Aims and Objective: A series of novel phthalazine derivatives was synthesized with versatile, readily
accessible electrophilic and nucleophilic reagents. The newly synthesized compounds were confirmed by
the results of spectroscopic measurements. Hence, their potential clinical application investigated in particular
for cancer treatment.
Materials and Methods: The newly synthesized compounds were characterized by spectroscopic measurements
and were tested for their in vitro anticancer activity by MTT assay against human liver cancer cell line.
Docking study of all the synthesized compounds was performed within the active site of the enzyme VEGFR-2
(Vascular Endothelial Growth Factor Receptor-2).
Results: The quinazoline derivative 12 emerged as the most potent compound in this study with an IC50 value
of 5.4 µM. Docking study showed that the synthesized compounds were fit in the VEGFR-2 active site almost
at the same position of sorafenib and vatalanib with comparable docking scores (-15.20 to -8.92 was kcal/mol).
Conclusion: we have synthesized a novel series of phthalazine derivatives and evaluated their potential anticancer
activity against HEPG2 cell line. The quinazoline derivative 12 emerged as the most potent compound
in this study with an IC50 value of 5.4 µM. The SAR and docking studies pointed out that rigidification of the
structure resulted in better activity and better binding within the active site of VEGFR-2 as in compounds 3, 5,
6 and 12. These results introduced new phthalazine derivatives having promising activity which could lead to
the development of more potent anticancer agents.