A simple and efficient one-pot synthesis of novel polyheterocyclic benzimidazo[1,2-a]- chromeno[4,3-d]pyrimidinones 4 via a three-component condensation of 2-aminobenzimidazole 1, aromatic aldehydes 2 and 4-hydroxy coumarin 3 catalyzed by Bronsted acid ionic liquid triethyl ammonium hydrogen sulphate [Et₃NH][HSO₄] under solvent-free conditions is reported. The main advantages of this protocol are short reaction time, easy work-up, operational simplicity, and excellent yields with high purity, without intervention of chromatography.

中文翻译：

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[Et3NH] [HSO4]催化简单高效地一锅合成新型苯并咪唑并[1,2-a]-铬[4,3-d]嘧啶酮

新颖多杂环苯并咪唑的简单和有效的一锅合成[1,2一] -色烯并[4,3- d ]嘧啶酮4 经由2-氨基苯并咪唑的三组分缩合1，芳香醛2和4-羟基香豆素3由布朗斯台德酸的离子液体氢三乙基铵硫酸盐[催化的Et ₃ NH] [HSO ₄ ]被报告无溶剂的条件下进行。该方案的主要优点是反应时间短，后处理容易，操作简便以及高纯度，无需色谱法即可获得高收率。