Ruthenium-exchanged FAU-Y zeolite catalyzed improvement in the synthesis of 6H-indolo[2,3-b]quinolines

Ruthenium-exchanged FAU-Y zeolite (RuY) was used as a recyclable catalyst for preparation of 6H-indolo[2,3-b]quinolines from the reaction of indole-3-carbaldehyde with aryl amines in refluxing dioxane. Under the above mentioned conditions, reasonable yields of the desired products with different substituents on the quinoline ring were obtained.

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► A convenient method for preparation of indoloquinolines is reported.
► RuY as a heterogeneous catalyst resulted in more efficiency.
► Reusability of the solid acid catalyst is also, noticeable.