ChemInform Abstract: Fluoroallylboration-Olefination for the Synthesis of (Z)-4,4-Difluoropent-2-enoates and 5,5-Difluoro-5,6-dihydropyran-2-ones

Still—Gennari olefination of substrates (II) affords exclusively the (Z)-isomers (IV) which are transformed to the required pyrones (VI) (important building blocks of natural products) via (Z)-alcohols (V).