An Efficient One-Pot, Four-Component Synthesis of {[(1H-1,2,3-Triazol-4-yl)methoxy]phenyl}-1H-pyrazolo[1,2-b]phthalazine-5,10-dione Derivatives

Four-Component Synthesis of 3-Amino-1-Aryl-5,10-Dioxo-1H-Pyrazolo[1,2-b] Phthalazine-2-Carbonitrile Derivatives Promoted by Potassium Carbonate

The one-pot, four-component reaction of phthalic anhydride, hydrazine hydrate, aromatic aldehydes and malononitrile afford 3-amino-1-aryl-5,10-dioxo-1H-pyrazolo[1,2-b]phthalazine-2-carbonitrile derivatives in the presence of potassium carbonate in ethanol under reflux conditions. These conditions offer simplified operation, easy purification, excellent yields and environmentally benign reaction conditions. Also, this method avoids the use of expensive catalysts, toxic solvents and chromatographic separation.

Progress of the synthesis of condensed pyrazole derivatives (from 2010 to mid-2013)

Condensed pyrazole derivatives are important heterocyclic compounds due to their excellent biological activities and have been widely applied in pharmaceutical and agromedical fields. In recent years, numerous condensed pyrazole derivatives have been synthesized and advanced to clinic studies with various biological activities. In this review, we summarized the reported synthesis methods of condensed pyrazole derivatives from 2010 until now. All compounds are divided into three parts according to the rings connected to pyrazole-ring, i.e. [5, 5], [5,F 6], and [5, 7]-condensed pyrazole derivatives. The biological activities and applications in pharmaceutical fields are briefly introduced to offer an orientation for the design and synthesis of condensed pyrazole derivatives with good biological activities.