在25°C的水中和水-丙酮混合物中,已研究了取代的噻吩-2-磺酰溴和氯化物的水解。在水中以及在含最多40%丙酮的水丙酮中获得具有向上凹度的弯曲Hammett图。对于富含丙酮(> 80%)的溶剂,哈米特图变为氯化物和溴化物均具有正斜率的直线。根据亲核试剂-硫键的形成和硫,卤素键在取代基,核试剂和溶剂的改变上的断裂之间的不同时机,对结果进行了合理化处理。More O'Ferrall势能面模型的应用与S N 2型机制一致,该机制可以向S N 1或S A转移N个过程取决于不同的因素。另一方面,Pross最近提出的VBCM模型进行的预测与实验结果相矛盾。苯甲酰氯和噻吩-2-磺酰氯的某些溶剂分解反应之间的比较表明,这两个亲电子中心之间存在相似的相似性。
Facile Synthesis of Sulfonyl Chlorides/Bromides from Sulfonyl Hydrazides
作者:Rongxiang Chen、Shaohong Xu、Fumin Shen、Canran Xu、Kaikai Wang、Zhanyong Wang、Lantao Liu
DOI:10.3390/molecules26185551
日期:——
A simple and rapid method for efficient synthesis of sulfonyl chlorides/bromides from sulfonyl hydrazide with NXS (X = Cl or Br) and late-stage conversion to several other functional groups was described. A variety of nucleophiles could be engaged in this transformation, thus permitting the synthesis of complex sulfonamides and sulfonates. In most cases, these reactions are highly selective, simple
Rapid and Scalable Halosulfonylation of Strain‐Release Reagents**
作者:Helena D. Pickford、Vasyl Ripenko、Ryan E. McNamee、Serhii Holovchuk、Amber L. Thompson、Russell C. Smith、Pavel K. Mykhailiuk、Edward A. Anderson
DOI:10.1002/anie.202213508
日期:2023.1.16
hydrocarbons is described that proceeds under practical, scalable and mild conditions. Sulfonyl halides featuring aryl, heteroaryl and alkyl substituents are generated in situ from sulfinate salts and convenient halogen atom sources. This chemistry enables the synthesis of an array of halogen/sulfonyl-substituted bioisosteres and cyclobutanes, on up to multidecagram scale. Hal=Halogen.
An efficient and mild oxidative approach from thiols to sulfonyl derivatives with DMSO/HBr
作者:Hongye Wang、Zhaoting Li、Rongheng Dai、Ning Jiao、Song Song
DOI:10.1039/d3sc04945k
日期:——
A mild and practical method for synthesizing sulfonyl derivatives, which have a wide range of applications in pharmaceuticals, materials, and organic synthesis, was described through the oxidative functionalization of thiols with DMSO/HBr. The simple conditions, low cost and ready availability of DMSO/HBr, as well as the versatility of the transformations, make this strategy very powerful in synthesizing