碱性离子液体1-丁基-3-甲基咪唑鎓氢氧化物([bmim] OH)可有效促进芳香醛,丙二腈或氰基乙酸乙酯与2-羟基-1,4-羟基的一锅三组分缩合。萘醌在室温下以高收率生产4-芳基-5,10-二氢-4 H-苯并[ g ]亚甲基5,10-二酮衍生物。该反应不涉及任何有害的有机溶剂和有毒的催化剂。离子液体被回收并再循环用于随后的反应。此外,与已报道的方法相比,该方案具有易于操作,反应时间短,收率高和对环境有益的优点。J.杂环化学。(2011)。
Potassium phthalimide-N-oxyl: a novel, efficient, and simple organocatalyst for the one-pot three-component synthesis of various 2-amino-4H-chromene derivatives in water
作者:Mohammad G. Dekamin、Mohammad Eslami、Ali Maleki
DOI:10.1016/j.tet.2012.11.068
日期:2013.1
A wide variety of 2-amino-4H-chromene derivatives with diverse substituents on the 4H-chromene ring were efficiently prepared via one-pot, three-component reaction of an aromatic aldehyde, malononitrile (or ethyl cyanoacetate), and diverse enolizable C-H activated acidic compounds in the presence of low loading of potassium phthalimide-N-oxyl (POPINO), as a new organocatalyst, in aqueous media. This procedure is a clean, transition metal-free, and environmentally friendly approach to prepare different 2-amino-4H-chromen derivatives that offers many advantages including short reaction time, high to quantitative yields, low cost, and straightforward work-up. (C) 2012 Elsevier Ltd. All rights reserved.