Protic ionic liquids as recyclable solvents for the acid catalysed synthesis of diphenylmethyl thioethers
作者:Luke C. Henderson、Megan T. Thornton、Nolene Byrne、Bronwyn L. Fox、Kelsey D. Waugh、Jennifer S. Squire、Linden Servinis、Joshua P. Delaney、Hannah L. Brozinski、Luke M. Andrighetto、Jarrad M. Altimari
DOI:10.1016/j.crci.2013.04.002
日期:2013.7
Résumé The acid catalysed formation of diphenylmethyl (DPM) thioethers was successfully achieved using the protic ionic liquid (pIL) triethylamine:methanesulfonic acid (TeaMs) as the reaction solvent under microwave irradiation. A slight excess of methanesulfonic acid (10% v/v) was required to facilitate the reaction, which was applied to a variety of thiols. Aliphatic, aromatic and heterocyclic aromatic thiols were converted to their corresponding DPM thioethers in high yields (63–99%), in short reaction times (5–20 min) and using mild temperatures (80–100 °C). Finally, the pIL (TeaMS) was recycled five times without loss of yield.
摘要 在微波辐照下,以三乙胺:甲基磺酸(TeaMs)原生离子液体(pIL)为反应溶剂,成功地实现了酸催化生成二苯基甲基(DPM)硫醚。为促进反应的进行,需要略微过量的甲磺酸(10% v/v),该反应适用于多种硫醇。脂肪族、芳香族和杂环芳香族硫醇在较短的反应时间(5-20 分钟)和温和的温度(80-100 °C)下被转化为相应的 DPM 硫醚,产率高(63-99%)。最后,pIL(TeaMS)被循环使用了五次,产率未受损失。