Abstract
α-Oxo gold carbenes generated in situ via the gold-catalyzed selective oxidation of 4-oxahepta-1,6-diynes were effectively trapped by internal alkynes, resulting in the formation of 2H-pyran-3(6H)-ones, , and chromen-3(4H)-ones, , upon facile trapping the vinyl cation intermediates by an external N-oxide and internal aryl ring system.
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