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An efficient and eco-friendly synthesis of 2-pyridones and functionalized azaxanthone frameworks via indium triflate catalyzed domino reaction

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Abstract

A green and efficient one-pot method has been developed for the synthesis of 2-pyridone and functionalized azaxanthone frameworks using indium triflate as an environmentally friendly, reusable catalyst. In this one-pot reaction, 3-formylchromones display a diverse pattern of reactivity upon reaction with different classes of alkenes. An indium triflate-promoted reaction with (Z)-N-methyl-1-(methylthio)-2-nitroethenamine leads to 3-formylchromone annulations to 2-pyridone and analogues via a remarkably facile chromone ring opening. The analogous reaction with N,N’-dimethyl-2-nitro-ethene-1,1-diamine results in the formation of synthetically useful functionalized azaxanthones via a 6π-electrocyclization reaction.

Graphical abstract: An efficient and eco-friendly synthesis of 2-pyridones and functionalized azaxanthone frameworks via indium triflate catalyzed domino reaction

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Publication details

The article was received on 13 Dec 2016, accepted on 30 Mar 2017 and first published on 03 Apr 2017


Article type: Communication
DOI: 10.1039/C6GC03440C
Citation: Green Chem., 2017, Advance Article
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    An efficient and eco-friendly synthesis of 2-pyridones and functionalized azaxanthone frameworks via indium triflate catalyzed domino reaction

    N. Poomathi, P. T. Perumal and S. Ramakrishna, Green Chem., 2017, Advance Article , DOI: 10.1039/C6GC03440C

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