. http://dx.doi.org/10.1021/jf00051a038.

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24

Khavasi, Hamid Reza, Mahdieh Hosseini, Alireza Azhdari Tehrani, and Soheila Naderi. "Strengthening N⋯X halogen bonding via nitrogen substitution in the aromatic framework of halogen-substituted arylpyrazinamides." CrystEngComm 16, no. 21 (2014): 4546–53. http://dx.doi.org/10.1039/c3ce41856a.

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25

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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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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Rezaee, Zahra, and Faranak Manteghi. "Application of a Terephthalate and Pyrazine-Based MOF in Cr Adsorption." Proceedings 41, no. 1 (2019): 60. http://dx.doi.org/10.3390/ecsoc-23-06484.

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In this study, a terephthalate and pyrazine-based metal–organic framework (MOF) was prepared using the oxygen and nitrogen donor ligands through the hydrothermal method. In the MOF, cobalt and nickel ions were selected as metal nodes which are connected by terephthalate and pyrazine linkers. The as-prepared MOF was utilized as Cr adsorbent in water by an ultrasonic method. The MOF capacity towards chromium ion adsorption was obtained about 96% in 50 ppm initial concentration. In order to characterize and determine the morphology of the title MOF, the FT-IR and XRD methods were applied, while t

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Bungert, Michael, Thomas Jahns, and Hans Becker. "2-Methoxy-3-(1?-methylpropyl)pyrazine, pea odour, from the marine bacteriumHalomonas venusta." Flavour and Fragrance Journal 16, no. 5 (2001): 329–33. http://dx.doi.org/10.1002/ffj.1004.

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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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Mebarki, Fatiha, and Khadidja Amirat. "Treatment by Alternative Methods of Regression Gas Chromatographic Retention Indices of 35 Pyrazines." International Journal of Instrumentation and Control Systems 6, no. 1 (2016): 1–14. http://dx.doi.org/10.5121/ijics.2016.6101.

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Mebark, Fatiha, Khadidja Amirat, Salima Ali Mokhnache, and Djelloul Messadi. "Treatment by Alternative Methods of Regression Gas Chromatographic Retention Indices of 35 Pyrazines." International Journal on Soft Computing 7, no. 1 (2016): 27–40. http://dx.doi.org/10.5121/ijsc.2016.7103.

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Verevkin, Sergey P., Vladimir N. Emel’yanenko, Riko Siewert, and Aleksey A. Pimerzin. "Energetics of LOHC: Structure-Property Relationships from Network of Thermochemical Experiments and in Silico Methods." Hydrogen 2, no. 1 (2021): 101–21. http://dx.doi.org/10.3390/hydrogen2010006.

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The storage of hydrogen is the key technology for a sustainable future. We developed an in silico procedure, which is based on the combination of experimental and quantum-chemical methods. This method was used to evaluate energetic parameters for hydrogenation/dehydrogenation reactions of various pyrazine derivatives as a seminal liquid organic hydrogen carriers (LOHC), that are involved in the hydrogen storage technologies. With this in silico tool, the tempo of the reliable search for suitable LOHC candidates will accelerate dramatically, leading to the design and development of efficient ma

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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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Ayudha, Vety Sri Harlinda, and Mokhamat Ariefin. "Synthesis and Characterization of Pyrazine Derived Compounds as Potential Materials for Hole Transporting Layer (HTL)." Jurnal Kimia Sains dan Aplikasi 23, no. 6 (2020): 228–33. http://dx.doi.org/10.14710/jksa.23.6.228-233.

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Three simple compounds that have the potential as a hole transporting layer (HTL) based on pyrazine derivatives conjugated with electron donor groups in the form of triphenylamine have been successfully synthesized and characterized. The synthesis began with a substitution reaction at high temperatures between 4-bromoaniline and 4-iodoanisole to produce 4-bromo-N,N-bis(methoxyphenyl)-aniline, followed by substitution of bromo atoms with tributylstanum at low temperatures and inert atmosphere (N2) producing 4-methoxy-N-(4-(tributylstanyl)phenyl)aniline. The conjugation reaction was carried out

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35

Asgaonkar, Kalyani Dhirendra, Shital Manoj Patil, Trupti Sameer Chitre, et al. "Comparative Docking Studies: A Drug Design Tool for Some Pyrazine- Thiazolidinone Based Derivatives for Anti-HIV Activity." Current Computer-Aided Drug Design 15, no. 3 (2019): 252–58. http://dx.doi.org/10.2174/1573409915666181219125944.

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<P>Background: Acquired immunodeficiency Syndrome (AIDS) is caused by Human immunodeficiency virus type 1 (HIV-1). Pyrazine and Thiazolidinone pharmacophore has diverse biological activities including anti HIV activity. </P><P> Aims and Objectives: To study binding behavior of Pyrazine- thiazolidinone derivatives on four different crystal structures of HIV- 1RT.These molecules which were already reported as anti-TB were investigated for dual activity as Anti-HIV and Anti-TB. </P><P> Materials and Methods: In the present study we describe a comparative docking stud

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Belhassan, Assia, Samir Chtita, Tahar Lakhlifi, and Mohammed Bouachrine. "2D-QSPR Study of Olfactive Thresholds for Pyrazine Derivatives Using DFT and Statistical Methods." Emerging Science Journal 3, no. 3 (2019): 179–86. http://dx.doi.org/10.28991/esj-2019-01180.

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In this study, we have established two-dimensional quantitative structure propriety relationships (2D-QSPR) model, for a group of 78 molecules based on pyrazine, these molecules were subjected to a 2D-QSPR analyze for their odors thresholds propriety using stepwise Multiple Linear Regression (MLR). The 35 parameters are calculated for the 78 studied compounds using the Gaussian 09W, ChemOffice and ChemSketch softwares. Quantum chemical calculations are used to calculate electronic and quantum chemical descriptors, using the density functional theory (B3LYP/6-31G (d) DFT) methods.The model was

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Sokolenko, Taras M., and Yurii L. Yagupolskii. "Trifluoromethoxypyrazines: Preparation and Properties." Molecules 25, no. 9 (2020): 2226. http://dx.doi.org/10.3390/molecules25092226.

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The incorporation of the trifluoromethoxy group into organic molecules has become very popular due to the unique properties of the named substituent that has a “pseudohalogen” character, while the chemical properties of the synthesized compound, especially heterocycles with such a group, are less studied. As trifluoromethoxy-substituted pyrazines are still unknown, we have developed efficient and scalable methods for 2-chloro-5-trifluoromethoxypyrazine synthesis, showing the synthetic utility of this molecule for Buchwald-Hartwig amination and the Kumada-Corriu and Suzuki and Sonogashira coupl

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Taranu, Bogdan-Ovidiu, Vicentiu Vlaia, Mariana-Nela Stefanut, Valeria Nandina Vlatanescu, Marius-Ciprian Dobrescu, and Iuliana Popa. "ANALYSIS METHODS FOR PYRAZINE-2,3-DICARBOXYLIC ACID SYNTHESIZED USING ELECTROCHEMICALLY REGENERATED KMnO4." Environmental Engineering and Management Journal 9, no. 8 (2010): 1115–20. http://dx.doi.org/10.30638/eemj.2010.144.

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Romero, Raquel, Juan Luis Chacón, Esteban García, and Jesús Martínez. "Pyrazine contents in four red grape varietes cultivated in warm climate." OENO One 40, no. 4 (2006): 203. http://dx.doi.org/10.20870/oeno-one.2006.40.4.861.

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<p style="text-align: justify;">We analysed 2-methoxy-3-ethylpyrazine and 2-methoxy-3-isobutylpyrazine content in 4 grape varieties cultivated in Castilla-La Mancha. A sensory analysis of the wines obtained from these grapes was also performed. The results revealed the presence of the two methoxypyrazines studied in all four varieties, in concentrations lower than those published for these varieties in regions with cooler climates. Significant differences were observed in 2-methoxy-3-isobutylpyrazine content between the different varieties: Cabernet-Sauvignon&gt;Merlot&gt;Syrah&a

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AKKURT, Mehmet, Ali Asghar JARRAHPOUR, Maaroof ZAREI, and Orhan BÜYÜKGÜNGÖR. "Crystal Structure of 2-Methoxy-6-(pyrazin-2-yl iminomethyl)phenol, C12H11N3O2." Analytical Sciences: X-ray Structure Analysis Online 21 (2005): x117—x118. http://dx.doi.org/10.2116/analscix.21.x117.

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Kocyigit-Kaymakcioglu, Bedia, Senem Sinem Yazici, Fatih Tok, et al. "Synthesis and Anticancer Activity of New Hydrazide-hydrazones and Their Pd(II) Complexes." Letters in Drug Design & Discovery 16, no. 5 (2019): 522–32. http://dx.doi.org/10.2174/1570180815666180816124102.

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Background: Hydrazones, one of the important classes of organic molecules, are pharmaceutical agents comprising –CO-NH-N=CH- group in the structure therefore and exhibiting significant biological activity. Methods: 5-Chloro-N’-[(substituted)methylidene] pyrazine-2-carbohydrazide (3a-g) and their Pd(II) complexes (4a-h) were synthesized and investigated in vitro anticancer activity on A549, Caco2 cancer and normal 3T3 fibroblast cell lines, using the MTT assay. Results: Anticancer activity screening results revealed that some compounds showed remarkable cytotoxic effect. Among them, 5-chloro-N'

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Jaramillo, David A., María J. Méndez, Gabriela Vargas, et al. "Biocatalytic Potential of Native Basidiomycetes from Colombia for Flavour/Aroma Production." Molecules 25, no. 18 (2020): 4344. http://dx.doi.org/10.3390/molecules25184344.

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Aromas and flavours can be produced from fungi by either de novo synthesis or biotransformation processes. Herein, the biocatalytic potential of seven basidiomycete species from Colombia fungal strains isolated as endophytes or basidioma was evaluated. Ganoderma webenarium, Ganoderma chocoense, and Ganoderma stipitatum were the most potent strains capable of decolourizing β,β-carotene as evidence of their potential as biocatalysts for de novo aroma synthesis. Since a species’ biocatalytic potential cannot solely be determined via qualitative screening using β,β-carotene biotransformation proce

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Smyth, D. A., C. Macku, O. E. Holloway, D. M. Deming, L. Slade, and H. Levine. "Evaluation of Analytical Methods for Optimizing Peanut Roasting for Snack Foods." Peanut Science 25, no. 2 (1998): 70–76. http://dx.doi.org/10.3146/i0095-3679-25-2-3.

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Abstract Roasting Arachis hypogaea L. seeds for snack foods requires control of roasting temperature and time to optimize eating quality. Extra large virginia and jumbo runner peanut seeds were oil roasted at different thermal input levels to examine relationships between roast color and other analytical measurements related to roast quality. A laboratory roaster and commercial lots of peanut seeds were used to simulate the commercial process. The concentration of volatiles such as pyrazines increased in roasted seeds with increased thermal energy. Descriptive sensory analyses on these same ro

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Xie, Weiwei, Marin Sapunar, Nađa Došlić, Matthieu Sala, and Wolfgang Domcke. "Assessing the performance of trajectory surface hopping methods: Ultrafast internal conversion in pyrazine." Journal of Chemical Physics 150, no. 15 (2019): 154119. http://dx.doi.org/10.1063/1.5084961.

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Gettys, Kristen, Zhishi Ye, and Mingji Dai. "Recent Advances in Piperazine Synthesis." Synthesis 49, no. 12 (2017): 2589–604. http://dx.doi.org/10.1055/s-0036-1589491.

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Piperazine ranks as the third most common N-heterocycle appearing in small-molecule pharmaceuticals. This review highlights recent advances in methods development for the construction of the piperazine ring system with particular emphasis on preparing carbon-substituted piperazines.1 Introduction2 Reduction of (Di)ketopiperazine3 N-Alkylation4 Transition-Metal-Catalyzed/Mediated Piperazine Synthesis4.1 The SnAP and SLAP Methods4.2 Palladium-Catalyzed Cyclization4.3 Gold-Catalyzed Cyclization4.4 Other Metal-Catalyzed/Mediated Cyclization4.5 Borrowing Hydrogen Strategy4.6 Imine Reductive Cycliz

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Hernani, Hernani, and Winda Haliza. "OPTIMASI KOMPOSISI NUTRIEN UNTUK PEMBENTUKAN KOMPONEN CITARASA PADA FERMENTASI BIJI KAKAO ASALAN (Optimization of nutrient composition during fermentation on unfermented cocoa beans to enchance flavor components production)." Jurnal Penelitian Pascapanen Pertanian 10, no. 2 (2017): 71. http://dx.doi.org/10.21082/jpasca.v10n2.2013.71-82.

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<p>Pengolahan biji kakao tanpa melalui proses fermentasi biasanya disebut sebagai biji kakao asalan. Di Indonesia, petani masih jarang melakukan fermentasi karena harga jual biji fermentasi dan asalan, tidak jauh berbeda. Dengan melakukan fermentasi kembali pada biji kakao asalan menggunakan kultur mikroba sebagai nutrien diharapkan menghasilkan komponen citarasa sama seperti kakao yang difermentasi. Adapun tujuan dari penelitian adalah untuk mendapatkan komposisi substrat atau media tumbuh yang sesuai untuk aplikasi fermentasi biji kakao asalan sehingga akan diperoleh starter kultur mik

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Jarrahpour, A., M. Motamedifar, N. Hadi, and M. Zarei. "Synthesis of 2-methoxy-6-(pyrazin-2-ylimino methyl) phenol and its antibacterial activitity." Molbank 2004, no. 1 (2004): M373. http://dx.doi.org/10.3390/m373.

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Han, Sunghwa, Kwang-Kyun Park, Won-Yoon Chung, Sang Kook Lee, Jaekyung Kim, and Jae-Kwan Hwang. "Anti-photoaging effects of 2-methoxy-5-(2-methyl propyl) pyrazine isolated from peach (Prunus persica (L.) Batsch)." Food Science and Biotechnology 19, no. 6 (2010): 1667–71. http://dx.doi.org/10.1007/s10068-010-0236-2.

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49

Smith, Graham, Katherine E. Baldry, Karl A. Byriel, and Colin H. L. Kennard. "Molecular Cocrystals of Carboxylic Acids. XXV The Utility of Urea in Structure Making with Carboxylic Acids and the Crystal Structures of a Set of Six Adducts with Aromatic Acids." Australian Journal of Chemistry 50, no. 7 (1997): 727. http://dx.doi.org/10.1071/c96199.

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Molecular adducts of urea with six aromatic carboxylic acids have been prepared and characterized by using X-ray diffraction methods and infrared spectroscopy. These compounds are with 5-nitrosalicylic acid [(C7H5NO5)2(CH4N2O)] (1), 3,5-dinitrosalicylic acid [(C7H4N2O7)(CH4N2O)] (2), 4-aminobenzoic acid [(C7H7NO2)2(CH4N2O)] (3), o-phthalic acid [(C8H6O4)(CH4N2O)] (4), pyrazine-2,3-dicarboxylic acid [(C4H4N2O4)(CH4N2O)] (5) and pyridine-2,6-dicarboxylic acid [(C7H5NO4)(CH4N2O)2] (6). In the majority of the adducts, all six potential interactive sites on the urea molecules are utilized in hydrog

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Smith, Graham, and Colin H. L. Kennard. "The Crystal and Molecular Structure of the 1:1 Adduct Hydrate of Pyrazine-2,3-dicarboxylic Acid with 1,1-Diethylurea." Australian Journal of Chemistry 53, no. 12 (2000): 999. http://dx.doi.org/10.1071/ch00150.

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The adduct hydrate of 1,1-diethylurea with pyrazine-2,3-dicarboxylic acid, [(C6H4N2O4)(C5H12N2O)].H2O has been prepared and characterized using low-temperature single-crystal X-ray diffraction methods. A primary asymmetric cyclic hydrogen-bonding interaction, similar to those found in other adducts of 1,1-diethylurea with the nitro-substituted aromatic acids, was found between the amide group of the substituted urea and one carboxylic acid group of the acid. Further peripheral hydrogen-bonding associations involving both the f irst and the second carboxylic acid groups, urea and the lattice wa

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