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A Cu‐catalyzed aerobic oxidative coupling of acetophenones with indoles has been developed, and is an efficient and practical C−H (sp 3 ) functionalization approach to C‐3 dicarbonyl indoles, using O 2 as the green oxidant. Moreover, a series of dicarbonyl indoles have been obtained smoothly and the plausible mechanism is proposed based on control experiments.
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Guo et al. (2017) studied this question.
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