The development of broadly useful and conceptually novel strategies for catalysis using high oxidation state transition metal complexes is proposed. In general, these reactions employ metal-oxo complexes, of rhenium and vanadium, as catalysts for a variety of organic transformations including reductions, substitution, additions and oxidations. Rhenium(V)-dioxo complexes can be employed as catalysts for chemoselective and enantioselective hydrosilylation of aldehydes, ketones and imines. This represents a reversal in the traditional role of this catalysts as oxidizing agents. The continued development of chiral versions of these rhenium(V)-oxo complexes for the enantioselective synthesis of alcohols and imines will be is proposed. More specifically, the unique ability of these complexes to enantio- and regioselectively reduce unsaturated imines will be exploited. Additionally, rhenium-oxo catalyzed addition of carbon (cyanide, allyl, trifluoromethyl) and metalloid (borane, stannane) nucleophiles is proposed. Metal-oxo catalyzed oxidations are also proposed. For example, studies on vanadium-catalyzed oxidative kinetic resolution and rhenium catalyzed enantioselective sulfoxidations are described. Additionally, novel rhenium-oxo catalyzed oxidative transformation (e.g. cleavage of olefins to imines) will be developed. Development of a number of new transformations that take advantage of the unique properties of metal-oxo complexes are proposed. Theses include unprecedented metal-oxo catalyzed de-racemization reactions, tandem oxidative cleavage/enantioselective additions and tandem rearrangements/enantioselective additions. ? ? ?

Agency
National Institute of Health (NIH)
Institute
National Institute of General Medical Sciences (NIGMS)
Type
Research Project (R01)
Project #
1R01GM074774-01A2
Application #
7262397
Study Section
Synthetic and Biological Chemistry A Study Section (SBCA)
Program Officer
Schwab, John M
Project Start
2007-03-12
Project End
2011-02-28
Budget Start
2007-03-12
Budget End
2008-02-29
Support Year
1
Fiscal Year
2007
Total Cost
$269,905
Indirect Cost
Name
University of California Berkeley
Department
Chemistry
Type
Schools of Arts and Sciences
DUNS #
124726725
City
Berkeley
State
CA
Country
United States
Zip Code
94704
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