Bispalladacycle-Catalyzed Brønsted Acid/Base-Promoted Asymmetric Tandem Azlactone Formation−Michael Addition
作者:Manuel Weber、Sascha Jautze、Wolfgang Frey、René Peters
DOI:10.1021/ja106088v
日期:2010.9.8
Cooperative activation by a soft bimetallic catalyst, a hard Bronsted acid, and a hard Bronsted base has allowed the formation of highly enantioenriched, diastereomerically pure masked a-amino acids with adjacent quaternary and tertiary stereocenters in a single reaction starting from racemic N-benzoylated amino acids. The products can, for example, be used to prepare bicyclic dipeptides.