Sulfur–silicon bond activation catalysed by Cl/Br ions: waste-free synthesis of unsymmetrical thioethers by replacing fluoride catalysis and fluorinated substrates in SNAr reactions
作者:Xiaojuan Jia、Lei Yu、Jianping Liu、Qing Xu、Marcel Sickert、Lianhui Chen、Mark Lautens
DOI:10.1039/c4gc00535j
日期:——
In contrast to conventional activation of NuâSiR3 reagents by F ion attributed to the strong affinity of Si to F, SâSi activation can now be achieved using Cl/Br ions of TBAX as catalysts via formation of weaker XâSi bonds and Me3SiâX. This led to a waste-free synthesis of unsymmetrical thioethers via F-free SNAr reactions of activated (hetero)aryl halides and RSâSiMe3, with recovery of the useful Me3SiâX reagent in high yields.
与传统通过氟离子激活Nu–SiR3试剂(归因于硅对氟的强亲和力)相比,S–Si激活现在可以通过TBAX的氯/溴离子作为催化剂实现,这通过形成较弱的X–Si键和Me3Si–X。这样可以实现无废物合成不对称的硫醚,通过活化的(杂)芳基卤化物和RS–SiMe3进行无氟的SNAr反应,并高产率回收有用的Me3Si–X试剂。