A concise and efficient synthetic approach was developed for the synthesis of functionalized 2,3-disubstituted 1,6-dihydropyrrolo[2,3-g]indazole via a one-pot, three-component reaction of 1H-indazol-6-amine, arylglyoxal monohydrates, and 4-hydroxy-2H-chromen-2-one or 4-hydroxyquinolin-2(1H)-one promoted by acetic acid in ethanol under reflux conditions. The attractive features of this protocol are operational simplicity, short reaction time, easy purification of products, and good to excellent yields.

中文翻译：

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一锅法三组分反应合成新型2, 3-二取代1,6-二氢吡咯并[2,3-g]吲唑衍生物

开发了一种简洁高效的合成方法，通过 1H-吲唑-6-胺的一锅三组分反应合成功能化 2,3-二取代 1,6-二氢吡咯并 [2,3-g] 吲唑， arylglyoxal monohydrates，和 4-hydroxy-2H-chromen-2-one 或 4-hydroxyquinolin-2(1H)-one 在回流条件下由乙醇中的乙酸促进。该协议的吸引人的特点是操作简单、反应时间短、产品易于纯化以及收率良好。