Mass Spectrometry of Substituted Ethyl-4-anilinopyrazolo[3,4-b]pyridine-5-carboxylic Acids

Samia Khakwani1,*, Samina Aslam1,2, Mehrzadi Noureen Shahi2, Tahir Maqbool3, Alice M. Rolim Bernardino4 and Misbahul Ain Khan2,5

1Department of Chemistry, Women University Multan, Multan, Pakistan

2Department of Chemistry, The Islamia University of Bahawalpur, Bahawalpur, Pakistan

3Department of Chemistry, Bahauddin Zakariya University, Multan, Pakistan

4Departamento de Quimica Organica, Instituto de Quimica, Universidade Federal Fluminense, Niteroi, RJ, 24020-150, Brazil

5Research and Development Laboratories, Shafee-Reso, Ferozepur Road, Lahore, Pakistan

*Corresponding author: E-mail:


The mass spectral fragmentation of ethyl 4-anilinopyrazolo [3,4-b]pyridine-5-carboxylic acids are presented. The fragmentation is initiated by the elimination of CO2 molecule followed by other fragments or elimination of water (m/z 18) which is then followed by successive loss of CO (m/z 28) and HCN (m/z 27).


Fragmentations, Aminopyrazoles, Pyrazolopyridines, Cyclizations.

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