A novel Schiff-based palladium-complex as a capable nanocatalyst for the green synthesis of hexahydroquinolines and benzochromenes

Abstract

A novel Schiff-based Pd complex (Fe3O4@SiO2@CPTES@MEL@SAL@Pd) was synthesized by modification of Fe3O4 NPs with tetraethyl orthosilicate (TEOS), 3-chloropropyltriethoxysilane (CPTES), melamine (MEL) and salicylaldehyde (SAL) and further complexation with Pd(II) and characterized by various techniques.Then, the catalytic activity of the Fe3O4-supported Schiff-based Pd complex was studied in the green one-pot multicomponent condensation reactions of: i) the aldehyde, dimedone, ethyl acetoacetate and ammonium acetate (synthesis of hexahydroquinolines) and ii) the aldehyde, malononitrile and 2-hydroxynaphthalene-1,4-dione (synthesis of benzochromenes).

Keywords

• The Schiff-based Pd-complex
• Nano-catalyst
• Multi-component reactions
• Hexahydroquinoline
• Benzochromenes