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An efficient synthesis of 2H-indazolo[2,1-b]phthalazine-1,6,11(13H)-trione derivatives from the three-component condensation reaction of phthalhydrazide, dimedone, and aromatic aldehydes under solvent-free conditions in good to excellent yields and short reaction times using reusable silica supported poly phosphoric acid (PPA–SiO2) as heterogeneous acid catalyst has been investigated.

Reusable silica supported poly phosphoric acid catalyzed three-component synthesis of 2H-indazolo[2,1-b]phthalazine-trione derivatives