Transition-Metal-Free and Photocatalyst-Free Sulfenylation of Halopyrazolamines under Visible-Light Irradiation via Electron Donor–Acceptor Complexes
作者:Subburethinam Ramesh、Markabandhu Shanthi、Karuppaiah Perumal、Soumya Sivalingam、Arulmozhi Puhazhendhi、Pavan Kumar Mandali
DOI:10.1055/a-2136-3700
日期:2024.2
complex through a halogen bond or π–π interaction based on various halogenated pyrazolamines, depending on the HOMO–LUMO energy gap of the C–X bond. The reaction of halogenated pyrazol-5-amines with thiophenol derivatives proceeded in good to excellent yields. The formation of a π–π complex or halogen bonding between the halopyrazolamine and the thiolate anion was confirmed by UV/visible spectroscopy.
开发了一种在无金属条件下在蓝色 LED 照射下卤代吡唑-5-胺硫醇化的新方法。这种高效实用的方法能够产生具有药用意义的硫醇化吡唑-5-胺结构单元。这种简单的技术允许电子供体-受体通过两个不同的过程进行光化学硫醇化;基于各种卤代吡唑胺,通过卤素键或 π-π 相互作用形成电荷转移络合物,具体取决于 C-X 键的 HOMO-LUMO 能隙。卤代吡唑-5-胺与苯硫酚衍生物的反应以良好至优异的收率进行。通过紫外/可见光谱证实了卤代吡唑胺和硫醇盐阴离子之间形成了 π-π 络合物或卤素键。