Abstract
A catalytic reaction between terminal alkynes, acetylenic esters, and oxiranes has been described. This domino transformation serves as a useful sequential and one-pot method for the synthesis of 2H-pyran-4-carboxylate skeletons from the readily available starting materials. In situ-generated copper acetylides treated initially with oxiranes in the presence of copper catalysts and tetrabutylphosphonium salts, followed by addition of propiolates after 60 min to form synthetically important heterocycles.
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We wish to thank for a grant from Islamic Azad University, South Tehran Branch.
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Jahanshad, M., Manafi, M., Mousavi-Safavi, S.M. et al. A copper-catalyzed reaction between terminal alkynes, acetylenic esters, and oxiranes: efficient synthesis of 2H-pyran-4-carboxylate. Monatsh Chem 151, 113–122 (2020). https://doi.org/10.1007/s00706-019-02526-z
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DOI: https://doi.org/10.1007/s00706-019-02526-z