Chemoselective Rh-Catalyzed Allylic Alkylations of Chelated Enolates using Dienylcarbonates
作者:Saskia Hähn、Uli Kazmaier
DOI:10.1002/ejoc.201100350
日期:2011.7.14
catalyst not only for highly regio- but also chemoselectiveallylicalkylations of chelated enolates. In contrast to Pd-catalyzed reactions, the Rh-catalyzed version shows also a high degree of regioretention and proceeds without isomerization. Allylic substrates with competitive allylic subunits react selectively at the sterically least hindered allylic position, in comparison to Ru-catalyzed processes
Iridium-Catalyzed Enantioselective Allylic Alkylation with Functionalized Organozinc Bromides
作者:James Y. Hamilton、David Sarlah、Erick M. Carreira
DOI:10.1002/anie.201501851
日期:2015.6.22
Iridium‐catalyzed enantioselectiveallylicalkylation of branched racemic carbonates with functionalized alkylzinc bromide reagents is described. Enabled by a chiral Ir/(P,olefin) complex, the method described allows allylic substitution with various primary and secondary alkyl nucleophiles with excellent regio‐ and enantioselectivities. The developed reaction was showcased in a concise, asymmetric