The synthesis of dl-coriolin

The synthesis of dienone $\text{2}$, which has previously been converted into the title compound in one step, is described. The methanoindene $\text{7}$ is transformed into dienone-alcohol $\text{58}$ in eighteen steps (12% overall yield). This was then hyaroxylated at C-8, using the known method, to afford key dienone $\text{2}$.