Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 135, Issue 20, Pages 7593-7602Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja4008694
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Funding
- Department of Energy [DE-SC0005430]
- National Science Foundation (NSF) CCI Center for Selective CH Functionalization [CHE-1205646]
- Burt and Deedee McMurtry Stanford Graduate Fellowship
- Stanford University
- Marcus and Amalia Wallenberg Foundation
- Stanford Graduate Fellowship
- Robert M. Bass and Anne T. Bass Stanford Graduate Fellowship
- NSF Graduate Research Fellowship
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1205646] Funding Source: National Science Foundation
- U.S. Department of Energy (DOE) [DE-SC0005430] Funding Source: U.S. Department of Energy (DOE)
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The regio- and chemoselective oxidation of unprotected vicinal polyols with [(neocuproine)Pd- (OAc)](2) (OTf)(2) (1) (neocuproine = 2,9-dimethy1-1,10-phenanthroline) occurs readily under mild reaction conditions to generate alpha-hydroxy ketones. The oxidation of vicinal diols is both faster and more selective than the oxidation of primary and secondary alcohols; vicinal 1,2-diols are oxidized selectively to hydroxy ketones, whereas primary alcohols are oxidized in preference to secondary alcohols. Oxidative lactonization of 1,5-diols yields cyclic lactones. Catalyst loadings as low as 0.12 mol % in oxidation reactions on a 10 g scale can be used. The exquisite selectivity of this catalyst system is evident in the chemoselective and stereospecific oxidation of the polyol (S,S)-1,2,3,4-tetrahydroxybutane [(S,S)-threitol] to (S)-erythrulose. Mechanistic, kinetic, and theoretical studies revealed that the rate laws for the oxidation of primary and secondary alcohols differ from those of diols. Density functional theory calculations support the conclusion that beta-hydride elimination to give hydroxy ketones is product-determining for the oxidation of vicinal diols, whereas for primary and secondary alcohols, pre-equilibria favoring primary alkcaides are product-determining. In situ desorption electrospray ionization mass spectrometry (DESI-MS) revealed several key intermediates in the proposed catalytic cycle.
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