This proposal represents a continuation of work initiated under NIH AREA grant CA 67236-04. Natural products of marine origin continue to be a rich source of biologically interesting compounds and pyrrole containing marine natural products in particular have demonstrated activity as anti-tumor agents, multidrug resistant reversal agents, vascular disrupting agents and inhibitors of HIV integrase. These pyrrole containing natural products are usually characterized by highly oxygenated phenyl or heterocyclic groups attached at carbons 3 and 4 of the pyrrole ring system along with carbonyl containing functionality located at carbons 2 and/or 5. The synthetic methodology that we have established and are developing allows for rapid construction of highly substituted and highly functionalized pyrroles. This methodology also allows for great structural diversity for structure activity relationship (SAR) studies, which could lead to chemotherapeutic agents with increased potency and decreased toxic side effects. Work proposed for the new funding cycle will involve applying our synthetic methodology along with some new and complimentary methodology to the synthesis of the marine natural products lycogallic acid, lycogarubin B, lycogarubin C, lynamycin E and related compounds, such as new analogs of JG-03-14. JG-03-14 is an interesting synthetic pyrrole, which has emerged from our research efforts, and has demonstrated in vitro activity (IC50 of 35 nM) against breast cancer cell lines and in vivo activit against a mouse prostate cancer xenograft. JG-03-14 has also been shown to be active against drug resistant breast cancer cell lines, an inhibitor of tubulin polymerization, a vascular disrupting agent and a promoter of autophagic cell death. Our current and evolving synthetic methodologies will allow us to extend our targets to these important bioactive, natural products and new JG-03-14 analogs. All of the target molecules, their precursors and their analogs will be subject to biological evaluation by a team of highly experienced collaborators and such studies will be coupled with molecular modeling by an additional collaborator. Since our project encompasses synthesis, bioassay and molecular modeling driven SAR, we believe that a novel and viable clinical candidate for cancer chemotherapy may well emerge from such studies.

Public Health Relevance

The development of new and novel chemotherapeutic agents for a particular disease state continues to depend to a significant degree on the discovery of a "lead compound", which can be further developed into a viable drug candidate. Naturally occurring compounds continue to be a major source of "drug leads" and our current proposal seeks to utilize our pyrrole forming reactions to synthesize biologically interesting natural products such as lycogallic acid, lycogarubins B and C, lynamycin E and related compounds. In addition to these natural product targets, we will continue to develop new derivatives of our synthetic pyrrole, JG-03-14, which continues to exhibit promising biological properties. The majority of these natural products, their analogs and precursors along with JG-03-14 analogs will be biologically evaluated and computationally modeled by a team of highly experienced collaborators.

National Institute of Health (NIH)
National Cancer Institute (NCI)
Academic Research Enhancement Awards (AREA) (R15)
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Synthetic and Biological Chemistry B Study Section (SBCB)
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Fu, Yali
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University of Richmond
Schools of Arts and Sciences
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Gupton, John T; Telang, Nakul; Wormald, Michael et al. (2014) Formyl Group Activation of a Bromopyrrole Ester in Suzuki Cross-Coupling Reactions: Application to a Formal Synthesis of Polycitone A and B and Polycitrin A. Tetrahedron 70:2738-2745
Biggers, Jonathan W; Nguyen, Tuyen; Di, Xu et al. (2013) Autophagy, cell death and sustained senescence arrest in B16/F10 melanoma cells and HCT-116 colon carcinoma cells in response to the novel microtubule poison, JG-03-14. Cancer Chemother Pharmacol 71:441-55
Gupton, John T; Telang, Nakul; Gazzo, Dominic F et al. (2013) Preparation of Indole Containing Building Blocks for the Regiospecific Construction of Indole Appended Pyrazoles and Pyrroles. Tetrahedron 69:5829-5840
Da, Chenxiao; Mooberry, Susan L; Gupton, John T et al. (2013) How to deal with low-resolution target structures: using SAR, ensemble docking, hydropathic analysis, and 3D-QSAR to definitively map the **-tubulin colchicine site. J Med Chem 56:7382-95
Gupton, John T; Telang, Nakul; Jia, Xin et al. (2010) Further studies on vinamidinium salt amine exchange reactions, borohydride reductions and subsequent transformations. Tetrahedron 66:8485-8493
Gupton, John T; Telang, Nakul; Banner, Edith J et al. (2010) The application of (Z)-3-aryl-3-haloenoic acids to the synthesis of (Z)-5-benzylidene-4-arylpyrrol-2(5H)-ones. Tetrahedron 66:9113-9122
Gupton, John T; Giglio, Benjamin C; Eaton, James E et al. (2009) The application of vinylogous iminium salt derivatives to efficient formal syntheses of the marine akaloids lamellarin G trimethyl ether and ningalin B. Tetrahedron 65:4283-4292
Tripathi, Ashutosh; Fornabaio, Micaela; Kellogg, Glen E et al. (2008) Docking and hydropathic scoring of polysubstituted pyrrole compounds with antitubulin activity. Bioorg Med Chem 16:2235-42
Gupton, John T; Banner, Edith J; Sartin, Melissa D et al. (2008) The Application of Vinylogous Iminium Salt Derivatives and Microwave Accelerated Vilsmeier-Haack Reactions to Efficient Relay Syntheses of the Polycitone and Storniamide Natural Products. Tetrahedron 64:5246-5253
Mooberry, Susan L; Weiderhold, Kimberly N; Dakshanamurthy, Sivanesan et al. (2007) Identification and characterization of a new tubulin-binding tetrasubstituted brominated pyrrole. Mol Pharmacol 72:132-40

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