Abstract
The synthetic strategies and characterization of some novel derivatives of 3-methyl-2-(4-substituted phenyl)-4,5-dihydronaphtho[1,2-c]pyrazoles carrying different pharmacophores and heterocyclic rings that are relevant to potential antitumour and cytotoxic activities are described. The antitumour activities of the newly synthesized compounds were evaluated according to the protocol of the National Cancer Institute (NCI) in-vitro disease-oriented human cells screening panel assay. The results revealed that six compounds, namely 6, 8, 11, 15, 17 and 18; displayed promising in-vitro antitumour activity in the 60-cell lines assay. The sulfonylthioureido group emerged as the most favourable pharmacophore. Incorporating such thioureido counterpart into the 6-membered 1,3-thiazinan-5-one resulted in better antitumour activities than those displayed by the 5-membered thiazoles and the 6-membered 1,3-thiazinan-4-one ring systems. Further ring expansion led to a total loss of the antitumour activity. The analog 18, 3-benzyl-2-[4-(3-methyl-4,5-dihydronaphtho-[1,2-c]pyrazol-2-yl)-benzenesulfonylimino]-1,3-thiazinan-5-one, proved to be the most active member identified in this series of compounds (GI(50), TGI, and LC(50) MG-MID values of 34...Continue Reading
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