Catalytic Application of Functionalized Bimetallic–Organic Frameworks with Phosphorous Acid Tags in the Synthesis of Pyrazolo[4,3-e]pyridines

[Image: see text] Combining two different metals for the synthesis of a metal–organic framework (MOF) is a smart strategy for the architecture of new porous materials. Herein, a bimetal–organic framework (bimetal–MOFs) based on Fe and Co metals was synthesized. Then, phosphorous acid tags were decorated on bimetal–MOFs via a postmodification method as a new porous acidic functionalized catalyst. This catalyst was used for the synthesis of pyrazolo[4,3-e]pyridine derivatives as suitable drug candidates. The present study provides new insights into the architecture of novel porous heterogeneous catalysts based on a bimetal–organic framework (bimetal–MOFs). The type of final structures of catalyst and pyrazolo[4,3-e]pyridine derivatives were determined using different techniques such as fourier transform infrared (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray (EDX), SEM-elemental mapping, N(2) adsorption–desorption isotherm, Barrett–Joyner–Halenda (BJH), thermogravimetry/differential thermal analysis (TG/DTA), (1)H NMR, and (13)C NMR.