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An electrochemical synthesis of oxazol-2-ones and imidazol-2-ones has been developed via 5-exo-dig cyclization of propargylic carbamates-and ureas-derived amidyl radicals.The electrosynthesis relies on the dual function of 2,2,6,6-tetramethylpiperidin-1-yl)oxyl (TEMPO) as a redox mediator for amidyl radical formation and an oxygen atom donor.The reactions are conducted under mild conditions using a simple setup and provide convenient access to functionalized oxazol-2-ones and imidazol-2-ones from readily available materials.