A new protocol for the directsulfonylation of benzylic, allylic and homoallylic alcohols with sodiumarenesulfinates is described by using iron(III) chloride as a catalyst and chlorotrimethylsilane as an additive. This method requires no preactivation of alcohols. Surprisingly in the reaction with homoallyl alcohols nucleophilic addition of sulfinate anion, occurs at the terminal double bond instead
Base and solvent mediated decomposition of tosylhydrazones: highly selective synthesis of N-alkyl substituted hydrazones, dialkylidenehydrazines, and oximes
作者:Qiang Sha、Yunyang Wei
DOI:10.1016/j.tet.2013.03.055
日期:2013.5
Base and solvent mediated decomposition of tosylhydrazones was studied. It was found that reaction of tosylhydrazones in CH3NO2 in the presence of 1 equiv of K2CO3 in 90 degrees C gave N-alkylated products in 52-96% yield. However, when the same reaction was carried out in mixed solvent of CH3NO2 and dioxane in the presence of 3 equiv of NaOH at 110 degrees C, dialkylidenehydrazines were obtained in moderate to high yield. If the reaction was carried out in mixed solvent of CH3NO2 and DMSO in the presence of 10 equiv of NaOH at 110 degrees C, CH3NO2 can act as the precursor of hydroxylamine and corresponding oximes were formed in up to 92% yield. (C) 2013 Elsevier Ltd. All rights reserved.
Reactions of Organic Anions; XCIV<sup>1</sup>. Catalytic Two-Phase Alkylation of Benzyl Sulfones and Sulfonamides
GOLINSKI J.; JOSCZYK A.; MAKOSZA M., SYNTHESIS, 1979, NO 6, 461-463
作者:GOLINSKI J.、 JOSCZYK A.、 MAKOSZA M.
DOI:——
日期:——
Denitrogenation of tosylhydrazones: synthesis of aryl alkyl sulfones catalyzed by a phenalenyl-based molecule
作者:Shiv Kumar、Paramita Datta、Anup Bhunia、Swadhin K. Mandal
DOI:10.1039/d3cy01194a
日期:——
Sulfur-containing organic molecules such as sulfones are prevalent in pharmaceuticals and agrochemicals. Herein, we report the first transition-metal-free process for in situ denitrogenation of tosylhydrazones to produce a diverse array of aryl alkyl sulfones. We have used phenalenyl-based odd alternant hydrocarbon as a photoredox catalyst for denitrogenation of tosylhydrazones, where the phenalenyl