the synthesis of mono and 2,3-disubstitutedquinoxalines by using a AlCl3 induced (hetero)arylation of 2,3-dichloroquinoxaline. Both symmetrical and unsymmetrical 2,3-disubstitutedquinoxalines can be prepared conveniently by using this method under appropriate reaction conditions. The reaction proceeds via C–C bond formation and can be utilized for the preparation of a variety of quinoxaline derivatives
Metal-free TFA promoted arylation/heteroarylation was achieved under mild conditions via the reaction of chloro-derivatives of nitrogen heterocycles [e. g., =C−C(Cl)=N−] with electronrich arenes/heteroarenes. It was also observed that apart from participating in the heteroarylation step, TFA was able to facilitate the hydroarylation/o-arylation process in the same pot affording the carbazole/oxepine