An efficient and facile method has been developed for the synthesis of various 6,6a-dihydroisoindolo[2,1-a]quinazoline-5,11-dione derivatives, via a three-component reaction of 2-amino-N-(R)-benzamide derivatives with 2-formylbenzoic acid using sulfonic acid functionalized nanoporous silica as an efficient catalyst in ethanol under reflux. High yield of the desired products, reusability of the catalyst, and effortless workup step without using chromatography are the advantages of this method.

Graphic abstract

中文翻译：

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官能化纳米多孔二氧化硅催化高效合成6,6 a-二氢异吲哚并[2,1- a]喹唑啉-5,11-二酮衍生物

有效和容易的方法已被开发用于合成各种6,6-一个-dihydroisoindolo [2,1-一个]喹唑啉-5,11-二酮衍生物，通过2-氨基-三组分反应ñ - （R磺酸官能化的纳米多孔二氧化硅作为乙醇中回流的有效催化剂，用2-甲酰基苯甲酸生成）-苯甲酰胺衍生物。该方法的优点是所需产物的高收率，催化剂的可重复使用性以及不使用色谱法的轻松后处理步骤。

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