their biological evaluation is reported, featuring a new strategy for the asymmetricconstruction of γ-butyrolactones with stereogenic side chains in the 4-position. Starting from the renewable resource methyl 2-furoate, the sesquiterpene lactone was synthesized in 9 steps and 4.8% overall yield via an asymmetriccyclopropanation and two diastereoselective nucleophile additions making use of a donor-