Synthesis of imidazo[4,5-<i>b</i>]quinoxaline 3-oxides from reactions of furazano[3,4-<i>b</i>]quinoxaline 1-oxides with nitrones and diazo compounds
作者:John K. Gallos、Elizabeth Malamidou-Xenikaki、Pygmalion S. Lianis、Labros I. Spyrou
DOI:10.1002/jhet.5570300413
日期:1993.7
The title compounds are prepared in good yields by simple procedures from readily available starting materials. They can be easily O-methylated by methyl iodide or deoxygenated by triphenylphosphine.
Benzofuroxan () reacts with phosphorusylide to give benzimidazole derivatives and , Whereas reaction of with ylide furnishes quinoxaline via an Initial Wittig-type reaction. Similarly the reaction between the furoxano[3.4-b]quinoxalines or and the ylide yielded compounds and , respectively. In these reactions as well as in the reactions of the above furoxans with other phosphorusylides, a significant deoxygenation
Oxidation of <i>o</i>-dioxime by (diacetoxyiodo)benzene: green and mild access to furoxans
作者:Qi Zhang、Cheng Zhao、Xun Zhang、Chunlin He、Siping Pang
DOI:10.1039/d1nj05510k
日期:——
widely used in the field of high energy density materials because of its excellent properties such as high density, high standard enthalpy of formation and high nitrogen content. However, its existing synthesis methods are still restricted by the problems of difficult substrate preparation and manual handling of hazardous reagents. Herein, we disclosed a mildoxidation strategy to efficiently obtain
Synthesis of Novel 1,2,4-Triazino[5,6-<i>b</i>]quinoxalines and Their Tri-<i>N</i>-oxides
作者:John K. Gallos、Nicolaos G. Argyropoulos
DOI:10.1055/s-1991-26387
日期:——
Reaction of [1,2,5]oxadiazolo[3,4-b]quinoxaline 1-oxides with stable nitrile oxides in refluxing dichloromethane affords good yields of 1,2,4-triazino [5,6-b]quinoxaline 1,2,4-tri-N-oxides, a novel class of compounds containing the pyrazino[2,3-e]triazine skeleton and also bearing three N-oxides in the same triazine ring. The tri-N-oxides are reduced with triphenylphosphine or sodium dithionite to the corresponding 5,10-dihydro-1,2,4-triazino[5,6-b] quinoxalines, which are converted to 1,2,4-triazino[5,6-b] quinoxalines upon oxidation with iodosobenzene bis(trifluoroacetate).