A solvent-free synthesis of coumarins using 1,3-disulfonic acid imidazolium hydrogen sulfate as a reusable and effective ionic liquid catalyst
作者:Farhad Shirini、Asieh Yahyazadeh、Kamal Mohammadi
DOI:10.1007/s11164-014-1733-3
日期:2015.9
1,3-Disulfonic acid imidazolium hydrogen sulfate has been used as an effective and reusable ionic liquid catalyst for the synthesis of coumarins from phenol derivatives with β-ketoesters via the Von Pechmann condensation under solvent-free conditions. This method consistently has the advantages of excellent yields, easy and quick isolation of the products, short reaction times, and green aspects by avoiding toxic catalysts and solvents. Further, the catalyst can be recovered and reused for four times without loss of activity.
1,3-二磺酸咪唑鎓氢硫酸盐被用作一种有效且可重复使用的离子液体催化剂,用于在无溶剂条件下通过Von Pechmann缩合反应合成来自酚衍生物的香豆素与β-酮酯。该方法始终具有优秀的产率、产品易于迅速分离、反应时间短以及通过避免有毒催化剂和溶剂体现的绿色特性。此外,催化剂可以回收并重复使用四次而不损失活性。