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 CO2 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 CO2 using unsaturated amines and alcohols as starting substrates. By integration of CO2 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.