Three-component radical condensations involving benzoylmethyl radicals, alkenes, and diphenyl disulfide
摘要:
Acyl-substituted methyl radicals (RCOCH2.; R = H, Me, Ph), generated by photolysis of RCOCH2-HgCl, add to alkenes, enol ethers, or vinyl sulfides to give adduct radicals that are readily trapped by PhSSPh to yield a three-component condensation product. The presence of an alkali metal carbonate is crucial in preventing side reactions resulting in the conversion of the mercurial to RCOCH3 by PhSH formed in the photolysis.
Benzyne-induced ring opening reaction of thiiranes. Efficient synthesis of phenyl vinyl sulfides
作者:Juzo Nakayama、Satoshi Takeue、Masamatsu Hoshino
DOI:10.1016/s0040-4039(01)81261-2
日期:1984.1
A series of thiiranes react with benzyne to provide an efficient synthesis of phenyl vinyl sulfides. The reaction is stereospecific, thus producing cis-(phenylthio)-stilbene from cis-2,3-diphenylthiirane and trans-(phenylthio)stilbene from trans-2,3-diphenylthiirane.
Safe and Metal-Free Synthesis of 1-Alkenyl Aryl Sulfides and Their Sulfones from Thiiranes and Diaryliodonium Salts
作者:Jiaxi Xu、Jun Dong
DOI:10.1055/s-0036-1591559
日期:2018.6
These sulfides were further oxidized with performic acid to the corresponding sulfones. The current method provides a metal-free and safe method for the preparation of 1-alkenyl aryl sulfides and their sulfones. A series of 1-alkenyl aryl sulfides was synthesized from thiiranes and diaryliodonium salts in tetrahydrofuran in the presence of potassium tert-butoxide. The proposed reaction mechanism involves
General Synthesis of Alkenyl Sulfides by Palladium-Catalyzed Thioetherification of Alkenyl Halides and Tosylates
作者:Noelia Velasco、Cintia Virumbrales、Roberto Sanz、Samuel Suárez-Pantiga、Manuel A. Fernández-Rodríguez
DOI:10.1021/acs.orglett.8b00854
日期:2018.5.18
ligand is reported. These reactions occur under low catalyst loading and in high yields and display widescope, including the coupling of bulky thiols and trisubstituted bromoolefins, and functional group tolerance. In addition, the thioetherification of less reactive chloroalkenes and, for the first time, alkenyl tosylates was accomplished using a catalyst generated from CyPFtBu alkylbisphosphine ligand
据报道,链烯基溴化物与硫醇的交联反应是由廉价dppf配体衍生的钯配合物催化的。这些反应在低催化剂负载和高收率下发生,并显示出较宽的范围,包括大体积硫醇和三取代溴代烯烃的偶联以及官能团的耐受性。另外,使用由CyPF t Bu烷基双膦配体产生的催化剂实现了反应性较低的氯代烯烃的硫醚化以及首次甲苯基甲苯磺酸酯的硫醚化。
Synthesis of β-fluoroalkyl phenyl (or methyl) thioethers by sulfur-assisted halogen exchange with triethylamine tris-hydrofluoride
作者:C. Saluzzo、G. Alvernhe、D. Anker、G. Haufe
DOI:10.1016/s0022-1139(00)82399-4
日期:1990.5
The exchange of chlorine in β-chloroalkyl phenyl (or methyl) thioethers by fluorine, with anchimericassistance of sulfur, is very easily realized with the almost neutral fluorinating reagent, Et3N.3HF. The ‘one-pot’ reactions of alkenes with sulfenyl chlorides and subsequently with Et3N.3HF lead to the corresponding β-fluoroalkyl thioethers in high yields.
Synthesis of α-Methylene-β-hydroperoxy Sulfoxides by Regioselective Photooxygenation (Schenck Reaction) of Racemic Vinyl Sulfoxides
作者:Waldemar Adam、A. Sampath Kumar、Chantu R. Saha-Möller
DOI:10.1055/s-1995-4138
日期:1995.12
The β-hydroperoxy vinyl sulfoxides 3 were synthesized in good to excellent yields by regioselective photooxygenation of racemic vinyl sulfoxides 2. Moderate diastereoselectivities were observed in the ene reaction of singlet oxygen (Schenck Reaction) with the E- or Z-vinyl sulfoxides 2e. Titanium-catalyzed oxygen transfer reaction of these sulfoxy-functionalized racemic allylic hydroperoxides 3 resulted chemoselectively in the corresponding sulfones 5.