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.
Electrophilic Vinylation of Thiols under Mild and Transition Metal‐Free Conditions
作者:Laura Castoldi、Ester Maria Di Tommaso、Marcus Reitti、Barbara Gräfen、Berit Olofsson
DOI:10.1002/anie.202002936
日期:2020.9
methodology displays high functional group tolerance and proceeds under mild and transition metal‐free conditions without the need for excess substrate or reagents. Mercaptothiazoles could be vinylated under modified conditions, resulting in opposite stereoselectivity compared to previous reactions with vinyliodonium salts. Novel VBX reagents with substituted benziodoxolonecores were prepared, and improved
Indium(I) Iodide Promoted Cleavage of Diphenyl Diselenide and Disulfide and Subsequent Palladium(0)-Catalyzed Condensation with Vinylic Bromides. A Simple One-Pot Synthesis of Vinylic Selenides and Sulfides
作者:Brindaban C. Ranu、Kalicharan Chattopadhyay、Subhash Banerjee
DOI:10.1021/jo052087i
日期:2006.1.1
a variety of substituted vinyl bromides in the presence of a catalytic amount of tetrakis(triphenylphosphine)palladium(0) [Pd(PPh3)4] in THF at room temperature to produce vinylic selenides and sulfides in good yields. The conversion of (E)-vinyl bromides is remarkably stereoselective giving (E)-vinyl selenides (and sulpfides) whereas the stereoselectivity in reaction of (Z)-vinyl bromides is not very
A new copper and iodine-mediated C–H oxidative sulfenylation of olefins with diaryl disulfides for the stereospecific synthesis of vinyl thioether is described.
Carbon Dioxide Mediated Stereoselective Copper-Catalyzed Reductive Coupling of Alkynes and Thiols
作者:Siti Nurhanna Riduan、Jackie Y. Ying、Yugen Zhang
DOI:10.1021/ol3003699
日期:2012.4.6
A simple protocol for the stereoselective copper-catalyzed hydrothiolation of alkynes under a CO2 atmosphere has been developed. The stereoselectivity is determined by the presence/absence of a CO2 atmosphere. The reaction system is robust and utilizes inexpensive, readily available substrates. A cyclic alkene/carboxylate copper complex intermediate is proposed as the key step in determining the stereoselectivity