A New Biarylphosphine Ligand for the Pd-Catalyzed Synthesis of Diaryl Ethers under Mild Conditions
作者:Luca Salvi、Nicole R. Davis、Siraj Z. Ali、Stephen L. Buchwald
DOI:10.1021/ol202955h
日期:2012.1.6
A new bulky biarylphosphine ligand (L8) has been developed that allows the Pd-catalyzed C–O cross-coupling of a wide range of aryl halides and phenols undermilderconditions than previously possible. A direct correlation between the size of the ligand substituents in the 2′, 4′, and 6′ positions of the nonphosphine containing ring and the reactivity of the derived catalyst system was observed. Specifically
An Alternative Synthesis of Cycloalkyl‐Substituted CPA Catalysts and Application in Asymmetric Protonation Reactions**
作者:Liam A. McLean、Allan J. B. Watson
DOI:10.1002/ejoc.202100980
日期:2021.9.21
offers an alternative approach to tri(cycloalkyl)aryl-substituted CPAs. Combined with an improved Kumada coupling, this approach allows access to emerging highly selective and novel CPAcatalysts. The applicability of the route is demonstrated by preparation of three different tri(cycloalkyl)aryl-substituted CPAs and the utility of these catalysts in exemplified in representative asymmetric protonation