Tetramethylguanidinium triflate: An efficient catalyst solvent for the convergent synthesis of fused spiro[1,4-dihydropyridine-oxindole] compounds
作者:Kurosh Rad-Moghadam、Leila Youseftabar-Miri
DOI:10.1016/j.jfluchem.2011.11.007
日期:2012.3
Synthesis of spiro[1H-indeno[1,2-b]benzoquinolin-13,3′-indoline]-7,13-dihydro-12,2′-dione derivatives was achieved expediently through three-component reactions between 2H-indene-1,3-dione, 1- or 2-naphthalenamine, and isatin derivatives under catalysis of the ionic liquid N,N,N,N-tetramethylguanidinium triflate. The ionic liquid appeared as a task-specific catalyst solvent being amenable to successive
螺[1H-茚并[1,2-b]苯并喹啉-13,3'-二氢吲哚] -7,13-二氢-12,2'-二酮衍生物的合成可通过2H-茚-之间的三组分反应方便地实现离子液体N,N,N,N催化下的1,3-二酮,1-或2-萘胺和靛红衍生物-三氟甲磺酸四甲基胍盐。离子液体表现为任务特定的催化剂溶剂,适合连续循环使用,而活性没有明显下降。当使用-1,2-二酮或1H-茚-1,2,3-三酮代替靛红时,以及当使用2-氨基尿嘧啶代替萘胺来提供与结构相关的螺环产物时,该合成方法同样适用。对于反应,提出了一种收敛机制,以解释与所用组分相对应的螺化合物的选择性形成。