(α-Fe2O3)-MCM-41-SO3H as a novel magnetic nanocatalyst for the synthesis of N-aryl-2-amino-1,6-naphthyridine derivatives

► Magnetic MCM-41 simply modified with chlorosulfonic acid. ► (α-Fe2O3)-MCM-41-SO3H showed excellent acidity. ► The catalyst recovered by simple magnetic filtration without any loss of activity. ► This catalyst exhibited comparable or better activities to other sulfonic acid catalysts.