Ruthenium-Catalyzed Carbon−Carbon Bond Formation via the Cleavage of an Unreactive Aryl Carbon−Nitrogen Bond in Aniline Derivatives with Organoboronates
作者:Satoshi Ueno、Naoto Chatani、Fumitoshi Kakiuchi
DOI:10.1021/ja0713431
日期:2007.5.1
refluxing toluene gave the corresponding phenylation product in 83% yield via aryl carbon−nitrogen bondcleavage. This reaction involves two notable features: (1) the coupling proceeds via the oxidative addition of an aryl carbon−nitrogen bond in anilines to the ruthenium complex, and (2) C−C bondformation takes place via transmetalation between the Ru−NR2 species and organoboronates.
Direct Observation of the Oxidative Addition of the Aryl Carbon−Oxygen Bond to a Ruthenium Complex and Consideration of the Relative Reactivity between Aryl Carbon−Oxygen and Aryl Carbon−Hydrogen Bonds
When RuH2(CO)(PPh3)3 was reacted with 2,2-dimethyl-1-(2-p-tolylphenyl)propan-1-one (2), the ruthenium-aryloxy complex 3 was obtained in 76% yield. The structure of this complex was determined from 1H and 31P NMR and X-ray data. Complex 3 showed the catalytic activity for the coupling of 2 with the phenylboronate 4. The 1H and 31P NMR studies of the reaction of Ru(CO)(PPh3)3 with o-aryloxy pivalophenone
Base‐Mediated Radical Borylation of Alkyl Sulfones
作者:Mingming Huang、Jiefeng Hu、Ivo Krummenacher、Alexandra Friedrich、Holger Braunschweig、Stephen A. Westcott、Udo Radius、Todd B. Marder
DOI:10.1002/chem.202103866
日期:2022.1.13
The utilization of inactivated alkyl sulfones as alkylradical precursors in a base-mediated borylation reaction with B2neop2 is reported, allowing direct access to valuable alkyl boronate esters without further transesterification. This approach is scalable and is tolerant to a variety of functional groups and substrates including complex molecules.
据报道,在与 B 2 neop 2的碱介导的硼基化反应中,利用失活的烷基砜作为烷基自由基前体,从而无需进一步酯交换即可直接获得有价值的烷基硼酸酯。这种方法具有可扩展性,并且能够耐受各种官能团和底物,包括复杂分子。
Ruthenium-Catalyzed Functionalization of Aryl Carbon−Oxygen Bonds in Aromatic Ethers with Organoboron Compounds
The ruthenium-catalyzed reaction of aryl ethers having a carbonyl group at the ortho position to the ether group with organoboronates (R-B(OCH2CMe2CH2O), R = aryl, alkenyl, and alkyl) resulted in site-selective C-C bond formation. Among the transition metal complexes screened, the RuH2(CO)(PPh3)3 complex showed the highest activity. Several aromatic ketones having methoxy or phenoxy groups at the ortho
在醚基邻位具有羰基的芳基醚与有机硼酸酯 (RB(OCH2CMe2CH2O),R = 芳基、烯基和烷基) 的钌催化反应导致位点选择性 CC 键的形成。在筛选出的过渡金属配合物中,RuH2(CO)(PPh3)3 配合物显示出最高的活性。几种在邻位具有甲氧基或苯氧基的芳族酮也可用于该偶联反应。各种含有给电子(NMe2、OMe、甲基和乙烯基)和吸电子(F 和 CF3)基团的芳基硼酸酯与甲氧基酮反应,以高产率得到相应的偶联产物。
Iodine-Catalyzed Borylation of Benzylic Alcohols
作者:Chunyu Yin、Lu Luo、Hua Zhang
DOI:10.1021/acs.orglett.3c00367
日期:2023.3.17
Direct borylation of benzylic alcohols has been achieved via an iodine-catalyzed process. This transition-metal-free borylation transformation is compatible with various functional groups and provides a practical and convenient method to access important and useful benzylic boronate esters from widely available benzylic alcohols. Preliminary mechanistic investigations indicated that benzylic iodide