Univ Estadual Campinas, Inst Chem, BR-10384612 Sao Paulo - Brazil
Total Affiliations: 2
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION;
NOV 16 2015.
Web of Science Citations:
We describe herein a highly regio- and enantioselective Pd-catalyzed Heck arylation of unactivated trisubstituted acyclic olefins to provide all-carbon quaternary stereogenic centers. Chiral N,N ligands of the pyrimidine-and pyrazino-oxazoline class were developed for that purpose, providing the desired products in good to high yields with enantiomeric ratios up to > 99:1. Both linear and branched substituents on the olefins were well-tolerated. The potential of this new method is demonstrated by the straightforward synthesis of several O-methyl lactols and lactones containing quaternary stereocenters, together with a concise enantioselective total synthesis of the calcium channel blocker verapamil. (AU)