Heck Reactions Starting from Silyl Enol Ethers - A Simple One-Pot Nonaflation-Coupling Procedure for the Synthesis of 1,3-Dienes

Abstract

Starting from silyl enol ether 4 the corresponding alkenylnonaflate 5 was generated by treatment with nonafluorobutanesulfonyl fluoride (NfF) and a catalytic amount of tetra-n-butyl-ammonium fluoride (TBAF). By Pd-catalysis 5 was directly Heck-coupled with a variety of olefins to furnish functionalized 1,3-dienes 6 - 12. This one-pot procedure could be extended to other silyl enol ethers and provides new synthetic options.