Abstract
Two new series of pyrazoles and bipyrazoles were synthesized, and their structures were elucidated according to all data results from spectral and elemental analyses. The pathway of the formation of the new bipyrazole derivatives was discussed. Further, all the synthesized derivatives were screened for their antitumor activity on human lung (A‐549) and hepatocellular cancer (HepG‐2) cell lines. The results of antitumor screening have exhibited that several derivatives are more potent than the reference drug.