Regioselective Derivatizations of a Tribrominated Atropisomeric Benzamide Scaffold
作者:Kimberly T. Barrett、Scott J. Miller
DOI:10.1021/ol503593y
日期:2015.2.6
The enantioselective synthesis of atropisomeric, tribrominated benzamides and subsequent regioselective transformations to afford derivatized, axially chiral molecules is reported. The enantioenriched tribromides were carried through sequential Pd-catalyzedcross-coupling and lithium–halogen exchange with high regioselectivity and enantioretention. A variety of complexity-generation functional group
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.
Bifunctional Organocatalysts for the Enantioselective Synthesis of Axially Chiral Isoquinoline <i>N</i>-Oxides
作者:Ryota Miyaji、Keisuke Asano、Seijiro Matsubara
DOI:10.1021/jacs.5b04151
日期:2015.6.3
Bifunctional catalysts bearing amino and urea functional groups have been applied for a novel, highly enantioselective synthesis of axially chiral isoquinoline N-oxides, which are promising chiral ligands or organocatalysts in organic synthesis. This is the first example of highly enantioselective synthesis of axially chiral biaryls by bifunctional organocatalysts. Good-to-excellent enantioselectivities were obtained with a range of substrates.
Bifunctional organocatalysts for the asymmetric synthesis of axially chiral benzamides
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