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Total Synthesis of the Cyclopeptide Alkaloid Abyssenine A.Application of Inter- and Intramolecular Copper-Mediated CouplingReactions in Organic Synthesis
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The first total synthesis of the 15-membered ring cyclopeptide alkaloid abyssenine A 1 has been achievedwith a longest linear sequence of 15 steps. Central to the synthetic approach was an efficient copper-mediated Ullmann coupling/Claisen rearrangement sequence allowing for both ipso and ortho functionalization of aromatic iodide 4. This sequence was used for the synthesis of the aromatic core. The syntheticutility of copper-catalyzed coupling reactions was further demonstrated to install the enamide with aconcomitant straightforward macrocyclization starting from acyclic α-amido-ω-vinyl iodide 13.
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