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Enantioselective Synthesis of the Platensimycin Core by Silver(I)-Promoted Cyclization of Δ 6 -α-Iodoketone

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Abstract

A chiral-pool-based synthesis of the platensimycin core was achieved using (S)-lactic acid as an inexpensive starting material. The cyclohexenone ring was closed in a Mukaiyama–Michael domino sequence, while the quaternary stereocenter was created by a highly stereoselective decarboxylative allylation. The spirobicyclic skeleton was constructed by a RCM reaction. A new silver(I)-promoted cyclization reaction of Δ 6 - and Δ 7 -α-iodoketones was developed and applied for the pivotal carbon–carbon bond formation. The scope and limitations of this methodology are also presented.

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Trajkovic, M., Ferjancic, Z., Saicic, R. N., & Bihelovic, F. (2019). Enantioselective Synthesis of the Platensimycin Core by Silver(I)-Promoted Cyclization of Δ 6 -α-Iodoketone. Chemistry - A European Journal, 25(17), 4340–4344. https://doi.org/10.1002/chem.201900497

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