Pyridine-Catalyzed Radical Borylation of Aryl Halides
作者:Li Zhang、Lei Jiao
DOI:10.1021/jacs.6b11813
日期:2017.1.18
A pyridine-catalyzed transition-metal-free borylation reaction of haloarenes has been developed based on the selective cross-coupling of an aryl radical and a pyridine-stabilized boryl radical. Arylboronates were produced from haloarenes under mild conditions. This borylation reaction features a broad substrate scope, operational simplicity, and gram-scale synthetic ability.
Synthesis of Trisubstituted Alkenyl Boronic Esters from Alkenes Using the Boryl-Heck Reaction
作者:William B. Reid、Donald A. Watson
DOI:10.1021/acs.orglett.8b02949
日期:2018.11.2
The direct borylation of disubstituted alkenes is reported. These conditions allow for the conversion of a variety 1,1- and 1,2-disubstituted alkenes to trisubstituted alkenyl boronic esters with outstanding yields and excellent E/Z selectivities. The utility of this reaction has been demonstrated with several downstream functionalization reactions, which allow access to diverse, stereodefined, functionalized
作者:Saswata Gupta、Siyuan Su、Yu Zhang、Peng Liu、Donald J. Wink、Daesung Lee
DOI:10.1021/jacs.1c02237
日期:2021.5.19
demonstrated them as an aromatic equivalent of the Grubbs-type ruthenium alkylidene catalysts. These ruthenabenzenes can be prepared via an enyne metathesis and metallotropic [1,3]-shift cascade process to form alkyne-chelated ruthenium alkylidene intermediates followed by spontaneous cycloaromatization. The aromatic nature of these complexes was confirmed by spectroscopic and X-ray crystallographic data
金属芳烃构成了一类独特的芳族化合物,其中一种或多种过渡金属元素结合到芳族体系中,其母体是金属苯。与碳原型相比,金属苯的主要关注点之一通常涉及与其相对芳香性相关的结构特征。含过渡金属的金属苯也涉及某些催化过程,例如炔烃复分解聚合;然而,这些基于过渡金属的金属芳族化合物尚未开发为催化剂。在此,我们描述了一种生成多种钌苯的有效策略,并将它们证明为 Grubbs 型钌亚烷基催化剂的芳族等价物。这些钌苯可以通过烯炔复分解和金属化[1,3]-移位级联工艺制备,形成炔烃螯合的亚烷基钌中间体,然后自发环芳构化。这些配合物的芳香性质通过光谱和 X 射线晶体学数据得到证实,并通过 DFT 计算研究了环芳构化过程的机理途径。这些钌苯对复分解和其他转化表现出强大的催化活性,这说明金属苯不仅是具有结构和理论意义的化合物,而且还是开发新催化剂的新平台。这些配合物的芳香性质通过光谱和 X 射线晶体学数据得到证实,并通过
Efficient heterogeneous hydroboration of alkynes: enhancing the catalytic activity by Cu(0) incorporated CuFe<sub>2</sub>O<sub>4</sub> nanoparticles
Nano-copper ferrite supported Cu catalysts are active for hydroboration of alkynes to vinylboronates.
纳米铜铁氧体负载的铜催化剂对炔烃的氢硼化反应具有活性,生成乙烯硼酸酯。
A recyclable Ru(CO)Cl(H)(PPh<sub>3</sub>
)<sub>3</sub>
/PEG catalytic system for regio- and stereoselective hydroboration of terminal and internal alkynes
This paper reports on the first repetitive batch selective hydroboration of terminal and internalalkynes in a series of poly(ethylene glycols) (PEGs), used as solvents and media for the immobilization of a Ru(CO)Cl(H)(PPh3)3 catalyst. The system based on 2 mol% of Ru−H complex and poly(ethylene glycol) with α‐methyl/ω‐trimethylsilyl ending groups (Mw=2000) was found to be the most efficient, and was