A novel protocol for the efficient activation of the Beckmannrearrangement utilizing the readily available sulfuryl fluoride (SO2F2 gas) is reported. The substrate scope of this methodology has been demonstrated by 37 examples with good to nearly quantitative isolated yields in a short time. A tentative mechanism was proposed involving formation and elimination of sulfonyl ester.
报道了一种利用容易获得的硫酰氟(SO 2 F 2气体)有效激活贝克曼重排的新方案。该方法的底物范围已通过37个实例证明,并在短时间内获得了良好至近乎定量的分离产率。提出了一种尝试性的机制,涉及形成和消除磺酰基酯。
Nickel-Catalyzed Cyanation of Phenol Derivatives with Zn(CN)<sub>2</sub> Involving C–O Bond Cleavage
作者:Yi Gan、Gaonan Wang、Xin Xie、Yuanhong Liu
DOI:10.1021/acs.joc.8b02498
日期:2018.11.16
An efficient nickel-catalyzed cyanation of aryl sulfonates, fluorosulfonates, and sulfamates with Zn(CN)2 was developed, which provides a facile access to the nitrile products in generally good to excellent yields. The reaction is accomplished by using NiII complex as the precatalyst and DMAP as the additive. The method also displays wide functional group compatibility; for example, keto, methoxy,
Sulfur(VI) fluoride compounds and methods for the preparation thereof
申请人:The Scripps Research Institute
公开号:US10117840B2
公开(公告)日:2018-11-06
This application describes a compound represented by Formula (I): (I) wherein: Y is a biologically active organic core group comprising one or more of an aryl group, a heteroaryl aryl group, a nonaromatic hydrocarbyl group, and a nonaromatic heterocyclic group, to which Z is covalently bonded; n is 1, 2, 3, 4 or 5; m is 1 or 2; Z is O, NR, or N; X1 is a covalent bond or —CH2CH2—, X2 is O or NR; and R comprises H or a substituted or unsubstituted group selected from an aryl group, a heteroaryl aryl group, a nonaromatic hydrocarbyl group, and a nonaromatic heterocyclic group. Methods of preparing the compounds, methods of using the compounds, and pharmaceutical compositions comprising the compounds are described as well.
Nickel-Catalyzed Carboxylation of Aryl and Heteroaryl Fluorosulfates Using Carbon Dioxide
作者:Cong Ma、Chuan-Qi Zhao、Xue-Tao Xu、Zhao-Ming Li、Xiang-Yang Wang、Kun Zhang、Tian-Sheng Mei
DOI:10.1021/acs.orglett.9b00836
日期:2019.4.5
The development of efficient and practical methods to construct carboxylic acids using CO2 as a C1 synthon is of great importance. Nickel-catalyzed carboxylation of aryl fluorosulfates and heteroaryl fluorosulfates with CO2 is described, affording arene carboxylic acids with good to excellent yields under mild conditions. In addition, a one-pot phenol fluorosulfation/carboxylation is developed.