Enantioselective Cyano-Alkoxycarbonylation of α-Oxoesters Promoted by Brønsted Acid–Lewis Base Cooperative Catalysts
摘要:
The highly enantioselective cyano-alkoxycarbonylation of alpha-oxoesters with alkyl cyanoformates is promoted by a new chiral Bronsted acid-Lewis base cooperative organocatalyst. The present catalysis can be performed at room temperature under nitrogen or air.
Enantioselective Cyano-Alkoxycarbonylation of α-Oxoesters Promoted by Brønsted Acid–Lewis Base Cooperative Catalysts
作者:Kazuaki Ishihara、Yoshihiro Ogura
DOI:10.1021/acs.orglett.5b03093
日期:2015.12.18
The highly enantioselective cyano-alkoxycarbonylation of alpha-oxoesters with alkyl cyanoformates is promoted by a new chiral Bronsted acid-Lewis base cooperative organocatalyst. The present catalysis can be performed at room temperature under nitrogen or air.
Asymmetric Vinylogous Aldol Reaction via H-Bond-Directing Dienamine Catalysis
The enantioselective direct vinylogous aldolreaction of 3-methyl 2-cyclohexen-1-one with α-ketoesters has been developed. The key to success was the design of a bifunctionalprimary amine-thiourea catalyst that can combine H-bond-directing activation and dienamine catalysis. The simultaneous dual activation of the two reacting partners results in high reactivity while securing high levels of stereocontrol