Nickel-Catalyzed Suzuki–Miyaura Reaction of Aryl Fluorides
摘要:
Two protocols for the nickel-catalyzed cross-coupling of aryl fluorides with aryl boronic esters have been developed. The first employs metal fluoride cocatalysts, such as ZrF4 and TiF4, which enable Suzuki-Miyaura reactions of aryl fluorides bearing electron-withdrawing (ketones, esters, and CF3), aryl and alkenyl groups as well as those comprising fused aromatic rings, such as fluoronaphthalenes and fluoroquinolines. The second protocol employs aryl fluorides bearing ortho-directing groups, which facilitate the difficult C-F bond activation process via cyclometalation. N-heterocycles, such as pyridines, quinolines, pyrazoles, and oxazolines, can successfully promote cross-coupling with an array of organoboronic esters. A study into the substituent effects with respect to both coupling components has provided fundamental insights into the mechanism of the nickel-catalyzed cross-coupling of aryl fluorides.
Directing Group‐Promoted Inert C−O Bond Activation Using Versatile Boronic Acid as a Coupling Agent
作者:Ram Ambre、Ting‐Hsuan Wang、Anmei Xian、Yu‐Shiuan Chen、Yu‐Fu Liang、Titel Jurca、Lili Zhao、Tiow‐Gan Ong
DOI:10.1002/chem.202004132
日期:2020.12.18
strategy facilitates the efficient catalytic cross‐coupling of methoxyarenes with a variety of organoboronreagents. Directing groups facilitate the activation of inert C−O bonds in under‐utilized aryl methyl ethers enabling their adaptation for C−C cross‐coupling reactions as less toxic surrogates to the ubiquitous haloarenes. The method reported enables C−C cross‐coupling with readily available and economical
Hydrophilic (η<sup>6</sup>-Arene)–Ruthenium(II) Complexes with P–OH Ligands as Catalysts for the Isomerization of Allylbenzenes and C–H Bond Arylation Reactions in Water
Half-sandwich ruthenium(II) complexes containing η6-coordinated 3-phenylpropanol and phosphinous-acid-type ligands, namely, [RuCl2(η6-C6H5CH2CH2CH2OH)P(OH)R2}] (R = Me (2a), Ph (2b), 4-C6H4CF3 (2c), 4-C6H4OMe (2d), OMe (2e), OEt (2f), and OPh (2g), have been synthesized in 44–88% yield by reacting [RuCl2η6:κ1(O)-C6H5CH2CH2CH2OH}] (1) with the appropriate pentavalent phosphorus oxide R2P(═O)H. The
含η半夹心钌(II)配合物6配位的3-苯基丙醇和亚膦酸基型配体,即,将[RuCl 2(η 6 -C 6 H ^ 5 CH 2 CH 2 CH 2 OH)P(OH) R 2 }](R = Me(2a),Ph(2b),4-C 6 H 4 CF 3(2c),4-C 6 H 4 OMe(2d),OMe(2e),OEt(2f),和OPh(2克),已在44-88%的产率通过反应而合成将[RuCl 2 η 6:κ 1(Ò)-C 6 H ^ 5 CH 2 CH 2 CH 2 OH}](1)与适当的五价磷氧化物R 2 P(= O)H。的结构将[RuCl 2(η 6 -C 6 H ^ 5 CH 2 CH 2 CH 2 OH)P(OH)Me 2 }](2A)通过X射线衍射方法进行了明确地证实。化合物2a – g被证明是催化活性在allylbenzenes的异构化为相应的(1-丙烯基)采用水作为唯一的反应溶剂,用将[RuCl苯衍生物2(η
Nickel‐Catalyzed Intramolecular Coupling of Sulfones via the Extrusion of Sulfur Dioxide
We describe a method for intramolecular desulfonylative coupling using bis(cyclooctadiene)nickel as a catalyst. A broad range of aromatic, heteroaromatic and aliphatic sulfones can be utilized as substrates in this process. This method provides an atom‐economical route to the synthesis of various biaryls and an efficient tool for the catalytic conversion of sulfonyl groups, representing a significant
simple approach for palladium-catalyzed C–H functionalization reactions utilizing an organophosphorus/sulfonate hypervalent iodine reagent as both an oxidant and the source of a functional group has been developed. Through this method, the oxidative phosphorylation-, sulfonation-, and hydroxylation of unactivated benzyl C(sp3)–H bonds, along with the hydroxylation and arylation of aryl C(sp2)–H bonds,
Palladium-Catalyzed Decarboxylative Arylation of C−H Bonds by Aryl Acylperoxides
作者:Wing-Yiu Yu、Wing Nga Sit、Zhongyuan Zhou、Albert S.-C. Chan
DOI:10.1021/ol900756g
日期:2009.8.6
bond was developed using aryl acylperoxides as inexpensive aryl sources. Substrates containing pyridyl, oxime, and oxazoline groups undergo effectively ortho-selective C−H arylation with excellent functional group tolerance. This arylation should begin by directing-group-assisted cyclopalladation, followed by the reaction of the palladacycle with aryl radicals generated in situ by thermal decomposition