Palladium (II/IV) catalyzed cyclopropanation reactions: scope and mechanism
作者:Thomas W. Lyons、Melanie S. Sanford
DOI:10.1016/j.tet.2008.10.107
日期:2009.4
This report describes detailed studies of the scope and mechanism of a new Pd-catalyzed oxidation reaction for the stereospecific conversion of enynes into cyclopropyl ketones. Unlike related PdII/0, Au, and Pt-catalyzed cyclopropane-forming reactions, these transformations proceed with net inversion of geometry with respect to the starting alkene. This result, along with other mechanistic data, is
A gold‐catalyzed asymmetriccyclopropanation of unactivated olefins with sulfoniumylides in the presence of a bimetallic catalyst with a novel dimeric TADDOL‐phosphoramidite ligand is reported. This transformation allows a rare gold‐catalyzed dynamic deracemization of chiral racemic substrates, where the same catalyst is responsible for several synergistic tasks in solution. The products are useful