Synthesis of 2,2′-Bipyridines via Suzuki-Miyaura Cross-Coupling
作者:Arne Lützen、Christoph Gütz
DOI:10.1055/s-0029-1217082
日期:2010.1
For a long time, the Suzuki-Miyauracross-couplingreaction could not be used for the synthesis of 2,2′-bipyridines due to the lack of sufficiently stable 2-pyridylboron compounds. Stabilized 2-pyridylboronic acid esters recently developed by Hodgson, however, were found to be ideally suited for this purpose. Two general protocols could be developed and demonstrated to be valuable alternatives, which
Palladium(0)-catalysed cross-coupling of 2-trimethylsilylpyridine with aryl halides
作者:David C. Blakemore、Louise A. Marples
DOI:10.1016/j.tetlet.2011.06.015
日期:2011.8
A general method for the Hiyama coupling reaction between arylhalides and 2-trimethylsilylpyridine has been developed. These conditions have been successfully applied to the synthesis of bis-heteroaryl systems, a key disconnection for the pharmaceutical industry in the synthesis of drug-like molecules.
Investigating the Role of Ligand Electronics on Stabilizing Electrocatalytically Relevant Low-Valent Co(I) Intermediates
作者:David P. Hickey、Christopher Sandford、Zayn Rhodes、Tobias Gensch、Lydia R. Fries、Matthew S. Sigman、Shelley D. Minteer
DOI:10.1021/jacs.8b12634
日期:2019.1.23
ranging from hydrogen evolution to C-H functionalization. However, the use of such complexes often requires polydentate, bulky ligands to stabilize the catalytically active Co(I) oxidation state from deleterious disproportionation reactions to enable the desired reactivity. Herein, we describe the use of bidentate electronically asymmetric ligands as an alternative approach to stabilizing transient Co(I)
High-Redox-Potential Chromophores for Visible-Light-Driven Water Oxidation at Low pH
作者:Lei Wang、David W. Shaffer、Gerald F. Manbeck、Dmitry E. Polyansky、Javier J. Concepcion
DOI:10.1021/acscatal.9b04034
日期:2020.1.3
Photochemical water oxidation at low pH requires chromophores with adequate photophysical properties and high redox potentials capable of oxidizing the catalysts. We report here a series of homoleptic Ru(II) polypyridyl complexes and their performances in photochemical water oxidation at pH 1 using persulfate as the sacrificial electronacceptor. These chromophores incorporate CF3 or PO3H2 groups to
低pH值的光化学水氧化需要具有足够光物理性质和能够氧化催化剂的高氧化还原电势的生色团。我们在这里报告了一系列均化的Ru(II)聚吡啶基配合物及其在使用过硫酸盐作为牺牲电子受体的pH 1的光化学水氧化中的性能。这些生色团结合了CF 3或PO 3 H 2基团,使Ru III / II标准电势相对于NHE增至1.3–1.6 V,而它们的同质性保留了与之相当的光物理特性(吸收光谱,寿命,发射能量,发射量子产率)。 [Ru(bpy)3 ] 2+。与[[bda)Ru(isq)2作为发色团,发色团在低pH值下以高活性促进可见光驱动的水氧化。具有膦酸酯基团作为取代基的发色团显示出比基于驱动力参数所预期的更高的活性。另外,测得的动力学同位素效应高达〜3,表明在催化剂和生色团之间以质子偶联的膦酸酯基作为质子受体参与了协调的质子偶联转移途径。因此,这些生色团在单个分子上执行Photosystem II中的P 6
Iridium/Bipyridine-Catalyzed <i>ortho</i>-Selective C–H Borylation of Phenol and Aniline Derivatives
作者:Hong-Liang Li、Motomu Kanai、Yoichiro Kuninobu
DOI:10.1021/acs.orglett.7b02936
日期:2017.11.3
ortho-selective C–H borylation of phenol and anilinederivatives has been successfully developed. Iridium/bipyridine-catalyzed C–H borylation generally occurred at the meta- and para-positions of aromatic substrates. Introduction of an electron-withdrawing substituent on the bipyridine-type ligand and a methylthiomethyl group on the hydroxy and amino groups of the phenol and aniline substrates, however, dramatically