Environmentally Friendly and Recyclable CuCl2-Mediated C–S Bond Coupling Strategy Using DMEDA as Ligand, Base, and Solvent
作者:Guodong Shen、Xianqiang Huang、Qichao Lu、Zeyou Wang、Weiwei Sun、Yalin Zhang、Manman Sun、Zhiming Wang
DOI:10.1055/a-1561-5508
日期:2022.1
Simple reaction conditions and recyclable reagents are crucial for environmentally friendly industrial applications. An environment-friendly, recyclable and economic strategy was developed to synthesize diaryl chalcogenides by the CuCl2-catalyzed C–S bond-formation reaction via iodobenzenes and benzenethiols/1,2-diphenyldisulfanes using N,N′-dimethylethane-1,2-diamine (DMEDA) as ligand, base, and solvent
Catalytic Asymmetric Electrochemical α‐Arylation of Cyclic β‐Ketocarbonyls with Anodic Benzyne Intermediates
作者:Longji Li、Yao Li、Niankai Fu、Long Zhang、Sanzhong Luo
DOI:10.1002/anie.202006016
日期:2020.8.17
herein is an electrochemical approach for the oxidative generation of benzynes (cyclohexyne) and its successful merging with chiral primary aminocatalysis, formulating the first catalytic asymmetric enamine–benzyne (cyclohexyne) coupling reaction. Cobalt acetate was identified to stabilize the in situ generated arynes and facilitate its coupling with an enamine. This catalytic enamine‐benzyne protocol
diaryl selenides has been developed by a copperferritenanoparticle catalyzed reaction of aryl iodides/aryl bromides with diphenyldiselenide in the presence of base and solvent at 120 °C. Using this protocol, a variety of diselenides were obtained in good to excellent yields. The copperferritenanoparticles were magnetically separated, recycled, and reused up to three cycles.
在碱和溶剂存在下,在 120 °C 下,通过铁氧体铜纳米粒子催化芳基碘化物/芳基溴化物与二苯基二硒化物反应,开发了一种简单有效的合成二芳基硒化物的方法。使用该协议,以良好到极好的收率获得了多种二硒化物。铜铁氧体纳米粒子被磁性分离、回收和重复使用最多三个循环。
Copper-catalyzed <i>ipso</i>-selenation of aromatic carboxylic acids
The copper-catalyzeddecarboxylative selenation of aromaticcarboxylicacids with diselenide is reported. This transformation tolerated a diverse set of functional groups on the substrates, including pentafluorobenzoic acid and heteroaromatic acids, delivering diaryl and methyl aryl selenides in good to excellent yields. Mechanistic studies indicated that the copper catalyst is essential in the activation
Selenium–Nitrogen Bond Cleavage in Selenazole Ring System with Grignard Reagent: A Convenient Synthesis of Unsymmetrically Substituted Selenides
作者:Rafał Lisiak、Jacek Młochowski
DOI:10.1080/00397910902730994
日期:2009.7.29
reactivity of the selenenamide bond in selenazoles toward nucleophiles can be exploited for synthesis of other organoselenium compounds. It has been found that benzisoselenazol-3(2H)-ones and related selenaheterocycles with an Se-N moiety treated with Grignard reagent gave unsymmetrical aryl-aryl and aryl-alkyl selenides in moderate to good yields. This reaction has a synthetic value because it is highly