Three series of 1-piperazinyl-4-phenylphthalazines 16a-k, 18a-e & 21a-g were synthesized.
The prepared phthalazines were evaluated for their inhibitory activity against VEGFR-2.
16k and 21d inhibited VEGFR-2 with IC50 = 0.35 ± 0.03 and 0.40 ± 0.04 μM, respectively.
Anticancer activity of seventeen selected compounds was screened by the NCI USA.
Compound 16k exhibited potent broad spectrum anti-proliferative activity in NCI assay.