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Journal articles on the topic '3-b]quinoxaline'

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Published: 24 April 2022

Last updated: 30 July 2025

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1

Sonawane, Amol D., Atsushi Shimozuma, Taro Udagawa, Masayuki Ninomiya, and Mamoru Koketsu. "Synthesis and photophysical properties of selenopheno[2,3-b]quinoxaline and selenopheno[2,3-b]pyrazine heteroacenes." Organic & Biomolecular Chemistry 18, no. 21 (2020): 4063–70. http://dx.doi.org/10.1039/d0ob00718h.

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Novel synthesis of 2-arylselenopheno[2,3-b]quinoxaline, 3-(aryl/alkylselanyl)-2-arylselenopheno[2,3-b]quinoxaline and 6-phenyl-7-(arylselanyl)selenopheno[2,3-b]pyrazine derivatives, from the corresponding 2,3-dichloroquinoxaline and 2,3-dichloropyrazine derivatives.

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2

Besharati-Seidani, Tayebeh, Ali Keivanloo, Babak Kaboudin, and Tsutomu Yokomatsu. "Efficient synthesis of 2-phenyl-3-substituted furo/thieno[2,3-b]quinoxalines via Sonogashira coupling reaction followed by iodocyclization and subsequent palladium-catalyzed cross-coupling reactions." RSC Advances 6, no. 87 (2016): 83901–8. http://dx.doi.org/10.1039/c6ra15425e.

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In this paper, we report the successful synthesis of new 2-phenyl-3-substituted furo/thieno[2,3-b]quinoxaline derivatives from 2-chloro-3-methoxyquinoxaline and 2-chloro-3-(methylthio)quinoxaline by a three-step approach.

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3

Anothane, Caleb Ahoya, and El Mokhtar Essassi. "2-(3-thienyl)-2,3-dihydrofuro[2,3-b]quinoxaline." Molbank 2007, no. 2 (2007): M536. http://dx.doi.org/10.3390/m536.

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4

Wang, Xinye, Yuan Wu, Chuan Ming Wu, et al. "Dibenzo[f,h]furo[2,3-b]quinoxaline-based molecular scaffolds as deep blue fluorescence materials for organic light-emitting diodes." New Journal of Chemistry 46, no. 1 (2022): 419–25. http://dx.doi.org/10.1039/d1nj04934h.

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A novel molecular scaffold, dibenzo[f,h]furo[2,3-b]quinoxaline (3,6-bis(4-isopropylphenyls)-11-phenyldibenzo[f,h]furo[2,3-b]quinoxaline (dP-diBFQ) and furo[2′,3′:5,6]pyrazino[2,3-f][1,10]phenanthroline, were designed, for pure and deep blue emission. OLEDs based on dP-diBFQ shows pure blue emission with CIE coordinates of (0.154, 0.102) and an EQE of 2.28%.

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5

Kovrizhina, Anastasia R., Elizaveta I. Samorodova, and Andrei I. Khlebnikov. "11H-Indeno[1,2-b]quinoxalin-11-one 2-(4-ethylbenzylidene)hydrazone." Molbank 2021, no. 4 (2021): M1299. http://dx.doi.org/10.3390/m1299.

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11H-Indeno[1,2-b]quinoxaline derivatives present an important type of nitrogen-containing heterocyclic compound that are useful intermediate products in organic synthesis and have potential pharmaceutical applications. A new 11H-indeno[1,2-b]quinoxalin-11-one-2-(4-ethylbenzylidene)hydrazone (compound 3) was synthesized. Compound 3 is the first example of an azine derivative based on the 11H-indeno[1,2-b]quinoxaline system. The Z,E-isomerism of compound 3 was investigated by DFT calculations. Bioavailability was evaluated in silico using ADME predictions. According to the ADME results, compound

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6

Ammar, Y. A., M. S. A. El-gaby, M. A. Zahran, and A. A. Abdel-salam. "SOME REACTIONS WITH 6-BENZOYL-3-AMINO-2-IMINO-2,3- DIHYDROTHIAZOLO[4,5-b]QUINOXALINE: SYNTHESIS OF (1,2,4) TRIAZOLO[3′,2′:2,3]THIAZOLO[4,5-b] QUINOXALINE AND (1,3,4)THIADIAZINO [5,6-b]QUINOXALINE DERIVATIVES." Phosphorus, Sulfur, and Silicon and the Related Elements 157, no. 1 (2000): 87–95. http://dx.doi.org/10.1080/10426500008040514.

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7

El-Sawy, Eslam, Fatma Bassyouni, Sherifa Abu-Bakr, Hanaa Rady, and Mohamed Abdlla. "Synthesis and biological activity of some new 1-benzyl and 1-benzoyl-3-heterocyclic indole derivatives." Acta Pharmaceutica 60, no. 1 (2010): 55–71. http://dx.doi.org/10.2478/v10007-010-0004-0.

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Synthesis and biological activity of some new 1-benzyl and 1-benzoyl-3-heterocyclic indole derivativesStarting from 1-benzyl- (2a) and 1-benzoyl-3-bromoacetyl indoles (2b) new heterocyclic, 2-thioxoimidazolidine (4a, b), imidazolidine-2,4-dione (5a, b), pyrano(2,3-d)imida-zole (8a, band9a, b), 2-substituted quinoxaline (11a, b-17a, b) and triazolo(4,3-a)quinoxaline derivatives (18a, band19a, b) were synthesized and evaluated for their antimicrobial and anticancer activities. Antimicrobial activity screening performed with concentrations of 0.88, 0.44 and 0.22 μg mm-2showed that 3-(1-substitute

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8

Y., A. AMMAR, M. ISMAIL I., M. SH. EL-SHARIEF A., A. MOHAMED Y., and M. AMER R. "Synthesis of some Newer Thiazolo and Thiadiazino Derivatives from 6-Methyl- or 6-Nitro-2,3-dichloroquinoxalines." Journal of Indian Chemical Society Vol. 66, Feb 1989 (1989): 124–27. https://doi.org/10.5281/zenodo.6303632.

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Chemistry Department, Faculty of Science, Al-Azhar University, Nasr City, Cairo, Egypt <em>Manuscript received 23 October 1987, revised 18 August 1988, accepted 18 November 1988</em> lnteraction or 6-methyl or 6-nitro-2,3-dichloroquinoxaline (1a, b) with thiourea in ethanol led to the formation or diquinoxalino[2,3-<em>b</em>: 2',3'-<em>e</em>]-1,4-dithiien derivatives (2a, b) with 2-imino-2,3-dihydrothiazolol [4,5-<em>b</em> ]quinoxalines (3a, b). 7-Methyl- or 7- nitro-3-amino-2-imino-2,3-dihydrothiazolo[4,5-<em>b</em>]quinoxaline (6a, b) were prepared and reacted with acid

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9

Lassagne, Frédéric, Timothy Langlais, Elsa Caytan, et al. "From Quinoxaline, Pyrido[2,3-b]pyrazine and Pyrido[3,4-b]pyrazine to Pyrazino-Fused Carbazoles and Carbolines." Molecules 23, no. 11 (2018): 2961. http://dx.doi.org/10.3390/molecules23112961.

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2,3-Diphenylated quinoxaline, pyrido[2,3-b]pyrazine and 8-bromopyrido[3,4-b]pyrazine were halogenated in deprotometalation-trapping reactions using mixed 2,2,6,6-tetramethyl piperidino-based lithium-zinc combinations in tetrahydrofuran. The 2,3-diphenylated 5-iodo- quinoxaline, 8-iodopyrido[2,3-b]pyrazine and 8-bromo-7-iodopyrido[3,4-b]pyrazine thus obtained were subjected to palladium-catalyzed couplings with arylboronic acids or anilines, and possible subsequent cyclizations to afford the corresponding pyrazino[2,3-a]carbazole, pyrazino[2′,3′:5,6] pyrido[4,3-b]indole and pyrazino[2′,3′:4,5]p

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10

Peters, Karl, Eva-Maria Peters, Hans Georg von Schnering, Gert Kollenz, Ewald Terpetschnig, and Walter Ott. "Crystal structure of a mixed crystal containing 3-benzoyl-2-phenyl-furo[2,3-b]quinoxaline and 3-benzoyl-2-phenyl-thieno[2,3-b]quinoxaline." Zeitschrift für Kristallographie 177, no. 3-4 (1986): 301–6. http://dx.doi.org/10.1524/zkri.1986.177.3-4.301.

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11

Sumby, Christopher J. "Ruthenium(II) Complexes of New Chelating Indolizino[2,3-b]pyrazine- and Indolizino[2,3-b]quinoxaline-Derived Ligands: Syntheses, Electrochemistry and Absorption Spectroscopy." Australian Journal of Chemistry 61, no. 11 (2008): 894. http://dx.doi.org/10.1071/ch08339.

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The highly conjugated chelating ligands 5-(2-pyridyl)indolizino[2,3-b]pyrazine 1, 5-(2-pyridyl)indolizino[2,3-b]quinoxaline 2, and 8,9-dimethyl-5-(2-pyridyl)indolizino[2,3-b]quinoxaline 3 were prepared in one step, with good yields, from di-2-pyridylmethane and 2,3-dichloropyrazine, 2,3-dichloroquinoxaline, and 8,9-dimethyl-2,3-dichloroquinoxaline, respectively. Compounds 1–3 display long-wavelength absorption maxima in the green (1) and yellow (2 and 3) to give intensely coloured red and purple solutions, respectively. Bis(2,2′-bipyridyl)ruthenium(ii) and bis(4,4′-dimethyl-2,2′-bipyridyl)ruth

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12

Nikumbh, Satish P., Akula Raghunadh, T. Srinivasa Rao, et al. "A cascade reaction for the new and direct synthesis of indolofuroquinoxalines." RSC Advances 6, no. 28 (2016): 23489–97. http://dx.doi.org/10.1039/c6ra03556f.

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13

M., A. El-Sekily, H. Mancy S., and Kh. El-Sekely M. "Synthesis and characterisation of triazolo- and pyrazol-3-yl quinoxaline derivatives from dehydro-L-ascorbic acid hydrazone and their antimicrobial activity." Journal of India Chemical Society Vol. 95, Jun 2018 (2018): 641–49. https://doi.org/10.5281/zenodo.5642875.

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Department of Chemistry, Faculty of Science, University of Alexandria, Ibrahimia, P.O.Box 426, 21321 Alexandria, Egypt E-mail: prof_dr_m_a_elsekily@yahoo.com Department of Physics and Chemistry, Faculty of Education, University of Alexandria, El-Chatby, Alexandria, Egypt Department of Chemistry, Faculty of Science, Alexandria University, Egypt <em>Manuscript received 08 February 2018, revised 14 February 2018, accepted 29 May 2018</em> The 4-(pyrazol-3-yl)[1,2,4]triazolo[4,3-a]quinoxaline derivatives 4a-c were prepared by the reaction of 2-chloro-3-[5- (acetoxymethyl)-1-phenylpyrazol-3-yl]quin

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14

JAG, MOHAN, S. R. ANJANEYULU G., and V. S. YAMINI K. "Heterocyclic Systems containing Bridgehead Nitrogen Atom : Synthesis and Antimicrobial Activity of s-Triazolo[3,4-b][1,3,4]thiadiazoles, s-Triazolo[3',4'-b] [1,3.4]thiadiazines and s-Triazolo[3',4' : 2,3][1,3,4]thiadiazino[5,6-b]quinoxaline." Journal of Indian Chemical Society Vol. 68, Aug 1991 (1991): 474–76. https://doi.org/10.5281/zenodo.6197084.

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Department of Chemistry, Mabarshi Dayanand University, Rohtak-124 001 <em>Manuscript received 11 June 1990, revised 12 December 1990, accepted 5 August 1991</em> Heterocyclic Systems containing Bridgehead Nitrogen Atom : Synthesis and Antimicrobial Activity of s-Triazolo[3,4-b][1,3,4]thiadiazoles, s-Triazolo[3',4'-b] [1,3.4]thiadiazines and s-Triazolo[3',4' : 2,3][1,3,4]thiadiazino[5,6-b]quinoxaline.

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15

Huang, Tai-Hsiang, Wha-Tzong Whang, Yuh-Sheng Wen, and Jiann T. Lin. "2-Phenyl-3-[6-(3-phenylquinoxalin-2-yl)dibenzo[b,d]thiophen-3-yl]quinoxaline." Acta Crystallographica Section E Structure Reports Online 61, no. 12 (2005): o4236—o4237. http://dx.doi.org/10.1107/s1600536805037700.

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16

Gallos, John K., Elizabeth Malamidou-Xenikaki, Pygmalion S. Lianis, and Labros I. Spyrou. "Synthesis of imidazo[4,5-b]quinoxaline 3-oxides from reactions of furazano[3,4-b]quinoxaline 1-oxides with nitrones and diazo compounds." Journal of Heterocyclic Chemistry 30, no. 4 (1993): 917–19. http://dx.doi.org/10.1002/jhet.5570300413.

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17

Bovio, B. "Crystal and molecular structure of 1-oxo-3-propoxyazepino[7,6-b]quinoxaline." Acta Crystallographica Section A Foundations of Crystallography 43, a1 (1987): C167. http://dx.doi.org/10.1107/s0108767387080991.

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18

Vijayakumar, B., D. Gavaskar, T. Srinivasan, R. Raghunathan, and D. Velmurugan. "3′-Ferrocenylcarbonyl-1′-methyl-4′-phenylspiro[indeno[2,3-b]quinoxaline-11,2′-pyrrolidine]." Acta Crystallographica Section E Structure Reports Online 68, no. 11 (2012): m1382—m1383. http://dx.doi.org/10.1107/s1600536812042468.

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19

Vijayakumar, B., A. R. Sureshbabu, D. Gavaskar, R. Raghunathan, and D. Velmurugan. "4-Ferrocenyl-1-methyl-3-benzoylspiro[pyrrolidine-2,11′-indeno[1,2-b]quinoxaline]." Acta Crystallographica Section E Structure Reports Online 68, no. 12 (2012): m1576—m1577. http://dx.doi.org/10.1107/s1600536812048349.

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20

GALLOS, J. K., E. MALAMIDOU-XENIKAKI, P. S. LIANIS, and L. I. SPYROU. "ChemInform Abstract: Synthesis of Imidazo(4,5-b)quinoxaline 3-Oxides from Reactions of Furazano(3,4-b)quinoxaline 1-Oxides with Nitrones and Diazo Compounds." ChemInform 25, no. 8 (2010): no. http://dx.doi.org/10.1002/chin.199408231.

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21

JAG, MOHAN, S. R. ANJANBYULU G., and KIRAN. "Heterocyclic Systems containing Bridgehead Nitrogen Atom. Synthesis of Thiadiazolo[2',3', : 2,1 )imidazo[ 4,5-b)quinoxaline, Jmidazo[2,1-b ]-1,3,4-thiadiazoles and their Brominated Products." Journal of Indian Chemical Society Vol. 66, Feb 1989 (1989): 118–19. https://doi.org/10.5281/zenodo.6303535.

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Department of Chemistry, Maharshi Dayanand University, Rohtak-124 001 <em>Manuscript received 25 March 1988, accepted 2 November 1988</em> 2-Amino-5-alkylthiadiazoles (1) condense with \(\propto\)-haloketones and 2,3-dichloroquinoxalene to furnish respectively the cyclised products, 2,6-disubstituted imidazo [2,1-b]-1,3,4-thiadiazoles (2) and 2-substituted-thiadiazolo(2<em>',</em>3<em>'</em>: 2,1] imidazo[4,5-b]- quinoxaline (4). Bromination of 2 furnishes 5-bromo-2,6-disubstituted-imidazo[2,1-b]- thiadiazoles (3). The antimicrobial activities of some of the compounds have be

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22

Ozawa, Tomohiro, Y. Kishi, K. Miyamoto та ін. "Syntheses and Luminescent Behavior of π-Extended [Ru(bpy)₃]²⁺ Derivatives through Triple Hydrogen Bonds as an Organic-Inorganic Hybridized Material". Advanced Materials Research 11-12 (лютий 2006): 277–80. http://dx.doi.org/10.4028/www.scientific.net/amr.11-12.277.

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Two new bipyridine derivative ligands with an extended π electron system and a triple hydrogen bond group, 2,4-diaminopyrimido[5,6-b]dipyrido[2,3-f:2’,3’-h]quinoxaline (DAPQ) and 2,4(1H,3H)-pyrimidinedion[5,6-b]dipyrido[2,3-f:2’3’-h]quinoxaline (PDPQ), were synthesized in order to construct high-performance Ru(II) complexes. The two Ru(II) complexes composed of dapq or pdpq and two 2,2’-bipyridine (BPY) ligands showed characteristic luminescent spectra with a peak maximum at ca. 610 nm. The octahedral Ru(II) complexes with a D-A-D (D: proton donor; A: proton acceptor) type triple hydrogen bond

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23

Bovio, Bruna. "Crystal and molecular structure of 1-oxo-3-propoxyazepino[7,6-b]quinoxaline, C15H13N3O2." Journal of Crystallographic and Spectroscopic Research 17, no. 5 (1987): 575–84. http://dx.doi.org/10.1007/bf01167115.

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24

EI-Bendary, E. R., F. E. Goda, A. R. Maarouf, and F. A. Badria. "Synthesis and antimicrobial evaluation of 3-hydrazino-quinoxaline derivatives and their cyclic analoaues." Scientia Pharmaceutica 72, no. 2 (2004): 175–85. http://dx.doi.org/10.3797/scipharm.aut-04-15.

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A series of quinoxaline derivatives has been synthesized by reacting 3-hydrazinoquinoxalines 1a,b with many bifunctional reagents. Reaction of 1a,b with chloroacetyl chloride and ethyl chloroacetate afforded 1-chloromethyl[1,2,4]tnazoIo[4,3-a]quinoxalines 2a,b and dihydro[1,2,4]triazino[4,3-a]quinoxalin-2-ones 3a,b respectively. Condensation of 1a,b with ethyl acetoacetate and acetylacetone yielded 2-quinoxalinylhydrazonobutanoates 4a,b and 2-quinoxalinylhydrazono-2-pentanones 5a,b respectively. Cyclization of 5a,b gave 3,5-dimethylpyrazolylquinoxalines 6a,b. Moreover, reaction of compounds 2a

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25

Perfetti, Gracia A. "Determination of Heterocyclic Aromatic Amines in Process Flavors by a Modified Liquid Chromatographic Method." Journal of AOAC INTERNATIONAL 79, no. 3 (1996): 813–16. http://dx.doi.org/10.1093/jaoac/79.3.813.

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Abstract A liquid chromatographic method for determining heterocyclic aromatic amines (HAAs) was modified so that it can be used to quantitate the following 5 HAAs in complex process flavors: 2-amino-3-methylimidazo[4,5-f]quinoline (IQ); 2-amino-3,4-dimethylimidazo[4,5-f]quinoline (MelQ); 2-amino-3,8-dimethylimidazo[4,5-f]quinoxaline (MelQx); 2-amino-3,4,8-trimethylimidazo[4,5-f]quinoxaline (diMelQx); and 2-amino-1-methyl-6-phenylimidazo[4,5-b]pyridine (PhIP). By changing the initial extraction procedure, PhIP recovery improved from 35 to 87%. An additional cleanup step using ion-exchange soli

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26

Gauvreau, D., I. E. Swift, and M. J. Waring. "Studies on antibiotic biosynthesis by protoplasts and resting cells of Streptomyces echinatus. Part II. Effect of chromophore precursors." Canadian Journal of Microbiology 32, no. 5 (1986): 363–72. http://dx.doi.org/10.1139/m86-071.

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Washed cell and protoplast suspensions from Streptomyces echinatus A8331, which produces the quinoxaline antibiotic echinomycin, have been used to study the effects of analogues of the natural chromophore upon antibiotic biosynthesis. Addition of quinoline-2-carboxylic acid caused a decrease in the labelling of echinomycin from L-[methyl-14C]methionine and an increase in labelled chloroform-extractable material. Quinoxaline-2-carboxylic acid increased the incorporation of radioactivity into both fractions. Thieno[3,2-b]pyridine-5-carboxylic acid, 6-methylquinoline-2-carboxylic acid, and quinol

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27

Bazié, Bazoin Sylvain Raoul, Adjima Bougma, Aminata Séré, et al. "Assessment of heterocyclic aromatic amines contents in flamed and braised chicken in Burkina Faso." PLOS ONE 17, no. 12 (2022): e0278712. http://dx.doi.org/10.1371/journal.pone.0278712.

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The nutritional status of meat is tarnished by its association with the induced cooking contaminants. The aim of this study was to assess the heterocyclic aromatic amines profile and contents in processed chicken in Burkina Faso. Eight polar and apolar heterocyclic aromatic amines (HAAs) including 2-mino-3-methylimidazo[4,5-f]quinolone (IQ), 3-amino-1,4-dimethyl-5H-pyrido[4, 3-b]indole (Trp-P1), 3-amino-1-methyl-5H-pyrido[4,3-b]indole (Trp-P2), 2-mino-9H-pyrido-[2,3-b]indole (AαC), 2-amino-1-methyl-6-phenylimidazo[4, 5– ]pyridine (PhIP), 2-amino-3-methyl-9H-pyrido[2,3-b] indole (MeAαC), 2-amin

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28

Nagalakshmi, R. A., J. Suresh, K. Malathi, R. Ranjith Kumar, and P. L. Nilantha Lakshman. "Crystal structure of 1′,1′′-dimethyl-4′-(4-cholorophenyl)dispiro[11H-indeno[1,2-b]quinoxaline-11,2′-pyrrolidine-3′,3′′-piperidin]-4′′-one." Acta Crystallographica Section E Crystallographic Communications 71, no. 2 (2015): o68—o69. http://dx.doi.org/10.1107/s2056989014027698.

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In the title compound, C30H27ClN4O, the central pyrrolidine ring adopts an envelope conformation with the methylene C atom being the flap. The quinoxaline and indane rings are each essentially planar, with r.m.s. deviations of 0.027 (1) and 0.0417 (1) Å, respectively. The pyrrolidine ring forms dihedral angles of 88.25 (1) and 83.76 (1)° with the quinoxaline and indane rings, respectively. A weak intramolecular C—H...N interaction is observed. In the crystal, C—H...π interactions lead to supramolecular chains along [101] that assemble in theacplane. Connections along thebaxis are of the type C

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29

Abu-Hashem, Ameen Ali, and Sami A. Al-Hussain. "Design, Synthesis of New 1,2,4-Triazole/1,3,4-Thiadiazole with Spiroindoline, Imidazo[4,5-b]quinoxaline and Thieno[2,3-d]pyrimidine from Isatin Derivatives as Anticancer Agents." Molecules 27, no. 3 (2022): 835. http://dx.doi.org/10.3390/molecules27030835.

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The current work aims to design and synthesis a new series of isatin derivatives and greatly enhances their cytotoxic activity. The derivatives 3-((bromophenyl) imino)-1-(morpholino (pyridine) methyl) indolin-2-one, 2-((oxoindoline) amino) benzoic acid, 3-(thiazolo-imino) indolinone, ethyl-2-((oxoindolin-3-ylidene)amino)-benzothiophene-3-carboxylate, 1-(oxoindoline)-benzo[4,5] thieno [2,3-d]pyrimidin-4(1H)-one, ethyl-2-(2-oxoindoline) hydrazine-1-carboxylate, N-(mercapto-oxo-pyrimidine)-2-(oxoindoline) hydrazine-1-carboxamide, N-(oxo-thiazolo[3,2-a] pyrimidine)-2-(oxoindolin-ylidene) hydrazine

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30

Ren, Demin, Xiaolian Hu, Yulin Huang, and Xiaofang Li. "Synthesis of Dispiro[Indeno[1,2-b]Quinoxaline-11,3′-Pyrrolizine-2′,2″-[1,3] Thiazolo[3,2-a]Pyrimidine Via Cycloaddition Reactions." Journal of Chemical Research 42, no. 9 (2018): 453–55. http://dx.doi.org/10.3184/174751918x15349264445767.

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The 1,3-dipolar cycloaddition reaction of ethyl 5-aryl-2-(2-methoxy-2-oxoethylidene)-7-methyl-3-oxo-2,3-dihydro-5 H-[1,3]thiazolo[3,2- a] pyrimidine-6-carboxylate and azomethine ylide, which was generated in situ by the reaction of 11 H-indeno[1,2- b]quinoxalin-11-one and L-proline, afforded novel 6″ethyl 1′-methyl 5″aryl-7″methyl-3″oxo-5’,6’,7’,7a′-tetrahydro-1' H,3″ H,5″ H-dispiro[indeno[1,2- b]quinoxaline-11, 3 ‘-pyrrolizine-2’,2″-[1,3]thiazolo[3,2- a]pyrimidine-1’,6″-dicarboxylates in good yields. The structures of all the products were characterised thoroughly by NMR, IR and HRMS together

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31

JAG, MOHAN, S. R. ANJANBYULU G. та KIRAN. "Heterocyclic Systems containing Bridgehead Nitrogen Atom. Synthesis of Thiadiazolo[2ʹ3′: 2,1]imidazo[4,5-b]quinoxaline, Iiniclazo[2, 1 -b)]-1,3,4-thiadiazoles and their Brominated Products". Journal of Indian Chemical Society Vol. 66, Feb 1989 (1989): 118–19. https://doi.org/10.5281/zenodo.5995035.

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Department of Chemistry, Maharshi Dayanaud University, Rohtak-121 001 <em>Manuscript received 28 March 1988, accepted 2 November 1988</em> <strong>2-Amino-5-alkylthiadiazoles (1) condense with \(\propto\)-haloketones and 2,3-dichioro</strong><strong>quinoxalene to furnish respectively the cyclised </strong><strong>products, 2,6-disubstituted imidazo [2,1-b]-1,3,4-thiadiezoles (2) </strong><strong>and 2-substituted-thiadiazolo[2</strong><strong>ʹ</strong><strong>,3</strong><strong><sup>′</sup></strong><strong> : 2,1]imidazo[4,5-b<sup>1</sup>- quinoxaline (4). Bromination of 2 </stron

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32

Sadykhov, Gusein A., Danila V. Belyaev, Ekaterina E. Khramtsova, et al. "4-Alkyl-4H-thieno[2′,3′:4,5]pyrrolo[2,3-b]quinoxaline Derivatives as New Heterocyclic Analogues of Indolo[2,3-b]quinoxalines: Synthesis and Antitubercular Activity." International Journal of Molecular Sciences 26, no. 1 (2025): 369. https://doi.org/10.3390/ijms26010369.

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The synthetic approach based on a sequence of Buchwald–Hartwig cross-coupling and annulation through intramolecular oxidative cyclodehydrogenation has been used for the construction of novel 4-alkyl-4H-thieno[2′,3′:4,5]pyrrolo[2,3-b]quinoxaline derivatives. For the first time, these polycyclic compounds were evaluated for antimycobacterial activity, including extensively drug-resistant strains. A reasonable bacteriostatic effect against Mycobacterium tuberculosis H37Rv was demonstrated. A plausible mechanism for antimycobacterial activity of heterocyclic analogues of indolo[2,3-b]quinoxalines

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33

JAG, MOHAN, S. R. ANJANBYULU G., and KIRAN. "Heterocyclic Systems containing Bridgehead Nitrogen Atom. Synthesis of Thiadiazolo[2′,3′: 2,1]imidazo[4,5-b]quinoxaline, Iiniclazo[2, 1 -1)]-1,3,4-thiadiazoles and their Brominated Products." Journal of Indian Chemical Society Vol. 66, Feb 1989 (1989): 118–19. https://doi.org/10.5281/zenodo.5959418.

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Department of Chemistry, Maharshi Dayanaud University, Rohtak-121 001 <em>Manuscript received 28 March 1988, accepted 2 November 1988</em> <strong>2-Amino-5-alkylthiadiazoles (1) condense with\(\propto\)-haloketones and 2,3-dichioro</strong><strong>quinoxalene to furnish respectively the cyclised </strong><strong>products, 2,6-disubstituted imidazo [2,1-b]-1,3,4-thiadiezoles (2) </strong><strong>and 2-substituted-thiadiazolo2</strong><strong>ʹ</strong><strong>,3</strong><strong><sup>′</sup></strong><strong> : 2,1]imidazo[4,5-b</strong><strong>ʹ</strong><strong>- quinoxaline (4). Bro

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34

Suresh, J., R. A. Nagalakshmi, K. Malathi, R. R. Kumar, and P. L. N. Lakshman. "1′,1′′-Dimethyl-4′-phenyldispiro[11H-indeno[1,2-b]quinoxaline-11,2′-pyrrolidine-3′,3′′-piperidin]-4′′-one." Acta Crystallographica Section E Structure Reports Online 69, no. 9 (2013): o1433. http://dx.doi.org/10.1107/s160053681302223x.

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35

Banekovich, Christian, Kurt Mereiter, and Barbara Matuszczak. "Pyrazolo[2′,3′:3,4][1,3]oxazino[5,6-b]quinoxaline, a novel tetracyclic ring system." Tetrahedron Letters 44, no. 51 (2003): 9161–64. http://dx.doi.org/10.1016/j.tetlet.2003.10.043.

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36

Leng, Xinyu, Chengguo Liu, and Fei Ye. "Synthesis, Crystal Structure and Biological Activity of Two Triketone-Containing Quinoxalines as HPPD Inhibitors." Acta Chimica Slovenica 69, no. 4 (2022): 779–86. http://dx.doi.org/10.17344/acsi.2022.7516.

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Two new triketone-containing quinoxaline derivatives were designed by fragment splicing strategy and synthesized using 3,4-diaminobenzoic acid and substituted cyclohexanedione as starting materials. Both compounds were characterized by IR, 1H and 13C NMR, HRMS and X-ray diffraction. 3-Hydroxy-5-methyl-2-(quinoxaline-6-carbonyl)cyclohex-2-en-1-one (6a) crystallized in the triclinic system, space group Pī, a = 7.9829(2) Å, b = 8.1462(2) Å, c = 10.7057(3) Å, α = 84.3590(10)°, β = 89.7760(10)°, γ = 87.4190(10)°, Z = 2, V = 692.12(3) Å3, F(000) = 296, Dc = 1.335 Mg/m3, μ(MoKα) = 0.095 mm–1, R = 0.0

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37

Hossain, Mohammad M., Noor N. Ferdous, Md Hasan Muhib, et al. "The Effect of Deactivating Groups in the Formation of Some Biologically Important Lactams (Isatins) and their Further Derivatization." Journal of the Bangladesh Chemical Society 25, no. 1 (2012): 46–52. http://dx.doi.org/10.3329/jbcs.v25i1.11771.

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Treatment of different aromatic primary amines (7a-b) with chloral hydrate andhydroxylamine hydrochloride under microwave (MW) conditions afforded correspondingisonitrosoacetanilides (6a-b). These intermediate compounds (6a-b) were cyclized inconc. H2SO4 medium to give cyclic amides (5a-b) by means of elcetrophilicaromatic substitution reaction. The microwave (MW) mediated treatment of compound5a with thiosemicarbazide afforded the corresponding Schiff-base 4a, which undergoescyclization to give thiadiazoline (1). Beside, compound 4a was also treated with aq KOHsolution under MW condition to g

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38

S., S. EL-MORSY, A. FADDA A., and S. EL-HOSSINI M. "Synthesis and Antimicrobial Activity of some New Thiazolo-, Quinoxalino-, Piperidino- and Naphthatriazino- coumarins." Journal of Indian Chemical Society Vol. 65, Oct 1988 (1988): 699–701. https://doi.org/10.5281/zenodo.6076858.

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Department of Chemistry, Faculty of Science, Mansoura University, Mansoura, Egypt <em>Manuscript received 31 March 1987, revised 5 May 1988, accepted 8 July 1988</em> Various derivatives from 3-acetylcoumarin are prepared: aminothiazole (9), coumarilic acid ( )<em>, </em>piperidone (12), quinoxaline (14) and naphthatriazine (15). Active methylene compounds react with the arylidene (2a, b) to give the cyclohexanone derivatives (4a, b, respectively). SeO<sub>2</sub> on reaction with 1 gives the  <em>α</em>, <em>β</em> -diketon (13) which reacts with hydrazine to give 18

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39

Kartseva, T. V., G. S. Predvoditeleva, O. N. Oleshko, V. I. Shvedov, L. N. Filitis, and G. N. Pershin. "Pyridazinoquinoxalines. 10. Synthesis and antitubercular activity of 3-hydrazino derivatives of pyridazino [3,4-b] quinoxaline." Pharmaceutical Chemistry Journal 23, no. 11 (1989): 909–11. http://dx.doi.org/10.1007/bf00764619.

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40

Kim, Ho Sik, Yoshihisa Kurasawa, and Atsushi Takada. "A selective synthesis of 1-aryl-3-quinoxalinyl-1,2,4-triazole and furo[2,3-b]quinoxaline." Journal of Heterocyclic Chemistry 26, no. 4 (1989): 1129–33. http://dx.doi.org/10.1002/jhet.5570260442.

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41

Koyioni, Maria, and Panayiotis A. Koutentis. "The Reaction of 6-(4-Chloro-5H-1,2,3-dithiazol-5-ylidene)-4-methylcyclohexa-2,4-dien-1-one with Benzene-1,2-diamine: Synthesis and Chemistry of N-(2-Aminophenyl)-2-hydroxy-5-methylbenzimidoyl Cyanide." Synlett 31, no. 05 (2019): 482–86. http://dx.doi.org/10.1055/s-0039-1690246.

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(Z)-6-(4-Chloro-5H-1,2,3-dithiazol-5-ylidene)-4-methylcyclohexa-2,4-dien-1-one, readily prepared from 4,5-dichloro-1,3,4-dithiazolium chloride and p-cresol, reacts with benzene-1,2-diamine to give N-(2-aminophenyl)-2-hydroxy-5-methylbenzimidoyl cyanide. The latter, in acidic media, cyclizes to give, depending on the reaction conditions, 2-methylbenzofuro[2,3-b]quinoxaline, 2-(1H-benzo[d]imidazol-2-yl)-4-methylphenol or 2-(3-aminoquinoxalin-2-yl)-4-methylphenol.

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42

Rajendran, Rajam, and Yoshiyuki Ohta. "Binding activity of Natto (a fermented food) and Bacillus natto isolates to mutagenic-carcinogenic heterocyclic amines." Canadian Journal of Microbiology 47, no. 10 (2001): 935–42. http://dx.doi.org/10.1139/w01-094.

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The fermented food, whole meal Natto, viscous polymeric material from Natto, Natto bean, cooked soya bean, and 28 bacterial isolates from Natto were studied for their binding capacity to foodborne mutagenic-carcinogenic heterocyclic amines. The mutagenic heterocyclic amines used were Trp-P-1 (3-amino-1,4-dimethyl-5H-pyrido(4,3-b)indole); Trp-P-2 (3-amino-1-methyl-5H-pyrido(4,3-b)indole); Glu-P-1 (2-amino-6-methyldipyrido(1,2-a:3'2'-d)imidazole); PhIP (2-amino-1-methyl-6-phenylimidazo(4,5-b)pyridine); IQ (2-amino-3-methylimidazo(4,5-f)quinoline); MeIQ (2-amino-3,4-dimethylimidazo(4,5-f)quinoxal

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43

P., S. FERNANDES, and M. SONAR T. "Studies on Potential Antitubercular Agents. Synthesis of 1-(2' -Morpholino-3'-quinoxalinoyl)-2-benzalhydrazine and 2-Aryl-3-(2'-morpholino-3'-quinoxalimido)-4-thiazolidinones." Journal of Indian Chemical Society Vol. 65, Jan 1988 (1988): 46–48. https://doi.org/10.5281/zenodo.6023783.

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N. S. Research Laboratories, St. Xavier's College, Bombay-400 001 <em>Manuscript received 7 October 1986, revised 27 August 1981, accepted 30 October 1981</em> Ethyl-2-hydroxyquinoxaline-3- carboxylate with phosphorous oxy- chlorude gave ethyl-2-chloro-quinoxaline-3-carboxylate. This compound upon treatment with morpholine gave ethyl-2-morpholinoquinoxaline-3- carboxylate (A). The ester (A) with hydrazine hydrate (99%) gave the corresponding carboxyhydrazide (B). This carboxyhydrazide when reacted with various aryl aldehyde yielded the corresponding Schiff bases, 1-(3'-

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44

Chandralekha, Kuppan, Adukamparai Rajukrishnan Sureshbabu, Deivasigamani Gavaskar, and Srinivasakannan Lakshmi. "Crystal structure of methyl 3′-benzamido-4′-(4-methoxyphenyl)-1′-methylspiro[indeno[1,2-b]quinoxaline-11,2′-pyrrolidine]-3′-carboxylate." Acta Crystallographica Section E Crystallographic Communications 72, no. 9 (2016): 1257–59. http://dx.doi.org/10.1107/s2056989016012469.

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In the title compound, C35H30N4O3, the spiro C atom connects the five-membered pyrrolidine ring and the indenoquinoxaline ring system. The pyrrolidine ring adopts a twist conformation. An intramolecular N—H...N interaction between the amino group and the pyrazine ring is observed. In the crystal, molecules are linked by a pairs of C—H...O hydrogen bonds, forming inversion dimers.

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45

Nagalakshmi, R. A., J. Suresh, K. Malathi, R. Ranjith Kumar, and P. L. N. Lakshman. "1′,1′′-Dimethyl-4′-(4-methylphenyl)dispiro[11H-indeno[1,2-b]quinoxaline-11,2′-pyrrolidine-3′,3′′-piperidin]-4′′-one." Acta Crystallographica Section E Structure Reports Online 69, no. 9 (2013): o1466. http://dx.doi.org/10.1107/s1600536813022964.

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46

Boraei, Ahmed T. A., Ahmed A. M. Sarhan, Sammer Yousuf, and Assem Barakat. "Synthesis of a New Series of Nitrogen/Sulfur Heterocycles by Linking Four Rings: Indole; 1,2,4-Triazole; Pyridazine; and Quinoxaline." Molecules 25, no. 3 (2020): 450. http://dx.doi.org/10.3390/molecules25030450.

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A new series of nitrogen and sulfur heterocyclic systems were efficiently synthesized by linking the following four rings: indole; 1,2,4-triazole; pyridazine; and quinoxaline hybrids. The strength of the acid that catalyzes the condensation of 4-amino-5-(1H-indol-2-yl)-2,4-dihydro-3H-1,2,4-triazole-3-thione 1 with aromatic aldehydes controlled the final product. Reflux in glacial acetic acid yielded Schiff bases 2–6, whereas concentrated HCl in ethanol resulted in a cyclization product at C-3 of the indole ring to create indolo-triazolo-pyridazinethiones 7–16. This fascinating cyclization appr

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47

Moghaddam, Firouz Matloubi, Atiyeh Moafi, Behzad Jafari, Alexander Vilinger, and Peter Langer. "Regio- and Diastereoselective Synthesis of Novel Polycyclic Pyrrolo[2,1-a]isoquinolines Bearing Indeno[1,2-b]quinoxaline Moieties by a Three-Component [3+2]-Cycloaddition Reaction." Synlett 31, no. 03 (2019): 267–71. http://dx.doi.org/10.1055/s-0039-1690768.

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A regio- and diastereoselective synthesis of 2,3-dihydro-10b′H-spiro[indeno[1,2-b]quinoxaline-11,1′-pyrrolo[2,1-a]isoquinoline]-2′,3′-diylbis(phenylmethanone) derivatives containing four contiguous chiral stereocenters was achieved through 1,3-dipolar cycloaddition of isoquinolinium N-ylides in a one-pot three-component reaction. The desired products were obtained in short reaction times and in moderate to high yields (up to 92%) under relatively mild reaction conditions. The structure and relative stereochemistry of the desired product was confirmed by X-ray diffraction analysis.

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Wang, Ruihu, Maochun Hong, Weiping Su, Rong Cao, Yingjun Zhao, and Jiabao Weng. "Syntheses and Crystal Structures of Silver(I) Organosulfur Polymers as One-Dimensional Chains." Australian Journal of Chemistry 56, no. 11 (2003): 1167. http://dx.doi.org/10.1071/ch01130.

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Two silver(I) organosulfur coordination polymers, {[Ag2(mbpsq).dmf](NO3)2}n (1) and {[Ag3(bpsp)2(CH3CN)]-(BF4)3.2 H2O}n (2), were prepared by self-assembly of silver(I) with the chelating heterocyclic ligands mbpsq and bpsp (mbpsq = 2,3-bis[2-(4-methylpyrimidinyl)methylsulfanyl]-quinoxaline; bpsp = 2,6-bis[(2-pyrimidinyl)-methylsulfanyl]-pyridine). Single-crystal X-ray diffraction analysis reveals that (1) crystallizes in the triclinic space group P1– with a 10.1937(8), b 11.2160(9), c 13.8445(11) Å, α 103.0620(10), β 106.4850(10), γ; 96.2720(10)°, V 1452.8(2) Å3, Z 2. Each mbpsq molecule acts

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Karpenko, O. S., O. О. Boyko, М. О. Shibinskaya, N. А. Kutuzova, and S. А. Lyakhov. "SYNTHESIS AND DNA AFFINITY OF 1-DIALKYLAMINO-3- INDOLO [2,3-b] QUINOXALINE-6-YLPROPAN-2-OLS." Odesa National University Herald. Chemistry 23, no. 3(67) (2018): 40–49. http://dx.doi.org/10.18524/2304-0947.2018.3(67).140799.

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T.Waghmode, Krishnakant. "Microwave assisted synthesis of pharmacologically active N-phenyl acetamide derivatives of indolo [2, 3-b] quinoxaline." IOSR Journal of Pharmacy (IOSRPHR) 2, no. 1 (2012): 105–8. http://dx.doi.org/10.9790/3013-0210105108.

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