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A total synthesis of the marine natural productdiazonamide A (1) has been accomplished. This work features a highly stereoselective synthesis of the C(10) quaternary center and the central furanoindoline core enabled by an iminium-catalyzed alkylation–cyclization cascade. Additionally, a magnesium-mediated intramolecular macroaldolization and a palladium-catalyzed tandem borylation/annulation were developed to enable the closure of the two 12-membered macrocycles of diazonamide A. This synthesis involves 20 steps in its longest linear sequence and proceeds in 1.8% overall yield.
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