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Synthesis of a 2-Aryl-3-aroyl Indole Salt (OXi8007) Resembling Combretastatin A-4 with Application as a Vascular Disrupting Agent

2013; American Chemical Society; Volume: 76; Issue: 9 Linguagem: Inglês

10.1021/np400374w

1520-6025

Mallinath B. Hadimani, Matthew T. MacDonough, Anjan Ghatak, Tracy E. Strecker, Ramona Lopez, Madhavi Sriram, Benson L. Nguyen, John J. Hall, Raymond J. Kessler, Anupama Shirali, Li Liu, C. Michael Garner, George R. Pettit, Ernest Hamel, David J. Chaplin, Ralph P. Mason, Mary Lynn Trawick, Kevin G. Pinney,

Synthesis and Reactions of Organic Compounds

The natural products colchicine and combretastatin A-4 are potent inhibitors of tubulin assembly, and they have inspired the design and synthesis of a large number of small-molecule, potential anticancer agents. The indole-based molecular scaffold is prominent among these SAR modifications, leading to a rapidly increasing number of agents. The water-soluble phosphate prodrug 33 (OXi8007) of 2-aryl-3-aroylindole-based phenol 8 (OXi8006) was prepared by chemical synthesis and found to be strongly cytotoxic against selected human cancer cell lines (GI₅₀ = 36 nM against DU-145 cells, for example). The free phenol, 8 (OXi8006), was a strong inhibitor (IC₅₀ = 1.1 μM) of tubulin assembly. The corresponding phosphate prodrug 33 (OXi8007) also demonstrated pronounced interference with tumor vasculature in a preliminary in vivo study utilizing a SCID mouse model bearing an orthotopic PC-3 (prostate) tumor as imaged by color Doppler ultrasound. The combination of these results provides evidence that the indole-based phosphate prodrug 33 (OXi8007) functions as a vascular disrupting agent that may prove useful for the treatment of cancer.