Organocatalytic approach toward the green one-pot synthesis of novel benzo[f]chromenes and 12H-benzo[5,6]chromeno[2,3-b]pyridines |
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Authors: | Abolfazl Olyaei Mohammad Sadegh Shahsavari Mahdieh Sadeghpour |
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Affiliation: | 1.Department of Chemistry,Payame Noor University,Tehran,Iran;2.Department of Chemistry, Takestan Branch, Islamic Azad University,Takestan,Iran |
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Abstract: | An efficient tandem reaction approach is described to prepare novel benzo[f]chromenes from 2,3-dihydroxynaphthalene, malononitrile and aldehydes using 10 mol% guanidine hydrochloride as the catalyst under solvent-free conditions. The method was also extended to the preparation of novel 12H-benzo[5,6]chromeno[2,3-b]pyridines from 2-aminoprop-1-ene-1,1,3-tricarbonitrile instead of malononitrile under the same reaction conditions. The described one-pot three-component reaction is characterized by short reaction times, high-product yield, mild reaction conditions, simple workup procedure, and simple purification. |
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