Results 251 to 260 of about 26,379 (326)

Alkynyl- and dialkynyl-quinoxalines. Synthesis of condensed quinoxalines

Journal of the Chemical Society, Perkin Transactions 1, 1980
Condensation of 2-chloro- and 2,3-dichloro-quinoxalines with alk-1-ynes in the presence of bis(triphenylphosphine)palladium(II) dichloride and copper(I) iodide gives mono- and di-alkynylquinoxalines. Addition of amines to these products gives stable enamines; hydration gives 2′-oxoalkyl compounds which exist predominantly in the intramolecularly ...
M. Ismail Brohi, Donald E. Ames
openaire   +2 more sources

Photoinduced Cyclizations of o-Diisocyanoarenes with Organic Diselenides and Thiols that Afford Chalcogenated Quinoxalines.

Journal of Organic Chemistry, 2020
This study describes the syntheses of 2,3-bis(selanyl)quinoxalines via the photoinduced cyclizations of o-diisocyanoarenes with diaryl or dialkyl diselenides, in addition to providing a detailed discussion of the corresponding mechanism, and revealing ...
Cong Chi Tran, S. Kawaguchi, F. Sato, A. Nomoto, A. Ogawa   +4 more
semanticscholar   +1 more source

NaOH-Mediated Direct Synthesis of Quinoxalines from o-Nitroanilines and Alcohols via a Hydrogen-Transfer Strategy.

Journal of Organic Chemistry, 2020
A NaOH-mediated sustainable synthesis of functionalized quinoxalines is disclosed via redox condensation of o-nitroamines with diols and α-hydroxy ketones.
Yan-Bing Wang, Linlin Shi, Xiaojie Zhang, Lian-Rong Fu, Weinan Hu, Wenjing Zhang, Xinju Zhu, Xinqi Hao, Mao‐Ping Song   +8 more
semanticscholar   +1 more source

Direct Synthesis of Pyrrolo[1,2-α]quinoxalines via Iron-Catalyzed Transfer Hydrogenation between 1-(2-Nitrophenyl)pyrroles and Alcohols.

Journal of Organic Chemistry, 2020
Herein, we describe novel iron-catalyzed transfer hydrogenation between alcohols and 1-(2-nitrophenyl)pyrroles for the synthesis of pyrrolo[1,2-α]quinoxalines.
Simin Chun, Jiwon Ahn, Ramachandra Reddy Putta, Seokwoo Lee, D. Oh, Suckchang Hong   +5 more
semanticscholar   +1 more source

Structures of quinoxaline antibiotics

Acta Crystallographica Section B Structural Science, 1995
The crystal structures of three quinoxaline antibiotics-echinomycin 2QN, triostin C and the C222(1) form of triostin A--have been determined, and the structure of the P2(1)2(1)2(1) form of triostin A has been re-refined against our previously reported data. The molecular conformations are compared with those deduced from NMR data and those reported for
Karen Schmidt-Bäse, E. F. Paulus, Ehmke Pohl, Andreas Heine, Peter G. Jones, George M. Sheldrick, Michael J. Waring   +6 more
openaire   +3 more sources

Pyrrolo[1,2-a]quinoxalines based on quinoxalines (Review)

Chemistry of Heterocyclic Compounds, 2010
Published data on methods for the synthesis of pyrrolo[1,2-a]quinoxalines, based on derivatives of quinoxalines and also on compounds that are not initially derivatives of quinoxalines or pyrroles are summarized and classified.
Alexey A. Kalinin, Vakhid A. Mamedov
openaire   +2 more sources

Hydrogen Auto‐transfer Synthesis of Quinoxalines from o‐Nitroanilines and Biomass‐based Diols Catalyzed by MOF‐derived N,P Co‐doped Cobalt Catalysts

, 2020
A Co‐based heterogeneous catalyst supported on N,P co‐doped porous carbon (Co@NCP) is prepared via a facile in‐situ doping‐carbonization method. The Co@NCP composite features a large surface area, high pore volume, high‐density and strong basic sites ...
K. Sun, Dan-Dan Li, Guo-ping Lu, C. Cai
semanticscholar   +1 more source

Quinoxaline-Bridged Porphyrinoids

Journal of the American Chemical Society, 2002
Quinoxaline-bridged porphyrinoids (3), the first macrocycles containing dipyrrolylquinoxaline (DPQ, 1) subunits, were synthesized from the condensation of the diformyl-substituted DPQ derivatives (2) and 1,8-diaminoanthracene. The resulting structures were confirmed by X-ray analyses, which showed encapsulation of CHCl(3) molecules within the columnar ...
Hiroyuki Furuta, Hiromitsu Maeda, Hiromitsu Maeda, Hiromitsu Maeda, Toshihisa Mizuno, Jonathan L. Sessler, Vincent M. Lynch   +6 more
openaire   +3 more sources

Synthesis of fused quinoxalines

Mendeleev Communications, 2002
AbstractFor Abstract see ChemInform Abstract in Full Text.
Mikhail I. Kodess, Michail G. Ponizovsky, Oleg N. Chupakhin, Valery N. Charushin, Artem M. Boguslavsky   +4 more
openaire   +3 more sources

Visible-light induced phosphonation of quinoxalines and quinoxalin-2(1H)-ones under aerobic metal-free conditions

, 2020
Phosphonation of quinoxalines and quinoxalin-2(1H)-ones utilizing aerobic oxygen as green oxidant under visible light conditions at room temperature has been described.
D. Rawat, Rahul Kumar, A. Subbarayappa
semanticscholar   +1 more source