Enantioselective synthesis of (+)-equilenin 1 utilizing two types of cascade ringexpansion reactions of smallring systems is described. The first key step is an asymmetric epoxidation–ring expansion reaction of cyclopropylidene derivatives to afford chiral cyclobutanones. We found that both the fructose-derived chiral ketone and the chiral (salen)Mn(III) complex were effective catalysts for the asymmetric