A two-step procedure was proposed for the synthesis of 2-aryl- and 2,4-diaryl-substituted 4H-chromenes by the formal [4+1] cycloaddition reaction of o-quinone methides and pyridinium ylides followed by reductive rearrangement of 2-aroyl-2,3-dihydrobenzofurans by the action of zinc in acetic acid or samarium and trimethylchlorosilane in 1,4-dioxane. The reduction of 3-unsubstituted 2-aroyl-2,3-dihydrobenzofurans by the action of zinc in acetic acid leads mainly to 2-hydroxydihydrochalcones.
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The study was carried out with the financial support of the Russian Foundation for Basic Research within the framework of the scientific project No. 19-03-01024 using the scientific equipment of the Center for Collective Use "“Investigation of the physico-chemical properties of substances and materials" of the Samara State Technical University.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, 2021, 57(12), 1170–1175
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Osipov, D.V., Demidov, M.R., Osyanin, V.А. et al. Reductive rearrangement of 2-aroyl-2,3-dihydrobenzofurans into 2-hydroxydihydrochalcones and flav-2-enes. Chem Heterocycl Comp 57, 1170–1175 (2021). https://doi.org/10.1007/s10593-021-03039-6
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DOI: https://doi.org/10.1007/s10593-021-03039-6