Environmentally benign synthesis of 4-aminoquinoline-2-ones using recyclable choline hydroxide

Abstract

Greener synthesis of 4-aminoquinoline-2-ones was achieved by intramolecular cyclization of 2-cyanophenylamide derivatives using biodegradable and recyclable choline hydroxide (ChOH). The reaction proceeds rapidly and affords the corresponding 4-aminoquinoline-2-ones with a good to excellent yield. The protocol has the advantage of easy workup, high yields, and an environmentally benign methodology compared to other reported methods. The simplicity of this method makes it an interesting alternative to other approaches.