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A highly stereoselective synthesis of the C1–C14 macrolactone core of the cytotoxic macrolide (–)‐callipeltoside A has been achieved by utilizing an anti‐selective aldol reaction and Wittig olefination to introduce an (E)‐trisubstituted alkene, chemoselective diisobutylaluminum hydride (DIBAL‐H) reduction of the 2,3‐epoxy tosylate to install the C13 stereocenter, and intramolecular trapping of the...
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