Palladium‐Catalyzed Hydrovinylation of Vinyl Triflates with Alkynes An Approach to the Synthesis of 3‐Vinylfuran‐2(5H)‐ones
The reaction of alkynes with vinyl triflates in the presence of catalytic amounts of Pd(OAc)2 and HCOOK, omitting phosphane ligands, affords hydrovinylation products usually in good to high yields. The reaction has been employed to develop a regioselective synthesis of 3-vinylfuran-2(5H)-ones from methyl 4-hydroxy-2-butynoates.