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Journal articles on the topic '5-b]pyridine'

Author: Grafiati

Published: 4 June 2021

Last updated: 10 February 2022

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1

Štarha, Pavel, and Zdeněk Trávníček. "5-Bromo-1H-pyrrolo[2,3-b]pyridine." Acta Crystallographica Section E Structure Reports Online 69, no. 3 (2013): o381. http://dx.doi.org/10.1107/s1600536813004157.

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2

Macor, John E., Ronald Post, and Kevin Ryan. "A synthesis of 5-carboxamidopyrrolo[3,2-b]pyridine." Journal of Heterocyclic Chemistry 29, no. 6 (1992): 1465–67. http://dx.doi.org/10.1002/jhet.5570290616.

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3

Grinberga, S., A. Krauze, L. Krasnova, and G. Duburs. "Synthesis of 4-Benzo[1,3]Dioxol-5-Ylthieno-[2,3-b]Pyridines." Latvian Journal of Chemistry 51, no. 1-2 (2012): 143–48. http://dx.doi.org/10.2478/v10161-012-0002-2.

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Synthesis of 4-Benzo[1,3]Dioxol-5-Ylthieno-[2,3-b]Pyridines 4,7-Dihydrothieno[2,3-b]pyridine 4 and thieno[2,3-b]pyridine 6 were obtained by Thorpe-Ziegler cyclization. Mn(OAc)3/acetic acid system had been used for oxidation of 1,4-dihydropyridine 3 to pyridine derivative 5. 6-Carbamoylmethylsulfanyl-1,4-dihydropyridine 3 was prepared by al-kylation of piperidinium 1,4-dihydropyridine-2-thiolate 1 with iodoacet-amide.

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4

MACOR, J. E., R. POST, and K. RYAN. "ChemInform Abstract: Synthesis of 5-Carboxamidopyrrolo(3,2-b)pyridine." ChemInform 24, no. 17 (2010): no. http://dx.doi.org/10.1002/chin.199317182.

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5

Zavarzin, I. V., N. G. Smirnova, V. N. Yarovenko, and M. M. Krayushkin. "Synthesis of 5-aminothiazolo[4,5-b]pyridine-2-carboxamides." Russian Chemical Bulletin 53, no. 6 (2004): 1353–54. http://dx.doi.org/10.1023/b:rucb.0000042301.73789.33.

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6

Quiroga, Jairo, Yurina Díaz, Justo Cobo, and Christopher Glidewell. "Hydrogen-bonded assembly in six closely related pyrazolo[3,4-b]pyridine derivatives; a simple chain, three types of chains of rings and a complex sheet structure." Acta Crystallographica Section C Crystal Structure Communications 68, no. 1 (2011): o12—o18. http://dx.doi.org/10.1107/s0108270111050207.

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Six closely related pyrazolo[3,4-b]pyridine derivatives, namely 6-chloro-3-methyl-1,4-diphenylpyrazolo[3,4-b]pyridine-5-carbaldehyde, C20H14ClN3O, (I), 6-chloro-3-methyl-4-(4-methylphenyl)-1-phenylpyrazolo[3,4-b]pyridine-5-carbaldehyde, C21H16ClN3O, (II), 6-chloro-4-(4-chlorophenyl)-3-methyl-1-phenylpyrazolo[3,4-b]pyridine-5-carbaldehyde, C20H13Cl2N3O, (III), 4-(4-bromophenyl)-6-chloro-3-methyl-1-phenylpyrazolo[3,4-b]pyridine-5-carbaldehyde, C20H13BrClN3O, (IV), 6-chloro-4-(4-methoxyphenyl)-3-methyl-1-phenylpyrazolo[3,4-b]pyridine-5-carbaldehyde, C21H16ClN3O2, (V), and 6-chloro-3-methyl-4-(4-n

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7

Körte, Leif A., Robin Warner, Yury V. Vishnevskiy, Beate Neumann, Hans-Georg Stammler, and Norbert W. Mitzel. "Intramolecular pyridine-based frustrated Lewis-pairs." Dalton Transactions 44, no. 21 (2015): 9992–10002. http://dx.doi.org/10.1039/c5dt01068c.

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Besides a series of pyridine-based Lewis pairs with B(C<sub>6</sub>F<sub>5</sub>)<sub>2</sub> groups with varying electronic and steric situations and strong intramolecular B–N bonds, 2-[(CH<sub>2</sub>)<sub>4</sub>B(C<sub>6</sub>F<sub>5</sub>)<sub>2</sub>]-6-tBu-pyridine was found to behave as a frustrated Lewis pair.

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8

Yan, Feng, Ying Li, and Ze Hui Li. "Synthesis and Characterization of S-Tenatoprazole." Advanced Materials Research 881-883 (January 2014): 384–89. http://dx.doi.org/10.4028/www.scientific.net/amr.881-883.384.

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Make 5-methoxy-2-mercapto-imidazo[4,5-b]pyridine and 2-chloro-3,5-dimethyl-4-methoxy-pyridine hydrochloride as the starting materials, in alkaline conditions, use nucleophilic substitution to generate the prochiral sulfide: 2-[2-(4-methoxy-3 ,5-dimethyl-pyridine) methylmercapto]-5-methoxy-imidazo [4,5-b] pyridine. After recrystallization twice, gain the product with the yield of 80%, and the purity of 99.6% and above. Then make D-(-)-diethyl tartrate and tetraisopropyl titanate as the chiral reagents, in alkaline conditions, use cumene hydroperoxide oxide to oxidize prochiral sulfide, for synt

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9

Gad-Elkareem, Mohamed A. M., Azza M. Abdel-Fattah, and Mohamed A. A. Elneairy. "Pyrazolo[3,4-b]pyridine in heterocyclic synthesis: synthesis of new pyrazolo[3,4-b]pyridines, imidazo[1',2':1,5]pyrazolo[3,4-b]pyridines, and pyrido[2',3':3,4]pyrazolo[1,5-a]pyrimidines." Canadian Journal of Chemistry 85, no. 9 (2007): 592–99. http://dx.doi.org/10.1139/v07-089.

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Pyrazolo[3,4-b]pyridine derivatives 7 and 9 were synthesized via the reaction of 3-amino-1H-pyrazolo-[3,4-b]pyridine derivative 2 with ω-bromoacetophenones. Reaction of 7 and 9 with Ac2O afforded the imidazo[1',2':1,5]py razolo[3,4-b]pyridine derivative 8 and pyrazolo[3,4-b]pyridine derivative 10, respectively. Reaction of 2 with chloroacetonitrile followed by DMF-DMA gave imidazo[1',2':1,5]pyrazolo[3,4-b]pyridines 4 and 5, respectively. Acetyl acetone and 1,1-dicyano-2,2-dimethylthioethene were reacted with 2 to afford the pyrido[2',3':3,4]pyrazolo-[1,5-a]-pyrimidines 11 and 14, respectively.

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10

Ishiguro, Toshihiro, Kiyoshi Ukawa, Yoshikazu Wada, and Akira Nohara. "Synthesis of 5-Oxo-5H-[1]benzopyrano[4,3-b]pyridine Derivatives." HETEROCYCLES 24, no. 7 (1986): 1931. http://dx.doi.org/10.3987/r-1986-07-1931.

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11

Proença, M. Fernanda, Magdi E. Zaki, and Brian L. Booth. "New and Efficient Synthesis of Imidazo[4,5-b]pyridine-5-ones." Synlett, no. 16 (2005): 2429–32. http://dx.doi.org/10.1055/s-2005-872700.

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12

Kadysh, V. P., Ya P. Stradyn', Ya R. Uldrikis, and G. Ya Dubur. "Electrochemical conversions of 5-oxo-1,4-dihydroindeno[1,2-b]pyridine derivatives." Chemistry of Heterocyclic Compounds 28, no. 9 (1992): 1036–41. http://dx.doi.org/10.1007/bf00531482.

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13

Soares, Júlio C. A. V., and Luiza R. S. Dias. "N′-Acetyl-3-methyl-1,6-diphenyl-1H-pyrazolo[3,4-b]pyridine-4-carbohydrazide." Molbank 2020, no. 1 (2020): M1104. http://dx.doi.org/10.3390/m1104.

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Synthesis of N′-acetyl-3-methyl-1,6-diphenyl-1H-pyrazolo[3,4-b]pyridine-4-carbohydrazide from the phenyl acetates of 3-acetyl-5-(3-methyl-1,6-diphenyl-1H-pyrazolo[3,4-b]pyridine-4-yl)-2,3-dihydro-1,3,4-oxadiazol-2-yl in alkaline medium and its characterization by spectroscopic methods.

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14

Dyall, LK, DW Maloney, JJ Harvey, and BE Fulloon. "Oxidative and Thermal Routes to Novel Isoxazolopyridines." Australian Journal of Chemistry 49, no. 7 (1996): 761. http://dx.doi.org/10.1071/ch9960761.

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The novel bicyclic compounds isoxazolo [3,4-b] pyridine (1). 3-phenylisoxazolo [3,4- b] pyridine (2) and 3-phenylisoxazolo[3,4-c]pyridine (3) have been synthesized by oxidative cyclization of the amines 2-aminopyridine-3-carbaldehyde (4), (2-amino-3-pyridyl)phenylmethanone (5) and (3-amino-4-pyridyl)phenylmethanone (6). The oxidant was bis(acetato-O)phenyliodine. 3-Phenylisoxazolo[3,4-c]pyridine (3) was also obtained by thermolysis of 3-azido-4-benzoylpyridine (7). Comparison of the rate of thermolysis of this azide with that of 3-azidopyridine identified a neighbouring group effect (from the

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15

Yakovenko, G. G., and M. V. Vovk. "Convenient approaches to the synthesis of 6-amino- and 6-oxoimidazo[4,5-b]pyrazolo[3,4-e]pyridines." Journal of Organic and Pharmaceutical Chemistry 19, no. 1(73) (2021): 10–15. http://dx.doi.org/10.24959/ophcj.21.224583.

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Aim. To develop convenient approaches to the synthesis of 6-amino- and 6-oxoimidazo[4,5-b]pyrazolo[3,4-e]pyridines as promising biologically active scaﬀolds.Results and discussion. It has been found that cyclocondensation of N-Boc-4-aminopyrazole-5-carbaldehydes with creatinine can be used as an eﬀective method for obtaining 6-aminoimidazo[4,5-b]pyrazolo[3,4-e]pyridines previously unknown. For the synthesis of their 6-oxoanalogs, the reaction of 5-aminopyrazolo[4,3-b]pyridine-6-carboxylic acids used in a modifed Curtius rearrangement with diphenylphosphorylazide was successful. This method was

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16

Muceniece, D., S. Stupnikova, and V. Lusis. "ChemInform Abstract: 4a-Alkyl Derivatives of 5-Oxo-4H-4a,5-dihydroindeno[1,2-b]pyridine." ChemInform 33, no. 17 (2010): no. http://dx.doi.org/10.1002/chin.200217141.

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17

Girgis, Adel S., and I. S. Ahmed-Farag. "Synthesis of Novel 2-Alkoxy-5H-benzo[6,7]cyclohepta[1,2-b]pyridine-3-carbonitriles." Zeitschrift für Naturforschung B 58, no. 7 (2003): 698–703. http://dx.doi.org/10.1515/znb-2003-0716.

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Reaction of 6-arylmethylene-6,7,8,9-tetrahydro-5H-benzocyclo-hepten-5-ones (1) with malononitrile in the appropriate alcohol in the presence of sodium afforded the corresponding 2-alkoxy-4-aryl- 6,7-dihydro-5H-benzo[6,7]cyclohepta[1,2-b]pyridine-3-carbonitriles (2) and not their isomeric forms 2-alkoxy-4-aryl-6,7-dihydro-5H-benzo[3,4]-cyclohepta[1,2-c]pyridine-1-carbonitriles (3). The proposed structure was confirmed via independent synthesis of (2) through the reaction of 6,7,8,9- tetrahydro-5-benzocycloheptenone (4) with the appropriate ylidenemalononitriles 5 under the same reaction conditi

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18

Khakwani, Samia, Samina Aslam, Mehrzadi Noureen Shahi, Alice M. Rolim Bernardino, and Misbahul Ain Khan. "Mass Spectrometry of Substituted Ethyl-4-anilinopyrazolo[3,4-b]pyridine-5-carboxylates." Asian Journal of Chemistry 28, no. 4 (2016): 789–92. http://dx.doi.org/10.14233/ajchem.2016.19477.

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19

Wu, Daoxin, Minhua Liu, Zhong Li, et al. "Synthesis and fungicidal activity of novel imidazo[4, 5-b]pyridine derivatives." Heterocyclic Communications 25, no. 1 (2019): 8–14. http://dx.doi.org/10.1515/hc-2019-0003.

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AbstractA series of novel imidazo[4,5-b]pyridine derivatives were synthesized and their structures were characterized by NMR spectroscopy, mass spectrometry and elemental analysis. The results of bioassays showed that some compounds exhibit good fungicidal activity against Puccinia polysora In particular, compound 7b showed an EC50 value of 4.00 mg/L, which was comparable with that of tebuconazole. Besides, preliminary structure-activity relationship was discussed.

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20

Choi, Woo-Baeg, Ioannis N. Houpis, Hywyn R. O. Churchill, et al. "A practical synthesis of the 5-chloromethyl-furo[2,3-b]pyridine pharmacophore." Tetrahedron Letters 36, no. 26 (1995): 4571–74. http://dx.doi.org/10.1016/0040-4039(95)00850-c.

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21

Al-Trawneh, Salah A., Amer H. Tarawneh, Anastassiya V. Gadetskaya, et al. "Synthesis and Cytotoxicity of Thieno[2,3-b]Pyridine Derivatives Toward Sensitive and Multidrug-Resistant Leukemia Cells." Acta Chimica Slovenica 68, no. 2 (2021): 458–65. http://dx.doi.org/10.17344/acsi.2020.6609.

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A new series of substituted ethyl 7-cyclopropyl-2-(2-aryloxo)-3-nitro-4-oxo-4,7-dihydrothieno[2,3-b]pyridine-5-carboxylates 3a–e were prepared by utilizing ethyl 2-chloro-7-cyclopropyl-3-nitro-4-oxo-4,7-dihydrothieno[2,3-b]pyridine-5-carboxylate (1) and replacing of the 2-chlorine with anions obtained from phenol (2a), salicylaldehyde derivatives 2b–d or thiophenol (2e), leading to the respective ethyl 7-cyclopropyl-2-(2-aryloxo)-3-nitro-4-oxo-4,7-dihydrothieno[2,3-b]pyridine-5-carboxylates 3a–e. The new compounds were evaluated for their in vitro cytotoxicity towards sensitive CCRF-CEM and mu

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22

Goher, M. A. S., M. A. M. Abu-Youssef, F. A. Mautner та H. P. Fritzer. "Crystal Structure Investigation of Two Polymeric Chromium(III) Azide Complexes; KCr(pyridine)4(N3)4 and RbCr(pyridine)3(N3)4. A Structure Containing μ(l,3) and μ(1,1,3) Bridging Azido Ligands between Chromium and Rubidium Centered Polyhedra". Zeitschrift für Naturforschung B 47, № 12 (1992): 1754–58. http://dx.doi.org/10.1515/znb-1992-1219.

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The structures of two polymeric complexes of chromium(III) azide with pyridine, KCr(py)4(N3)4 (1), and RbCr(py)3(N3)4 (2), were determined by X-ray crystallography. Crystal data: 1, C20H20N16CrK, monoclinic, space group C2/c, a = 1611.2(5), b = 1050.6(3), c = 1609.0(5) pm, β = 91.69(3)°, Ζ = 4 and Rw = 0.037 for 923 diffractometer data; 2, C15H15N15CrRb, monoclinic, space group P21/n, a = 1311.9(3), b = 1139.0(4), c = 1523.3(4) pm, β = 109.39(2)°, Ζ = 4 and Rw = 0.046 for 2336 data.The crystal structure of 1 contains six-coordinated chromium and potassium cations with two pyridine ligands and

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23

Abd El Latif, Fawi M., Magda A. Barsy, Eman A. Elrady, and M. Hassan. "New Routes for Novel Pyrazolo[3,4-b][1,6]-naphthyridine, Pyrazolo[3,4-b]pyridine and Pyrazolo[3,4:2,3]pyrido[6,1-a]benzimidazole Derivatives." Journal of Chemical Research 23, no. 12 (1999): 696–97. http://dx.doi.org/10.1177/174751989902301206.

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Pyrazolo[3,4- b] [1,6] naphthyridine, pyrazolo[3,4- b] pyridine and pyrazolo[3,4:2,3] pyrido [6,1 -a] benzimidazole derivatives are synthesized starting from the isomeric 3-substituted 5-chloro-1-phenylpyrazole-4-carbaldehyde.

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24

Surya Prakash Rao, H., Ramalingam Gunasundari, and Jayaraman Muthukumaran. "Crystal structure analysis of ethyl 6-(4-methoxyphenyl)-1-methyl-4-methylsulfanyl-3-phenyl-1H-pyrazolo[3,4-b]pyridine-5-carboxylate." Acta Crystallographica Section E Crystallographic Communications 76, no. 8 (2020): 1209–12. http://dx.doi.org/10.1107/s2056989020008841.

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In the title compound, C24H23N3O3S, the dihedral angle between the fused pyrazole and pyridine rings is 1.76 (7)°. The benzene and methoxy phenyl rings make dihedral angles of 44.8 (5) and 63.86 (5)°, respectively, with the pyrazolo[3,4-b] pyridine moiety. An intramolecular short S...O contact [3.215 (2) Å] is observed. The crystal packing features C—H...π interactions.

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25

Malottki, B. v., and W. Preetz. "Darstellung und Kristallstruktur von (n-Bu4N)[ReBr5Py] / Synthesis and Crystal Structure of (n-Bu4N)[ReBr5Py]." Zeitschrift für Naturforschung B 55, no. 6 (2000): 484–86. http://dx.doi.org/10.1515/znb-2000-0607.

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By reaction of (n-Bu4N)2[ReBr6] with pyridine and (n-Bu4N)BH4 in dichloromethane various bromo-pyridine-rhenium(III) complexes are formed which can be separated by chromatography. Electrochemical oxidation of (n-Bu4N)2[ReBr5Py] leads to (n-Bu4N)[ReBr5Py]. X-ray structure determination on a single crystal has been performed of (n-Bu4N)[ReBr5Py] (monoclinic, space group P21/n a = 11,248(5), b = 17,192(5), c = 15,206(5) Å, β = 97,600(5)°, Z = 4).

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26

Girges, Margret Mansour, Mohamed Mahmoud Abou El-Zahab, and Mokhtar Ayad Hanna. "Facile synthesis and biological activity of sulfonate ester-containing imidazolylpyridine, imidazo(4,5-b)pyridine and imidazo(5',1':2,3)imidazo(4,5-b)pyridine derivatives." Collection of Czechoslovak Chemical Communications 54, no. 4 (1989): 1096–103. http://dx.doi.org/10.1135/cccc19891096.

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Different ring systems containing imidazole and/or pyridine moieties and accomodating sulfonate ester moiety in their structure were prepared via ring opening of 2-oxazolin-5-one derivatives under various reaction conditions. The assigned structures for the prepared compounds were established through elemental analysis, spectral data and if possible by alternative synthetic routes. The antimicrobial activity of the synthesized compounds was also investigated.

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27

Amr, Abdel-Galil E. "Synthesis of Some New Linear and Chiral Macrocyclic Pyridine Carbazides as Analgesic and Anticonvulsant Agents." Zeitschrift für Naturforschung B 60, no. 9 (2005): 990–98. http://dx.doi.org/10.1515/znb-2005-0914.

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A series of 2,6-disubstituted pyridine derivatives were prepared from 2,6-diacetylpyridine or 2,6- dicarbonyl pyridine dichloride as starting materials. Reaction of 2,6-diacetylpyridine 1 with hydroxylamine hydrochloride or different aromatic aldehydes afforded the corresponding 2,6-diacetylpyridine dioxime and 2,6-bis-[β -(2-thienyl)acryloyl]pyridine derivatives 2 and 3, respectively. Additionally, N2,N2‘-(pyridine-2,6-dicarbonyl)-L-amino acid hydrazides 5 were prepared starting from 2,6- dicarbonyl pyridine dichloride via the corresponding esters 4. Compound 3 was reacted with hydroxylamine

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28

Jin, Fang, Yugang Cui, Zebao Rui, and Yongdan Li. "Effect of sequential desilication and dealumination on catalytic performance of ZSM-5 catalyst for pyridine and 3-picoline synthesis." Journal of Materials Research 25, no. 2 (2010): 272–82. http://dx.doi.org/10.1557/jmr.2010.0033.

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A sequential procedure of alkaline treatment followed by SiCl4 or hydrothermal treatment has been investigated to obtain a tailored ZSM-5 catalyst for the synthesis of pyridine bases. The major function of alkaline treatment is desilication; however, it is accompanied by the extraction of framework aluminum, which formed the extra-framework alumina and amorphous alumina by realumination. Moreover, a large number of intracrystalline meso- and macropores and silanol groups are created. The desilication and realumination cause the ratio of Lewis acid sites to Brönsted acid sites (L/B) to increase

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29

Eichinger, Karl, Christoph Brunmair, and Martin Bucher. "3,10,17,24-Tetra(1-methylethyl)-[29H,31H-tetrapyrido[2,3-b:2′,3′-g:2″-3″-I:2‴,3‴ -q]porphyrazinato-(2-)N29,N30,N31,N32]-nickel- [Eu(fod)3]4- Ein lösliches Pyridoporphyrazin / 3,10,17,24-Tetra(1-methylethyl)- [29H,31H-tetrapyrido[2,3-b:2′,3′-g:2″-3″-I:2‴,3‴-q]porphyrazinato-(2-)N29,N30,N31,N32]-nickel-[Eu(fod)3]4 - A Soluble Pyridoporphyrazine." Zeitschrift für Naturforschung B 53, no. 5-6 (1998): 637. http://dx.doi.org/10.1515/znb-1998-5-624.

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Abstract Starting from diethyl 5-(methylethyl)pyridine- 2,3-dicarboxylate the crystalline and highly soluble complex 3,10,17,24-Tetra(1-methylethyl)- [29H,31H-tetrapyrido[2,3-b:2′, 3′, -g:2″-3″-I:2‴, 3‴-q]porphyrazinato(2-)N29,N30,N31 ,N32]- nickel-[Eu(fod)3]4 was prepared. In this compound each europium ligand is coordinated to a pyridine N-atom and neighboured N-atom of the porphyrazine ring.

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30

Dunne, Simon, Lasse Nurkkala, and Robert Steen. "Synthesis of the Fused Heterobicycles 5-Pyridin-2-yl-thieno[3,2-b]pyridine, 6-Pyridin-2-yl-thieno[2,3-b]pyridine and 6-Pyridin-2-yl-thieno[3,2-c]pyridine." Synthesis 2006, no. 8 (2006): 1295–300. http://dx.doi.org/10.1055/s-2006-926416.

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31

Razorenov, Dmitriy Yu, Sophia A. Makulova, Ivan V. Fedyanin, et al. "Diimidazo[4,5-b:4′,5′-e]pyridine: synthesis and nucleophilic aromatic substitution reaction." Mendeleev Communications 29, no. 2 (2019): 181–83. http://dx.doi.org/10.1016/j.mencom.2019.03.022.

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32

Khakwani, Samia, Samina Aslam, Mehrzadi Noureen Shahi, Tahir Maqbool, Alice M. Rolim Bernardino, and Misbahul Ain Khan. "Mass Spectrometry of Substituted Ethyl-4-anilinopyrazolo[3,4-b]pyridine-5-carboxylic Acids." Asian Journal of Chemistry 28, no. 6 (2016): 1258–60. http://dx.doi.org/10.14233/ajchem.2016.19644.

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33

Duque Rodríguez, J., R. Pomés Hernández, G. Diáz de Delgado, et al. "2-Ethoxycarbonyl-5-methoxycarbonyl-6-methyl-4-phenyl-4,7-dihydrothieno[2,3-b]pyridine." Acta Crystallographica Section C Crystal Structure Communications 54, no. 2 (1998): IUC9800002. http://dx.doi.org/10.1107/s0108270198099831.

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34

Selig, Roland, Dieter Schollmeyer, Wolfgang Albrecht, and Stefan Laufer. "2-(Bicyclo[2.2.1]hept-5-en-2-yl)-1H-pyrrolo[2,3-b]pyridine." Acta Crystallographica Section E Structure Reports Online 66, no. 7 (2010): o1800. http://dx.doi.org/10.1107/s1600536810022087.

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35

Zheng, Hu, Gang Lin, and Ling Ling Weng. "ChemInform Abstract: Synthesis of 5-Oxo-5H-[1]-benzopyrano[2,3-b]pyridine Derivatives." ChemInform 30, no. 9 (2010): no. http://dx.doi.org/10.1002/chin.199909168.

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36

Nathan Tumey, L., Diane H. Boschelli, Julie Lee та Divya Chaudhary. "2-Alkenylthieno[2,3-b]pyridine-5-carbonitriles: Potent and selective inhibitors of PKCθ". Bioorganic & Medicinal Chemistry Letters 18, № 15 (2008): 4420–23. http://dx.doi.org/10.1016/j.bmcl.2008.06.040.

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37

Motamedi, R. "Solvent-free synthesis of novel 5-oxo-5H-chromeno[4,3-b]pyridine derivatives." Chemistry of Heterocyclic Compounds 48, no. 12 (2013): 1839–43. http://dx.doi.org/10.1007/s10593-013-1217-1.

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38

Théveau, Laure, Cédric Schneider, Olivier Querolle, Lieven Meerpoel, Vincent Levacher, and Christophe Hoarau. "Synthesis and orthogonal functionalization of oxazolo[5′,4′:4,5]pyrano[2,3-b]pyridine by intra- and intermolecular Pd-catalyzed direct C–H bond heteroarylation." Organic & Biomolecular Chemistry 14, no. 13 (2016): 3459–68. http://dx.doi.org/10.1039/c6ob00227g.

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39

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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40

Hafez, Hend N., and Abdel-Rahman B. A. El-Gazzar. "Synthesis of Novel Pyridine Bearing Biologically Active Imidiazolyl, Pyrazolyl, Oxa/thiadiazolyl and Urea Derivatives as Promising Anticancer Agents." Current Organic Synthesis 17, no. 1 (2020): 55–64. http://dx.doi.org/10.2174/1570179417666191223163225.

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Background: A novel series of pyridine containing 1,3,4-oxa/thiadiazol derivatives 4a,b, pyrazole derivatives 5-7, thiazole derivatives 9a,b and 17a-c, urea derivatives 12a-c, imidiazole derivative 16, imidazo[1,2-a]pyridine derivatives 18a, b, tetrazole 19, pyrane 20 and pyridine derivatives 21 has been synthesized. Objective: This research aims to synthesize 6-(Trifluoromethyl)-2-[3-(trifluoromethyl)phenyl] amino nicotinohydrazide 2 and 6-(trifluoromethyl)-2-[3-(trifluoromethyl)phenyl]amino pyridin-3-carboaldhyde 15 as key intermediate for the synthesis of novel pyridine derivatives bearing

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41

Hückstädt, Heiner, and Heiner Homborg. "Synthese von Bis[pyridin-phthalocyaninato(1,5-)iridium(II)]iodid und Pyridin-iodo-phthalocyaninato(2-)iridium(III)-Pyridin durch schrittweise Oxydation von Bis[pyridin-phthalocyaninato(2-)iridium(II)]/Synthesis of Bis[pyridine-phthalocyaninato(1,5-)iridium(II)] Iodide and Pyridine-iodo-phthalocyaninato(2-)iridium(III)-Pyridine by Successive Oxidation of Bis[pyridine-phthalocyaninato(2-)iridium(II)]." Zeitschrift für Naturforschung B 52, no. 6 (1997): 728–34. http://dx.doi.org/10.1515/znb-1997-0610.

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Abstract Successive oxidation of bis[pyridine-phthalocyaninato(2-)iridium(II)] with iodine first yields mixed-valent bis[pyridine-phthalocyaninato(1,5-)iridium(II)] iodide ([(Ir(py)pc1.5-}2]I) and then pyridine-iodo-phthalocyaninato(2-)iridium(III)-pyridine ([Ir(py)(I)pc2-]·py). The latter crystallizes monoclinically with the following cell parameters: a = 10.258(1) Å, b = 17.589(3) Å, c = 19.723(2) Å, β = 92.95(1)°, space group P21/n, Z = 4. IrIII is in the centre of a slightly distorted pc2- ligand and coordinates pyridine and iodide in a trans-arrangement. The average Ir-Niso distance is 1.

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42

Lever, O. William, Harvey M. Werblood, and Ronald K. Russell. "Oxazolo[4, 5-b]pyridines. Regioselective metalation of the 2-diethylaminooxazolo[4, 5-b]pyridine system and formation of 7-substituted derivatives." Tetrahedron Letters 34, no. 2 (1993): 203–6. http://dx.doi.org/10.1016/s0040-4039(00)60547-6.

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43

Broomhead, JA, R. Greenwood, W. Pienkowski, and M. Sterns. "Preparation, X-Ray Crystal-Structure and Properties of Pentacarbonyl-(Pyridinium-2-Thiolate)Tungsten(0)." Australian Journal of Chemistry 39, no. 11 (1986): 1895. http://dx.doi.org/10.1071/ch9861895.

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The title complex is prepared either photochemically from pyridine-2-thiol and W(CO)6 or thermally from WBr2(CO)4. The molecular structure of this air-stable, diamagnetic compound shows an octahedral environment for the metal. The ligand is sulfur-bound only and the pyridine nitrogen is protonated. Crystals are monoclinic, space group P21/c with a 722.8(1), b 1375.5(4), c 1306.7(2) pm, β 98.815(5)° V 1.2839(5)×109 pm3 and Z 4; 2294 data were refined to R 0.026, Rw 0.032.

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44

Mugnaini, Claudia, Antonella Brizzi, Giorgia Vinciarelli, Marco Paolino, and Federico Corelli. "New synthesis of N1- and N2-substituted pyrazolo[4,3-b]pyridine-5-one derivatives as CB2 receptor ligands." New Journal of Chemistry 44, no. 37 (2020): 16218–26. http://dx.doi.org/10.1039/d0nj03400b.

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This synthesis of pyrazolo[4,3-b]pyridine-5-one derivatives, recently described as potent and selective agonists/inverse agonists of the cannabinoid type-2 receptor (CB2R), allows for a wider exploration of the structure-activity relationship.

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Tumey, L. Nathan, Niala Bhagirath, Biqi Wu, and Diane H. Boschelli. "A facile, scalable preparation of 4-oxo-4,7-dihydrothieno[2,3-b]pyridine-5-carbonitriles." Tetrahedron Letters 49, no. 48 (2008): 6850–52. http://dx.doi.org/10.1016/j.tetlet.2008.09.107.

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Ranjith, S., A. SubbiahPandi, A. D. Suresh, and K. Pitchumani. "3-Ethyl-5-(4-methoxyphenoxy)-2-(pyridin-4-yl)-3H-imidazo[4,5-b]pyridine." Acta Crystallographica Section E Structure Reports Online 67, no. 7 (2011): o1764. http://dx.doi.org/10.1107/s1600536811023543.

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Bonini, Carlo, Maria Funicello, Rosanna Scialpi, and Piero Spagnolo. "Smiles rearrangement for the synthesis of 5-amino-substituted [1]benzothieno[2,3- b ]pyridine." Tetrahedron 59, no. 38 (2003): 7515–20. http://dx.doi.org/10.1016/s0040-4020(03)01177-3.

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Dorostkar-Ahmadi, Nadieh, Abolghasem Davoodnia, Niloofar Tavakoli-Hoseini, and Hossein Behmadi. "Facile Synthesis of New 6-Alkylamino-1H-pyrazolo[3,4-b]pyridine-5-carbonitrile Derivatives." Journal of Heterocyclic Chemistry 55, no. 11 (2018): 2635–39. http://dx.doi.org/10.1002/jhet.3285.

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Abdel-Rahman, Abdel-Rahman H., Margret M. Girges, Abdel-Aziz S. El-Ahl, and Lamyaa M. Sallam. "Synthesis of new benzo[h]- and benzo[f]chromeno[2,3-b]-pyridine-5-ones." Heteroatom Chemistry 17, no. 1 (2006): 2–7. http://dx.doi.org/10.1002/hc.20152.

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Fadda, A. A., Hala M. Refat, M. E. A. Zaki, and H. H. Abdel Razik. "ChemInform Abstract: Synthesis and Reactions of 7-Substituted Furo[3,4-b]pyridine-5-one." ChemInform 30, no. 52 (2010): no. http://dx.doi.org/10.1002/chin.199952158.

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