The Pyridyldiisopropylsilyl Group: A Masked Functionality and Directing Group for Monoselective ortho-Acyloxylation and ortho-Halogenation Reactions of Arenes
作者:Chunhui Huang、Natalia Chernyak、Alexander S. Dudnik、Vladimir Gevorgyan
DOI:10.1002/adsc.201000975
日期:2011.5
removable and modifiable silicon‐tethered pyridyldiisopropylsilyl directing group for CH functionalizations of arenes has been developed. The installation of the pyridyldiisopropylsilyl group can efficiently be achieved via two complementary routes using easily available 2‐(diisopropylsilyl)pyridine (5). The first strategy features a nucleophilic hydride substitution at the silicon atom in 5 with aryllithium
开发了一种新型、易于去除和可修饰的硅系吡啶基二异丙基甲硅烷基导向基团,用于芳烃的 C - H 官能化。使用容易获得的 2-(二异丙基甲硅烷基)吡啶 ( 5 ),可以通过两条互补路线有效地实现吡啶基二异丙基甲硅烷基的安装。第一种策略的特点是用由相应的芳基溴化物或碘化物原位产生的芳基锂试剂在5中的硅原子上进行亲核氢化物取代。第二条较温和的路线利用了5碘化物和芳基碘化物之间高效的室温铑 (I) 催化交叉偶联反应。后一种方法可用于制备各种具有多种官能团的吡啶基二异丙基甲硅烷基取代的芳烃,包括与有机金属试剂不相容的官能团。吡啶基二异丙基甲硅烷基导向基团可以实现高效、区域选择性的钯(II)催化的单邻酰氧基化和各种芳香族化合物的邻卤化。最重要的是,酰氧基化和卤化产物中的硅系导向基团可以轻松去除或有效转化为一系列其他有价值的官能团。这些转化包括质子、氘代、卤代、硼代和炔基脱甲硅烷基化,以及导向基团向羟基官
CO<sub>2</sub>
Conversion into Esters by Fluoride-Mediated Carboxylation of Organosilanes and Halide Derivatives
作者:Xavier Frogneux、Niklas von Wolff、Pierre Thuéry、Guillaume Lefèvre、Thibault Cantat
DOI:10.1002/chem.201505092
日期:2016.2.24
A one‐step conversion of CO2 into heteroaromatic esters is presented under metal‐free conditions. Using fluoride anions as promoters for the C−Si bond activation, pyridyl, furanyl, and thienyl organosilanes are successfully carboxylated with CO2 in the presence of an electrophile. The mechanism of this unprecedented reaction has been elucidated based on experimental and computational results, which
A nickel-catalyzed silylation reaction of alkyl aryl sulfoxides with silylzinc reagents
作者:Wei-Ze Li、Zhong-Xia Wang
DOI:10.1039/d1ob00840d
日期:——
Ni(PEt3)Cl2-catalyzed silylation of alkyl arylsulfoxides with silylzinc reagents was carried out. This protocol allows alkyl arylsulfoxides to convert to arylsilicon compounds under mild reaction conditions, tolerates a range of functional groups and is suitable for a wide scope of substrates.
Nickel‐Catalyzed Reaction of Aryl 2‐Pyridyl Ethers with Silylzinc Chlorides: Silylation of Aryl 2‐Pyridyl Ethers via Cleavage of the Carbon−Oxygen Bond
作者:Ying‐Ying Kong、Zhong‐Xia Wang
DOI:10.1002/adsc.201900949
日期:2019.12.3
Ni‐catalyzed C−O(Py) bond activation and silylation of aryl 2‐pyridyl ethers with silylzinc chlorides were carried out. This protocol allowed the 2‐pyridyloxy group to be substituted by a silyl group with short reaction times, mild reaction conditions, and good compatibility of functional groups.