Abstract

A six-membered cyclic vinylpalladium complex was synthesized via alkenyl C–H bond direct palladation, which was probed in detail by 1H NMR spectroscopy and characterized by X-ray analysis. The cyclic vinylpalladium complex was propounded to be the intermediate during the olefination reaction of enamides. An efficient catalytic system for oxidative cross-coupling reaction of enamides with electron-deficient olefins catalyzed by palladium(II) acetate and 1 atm oxygen as sole oxidant was developed. The corresponding products were obtained in moderate to good yields under mild conditions.

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