With our target intermediate 6 in hand, we now entered the endgame portion of the synthesis. Since epoxide 6 is structurally similar to some of Corey and Crimmins' intermediates, we have drawn on their results for the following transformations. The formation of the last ring was made possible by the addition of the lithium enolate of tertbutylpropionate in THF/HMPA (4:1) (59%) followed by an acid-catalyzed epoxide opening lactonization with CSA to generate lactone 37 in 89% yield. The F-ring lactone was produced via a stereoselective epoxidation with DMDO followed by an oxidation with Br2 and NaOAc in AcOH/H2O (1:1) to afford the penultimate intermediate 38 in 57% yield over 2 steps. 13 Finally, treatment with K2CO3 in MeOH delivered without incident (±)-ginkgolide C (3) in 95% yield which was spectroscopically identical to the natural product.