BF₃ bonded nano Fe₃O₄ (BF₃/MNPs): an efficient magnetically recyclable catalyst for the synthesis of 1,4-dihydropyrano[2,3-c]pyrazole derivatives

Abstract

1,4-Dihydropyrano[2,3-<italic>c</italic>]pyrazole derivatives were efficiently synthesized in a simple one-pot three-component reaction of various aldehydes with malononitrile and a 2-pyrazoline-5-one in the presence of BF₃/MNPs as a novel nanostructured, heterogeneous and reusable catalyst.