Silver Nanoparticles Supported on Covalent Organic Framework as a Catalyst for Carboxylative Cyclization with CO₂ for Synthesis of Tetramic and Tetronic Acids

Covalent organic frameworks (COFs) serve as good heterogeneous ligands and show promise for CO 2 capture due to their persistent porosity, high surface area, fine thermal stability, and adjustable pore size. This paper describes a strategy for manufacturing tetramic and tetronic acids that makes use of a silver-based COF, Ag@TpDa, as a highly efficient and recyclable heterogeneous catalyst. There has been a spike of interest in employing metal-loaded covalent organic frameworks as reusable catalysts for the synthesis of important organic compounds in recent years. The catalytic efficiency of Ag@TpDa is investigated in the selective synthesis of tetramic and tetronic acids in the presence of 1 atm of CO 2 using unsaturated amines and alcohols as starting substrates. By integration of CO 2 into a varied variety of unsaturated amines and alcohols, the procedure provides moderate to high isolated amounts of tetramic and tetronic acids via the application of a singular catalyst. Notably, Ag@TpDa maintains consistent catalytic capability after six cycles, making it recoverable and reusable. A thorough theoretical research and accompanying tests are being conducted to determine the source of the catalyst’s remarkable selectivity.