One-Pot Four-Component Synthesis of 5,10-Diarylpyrido[4,3-b][1,6] Naphthyridine Derivatives in Ionic Liquids Catalyzed by TsOH

ABSTRACT

A one-pot four-component reaction of aldehyde, aromatic amine, and two equivalents of piperidine-2,4-dione was treated in ionic liquids of [BMIm]Br catalyzed by TsOH (p-toluenesulfonic acid), and gave a series of 5,10-diarylpyrido[4,3-b][1,6]naphthyridine derivatives in good yields. This procedure has the advantages of mild reaction conditions, good yields, one-pot, and environmentally benign.

KEYWORDS:

• Four-component reaction
• ionic liquids
• pyridonaphthyridine
• TsOH

Funding

We are grateful to the Major Natural Science Foundation of Jiangsu Province (14KJA150004), and the Priority Academic Program Development of Jiangsu Higher Education Institutions for financial support.