Abstract
The reaction of aromatic aldehydes, dimedone, and malononitrile in the presence of ammonium acetate has afforded tetrahydrobenzo[b]pyrans instead of polyhydroquinolines under both grinding and reflux conditions; thus ammonium acetate acts as a catalyst for this transformation instead of a reactant. Polyhydroquinoline derivatives were also synthesized via a one-pot condensation of aromatic aldehydes, malononitrile and an enaminone, which was prepared by the reaction of dimedone and ammonium acetate, in refluxing ethanol in high yields.
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The authors sincerely acknowledge the Research Office of Azarbaijan Shahid Madani University for financial support.
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Moshtaghi Zonouz, A., Okhravi, S. & Moghani, D. Ammonium acetate as a catalyst and/or reactant in the reaction of dimedone, aromatic aldehyde, and malononitrile: synthesis of tetrahydrobenzo[b]pyrans and hexahydroquinolines. Monatsh Chem 147, 1819–1824 (2016). https://doi.org/10.1007/s00706-016-1683-0
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DOI: https://doi.org/10.1007/s00706-016-1683-0