Side-chain migration reactions and ring B aromatization in labdanes: scope and limitations. Synthesis of isofregenedane type tetrahydronaphthalenic diterpenes
The reaction of bicyclicditerpenes with an allylic oxygenated function or an equivalent functionality on ring B in the presence of I2/benzene afforded a simple and rapid synthesis of tetrahydronaphthalenic diterpenes of the isofregenedane class.