A concise, enantiospecific, Hajos-Parrish ketone based model approach toward the tetracyclic core of complex shiartane-type nortriterpenoid natural products

A concise approach toward the tetracyclic (ABCD) core present in many complex shiartane-type bioactive nortriterpenoids has been conceptualized and executed from the readily available Hajos-Parrish ketone.