Electrochemical Synthesis of Biaryls via Oxidative Intramolecular Coupling of Tetra(hetero)arylborates
作者:Arif Music、Andreas N. Baumann、Philipp Spieß、Allan Plantefol、Thomas C. Jagau、Dorian Didier
DOI:10.1021/jacs.9b12300
日期:2020.3.4
scope, scalability and robustness of this unconventional catalyst-free transformation, leading to functional-ized biaryls and ultimately furnishing drug-like small molecules as well as late stage derivatization of natural compounds. In addition, the observed selectivity of the oxidative coupling reaction is related to the electronic structure of the TABs through quantum-chemical calculations and experimental
Metal-Free and Redox-Neutral Conversion of Organotrifluoroborates into Radicals Enabled by Visible Light
作者:Wenbo Liu、Peng Liu、Leiyang Lv、Chao-Jun Li
DOI:10.1002/anie.201807181
日期:2018.10.8
through an SH2 process. This strategy is enabled by using water as the solvent, visible light as the energy input, and diacetyl as the promoter in the absence of any metal catalyst or redox reagent, thereby eliminating metal waste. To demonstrate its synthetic utility, an efficient acetylation to prepare valuable aryl (alkyl) methyl ketones is described and applications to construct C−C, C−I, C−Br
将有机硼化合物转化为相应的基团在有机化学中具有广泛的合成应用。为了实现这些转化,需要采用化学计量的各种强氧化剂如Mn(OAc)3,AgNO 3 / K 2 S 2 O 8和Cu(OAc)2,并通过单电子转移机理进行。本文确立了一种独特的策略,可通过S H从有机三氟硼酸盐生成芳基和烷基2过程。在没有任何金属催化剂或氧化还原试剂的情况下,通过使用水作为溶剂,使用可见光作为能量输入,使用二乙酰作为促进剂来启用此策略,从而消除了金属浪费。为了证明其合成用途,描述了一种有效的乙酰化反应以制备有价值的芳基(烷基)甲基酮,并且构造C-C,C-I,C-Br和C-S键的应用也是可行的。实验证据表明,三联体二乙酰是该过程的关键中间体。
Weak, bidentate chelating group assisted cross-coupling of C(sp<sup>3</sup>)–H bonds in aliphatic acid derivatives with aryltrifluoroborates
作者:Zhihua Cai、Shangda Li、Yuzhen Gao、Lei Fu、Gang Li
DOI:10.1039/c8cc07481j
日期:——
A protocol of Pd(II)-catalyzed, weak bidentate directing group assisted β-C(sp3)–H activation/cross-coupling with organoboron reagents has been achieved, affording arylation of aliphaticacidderivatives that contain α-hydrogen atoms in moderate to good yields. The potential of this method for an asymmetric β-C(sp3)–H arylation via desymmetrization was also presented.
Palladium(III)-Catalyzed Fluorination of Arylboronic Acid Derivatives
作者:Anthony R. Mazzotti、Michael G. Campbell、Pingping Tang、Jennifer M. Murphy、Tobias Ritter
DOI:10.1021/ja405919z
日期:2013.9.25
A practical, palladium-catalyzed synthesis of aryl fluorides from arylboronicacid derivatives is presented. The reaction is operationally simple and amenable to multigram-scale synthesis. Evaluation of the reaction mechanism suggests a single-electron-transfer pathway, involving a Pd(III) intermediate that has been isolated and characterized.
Photocatalyzed Transition‐Metal‐Free Oxidative Cross‐Coupling Reactions of Tetraorganoborates**
作者:Arif Music、Andreas N. Baumann、Florian Boser、Nicolas Müller、Florian Matz、Thomas C. Jagau、Dorian Didier
DOI:10.1002/chem.202005282
日期:2021.3
salts undergo selective coupling reactions under blue light irradiation in the presence of catalytic amounts of transition‐metal‐free acridinium photocatalysts to furnish unsymmetrical biaryls, heterobiaryls and arylated olefins. This represents an interesting conceptual approach to forge C−C bonds between aryl, heteroaryl and alkenyl groups under smooth photochemical conditions. Computational studies