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Journal articles on the topic '8-oxo-7'

Author: Grafiati

Published: 4 June 2021

Last updated: 15 February 2022

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1

Larson, S. B., H. B. Cottam, and R. K. Robins. "Structure of 7-methyl-8-oxo-7,8-dihydroguanosine monohydrate." Acta Crystallographica Section C Crystal Structure Communications 45, no. 12 (1989): 1979–83. http://dx.doi.org/10.1107/s010827018900301x.

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2

Zbiral, Erich, Shashikant Phadtare, and Walther Schmid. "Strukturelle Abwandlungen anN-Acetylneuraminsäure, 6. Synthesen von 7-Oxo- und 8-Oxo-N-acetylneuraminsäure-Derivaten." Liebigs Annalen der Chemie 1987, no. 1 (1987): 39–43. http://dx.doi.org/10.1002/jlac.198719870107.

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3

Elix, JA, UA Jenie, and GA Jenkins. "Three New Depsidones From the Lichen Neofuscelia subincerta." Australian Journal of Chemistry 40, no. 12 (1987): 2031. http://dx.doi.org/10.1071/ch9872031.

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The depsidones , glomelliferonic acid (4)(8-hydroxy-3-methoxy-ll-oxo-l-(2-oxopentyl)-6- pentyl -11H-dibenzo[ b,e ] [1,4]dioxepin-7-carboxylic acid), loxodellonic acid (5) (8-hydroxy-3-methoxy-11-oxo-1-(2-oxopenty1)-6-propyl-llH-dibenzo[ b,e ][l,4]dioxepin-7-carboxylic acid) and glomellonic acid (6) (8-hydroxy-3-methoxy-1l-oxo-l,6-di(2-oxopentyl)-11H- dibenzo [ b,e ][l,4]dioxepin-7-carboxylic acid), have been isolated from the lichen Neofuscelia subincerta ( Essl .) Essl . and characterized.

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4

Heleyová, Katarína, Dušan Ilavský, Vladimír Bobošík, and Naďa Prónayová. "Gould-Jacobs Reaction of 5- and 6-Amino-2-substituted Benzoxazoles. II. Reaction with 3-Ethoxymethylene-2,4-pentanedione and Ethyl 2-Ethoxymethylene-3-oxobutanoate." Collection of Czechoslovak Chemical Communications 61, no. 3 (1996): 371–80. http://dx.doi.org/10.1135/cccc19960371.

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Nucleophilic reaction of 5-amino- and 6-amino-2-substituted benzoxazoles 1 and 2 with 3-ethoxymethylene-2,4-pentanedione (3) gave compounds 5 and 6. Compounds 1 and 2 reacted with ethyl ethoxymethylene-3-oxobutanoate (4) under formation of compounds 7and 8. The substitution products 7 and 8 underwent thermal cyclization at high temperature (boiling mixture of diphenyl ether and biphenyl) to give angularly and linearly annelated derivatives of 5-acetyl-4-oxo-oxazolo[4,5-f]quinoline 9 and 7-acetyl-8-oxo-oxazolo[5,4-g]quinoline 10 (from 7), and derivatives of 8-acetyl-9-oxo-oxazolo[5,4-f]quinolin

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5

Gornitsky, M., A. M. Velly, S. Mohit, et al. "Altered Levels of Salivary 8-oxo-7-hydrodeoxyguanosine in Breast Cancer." JDR Clinical & Translational Research 1, no. 2 (2016): 171–77. http://dx.doi.org/10.1177/2380084416642197.

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Oxidative stress has been implicated in the pathogenesis of breast cancer (BC). To determine whether BC is associated with altered salivary redox homeostasis, we performed a case-control study assessing the relationship between BC and 8-oxo-7-hydrodeoxyguanosine (8-oxodG), a marker for oxidative damage to DNA. Enzyme-linked immunosorbent assay for 8-oxodG was used on whole, unstimulated saliva of 134 BC patients and 226 healthy controls. Associations of the redox data were assessed by analysis of variance and logistic regression analysis. Our results revealed that there were 1) significantly l

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6

Yang, Shu-Ping, Li-Jun Han, Xin-Ran He, and Li-Juan Chen. "8-Acetyl-4-methyl-2-oxo-2H-chromen-7-yl acetate." Acta Crystallographica Section E Structure Reports Online 67, no. 12 (2011): o3382. http://dx.doi.org/10.1107/s1600536811048835.

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7

Zhao, Hui, and Hai-Bin Gong. "8-Hydroxy-3,4,5-trimethyl-6-oxo-2,3,4,6-tetrahydroisoquinoline-7-carboxylic acid." Acta Crystallographica Section E Structure Reports Online 63, no. 10 (2007): o4097. http://dx.doi.org/10.1107/s1600536807045424.

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8

Banerjee, A. K., and M. Laya. "An alternative synthesis of 8-Methylene-4,4,8a-trimethyl-7-oxo-octahydronaphthalene." Monatshefte f�r Chemie Chemical Monthly 128, no. 12 (1997): 1255–59. http://dx.doi.org/10.1007/bf00807257.

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9

Thokchom, Herojit S., Anita D. Nongmeikapam, and Warjeet S. Laitonjam. "Synthesis of fused pyrazolo-, isoxazolo-, pyrimido-, and pyridopyrimidines." Canadian Journal of Chemistry 83, no. 8 (2005): 1056–62. http://dx.doi.org/10.1139/v05-054.

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A systematic study of the synthesis of the 5,7-diaryl-4-oxo-pyrazolo[3,4-d]pyrimidin-6-thiones (3), 2-phenyl-5,7-bis(2′-methylphenyl)-4-oxo-pyrazolo[3,4-d]pyrimidin-6-thiones (4b), 2(3H)-3-phenyl-5,7-diaryl-4-oxo-pyrazolo[3,4-d]pyrimidin-6-thiones (5), 5,7-diaryl-4-oxo-isoxazolo[5,4-d]pyrimidin-6-thiones (7), 3,5,7-triaryl-2,3-dihydro-4-oxo-isoxazalo[5,4-d]pyrimidin-6-thiones (8), 2-amino-6,8-diaryl-5-oxo-pyrimido[4,5-d]pyrimidin-7-thiones (9), 3,4-dihydro-2-amino-4-phenyl-6,8-diaryl-5-oxo-pyrimido[4,5-d]pyrimidin-7-thiones (10), 3-cyano-6,8-diaryl-2,5-dioxo-pyrido[2,3-d]pyrimidin-7-thiones (1

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10

Shi, Hui, Ren Ishikawa, Choon Han Heh, Shigeki Sasaki, and Yosuke Taniguchi. "Development of MTH1-Binding Nucleotide Analogs Based on 7,8-Dihalogenated 7-Deaza-dG Derivatives." International Journal of Molecular Sciences 22, no. 3 (2021): 1274. http://dx.doi.org/10.3390/ijms22031274.

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MTH1 is an enzyme that hydrolyzes 8-oxo-dGTP, which is an oxidatively damaged nucleobase, into 8-oxo-dGMP in nucleotide pools to prevent its mis-incorporation into genomic DNA. Selective and potent MTH1-binding molecules have potential as biological tools and drug candidates. We recently developed 8-halogenated 7-deaza-dGTP as an 8-oxo-dGTP mimic and found that it was not hydrolyzed, but inhibited enzyme activity. To further increase MTH1 binding, we herein designed and synthesized 7,8-dihalogenated 7-deaza-dG derivatives. We successfully synthesized multiple derivatives, including substituted

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11

Elix, John A., Judith H. Wardlaw, and Isao Yoshimura. "Sublobaric Acid and Oxolobaric Acid, Two New Depsidones from the Lichen Anzia hypoleucoides." Australian Journal of Chemistry 50, no. 7 (1997): 763. http://dx.doi.org/10.1071/c97020.

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The depsidones sublobaric acid (8-hydroxy-3-methoxy-11-oxo-1-propanoyl-6-pentyl-11H-dibenzo[b,e][1,4]- dioxepin-7-carboxylic acid) (6) and oxolobaric acid (1-(1′,4′-dioxopentyl)-8-hydroxy-3-methoxy-11-oxo-6-pentyl-11H-dibenzo[b,e][1,4]dioxepin-7-carboxylic acid) (7) have been isolated from the lichenAnzia hypoleucoides together with atranorin, chloroatranorin, divaricatic acid and lobaric acid (1). The structure of compounds (6) and (7) followed from a combination of spectroscopic data.

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12

Hlaváč, Jan, and Jan Slouka. "Synthesis of 3-(6-Azauracil-5-yl)anthranilic Acid and Its Application to the Preparation of Other 1,2,4-Triazine Derivatives." Collection of Czechoslovak Chemical Communications 61, no. 6 (1996): 941–45. http://dx.doi.org/10.1135/cccc19960941.

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The title compound was synthesized by alkaline recyclization of isatin-7-carboxylic acid semicarbazone and used for the preparation of 3-oxo-2,3-dihydro-5H-1,2,4-triazino[5,6-b]indol-6-carboxylic acid (8) and 3-oxo-2,3,4,6-tetrahydro-1,2,4-triazino[5,6-c]cinnoline-7-carboxylic acid (9).

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13

Yuvaraj, H., D. Gayathri, Rajesh G. Kalkhambkar, Geeta M. Kulkarni, and Rajendra M. Bapset. "8-Formyl-4-methyl-2-oxo-2H-chromen-7-yl 4-methylbenzenesulfonate." Acta Crystallographica Section E Structure Reports Online 67, no. 6 (2011): o1513. http://dx.doi.org/10.1107/s1600536811018927.

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14

Aazam, E. S., A. F. El Husseiny, H. M. Al-Amri, and Orhan Büyükgüngör. "8-[(1E)-1-(2-Aminophenyliminio)ethyl]-2-oxo-2H-chromen-7-olate." Acta Crystallographica Section E Structure Reports Online 66, no. 7 (2010): o1796. http://dx.doi.org/10.1107/s1600536810023093.

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15

D'Amico, John J., and Frederick G. Bollinger. "Synthesis of 2-oxo-3-benzothiazolineacetyl chloride (7), 5-chloro-2-oxo-3-benzothiazolineacetyl chloride (8) and derivatives." Journal of Heterocyclic Chemistry 25, no. 4 (1988): 1183–90. http://dx.doi.org/10.1002/jhet.5570250427.

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16

Sharma, Shalabh, and Kuldeep Kumar Saxena. "Synthesis and Antibacterial Activity of Azetidinonyl Norfloxacin Congeners." International Journal of Pharmaceutical Sciences and Nanotechnology 8, no. 3 (2015): 2967–71. http://dx.doi.org/10.37285/ijpsn.2015.8.3.11.

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Some novel Schiff bases and azetidinone congeners of norfloxacin have been synthesized and screened for antibacterial activity. The structures of compounds 1-ethyl-6-fluoro-7-piperazinyl-4-oxo-3-(substitutedarylidinylcarboxy- hydrazido)quinolines (2-6) and 1-ethyl-6-fluoro-7-pipera-zinyl-4-oxo-3-(3′-choloro-2′-oxo-4′-substitutedaryl-3′-aze-tidinyl)-aminocarboxy quinolines (7-11) were established by spectral and elemental analysis. The compounds 2-11 were evaluated in vitro against various strains of bacteria: E. coli ATCC 25922, B. subtilis ATCC 1633 and S. aureus ATCC 25923 to determine their

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17

Svendsen, Kristin von Hirsch, Sindre Rabben Svedahl, Christian H. Lindh, and Karin Broberg Palmgren. "Urinary 8-oxo-7, 8-dihydro-2′-deoxyguanosine concentrations after frying of bacon, a pilot study." Toxicological & Environmental Chemistry 99, no. 3 (2016): 525–34. http://dx.doi.org/10.1080/02772248.2016.1213262.

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18

Biriiac, Andrei. "Synthesis and Photooxygenation of the Methyl Ester of 11-Homodrim-6,8(9)-Diene-12-Oic Acid." Chemistry Journal of Moldova 6, no. 2 (2011): 79–83. http://dx.doi.org/10.19261/cjm.2011.06(2).17.

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Starting with the methyl 11-homodrim-8-ene-7-oxo-12-oate a two steps synthesis of methyl-11-homodrim-6,8(9)-diene-12-oate was accomplished in 87% overall yield, which on photooxygenation in the presence of tetraphenylporphyrin gave a mixture of methyl esters of 11-homodrim-7-ene-6α,9α-peroxy-12-oic and 11-homodrim-5,8-diene-7-oxo-12-oic acids 21% and 54% yields, respectively.

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19

Fasola, F., J. Anetor, K. Ajenifuja, et al. "Iron Indices and Urinary 8-Oxo-7, 8-Dihydro-2’-Deoxyguanosine (8-Oxodg) in Patients with Cervical Intraepithelial Neoplasia." British Journal of Medicine and Medical Research 7, no. 8 (2015): 678–87. http://dx.doi.org/10.9734/bjmmr/2015/16403.

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20

Al-Romaizan, Abeer N. "Behavior of 3-hydrazino-6-aryl-1,2,4-triazin-5-one as a strong nucleophile towards active electrophilic compounds and their antibacterial evaluation." Mediterranean Journal of Chemistry 9, no. 3 (2019): 279–57. http://dx.doi.org/10.13171/mjc93191014920aar.

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The behavior of 3-hydrazino-6-aryl-1,2,4-triazin-5-one towards the active electrophilic compounds in polar and/ or non-polar solvents and various times and temperatures, has been studied. N-[2-(3-(3/5-(4-Nitrophenyl)-5/3-thioxo-1H-1,2,4-triazol-1-yl)-5-oxo-1,2,4-triazin-6-yl)phenyl]pivalamides were obtained from the reaction of N-(2-(3-hydrazineyl-5-oxo-1,2,4-triazin-6-yl)phenyl)-pivalamide with 4-nitrobenzoyl isothiocyanate in THF and/ or EtOH-piperidine respectively. Also, N-(2-(3-hydrazineyl-5-oxo-1,2,4-triazin-6-yl)phenyl)-pivalamide was shown a strong nucleophilic behavior by reaction wit

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21

Yuvaraj, H., D. Gayathri, Rajesh G. Kalkhambkar, G. M. Kulkarni, and Rajendra M. Bapset. "8-[(Hydrazinylidene)methyl]-4-methyl-2-oxo-2H-chromen-7-yl 4-methylbenzenesulfonate." Acta Crystallographica Section E Structure Reports Online 67, no. 2 (2011): o323. http://dx.doi.org/10.1107/s1600536810054620.

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22

Griffiths, N., L. Sawyer, P. Taylor, et al. "cis-7-Oxo-8-oxabicyclo[4.3.0]non-2-ene-5-cis-carboxylic acid." Acta Crystallographica Section C Crystal Structure Communications 48, no. 7 (1992): 1320–22. http://dx.doi.org/10.1107/s0108270191014014.

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23

BANERJEE, A. K., and M. LAYA. "ChemInform Abstract: An Alternative Synthesis of 8-Methylene-4,4,8a-trimethyl-7-oxo-octahydronaphthalene." ChemInform 29, no. 12 (2010): no. http://dx.doi.org/10.1002/chin.199812165.

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24

Tanaka, Nobutoshi, Toshiyuki Ushioda, Hiroyuki Fuchino, and John E. Braggins. "Four New Flavan-4-ol Glycosides from Pneumatopteris pennigera." Australian Journal of Chemistry 50, no. 4 (1997): 329. http://dx.doi.org/10.1071/c96108.

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From the fronds of Pneumatopteris pennigera, four new flavan-4-ol glycosides, named pneu- matopterins A, B, C and D, were isolated. Their structures were determined as (2S,4R)-5,7-di-β-D-glucopyranosyloxy-6-hydroxymethyl-8-methylflavan-4-ol, (2S,4R)-5,7-di-β-D-glucopyranosyloxy-6,8-dimethylflavan-4-ol, (2S,4R)-5-β-D-glucopyranosyloxy-7-hydroxy-6-hydroxymethyl-8-methyl-4,2′′-oxo-flavan, and (2S,4R)-5-β-D-glucopyranosyloxy-7-hydroxy-6,8-dimethyl-4,2′′-oxo-flavan, respectively, on the basis of spectroscopic data and chemical correlations.

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25

Romo, Pablo E., Jairo Quiroga, Justo Cobo, and Christopher Glidewell. "Synthesis and spectroscopic and structural characterization of spiro[indoline-3,3′-indolizine]s formed by 1,3-dipolar cycloadditions between isatins, pipecolic acid and an electron-deficient alkene." Acta Crystallographica Section C Structural Chemistry 77, no. 9 (2021): 496–504. http://dx.doi.org/10.1107/s2053229621007142.

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Five new spiro[indoline-3,3′-indolizine]s have been synthesized with high regio- and stereospecificity in one-pot three-component reactions between a substituted indole-2,3-dione, (S)-pipecolic acid and trans-3-benzoylacrylic acid, and subsequently characterized using a combination of elemental analysis, IR and 1H and 13C NMR spectroscopy, mass spectrometry and crystal structure analysis. (1′SR,2′SR,3RS,8a′RS)-2′-Benzoyl-5-fluoro-2-oxo-1′,5′,6′,7′,8′,8a′-hexahydro-2′H-spiro[indoline-3,3′-indolizine]-1′-carboxylic acid, C23H21FN2O4, (I), and (1′SR,2′SR,3RS,8a′RS)-2′-benzoyl-5-methyl-2-oxo-1′,5′

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26

Findlay, John A., Guoqiang Li, J. David Miller, and Taiwo O. Womiloju. "Insect toxins from spruce endophytes." Canadian Journal of Chemistry 81, no. 4 (2003): 284–92. http://dx.doi.org/10.1139/v03-044.

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Extracts of fermentation cultures of a fungal endophyte (DAOM 221611) from spruce needles have afforded the known macrocyclic antibiotic vermiculin (1), 7α,8β,11-trihydroxydrimane (2), and eight novel 13-carbon γ-lactones, namely trans-3-methyldodec-cis-6-en-4-olide (3), trans-8-hydroxy-3-methyldodec-cis-6-en-4-olide (4), trans-8-acetoxy-3-methyldodec-cis-6-en-4-olide (5), trans-9-hydroxy-3-methyl-8-oxo-dodec-trans-6-en-4-olide (6), trans-8,9-dihydroxy-3-methyldodec-cis-6-en-4-olide (7), trans-9-hydroxy-8-oxo-3-methyldodecan-4-olide (8), trans-7,9-dihydroxy-3-methyl-8-oxo-dodecan-4-olide (9),

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27

Khalil, AM, MH Gagaa, and AM Alshamali. "8-Oxo-7, 8-dihydro-2′-deoxyguanosine as a biomarker of DNA damage by mobile phone radiation." Human & Experimental Toxicology 31, no. 7 (2012): 734–40. http://dx.doi.org/10.1177/0960327111433184.

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28

Harris, G., S. Bashir, and P. G. Winyard. "7, 8-Dihydro-8-oxo-2′-deoxyguanosine present in DNA is not simply an artefact of isolation." Carcinogenesis 15, no. 2 (1994): 411–13. http://dx.doi.org/10.1093/carcin/15.2.411.

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29

Hafenbradl, Doris, Martin Keller, Karl O. Stetter, Peter Hammann, Frank Hoyer, and Herbert Kogler. "Sibyllimycin, 5, 6, 7, 8-Tetrahydro-3-methyl-8-oxo-4-azaindolizidin, ein neuartiger Metabolit ausThermoactinomyces sp." Angewandte Chemie 108, no. 5 (1996): 589–91. http://dx.doi.org/10.1002/ange.19961080519.

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30

Elix, JA, JA Elix, MT Adler, MT Adler, JH Wardlaw, and JH Wardlaw. "A Further Three New Lichen Depsidones." Australian Journal of Chemistry 49, no. 10 (1996): 1175. http://dx.doi.org/10.1071/ch9961175.

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The new depsidones subnorstictic acid (1,4,10-trihydroxy-8-methyl-3,7-dioxo-1,3-dihydro-7H-isobenzofuro-[4,5-b][1,4]benzodioxepin-11-carbaldehyde) (4), decarboxyalectoronic acid [3,8-dihydroxy-1,6-di(2'-oxo-heptyl)-11H-dibenzo[ b,e ][1,4]dioxepin-11-one] (8) and di-O-methylphysodic acid [3,8-dimethoxy-11-oxo-1-(2'-oxoheptyl)-6-pentyl-11H-dibenzo[ b,e ][1,4]dioxepin-7-carboxylic acid] (15) have been identified in lichen extracts.

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31

Tang, Wanxia, Kenichi Harada, Miwa Kubo, Hideaki Hioki, and Yoshiyasu Fukuyama. "Eight New Clerodane Diterpenoids from the Bark of Ptychopetalum olacoides." Natural Product Communications 6, no. 3 (2011): 1934578X1100600. http://dx.doi.org/10.1177/1934578x1100600305.

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Eight new clerodane type diterpenoids, named 7-oxo-kolavelool (1), 7α-hydroxykolavelool (2), 6α,7α-dihydroxykolavenol (3), 12-oxo-hardwickiic acid (4), ptycholide I (5), ptycholide II (6), ptycholide III (7), and ptycholide IV (8) were isolated from the MeOH extract of the bark of a Brazilian medicinal plant, Ptychopetalum olacoides. The structures of 1–8 were elucidated by analyzing spectroscopic data and by comparing their NMR data with those of the previously reported compounds kolavelool (1a), kolavenol (3a), hardwickiic acid (4a), and ptychonolide (5a). Compounds 5 and 6 existed as a 1:1

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32

Yates, Peter, N. K. Bhamare, Thierry Granger, and T. S. Macas. "Tandem Wessely oxidation and intramolecular Diels–Alder reactions. IV. The synthesis of (±)-coronafacic acid." Canadian Journal of Chemistry 71, no. 7 (1993): 995–1001. http://dx.doi.org/10.1139/v93-132.

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Ethyl E-5-(4-ethyl-2-hydroxyphenyl)-2-pentenoate (7), prepared in four steps from m-ethylphenol (9), was converted via Wessely oxidation with lead tetraacetate followed by intramolecular Diels–Alder reaction in boiling xylene to ethyl 1-acetyloxy-6-ethyl-2,3,3a,4,5,7a-hexahydro-8-oxo-1,5-methano-1H-indene-anti-4-carboxylate (16). Hydrogenation of 16 followed by mild hydrolysis gave ethyl 6-ethyloctahydro-1-hydroxy-8-oxo-1,5-methano-1H-indene-anti-4-car-boxylate (24), which on oxidation with periodate gave 4-(ethoxycarbonyl)-6-ethyloctahydro-1-oxo-1H-indene-5-car-boxylic acid (26). Oxidative de

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33

Elix, JA, UA Jenie, and JL Parker. "A Novel Synthesis of the Lichen Depsidones Divaronic Acid and Stenosporonic Acid, and the Biosynthetic Implications." Australian Journal of Chemistry 40, no. 8 (1987): 1451. http://dx.doi.org/10.1071/ch9871451.

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The depsidones divaronic acid (24) (8-hydroxy-3-methoxy-1,6-dipropyl-11- oxo -11H- dibenzo [ b,e ][1,4]dioxepin-7-carboxylic acid) and stenosporonic acid (25) (8-hydroxy-3-methoxy-6-pentyl-l-propyl-ll-oxo-l1H-dibenzo[ b,e ][1,4]dioxepin-7-carboxylic acid) have been prepared by unambiguous synthesis, and have been shown to cooccur with colensoic acid, atranorin and chloroatranorin in the lichen Paraparmelia mongaensis. The syntheses employed a novel biomimetic-type approach which involved a Smiles rearrangement of a precursor meta-depside in the key step. This rearrangement has important biosyn

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34

Wang, Li, and Hui Li. "Methyl 1-methyl-8-nitro-5-oxo-1,2,3,5-tetrahydroimidazo[1,2-a]pyridine-7-carboxylate." Acta Crystallographica Section E Structure Reports Online 63, no. 11 (2007): o4427. http://dx.doi.org/10.1107/s1600536807051379.

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In the title compound, C10H11N3O5, the dihedral angle between the fused pyridine and imidazolidine ring planes is 4.88 (12)°. The crystal structure is stabilized by weak C—H...O intermolecular interactions.

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35

Zahra, Jalal A., Monther A. Khanfar, Mustafa M. El-Abadelah, Bassam A. Abu Thaher, Naser S. El-Abadla, and Wolfgang Voelter. "Synthesis of Some Ethyl 3-(Aryldiazenyl)-7-oxo-dihydropyrido[ 2,3-f]quinoxaline-8-carboxylates." Zeitschrift für Naturforschung B 62, no. 8 (2007): 1045–51. http://dx.doi.org/10.1515/znb-2007-0807.

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Ethyl 7,8-diamino-1-cyclopropyl-6-fluoro-4-oxo-1,4-dihydroquinoline-3-carboxylate (6) and its free acid 7 are prepared by chemical reduction of the respective 7-azido-8-nitroquinoline 5. Consecutive nucleophilic addition and cyclocondensation reactions of 6 with α-acetyl-N-arylhydrazonoyl chlorides 8a - c in ethanol and triethylamine are site-selective and yield the corresponding 3-(aryldiazinyl)- 2-methylpyrido[2,3- f ]quinoxalines 10a - c. Analytical and spectral (IR, MS, NMR) data of 6, 7, and 10a - c are in conformity with the assigned structures.

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36

Hamm, Michelle L., and Kelly Billig. "Synthesis, oligonucleotide incorporation and base pair stability of 7-methyl-8-oxo-2′-deoxyguanosine." Org. Biomol. Chem. 4, no. 22 (2006): 4068–70. http://dx.doi.org/10.1039/b612597b.

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Yu, Chu-Yi, Sheng-Jiao Yan, and Zhi-Tang Huang. "Ethyl 8-benzoyl-5-oxo-7-phenyl-1,2,3,5,6,7-hexahydroimidazo[1,2-a]pyridine-6-carboxylate." Acta Crystallographica Section E Structure Reports Online 62, no. 7 (2006): o2731—o2733. http://dx.doi.org/10.1107/s1600536806020824.

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38

Pankratov, Alexei, Olga Fedotova, Antonina Barabanova, Tatiana Alyonkina, and Yuri Eliseev. "Regioselectivity of the bromination of 1-oxo-1, 2, 3, 4-tetrahydronaphthalene and 6, 7-dimethyl-1-oxo-1, 2, 3, 4-tetrahydronaphthalene, and thiabiscyclanones synthesis on their basis." Journal of the Serbian Chemical Society 69, no. 6 (2004): 421–30. http://dx.doi.org/10.2298/jsc0406421p.

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On the basis of quantum chemical (PM3 andRHF/6-31G*) study, the regioselectivity of the bromination of 1-oxo-1,2,3,4-tetrahydronaphthalene (1) and 6,7-dimethyl-1-oxo-1,2,3,4-tetrahydronaphthalene (2) at their alicyclic and aromatic fragments was quantum chemically substantiated and confirmed experimentally. It was found that the above compounds undergo aromatic at the ?-methylene position. The conditions for bromination at the positions 5, 8 of benzannelated ring were established. For the first time non- and 2,2?-dibromosubstituted with respect to the oxo group bis(6,7-dimethyl-1-oxo-1,2,3,4-t

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39

MATSUNAGA, Tamihide, Kinya SHIBAYAMA, Shinsuke HIGUCHI, Hiroyuki TANAKA, Kazuhito WATANABE, and Ikuo YAMAMOTO. "Characterization of Microsomal Alcohol Oxygenase Catalyzing the Oxidation of 7-Hydroxy-.DELTA.8-tetrahydrocannabinol to 7-Oxo-.DELTA.8-tetrahydrocannabinol in Rat Liver." Biological & Pharmaceutical Bulletin 23, no. 1 (2000): 43–46. http://dx.doi.org/10.1248/bpb.23.43.

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40

Mahmud, Al, ME Halim, MK Ali, et al. "One pot synthesis of 2- amino-5-oxo-4-aryl-5, 6, 7, 8-tetrahydro- 4Hchromenes- 3-carboxilic acid ethyl esters." Bangladesh Journal of Scientific and Industrial Research 53, no. 1 (2018): 35–40. http://dx.doi.org/10.3329/bjsir.v53i1.35908.

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Ethyl esters of 2-cyano-3-arylacrylic acid 1a-b ( a = 3- Br- C6H4, b= 4- OH- C6H4 ) reacted with 5, 5-dimethyl-1, 3-cyclohexane (2b, R = CH3) and 1c-d (c= 3- OH- C6H4, d= 3- NO2- C6H4 ) reacted with 1, 3-cyclohexanedione (2a, R = H) and 5, 5-dimethyl-1, 3-cyclohexanedione (2b, R=CH3) in the presence of alcoholic sodium ethoxide to give the corresponding ethyl esters of 2- amino- 7, 7- dimethyl-5-oxo-4-aryl-5, 6, 7, 8-tetrahydro- 4H- chromenes-3-carboxylic acid 3a-c, 3f and 2- amino-5-oxo-4-aryl-5, 6, 7, 8-tetrahydro- 4H- chromenes-3-carboxilic acid ethyl esters 3d-e. The structures of the comp

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41

Binhamat, A., L. Bindin, MW Binsamsudin, and JA Elix. "Two New Depsidones From the Lichen Erioderma phaeorhizum Vainio sensu lato." Australian Journal of Chemistry 46, no. 1 (1993): 153. http://dx.doi.org/10.1071/ch9930153.

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The depsidones hypophysciosporin (methyl 2-chloro-3,8-dihydroxy-1,4,6,9-tetramethyl-11-oxo-11H-dibenzo[ b,e ][1,4]dioxepin-7-carboxylate) (9) and 3-O-methylhypophysciosporin (methyl 2-chloro-8-hydroxy-3-methoxy-1,4,6,9-tetra-11-oxo-11H-dibenzo[ b,e ][1,4]dioxepin-7-carboxylate)(10) have been isolated from the lichen Erioderma phaeorhizum and the structures of these metabolites have been established by comparison with synthetic material. In addition the chroman, vitamin E acetate (14), has been isolated from Erioderma tomentosum, the first reported occurrence of this compound in a lichen.

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42

Sharma, Shalabh, and Kuldeep K. Saxena. "Synthesis, Characterization and Evaluation of Azetidinylquinolines and Thiazolidinylquinolines as Antibacterial Agents." International Journal of Pharmaceutical Sciences and Nanotechnology 7, no. 3 (2014): 2536–43. http://dx.doi.org/10.37285/ijpsn.2014.7.3.5.

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Several molecules were synthesized like 8-ethoxy-4-methyl-2-amino-(3’-chloro-2’-oxo-4’-substitutedaryl-1’-azeti-dinyl)-quinolines 8-12 and 8-ethoxy-4-methyl-2-amino-(2’-substitutedaryl-4’-oxo-1’,3’-thiazolidin-3’-yl)quinolines 13-17 from 8-ethoxy-4-methyl-2-(substitutedarylidenylimino amino)-quinolines 3-7, and screened to evaluate their antibacterial activity against numerous strains of bacteria in vitro. The structures of new compounds were established on the basis of their elemental analysis, IR, 1H-NMR and mass spectral data. The results showed that three compounds 10, 11 and 16 were found

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43

Lozinski, Oleg, Tatyana Shokol, Oleg Shishkin, Vladimir Medvediev, and Vladimir Khilya. "The redeeming features of reaction of the 8-formyl-7-hydroxychromones with malononitrile." French-Ukrainian Journal of Chemistry 2, no. 1 (2014): 10–15. http://dx.doi.org/10.17721/fujcv2i1p10-15.

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A range of 4H,8H-pyrano[2,3-f]chromen-4,8-diones have been prepared using Knoevenagel reaction of the 8-formyl-7-hydroxychromones with malononitrile. The 4H,8H-pyrano[2,3-f]chromen-4,8-dione derivative was also obtained through the acid hydrolysis of the 8-imino-4H,8H-pyrano[2,3-f]chromen-4-one. 8-Formyl-7-hydroxychromone 1 was found to add two molecules of malononitrile through Michael addition resulting in formation of the 2-[8-amino-3-(4-chlorophenyl)-9-cyano-2-methyl-4-oxo-4H,10H-pyrano[2,3-f]chromen-10-yl]malononitrile.

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44

AKIHISA, Toshihiro, Wilhelmus C. M. C. KOKKE, Toshitake TAMURA, and Toshio NAMBARA. "7-Oxodihydrokarounidiol (7-Oxo-D:C-friedo-olean-8-ene-3.ALPHA.,29-diol), a Novel Triterpene from Trichosanthes kirilowii." CHEMICAL & PHARMACEUTICAL BULLETIN 40, no. 5 (1992): 1199–202. http://dx.doi.org/10.1248/cpb.40.1199.

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45

Yin, Yizhen, Shigeki Sasaki, and Yosuke Taniguchi. "Inhibitory Effect of 8-Halogenated 7-Deaza-2′-deoxyguanosine Triphosphates on Human 8-Oxo-2′-deoxyguanosine Triphosphatase, hMTH1, Activities." ChemBioChem 17, no. 7 (2016): 566–69. http://dx.doi.org/10.1002/cbic.201500589.

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46

Hinokio, Y., S. Suzuki, M. Hirai, C. Suzuki, M. Suzuki, and T. Toyota. "Urinary excretion of 8-oxo-7, 8-dihydro-2′-deoxyguanosine as a predictor of the development of diabetic nephropathy." Diabetologia 45, no. 6 (2002): 877–82. http://dx.doi.org/10.1007/s00125-002-0831-8.

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47

Lakhal, Hichem, Tarek Boudiar, Ahmed Kabouche, Zahia Kabouche, Rachid Touzani, and Christian Bruneau. "New Sesquiterpene Lactone and Other Constituents from Centaurea sulphurea (Asteraceae)." Natural Product Communications 5, no. 6 (2010): 1934578X1000500. http://dx.doi.org/10.1177/1934578x1000500603.

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Five known flavonoids (1-5) and three sesquiterpene lactones (6-8) are reported for the first time from the endemic species Centaurea sulphurea Willd. (Asteraceae). Compound 7 is a new heliangolide (6 R, 7 R, 8 S, 3' R)-8α-(3’,4’-dihydroxy-methylene-2’-butanoyloxy)-15-oxo-helianga-1(10), 4(5), 11(13)-trien-6,12-olide, named as sulphurein.

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48

Kočevar, M., S. Polanc, M. Tišler, and B. Verček. "An “One-Pot” Synthesis of Substituted 3-Benzoylamino-5-oxo-5, 6, 7, 8-Tetrahydrocoumarins." Synthetic Communications 19, no. 9-10 (1989): 1713–19. http://dx.doi.org/10.1080/00397918908051070.

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49

Al-Qawasmeh, Raed A. "Ethyl 7-chloro-1-cyclopropyl-6-fluoro-8-nitro-4-oxo-1,4-dihydroquinoline-3-carboxylate." Acta Crystallographica Section E Structure Reports Online 68, no. 8 (2012): o2533. http://dx.doi.org/10.1107/s1600536812011373.

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In the title compound, C15H12ClFN2O5, molecules are packed in the crystal lattice in a parallel fashion sustained by various C—H...O [C...O = 3.065 (5)–3.537 (5) Å] and C—H...Cl [3.431 (5)–3.735 (4) Å] interactions.

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50

Amirthasanjeevi, L., K. Ravi Kumar, and S. S. Rajan. "N-[4-(7-Methoxy-2-oxo-2H-chromen-8-yl)-2-methylbutan-2-yl]propionamide." Acta Crystallographica Section E Structure Reports Online 67, no. 9 (2011): o2518. http://dx.doi.org/10.1107/s1600536811033149.

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