Synthesis and Characterization of Three‐Dimensional Nanocomposite as a Greatly Effective and Eco‐Friendly Heterogeneous Catalyst for the Preparation of Naphthopyranopyrimidine Derivatives as Polyaromatic Compounds

In this study, a Fe‐MOF was synthesized via a coprecipitation procedure and then used as support for stabilizing Ag ions and producing three‐dimensional cluster bud Ag 2 O@Fe‐MOF nanoflower composite (3D CB Ag 2 O@Fe‐MOF NFC) by microwave irradiation. The synthesized 3D CB Ag 2 O@Fe‐MOF NFC was applied as a heterogeneous nano‐organocatalyst in green and new preparation of naphthopyranopyrimidines via three‐component condensation of aryl aldehydes, β‐naphthol, and barbituric acids in the solvent‐free conditions at 100°C. Convenience, solvent‐free conditions, good yield, and short reaction time make this strategy a promising candidate compared to other methods. The reusability and high efficiency of this catalyst four times without any notable loss of its activity makes this strategy attractive for large‐scale eco‐friendly applications.