Application of Fe3O4@MCC Nanoparticles as a Heterogeneous Catalyst for Sustainable Multicomponent Synthesis of 2,3'‐Biindoles

Developing innovative methods for synthesizing unique 2,3'‐biindole derivatives is crucial for the progression of drug and material discovery. The use of transition‐metal‐catalyzed coupling improves the efficiency and structural diversity in the synthesis of biindoles. Among these methods, heterogeneous catalysis, particularly using Fe3O4 nanocatalyst supported by microcrystalline cellulose (MCC), is promising for green chemistry applications. In the present work, sixteen 2,3'‐biindole derivatives (4a‐p) were prepared using Fe3O4@MCC nano catalyst which demonstrated enhanced performance, cost‐effectiveness, and reusability. The magnetic properties of the catalyst enable easy separation, simplifying purification processes and enhancing overall reaction efficiency to 78‐93%. This method aligns with sustainable chemical practices and offers practical benefits for various industrial applications. This environmentally friendly method boasts several advantages and demonstrates excellent green chemistry metrics, including process mass intensity, environmental impact factor, atom economy, and reaction mass efficiency, atom economy, carbon efficiency, chemical yield and optimum efficiency.