functionalized by introducing a double bond conjugated to the carbonyl group (27a→40); moreover, oxygen functionality at C(13) could be introduced by allylic oxidation (28a→41 and 40→42). The enolates produced in situ by the anionic oxy-Cope rearrangement could be trapped by alkylating agents. These alkylations were highly stereoselective when the ketone enolate was trisubstituted as exemplified by