efficient method is a green and practical way for the preparation of the thioethers, for it tolerates a wide range of substrates such as aryl and alkyl thiols, as well as benzylic, allylic, secondary, tertiary, and even the less reactive aliphatic alcohols.
Investigation of steric and electronic effects in the copper-catalysed asymmetric oxidation of sulfides
作者:Graham E. O'Mahony、Kevin S. Eccles、Robin E. Morrison、Alan Ford、Simon E. Lawrence、Anita R. Maguire
DOI:10.1016/j.tet.2013.08.063
日期:2013.11
in the copper-catalysed asymmetricoxidation of aryl benzyl, aryl alkyl and alkyl benzyl sulfides have been investigated. The presence of an aryl group directly attached to the sulfur is essential to afford sulfoxides with high enantioselectivities, with up to 97% ee for 2-naphthyl benzyl sulfoxide, the highest enantioselectivity achieved to date for copper-catalysed asymmetric sulfoxidation. In contrast
We report here an efficient, mild and biomolecule-compatible method for constructing C–S bonds.
我们在这里报告了一种高效、温和且生物分子兼容的构建C-S键的方法。
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。