该手稿描述了 Re 2 O 7在通过溶剂分解和弗里德尔-克来福特烷基化从苯甲醇合成二芳基甲烷中的应用。该反应的特点是底物范围广、催化剂负载量低、化学产率高和废物产生最少。在这些反应中,中间体高铼酸酯是优于氯化物和溴化物的离去基团。六氟异丙醇的极性和水封存能力对于这些过程的成功至关重要。Re 2 O 7是 HOReO 3的预催化剂,可作为这些反应的成本较低且易于处理的促进剂。氧铼催化剂在类似取代的乙酸酯存在下选择性地活化醇,这表明与布朗斯台德酸催化相比具有独特的化学选择性和机制。
Unsymmetrical Diarylmethanes by Ferroceniumboronic Acid Catalyzed Direct Friedel–Crafts Reactions with Deactivated Benzylic Alcohols: Enhanced Reactivity due to Ion-Pairing Effects
作者:Xiaobin Mo、Joshua Yakiwchuk、Julien Dansereau、J. Adam McCubbin、Dennis G. Hall
DOI:10.1021/jacs.5b05076
日期:2015.8.5
displays a broader scope compared to previously reported catalysts for similar Friedel-Crafts reactions of benzylicalcohols, including other boronic acids such as 2,3,4,5-tetrafluorophenylboronic acid. The efficacy of the new boronic acid catalyst was confirmed by its ability to activate primary benzylicalcohols functionalized with destabilizing electron-withdrawing groups like halides, carboxyesters
Two-component boronic acid catalysis for increased reactivity in challenging Friedel–Crafts alkylations with deactivated benzylic alcohols
作者:Hwee Ting Ang、Jason P. G. Rygus、Dennis G. Hall
DOI:10.1039/c9ob01043b
日期:——
report the use of perfluoropinacol as an effective co-catalyst to improve the reactivity of a boronic acid catalyst in the Friedel-Crafts benzylations of electronically deactivated primary and secondary benzylic alcohols. According to spectroscopic studies, it is believed that perfluoropinacol condenses with the arylboronic acid catalyst to form a highly electrophilic and Lewis acidic boronicester. This
Iron-Catalyzed Benzylation Reaction of Arenes with Benzyl Thiocyanates
作者:Jin-Heng Li、Ri-Yuan Tang、Xiao-Kang Guo、Dong-Yun Zhao、Xing-Guo Zhang、Chen-Liang Deng
DOI:10.1055/s-0031-1290343
日期:2012.3
A novel, regioselective protocol for the synthesis of diphenylmethane derivatives has been developed by using iron-catalyzed Friedel-Crafts reaction of arenes with benzyl thiocyanates. In the presence of FeBr3, a variety of benzyl thiocyanates underwent the reaction with arenes to selectively afford the corresponding diarylmethane derivatives in moderate to high yields.
Intermolecular Friedel–Crafts reaction catalyzed by InCl3
作者:Miho Kaneko、Ryuji Hayashi、Gregory R. Cook
DOI:10.1016/j.tetlet.2007.08.011
日期:2007.10
Our recent discovery that In(III) salts were able to activate halides catalytically under mild conditions for the intermolecular Friedel-Crafts cyclization prompted us to explore this highly efficient activation in intermolecular Friedel-Crafts reactions. The alkylation of p-xylene with allylic and benzylic halides was demonstrated under catalytic and mild condition to afford in some cases quantitative yields of the monoalkylated products without the need to employ large excesses of reactants. (c) 2007 Elsevier Ltd. All rights reserved.
Diarylmethane synthesis through Re<sub>2</sub>O<sub>7</sub>-catalyzed bimolecular dehydrative Friedel–Crafts reactions
作者:Qi Qin、Youwei Xie、Paul E. Floreancig
DOI:10.1039/c8sc03570a
日期:——
describes the application of Re2O7 to the syntheses of diarylmethanes from benzylic alcohols through solvolysis followed by Friedel–Craftsalkylation. The reactions are characterized by broad substrate scope, low catalyst loadings, high chemical yields, and minimal waste generation. The intermediate perrhenate esters are superior leaving groups to chlorides and bromides in these reactions. The polarity
该手稿描述了 Re 2 O 7在通过溶剂分解和弗里德尔-克来福特烷基化从苯甲醇合成二芳基甲烷中的应用。该反应的特点是底物范围广、催化剂负载量低、化学产率高和废物产生最少。在这些反应中,中间体高铼酸酯是优于氯化物和溴化物的离去基团。六氟异丙醇的极性和水封存能力对于这些过程的成功至关重要。Re 2 O 7是 HOReO 3的预催化剂,可作为这些反应的成本较低且易于处理的促进剂。氧铼催化剂在类似取代的乙酸酯存在下选择性地活化醇,这表明与布朗斯台德酸催化相比具有独特的化学选择性和机制。