A Convenient Preparation of Heteroaryl Sulfonamides and Sulfonyl Fluorides from Heteroaryl Thiols
作者:Stephen W. Wright、Kelly N. Hallstrom
DOI:10.1021/jo052164+
日期:2006.2.1
thiols may be oxidized to the sulfonyl chloride at low temperature (−25 °C) by using 3.3 equiv of aqueous sodium hypochlorite. The reaction is rapid, avoids the use of chlorine gas, and succeeds with substrates that have previously been found to afford little or none of the sulfonamide product with other procedures. The method allows the preparation of the sulfonylfluorides, which are stable enough to
Simple pyrimidines. Part XIV. The formation and reactions of some derivatives of simple pyrimidinesulphonic acids
作者:D. J. Brown、J. A. Hoskins
DOI:10.1039/p19720000522
日期:——
ne (1; R = Me) is oxidized by chloramine to a separable mixture of the corresponding sulphenamide (3; R = S·NH2) and disulphide; and by aqueous permanganate to the potassium sulphonate. This latter improved method also yields potassium 5-methylpyrimidine-2-sulphonate and the isomeric 4-methylpyrimidine-6-sulphonate. Appropriate sulphonates and sulphonamides react with hydrazine to give 2-hydrazino-4
适当的嘧啶-2-硫酮在二氟化氢钾的存在下与氯反应,生成嘧啶-2-磺酰氟(2; R = H,X = F)及其4-甲基,5-甲基和4,6-二甲基衍生物。在温和的条件下,它们与氨反应生成相应的磺酰胺,与胺反应生成例如。N(2)-乙基-4,6-二甲基嘧啶-2-磺酰胺(2; R = Me,X = NHEt); 也类似NN -二乙基-磺酰胺,2- sulphonomorpholide,NN -二- isopropylsulphonamide,和sulphonohydrazide(转化成其Ñ-异亚丙基衍生物)。在更剧烈的条件下,将整个含硫基团置换得到例如2-肼基-,2-二乙氨基-,2-叠氮基和2-甲氧基-4,6-二甲基嘧啶;还有2-肼基和2-叠氮基5-甲基嘧啶。每种磺酰氟与甲醇离子的反应速率取决于C-甲基取代基的数量和位置。4,6-二甲基嘧啶-2-硫酮(1; R = Me)被氯胺氧化成相应的亚磺酰胺(3;
DEAN, THOMAS R.
作者:DEAN, THOMAS R.
DOI:——
日期:——
US4761173A
申请人:——
公开号:US4761173A
公开(公告)日:1988-08-02
Sulfonyl Fluoride Synthesis through Electrochemical Oxidative Coupling of Thiols and Potassium Fluoride
作者:Gabriele Laudadio、Aloisio de A. Bartolomeu、Lucas M. H. M. Verwijlen、Yiran Cao、Kleber T. de Oliveira、Timothy Noël
DOI:10.1021/jacs.9b06126
日期:2019.7.31
Sulfonylfluorides are valuable synthetic motifs for a variety of applications, among which sulfur(VI) fluoride exchange-based “click chemistry” is currently the most prominent. Consequently, the development of novel and efficient synthetic methods to access these functional groups is of great interest. Herein, we report a mild and environmentally benign electrochemical approach to prepare sulfonyl