Ni@Zeolite-Y Nano-Porous: Preparation and Application as a High Efficient Catalyst for Facile Synthesis of Quinoxaline, Pyridopyrazine, and Indoloquinoxaline Derivatives

In this research, by a simple and modified method, nanoporous of Ni(II) ion loaded Y-type zeolite (NNZ) was designed and applied as a novel highly efficient catalyst for the synthesis of quinoxalines, pyrido[2,3-b]pyrazines, and indolo[2,3-b]quinoxalines 3a-s. These heterocycles were obtained through a one-pot condensation reaction of aryl-1,2-diamines with 1,2-diketones or the isatin in the presence of the catalytic amount of Ni@zeolite-Y in ethanol or acetic acid at room temperature giving good to excellent yield. The structure of entitled catalyst was identified with FT-IR spectroscopy, Energy Dispersive X-ray (EDX), Scanning Electron Microscopy (SEM) and Brunauer-Emmett-Teller (BET) analysis. This method has some advantages such as the use of inexpensive, safety, stable and recyclable catalyst, high yields, short reaction times, and easy isolation of the product. It can be claimed that this approach in simplicity covers the goals of green chemistry.