Copper‐based MetalOrganic Frameworks as Heterogeneous Catalysts for Cross‐Dehydrogenative Coupling Reaction

Abstract

AbstractIn the present work, Cu‐based metal‐organic framework (MOF), Cu‐BDC is synthesized, characterized by powder X‐ray diffraction (XRD), infrared (IR) spectroscopy and scanning electron microscopic (SEM) techniques. After confirming the formation of Cu‐based MOFs (Cu‐BDC), the catalytic performance of Cu‐BDC is studied in the cross dehydrogenative coupling between 2‐oxindole and malononitrile using dimethylformamide (DMF) as solvent under air atmosphere at 80 °C to afford 98 % yield of the desired product. Further, catalyst reusability is also studied and observing no significant decrease up to third recycles. Cu‐BDC is also active in promoting the coupling between 2‐oxindole derivatives with malononitrile under identical conditions with higher yields of the expected product. A suitable mechanism is also proposed for this transformation.