A new natural based ionic liquid 3-sulfonic acid 1-imidazolopyridinium hydrogen sulfate as an efficient catalyst for the preparation of 2H-indazolo[2,1-b]phthalazine-1,6,11(13H)-triones
作者:Reza Tayebee、Malihe Jomei、Behrooz Maleki、Maryam Kargar Razi、Hojat Veisi、Mohammad Bakherad
DOI:10.1016/j.molliq.2015.02.021
日期:2015.6
A novel Brønsted acidic ionic liquid 3-sulfonic acid 1-imidazolopyridinium hydrogen sulfate [Simp]HSO4 was synthesized via the reaction of caffeine with chlorosulfonic acid and was characterized by studying FT-IR, 1H NMR, 13C NMR, UV–Vis, and fluorescence spectra. Then, the prepared ionic liquid was utilized as an efficient catalyst for the preparation of 2H-indazolo[2,1-b]phthalazine-1,6,11(13H)-trione
通过咖啡因与氯磺酸的反应合成了一种新型的布朗斯台德酸性离子液体3-磺酸1-咪唑并吡啶鎓硫酸氢盐[Simp] HSO 4,并通过FT-IR,1 H NMR,13 C NMR,UV-Vis进行了表征和荧光光谱。然后,将制备的离子液体用作通过一锅多醛缩合制备2H-吲唑并[2,1-b]酞嗪-1,6,11(13H)-三酮衍生物的有效催化剂。 ,邻苯二甲酰肼和二甲酮在无溶剂的条件下使用。该催化剂的高布朗斯台德酸性功能主要源自SO 3 H基团的双重氢键结合能力。