A facile, one-pot, pseudo four-component catalyst- and solvent-free synthesis of novel benzopyrano[2,3-b]pyridines is achieved by Michael addition of various naphthols to iminocoumarin derivatives obtained from Knoevenagel condensation of salicylaldehydes with malononitrile, which can be attacked by another molecule of malononitrile to afford the title products. The advantages of this procedure are mild reaction conditions, high yields of products, generality, short reaction times and operational simplicity. (C) 2013 Published by Elsevier Ltd.
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Islamic Azad Univ, Dept Chem, Khoy Branch, Khoy, IranIslamic Azad Univ, Dept Chem, Khoy Branch, Khoy, Iran
Aminkhani, Ali
Sharifi, Sina
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Harvard Med Sch, Massachusetts Eye & Ear, Dept Ophthalmol, Boston, MA 02115 USA
Harvard Med Sch, Schepens Eye Res Inst, Boston, MA 02115 USAIslamic Azad Univ, Dept Chem, Khoy Branch, Khoy, Iran