Phospha-Michael addition of diethyl phosphite to α,β-unsaturated malonates catalyzed by nano γ-Fe2O3-pyridine based catalyst as a new magnetically recyclable heterogeneous organic base

Nano γ-Fe2O3-pyridine based catalyst as a new magnetically recyclable heterogeneous organic base was synthesized. The synthesized odorless pyridine based catalyst was used as a new catalyst for the efficient synthesis of β-phosphonomalonates by the reaction of diethyl phosphite with α,β-unsaturated malonates. The catalyst was easily isolated from the reaction mixture by a magnetic bar and reused at least 10 times without significant degradation in the activity.

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► A pyridine based catalyst supported on γ-Fe2O3 nanoparticles was synthesized.
► It was used as a recyclable catalyst for the synthesis of β-phosphonomalonates.
► β-phosphonomalonates were obtained in good to high yields.
► In this method, catalyst separation was easily performable by a magnetic bar.