摘要:
The Cu(I)-catalyzed reaction of 2,3-dibromo-1-propenes with beta-ketoesters and 1,3-diketones, respectively, in DMF at 120 degrees C using Cs2CO3 as a base and hydroquinone as an additive exclusively delivers 2,3,5-trisubstituted furans and related compounds with yields up to 96%. The highly regioselective domino process is based on an intermolecular C-allylation followed by an intramolecular Ullmann type O-vinylation and a double bond isomerization.