(?-Fe 2O 3)-MCM-41-SO 3H as a novel magnetic nanocatalyst for the synthesis of N-aryl-2-amino-1,6-naphthyridine derivatives

Abstract

The new (?-Fe 2O 3)-MCM-41-SO 3H catalyst was prepared directly through the reaction of chlorosulfonic acid with silica-coated nanoparticles (?-Fe 2O 3)-MCM-41 and used as a magnetically recyclable catalyst for an efficient one-pot synthesis of N-aryl-2-amino-1,6-naphthyridine derivatives. The catalyst with 10 wt% of loaded iron oxide nanoparticles could be recovered from the reaction mixture by an external magnet and reused without significant decrease in activity even after 5 runs. This new prepared catalyst exhibited better activities to other commercially available sulfonic acid catalysts. é 2011 Elsevier B.V. All rights reserved.