Synthesis of Furans through Silver-Catalyzed Propargyl-Claisen Rearrangement Followed by Cyclocondensation
作者:Adeline Palisse、Stefan F. Kirsch
DOI:10.1002/ejoc.201402983
日期:2014.11
The generation of highly substituted furans from propargyl vinyl ethers bearing a free hydroxy group was investigated. In the presence of catalytic amounts of AgBF4, a formal [3,3] sigmatropic rearrangement takes place in the first stage of the sequence. The resulting allenyl carbonyl intermediates then undergo cyclocondensation, which upon double-bond isomerization leads directly to the five-membered