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Communication | Regular issue | Vol 78, No. 4, 2009, pp.905-909
Published online, 19th December, 2008
DOI: 10.3987/COM-08-11588
Silica Gel Catalyzed Synthesis of Quinoxaline 1,4-Dioxides under Solvent-Free Conditions Using Microwave Irradiation

Yusuke Sumiyoshi, Hiroaki Saito, Shinichi Miyairi, and Tohru Takabatake*

*College of Pharmacy, Nihon University, 7-7-1 Narashinodai, Funabashi-shi, Chiba 274-8555, Japan

Abstract

We report on the simple and quick synthesis of quinoxaline 1,4-dioxides in solvent-free conditions under microwave irradiation. Heating of various benzofuroxans and β-ketoesters or 1,3-diketones adsorbed on silica gel in a microwave oven for two minutes affords diverse biologically attractive quinoxaline 1,4-dioxides in high to excellent yields. Silica gel functions not only as support using microwave but also as catalyst and dehydration reagent.