An alternative and environmentally benign pathway for selective synthesis of aryl-3,3′-diindolylmethanes from indole and several aromatic aldehydes is described. The electrophilic aromatic substitution (EAS) reactions are achieved with good yield and short reaction time employing infrared irradiation as energy source and a bentonitic clay as catalyst and reaction medium, in solvent-free reaction conditions.
G. Penieres-Carrillo, J. G. García-Estrada, J. L. Gutiérrez-Ramírez and C. Alvarez-Toledano, Green Chem., 2003, 5, 337 DOI: 10.1039/B211011C
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