ChemInform Abstract: Benzopyrans. Part 41. Reactions of 2-(2-Dimethylaminovinyl)-1-benzopyran-4-ones with Various Dienophiles.
Abstract
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ChemInform Abstract
The behavior of dienamines (I), (XIV), and (XVI) towards alkenic and alkynic dienophiles is studied. Unlike several chromenone-derived dienes giving exclusively [4 + 2] cycloadducts with various dienophiles, the dienamine (I) undergoes either Diels—Alder reaction with alkenic dienophiles or Michael addition (through its β- or δ-carbon) to them.