Green Procedure for the Synthesis of Phthalazino[2,3‐b]phthalazine‐5,7,12,14‐tetraones

Abstract

Different novel phthalazino[2,3‐b]phthalazine‐5,7,12,14‐tetraones were synthesized in a simple and environmentally benign method from the reaction of phthalic anhydrides with semicarbazide or thiosemicarbazide using montmorillonite K‐10 clay as solid heterogeneous acidic catalyst and microwaves under solvent‐free conditions in good yields and short reaction times. Products were characterized by the elemental analysis, IR, NMR, and mass spectrometry.

Keywords:

• microwave
• montmorillonite K‐10 clay
• phthalic anhydrides
• semicarbazide
• solvent‐free condition
• thiosemicarbazide

Acknowledgments

Financial support from the Bu‐Ali Sina University, Hamedan, Iran, is gratefully appreciated.