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.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (95 K)Download as PowerPoint slideHighlights► 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.