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Gold-catalyzed Selective Oxidation Of 4-oxahepta-1,6-diynes To 2H-pyran-3(6H)-ones And Chromen-3(4H)-ones Via β-gold Vinyl Cation Intermediates

Kegong Ji, Xiang Liu, Bowen Du, Fang Yang, Jinming Gao

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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, 3, and chromen-3(4H)-ones, 4, upon facile trapping the vinyl cation intermediates.