An aryl thiol–vinyl azide coupling reaction and a thiol–vinyl azide coupling/cyclization cascade: efficient synthesis of β-ketosulfides and arene-fused 5-methylene-2-pyrrolidinone derivatives
The addition reaction of thiol to vinyl azide has been extensively studied. Variously substituted aryl thiols are all viable for this coupling process. The scope of the other partner is successfully expanded from α-aryl vinyl azide to α-alkyl vinyl azide. A thiol–vinyl azide coupling/cyclization cascade is realized with substituted aryl vinyl azides carrying a 2-methoxycarbonyl group. The value of
Kinetic Study on the Reaction of (Arylthio)trimethylsilanes with Phenacyl Bromide Giving Aryl Phenacyl Sulfides and Bromotrimethylsilane
作者:Seizi Kozuka、Tetsuji Higashino、Takuro Kitamura
DOI:10.1246/bcsj.54.1420
日期:1981.5
A kinetic study has been conducted on the reactions of (arylthio)trimethylsilanes with phenacyl bromide giving aryl phenacyl sulfides and bromotrimethylsilane. Remarkably large positive substituent effect (ρ=+2.2) and large negative entropy of activation were observed for the reaction. A mechanism involving 5-coordinated silicon intermediate prior to the rate-determining heterolysis of the Si–S bond
Fluorium-Initiated Dealkylative Cyanation of Thioethers to Thiocyanates
作者:Yang Chen、Hongyi Qi、Ning Chen、Demin Ren、Jiaxi Xu、Zhanhui Yang
DOI:10.1021/acs.joc.9b00965
日期:2019.7.19
Thioethers are converted to thiocyanates via fluorium-initiated dealkylative cyanation. Selectfluor is used as the oxidant, and trimethylsilyl cyanide is used as the cyanation reagent. The well-streamlined procedure is user-friendly, operationally simple, and step-economical. The current mechanistic studies show that the sulfur radical cation and cyano radical are both involved. They combine to deliver
Novel Route to β-Chloro Vinyl Sulfones<i>via</i>the Action of Phosphorus Pentachloride on Phenacyl Aryl Sulfones in Chloroform
作者:Ezzat A. Hamed、Mohamed S.M. El-Saadi、Fatma M. El-Hegazy
DOI:10.1080/00397919508013871
日期:1995.11
the kinetics and mechanisms of nucleophilicsubstitution and elimination reactions of halo olefins1–3 so the aim of this work is to prepare compounds of the type C6H5CCI=CHSO2 and to study their behaviour towards elimination and substitutionreactions. Earlier preparation of these sulfones by thermal or copper-catalyzed addition of aryl sulfonyl bromides and chlorides to phenylacetylene reported a mixture