此处报道的是氧化还原中性Ni II / Ni II催化循环的发现,该催化循环首次能够将未活化烯烃与芳基硼酸进行线性选择性加氢芳基化。这种新颖的催化循环可通过使用富电子的二亚胺配体实现,具有广泛的底物范围,并且在温和的反应条件下,在没有其他氧化剂和还原剂的情况下具有出色的官能团和杂环相容性。使用动力学分析和氘标记实验的机理研究表明,质子化是该氧化还原中性催化的速率决定步骤,也是新开发的二亚胺-Ni催化剂的可逆链走性质。
Atmospheric Oxygen Mediated Radical Hydrothiolation of Alkenes
作者:Ruairí O. McCourt、Eoin M. Scanlan
DOI:10.1002/chem.202002542
日期:2020.12.4
hydrothiolation of alkenes (and alkyne) is reported. A variety of sulfur containing motifs including alkanethiols, thiophenols and thioacids undergo an atmospheric oxygen‐mediated radical hydrothiolation reaction with a plethora of alkenes in good yield with excellent functional group compatibility, typically with short reaction times to furnish a range of functionalized products. Biomolecules proved
Oxidative Hydro-, Bromo-, and Chloroheptafluoroisopropylation of Unactivated Alkenes with Heptafluoroisopropyl Silver
作者:Chao-Lai Tong、Xiu-Hua Xu、Feng-Ling Qing
DOI:10.1021/acs.orglett.9b03705
日期:2019.12.6
three-component hydro-, bromo-, and chloroheptafluoroisopropylation of unactivatedalkenes are disclosed. In these reactions, the CF(CF3)2 radical was generated from the oxidation of AgCF(CF3)2. Then the addition of this perfluorinated radical to alkenes, followed by hydrogenation, bromination, or chlorination, gave the corresponding difunctionalizedCF(CF3)2-containing products in high yields.
Hydrosulfonylation of Unactivated Alkenes by Visible Light Photoredox Catalysis
作者:Juan-Juan Wang、Wei Yu
DOI:10.1021/acs.orglett.9b03636
日期:2019.11.15
hydrosulfonylation of unactivated alkenes with sodium sulfinates was realized via [Ir(dF(CF3)ppy)2(dtbbpy)]PF6-mediated visiblelightphotoredoxcatalysis. The presence of an acid such as acetic acid is essential for the reaction to take place. A variety of unactivated alkenes can be transformed into sulfones with good yield and high regioselectivity using this reaction, which is proposed to proceed by a radical
Catalytic and Structural Studies of Hoveyda-Grubbs Type Pre-Catalysts Bearing Modified Ether Ligands
作者:Stefano Guidone、Enguerrand Blondiaux、Cezary Samojłowicz、Łukasz Gułajski、Mariusz Kędziorek、Maura Malińska、Aleksandra Pazio、Krzysztof Woźniak、Karol Grela、Angelino Doppiu、Catherine S. J. Cazin
DOI:10.1002/adsc.201200385
日期:2012.10.8
Catalytic and crystallographic studies of Hoveyda–Grubbstypepre-catalysts M51TM and M52TM were performed. These two new instruments in the olefin metathesis catalyst toolbox were shown to be active at ambient temperature and at low loading, leading to clean formation of ring-closing, ring-closing enyne and cross metathesis products.
Hoveyda-type complexes have been synthesised and fully characterised. Their ability to suppress undesired double-bond migration along the carbon chain during metathesis reactions was examined. It was proved that these catalysts decrease the amounts of undesired side-products with a shifted doublebond in the reaction mixture.