Acid/Phosphide-Induced Radical Route to Alkyl and Alkenyl Sulfides and Phosphonothioates from Sodium Arylsulfinates in Water
作者:Ya-mei Lin、Guo-ping Lu、Gui-xiang Wang、Wen-bin Yi
DOI:10.1021/acs.joc.6b02459
日期:2017.1.6
can in situ generate arylsulfenyl radicals. These radicals have high reactivity to react with alkynes, alkenes, and H-phosphine oxides for the synthesis of alkyl and alkenyl sulfides and phosphonothioates. The control experiments and quantum calculations are also performed to gain insights into the generation mechanism of arylsulfenyl radicals. Notably, the chemistry is free of thiol odors, organic solvents
This is the first example of stereoselective synthesis of E-vinyl sulfides in water in excellent yields by hydrothiolation of aromatic alkynes with thiophenols by anti-Markonikov addition in the presence of β-cyclodextrin. This protocol tolerates a wide variety of functional groups or substrates and does not require the use of transition-metal or base catalysts. β-Cyclodextrin can be recovered and reused for a number of runs without any loss of activity.
A new copper and iodine-mediated C–H oxidative sulfenylation of olefins with diaryl disulfides for the stereospecific synthesis of vinyl thioether is described.
描述了一种新的铜和碘介导的C-H氧化磺化方法,使用二芳基二硫化物对烯烃进行立体特异性合成乙烯硫醚。
Regioselective hydrothiolation of terminal acetylene catalyzed by magnetite (Fe<sub>3</sub>O<sub>4</sub>) nanoparticles
作者:Manuela S. T. Rocha、Jamal Rafique、Sumbal Saba、Juliano B. Azeredo、Davi Back、Marcelo Godoi、Antonio L. Braga
DOI:10.1080/00397911.2016.1262421
日期:2017.2.16
ABSTRACT Herein, we report a new and solvent-free methodology for the preparation of vinyl thioethers from terminal alkynes and thiols, using magnetite (Fe3O4) nanoparticles as a recyclable catalyst. With this greener method, the desired vinyl thioethers were achieved in good yields and with good stereoselectivity. In addition, the catalyst was easily recovered using a simple external magnet and reused
Stereoselective Formation of<i>Z</i>- or<i>E</i>-Vinyl Thioethers from Arylthiols and Acetylenes under Transition-Metal-Free Conditions
作者:Yunfeng Liao、Shanping Chen、Pengcheng Jiang、Hongrui Qi、Guo-Jun Deng
DOI:10.1002/ejoc.201300727
日期:2013.10
Vinyl sulfide formation with good yield and high regio- and stereoselectivities from thiols and acetylenesunder transition-metal-free conditions is described. Potassium phosphate was used as an effective additive to enhance the reaction yield and selectivity. Z-Vinyl sulfides were predominately formed in the presence of potassium phosphate, whereas E-vinyl sulfides were formed under solvent- and base-free