Scope and selectivity in palladium-catalyzed directed C–H bond halogenation reactions
作者:Dipannita Kalyani、Allison R. Dick、Waseem Q. Anani、Melanie S. Sanford
DOI:10.1016/j.tet.2006.06.075
日期:2006.12
Palladium-catalyzed ligand directed C–H activation/halogenation reactions have been extensively explored. Both the nature of the directing group and the substitution pattern on the arene ring of the substrate lead to different reactivity profiles, and often different and complementary products, in the presence and absence of the catalyst.
Oxygen‐Linked Cyclopentadienyl Rhodium(III) Complexes‐Catalyzed Asymmetric C−H Arylation of Benzo[
<i>h</i>
]quinolines with 1‐Diazonaphthoquinones
作者:Chongqing Pan、Si‐Yong Yin、Shao‐Bo Wang、Qing Gu、Shu‐Li You
DOI:10.1002/anie.202103638
日期:2021.7.5
functionalization reactions have witnessed a significant progress in organic synthesis. In sharp contrast, the reported chiral Cp ligands are limited to C-linked Cp and are often synthetically challenging. To address these issues, we have developed a novel class of tunable chiral cyclopentadienyl ligands bearing oxygen linkers, which were efficient catalysts for C−H arylation of benzo[h]quinolines with
Directed C−H Activation and Tandem Cross-Coupling Reactions Using Palladium Nanocatalysts with Controlled Oxidation
作者:Kiseong Kim、Younjae Jung、Suyeon Lee、Mijong Kim、Dongwoo Shin、Hyeeun Byun、Sung June Cho、Hyunjoon Song、Hyunwoo Kim
DOI:10.1002/anie.201700301
日期:2017.6.6
palladium nanoparticles provided high‐valent PdIV oxo‐clusters which efficiently promote directedC−H halogenation reactions. In addition, palladium nanoparticles can undergo changes in oxidation states to provide both high‐valent PdIV and low‐valent Pd0 species within one system, and thus a tandem reaction of C−H halogenation and cross‐coupling (C−N, C−C, and C−S bond formation) was successfully established
copper-catalyzed C-H halogenation of 2-aryl-pyridinescontaining a variety of electron-withdrawing and electron-donatingsubstituents was described. It is worth noting that cheap and easy-to-handlelithium halides were utilized as the halogen sources.