Abstract
Substituted tricyclic or tetracyclic quinoxalines, tricyclic pyridoquinoxalines
and bis-quinoxalines were synthesized in
high yields starting from cyclic ketones by the α-bromination
of cyclic ketones with N -bromosuccinimide
(NBS) followed by condensation of the resulting α-bromo
ketones with 1,2-diaminobenzene, 3,4-diaminopyridine, or 3,3′-diaminobenzidine.
Key words
condensation - halogenation - tandem reactions - heterocycles - arenes
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20 CCDC 807121 (3b ),
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crystallographic data for this paper. This data can be obtained
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from the CCDC, 12 Union Road, Cambridge CB2 1EZ, UK; fax: +44(1223)336033;
e-mail: deposit@ccdc.cam.ac.uk].
