通过引入磺酸基,成功合成了六种具有两亲性的杯芳烃[ n ]芳烃基布朗斯台德酸型催化剂。使用FTIR,1 H NMR,13 C NMR,APT-NMR和元素分析技术对它们的结构进行表征。此外,在2-甲基呋喃和/或N-甲基吲哚与某些仲醇在水性介质中的偶联反应中评估了它们的催化能力。还研究了它们的表面活性剂能力,水用量和反应时间对这些两亲杯芳烃[ n ]芳烃衍生物的催化活性的影响。观察表明,这些两亲杯[在2-甲基呋喃和N-甲基吲哚与某些醇在水中的偶联反应中,n ]芳烃催化剂表现出高催化活性。
A simple and efficient alkylation of aromatic and heteroaromatic compounds via the direct SN1-type nucleophilic substitution of benzylic alcohols in the presence of catalytic amounts of the strong Brønsted acid o-benzenedisulfonimide under neat conditions is herein reported. A library of di- and triaryl (and heteroaryl) methanes was prepared in good yields and high regioselectivity. The observed reactivity
本文报道了在纯净条件下,在催化量的强布朗斯台德酸邻苯二磺酰亚胺存在下,通过苄基醇的直接S N 1型亲核取代,对芳香族和杂芳香族化合物进行的简单有效烷基化。以高收率和高区域选择性制备了二芳基和三芳基(和杂芳基)甲烷的库。已证明观察到的反应性与Mayr的亲核性和亲电子性等级相符。
Surfactant-Type Brønsted Acid Catalyzed Dehydrative Nucleophilic Substitutions of Alcohols in Water
作者:Seiji Shirakawa、Shū Kobayashi
DOI:10.1021/ol062813j
日期:2007.1.1
A protocol for the dehydrative nucleophilicsubstitution of benzyl alcohols with a variety of carbon- and heteroatom-centered nucleophiles using dodecylbenzenesulfonic acid (DBSA) as a surfactant-type Bronsted acid catalyst in water has been developed. The reaction system can be applied to the stereoselective C-glycosylation of 1-hydroxy sugars in water. [reaction: see text].
Au(III)/TPPMS-Catalyzed Benzylation of Indoles with Benzylic Alcohols in Water
作者:Hidemasa Hikawa、Hideharu Suzuki、Isao Azumaya
DOI:10.1021/jo402151g
日期:2013.12.6
A novel and efficient method for the Au(III)/TPPMS-catalyzed direct substitution reaction of benzhydryl and benzylic alcohols with indoles in water is developed. Au(III)/TPPMS is an effective catalyst for the benzylation of the strong pi nucleophile 1-methylindole, while common Bronsted or Lewis acids are ineffective.
Brønsted acidic magnetic nano-Fe3O4-adorned calix[n]arene sulfonic acids: synthesis and application in the nucleophilic substitution of alcohols
作者:Serkan Sayin、Mustafa Yilmaz
DOI:10.1016/j.tet.2014.06.034
日期:2014.9
Three magnetically recoverable Bronsted acidic calix[n]arene derivatives were successfully constructed by immobilizing calix[n]arene sulfonic acids onto silica-coated magnetic nanoparticles, a process, which allows calix[n]arene derivatives to acquire magnetic properties. All of the magnetically recoverable Bronsted acidic calix[n]arenes efficiently catalyze the coupling of electron-rich arenes with some alcohols in water. After separation and recovery from the reaction mixture by a simple magnet, these Bronsted acidic calix[n]arenes can be recycled many times without losing their catalytic activity. (C) 2014 Elsevier Ltd. All rights reserved.
Synthesis and investigation of catalytic affinities of water-soluble amphiphilic calix[n]arene surfactants in the coupling reaction of some heteroaromatic compounds
作者:Serkan Sayin、Mustafa Yilmaz
DOI:10.1016/j.tet.2016.08.066
日期:2016.10
their surfactant abilities, and the effects of water amount used and reaction durations on the catalytic activities of these amphiphilic calix[n]arene derivatives were also investigated. Observations indicated that these amphiphilic calix[n]arene catalysts exhibited high catalytic activities in the coupling reactions of 2-methylfuran and N-methylindole with some alcohols in water.
通过引入磺酸基,成功合成了六种具有两亲性的杯芳烃[ n ]芳烃基布朗斯台德酸型催化剂。使用FTIR,1 H NMR,13 C NMR,APT-NMR和元素分析技术对它们的结构进行表征。此外,在2-甲基呋喃和/或N-甲基吲哚与某些仲醇在水性介质中的偶联反应中评估了它们的催化能力。还研究了它们的表面活性剂能力,水用量和反应时间对这些两亲杯芳烃[ n ]芳烃衍生物的催化活性的影响。观察表明,这些两亲杯[在2-甲基呋喃和N-甲基吲哚与某些醇在水中的偶联反应中,n ]芳烃催化剂表现出高催化活性。