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Journal articles on the topic 'Pyridin-4-amine'

Author: Grafiati

Published: 7 June 2025

Last updated: 16 July 2025

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1

A. Ibrahim, Ammar, Maher A. Ibrahim, Entesar A. Sulliman, Simaa M. Daood, and Ghasan Q. Ismael. "Comparison Study of HOMO-LUMO Energy Gaps for Tautomerism of Triazoles in Different Solvents Using Theoretical Calculations." NTU Journal of Pure Sciences 1, no. 1 (2021): 38–43. http://dx.doi.org/10.56286/ntujps.v1i1.149.

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The phenomena of the tautomerism forms of the substituted triazoles compounds which are named [1-A] (5-phenyl-1H-1,2,4-triazol-3-amine), [1-B] (3-phenyl-1H-1,2,4-triazol-5-amine), [2-A] (5-(pyridin-2-yl)-1H-1,2,4-triazol-3-amine), [2-B] (3-(pyridin-2-yl)-1H-1,2,4-triazol-5-amine), [3-A] (5-(pyridin-3-yl)-1H-1,2,4-triazol-3-amine), [3-B] (3-(pyridin-3-yl)-1H-1,2,4-triazol-5-amine), [4-A] (5-(pyridin-4-yl)-1H-1,2,4-triazol-3-amine) and [4-B] (3-(pyridin-4-yl)-1H-1,2,4-triazol-5-amine) have been evaluated by Hartree-Fock (HF) method at the basis set (6-31G) in the both gas phase and at different

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2

Chen, Min-Min, Liang Chen, Hong-Xi Li, Lee Brammer, and Jian-Ping Lang. "Highly selective detection of Hg2+ and MeHgI by di-pyridin-2-yl-[4-(2-pyridin-4-yl-vinyl)-phenyl]-amine and its zinc coordination polymer." Inorganic Chemistry Frontiers 3, no. 10 (2016): 1297–305. http://dx.doi.org/10.1039/c6qi00160b.

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3

Mallikarjunaswamy, C., D. G. Bhadregowda, and L. Mallesha. "Synthesis and Antimicrobial Activity of Pyrimidine Salts with Chloranilic and Picric Acids." Journal of Chemistry 2013 (2013): 1–5. http://dx.doi.org/10.1155/2013/727182.

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Pyrimidine salts such as 2-methyl-5-nitro-phenyl-(4-pyridin-3-yl-pyrimidin-2-yl)-amine (1) and 4-methyl-3-(4-pyridin-3-yl-pyrimidin-2-yl-amino)-phenyl-amine (2) with chloranilic and picric acids were synthesized, and theirin vitroantibacterial and antifungal activities were evaluated. The synthesized compounds were characterized by elemental analyses, UV-visible, FT-IR, and1H NMR spectral studies. Compound2aexhibited good inhibition towards antimicrobial activity compared to the other compounds.

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4

Bussey, Katherine A., Annie R. Cavalier, Jennifer R. Connell, et al. "Structural studies of (prop-2-en-1-yl)bis[(pyridin-2-yl)methylidene]amine hetero-scorpionate copper complexes." Acta Crystallographica Section C Structural Chemistry 71, no. 7 (2015): 526–33. http://dx.doi.org/10.1107/s2053229615010335.

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The structures of five compounds consisting of (prop-2-en-1-yl)bis[(pyridin-2-yl)methylidene]amine complexed with copper in both the CuIand CuIIoxidation states are presented, namely chlorido{(prop-2-en-1-yl)bis[(pyridin-2-yl)methylidene]amine-κ3N,N′,N′′}copper(I) 0.18-hydrate, [CuCl(C15H17N3)]·0.18H2O, (1),catena-poly[[copper(I)-μ2-(prop-2-en-1-yl)bis[(pyridin-2-yl)methylidene]amine-κ5N,N′,N′′:C2,C3] perchlorate acetonitrile monosolvate], {[Cu(C15H17N3)]ClO4·CH3CN}n, (2), dichlorido{(prop-2-en-1-yl)bis[(pyridin-2-yl)methylidene]amine-κ3N,N′,N′′}copper(II) dichloromethane monosolvate, [CuCl2(C

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5

Reddy, B. Siva, and K. R. S. Prasad. "Design, Synthesis and Antibacterial Activity of N-(3-((4-(6-(2,2,2- Trifluoroethoxy)pyridin-3-yl)-1H-imidazol-2-yl)methyl)oxetan-3-yl)amide Derivatives." Asian Journal of Chemistry 33, no. 3 (2021): 577–82. http://dx.doi.org/10.14233/ajchem.2021.23039.

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A new series of N-(3-((4-(6-(2,2,2-trifluoroethoxy)pyridin-3-yl)-1H-imidazol-2-yl)methyl)oxetan-3- yl)amide derivatives (10a-h)were synthesized by the reaction of 3-((4-(6-(2,2,2-trifluoroethoxy)pyridin- 3-yl)-1H-imidazol-2-yl)methyl)oxetan-3-amine (8) with various carboxylic acids in the presence of T3P catalyst. The reaction is usually furnished within 60 min with good isolated yields. Coupling of 6-(2,2,2-trifluoroethoxy) nicotinic acid (1) with Weinreb amine hydrochloride gave N-methoxy-Nmethyl- 6-(2,2,2-trifluoroethoxy) nicotinamide (2). Compound 3 was synthesized by the Grignard reaction

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6

Böck, Denise, Andreas Beuchel, Richard Goddard, Adrian Richter, Peter Imming, and Rüdiger W. Seidel. "Protonation sites and hydrogen bonding in mono-hydrobromide salts of two N,4-diheteroaryl 2-aminothiazoles." Structural Chemistry 32, no. 3 (2021): 989–96. http://dx.doi.org/10.1007/s11224-021-01730-0.

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AbstractThe synthesis and structural characterization of N-(6-methoxypyridin-3-yl)-4-(pyridin-2-yl)thiazol-2-amine mono-hydrobromide monohydrate (3) and N-(6-methoxypyridin-3-yl)-4-(pyrazin-2-yl)thiazol-2-amine mono-hydrobromide 0.35 methanol solvate (4) are reported. The crystal structures of 3 (monoclinic, space group P21/n, Z = 4) and 4 (monoclinic, space group, C2/c, Z = 8) feature N,4-diheteroaryl 2-aminothiazoles showing similar molecular conformations but different sites of protonation and thus distinctly different intermolecular hydrogen bonding patterns. In 3, Namine–H⋯Br−, N+pyridine

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7

Unjaroen, Duenpen, Johann B. Kasper, and W. R. Browne. "Reversible photochromic switching in a Ru(ii) polypyridyl complex." Dalton Trans. 43, no. 45 (2014): 16974–76. http://dx.doi.org/10.1039/c4dt02430c.

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Fully reversible photoswitching of the coordination mode of the ligand MeN<sub>4</sub>Py (1,1-di(pyridin-2-yl)-N,N′-bis(pyridin-2-yl-methyl)-ethan-1-amine) in its ruthenium(ii) complex with visible light is reported.

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8

Yang, Xifeng, Feng Li, and Weiwei Zhang. "4-(Pyridin-4-yl)thiazol-2-amine as an efficient non-toxic inhibitor for mild steel in hydrochloric acid solutions." RSC Advances 9, no. 19 (2019): 10454–64. http://dx.doi.org/10.1039/c8ra09618j.

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9

Fairuz, Zainal Abidin, Zaharah Aiyub, Zanariah Abdullah, Seik Weng Ng, and Edward R. T. Tiekink. "4-Methyl-N-(3-methylphenyl)pyridin-2-amine." Acta Crystallographica Section E Structure Reports Online 67, no. 11 (2011): o3078. http://dx.doi.org/10.1107/s1600536811044059.

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10

Fang, Rui-Qin, Huan-Qiu Li, Lei Shi, Zhu-Ping Xiao, and Hai-Liang Zhu. "N-[Methoxy(4-nitrophenyl)methyl]pyridin-2-amine." Acta Crystallographica Section E Structure Reports Online 63, no. 10 (2007): o3975. http://dx.doi.org/10.1107/s160053680704247x.

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11

Adeleke, Adesola A., and Bernard Omondi. "Crystal Structure of a Chiral Sec-Amine, 4-Chloro-N-(1-(pyridin-2-yl)ethyl)aniline." Molbank 2022, no. 1 (2022): M1335. http://dx.doi.org/10.3390/m1335.

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In this communication, we present the crystal structure of a secondary amine: 4-chloro-N-(1-(pyridin-2-yl)ethyl)aniline (Lb) obtained from a stepwise reduction of an imine, (E)-N-(4-chlorophenyl)-1-(pyridin-2-yl)ethan-1-imine (La) with sodium borohydride. The structure was characterized by FT-IR, 1H and 13C NMR, Mass Spectroscopy and X-ray diffraction.

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12

Deady, LW, and WL Finlayson. "An Intramolecular Rearrangement in the Acetylation of Pyridin-4-amine." Australian Journal of Chemistry 38, no. 3 (1985): 429. http://dx.doi.org/10.1071/ch9850429.

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The surprisingly rapid formation of 4-( acetylamino )pyridine from reaction of pyridin-4-amine with various acetylating agents seems explicable by a mechanism which involves rate-determining intramolecular rearrangement of a first-formed ring N-acetyl intermediate.

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13

Merugu, Srinivas Reddy, Sigrid Selmer-Olsen, Camilla Johansen Kaada, Eirik Sundby, and Bård Helge Hoff. "Synthetic Routes to 2-aryl-1H-pyrrolo[2,3-b]pyridin-4-amines: Cross-Coupling and Challenges in SEM-Deprotection." Molecules 29, no. 19 (2024): 4743. http://dx.doi.org/10.3390/molecules29194743.

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7-Azaindoles are compounds of considerable medicinal interest. During development of the structure–activity relationship for inhibitors of the colony stimulated factor 1 receptor tyrosine kinase (CSF1R), a specific 2-aryl-1H-pyrrolo[2,3-b]pyridin-4-amine was needed. Two different synthetic strategies were evaluated, in which the order of the key C-C and C-N cross-coupling steps differed. The best route relied on a chemoselective Suzuki–Miyaura cross-coupling at C-2 on a 2-iodo-4-chloropyrrolopyridine intermediate, and subsequently a Buchwald–Hartwig amination with a secondary amine at C-4. Mas

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14

Abu Thaher, Bassam, Pierre Koch, Dieter Schollmeyer, and Stefan Laufer. "4-(4-Fluorophenyl)-1-phenyl-3-(pyridin-4-yl)-1H-pyrazol-5-amine." Acta Crystallographica Section E Structure Reports Online 68, no. 3 (2012): o632. http://dx.doi.org/10.1107/s1600536812004096.

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15

Guo, Huixia, Xiaohua Xi, Renxiang Yan та Xiaoquan Lu. "Theoretical study on the effect of different π-linker on the performance of sensitizer in carbazole-based dyes". Journal of Theoretical and Computational Chemistry 17, № 02 (2018): 1850019. http://dx.doi.org/10.1142/s0219633618500190.

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Derived from diarylamine sensitizer diphenyl-(7-pyridin-4-yl-9H-carbazol-2-yl)-amine (N13), a series of novel D[Formula: see text]A carbazole-based organic dye sensitizers with different [Formula: see text]-linkers were designed for searching more effective sensitizers in dye-sensitized solar cells (DSSCs) design. Optimized geometries, electronic structure, and other parameters, which can evaluate the performance of DSSCs effectively and intuitively, were theoretically calculated by density functional theory (DFT) and time-dependent DFT methods at the M06/6-31G(d,p) level. The results indicate

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16

Abu Thaher, Bassam, Pierre Koch, Dieter Schollmeyer, and Stefan Laufer. "4-(4-Fluorophenyl)-1-(4-nitrophenyl)-3-(pyridin-4-yl)-1H-pyrazol-5-amine." Acta Crystallographica Section E Structure Reports Online 68, no. 3 (2012): o633. http://dx.doi.org/10.1107/s1600536812004102.

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17

Dhanalakshmi, G., Mala Ramanjaneyulu, Sathiah Thennarasu, and S. Aravindhan. "Crystal structure and Hirshfeld surface analysis of two imidazo[1,2-a]pyridine derivatives: N-tert-butyl-2-(4-methoxyphenyl)-5-methylimidazo[1,2-a]pyridin-3-amine and N-tert-butyl-2-[4-(dimethylamino)phenyl]imidazo[1,2-a]pyridin-3-amine." Acta Crystallographica Section E Crystallographic Communications 74, no. 12 (2018): 1913–18. http://dx.doi.org/10.1107/s2056989018016651.

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In the title imidazo[1,2-a]pyridine derivatives, N-tert-butyl-2-(4-methoxyphenyl)-5-methylimidazo[1,2-a]pyridin-3-amine, C19H23N3O, (I), and N-tert-butyl-2-[4-(dimethylamino)phenyl]imidazo[1,2-a]pyridin-3-amine, C19H24N4, (II), the 4-methoxyphenyl ring in (I) and the 4-(dimethylamino)phenyl ring in (II) are inclined to the respective imidazole rings by 26.69 (9) and 31.35 (10)°. In the crystal of (I), molecules are linked by N—H...N hydrogen bonds, forming chains propagating along the [001] direction. The chains are linked by C—H...π interactions, forming layers parallel to the (010) plane. In

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18

Abu Thaher, Bassam, Pierre Koch, Dieter Schollmeyer, and Stefan Laufer. "4-(4-Fluorophenyl)-3-(pyridin-4-yl)-1-(2,4,6-trichlorophenyl)-1H-pyrazol-5-amine." Acta Crystallographica Section E Structure Reports Online 68, no. 9 (2012): o2603. http://dx.doi.org/10.1107/s1600536812033569.

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19

Kumar, G. Santosh, S. Pushpa Ragini, A. Sanjeeva Kumar, and H. M. Meshram. "A copper-catalyzed multi-component reaction accessing fused imidazo-heterocycles via C–H functionalization." RSC Advances 5, no. 64 (2015): 51576–80. http://dx.doi.org/10.1039/c5ra09025c.

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An efficient synthesis of fused imidazo-heterocycles is described using Cu(OTf)<sub>2</sub> in [bmim]BF<sub>4</sub> by the multi-component reaction of pyridin-2(1H)-one or thiazol/benzo[d]thiazol-2(3H)-ones with O-tosylhydroxyl amine and acetophenones under microwave irradiation.

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20

Cibulka, Radek, František Liška, and Jiří Ludvík. "Electrochemical Reductions of Methyl Azinyl Ketoximes on Mercury." Collection of Czechoslovak Chemical Communications 65, no. 10 (2000): 1630–42. http://dx.doi.org/10.1135/cccc20001630.

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Electroreductions of hydroxyimino group of methyl hetaryl (pyridin-2-yl, pyridazin-3-yl, pyrimidin-2-yl, pyrimidin-4-yl, pyrazinyl) ketoximes on mercury electrodes were studied using dc polarography, coulometry and preparative electrolysis. Depending on pH, double- protonated, single-protonated and neutral forms of the ketoximes are transformed in a four-electron reduction to the corresponding amine. The second nitrogen in the diazine ketoximes facilitates reduction of the oxime group in comparison with methyl pyridin-2-yl ketoxime. Reducibility of the oximes correlates with the enhancement of

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21

Kansagara, N. N., V. R. Dangar, and V. R. Shah. "Synthesis, Characterization and Antimicrobial Evaluation of Schiff’s Base and Aryl Aminomethyl Derivatives." International Letters of Chemistry, Physics and Astronomy 64 (February 2016): 89–94. http://dx.doi.org/10.18052/www.scipress.com/ilcpa.64.89.

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Schiff’s bases are obtained on heating an aldehydes with aromatic amine in presence of glacial acetic acid. These are the compounds containing characteristic –HC=N– group. Aryl amino methyl derivatives of heterocyclic compounds to synthesize by selective reduction of schiff’s bases (imine group) with sodiumborohydride in controlled experimental condition. Schiff’s base of N-Aryl-1-[6-methyl-2-(4-methylphenyl)imidazo[1,2-a]pyridin-3-yl]methanimines & Aryl amines of N-Aryl-1-[6-methyl-2-(4-methylphenyl)imidazo[1,2-a]pyridin-3-yl]methanamines were prepared. Their chemical structures were conf

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22

Kansagara, N. N., V. R. Dangar, and V. R. Shah. "Synthesis, Characterization and Antimicrobial Evaluation of Schiff’s Base and Aryl Aminomethyl Derivatives." International Letters of Chemistry, Physics and Astronomy 64 (February 15, 2016): 89–94. http://dx.doi.org/10.56431/p-5z8xff.

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Schiff’s bases are obtained on heating an aldehydes with aromatic amine in presence of glacial acetic acid. These are the compounds containing characteristic –HC=N– group. Aryl amino methyl derivatives of heterocyclic compounds to synthesize by selective reduction of schiff’s bases (imine group) with sodiumborohydride in controlled experimental condition. Schiff’s base of N-Aryl-1-[6-methyl-2-(4-methylphenyl)imidazo[1,2-a]pyridin-3-yl]methanimines & Aryl amines of N-Aryl-1-[6-methyl-2-(4-methylphenyl)imidazo[1,2-a]pyridin-3-yl]methanamines were prepared. Their chemical structures were conf

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23

Padilha, Diego da S., Adailton J. Bortoluzzi, and Marciela Scarpellini. "An unusual partial occupancy of labile chloride and aqua ligands in cocrystallized isomers of a nickel(II) complex bearing a tripodal N 4-donor ligand." Acta Crystallographica Section C Structural Chemistry 76, no. 1 (2020): 17–22. http://dx.doi.org/10.1107/s2053229619015705.

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A novel Ni2+ complex with the N 4-donor tripodal ligand bis[(1-methyl-1H-imidazol-2-yl)methyl][2-(pyridin-2-yl)ethyl]amine (L), namely, aqua{bis[(1-methyl-1H-imidazol-2-yl-κN 3)methyl][2-(pyridin-2-yl-κN)ethyl]amine-κN}chloridonickel(II) perchlorate, [NiCl(C17H22N6)(H2O)]ClO4 or [NiCl(H2O)(L)Cl]ClO4 (1), was synthesized and characterized by spectroscopic and spectrometric methods. The crystal structure of 1 reveals an interesting and unusual cocrystallization of isomeric complexes, which are crystallographically disordered with partial occupancy of the labile cis aqua and chloride ligands. The

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24

Wu, Xiang-Wen, Shi Yin, Wan-Fu Wu, and Jian-Ping Ma. "Synthesis and characterization of two novel bimetallic macrocyclic complexes generated from 1,2,4-triazole-containing semi-rigid ligands andM(NO3)2units (M= Ni and Zn)." Acta Crystallographica Section C Structural Chemistry 72, no. 4 (2016): 285–90. http://dx.doi.org/10.1107/s205322961600348x.

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Bimetallic macrocyclic complexes have attracted the attention of chemists and various organic ligands have been used as molecular building blocks, but supramolecular complexes based on semi-rigid organic ligands containing 1,2,4-triazole have remained rare until recently. It is easier to obtain novel topologies by making use of asymmetric semi-rigid ligands in the self-assembly process than by making use of rigid ligands. A new semi-rigid ligand, 3-[(pyridin-4-ylmethyl)sulfanyl]-5-(quinolin-2-yl)-4H-1,2,4-triazol-4-amine (L), has been synthesized and used to generate two novel bimetallic macro

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25

Liang, Guang-Ming, Jing Shang, Kun-Guo Yang, Kai Ma, and Qing-Ling Ni. "Counter-anion role in the formation of two supramolecular complexes: [Ag2(DPP)2](ClO4)2·CH3CN and [Ag2(DPP)2(NO3)2] {DPP isN-[(diphenylphosphanyl)methyl]pyridin-4-amine}." Acta Crystallographica Section C Structural Chemistry 70, no. 4 (2014): 379–83. http://dx.doi.org/10.1107/s2053229614005725.

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The title compounds, bis{μ-N-[(diphenylphosphanyl)methyl]pyridin-4-amine-κ2N1:P}disilver bis(perchlorate) acetonitrile monosolvate, [Ag2(C18H17N2P)2](ClO4)2·CH3CN, (1), and bis{μ-N-[(diphenylphosphanyl)methyl]pyridin-4-amine-κ2N1:P}bis[(nitrato-κ2O,O)silver], [Ag2(C18H17N2P)2(NO3)2], (2), each contain disilver macrocyclic [Ag2(C18H17N2P)2]2+cations lying about inversion centres. The cations are constructed by twoN-[(diphenylphosphanyl)methyl]pyridin-4-amine (DPP) ligands linking two Ag+cations in a head-to-tail fashion. In (1), the unique Ag+cation has a near-linear coordination geometry consi

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26

Qi, Yan, Yang Li, Zheng-Ping Ma та Qiu-Yun Chen. "[(4-Methylbenzyl)bis(pyridin-2-ylmethyl)amine-κ3N,N′,N′′]bis(thiocyanato-κS)copper(II) dichloromethane hemisolvate". Acta Crystallographica Section E Structure Reports Online 68, № 4 (2012): m468. http://dx.doi.org/10.1107/s1600536812011476.

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The title compound, [Cu(NCS)2(C20H21N3)]·0.5CH2Cl2, crystallized with two independent complex molecules (AandB) in the asymmetric unit, accompanied by one dichloromethane solvent molecule. Each CuIIatom has a square-pyramidal geometry, being coordinated by five N atoms, three from the (4-methylbenzyl)bis(pyridin-2-ylmethyl)amine ligand and two from the thiocyanate ligands. In the crystal, theBmolecules are linkedviaC—H...S interactions, forming chains propagating along [100].

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27

Cao, Lei, Le Zhou, Guo-Hui Kang, Chuan-Sheng Ruan, and Bao-Ming Ji. "Crystal structure of tris(4-(pyridin-4-yl)phenyl)amine, dihydrate, (C33H24N4)·2(H2O), C33H28N4O2." Zeitschrift für Kristallographie - New Crystal Structures 228, no. 3 (2013): 329–30. http://dx.doi.org/10.1524/ncrs.2013.0160.

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28

Wolińska, Ewa. "Chiral oxazoline ligands with two different six-membered azaheteroaromatic rings – synthesis and application in the Cu-catalyzed nitroaldol reaction." Heterocyclic Communications 22, no. 2 (2016): 85–94. http://dx.doi.org/10.1515/hc-2016-0001.

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AbstractSynthesis and catalytic activity of chiral ligands 5,6-diphenyl-3-{3-[(4S/R)-4-R/Ar-4,5-dihydro-1,3-oxazol-2-yl]pyridin-2-yl}amino-1,2,4-triazines 2 and their analogs 3 possessing an N-oxide function in the pyridine ring are described. The pivotal step in the synthesis of ligands 2 is the Buchwald-Hartwig Pd-catalyzed cross-coupling reaction between 3-bromo-5,6-diphenyl-1,2,4-triazine (7a) and enantiopure 3-(4,5-dihydro-1,3-oxazol-2-yl)pyridin-2-amines 6a–d. Aromatic nucleophilic substitution of chlorine in 3-chloro-5,6-diphenyl-1,2,4-triazine (7b) with 3-(4,5-dihydro-1,3-oxazol-2-yl)p

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29

Glatz, Germund, Torsten Irrgang, and Rhett Kempe. "Crystal structure of (4-methyl-pyridin-2-yl)-(2,4,6-trimethyl-phenyl)- amine, C15H18N2." Zeitschrift für Kristallographie - New Crystal Structures 222, no. 3 (2007): 265–66. http://dx.doi.org/10.1524/ncrs.2007.0112.

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30

Abdel-Aziz, Hatem A., Khalid A. Al-Rashood, Hazem A. Ghabbour, Suchada Chantrapromma, and Hoong-Kun Fun. "5,6-Dimethyl-4-(thiophen-2-yl)-1H-pyrazolo[3,4-b]pyridin-3-amine." Acta Crystallographica Section E Structure Reports Online 68, no. 3 (2012): o612—o613. http://dx.doi.org/10.1107/s1600536812004126.

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31

Jiang, Quan-Fu, and Chun-Xiong Lu. "N-{2-[4-(2-Methoxyphenyl)piperazin-1-yl]ethyl}pyridin-2-amine monohydrate." Acta Crystallographica Section E Structure Reports Online 66, no. 7 (2010): o1727. http://dx.doi.org/10.1107/s1600536810022816.

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32

Bai, Song, Shan Liu, Yunying Zhu, et al. "Solvent-Free Synthesis and Antiviral Activity of Chiral Dialkyl 2-(Substituted-((4-(Pyridin-3-Yl)Pyrimidin-2-Yl)Amino)Methyl) Malonate." Journal of Chemical Research 42, no. 8 (2018): 428–33. http://dx.doi.org/10.3184/174751918x15339142171145.

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An efficient asymmetric synthesis of chiral β-amino acid ester derivatives containing a 4-(pyridin-3-yl)pyrimidin-2-yl amine moiety was developed. This catalytic asymmetric Mannich reaction gave target products in high yields (95%) and excellent enantioselectivities (>99% ee) using a cinchona-based squaramide catalyst under solvent-free, one-pot conditions. Antiviral bioassays indicated that some of the chiral products exhibited higher antiviral activities against tobacco mosaic virus than the commercial compound ribavirin.

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33

Melekhina, Valeriya G., Andrey N. Komogortsev, Boris V. Lichitsky, et al. "One-pot synthesis of substituted pyrrolo[3,4-b]pyridine-4,5-diones based on the reaction of N-(1-(4-hydroxy-6-methyl-2-oxo-2H-pyran-3-yl)-2-oxo-2-arylethyl)acetamide with amines." Beilstein Journal of Organic Chemistry 15 (November 25, 2019): 2840–46. http://dx.doi.org/10.3762/bjoc.15.277.

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The condensation of primary amines with N-(1-(4-hydroxy-6-methyl-2-oxo-2H-pyran-3-yl)-2-oxo-2-arylethyl)acetamides was explored. Thus, a previously unknown recyclization of the starting material was observed in acidic ethanol in the presence of an amine, which provided the corresponding dihydropyrrolone derivative as the major reaction product. Based on this transformation, a practical and convenient one-pot synthetic method for substituted pyrrolo[3,4-b]pyridin-5-ones could be devised.

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34

Werfeli, Ali, Jan Čejka, Ondřej Klecán, Bohumil Kratochvíl, and Josef Kuthan. "Preparation of New Optically Active Furanoids Containing Various Aza-Heterocyclic Moieties." Collection of Czechoslovak Chemical Communications 62, no. 6 (1997): 894–912. http://dx.doi.org/10.1135/cccc19970894.

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The aldehyde 2 prepared from [5-(2,3-O-isopropylidene-β-D-erythrofuranosyl)-2-methylfuran-3-yl]methanol (1) was converted to E,Z-oximes 3, 4 and imine derivative 5 by the reaction with hydroxylamine and pyridin-2-yl amine, respectively. The Knoevenagel reaction with malonic acid afforded exclusively the 3-substituted acrylic acid 6 while corresponding Hantzsch 1,4-dihydropyridines 7 and 8 were obtained by the reaction of aldehyde 2 with ethyl acetoacetate or acetylacetone and ammonia. 3,5-Dicyano-1,4-dihydropyridine derivative 9 was isolated only in forms of hydrates after the reaction of alde

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Fairuz, Zainal A., Zaharah Aiyub, Zanariah Abdullah, Seik Weng Ng та Edward R. T. Tiekink. "Tetra-μ-acetato-κ8O:O′-bis{[4-methyl-N-(4-methylphenyl)pyridin-2-amine-κN1]copper(II)}". Acta Crystallographica Section E Structure Reports Online 66, № 9 (2010): m1077—m1078. http://dx.doi.org/10.1107/s1600536810031168.

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Bernardino, Alice M. R., Luiz C. S. Pinheiro, Edward R. T. Tiekink, James L. Wardell, and Solange M. S. V. Wardell. "N-(4-Chlorophenyl)-5-(4,5-dihydro-1H-imidazol-2-yl)thieno[2,3-b]pyridin-4-amine." Acta Crystallographica Section E Structure Reports Online 68, no. 7 (2012): o2135—o2136. http://dx.doi.org/10.1107/s160053681202658x.

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37

Aline, Telzerow, Paris Juraj, Håkansson Maria, et al. "Amine Transaminase from Exophiala Xenobiotica – Crystal Structure and Engineering of a Fold IV Transaminase that Naturally Converts Biaryl Ketones." ACS Catalysis 9, no. 2 (2018): 1140–48. https://doi.org/10.5281/zenodo.3233728.

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ABSTRACT: Amine transaminases are frequently used for the production of chiral amines starting from prochiral ketones. These amines can be applied as active pharmaceutical ingredients or drug precursors. However, there are still limitations to the use of amine transaminases when it comes to bulky ketone substrates, such as biaryl ketones. Using data mining, an (<em>R</em>)-selective amine transaminase from <em>Exophiala xenobiotica</em> was identified which naturally converts biaryl ketone substrates to the corresponding amines with up to 85% conversion and excellent enantioselectivity (>99

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38

Craig, Donald C., Marcia L. Scudder, Wendy-Anne McHale, and Harold A. Goodwin. "Structural Studies of Complexes of Tridentate Terimine Systems. Crystal Structure of Bis(2,2′:6′,2′′-terpyridine)ruthenium(II) Perchlorate Hydrate, Bis(2,2′:6′,2′′-terpyridine)- osmium(II) Perchlorate Hemihydrate and Bis((1,10-phenanthrolin-2-yl)(pyridin-2-yl)amine)iron(II) Tetrafluoroborate Dihydrate." Australian Journal of Chemistry 51, no. 12 (1998): 1131. http://dx.doi.org/10.1071/c98118.

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The crystal structures of bis(2,2′:6′,2″-terpyridine)ruthenium(II) perchlorate hydrate, bis(2,2′:6′,2″- terpyridine)osmium(II) perchlorate hemihydrate and bis((1,10-phenanthrolin-2-yl)(pyridin-2-yl)- amine)iron(II) tetrafluoroborate dihydrate are described. In the terpyridine complexes the ruthenium-nitrogen distances and the corresponding osmium-nitrogen distances are not significantly different. In both complexes the ligand geometry and the metal ion environment show the distortions usual for bis(terpyridine) systems. Distortions are less marked in the bis((1,10-phenanthrolin-2-yl)(pyridin-2

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39

Yamaguchi-Terasaki, Yukiko, Takashi Fujihara, Akira Nagasawa, and Sumio Kaizaki. "Crystal structure offac-trichlorido[tris(pyridin-2-yl-N)amine]chromium(III)." Acta Crystallographica Section E Crystallographic Communications 71, no. 1 (2015): 73–75. http://dx.doi.org/10.1107/s2056989014027066.

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In the neutral complex molecule of the title compound,fac-[CrCl3(tpa)] [tpa is tris(pyridin-2-yl)amine; C15H12N4], the CrIIIion is bonded to three N atoms that are constrained to afacialarrangement by the tpa ligand and by three chloride ligands, leading to a distorted octahedral coordination sphere. The average Cr—N and Cr—Cl bond lengths are 2.086 (5) and 2.296 (4) Å, respectively. The complex molecule is located on a mirror plane. In the crystal, a combination of C—H...N and C—H...Cl hydrogen-bonding interactions connect the molecules into a three-dimensional network.

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Butcher, Ray J., Yilma Gultneh та T. B. Yisgedu. "Bis[(2-methylbenzyl)bis(pyridin-2-ylmethyl-κN)amine-κN]manganese(II) bis(perchlorate)". Acta Crystallographica Section E Structure Reports Online 70, № 3 (2014): m100—m101. http://dx.doi.org/10.1107/s1600536814003055.

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In the title complex, [Mn(C20H21N3)2](ClO4)2, two tridentate (2-methylbenzyl)bis(pyridin-2-ylmethyl)amine (L) ligands form the MnIIcomplex [MnL2](ClO4)2. The MnIIion lies on a twofold axis and the complex cation is significantly distorted from regular octahedral geometry. The packing is stabilized by weak C—H...O interactions between the cations and anions, which link them into a zigzag ribbon along [101]. The perchlorate anion is disordered and was constrained to be tetrahedral with two orientations having occupancies of 0.768 (4) and 0.232 (4). The 2-methylbenzyl moiety is also disordered ov

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Zhang, Ping, Xiang-Yang Bai, and Ting Zhang. "Crystal structure of 9-butyl-6-[2-(pyridin-4-yl)ethenyl]carbazol-3-amine." Acta Crystallographica Section E Crystallographic Communications 71, no. 5 (2015): o345—o346. http://dx.doi.org/10.1107/s2056989015007975.

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The asymmetric unit of the title compound, C23H23N3, consists of two molecules,AandB, with different conformations. In moleculeA, the dihedral angle between the carbazole ring system (r.m.s. deviation = 0.028 Å) and the pyridine ring is 20.28 (9)° and the N—C—C—C torsion angle of the butyl side chain is −63.4 (3)°. The equivalent data for moleculeBare 0.065 Å, 48.28 (11)° and 61.0 (3)°, respectively. In the crystal, the components are connected by weak N—H...N hydrogen bonds, generating [030]C(14) chains of alternatingAandBmolecules.

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Parashchenko, Yuliia, Anna Pavlishchuk, Nadezhda A. Bokach та Matti Haukka. "Tetrakis[bis(pyridin-2-yl)amine-κN2](nitrato-κO)silver(I)". Acta Crystallographica Section E Structure Reports Online 70, № 2 (2014): m58—m59. http://dx.doi.org/10.1107/s1600536814000907.

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In the title complex, [Ag(NO3)(C10H9N3)4], the nitrate ligand is found to be disordered over two sets of positions, with occupancy factors of 0.473 (5) and 0.527 (5). The AgIion is located in a square-pyramidal coordination environment formed by four N atoms from four bis(pyridin-2-yl)amine ligands and one O atom from a nitrate ligand. Weak interactions between the AgIions and the nitrate anions acting in a monodentate mode [Ag...O = 2.791 (13) and 2.816 (9) Å for the major component of the nitrate ligand, and 2.865 (8) and 2.837 (8) Å for the minor component] link the complex molecules into a

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Woo, Jeongkyu, Soo Kyung Kang, Ju Hee Han, et al. "Red Phosphorescent Platinum(II) Complexes with Tetradentate Pyridine-Containing Ligands for Organic Light Emitting Diodes." Journal of Nanoscience and Nanotechnology 20, no. 11 (2020): 6669–74. http://dx.doi.org/10.1166/jnn.2020.18758.

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Here, red phosphorescent platinum(II) complexes based on tetradentate pyridine-containing lig-ands are studied. To investigate their electroluminescent properties, multilayer devices were fabricated in the following sequence; ITO (180 nm)/4,4′,4″-Tris[2-naphthyl(phenyl)amino]triphenylamine (2-TNATA) (30 nm)/N, N′-di(1-naphthyl)-N,N′-diphenyl-1,1′-biphenyl)4,4′-diamine (NPB) (20 nm)/ Tris(4-carbazoyl-9-ylphenyl)amine (TCTA) (10 nm)/4,4′-Bis(N-carbazolyl)-1,1′-biphenyl (CBP) (20 nm)/Platinum(II) complex (20 nm)/1,3,5-Tris(1-Phenyl-1H-benzimidazol-2-yl)benzene) (TPBi) (40 nm)/Liq (2 nm)/Al (100 n

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44

Yin, Xuelian, and Yang-Heon Song. "5-Methyl-1-phenyl-3-(thieno[2,3-d]pyrimidin-4-yl)chromeno[4,3-d]pyrazolo[3,4-b]pyridin-6(3H)-one." Molbank 2022, no. 4 (2022): M1469. http://dx.doi.org/10.3390/m1469.

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A chromeno[4,3-d]pyrazolo[3,4-b]pyridinone derivative 3 bearing thieno[2,3-d]pyrimidine moiety, 5-methyl-1-phenyl-3-(thieno[2,3-d]pyrimidin-4-yl)chromeno[4,3-d]pyrazolo[3,4-b]pyridin-6(3H)-one, was efficiently prepared in 75% yield by the reaction of 3-phenyl-1-(thieno[2,3-d]pyrimidin-4-yl)-1H-pyrazol-5-amine 1 with 3-acetyl-2H-chromen-2-one 2 in the presence of FeCl3-SiO2 as a catalyst in refluxing ethanol for 6 h. The structure of the new synthesized compound was characterized by 1H-, 13C- NMR, IR spectroscopy, mass-spectrometry, and elemental analysis.

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Kumar, Gaurav, Pankaj Paliwal, Nishant Patnaik, and Ranjana Patnaik. "Withania somniferaphytochemicals confer neuroprotection by selective inhibition of nNos: Anin silicostudy to search potent and selective inhibitors for human nNOS." Journal of Theoretical and Computational Chemistry 16, no. 05 (2017): 1750042. http://dx.doi.org/10.1142/s0219633617500420.

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Neuronal nitric oxide synthase (nNOS or NOS1) is an important therapeutic target for the treatment of various neurological diseases. A major challenge faced in the design of nNOS inhibitors emphasizes on potency in humans and selectivity over other NOS isoforms — eNOS and iNOS. The present structural-based in silico study was carried out to search potent and selective inhibitor for human nNOS from a set of 40 Withania somnifera phytochemicals structure. Ten phytochemicals appear as dual-selective inhibitors of nNOS over both iNOS and eNOS. Here we report five potent and selective human nNOS in

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46

Liu, Yuan-Yuan, Pan Yang та Bin Ding. "Diaquabis(thiocyanato-κN)bis[6-(4H-1,2,4-triazol-4-yl-κN1)pyridin-2-amine]cadmium". Acta Crystallographica Section E Structure Reports Online 68, № 8 (2012): m1095—m1096. http://dx.doi.org/10.1107/s1600536812032473.

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In the title compound, [Cd(NCS)2(C7H7N5)2(H2O)2], the CdIIcation lies on an inversion center and is coordinated by the N atoms of two thiocyanate anions, by N atoms of two 6-(4H-1,2,4-triazol-4-yl)pyridin-2-amine ligands and by the O atoms of two water molecules in a distorted N4O2octahedral geometry. The dihedral angle between the triazole and pyridine rings is 23.15 (12)°. In the crystal, molecules are linked by N—H...N and O—H...S hydrogen bonds. Offset π–π stacking between parallel pyridine rings of adjacent molecules is also observed, the centroid–centroid distance being 3.6319 (14) Å.

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47

Chandrashekaraiah, Mallikarjunaswamy, Mallesha Lingappa, Vathsala Deepu Channe Gowda, and Doddamedur Giddegowda Bhadregowda. "Synthesis of Some New Pyrimidine-Azitidinone Analogues and Their Antioxidant,In VitroAntimicrobial, and Antitubercular Activities." Journal of Chemistry 2014 (2014): 1–9. http://dx.doi.org/10.1155/2014/847180.

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A series of 1-(3-(4-(pyridin-3-yl)pyrimidin-2-ylamino)-4-methylphenyl)-3-chloro-4-(2-mercaptoquinolin-3-yl)azetidin-2-one (7a-j) have been synthesized from the condensation of aromatic amines withN-phenylacetamide. The thione nucleus formed from 2-chloroquionoline-3-carbadehyde using sodium sulphide in dimethyl formamide (DMF) was followed by the reaction with pyrimidine amine to form the Schiff base intermediates. Attempt has been made to derive final azetidinone analogues from Schiff bases by using chloroacetyl chloride. The newly synthesized analogues were examined for the antimicrobial act

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Naskar, Kaushik, Suvendu Maity, Himadri Sekhar Maity, and Chittaranjan Sinha. "A Reusable Efficient Green Catalyst of 2D Cu-MOF for the Click and Knoevenagel Reaction." Molecules 26, no. 17 (2021): 5296. http://dx.doi.org/10.3390/molecules26175296.

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[Cu(CPA)(BDC)]n (CPA = 4-(Chloro-phenyl)-pyridin-4-ylmethylene-amine; BDC = 1,4-benzenedicarboxylate) has been synthesized and structurally characterized by single crystal X-Ray diffraction measurement. The structural studies establish the copper (II) containing 2D sheet with (4,4) square grid structure. The square grid lengths are 10.775 and 10.769 Å. Thermal stability is assessed by TGA, and subsequent PXRD data establish the crystallinity. The surface morphology is evaluated by FE-SEM. The N2 adsorption−desorption analysis demonstrates the mesoporous feature (∼6.95 nm) of the Cu-MOF. This p

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Hua, Carol, Brendan F. Abrahams, and Deanna M. D’Alessandro. "Controlling Interpenetration in Electroactive Co(II) Frameworks Based on the Tris(4-(pyridin-4-yl)phenyl)amine Ligand." Crystal Growth & Design 16, no. 3 (2016): 1149–55. http://dx.doi.org/10.1021/acs.cgd.5b01266.

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Rechel, P. A., and S. Jyothi. "Synthesis, Characterization, and Biological Activity of 1-(Pyridin-4-yl)-1H-pyrazol-5-amine Derivatives." Russian Journal of Organic Chemistry 60, no. 12 (2024): 2417–21. https://doi.org/10.1134/s1070428024120157.

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