The major goal of this research program is to develop catalytic enantioselective transformations based on the concept of chiral anion phase transfer catalysis that will be broadly applicable to the preparation of therapeutically relevant organic molecules. Towards this end, several new enantioselective reactions of carbon-carbon pi-bonds are proposed, with a major emphasis placed on the development of enantioselective sp3-C-F bond construction. We will develop reactions that involve activation of pi-bonds as electrophiles towards heteroatom and carbon-based nucleophiles, by coordination phosphate-derived chiral anions in the presence of cationic electrophiles. We will also demonstrate that this reactivity manifold is applicable to other reaction classes, such as direct enantioselective fluorination reactions and fluorinated dearomatization. These methods will be exploited in the enantioselective construction of fluorinated building blocks, heterocycles and natural product analogs. Thus, we anticipate that the proposed air and moisture tolerant transformations will provide synthetic chemists and biomedical researchers with additional tools for single enantiomer synthesis.

Public Health Relevance

The proposed program aims to develop new methods for the preparation of structures and compounds of potential importance to medicinal chemistry. To this end, the enantioselective formation of fluorinated carbocyclic and heterocyclic structures using chiral anion phase transfer catalysis is proposed.

National Institute of Health (NIH)
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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Yang, Xiaoyu; Phipps, Robert J; Toste, F Dean (2014) Asymmetric fluorination of ?-branched cyclohexanones enabled by a combination of chiral anion phase-transfer catalysis and enamine catalysis using protected amino acids. J Am Chem Soc 136:5225-8
Nelson, Hosea M; Reisberg, Solomon H; Shunatona, Hunter P et al. (2014) Chiral anion phase transfer of aryldiazonium cations: an enantioselective synthesis of C3-diazenated pyrroloindolines. Angew Chem Int Ed Engl 53:5600-3
Zi, Weiwei; Wang, Yi-Ming; Toste, F Dean (2014) An in situ directing group strategy for chiral anion phase-transfer fluorination of allylic alcohols. J Am Chem Soc 136:12864-7
Neel, Andrew J; Hehn, Jorg P; Tripet, Pascal F et al. (2013) Asymmetric cross-dehydrogenative coupling enabled by the design and application of chiral triazole-containing phosphoric acids. J Am Chem Soc 135:14044-7
Lackner, Aaron D; Samant, Andrew V; Toste, F Dean (2013) Single-operation deracemization of 3H-indolines and tetrahydroquinolines enabled by phase separation. J Am Chem Soc 135:14090-3