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A new, convenient, and efficient method for the synthesis of 1 H -pyrazolo[1,2- b ]phthalazine-5,10-diones is developed starting from phthalhydrazide, aromatic aldehydes, and malononitrile using 4- N , N -dimethylaminopyridin as catalyst. This modified route provides much higher yields and a simple work-up procedure of products. Also this methodology is of interest due to the use of ethanol as a solvent without use of any toxic metals as catalyst, thus minimizing the cost, the operational hazards, and environmental pollution.

DMAP as a new efficient catalyst for the one-pot synthesis of condensed phthalazines