A series of pyrazolo[3,4-b]pyridines has been synthesized by Friedlander condensation of 5-amino-pyrazole-4-carbaldehyde 1 with active methylene compounds in basic medium. Pyrazolo[4'3':5,6]pyrido[2,3-d]pyrimidines have been synthesized from pyrazolo[3,4-b]pyridines using substituted urea and acetic anhydride.
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Indian Inst Chem Technol, Organ Div 2, Hyderabad 500007, Andhra Pradesh, IndiaIndian Inst Chem Technol, Organ Div 2, Hyderabad 500007, Andhra Pradesh, India
Reddy, ACS
Narsaiah, B
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Indian Inst Chem Technol, Organ Div 2, Hyderabad 500007, Andhra Pradesh, IndiaIndian Inst Chem Technol, Organ Div 2, Hyderabad 500007, Andhra Pradesh, India
Narsaiah, B
Venkataratnam, RV
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Indian Inst Chem Technol, Organ Div 2, Hyderabad 500007, Andhra Pradesh, IndiaIndian Inst Chem Technol, Organ Div 2, Hyderabad 500007, Andhra Pradesh, India