Bifunctionalorganocatalysts bearing amino and urea functional groups in a chiral molecular skeleton were applied to the enantioselective synthesis of axially chiral benzamides via aromatic electrophilic bromination. The results demonstrate the versatility of bifunctionalorganocatalysts for the enantioselective construction of axially chiral compounds. Moderate to good enantioselectivities were afforded
Enantioselective Synthesis of Atropisomeric Benzamides through Peptide-Catalyzed Bromination
作者:Kimberly T. Barrett、Scott J. Miller
DOI:10.1021/ja400082x
日期:2013.2.27
low conversion suggested that the initial catalytic bromination may be regioselective and stereochemistry-determining. A complex between the catalyst and substrate was observed by NMR spectroscopy, revealing a specific association. Finally, the products of these reactions may be subjected to regioselective metal-halogen exchange and trapping with I(2), setting the stage for utility.