Cobalt-Catalyzed Direct C(sp<sup>2</sup>
)-H Alkylation with Unactivated Alkenes
作者:Ye Lim Kim、Sun-a Park、Ju Hyun Kim
DOI:10.1002/ejoc.202000565
日期:2020.7.15
An efficient Cp*CoIII‐catalyzed direct C(sp2)–H bond alkylation with unactivated alkenes was developed, affording mono‐diarylethane products with high linear selectivity. This reaction provided a simple, practical, and atom‐economical way to construct phenethyl groups on sp2 carbon. A wide range of arenes, styrenes, and alkyl arenes were well tolerated under mild reaction conditions and showed high
开发了一种有效的Cp * Co III催化的具有未活化烯烃的直接C(sp 2)-H键烷基化反应,从而提供具有高线性选择性的单二芳基乙烷产品。该反应为在sp 2碳上构建苯乙基提供了一种简单,实用且原子经济的方法。各种芳烃,苯乙烯和烷基芳烃在温和的反应条件下均具有良好的耐受性,并具有很高的官能团相容性。
<i>meta</i>
‐Selective C−H Activation of Arenes at Room Temperature Using Visible Light: Dual‐Function Ruthenium Catalysis
作者:Arunachalam Sagadevan、Michael F. Greaney
DOI:10.1002/anie.201904288
日期:2019.7.15
Ruthenium‐catalyzedmeta‐C−H activation of arenes at roomtemperature is reported to proceed under blue‐light irradiation. A variety of heteroarenes are compatible with this photochemical process, which leads to the corresponding meta C−C coupling products in good to very good yields. Initial mechanistic studies suggest a single‐electron transfer process occurs between a photoexcited RuII‐cyclometalated
Palladium-catalyzed CH alkylation reaction of 2-phenylpyridines with alkyliodides has been successfully developed. The palladacycles obtained from 2-phenylpyridines should act as the key intermediate in the alkylation reaction.
Manganese‐Catalyzed C(sp
<sup>2</sup>
)−H Alkylation of Indolines and Arenes with Unactivated Alkyl Bromides
作者:Suryadev K. Verma、Benudhar Punji
DOI:10.1002/asia.202200103
日期:2022.5.2
A ligand-free and cost-effective Mn(II)-catalyzed chemo- and regioselective method for the C(sp2)−H bond alkylation of indolines and (2-pyridinyl)arenes with diverse alkyl bromides is disclosed.
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