nickel-catalyzed oxidative dehydrogenative coupling reaction of alkane with thiol for the construction of C(sp3)-S bond has been established, affording more than 50 alkyl thioethers. Notably, pharmaceutical and agrochemicals, such as Provigil, Chlorbenside and Pyridaben, were readily synthesized by this approach. The sterically hindered ligand BC and disulfide which was formed in situ oxidation of thiol, efficiently
Mechanistic Study of a Photocatalyzed CS Bond Formation Involving Alkyl/Aryl Thiosulfate
作者:Yiming Li、Weisi Xie、Xuefeng Jiang
DOI:10.1002/chem.201502951
日期:2015.11.2
This study presents thioether construction involving alkyl/aryl thiosulfates and diazonium salt catalyzed by visible‐light‐excited [Ru(bpy)3Cl2] at room temperature in 44–86 % yield. Electron paramagnetic resonance studies found that thiosulfate radical formation was promoted by K2CO3. Conversely, radicals generated from BnSH or BnSSBn (Bn=benzyl) were clearly suppressed, demonstrating the special
这项研究提出了在室温下可见光激发[Ru(bpy)3 Cl 2 ]催化的含烷基/芳基硫代硫酸盐和重氮盐的硫醚结构,产率为44-86%。电子顺磁共振研究发现,K 2 CO 3促进了硫代硫酸根的形成。相反,从BnSH或BnSSBn(Bn =苄基)生成的自由基被明显抑制,证明了该系统中硫代硫酸盐的特殊性质。瞬态吸收光谱证实了[Ru(bpy)3 Cl 2 ]与4-MeO-苯基重氮盐之间的电子转移过程,其速率常数为1.69×10 9 M -1 s -1。通过X射线衍射确认了相应的自由基捕获产物。确定了完整的反应机理以及发射猝灭数据。此外,该系统有效地避免了在含有Ru 2+的光激发体系中H 2 O引起的硫化物过氧化。研究了具有各种电子性质的芳基和杂芳基重氮盐的合成兼容性。烷基和芳基取代的硫代硫酸盐都可用作底物。值得注意的是,药物衍生物在温和的条件下能够平稳地进行后期硫化。
Stereoselective Control by Face-to-Face Versus Edge-to-Face Aromatic Interactions: The Case of<i>C</i><sub>3</sub>-Ti<sup>IV</sup>Amino Trialkolate Sulfoxidation Catalysts
作者:Gabriella Santoni、Miriam Mba、Marcella Bonchio、Williamâ A. Nugent、Cristiano Zonta、Giulia Licini
DOI:10.1002/chem.200902072
日期:2010.1.11
The stereoselective oxidation of differently functionalised benzyl phenylsulfides has been examined by using enantiopure TiIV trialkanolamine complexes. These complexes efficiently catalyse the sulfoxidation with good stereoselectivities. The data highlight the contribution to the stereoselectivity of steric effects and non‐covalent π–π interactions between the aromatic rings of the TiIV complex and
Unusual Application for Phosphonium Salts and Phosphoranes: Synthesis of Chalcogenides
作者:Igor M. R. Moura、Arisson Tranquilino、Barbara G. Sátiro、Ricardo O. Silva、Diogo de Oliveira-Silva、Roberta A. Oliveira、Paulo H. Menezes
DOI:10.1021/acs.joc.1c00114
日期:2021.4.16
A novel strategy for the synthesis of sulfides and selenides from phosphonium salts and thio- or selenesulfonates, commercially available compounds, is described. When phosphoranes were used in the reaction, different products were obtained. The methodology does not require the use of metals, reactive species, or anhydrous conditions to be performed.