“…However, because of their rigidity and steric hindrance, the efficient synthesis of polycarbocyclic molecules still remains a considerable challenge for chemists, although a series of synthetic strategies have emerged. These reported strategies mainly include some complicated organic ring-formation transformations, such as the Diels–Alder reaction, cycloadditions, and polyene cyclization . Tandem reactions, particularly those involving the formation, cleavage, and reorganization of multiple C–C bonds, are generally recognized as one of the most powerful approaches for the construction of complex frameworks.…”