New One-Pot Synthesis of Polysubstituted Benzofurans and Benzo-1,4-dioxines |
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| Authors: | G N Sakhabutdinova G Z Raskil’dina S S Zlotskii R M Sultanova |
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| Institution: | 1.Ufa State Petroleum Technological University,Ufa, Bashkortostan,Russia;2.Ufa Institute of Chemistry,Russian Academy of Sciences,Ufa, Bashkortostan,Russia |
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| Abstract: | It has been revealed that the copper(II) triflate catalyzed reaction of ethyl-2-diazo-3-oxobutanoate with phenols followed by cyclization of the intermediate enol in the presence of polyphosphoric acid is a simple and efficient method of synthesis of polysubstituted benzofurans. The use of pyrocatechol leads to the corresponding substituted 1,4-benzodioxine-2-carboxylates as major products. |
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