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Organic Chemistry Seminar

Wednesday, October 2, 2013
4:00pm to 5:00pm
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Noyes 153 (J. Holmes Sturdivant Lecture Hall)
Synthetic Discoveries from Polycyclic Natural Products
Jeremy A. May, Assistant Professor, Department of Chemistry, University of Houston,

     The genus Flindersia produces bis-indole alkaloids that have demonstrated antimalarial activity. At least one of these natural products is toxic to Plasmodia falciparum via a novel mechanism of action. Work toward the biomimetic and enantioselective total synthesis of these alkaloids has led to discoveries in these natural products' biosynthesis as well as methods for stereoselective catalysis to generate chiral heterocycles. Specifically, acidic conditions that provide both stereocontrol and control over structural isomer formation have been defined for the biomimetic synthesis of the alkaloids. To facilitate enantioselective synthesis of the compounds, an enantioselective organocatalytic addition of boron-based nucleophiles to β-heterocycle appended enones was developed. This transformation has proven general for the synthesis of alpha-chiral heterocycles.

     Another line of research targets the synthesis of biologically-active bridged polycyclic terpenoid natural products via a carbene-initiated cascade sequence. A terminal C-H bond insertion allows for the controlled formation of a variety of bridged ring geometries. This strategy allows for the rapid synthesis of the target molecules' cores.

For more information, please contact Arleen (Lynne) Martinez by phone at 626-395-4004 or by email at lynnem@caltech.edu.