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Dioxygen activation under ambient conditions: Cu-catalyzed oxidative amidation-diketonization of terminal alkynes leading to alpha-ketoamides.

A novel Cu-catalyzed oxidative amidation-diketonization reaction of terminal alkynes leading to alpha-ketoamides has been developed. This chemistry offers a valuable mechanistic insight into this novel Cu catalysis via a radical process. O(2) not only participates as the ideal oxidant but also undergoes dioxygen activation under ambient conditions in this transformation.