Abstract
Ring-closing metathesis has been applied to the synthesis of extremely rigid 13 to 16 membered ring lactones starting from alkenyl p-(O-allyl)cinnamates and p-(O-allyl)dihydrocinnamates. The core structure of pondaplin, a natural ansa macrolide has been prepared starting from a fluoro derivative. The presence of this atom seems to have a crucial role on the success of the RCM.
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