Nano-Zn[2-boromophenylsalicylaldiminemethylpyranopyrazole]Cl<sub>2</sub>as a novel nanostructured Schiff base complex and catalyst for the synthesis of pyrano[2,3-<i>d</i>]pyrimidinedione derivatives
several techniques. Nano‐[Zn‐2BSMP]Cl2 was used as an effective catalyst for the preparation of some pyrano[2,3‐d]pyrimidinedione derivatives by the multicomponent reaction of malononitrile, aryl aldehydes and barbituric acid derivatives. The novelty and efficiency of nano‐[Zn‐2BSMP]Cl2 as a catalyst, in comparison with some other reported catalysts, for this synthetic transformation are the main features