The First Total Syntheses of the Sesquiterpenes (\pm)-1,10;7,10-Bisepoxy-1,10-seco-calamanene and (\pm)-6,7;7,10-Bisepoxy-6,7-seco-calamanene

First total syntheses of the tricyclic sesquiterpenes mentioned in the title containing a benzo-fused 2,8-dioxabicyclo[3.2.1]octane framework, confirming the structures of the natural products, are described