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• W4280610739 abstract "Many therapeutic agents are macrocyclic trisubstituted alkenes but preparation of these structures is typically inefficient and non-selective. A possible solution would entail catalytic macrocyclic ring-closing metathesis, but these transformations require high catalyst loading, conformationally rigid precursors and are often low yielding and/or non-stereoselective. Here we introduce a ring-closing metathesis strategy for synthesis of trisubstituted macrocyclic olefins in either stereoisomeric form, regardless of the level of entropic assistance. The goal was achieved by addressing several unexpected difficulties, including complications arising from pre-ring-closing metathesis alkene isomerization. The power of the method is highlighted by two examples. The first is the near-complete reversal of substrate-controlled selectivity in the formation of a macrolactam related to an antifungal natural product. The other is a late-stage stereoselective generation of an E-trisubstituted alkene in a 24-membered ring, en route to the cytotoxic natural product dolabelide C. Many bioactive compounds are trisubstituted macrocyclic alkenes, but use of current methods often results in poor yields and low stereoselectivity. Now, a ring-closing metathesis strategy has been developed that enables these compounds to be prepared efficiently and in either stereoisomeric form: an approach that may prove useful in the late stages of total syntheses, for skeletal editing and in drug discovery." @default.
• W4280610739 created "2022-05-22" @default.
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• W4280610739 date "2022-05-16" @default.
• W4280610739 modified "2023-09-30" @default.
• W4280610739 title "E- and Z-trisubstituted macrocyclic alkenes for natural product synthesis and skeletal editing" @default.
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• W4280610739 doi "https://doi.org/10.1038/s41557-022-00935-y" @default.
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