Palladium-Catalyzed Aerobic Oxidative Dehydrogenation of Cyclohexenes to Substituted Arene Derivatives
作者:Andrei V. Iosub、Shannon S. Stahl
DOI:10.1021/ja512770u
日期:2015.3.18
system has been identified for aerobic dehydrogenation of substituted cyclohexenes to the corresponding arene derivatives. Use of sodium anthraquinone-2-sulfonate (AMS) as a cocatalyst enhances the product yields. A wide range of functional groups are tolerated in the reactions, and the scope and limitations of the method are described. The catalytic dehydrogenation of cyclohexenes is showcased in an efficient
Regio‐ and Stereoselective Thianthrenation of Olefins To Access Versatile Alkenyl Electrophiles
作者:Junting Chen、Jiakun Li、Matthew B. Plutschack、Florian Berger、Tobias Ritter
DOI:10.1002/anie.201914215
日期:2020.3.27
we report a regioselective alkenyl electrophile synthesis from unactivated olefins that is based on a direct and regioselective C-H thianthrenation reaction. The selectivity is proposed to arise from an unusual inverse-electron-demand hetero-Diels-Alder reaction. The alkenyl sulfonium salts can serve as electrophiles in palladium- and ruthenium-catalyzed cross-coupling reactions to make alkenyl C-C,
A novel vicinal aminotrifluoromethylation of alkenes using CF3SO2Na as a trifluoromethyl precursor and acetonitrile as an N-nucleophile has been achieved by an electrooxidative strategy. The present electrochemical protocol achieves efficient and highly regioselective difunctionalization of CC bonds under metal-free and external oxidant-free electrolysis conditions, leading to a series of β-trifluoromethylamine
已经通过电氧化策略实现了使用CF 3 SO 2 Na作为三氟甲基前体和乙腈作为N-亲核体的烯烃的邻位氨基三氟甲基化。本电化学方案在无金属和无外部氧化剂的电解条件下实现了C C键的高效且高度区域选择性的双官能化,从而产生了一系列具有良好至优异收率的β-三氟甲胺化合物。证实了该反应涉及自由基过程,因为CF 3自由基被清除剂捕获并且β-三氟甲基化自由基被BHT捕获,并且氘标记实验证明产物中的氧气来自水。
Selective Difunctionalization of Unactivated Aliphatic Alkenes Enabled by a Metal–Metallaaromatic Catalytic System
provided. These reactions produce 1,2-difunctionalized products with good yields and high levels of chemo-, regio-, and stereoselectivity. Our studies revealed the following: (i) The usually inert osmium center activates the N- or O-centered nucleophiles. (ii) The copper–osmium bonding and its cooperative effects play essential roles in control the selectivity by bringing the reaction components into