A-Ring Dihalogenation Increases the Cellular Activity of Combretastatin-Templated Tetrazoles
作者:Thomas M. Beale、Daniel M. Allwood、Andreas Bender、Peter J. Bond、James D. Brenton、D. Stephen Charnock-Jones、Steven V. Ley、Rebecca M. Myers、James W. Shearman、Jill Temple、Jessica Unger、Ciorsdaidh A. Watts、Jian Xian
DOI:10.1021/ml200149g
日期:2012.3.8
The combretastatins have been investigated for their antimitotic and antivascular properties, and it is widely postulated that a 3,4,5-trimethoxyaryl A-ring is essential to maintain potent activity. We have synthesized new tetrazole analogues (32-34), demonstrating that 3,5-dihalogenation can consistently increase potency by up to 5-fold when compared to the equivalent trimethoxy compound on human umbilical vein endothelial cells (HUVECs) and a range of cancer cells. Moreover, this increased potency offsets that lost by installing the tetrazole bridge into combretastatin A-4 (1), giving crystalline, soluble compounds that have low nanomolar activity, arrest cells in G(2)/M phase, and retain microtubule inhibitory activity. Molecular modeling has shown that optimized packing within the binding site resulting in increased Coulombic interaction may be responsible for this improved activity.