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p-Hydroxybenzohydrazide 2 on treatment with aromatic/aliphatic aldehyde followed by cyclization with carbon disulphide afforded compounds 4a-4n. Also, compound 2 by treatment of substituted isothiocyanate followed by the treatment of chloroacetic acid yields the corresponding compounds 6a-6i. All the test compounds were assayed for antihypertensive activity by non-invasive blood pressure measurement and invasive blood pressure measurement methods. The test compounds showed significant antihypertensive activity. The intact compounds were subjected to 3D-QSAR studies. The 3D-QSAR analysis was carried out by PHASE program and a statistically reliable model with good predictive power (r(2)  = 0.98, q(2)  = 0.74) was achieved. The 3D-QSAR plots illustrated insights into the structure-activity relationship of these compounds which may aid in the design of potent p-hydroxybenzohydrazide derivatives as antihypertensive agents.

To examine new drug leads with potential anticancer activity, some (4-hydroxyphenyl)[5-substituted alkyl/aryl)-2-thioxo-1,3,4-thiadiazol-3-yl]methanone (4.a-4.c) and [-(3,4-disubstituted)-1,3-thiazol-2ylidene)]-4-hydroxybenzohydrazide (6.a-6.d) were synthesized using appropriate synthetic route. The newly prepared compounds 4.a-4.c and 6.a-6.d demonstrated inhibitory effects on the growth of a wide range of cancer cell lines especially on leukemia (HL-60), non-small lung cancer (HOP-92), renal cancer (ACHN) at the range of GI 50 -4.23 to -7.23.