Jolkinolide A, B, and E were efficiently synthesized from 9-methoxy-carbonyl-4, 4, 10- trimethyl-Δ6-8-octalone 8 through Δ8 (14)-podocalpen-13-one 12. A new synthetic method of γ-ylidenbutenolide consisting of mild esterification and the succeeding intramolecular Wittig-Horner reaction of α-diketone was developed.