Facile, high-yielding preparation of pyrrolidinium, piperidinium, morpholinium and 2,3-dihydro-1H-isoindolinium salts and ionic liquids from secondary amines
作者:Antony J. Ward、Anthony F. Masters、Thomas Maschmeyer
DOI:10.1039/c4ra03226h
日期:——
High yield and purity heterocyclic ionic liquids can be obtained via the microwave irradiation of equimolar amounts of a secondary amine and of an α,ω-dibromoalkane (i.e., 1,4-dibromobutane, 1,5-dibromopentane, bis(2-bromoethyl)ether, or α,α′-dibromo-o-xylene) in water, in the presence of potassium carbonate, followed by anion exchange with lithium bis(trifluoromethanesulfonyl)imide, affording pyrrolidinum
通过微波辐射等摩尔量的仲胺和α,ω-二溴烷烃(即1,4-二溴丁烷,1,5-二溴戊烷,双(2-溴乙基))可以得到高收率和纯度的杂环离子液体碳酸钾存在下,在水中加入乙醚或α,α'-二溴-邻二甲苯),然后与双(三氟甲磺酰基)酰亚胺锂进行阴离子交换,分别得到吡咯烷鎓,哌啶鎓和吗啉鎓离子液体。使用这种方法,可以从少量易得且相对便宜的原料中制备大量同源离子液体,包括基于2,3-二氢-1 H的新型离子液体。-异吲哚鎓环系统。对这种合成方法的分析(使用SWOT和GSK“绿色”评估)以及与当前文献准备工作的比较表明,该新方法在一系列相关参数方面具有显着优势。