Green synthesis of triazolo[1,2-a]indazole-triones using Origanum majorana-capped silver nanoparticles

Abstract

A convenient, and multicomponent green procedure for the synthesis of triazolo[1,2-a]indazole-triones by the one-pot condensation reaction between 1,2,4-triazolidine-3,5-dione (urazole), 5,5-dimethylcyclohexane-1,3-dione (dimedone) and aldehydes in the presence of Origanum majorana-capped silver nanoparticles as a highly stable and reusable ecofriendly catalyst under solvent-free condition is described. Nanoparticle structure was analyzed using Fourier transform infrared (FT-IR), transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy, transport electron microscopy (TEM) isotherm, and X-ray diffraction (XRD) spectra. This procedure provides several advantages such as simple, mild condition, easy workup, and excellent yield in a short time. All of the synthesized compounds were characterized by FT-IR, ¹H NMR, ¹³C NMR, and elemental analysis.

Keywords:

• One-pot
• urazole
• dimedone
• solvent-free
• Origanum majorana-capped silver nanoparticles
• heterocycle

Acknowledgment

The author gratefully thank Islamic Azad University, Omidiyeh Branch, Omidiyeh, Iran for financial support.