<i>t</i>BuLi-Mediated One-Pot Direct Highly Selective Cross-Coupling of Two Distinct Aryl Bromides
作者:Carlos Vila、Sara Cembellín、Valentín Hornillos、Massimo Giannerini、Martín Fañanás-Mastral、Ben L. Feringa
DOI:10.1002/chem.201502709
日期:2015.10.26
A Pd‐catalyzed direct cross‐coupling of twodistinctarylbromides mediated by tBuLi is described. The use of [Pd‐PEPPSI‐IPr] or [Pd‐PEPPSI‐IPent] as catalyst allows for the efficient one‐pot synthesis of unsymmetrical biaryls at room temperature. The key for this selective cross‐coupling is the use of an ortho‐substituted bromide that undergoes lithium–halogen exchange preferentially.
Extending the Substrate Scope in the Hydrogenation of Unfunctionalized Tetrasubstituted Olefins with Ir-P Stereogenic Aminophosphine–Oxazoline Catalysts
作者:Maria Biosca、Ernest Salomó、Pol de la Cruz-Sánchez、Antoni Riera、Xavier Verdaguer、Oscar Pàmies、Montserrat Diéguez
DOI:10.1021/acs.orglett.8b04084
日期:2019.2.1
MaxPHOX-type ligands have been successfully applied in the challenging asymmetrichydrogenation of tetrasubstitutedolefins under mild reaction conditions. Gratifyingly, these catalyst precursors are able to efficiently hydrogenate not only a range of indene derivatives (ee’s up to 96%) but also 1,2-dihydronapthalene derivatives and acyclic olefins (ee’s up to 99%), which both constitute the most challenging