A simple and efficient method for synthesis of sulfonyl chlorides/bromides by oxyhalogenation of thiols and disulfides with oxone-KX (X = Cl or Br) using water as the solvent is presented.
Conversion of thiols into sulfonyl halogenides under aerobic and metal-free conditions
作者:Marjan Jereb、Luka Hribernik
DOI:10.1039/c7gc00556c
日期:——
a redox-catalytic cycle. Sulfonyl chlorides and bromides were isolated without extraction and “filtered” over a short pad of silica gel; the use of solvents was greatly reduced in comparison with traditional isolation and purification. A “one-pot” protocol for the conversion of thiol into sulfonamide is also demonstrated. Scale-up experiments on the preparation of sulfonyl chloride and bromide are
开发了在硝酸铵,HCl和HBr的水溶液以及氧气作为末端氧化剂的情况下,由硫醇对环境无害,无金属的磺酰氯和溴化物的合成方法。检查了各种取代的硫酚,苄基,脂族和杂芳族硫醇的反应性。硝酸铵用作氮氧化物(NO / NO 2),它们是氧化还原催化循环中的关键参与者。无需萃取即可分离出磺酰氯和溴化物,并在短硅胶垫上“过滤”。与传统的分离和纯化方法相比,大大减少了溶剂的使用。还展示了用于将硫醇转化为磺酰胺的“一锅法”方案。显示了制备磺酰氯和溴化物的放大实验。讨论了可能的反应途径。
Sulfonyl halide synthesis by thiol oxyhalogenation using NBS/NCS – i PrOH
作者:Carolina Silva-Cuevas、Carlos Perez-Arrieta、Luis A. Polindara-García、J. Armando Lujan-Montelongo
DOI:10.1016/j.tetlet.2017.04.087
日期:2017.6
A rapid and facile method provides a general route to sulfonyl bromides/chlorides by the oxidation of thiols using NXS – ROH (X = Br,Cl, R = iPr) as an oxyhalogenation reagent. Control experiments suggest that the alcohol component is the source of oxygen. The proposed method enable the access to structurally diverse sulfonyl bromides and chlorides including challenging examples, inaccessible by other
一种快速而简便的方法,是使用NXS – ROH(X = Br,Cl,R = i Pr)作为氧卤代试剂氧化硫醇,从而提供了磺酰溴/氯化物的一般途径 。对照实验表明,酒精成分是氧气的来源。所提出的方法使得能够获得结构上不同的磺酰溴和氯化物,包括具有挑战性的实例,这是其他合成方法所无法达到的。
Oxidation of disulfides with electrophilic halogenating reagents: concise methods for preparation of thiosulfonates and sulfonyl halides
also effective in preparing sulfonyl fluorides from disulfides under the similar reaction conditions. Sulfonylchlorides or sulfonyl bromides were effectively obtained from the reaction of disulfides with 6 equiv of either N-chlorosuccinimide or N-bromosuccinimide in acetonitrile/water (10:1) at room temperature. Some other electrophilic chlorinating or brominating reagents are also able to be used instead