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.
Selective Heterogeneous C−H Activation/Halogenation Reactions Catalyzed by Pd@MOF Nanocomposites
作者:Vlad Pascanu、Fabian Carson、Marta Vico Solano、Jie Su、Xiaodong Zou、Magnus J. Johansson、Belén Martín-Matute
DOI:10.1002/chem.201502918
日期:2016.3.7
directed heterogeneousC−Hactivation/halogenationreactioncatalyzed by readily synthesized Pd@MOF nanocatalysts was developed. The heterogeneous Pd catalysts used were a novel and environmentally benign Fe‐based metal–organic framework (MOF) (Pd@MIL‐88B‐NH2(Fe)) and the previously developed Pd@MIL‐101‐NH2(Cr). Very high conversions and selectivities were achieved under very mild reaction conditions
Cu(II)-Catalyzed Functionalizations of Aryl C−H Bonds Using O<sub>2</sub> as an Oxidant
作者:Xiao Chen、Xue-Shi Hao、Charles E. Goodhue、Jin-Quan Yu
DOI:10.1021/ja061715q
日期:2006.5.1
Cu(II)-catalyzed acetoxylation and halogenation of aryl C-H bonds are developed. ortho-Selectivity was observed with a wide range of 2-arylpyridine substrates. Both mono- and difunctionalizations are achieved by tuning the reaction conditions. Excellent functional group tolerance and use of O2 as a stoichiometric oxidant are significant advantages over our recently developed Pd-catalyzed C-H functionalization reactions. These newly discovered reaction conditions are also applicable for cyanation, amination, etherification, and thioetherification of aryl C-H bonds. Mechanistic investigations are carried out to gain insights into the Cu(II)-catalyzed C-H functionalization reactions.