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6904802 
Journal Article 
REGIOSELECTIVE SYNTHESES OF 1-, 2-, 3- AND 4-AMINOINDOLO[2,3-b]QUINOXALINES 
Jaouen, A; Helissey, P; Desbene-Finck, S; Giorgi-Renault, S; , 
2008 
Yes 
Heterocycles
ISSN: 0385-5414 
PERGAMON-ELSEVIER SCIENCE LTD 
OXFORD 
75 
11 
2745-+ 
English 
WOS:000261352200010 
In view of the contradictory results published in the literature concerning the structure of the indoloquinoxalines obtained by condensation of isatin with an unsymmetrical benzene-1,2-diamine, regioselective syntheses of the 1-, 2-, 3-, and 4-aminoindolo[2,3-b]quinoxalines have been developed. With the four derivatives in hand, isomers obtained by direct cyclocondensations starting from amino or nitro substituted benzene-1,2-diamines could be unambiguously identified. The results of these studies show, on the one hand, that some previous findings need revision and, on the other hand, that the I-amino isomer could be prepared in one step and in 58% yield.