Synthesis and Application of MOF(Fe)-TUR as a New H-Bond Catalyst for Synthesis of New Nicotinonitriles and Chromeno[4,3- b ] Pyridines

The development of targeted catalysts for environmental applications in the synthesis of biological compounds can be incredibly important. In the last few years, many catalysts have been reported that are potentially developable at the current time. In this research, Fe-based MOF as a bed and thiourea functionalities were constructed on it via a post-modification method. This method introduced the MOF(Fe)-TUR catalyst with hydrogen bonding ability, which selectively catalyzes the synthesis of new nicotinonitriles as well as chromeno[4,3-b]pyridine derivatives with good yields (70%–85%), suitable temperature (100 °C), easy purification and easy catalyst separation. The last step of the reaction process occurred via a cooperative vinylogous anomeric based oxidation. The structure of MOF(Fe)-TUR as a new H-bond catalyst was confirmed using several techniques such as FT-IR, XRD, XPS, SEM, EDX, Elemental mapping, BET, and BJH. The structure of the synthesized products was evaluated and confirmed by melting point, FT-IR, 1H-NMR, and 13C-NMR techniques. The novelty of this work lies in the development of a green and mild synthetic route and making MOF(Fe)-TUR as an environmentally friendly catalyst. Additionally, recycle and reusability of the presented catalyst are other advantages of the described methodology.