Functionalized Benzofurans via Microwave‐Promoted Tandem Claisen‐Rearrangement/5‐
<scp>
<i>endo</i>
</scp>
‐dig Cyclization
作者:Christiane Schultze、Bernd Schmidt
DOI:10.1002/jhet.3671
日期:2019.9
irradiation in dimethylformamide, a tandem sequence of Claisen‐rearrangement and 5‐endo‐dig cyclization to furnish 7‐allyl‐substituted benzofurans. With terminal alkynes, chroman‐4‐ones and enaminoketones become the main products. A mechanistic proposal for this observation relies on a reaction of the starting material with the solvent dimethylformamide under the microwave conditions.