Magnetic CoFe2O4 nanoparticle immobilized N-propyl diethylenetriamine sulfamic acid as an efficient and recyclable catalyst for the synthesis of amides via the Ritter reaction

• CoFe2O4 nanoparticle immobilized diamine-N-sulfamic acid was prepared.
• Excellent activity for the synthesis of amides via the Ritter reaction was observed.
• The catalyst could be easily recovered by magnetic separation.
• The catalyst was reused several times without significant loss of activity.

A magnetic CoFe2O4 nanoparticle immobilized diamine-N-sulfamic acid (CoFe2O4@SiO2–DASA) was synthesized and used as efficient heterogeneous catalyst for the synthesis of amides via the Ritter reaction under solvent-free conditions. The magnetic nanocatalyst could be readily recovered by applying an external magnet and recycled several times without considerable loss of its catalytic activity.

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