An iridium-catalyzed remote site-switchable hydroarylation of alkenes controlled by two different ligands was reported. The protocol enables access to the products functionalized at the subterminal methylene and terminal methyl positions on an alkyl chain in good results. The results of the control experiments and DFT calculations demonstrate that the reaction involves a chain-walking process and the
Regioselective alkylation of 2-phenylpyridines with terminal alkenes via C–H bond activation by a rhodium catalyst
作者:Yeong-Gweon Lim、Jung-Bu Kang、Yong Hae Kim
DOI:10.1039/p19960002201
日期:——
2-Phenylpyridine 1a reacts with various terminal alkenes in the presence of a rhodium(I) complex catalyst to give the corresponding mono ortho-alkylated products 2a-i and doubly alkylated products 3a-b (9:1), The same reaction using 3-methyl-2-phenylpyridine 1b gives the mono alkylated products 2j-n exclusively under the same reaction conditions due to steric hindrance between the methyl group of the pyridine and the alkyl group of 2j-n.
Carboxylate-Assisted Ruthenium(II)-Catalyzed Hydroarylations of Unactivated Alkenes through C-H Cleavage
作者:Marvin Schinkel、Ilan Marek、Lutz Ackermann
DOI:10.1002/anie.201208446
日期:2013.4.2
Catalytic: Ruthenium(II)biscarboxylate complexes enabled highly effective hydroarylations of unactivatedalkenesthrough CH bond activation. This method has a broad substrate scope and allowed for versatile functionalizations of highly fluorinated alkenes.