One-Pot, Three-Component Synthesis of Pyrimido[4,5-b]quinoline-tetraone Derivatives in Water

Abstract Novel pyrimido[4,5-b]quinoline-tetraones were prepared by the three-component reaction of 2-hydroxynaphthalene-1,4-dione, 6-amino-uracils, and aromatic aldehydes in aqueous media and catalyzed by p-toluenesulfonic acid. This protocol provides a simple one-step procedure with the advantages of easy workup, good yield of products, and environmental friendliness. GRAPHICAL ABSTRACT

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