Catalytic Enantioselective α-Oxysulfonylation of Ketones Mediated by Iodoarenes
作者:Sabine M. Altermann、Robert D. Richardson、T. Keri Page、Ruth K. Schmidt、Edward Holland、Umal Mohammed、Shauna M. Paradine、Andrew N. French、Christine Richter、A. Masih Bahar、Bernhard Witulski、Thomas Wirth
DOI:10.1002/ejoc.200800741
日期:2008.11
alpha-oxysulfonylation of ketones catalysed by enantioenriched iodoarenes using mCPBA as stoichiometric oxidant is reported to give useful synthetic intermediates in good yield and modest enantioselectivity. We believe this to be the first report of an enantioselective organocatalytic reaction involving hypervalent iodine reagents which should open up a new field for enantioselective organocatalysis of oxidation
Enantiomerically pure iodoarene (S)-2 and its derivatives (S)-3 to (S)-18 with a spirobiindane scaffold have been synthesized. The evaluation of these new chiral iodoarenes as catalysts in the enantioselective alpha-tosyloxylation of ketones was performed using m-CPBA as a stoichiometric oxidant, and the synthetically useful alpha-tosyloxylated ketones were obtained in up to 58% enantiomeric excess (ee). (C) 2011 Elsevier Ltd. All rights reserved.
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