Novel (E)-3-(3-oxo-4-substituted-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-hydroxypropenamides as Histone Deacetylase Inhibitors: Design, Synthesis and Bioevaluation

Herein, we report the design, synthesis and evaluation of novel (E)-3-(3-oxo-4-substituted-3,4-dihydro-2H-benzo[b][1,4]oxazin-6-yl)-N-hydroxypropenamides (4a-i, 7a-g) targeting histone deacetylases. Three human cancer cell lines were used to test the cytotoxicity of the synthesized compounds (SW620, colon; PC-3, prostate; NCI-H23, lung cancer); inhibitory activity towards HDAC; anticancer activity; as well as their impact on the cell cycle and apoptosis. As a result, compounds 4a-i bearing the alkyl substituents seemed to be less potent than the benzyl-containing compounds 7a-g in all biological assays. Compounds 7e-fwere found to be the most active HDAC inhibitors with IC50 of 1.498 ± 0.020 μM and 1.794 ± 0.159 μM, respectively. In terms of cytotoxicity and anticancer assay, 7e and 7f also showed good activity with IC50 values in the micromolar range. In addition, the cell cycle and apoptosis of SW620 were affected by compound 7f in almost a similar manner to that of reference compound SAHA. Docking assays were carried out for analysis the binding mode and selectivity of this compound toward 8 HDAC isoforms. Overall, our data confirmed that the inhibition of HDAC plays a pivotal role in their anticancer activity.

Novel (E)-3-(1- substituted-1H-indazol-5-yl)-N-hydroxypropenamides as Histone Deacetylase Inhibitors: Design, Synthesis and Structure-Activity Relationships

Histone deacetylases are one of the most interesting targets for anticancer drug discovery and developments. Herein, we report the design, synthesis and evaluation of novel N- hydroxypropenamides bearing indazole moiety...