Chiral Phosphoric Acid-Catalyzed Kinetic Resolution via Amide Bond Formation
作者:Yasushi Shimoda、Hisashi Yamamoto
DOI:10.1021/jacs.7b03592
日期:2017.5.24
We describe the kineticresolution of a readily available 2-pyridyl ester via an amide bond formation catalyzed by a chiral Brønsted acid. A chiral phosphoric acid bearing a 2,4,6-trimethyl-3,5-dinitrophenyl group at the 3,3'-position enabled this transformation with high selectivities. We also found that the addition of Lewis acid increased both the reactivity and selectivity in the substrate with
The highly enantioselective synthesis of chiral amides was achieved by an asymmetric Wolff rearrangement. A bifunctional phosphoric acid catalyst not only expedited the transformation but also controlled the enantioselectivity. The developed method enables the asymmetric addition between potent nucleophilic reagents and ketene species and provides a new approach to chiral amides.