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MMT@Fe3O4 nanoparticles+Organocatalyst+Ninhydrin +Indeno[1,2-b] indolones +Multicomponent reactions

Fe3O4 magnetic nanoparticles in the layers of montmorillonite as a valuable heterogeneous nanocatalyst for the one‑pot synthesis

In the present work, iron oxide nanoparticles (
Fe3O4-NPs) were prepared using a
chemical coprecipitation method. At room temperature, Fe3O4-
NPs are put in interlamellar
space and external surfaces of montmorillonite (MMT) as a supported
solid. The MMT@Fe3O4 was characterized by X-ray diffraction (XRD), scanning
electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), vibrating
sample magnetometer (VSM), thermogravimetric analysis (TGA) and Fourier transform
infrared spectrophotometry (FT-IR). Then, indeno[1,2-b]indolone derivatives
were catalyzed by magnetic MMT@Fe3O4-NPs. MMT@Fe3O4-NPs were found
to be a recoverable organocatalyst for the effective synthesis of the indeno[1,2-b]
indolone derivatives via one-pot multicomponent cyclocondensation of ninhydrin,
1,3-diketo compound and amine derivatives in water. The significant advantages of
this method are excellent yield, mild conditions, eco-friendly catalyst, low expense,
and not using an environmentally harmful catalyst or solvent.


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