Role of Configuration at C6 in Catalytic Activity of <scp>l</scp>-Proline-Derived Bifunctional Organocatalysts
作者:Hui Jin、Soo Min Cho、Juyeol Lee、Do Hyun Ryu
DOI:10.1021/acs.orglett.7b01000
日期:2017.5.5
chiral bifunctional (thio)urea organocatalysts epi-PTU and epi-PU were newly synthesized, and their catalytic performances were compared with their C6 epimeric catalysts PTU and PU in various Michael reactions of nitrostyrene in terms of reactivities and stereoselectivities. The experimental results indicate that a proper relative stereochemistry at C2 and C6 in l-proline-derived bifunctional organocatalysts
Asymmetric hydrogenation of esters through homogeneous catalysis is a significantly important transformation in organic synthesis. The systems developed so far mainly focused on chiral iridium and ruthenium catalysts, which required a base to facilitate the activity. Herein, we present a palladium-catalyzed asymmetric hydrogenation of lactones under base-free conditions through dynamic kinetic resolution