Iron Sulfide Catalyzed Redox/Condensation Cascade Reaction between 2‑Amino/Hydroxy Nitrobenzenes and Activated Methyl Groups: A Straightforward Atom Economical Approach to 2‑Hetaryl-benzimidazoles and -benzoxazoles

Iron sulfide generated <i>in situ</i> from elemental sulfur and iron was found to be highly efficient in catalyzing a redox/condensation cascade reaction between 2-amino/hydroxy nitrobenzenes and activated methyl groups. This method represents a straightforward and highly atom economical approach to 2-hetaryl-benzimidazoles and -benzoxazoles