Efficient and Reliable Iodination and O-Methylation of Fluorinated Phenols
作者:Robert Francke、Gregor Schnakenburg、Siegfried R. Waldvogel
DOI:10.1002/ejoc.201000161
日期:2010.4
Fluorinatedphenols and other electron-deficient phenolic substrates are efficiently and cleanly iodinated by an iodine/ iodide mixture employing alkaline conditions. This protocol turned out to be the most practical for the generation of such highly fluorinated iodophenols. For later application in coupling processes the protection of the phenolic hydroxy moiety is often required. Therefore, a practical
3-Butadienes have become valuable buildingblocks in the synthesis of various heterocyclic compounds. The Pd-catalyzed cross-coupling and cyclization reaction of N-(2,3-butadienyl)carboxamide of isopimaric acid with fluorine-substituted 2-iodophenols proceeds with the formation of optically active fluorinated benzofuran and benzopyrane derivatives of isopimaric acid. This transformation opens a potential