Functionalised ionic liquids: synthesis of ionic liquids with tethered basic groups and their use in Heck and Knoevenagel reactions
作者:Stewart A. Forsyth、Ute Fröhlich、Peter Goodrich、H. Q. Nimal Gunaratne、Christopher Hardacre、Angela McKeown、Kenneth R. Seddon
DOI:10.1039/b9nj00729f
日期:——
A simple and efficient synthesis of a novel series of ionic liquids bearing nucleophilic (Me2N) and non-nucleophilic base (iPr2N) functionalities is described. The non-nucleophilic base functionality resembles the structure of the Hünig's base (N,N-diisopropylethylamine), which has been used widely in organic synthesis. A qualitative measure of the basicity of these ionic liquids is presented by utilising their interaction with universal indicator. The basicity of these ionic liquids was found to be dependent on the amine tether and choice of linker between the two nitrogen centres. The relative base strength of these ionic liquids was also probed by using them as catalysts in the Heck and Knoevenagel reactions.
本文描述了一种简单高效的合成新型离子液体系列的方法,这些离子液体具有亲核性(Me2N)和非亲核性碱(iPr2N)功能。非亲核性碱功能类似于Hünig碱(N,N-二异丙基乙胺)的结构,后者在有机合成中得到了广泛应用。利用这些离子液体与通用指示剂的相互作用,提供了它们碱性的定性测量。这些离子液体的碱性发现依赖于氨基链和两个氮中心之间连接基团的选择。通过在Heck和Knoevenagel反应中作为催化剂使用,也探究了这些离子液体的相对碱强度。