Abstract
Herein, first example of heterogeneously catalyzed carbonylative synthesis of bis(indolyl)methanes from aryl iodides in one-pot and single-step manner has been reported. The reaction was best catalyzed by polystyrene supported bimetallic Pd-Au (Pd-Au@PS) nanoparticles (NPs) in comparison to various supported monometallic Pd-catalysts. The key feature of this protocol involves the application of oxalic acid as economic, solid, and safe multi-functional reagent which acts as a CO, H2 source as well as acid co-catalyst with PEG-200 as green solvent reaction medium for delivering moderate to excellent yields of the desired products, bis(indolyl)methanes (BIMs). The developed protocol is additive, phosphine ligand-free under air/moisture stable recyclable catalyst bearing easy accessibility/affordability to starting materials.
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