Assembly of (hetero)aryl thioethers <i>via</i> simple nucleophilic aromatic substitution and Cu-catalyzed coupling reactions with (hetero)aryl chlorides and bromides under mild conditions
作者:Weiqi Liu、Xinghao Jin、Dawei Ma
DOI:10.1039/d3gc02066e
日期:——
requirement of higher reaction temperatures for an SNAr reaction between thiols and less reactive electron-poor aryl halides described in earlier reports has triggered intensive studies on the development of metal- and photo-catalyzed methods to promote this transformation. We report here that an SNAr reaction of thiols with most electron-poor aryl halides takes place at RT–60 °C under the action of
早期报道中描述的硫醇和反应性较低的缺电子芳基卤化物之间的S N Ar 反应需要更高的反应温度,这引发了对开发金属和光催化方法以促进这种转变的深入研究。我们在此报告,在 K 2 CO 3和 DMAc的作用下,硫醇与大多数缺电子芳基卤化物在 RT–60 °C 下发生S N Ar 反应。在这种温和的条件下,碱和溶剂都起着至关重要的作用。对于对 S N不发生反应的(杂)芳基卤化物Ar反应中,鉴定出两种更强大的草酸二酰胺配体,使其Cu催化的偶联反应能够在低催化负载量下进行。这两种方法的结合为制备(杂)芳基硫醚提供了一种非常有吸引力的方法。
Simple N-Heterocyclic Carbenes as Ligands in Ullmann-Type Ether and Thioether Formations
作者:Jiang-Ping Wu、Anjan K. Saha、Nizar Haddad、Carl A. Busacca、Jon C. Lorenz、Heewon Lee、Chris H. Senanayake
DOI:10.1002/adsc.201600316
日期:2016.6.16
A simple N‐heterocyclic carbene (NHC) derived from 1‐methyl‐3‐ethylimidazolium tetrafluoroborate was found to be an efficient ligand for a range of copper‐catalyzed cross‐coupling reactions, leading to the formation of aromatic ethers and thioethers.