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Synthesis of 9-substituted-1,4,5,8-tetraazaphenanthrenes

✍ Scribed by Raymonde Nasielski-Hinkens; Marie Benedek-Vamos; Daniel Maetens

Book ID
112126065
Publisher
Journal of Heterocyclic Chemistry
Year
1980
Tongue
English
Weight
298 KB
Volume
17
Category
Article
ISSN
0022-152X

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Synthesis and NMR Spectra of Substituted
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## Abstract The synthesis of ring A substituted TAP'S starts from 5,6‐diaminoquinoxaline (II), which is condensed with n‐butylglyoxylate to give a mixture of 2‐ and 3‐hydroxy‐TAP, which reacted with POCl~3~/PCl~5~ to afford the corresponding monochlorocompound. Similarly, the condensation of II and

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## Abstract The ^13^C NMR spectra of 1,4,5,8‐tetraazaphenanthrene (pyrazino[2,3‐__f__] quinoxaline), eleven of its derivatives [2‐ and 3‐chloro, ‐methoxy and ‐(1′‐piperidino), 2,3‐dichloro, ‐dimethoxy, ‐dimethyl and ‐di(1′‐piperidino) and 9‐methoxy] and of 1,4,5,8,9,12‐hexaazatriphenylene (dipyrazi