Enantioselective Intermolecular C-H Amination Directed by a Chiral Cation.
Accepted version
Peer-reviewed
Repository URI
Repository DOI
Change log
Authors
Abstract
The enantioselective amination of C(sp3)-H bonds is a powerful synthetic transformation yet highly challenging to achieve in an intermolecular sense. We have developed a family of anionic variants of the best-in-class catalyst for Rh-catalyzed C-H amination, Rh2(esp)2, with which we have associated chiral cations derived from quaternized cinchona alkaloids. These ion-paired catalysts enable high levels of enantioselectivity to be achieved in the benzylic C-H amination of substrates bearing pendant hydroxyl groups. Additionally, the quinoline of the chiral cation appears to engage in axial ligation to the rhodium complex, providing improved yields of product versus Rh2(esp)2 and highlighting the dual role that the cation is playing. These results underline the potential of using chiral cations to control enantioselectivity in challenging transition-metal-catalyzed transformations.
Description
Keywords
Journal Title
Conference Name
Journal ISSN
1520-5126
Volume Title
Publisher
Publisher DOI
Rights
Sponsorship
European Research Council (757381)
Royal Society (URF\R\191003)