Conditions for the palladium-catalyzed directarylation of a wide range of heterocycles with aryl bromides are reported. Those conditions employ a stoichiometric ratio of both coupling partners, as well as a substoichiometric quantity of pivalicacid, which results in significantly faster reactions. An evaluation of the influence of the nature of the aryl halide has also been carried out.
Highly electron-poor Buchwald-type ligand: application for Pd-catalysed direct arylation of thiophene derivatives and theoretical consideration of the secondary Pd<sup>0</sup>–arene interaction
作者:Toshinobu Korenaga、Ryo Sasaki、Kazuaki Shimada
DOI:10.1039/c5dt01991e
日期:——
Highly electron-poor SPhos ligands stabilised the Pd complex by secondary Pd0–arene interaction.
高度电子贫化的SPhos配体通过次要的Pd0-芳烃相互作用稳定了Pd配合物。
Tertiary Arsine Ligands for Pd-Catalyzed Direct Arylation
electron-deficient ligands. However, no studies have explored the relationship between the structure of the arsine ligands and their catalytic activity for direct arylation. In this study, we synthesized 27 arsine ligands with varying electron-donating and steric properties. Tris(o-trifluorotolyl)arsine, an electron-deficient and bulky ligand, exhibited the highest efficiency in a model reaction between