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Co3O4/NiO@GQDs@SO3H nanocomposite as an effective catalyst
for the synthesis of pyranopyridines

 

ABSTRACT

Co3O4/NiO@GQDs@SO3H nanocatalyst has been used as an effective
catalyst for the preparation of benzopyranopyridines through a fourcomponent
reaction of salicylaldehydes, thiols and 2 equiv of malononitrile
under reflux condition in ethanol. The catalyst has been characterized by
FT-IR, XRD, SEM, EDS, BET, XPS, TGA and VSM. Atom economy, reusable
catalyst, low catalyst loading and high yields of products are some of the
notable features of this method. The best results were gained in EtOH
and we found the convincing results for the reaction in the presence of
Co3O4/NiO@GQDs@SO3H nanocomposite (4 mg) under reflux conditions.
Also, a series of salicylaldehydes and different thiols were studied under
optimum conditions.

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