Herein, we report our new results regarding a palladium-catalyzed [2+2+1] oxidative annulation of 4-hydroxycoumarins with unactivated internal alkynes, which affords a new class of compounds: the spiro cyclopentadiene-chroman-2,4diones.
Cu-catalyzed oxidative amidation of benzyl cyanide for primary amides is successfully developed. Using readily available NH4Cl and Cu/O2 catalytic oxidation system offers new opportunities for C–CN bond cleavage and primary amides bond formation.
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