Synthesis of hybrid anticancer agents based on kinase and histone deacetylase inhibitorsElectronic supplementary information (ESI) available: Synthesis of hybrids, cell-based assay details. See DOI: 10.1039/c4md00211c

Fragments based on the VEGFR2i Semaxanib (SU5416, (vascular endothelial growth factor receptor-2 inhibitor) and the HDACi (histone deacetylase inhibitor) SAHA (suberanilohydroxamic acid) have been merged to form a range of low molecular weight dual action hybrids. Vindication of this approach is provided by SAR, docking studies, in vitro cancer cell line and biochemical enzyme inhibition data as well as in vivo Xenopus data for the lead molecule ( Z )-N1-(3-((1 H -pyrrol-2-yl)methylene)-2-oxoindolin-5-yl)-N8-hydroxyoctanediamide 6 . A HDAC, kinase inhibitor hybrid, ( Z )-N1-(3-((1 H -pyrrol-2-yl)methylene)-2-oxoindolin-5-yl)-N8-hydroxyoctanediamide, 6 , showed impressive anticancer action in a number of biochemical and cell-based assays.