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Synthesis 1991; 1991(1): 83-86
DOI: 10.1055/s-1991-26387
DOI: 10.1055/s-1991-26387
paper
© Georg Thieme Verlag, Rüdigerstr. 14, 70469 Stuttgart, Germany. All rights reserved. This journal, including all individual contributions and illustrations published therein, is legally protected by copyright for the duration of the copyright period. Any use, exploitation or commercialization outside the narrow limits set by copyright legislation, without the publisher's consent, is illegal and liable to criminal prosecution. This applies in particular to photostat reproduction, copying, cyclostyling, mimeographing or duplication of any kind, translating, preparation of microfilms, and electronic data processing and storage.
Synthesis of Novel 1,2,4-Triazino[5,6-b]quinoxalines and Their Tri-N-oxides
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Publikationsverlauf
Publikationsdatum:
17. September 2002 (online)
![](https://www.thieme-connect.de/media/synthesis/199101/lookinside/thumbnails/10.1055-s-1991-26387-1.jpg)
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).