Abstract
An efficient and simple method for the synthesis of aliphatic and aromatic 1H-indazolo[2,1-b]phthalazinetrione derivatives through a one-pot three-component condensation of phthalhydrazide, aldehyde, and dimedone in the presence of boron sulfonic acid as a reusable and efficient catalyst under solvent-free conditions is described. The reusability of catalyst, good to excellent yields, short reaction times, and the avoidance of harsh reagents are the main advantages of this method. .
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