Two key reaction types were used for the totalsynthesis of the antibiotic agent (+)‐TMC‐151C: the vinylogousMukaiyamaaldolreaction and silicon‐tethered ring‐closing metathesis (RCM; see scheme). This strategy should provide efficient access to a range of related natural polyketides containing pent‐2‐ene‐1,5‐diol units.