New construction of the bicyclo[3.3.1]nonane system via Lewis acid promoted regioselective ring-opening reaction of the tricyclo[4.4.0.05,7]dec-2-ene derivative

A new access to the bicyclo[3.3.1]nonane system, which is a common structure in a number of polyisoprenylated phloroglucinol derivatives (phloroglucins), has been developed via the Lewis acid promoted regioselective ring-opening reaction of the cyclopropane, a tricyclo[4.4.0.05,7]dec-2-ene derivative.