Synthesis and kinase inhibitory activity of new sulfonamide derivatives of pyrazolo[4,3-e][1,2,4]triazines

•New sulfonamide derivatives of pyrazolo[4,3-e][1,2,4]triazine described.•Single-digit micromolar inhibition of c-Abl by compounds 6c and 6e.•Potent antileukaemic activity linked to c-Abl inhibition.

A new series of sulfonamide derivatives of pyrazolo[4,3-e][1,2,4]triazine has been synthesized and characterized. Their anticancer activity was tested in vitro against multiple human cancer cell lines and were found to have dose-dependent antiproliferative effects. Furthermore, some of the new compounds inhibited the Abl protein kinase with low micromolar IC50 values and exhibited selective activity against the Bcr-Abl positive K562 and BV173 cell lines, providing starting points for the further development of this new kinase inhibitor scaffold.

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