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An efficient one-pot synthesis of 2-substituted quinoxalines from 1,2-diamines and phenacyl bromides is developed using K10-montmorillonite (K10 clay) as a catalyst at 50°C in acetonitrile medium. This method offers an easy route for the synthesis of substituted quinoxalines in high yields. A plausible mechanism is proposed in which quinoxalines are formed via dehydration–dehydrohalogenation–cyclization...
A series of imidazopyridine derivatives have been synthesized efficiently via intramolecular cyclization in excellent yields using Al 3+ -exchanged on K10 montmorillonite clay (Al 3+ -K10 clay) as a reusable heterogeneous catalyst. To the best of our knowledge, this is the first report to utilize Al 3+ -K10 as a catalyst for imidazopyridine synthesis. Many functional groups...
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