The first total syntheses of the sesquiterpenes (?-1,10:7,10-bisepoxy-1,10-seco-calamanene and (?-6,7;7,10-bisepoxy-6,7-seco-calamanene.

[摘要]：First total syntheses of the title tricyclic sesquiterpenes I and II, resp., which contain a benzo-fused 2,8-dioxabicyclo[3.2.1]octane framework, were achieved via intramol. acetalization reactions, and thus confirming the structures of the corresponding Hedychium natural products.

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