an 11-steps 7.2% total yield route. The chiral quaternary carbon was efficiently and steroselectively constructed through an intermolecularPauson–Khandreaction and a Claisen rearrangement reaction with >99% ee; the cyclohexane B was then closed through an aldehyde Friedel–Crafts cyclization. Lastly, the isopropenyl group of ring C was introduced through a Suzuki coupling reaction.