Abstract
Allyl, dimethylallyl, crotyl, and prenyl ethers of various aromatic <i>ortho</i>-hydroxy carbonyl compounds undergo a tandem sequence of Claisen rearrangement, carbonyl olefination, and cyclization upon microwave irradiation in the presence of a stabilized ylide. The products are multiply substituted 6- or 8-allylated or prenylated coumarins (2<i>H</i>-chromen-2-ones).
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