Palladium-catalyzed annulation presents a new approach for synthesizing indanones from readily available N-acyl saccharins and bicyclic alkenes with high yields. This reaction proceeds via cleavage of the C-H, C-C, and C-N bonds of the acyl saccharin and the rearrangement of the carbonyl moiety by decarbonylation and CO reinsertion. This transformation introduces an innovative bond disconnection strategy for annulation reactions via CO shuttling. Additionally, it can also be applied in the synthesis of the CDC7 inhibitor and ferrocene indanone.

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