- [bmim]OH promoted hydroalkynylation of nitrile and intramolecular hydroamination of the carbon-carbon multiple bond: An efficient and eco-compatible strategy for the synthesis of indolizinones
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An efficient and novel hydroalkynylation of 2-cyanopyridine with arylacetylene and a subsequent intramolecular hydroamination promoted by a basic ionic-liquid, [bmim]OH, under microwave activation in the absence of an organic solvent and an inorganic base, yielding biodynamic indolizinones has been developed. The protocol involves [bmim]OH mediated in situ generation and addition of a nucleophilic alkynide from the aryl substituted terminal on a carbon alkyne of a polar nitrile group of 2-cyanopyridine. This results in the formation of a 2-pyridylphenylethynyl methimine intermediate which, on subsquent intramolecular nucleophilic addition of a pyridyl nitrogen on the carbon-carbon triple bond of the imine intermediate, heterocyclized into indolizinone with high atom economy. The reaction proceeded smoothly and quantitatively at an ambient temperature. The task specific [bmim]OH was recovered and reused three times without any appreciable decrease in its activity and product yield. The Royal Society of Chemistry 2013.
- Siddiqui,Abumhdi, Afaf A. H.,Shamim, Shayna,Shireen,Waseem, Malik A.,Rahila,Srivastava, Arjita,Srivastava, Anjali
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p. 10173 - 10176
(2013/09/02)
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