Diels-Alder trapping of ortho-quinone methides. A new entry to substituted xanthene-1,4-diones

[摘要]：Highly regioselective Diels-Alder reactions of a non-protected beta-hydroxy quinone have been achieved after formation of chelated lithium alkoxides. In this report, we demonstrate on a model system, that the selectivity of reactions based on 1,3-dioxy-substituted quinones can be efficiently controlled by the addition of Lewis acid (AlMe3), which chelates the substrate by the two oxygens.

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