Results 21 to 30 of about 25,177 (318)

Alkoxyallene‐Based LANCA Three‐Component Synthesis of 1,2‐Diketones, Quinoxalines, and Unique Isoindenone Dimers and a Computational Study of the Isoindenone Dimerization [PDF]

open access: yes, 2020
A series of β‐alkoxy‐β‐ketoenamides was prepared by the well‐established LANCA three‐component reaction of lithiated 1‐(2‐trimethylsilylethoxy)‐substituted allenes, nitriles, and α,β‐unsaturated carboxylic acids.
Bera M. K.   +6 more
core   +1 more source

Scope of tetrazolo[1,5-a] quinoxalines in CuAAC reactions for the synthesis of triazoloquinoxalines, imidazoloquinoxalines, and rhenium complexes thereof [PDF]

open access: yes, 2022
The conversion of tetrazolo[1,5-a]quinoxalines to 1,2,3-triazoloquinoxalines and triazoloimidazoquinoxalines under typical conditions of a CuAAC reaction has been investigated.
Bräse, Stefan   +4 more
core   +2 more sources

Quinoxaline-2-carbonitrile [PDF]

open access: yesActa Crystallographica Section E Structure Reports Online, 2009
In the title compound, C9H5N3, the quinoxaline ring is essentially planar, with a maximum deviation of 0.012 (1) Å. Short inter­molecular distances between the centroids of the 2,3-dihydro­pyrazine and benzene rings [3.6490 (5) Å] indicate the existence of π⋯π inter­actions.
Hoong‐Kun Fun   +4 more
openaire   +3 more sources

A Dual-Protein Cascade Reaction for the Regioselective Synthesis of Quinoxalines.

open access: yesOrganic Letters, 2020
In this work, an efficient dual-protein (lipase and hemoglobin) system was successfully constructed for the regioselective synthesis of quinoxalines in water. A set of quinoxalines were obtained in high yields under optimal reaction conditions. This dual-
Fengxi Li   +6 more
semanticscholar   +1 more source

Nucleophilic Substitution on 2-Monosubstituted Quinoxalines Giving 2,3-Disubstituted Quinoxalines: Investigating the Effect of the 2-Substituent

open access: yesMolecules, 2016
An investigation on the effect of substituent at the 2-position of mono-substituted quinoxalines in the synthesis of di-substituted quinoxaline derivatives via nucleophilic substitution reactions, is reported.
Ndumiso Thamsanqa Ndlovu   +1 more
doaj   +1 more source

Natural vs. synthetic phosphate as efficient heterogeneous compounds for synthesis of quinoxalines [PDF]

open access: yes, 2021
Natural phosphate (NP) and synthetic fluorapatite phosphate (SFAP) were proposed as stable, inexpensive, readily available and recyclable catalysts for the condensation of 1,2-diamines with 1,2-dicarbonyls in methanol to afford quinoxaline at room ...
Amini, Abbas (R17786)   +5 more
core   +1 more source

Biotransformation of quinoxaline by Streptomyces badius [PDF]

open access: yesLetters in Applied Microbiology, 1996
Quinoxaline, a mutagenic azaarene produced in foods during cooking, was added to cultures of Streptomyces badius ATCC 39117. After 24 h, the cultures were extracted with ethyl acetate. Two major metabolites were purified by liquid chromatography and identified by mass spectrometry and nuclear magnetic resonance spectroscopy as 3,4-dihydro-2(1H ...
Sutherland, J. B.   +3 more
openaire   +4 more sources

Biomass into chemicals: One-pot two- and three-step synthesis of quinoxalines from biomass-derived glycols and 1,2-dinitrobenzene derivatives using supported gold nanoparticles as catalysts [PDF]

open access: yes, 2012
An efficient and selective one-pot two-step method, for the synthesis of quinoxalines by oxidative coupling of vicinal diols with 1,2-phenylenediamine derivatives, has been developed by using gold nanoparticles supported on nanoparticulated ceria (Au ...
Climent Olmedo, María José   +5 more
core   +1 more source

Induction of Cell Death in Human A549 Cells Using 3-(Quinoxaline-3-yl) Prop-2-ynyl Methanosulphonate and 3-(Quinoxaline-3-yl) Prop-2-yn-1-ol

open access: yesMolecules, 2019
Despite major advancements in the development of various chemotherapeutic agents, treatment for lung cancer remains costly, ineffective, toxic to normal non-cancerous cells, and still hampered by a high level of remissions.
Mixo Aunny Sibiya   +5 more
doaj   +1 more source

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