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  • Title: A convenient ultrasound-promoted regioselective synthesis of fused polycyclic 4-aryl-3-methyl-4,7-dihydro-1H-pyrazolo[3,4-b]pyridines.
    Author: Nikpassand M, Mamaghani M, Shirini F, Tabatabaeian K.
    Journal: Ultrason Sonochem; 2010 Feb; 17(2):301-5. PubMed ID: 19720550.
    Abstract:
    Fused polycyclic 4-aryl-3-methyl-4,7-dihydro-1H-pyrazolo[3,4-b]pyridines were obtained in a three-component regioselective reaction of 5-amino-3-methyl-1H-pyrazole, 2H-indene-1,3-dione and arylaldehydes in ethanol under ultrasound irradiation. This rapid method produced the products in short reaction times (4-5min) and excellent yields (88-97%).
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