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

Abstract

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, ¹H & ¹³C 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 Friedländer 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.

Keywords:

• Dioxovanadium(V) complex
• Friedländer reaction
• homogeneous catalysis
• quinoline
• solvent-free conditions
• tridentate Schiff base

Acknowledgment

We gratefully acknowledge the practical support of this study by Ardakan University and Payame Noor University.

Disclosure statement

No potential conflict of interest was reported by the author(s).