A 500 mL round-bottom flask was charged with a stir-bar, 3 (1 g, 4.13 mmol, 1 equiv.), and anhydrous THF (10 mL). The reaction mixture was cooled to -20 °C using an ice-salt water bath. Freshly prepared tri((Z)prop-1-en-1-yl)aluminum (0.3 M in THF, 138 mL, 41.3 mmol, 10 equiv.) was slowly added. The reaction mixture was allowed to warm to room temperature over a period of 12 hours. Following this time, the reaction mixture was cooled to 0 °C using an ice-water bath and quenched with slow addition of 20% aqueous tartaric acid solution (40 mL). After transferring to a separatory funnel, the mixture was extracted with ethyl acetate (2 X 100 mL). The organic layers were combined, dried with anhydrous Na2SO4, and concentrated under reduced pressure. The resulting residue was purified by chromatography on silica gel by eluting with hexane/ethyl acetate (80/20) to afford 5 (0.529 g, 1.86 mmol, 45% yield) as a brown oil.