The goal of this program is to define new strategies and methods for the synthesis of bioactive natural products that contain a seven-membered ring. The molecules we make will provide tools to study many biological processes and may ultimately be used to develop new therapeutics, especially for cancer. Specifically, we intend to develop a general strategy for the synthesis of the rearranged steroidal compounds cortistatin A and alkaloids in the Lycopodium family. The cortistatins are potent angiogenesis inhibitors and should find use in combating tumor cell metastasis. We present a strategy to synthesize these natural products using cycloheptadiene precursors. These cycloheptadienes are in turn generated from novel metal-mediated methods. It is our expectation that these new methodological developments for seven-membered ring formation will streamline the synthesis of complex molecules. The total synthesis of the cortistatins and Lycopodium alkaloids will drive new developments, which will in turn, be applied to the synthesis of other molecules of biological and structural interest. These contributions will aid advances in human medicine and chemical biology using small molecules.

Public Health Relevance

Finding new and more efficient ways to construct small organic molecules is an important pursuit that will provide new tools for chemical biology as well as medicine and lead to improvements in human health. Our goals are to develop new strategies and methods that efficiently build small molecules including natural products that are of pharmaceutical importance. In this regard, we are especially interested in new seven- membered ring forming reactions using transition metals.

National Institute of Health (NIH)
National Institute of General Medical Sciences (NIGMS)
Research Project (R01)
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Synthetic and Biological Chemistry A Study Section (SBCA)
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Lees, Robert G
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University of California Berkeley
Schools of Arts and Sciences
United States
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García-Reynaga, Pablo; Zhao, Chunqing; Sarpong, Richmond et al. (2013) New GABA/glutamate receptor target for [³H]isoxazoline insecticide. Chem Res Toxicol 26:514-6
Jeffrey, Jenna L; Bartlett, Emily S; Sarpong, Richmond (2013) Intramolecular C(sp3)-N coupling by oxidation of benzylic C,N-dianions. Angew Chem Int Ed Engl 52:2194-7
Mundal, Devon A; Sarpong, Richmond (2013) Synthetic studies toward the citrinadin A and B core architecture. Org Lett 15:4952-5
de Jesus Cortez, Felipe; Lapointe, David; Hamlin, Amy M et al. (2013) Synthetic studies on the icetexones: enantioselective formal syntheses of icetexone and epi-icetexone. Tetrahedron 69:
Gruver, Jocelyn M; West, Scott P; Collum, David B et al. (2010) Experimental characterization and computational study of unique C,N-chelated lithium dianions. J Am Chem Soc 132:13212-3
Bisai, Vishnumaya; Sarpong, Richmond (2010) Methoxypyridines in the synthesis of Lycopodium alkaloids: total synthesis of (+/-)-lycoposerramine R. Org Lett 12:2551-3
Fischer, Daniel F; Sarpong, Richmond (2010) Total synthesis of (+)-complanadine A using an iridium-catalyzed pyridine C-H functionalization. J Am Chem Soc 132:5926-7
Cortez, Felipe de Jesus; Sarpong, Richmond (2010) Ga(III)-catalyzed cycloisomerization approach to (+/-)-icetexone and (+/-)-epi-icetexone. Org Lett 12:1428-31
Jeffrey, Jenna L; Sarpong, Richmond (2009) Concise synthesis of pauciflorol F using a Larock annulation. Org Lett 11:5450-3