Use of 4-Cyanocoumarins as Dienophiles in a Facile Synthesis of Highly Substituted Dibenzopyranones.

[摘要]：A new synthesis of dibenzopyranones, e.g., I (R1 = H, Me, MeO; R2 = H, Me, Cl), is reported via the Diels-Alder cycloaddn. of 4-cyanocoumarins with 1-silyloxydienes to give the corresponding adducts which were then converted into the title compds. in one step via treatment with base and loss of the cyano and silyloxy groups.

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