An eco-friendly synthesis of novel bis-pyran annulated heterocyclic scaffolds (4a–r) and pyran annulated heterocyclic scaffolds (4s–u) using cellulose-HClO4as a biodegradable catalyst is described.
A new, efficient and recyclable nanocatalyst, aluminatesulfonic acid, was prepared and used as a heterogeneous solid acid catalyst for the synthesis of a variety of Biginelli and Biginelli-like products under solvent-free conditions.
In the present work, sulfonic acid functionalized nanomagnetic zirconia is prepared by the reaction of (3-mercaptopropyl)trimethoxysilane and nanomagnetic zirconia.