Dioxovanadium(V) Complex Incorporating Tridentate ONO Donor Aminobenzohydrazone Ligand: Synthesis, Spectral Characterization and Application as a Homogeneous Lewis Acid Catalyst in the Friedlander Synthesis of Substituted Quinolines

A dioxovanadium complex has been successfully prepared by the reaction of an ONO-donor Schiff base, derived by condensing aminobenzohydrazide and 3-ethoxysalicylaldehyde, with VO2(acac)(2). The structures of synthesized products were explored spectroscopically through FT-IR, H-1 & C-13 NMR, and by elemental composition (CHN) through combustion analysis. The catalytic potential of the complex was explored for the synthesis of substituted quinolines by adapting the Friedlander method. In this method, a cyclocondensation reaction of ortho aminoaryl aldehydes or ketones was carried out with another ketone having an alpha methylene group under solvent-free conditions. The main advantages of the present catalytic work are less time required for the completion of the reaction, high percentage yield, and easy work out procedure.

Automated summary

A new dioxovanadium complex was successfully synthesized and investigated for its catalytic potential in the synthesis of substituted quinolines using the Friedlander method. The complex showed advantages of shorter reaction time, high yield percentage, and easy operation procedure.