[摘要]：Regioselective syntheses of the 1-, 2-, 3-, and 4-aminoindolo[2,3-b]quinoxalines have been developed in view of the contradictory results published in the literature concerning the structure of the indoloquinoxalines obtained by condensation of isatin with an unsym. benzene-1,2-diamine. With the four derivs. in hand, isomers obtained by direct cyclocondensations starting from amino or nitro substituted benzene-1,2-diamines could be unambiguously identified. The results show that some previous findings need revision and that the 1-amino isomer could be prepd. in one step and in 58% yield.
