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Journal articles on the topic '2-α]pyridine'

Author: Grafiati

Published: 5 June 2025

Last updated: 1 August 2025

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1

Suáarez, M., R. Llavona, M. L. Rodríguez, L. M. Barcina, A. Anillo та J. Rodríguez. "Intercalation of cyclic amines in α–hafnium bis(hydrogen phosphate) monohydrate". Journal of Materials Research 13, № 5 (1998): 1218–24. http://dx.doi.org/10.1557/jmr.1998.0173.

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The intercalation in vapor phase of cyclic amines (aniline, benzylamine, cyclohexylamine, piperidine, and pyridine) in α–hafnium bis(hydrogen phosphate) monohydrate (α–HfP) has been investigated. Elemental and thermal analysis lead to the establishment of the intercalate composition. The general formula is x[Hf(HPO4)2 · y amine H2O] (1 - x) α–HfP where y = 2, 1 and x ≤ 1. When y = 1 (piperidine and pyridine) the amines form a monomolecular layer. When y = 2 (aniline, benzylamine, and cyclohexylamine) the arrangement is bimolecular. The results are compared to those described for α–ZrP.

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2

Neidle, S., D. C. Capaldi, J. V. Bernadette та C. B. Reese. "The α-Pyridyl Nucleoside Analogue 2-Bromo-5-(2-deoxy-α-D-ribofuranosyl)pyridine". Acta Crystallographica Section C Crystal Structure Communications 52, № 2 (1996): 407–9. http://dx.doi.org/10.1107/s0108270195013060.

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3

Kumar, Birendra, Rekha Rani, Dayanand Prasad, Praveen Kumar Singh, Amit Kumar, and Shivadhar Sharma. "Electronic Structure and Spectral Study of Some Five Coordinate Complexes of Copper (II)." Oriental Journal Of Chemistry 35, no. 4 (2019): 1463–68. http://dx.doi.org/10.13005/ojc/350430.

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1-phenylazo-2-nephthol has been synthesized and used for complexation with Cu(II) metal ion along with pyridine, α-picoline, β- picoline, γ-picoline and water as secondary ligands. On the basis of elemental analysis and molar conductivity complexes were formulated as CuL2X [Where L is the prime ligand i.e 1-phenyl-azo-2-nephthol and X is the secondary ligand i.e. pyridine, α-picoline, β-picoline, and H2O.] The magnetic moment of these complexes (1.80 - 1.83 BM) indicates that these complexes are magnetically dilute. The appearance of 3 bands in the electronic spectra of complexes rules out the

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4

Davies, Stephen G., та Mark R. Shipton. "Pyridine chromium tricarbonyl complexes: completely stereoselective α,α-dialkylation of 2-methylpyridine tricarbonylchromium". J. Chem. Soc., Chem. Commun., № 24 (1990): 1780–81. http://dx.doi.org/10.1039/c39900001780.

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5

Motevalli, Kourosh, Zahra Yaghoubi та Roghieh Mirzazadeh. "Microwave-Assisted, One-Pot Three Component Synthesis of 2-PhenylH-imidazo[1,2-α]pyridine". E-Journal of Chemistry 9, № 3 (2012): 1047–52. http://dx.doi.org/10.1155/2012/198615.

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A novel synthesis of 2-phenylH-imidazio[1,2-α] pyridines is described from a one-pot, three-component reaction between pyridine, guanidine (urea or thiourea) and α-bromoketones under microwave irradiation and solvent-free conditions in excellent yields.

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6

Usoltsev, A. N., I. V. Korol’kov, and S. A. Adonin. "Bromoantimonates(III) vs. Bromobismuthates(III): Differences in the Tendency for the Formation of Polynuclear Complexes." Координационная химия 49, no. 6 (2023): 341–46. http://dx.doi.org/10.31857/s0132344x22600400.

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Pyridine-based Sb(III) bromide complexes with doubly charged cations, (PyC3)3[Sb2Br9]2 (I), (PyC4)[Sb2Br8] (II), (PyC5)2[α-Sb4Br16] (III), (PyC6)2[Sb2Br10] (IV), (4-MePyC2)2[Sb2Br10] (V), (4‑MePyC3)2[α-Sb4Br16] (VI), and (4-MePyC5)2[α-Sb4Br16] (VII), were synthesized and characterized by X-ray diffraction (CCDC nos. 2204718–2204724). The structures of these compounds were compared with the structures of related bromobismuthates(III).

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7

Hashmi, Imran Ali, Holger Feist, Manfred Michalik, Helmut Reinke та Klaus Peseke. "Dimethylaminomethylene-α-D-xylo-hept-5-ulofuranurononitrile as Building Block in the Synthesis of ‘Reversed’ C-Nucleoside Analogues". Zeitschrift für Naturforschung B 61, № 3 (2006): 292–300. http://dx.doi.org/10.1515/znb-2006-0309.

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Abstract 3-O-Benzyl-6-deoxy-1,2-O-isopropylidene-6-(dimethylaminomethylene)-α-D-xylo-hept-5-ulofuranurononitrile (1) was reacted with amidinium salts, S-methylisothiouronium sulfate, and guanidinium chloride, respectively, in the presence of bases to furnish the 4-(3-O-benzyl-1,2-O-isopropylidene- α-D-xylo-tetrofuranos-4-yl)pyrimidine-5-carbonitriles 2 and the 4-(1,2-O-isopropylidene- α-D-glycero-tetr-3-enofuranos-4-yl)pyrimidine-5-carbonitriles 3, respectively. Treatment of 1 with ethyl 5-aminopyrazole-4-carboxylates yielded the ethyl 7-(3-O-benzyl-1,2-O-isopropylidene- α-D-xylo-tetrofuranos-

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8

Pięta, Ewa, Edyta Proniewicz, Bogdan Boduszek, Tomasz K. Olszewski, Younkyoo Kim, and Leonard M. Proniewicz. "Exploring the Isomer Dependent SERS Spectra of (diphenylphosphoryl)(pyridin-2, -3, and -4-yl)methanol Adsorbed on Gold Nanocolloids." Journal of Spectroscopy 2014 (2014): 1–7. http://dx.doi.org/10.1155/2014/894749.

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The surface-enhanced Raman scattering (SERS) spectra of three aminophosphonate derivatives of pyridine: (diphenylphosphoryl)(pyridin-2-yl)methanol (α-Pyr), (diphenylphosphoryl)(pyridin-3-yl)methanol (β-Pyr), and (diphenylphosphoryl)(pyridin-4-yl)methanol (γ-Pyr) were measured after immobilization onto colloidal gold surface. Changes in the wavenumber, broadness, and enhancement between the corresponding Raman and SERS bands allowed to deduce orientation of theα-,β-, andγ-isomers (α-,β-, andγ-refer to the position of the substituent relative to the ring nitrogen atom) of aminophosphonate deriva

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9

Li, Bin, Nana Shen, Yujie Yang, Xinying Zhang, and Xuesen Fan. "Synthesis of naphtho[1′,2′:4,5]imidazo[1,2-a]pyridines via Rh(iii)-catalyzed C–H functionalization of 2-arylimidazo[1,2-a]pyridines with cyclic 2-diazo-1,3-diketones featuring with a ring opening and reannulation." Organic Chemistry Frontiers 7, no. 7 (2020): 919–25. http://dx.doi.org/10.1039/d0qo00073f.

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An unprecedented synthesis of functionalized naphtho[1′,2′:4,5]imidazo[1,2-a]pyridines via rhodium-catalyzed cascade reactions of 2-arylimidazo[1,2-a]pyridine-3-carbaldehydes with cyclic α-diazo-1,3-diketones is presented.

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10

Dotsenko, Victor V., Nawras T. Jassim, Azamat Z. Temerdashev, Zainab R. Abdul-Hussein, Nicolai A. Aksenov, and Inna V. Aksenova. "New 6′-Amino-5′-cyano-2-oxo-1,2-dihydro-1′H-spiro[indole-3,4′-pyridine]-3′-carboxamides: Synthesis, Reactions, Molecular Docking Studies and Biological Activity." Molecules 28, no. 7 (2023): 3161. http://dx.doi.org/10.3390/molecules28073161.

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The purpose of this work was to prepare new isatin- and monothiomalondiamide-based indole derivatives, as well as to study the properties of the new compounds. The four-component reaction of 5-R-isatins (R = H, CH3), malononitrile, monothiomalonamide (3-amino-3-thioxo- propanamide) and triethylamine in hot EtOH yields a mixture of isomeric triethylammonium 6′-amino-3′-(aminocarbonyl)-5′-cyano-2-oxo-1,2-dihydro-1′H- and 6′-amino-3′-(aminocarbonyl)- 5′-cyano-2-oxo-1,2-dihydro-3′H-spiro[indole-3,4′-pyridine]-2′-thiolates. The reactivity and structure of the products was studied. We found that oxi

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11

Rodríguez-Castellón, E., P. Olivera-Pastor, A. Jiménez-López, P. Maireles-Torres, M. J. Hudson та P. Sylvester. "Intercalation of aromatic amines into α-tin(IV) hydrogenphosphate monohydrate". Canadian Journal of Chemistry 67, № 12 (1989): 2095–101. http://dx.doi.org/10.1139/v89-326.

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Aromatic amines such as o-phenylenediamine, m-phenylenediamine, p-phenylenediamine, benzidine, and 2-amino-4-methylpyridine were intercalated into tin(IV) hydrogen phosphate monohydrate (α-Sn(HPO4)2•H2O). o-Phenylenediamine and 2-amino-4-methylpyridine form a bilayer, while m-phenylenediamine, p-phenylenediamine, and benzidine form a monolayer. Phenylenediamines are monoprotonated on the interlayer surface of the phosphate, whereas benzidine is diprotonated. 2-Amino-4-methylpyridine exhibits a different behaviour with respect to pyridine, because the positive charge is localized between the tw

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12

Krečmerová, Marcela, Hubert Hřebabecký, Milena Masojídková, and Antonín Holý. "2',3'-Dideoxy- and 3'-Azido-2',3'-dideoxynucleosides of 5-Phenyl-2(1H)-pyrimidinone. Preparation of 2',3'-Dideoxypentofuranoses." Collection of Czechoslovak Chemical Communications 61, no. 3 (1996): 478–88. http://dx.doi.org/10.1135/cccc19960478.

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The synthesis of methyl 3-azido-5-benzoyl-2,3-dideoxy-β-D-ribofuranoside (10) from methyl 2-deoxy-D-ribofuranoside (1) and its use for the preparation of 3'-azido-2',3'-dideoxy-β-D-ribofuranosides is described. Reaction of methylglucoside 1 with benzoyl chloride in pyridine afforded 5-O-benzoyl derivative 2, which on oxidation with complex of chromium trioxide, pyridine and acetic anhydride afforded 3-keto derivative 3. This was reduced with sodium borohydride in ethanol to give a mixture of methyl 2-deoxyglycosides of α-D-ribo- (4) and β-D-xylo- (5) configuration. Their mesyl derivatives 6 an

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13

Galvez, Enrique, Isabel Iriepa, Antonio Lorente, Jose Miguel Mohedano, Feliciana Florencio, and Severino Garcia-Blanco. "Synthesis and structural study of aminals derived from 8-aminoquinoline and 1-aminonaphtalene." Canadian Journal of Chemistry 65, no. 4 (1987): 687–92. http://dx.doi.org/10.1139/v87-117.

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Reaction of 8-aminoquinoline with pyridine-2-carboxaldehyde (2), pyridine-3-carboxaldehyde (3), pyridine-4-carboxaldehyde (4), and benzaldehyde (5) yields the corresponding aminals or Schiff's bases according to reaction conditions; analogous results are obtained from the reaction of 1-amino-naphtalene with pyridine-2-carboxaldehyde (6). On the other hand, reaction of 8-aminoquinoline with thiophene-2-carboxaldehyde or pyrrole-2-carboxaldehyde yields neither the aminal nor the Schiff's base. Crystals of 4 (C24H19N5) belong to the triclinic space group [Formula: see text]. Cell dimensions are a

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14

M., J. Ladani, D. Tala S., D. Akbari J., F. Dhaduk M. та S. Joshi H. "Synthesis and biological study of oxopyrimidines and thiopyrimidines of 2-(2,4-dichlorophenyl)imidazo[1,2-α ]pyridin-3-carbaldehyde". Journal of Indian Chemical Society Vol. 86, Jan 2009 (2009): 104–8. https://doi.org/10.5281/zenodo.5807328.

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Department of Chemistry, Saurashtra University, Rajkot-360 005, Gujarat, India <em>E-mail</em> : drhsjoshi49@gmail.com <em>Manuscript received 14 November 2007, revised 6 August 2008, accepted 17 September 2008</em> 2-(2,4-Dichlorophenyl)imidazo[1,2-α]pyridlne-3·carbaldehyde (1) was prepared from 2-aminopyridine through multi-step reaction. Compound 1 reacts with different aryl ketones in the presence of catalytic amount of 40% KOH to give (2<em>E</em>)-3-[2-(2,4-dichlorophenyl)imidazo[1,2-α]pyridin-3-yl]-1-arylprop-2-en-1-ones (2a-j), which on cyclization with urea and

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15

Maryanoff, Bruce E., та Han-Cheng Zhang. "Pyridine-containing macrocycles via cobalt-mediated [2 + 2 + 2] cycloadditions of α,ω-bis-alkynes". Arkivoc 2007, № 12 (2007): 7–35. http://dx.doi.org/10.3998/ark.5550190.0008.c02.

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16

Li, Zhaopeng, Junle Zhang, Peng Fu та ін. "An unconventional route to fabricate highly pure α-Al2O3 nanocrystals with tunable surface chemistry based on a semi-aromatic polyamide with pyridine rings as a functional matrix". RSC Advances 6, № 83 (2016): 79263–67. http://dx.doi.org/10.1039/c6ra19354d.

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Highly pure α-Al<sub>2</sub>O<sub>3</sub> colloidal nanocrystals with tunable surface chemistry and dimensions were fabricated using semi-aromatic polyamide (PA6Py) with pyridine rings as a functional matrix.

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17

Zaki, Dr Remon M., Prof Adel M. Kamal El-Dean, Dr Nermin A. Marzouk, Prof Jehan A. Micky, and Mrs Rasha H. Ahmed. "A FACILE SYNTHESIS AND REACTIONS OF AMINO SELENOLO[2,3-b]PYRIDINE CARBOXYLATE." JOURNAL OF ADVANCES IN CHEMISTRY 12, no. 1 (2015): 3910–18. http://dx.doi.org/10.24297/jac.v12i1.845.

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Incorporating selenium metal bonded to the pyridine nucleus was achieved by the reaction of selenium metal with 2-chloropyridine carbonitrile 1 in the presence of sodium borohydride as reducing agent. The resulting non isolated selanyl sodium salt was subjected to react with various α-halogenated carbonyl compounds to afford the selenyl pyridine derivatives 3a-f which compounds 3a-d underwent Thorpe-Ziegler cyclization to give 1-amino-2-substitutedselenolo[2,3-b]pyridine compounds 4a-d, while the other compounds 3e,f failed to be cyclized. Basic hydrolysis of amino selenolo[2,3-b]pyridine carb

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18

Yamauchi, Daisuke, Ikumi Nakamura та Takahiro Nishimura. "Iridium-catalyzed enantioselective addition of an N-methyl C–H bond to α-trifluoromethylstyrenes via C–H activation". Chemical Communications 57, № 89 (2021): 11787–90. http://dx.doi.org/10.1039/d1cc05076a.

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The Ir-catalyzed enantioselective addition of an N-methyl C–H bond of 2-(methylamino)pyridine derivatives to α-trifluoromethylstyrenes proceeded via C–H activation to give chiral γ-branched amines having a trifluoromethyl-substituted stereocenter.

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19

Cascella, Barbara, Soon Goo Lee, Sukrit Singh, Joseph M. Jez, and Liviu M. Mirica. "The small molecule JIB-04 disrupts O2binding in the Fe-dependent histone demethylase KDM4A/JMJD2A." Chemical Communications 53, no. 13 (2017): 2174–77. http://dx.doi.org/10.1039/c6cc09882g.

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The pyridine hydrazone JIB-04, a specific inhibitor of Fe- and α-ketoglutarate-dependent, O<sub>2</sub>-activating histone lysine demethylases, is found to block the binding of O<sub>2</sub>in KDM4A through an O<sub>2</sub>-consumption assay, X-ray crystal structure data, and molecular modeling.

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20

Christophersen, Ruth, Wolfgang Willing, Ulrich Müller та Kurt Dehnicke. "Kristallstruktur von β-VCl2(N3S2). Synthese und Kristallstruktur von [VCl(N3S2)(Pyridin)2]2·2 CH2Cl2, einem Cyclothiazenokomplex mit Vanadium(IV)/Crystal Structure of β-VCl2(N3S2). Synthesis and Crystal Structure of [VCl(N3S2)(pyridine)2]2·2 CH2Cl2, a Cyclothiazeno Complex with Vanadium (IV)". Zeitschrift für Naturforschung B 41, № 11 (1986): 1420–25. http://dx.doi.org/10.1515/znb-1986-1116.

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Abstract β-VCl2(N3S2) was obtained by sublimation. It represents a new modification compared to the known α-VCl2(N3S2) which can be obtained from solution. Its crystal structure was determined by X-ray diffraction (864 observed reflexions, R = 0.034). Crystal data: triclinic, space group P1̄, Z = 2, a = 570.0, b = 779.9, c = 735.3 pm , α = 90.85°, β = 108.26°, y = 98.77°. Both modifications consist of polymer chains in which the vanadium atoms are linked alternatively by chloro and nitrogen bridges. The packing of the chains is rather similar, the only difference being that in β-VCl2(N3S2) the

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21

Stein, P., H. K. Mahtani та I. Black. "A raman spectroscopic study of platinum complexes of α-pyridone pyridine-2-thiol and α-pyrrolidone". Journal of Inorganic Biochemistry 36, № 3-4 (1989): 256. http://dx.doi.org/10.1016/0162-0134(89)84322-3.

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22

G., Kavitha, та Vedhi C. "Synthesis and characterization of benzoin α-oxime and 2,6-pyridine dimethanol and its application of anti-corrosion behaviour". Journal of Indian Chemical Society Vol. 96, Jan 2019 (2019): 48–51. https://doi.org/10.5281/zenodo.5652749.

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Department of Chemistry, Rajalakshmi Institute of Technology, Kuthambakkam-600 124, Tamilnadu, India Department of Chemistry, V.O. Chidambaram College, Thoothukudi-628 008, Tamilnadu, India <em>E-mail</em>: cvedhi@rediffmail.com, cvedhi23@gmail.com Fax: 91-461-2310275 <em>Manuscript received online 01 September 2018, accepted 09 October 2018</em> Synthesis of benzoin α-oxime and 2,6-pyridine dimethanol through eco-friendly method. These synthesized compounds are characterized by UV-Visible, FTIR and NMR spectral techniques. Anti-corrosion behaviour of benzoin α-oxime and 2,6-pyridi

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23

Samonte, Joseph L., and Michael T. Pope. "Derivatization of polyoxotungstates in aqueous solution. Exploration of the kinetic stability of cobalt(II)- and cobalt(III) derivatives of lacunary anions with pyridine and pyridine-type ligands." Canadian Journal of Chemistry 79, no. 5-6 (2001): 802–8. http://dx.doi.org/10.1139/v00-205.

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Four complexes of cobalt(II) with lacunary polyoxotungstate ligands, α-[PW11O39Co(H2O)]5-, α-[SiW11O39Co(H2O)]6-, α1-, and α2-[P2W17O61Co(H2O)]8- have been examined as potential precursors to substitutionally inert derivatized polytungstates that are stable in aqueous solution at near neutral pH. Replacement of the terminal water ligand by pyridine is readily achieved and the rates of exchange between bound and free pyridine were determined from NMR line widths at temperatures between 24 and 48°C. Oxidation to the aquacobalt(III) and pyridinecobalt(III) polytungstates occurs at potentials betw

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24

Bullen, Neil J., and John D. Kennedy. "Polyhedral Monocarbaborane Chemistry. Functionality and Isomerism: Reactions of the [6-Ph-nido-6-CB9H11]- Anion with Aminopyridines NC5H4NH2 to Yield Neutral arachno and closo Ten-Vertex Monocarbaborane Derivatives." Collection of Czechoslovak Chemical Communications 70, no. 11 (2005): 1873–90. http://dx.doi.org/10.1135/cccc20051873.

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Reaction of NC5H4-2-NH2 with the [6-Ph-nido-6-CB9H11]- anion (1) in the presence of hydrated FeCl3 gives [6-Ph-9-(NC5H4-2-NH2)-arachno-6-CB9H12] (4) and thence [1-Ph-2-(NC5H4-2-NH2)-closo-1-CB9H8] (5), in which the pyridine substituent is on a boron atom α to the cluster carbon atom. This behaviour contrasts to the reactions of organyl-substituted pyridines NC5H4R to yield neutral 9-pyridine arachno species [6-Ph-9-(NC5H4R)-arachno-6-CB9H12] and thence neutral 6-pyridine closo species [1-Ph-6-(NC5H4R)-closo-1-CB9H8], in which the pyridine substituent is on a boron atom β to the cluster carbon

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25

Kowollik, Wolfgang, and Wolfgang Voelter. "Notizen: Synthese und NMR-spektroskopische Eigenschaften von Benzyl-2,3-anhydro-4-desoxy-4-[N]-pyridinium-pyranosiden/Synthesis and NMR Spectroscopic Properties of Several Benzyl 2,3-Anhydro-4-deoxy-4-[N]-pyridinium Pyranosides." Zeitschrift für Naturforschung B 47, no. 4 (1992): 589–90. http://dx.doi.org/10.1515/znb-1992-0421.

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Benzyl 2,3-anhydro-4-0-triflyl-β-L-ribopyranoside (1) and benzyl 2,3-anhydro-4-O-triflyl-α-D-lyxopyranoside (3) react with pyridine to give benzyl 2,3-anhydro-4-deoxy-4-[N]-pyridinium - α-D-lyxopyranoside triflate (2) and benzyl 2,3-anhydro-4-deoxy-4-[N]-pyridinium -β-L-ribopyranoside triflate (4). Similar reactions with thiourea and dimethylsulfoxide are mentioned. Compound 2 is stable at room temperature, whereas compound 4 decomposes in a few hours (neighbouring group effect). The 13C NMR assignments of 2 are proved by 13C {1H} single frequency decoupling experiments.

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26

Céspedes-Guirao, Francisco J., Luis Martín-Gomis, Fernando Fernández-Lázaro, and Ángela Sastre-Santos. "Self-assembly of trinitrofluorenone derivatives with tetrasubstituted zinc phthalocyanines." Journal of Porphyrins and Phthalocyanines 13, no. 02 (2009): 266–74. http://dx.doi.org/10.1142/s108842460900036x.

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The synthesis and characterization of two novel tetrasubstituted zinc phthalocyanines bearing bulky alkylaryloxy substituents in the so-called peripheral (1) and non-peripheral (2) positions is reported. Due to the presence of these bulky substituents, the non-peripheral substituted ZnPc 2 can be isolated as a pure regioisomer just by column chromatography. This is the first case where an α,α,α,α-tetrasubstituted regioisomer is isolated by column chromatography. Moreover, we describe the supramolecular complexation of both Pcs with the new pyridine-substituted trinitrofluorenone derivative TNF

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27

Al-Ghorbani, Mohammed, Osama Alharbi, Abdel-Basit Al-Odayni та Naaser A. Y. Abduh. "Quinoline- and Isoindoline-Integrated Polycyclic Compounds as Antioxidant, and Antidiabetic Agents Targeting the Dual Inhibition of α-Glycosidase and α-Amylase Enzymes". Pharmaceuticals 16, № 9 (2023): 1222. http://dx.doi.org/10.3390/ph16091222.

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Novel analogs of quinoline and isoindoline containing various heterocycles, such as tetrazole, triazole, pyrazole, and pyridine, were synthesized and characterized using FT-IR, NMR, and mass spectroscopy, and their antioxidant and antidiabetic activities were investigated. The previously synthesized compound 1 was utilized in conjugation with ketone-bearing tetrazole and isoindoline-1,3-dione to synthesize Schiff’s bases 2 and 3. Furthermore, hydrazide 1 was treated with aryledines to provide pyrazoles 4a–c. Compound 5 was obtained by treating 1 with potassium thiocyanate, which was then cycli

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28

Jassbi, Amir R., Pahup Singh, Jyoti Lamba, Sonakshi Jain, Ian T. Baldwin, and Satoshi Tahara. "Transformation of Lapachol to a Novel Naphthoquinone and Related Compounds." Zeitschrift für Naturforschung B 61, no. 1 (2006): 73–77. http://dx.doi.org/10.1515/znb-2006-0115.

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In boiling pyridine, lapachol (1) is transformed into novel asymmetric naphthoquinone derivative, quadrilone (2), and into dehydro-α-lapachone (3), and adenophyllone (4). Lapachol used in the present study was isolated from the heartwood of Heterophragma quadriloculare and found to be the most abundant naphthoquinone.

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29

Zhang, Yu, Jing Sun, Guo-Liang Shen, and Chao-Guo Yan. "Selective synthesis of tetrahydroimidazo[1,2-a]pyridine and pyrrolidine derivatives via a one-pot two-step reaction." Organic & Biomolecular Chemistry 15, no. 38 (2017): 8072–77. http://dx.doi.org/10.1039/c7ob01860f.

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In the presence of triethylamine, the addition reaction of substituted α-amino acid alkyl esters with dialkyl but-2-ynedioate afforded active β-enamino esters, which in turn reacted with aromatic aldehydes and malononitrile to give tetrahydroimidazo[1,2-a]pyridine derivatives in moderate yields.

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30

Phillip, IG, and PJ Steel. "X-Ray Crystal Structures of 2,2'-Bis(pyrazol-1-yl)-4,4'-bipyridine and a Tetramethyl Derivative; New Bis-bidentate Binucleating Ligands." Australian Journal of Chemistry 48, no. 9 (1995): 1617. http://dx.doi.org/10.1071/ch9951617.

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X-Ray crystal structures of 2,2°-bis(pyrazol-1-yl)-4,4°-bipyridine (3) and 2,2°-bis(3,5-dimethyl-pyrazol-1-yl)-4,4°-bipyridine (4) have been determined at 130 K. Crystals of (3) are triclinic, Pī , a 8.061(1), b 9.024(1), c 10.680(1)Ǻ, α 102.032(8), β 107.931(6), γ 107.355(7)°, Z = 2; the structure was refined to a conventional R(I > 2σ(I)) = 0.0273. Crystals of (4) are orthorhombic, P 212121, a 7.077(2), b 13.906(4), c 16.697(5) Ǻ, Z = 4; the structure was refined to a conventional R(I > 2σ(I)) = 0.0386. In both molecules there is significant (33�1°) twisting about the central pyridine-

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31

Wang, Hong Sheng, and Hai Feng Suo. "Synthesis and Structure of a Two-Dimensional Metal-Organic Framework: [Fe(C₇H₃NO₄)(H₂O)₂]_n." Advanced Materials Research 790 (September 2013): 33–36. http://dx.doi.org/10.4028/www.scientific.net/amr.790.33.

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A two-dimensional coordination polymer [Fe (C7H3NO4)(H2O)2]n was prepared with pyridine-2,3,5-tricarboxylic acid (H3pta) and iron (II) perchlorate at hydrothermal condition. Pyridine-2,3,5-tricarboxylic acid was decomposed to form the organic ligand of pyridine-3,5-dicarboxylate anion appeared in 1. Its crystal structure was determined by single crystal X-ray diffraction. The complex belongs to monoclinic crystal system, C2/c space group with a = 0.9945(2) nm, b = 1.2067(3) nm, c = 0.74125(15) nm, α = γ = 90°, β = 105.859(3)°, V = 0.8557(3) nm3, Z = 4, D =1.995 Mg/ m3. The Fe (II) ion is five-

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32

Visampalli, Praneetha, та Girija Sastry Vedula. "Synthesis of Some New 7-(arylidene/heteroylidene imino)-2-(3,4-dimethoxy-phenyl)-5-oxo- 1,5-dihydro-[1,2,4]triazolo[1,5-α]pyridine-6-carbonitrile Derivatives as Potent Antibacterial and Anti-inflammatory Agents". INDIAN JOURNAL OF HETEROCYCLIC CHEMISTRY 33, № 03 (2023): 278. http://dx.doi.org/10.59467/ijhc.2023.33.278.

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A new series of 7-(arylidene/heteroylidene imino)-2-(3,4-dimethoxy-phenyl)-5-oxo-1,5-dihydro-[1,2,4] triazolo[1,5-α]pyridine-6-carbonitrile derivatives i.e., Schiff bases (4a-4j) was synthesized from reaction of 7-amino-2-(3,4-dimethoxy-phenyl)-5-oxo-1,5-dihydro-[1,2,4]triazolo[1,5-α]pyridine-6-carbonitrile (3) with substituted benzaldehydes or hetraldehydes in presence of glacial acetic acid. The antibacterial and anti-inflammatory properties of compounds 3, 4a-4j were investigated, and the results showed that some of the synthesized compounds had better activity than the standard reference d

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33

Visampalli, Praneetha, та Girija Sastry Vedula. "Synthesis of Some New 7-(arylidene/heteroylidene imino)-2-(3,4-dimethoxy-phenyl)-5-oxo- 1,5-dihydro-[1,2,4]triazolo[1,5-α]pyridine-6-carbonitrile Derivatives as Potent Antibacterial and Anti-inflammatory Agents". INDIAN JOURNAL OF HETEROCYCLIC CHEMISTRY 33, № 03 (2023): 277. http://dx.doi.org/10.59467/ijhc.2023.33.277.

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A new series of 7-(arylidene/heteroylidene imino)-2-(3,4-dimethoxy-phenyl)-5-oxo-1,5-dihydro-[1,2,4] triazolo[1,5-α]pyridine-6-carbonitrile derivatives i.e., Schiff bases (4a-4j) was synthesized from reaction of 7-amino-2-(3,4-dimethoxy-phenyl)-5-oxo-1,5-dihydro-[1,2,4]triazolo[1,5-α]pyridine-6-carbonitrile (3) with substituted benzaldehydes or hetraldehydes in presence of glacial acetic acid. The antibacterial and anti-inflammatory properties of compounds 3, 4a-4j were investigated, and the results showed that some of the synthesized compounds had better activity than the standard reference d

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34

Kriplani, Prashant, Pawan Swarnkar, Rinku Maheshwari, and K. G. Ojha. "Microwave Assisted Synthesis of Some Biologically Active Benzothiazolotriazine Derivatives." E-Journal of Chemistry 3, no. 4 (2006): 307–12. http://dx.doi.org/10.1155/2006/486723.

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Synthesis of some biologically active benzothiazolotriazine derivatives by microwave irradiation is reported. 2-Amino-6-substituted benzothiazoles1on treatment with benzaldehyde in anhydrous ethanol afforded 2-benzylidenoimino-6-substitutedbenzothiazoles2which underwent cyclisation with ammoniumthiocyanate in dioxane to give 2-phenyl benzothiazolo [3,2-α]-s-triazine-4-[3H] thiones3.These both steps were carried out in microwave. Compound3with benzoyl chloride in anhydrous pyridine gave 2-phenyl-3-(benzoyl) benzothiazolo [3,2-α]-s-triazine-4-thiones4in good yields. The structure of all these co

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35

Dugheri, Stefano, Niccolò Fanfani, Giovanni Cappelli, et al. "Regarding Bioanalysis Lasting a Few Minutes: Automated Cooling-SPME and Fast-GC for Urinary 2-Phenyl-2-Propanol Monitoring." Toxics 12, no. 10 (2024): 743. http://dx.doi.org/10.3390/toxics12100743.

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An innovative SPME head space GC–MS method, in cooling mode, using a fully automated routine, was developed to detect 2-phenyl-2-propanol, a representative urinary metabolite of cumene. Following an acid hydrolysis and derivatization step with lowered quantities of reagents, acetic anhydride and pyridine, a 30 μm polydimethylsiloxane SPME fiber was used to sample derivatized 2-phenyl-2-propanol, such as benzenemethanol,α,α-dimethyl-acetate, from the headspace. Performances of the method, optimized through experimental design, provide an LOD of 0.034 mg/L and an LOQ 0.10 mg/L, with a short samp

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36

Zeid, Ibrahim F., and Adel A. H. Abdel-Rahman. "Synthesis of 2-O-Ethyl Analogues of 5′-Azido- and 5′-Amino-2’,5′-dideoxyuridines as New Antiviral Agents." Journal of Chemical Research 23, no. 3 (1999): 192–93. http://dx.doi.org/10.1177/174751989902300311.

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2- O-Ethyluracil derivatives 3a-d have been silylated with HMDS and condensed in the presence of TMS-triflate with a 5-azido sugar to give the corresponding β-nucleosides 5a-d and their α-anomers 6a-d; deprotection afforded 7 and 8, and the 5′-amino derivatives 9a,b could be obtained by treatment of the corresponding 5′-azido nucleosides with triphenylphosphine in pyridine.

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37

Demchenko, Sergii, Sergii Yarmoluk, Volodymyr Sukhovieiev, Oleksandr Golovchenko, Oleksandr Sukhovieiev, and Anatolii Demchenko. "Syntheses and evaluation of novel 3-hydroxy-1,3-diaryl-2,3,5,6,7,8-hexahydro-imidazo[1,2-a]pyridine-1-ium bromides as potential anticancer agents." Pharmacia 71 (November 27, 2024): 1–10. https://doi.org/10.3897/pharmacia.71.e135992.

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New 3-hydroxy-1,3-diaryl-2,3,5,6,7,8-hexahydro-imidazo[1,2-a]pyridine-1-ium bromides have been designed, synthesized, and characterized by 1Н NMR, 13C NMR, and LCMS. The cyclic structure of the condensation products of aryl-(3,4,5,6-tetahydropyridin-2-yl)amines with α-bromoketones has been proven. It has been shown that heating 3-hydroxy-1,3-bis-(41-methoxyphenyl)-2,3,5,6,7,8-hexahydro-imidazo[1,2-a]pyridine-1-ium bromide in acetic anhydride accompanied by elimination of water to form 1,3-bis-(41-methoxyphenyl)-5,6,7,8-tetrahydro-imidazo[1,2-a]pyridine-1-ium bromide. Antitumor activity of 1,3-

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38

Demchenko, Sergii, Sergii Yarmoluk, Volodymyr Sukhovieiev, Oleksandr Golovchenko, Oleksandr Sukhovieiev, and Anatolii Demchenko. "Syntheses and evaluation of novel 3-hydroxy-1,3-diaryl-2,3,5,6,7,8-hexahydro-imidazo[1,2-a]pyridine-1-ium bromides as potential anticancer agents." Pharmacia 71 (November 27, 2024): 1–10. http://dx.doi.org/10.3897/pharmacia.71.e135992.

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New 3-hydroxy-1,3-diaryl-2,3,5,6,7,8-hexahydro-imidazo[1,2-a]pyridine-1-ium bromides have been designed, synthesized, and characterized by 1Н NMR, 13C NMR, and LCMS. The cyclic structure of the condensation products of aryl-(3,4,5,6-tetahydropyridin-2-yl)amines with α-bromoketones has been proven. It has been shown that heating 3-hydroxy-1,3-bis-(41-methoxyphenyl)-2,3,5,6,7,8-hexahydro-imidazo[1,2-a]pyridine-1-ium bromide in acetic anhydride accompanied by elimination of water to form 1,3-bis-(41-methoxyphenyl)-5,6,7,8-tetrahydro-imidazo[1,2-a]pyridine-1-ium bromide. Antitumor activity of 1,3-

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39

Seitz, Gunther, та Jens Lachmann. "Synthese neuer Pyridin-, Pyrindin- bzw. Isochinolin-substituierter α- und β-C-Nukleoside der 2-Desoxy-D-ribose / Synthesis of Novel Pyridine-, Pyrindine- and Isoquinoline-Substituted α- and β-C-Nucleosides of 2-Deoxy-D-ribose". Zeitschrift für Naturforschung B 54, № 4 (1999): 549–58. http://dx.doi.org/10.1515/znb-1999-0420.

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The novel imido esters of 2-deoxy-α- and -β-D-ribose 8 and 9 have been synthesized and successfully transformed to the protected 1,2,4-triazine-C -nucleosides 11 and 12 using an inverse type Diels-Alder reaction with the 1,2,4,5-tetrazine 10. The electron deficient diazadiene system of both C -nucleosides 11 and 12 proved to be highly reactive in a consecutive [4 + 2] cycloaddition with inverse electron demand towards several electron rich dienophiles yielding after successful deprotection the novel pyridine-, pyrindine- and isoquinoline-C-nucleosides 15, 18 and 21 of 2 -deoxy-α-D-ribose and 2

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40

Dufour, Pascal, Yves Dartiguenave, Michèle Dartiguenave, et al. "Crystal structures of 7-azaindole, an unusual hydrogen-bonded tetramer, and of two of its methylmercury(II) complexes." Canadian Journal of Chemistry 68, no. 1 (1990): 193–201. http://dx.doi.org/10.1139/v90-025.

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Crystals of 7-azaindole ([Formula: see text], a = 11.312(4), b = 14.960(6), c = 15.509(5) Å, α = 102.86(3), β = 108.78(3), γ = 90.71(3)°, Z = 16, R = 0.052) contain tetrameric units of approximate S4 symmetry, in which the molecules are associated by means of four complementary N—H … N hydrogen bonds. [CH3Hg(7-azaindole)]NO3 ([Formula: see text], a = 7.818(3), b = 7.884(3), c = 9.135(4) Å, α = 97.89(3), β = 109.13(3), γ = 103.28(3)°, Z = 2, R = 0.039) contains well-separated nitrate ions and complex cations in which the methylmercury group is linearly bonded to the pyridine nitrogen atom, wher

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41

Yu, S. "CH+·2 transfer to pyridine nucleophiles: a means of producing α-distonic ions". Journal of the American Society for Mass Spectrometry 4, № 2 (1993): 117–24. http://dx.doi.org/10.1016/1044-0305(93)85067-8.

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42

SAUTER, F., P. STANETTY, J. SCHULNER, W. SITTENTHALER та U. JORDIS. "ChemInform Abstract: Fungicidal Pyridine Derivatives. Part 2. Derivates of α- Trichloromethyl-3-pyridinemethanol." ChemInform 23, № 8 (2010): no. http://dx.doi.org/10.1002/chin.199208221.

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43

Yu, Shi-Wei, Zhong-Hao Li, Miao-Xin Li та ін. "A Novel 2-Methylimidazole Promoted Oxyacyloxylation of α-Hydroxy Ketones and Anhydrides: An Easy Access to α-Acyloxy Ketones". Catalysts 14, № 11 (2024): 811. http://dx.doi.org/10.3390/catal14110811.

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An efficient and operationally simple method for the synthesis of α-acyloxy ketones through the readily available 2-methylimidazole-promoted reaction of α-hydroxy ketones and anhydrides is developed. In the reaction, the anhydrides act as both a substrate and a solvent. The new method features good substrate tolerance, mild reaction conditions, readily accessible starting materials, and excellent yields, providing facile and green access to the targets. Importantly, the reaction also avoids the use of reagents with pungent odors, such as pyridine, in traditional esterification, which may promo

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44

Heineking, N., H. Dreizler, K. Endo, and Y. Kamura. "High Resolution Microwave Spectra of Pyridine-N-oxideanda-Picoline-N-oxide." Zeitschrift für Naturforschung A 44, no. 12 (1989): 1196–200. http://dx.doi.org/10.1515/zna-1989-1212.

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Abstract The rotational spectra of pyridine-N-oxide and x-picoline-N-oxide ( = 2-methvlpyridine-N-oxide) have been observed by means of pulsed microwave spectroscopy. For both molecules, the 14N quadrupole coupling constants have been obtained. For α-picoline-N-oxide. in addition the parameters of the internal rotation motion and the centrifugal distortion constants have been determined.

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45

Engelhardt, LM, PC Healy, JD Kildea, and AH White. "Lewis-Base Adducts of Group 11 Metal(I) Compounds. LI. Synthesis and Structural Characterization of Mononuclear Chloro-, Bromo- and Iodo-pyridinebis(triphenylphosphine)copper(I) Complexes." Australian Journal of Chemistry 42, no. 6 (1989): 895. http://dx.doi.org/10.1071/ch9890895.

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Complexes [ XCu ( py )(PPh3)2], X = Cl, Br, I, py = pyridine, have been synthesized and characterized by single-crystal X-ray structure determination. Chloride and iodide derivatives have similar cells [ isomorphous (?) but not isostructural ], triclinic, pi, a = 19.5 A, b = 10.5, c = 9.6 � , α ≈ 66, β ≈ 86, γ ≈ 83�, Z = 2; the bromide is monoclinic, Cc, a 13.568(9), b 15.760(12), c 16.545(8) � , β 95.65(5)�, Z = 4. Cl, Br, I structures were refined to residuals of 0.042, 0.055, 0.039 for 4288, 2241, 4808 'observed' reflections. In all cases, the copper atom is four-coordinate; for such an arr

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46

Saini, Mukesh Kumar, Rakesh Gupta, Surendra Singh, and Firasat Hussain. "Synthesis, crystal structure and catalytic activity of the guanidinium cation directed nickel(ii)-containing open Wells–Dawson 19-tungstodiarsenate(iii) [{Ni(H2O)4}2{Na(H2O)}As2W19O67(H2O)]9−." RSC Advances 5, no. 32 (2015): 25273–78. http://dx.doi.org/10.1039/c5ra01426c.

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Guanidinium directed open Wells–Dawson type [{Ni(H<sub>2</sub>O)<sub>4</sub>}<sub>2</sub>{Na(H<sub>2</sub>O)}As<sub>2</sub>W<sub>19</sub>O<sub>67</sub>(H<sub>2</sub>O)]<sup>9−</sup> polyanion 1 has been synthesized on reacting nickel chloride and trilacunary Na<sub>9</sub>[B-α-AsW<sub>9</sub>O<sub>33</sub>] in aqueous solution (pH ∼ 5.8), in presence of pyridine-2,6-dicarboxylic acid.

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47

Cook, IB. "Caveat Regarding the Use of Substituent Parameters in Statistical Analyses of Molecular Properties. II. Case Study : 13 N.M.R. of 2-Substituted Pyridines and Monosubstituted Benzenes." Australian Journal of Chemistry 42, no. 9 (1989): 1493. http://dx.doi.org/10.1071/ch9891493.

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Carbon-13 n.m.r. substituent chemical shifts of equivalent positions on monosubstituted benzenes and 2-substituted pyridines are analysed by multiple linear regression on combinations of a field, resonance, electronegativity and three polarizability parameters. The ortho and meta positions of the 2-pyridine and benzene series are poorly described by σF and σR parameters, but a much improved fit is obtained when σx and/or a bond polarizability parameter σ α,(C-X) are included. The mechanism of shift formation differs markedly between the two systems when the C2, C4 and C6 positions on pyridine

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48

Yadav, Ram Nath Prasad. "Synthesis, characterisation and reactions of cationic complexes of Arylantimony (III) chlorides ArnSbCl3-n with perchlorate and tetrafluoroborate anions." International Journal of Applied Sciences and Biotechnology 1, no. 2 (2013): 42–48. http://dx.doi.org/10.3126/ijasbt.v1i2.8204.

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Several hitherto unreported cationic complexes of the general formula [Ar2SbL][Y] and [ArSbL2][Y]2 [ Where, Ar = C6H5, L = α-Picoline, Pyridine, Ph3AsO, hexamethyl phosphoramide (HMPA), thiourea (TU) and Y = ClO4− BF4− ] have been synthesized and characterized by solid state IR, 1H NMR, elemental analysis, conductance and molecular weight measurements. The physico-chemical data, cations [Ar2SbL]+1 and[ArSbL2]+2 are assigned a pyramidal structure.DOI: http://dx.doi.org/10.3126/ijasbt.v1i2.8204 Int J Appl Sci Biotechnol, Vol. 1(2): 42-49

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49

Oestreich, Martin, Dou Hong, Wenbin Mao, and Elisabeth Irran. "Enantioselective, Copper-Catalyzed Addition of Nucleophilic Silicon to Alkenyl-Substituted Phosphine Oxides." Synthesis 54, no. 08 (2021): 2049–56. http://dx.doi.org/10.1055/a-1701-7500.

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AbstractAn enantioselective β-silylation of α,β-unsaturated phosphine oxide derivatives using a silylboronic ester as the silicon pronucleophile is reported. The reaction is catalyzed by copper salts in the presence of chiral pyridine–oxazoline (PyOx) ligands. Good to high enantioselectivities (≤95% ee) are obtained for β-aryl-substituted acceptors whereas alkyl residues in the β-position led to a lower ee value for 1° and no reaction for 2° and 3°. The new method represents another way of accessing α-chiral silanes and complements the known β-borylation.

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50

Bakar, Bazri Izwan, Mohammad Murwih Alidmat, Melati Khairuddean, and Tutik Dwi Wahyuningsih. "Molecular Docking Study, Synthesis and Characterization of New Hybrid Anthracene-Thiophene Compounds with Chalcone and Pyridine Scaffolds." Materials Science Forum 1068 (August 19, 2022): 175–81. http://dx.doi.org/10.4028/p-4qs845.

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Breast cancer is a major health problem with an increasing number of cases over the years. Few classes of anticancer agents have been developed, but they established toxic effects on normal cells. In this study, a new hybrid anthracene-thiophene chalcone 1 has been synthesized via a Claisen-Schmidt condensation of substituted anthracene aldehyde and a thiophene ketone. The cyclo-condensation reaction of chalcone 1 formed a new anthracene-thiophene pyridine 2. The synthesized compounds were structurally characterized by Fourier Transform Infrared (FT-IR) and Nuclear Magnetic Resonance (NMR) spe

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