Abstract
In this research, Brønsted-acidic ionic liquids N,N,N′,N′-tetramethylethylene-diaminium-N,N′-disulfonic acid trifluoroacetate ([TMEDSA][TFA]2) and pyridinium-N-sulfonic acid hydrogen sulfate ([Py-SO3H][HSO4]) have been introduced as dual-functional catalysts for the green, simple and effective preparation of N,N′-alkylidene bisamides by the reaction of primary amides (2 eq.) with arylaldehydes (1 eq.) under solvent-free conditions. The reaction results and conditions of the catalysts have been compared with the previously reported ones. [TMEDSA][TFA]2 and [Py-SO3H][HSO4] were superior to the previously reported catalysts in terms of two or more of these factors: reaction times (10–45 min), yields (86–98%), temperature and the reaction conditions. Additionally, a plausible and attractive mechanism based on dual functionality of the catalysts has been proposed.
在这项研究中,Brønsted酸性离子液体N,N,N′,N′-四甲基乙二胺-N,N′-二磺酸三氟乙酸酯([TMEDSA][TFA]2)和吡啶-N-磺酸氢硫酸盐([Py-SO3H][HSO4])被引入作为双功能催化剂,用于在无溶剂条件下通过一次酰胺(2当量)与芳基醛(1当量)的反应绿色、简单和有效地制备N,N′-烷基亚胺。与先前报道的催化剂相比,这些催化剂的反应结果和条件进行了比较。[TMEDSA][TFA]2和[Py-SO3H][HSO4]在反应时间(10-45分钟)、产率(86-98%)、温度和反应条件等两个或更多因素方面优于先前报道的催化剂。此外,提出了基于催化剂双重功能性的可能且有吸引力的机制。