PhI(OAc)2/KI-Mediated Reaction of Aryl Sulfinates with Alkenes, Alkynes, and α,β-Unsaturated Carbonyl Compounds: Synthesis of Vinyl Sulfones and β-Iodovinyl Sulfones
(Diacetoxyiodo)benzene [PhI(OAc) 2 , DIB] was able to promote the reaction of sodium aryl sulfinate and potassium iodide (KI) with alkenes and alkynes to afford the corresponding vinyl sulfones and β-iodovinyl sulfones, respectively, in good yields. The salient features of this reaction are that it employs a commercially available and environmentally benign hypervalent iodine(III) reagent, a one-step
Visible-light-induced surfactant-promoted sulfonylation of alkenes and alkynes with sulfonyl chloride by the formation of an EDA-complex with NaI in water at room temperature
scope, good functional group tolerance, simple operation, scalability and high chemical selectivity. Thus, it not only provided a green and efficient synthetic strategy for the preparation of β-iodo-substituted sulfone derivatives, but also enriched the investigation of visible-light-induced reactions in water.
Reactions of the free toluene-p-sulphonyl radical. Part I. Diagnostic reactions of free radicals
作者:C. M. M. da Silva Corrêa、William A. Waters
DOI:10.1039/j39680001874
日期:——
The free p·CH3·C6H4·SO2 radical is easily produced by the thermolysis or photolysis of p·Me·C6H4·SO2·l; copper powder assists the removal of iodine and so do radicals R2C(CN)·. Evidence is presented to show that p·Me·C6H4·SO2·l adds homolytically to olefins and that free p·Me·C6H4·SO2· radicals tend to disproportionate according to the equation: 6 Me·C6H4·SO2·→ 2(Me·C6H4·SO2)2O + Me·C6H4·S·SO2·C6H4·Me
p ·Me·C 6 H 4 ·SO 2 ·l的热解或光解容易产生游离的p ·CH 3 ·C 6 H 4 ·SO 2自由基;铜粉有助于去除碘,自由基R 2 C(CN)·也是如此。证据表明,p ·Me·C 6 H 4 ·SO 2 ·l向烯烃均溶,并且游离的p ·Me·C 6 H 4 ·SO 2 ·自由基根据以下方程式趋于歧化:6 Me· C 6H 4 ·SO 2 · → 2(Me·C 6 H 4 ·SO 2)2 O + Me·C 6 H 4 ·S·SO 2 ·C 6 H 4 ·Me p ·Me·C 6 H 4 ·SO 2 ·自由基添加醌给予ditoluene-的氧原子p quinols的-磺酸盐酯。芳基亚磺酰基基团似乎不具有类似的反应性。它们仅二聚为硫代磺酸酯Ar·S·SO 2 ·Ar。
CONVENIENT METHODS FOR THE PREPARATION OF VINYLIC AND ALLYLIC SULFONES FROM ALKENES
2-p-Toluenesulfonyl(=tosyl)-1-alkenes were regioselectively prepared from 1-alkenes via iodosulfonization or sulfonylmercuration, respectively. Conversion of 1-tosyl-1-alkenes to the corresponding allylic sulfones, 1-tosyl-2-alkenes, was achieved by the treatment of their acetonitrile solution with DBU in high yield.
N,N′-Disulfonylhydrazines: New sulfonylating reagents for highly efficient synthesis of (E)-vinyl sulfones at room temperature
作者:Dongping Luo、Lin Min、Weiping Zheng、Lidong Shan、Xinyan Wang、Yuefei Hu
DOI:10.1016/j.tet.2020.131019
日期:2020.3
has not been applied in organic synthesis except the formation of disulfones by self-dimerization of sulfonyl radicals. In this article, they were introduced as new sulfonylating reagents and their combinations with NIS and Et3N were established as excellent iodosulfonylating reagents for alkenes. Finally, a highly efficient method for the synthesis of (E)-vinyl sulfones was developed by mixing an alkene