efficient, general, and fully stereocontrolled synthesis of eremophilane-type compounds is disclosed. The approach features a highly diastereoselective Diels-Alder/aldol sequence to give a common intermediate, which is subsequently exploited to produce (±)-petasitolone and (±)-fukinone in a short sequence. eremophilane - Diels-Alder reactions - aldol reactions - condensation