Abstract
Silica sulfuric acid as an efficient and reusable heterogeneous catalyst have been used for the preparation of 2 H -indazolo[2,1- b ]phthalazine-1,6,11(13 H )-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. Silica sulfuric acid as an efficient and reusable heterogeneous catalyst have been used for the preparation of 2 H -indazolo[2,1- b ]phthalazine-1,6,11(13 H )-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.
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