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An efficient and practical method for the synthesis of novel fused phosphorus heterocycles incorporating diethyl phosphonate by the one-pot in the presence of Fe 3 O 4  nanoparticles as a reusable catalyst was achieved. The four-component reactions of  ortho- substituted anilines, namely 2-aminophenol, 2-aminothiophenol and 1,2-phenylenediamine with salicylaldehyde, diethyl phosphite and hexaethylphosphorus triamide in the presence of Fe 3 O 4  nanoparticles as a catalyst at 80–90 °C afforded the corresponding 1,3,2-benzo(oxaza/thiaza/diaza)phospholo[2,3- b ][1,3,2]benzoxazaphosphinines  1 – 3  in good yields (80-84%). When the same reactions were repeated by substitution of salicylaldehyde with benzaldehyde, the 1,2-benzazaphospholo[2,1- b ][1,3,2]benzo(oxaza/thiaza)phospholes  4  and  5  and 1,3,2-benzodiazaphosphole  6  derivatives were isolated in 78–83% yields. The structures of the synthesized compounds were established by elemental analysis and spectroscopic techniques (IR, MS and NMR).

Fe 3 O 4 nanoparticles as an efficient catalyst for one-pot synthesis of novel fused phosphorus heterocycles bearing diethyl phosphonate