Fe(OTs) 3 /SiO 2 : a novel catalyst for the multicomponent synthesis of dibenzodiazepines under solvent-free conditions

A novel heterogeneous catalyst Fe(OTs) 3 /SiO 2 was synthesized and identified using FT-IR, XRD, SEM, EDX, XRF and TG analyses. The catalyst was successfully applied as a highly effective catalyst for the synthesis of a series of dibenzodiazepines under solvent-free conditions. This protocol has the advantages of convenient one-pot operation, atom-economy, excellent yields in short reaction time, reusability of catalyst and environmental friendliness.