A simple and efficient protocol for the formylation of amines with ammonium formate with excellent yields catalyzed by Fe3O4 nanoparticles in PEG-400 is described. Notably, this method shows excellent activity and chemoselectivity for the formylation of primary and secondary arylamines. Moreover, the nano-Fe3O4 catalyst and PEG-400 could be easily recovered and reused.
