A 100 mL round-bottom flask was charged with a stir bar, 1 (2 g, 11.9 mmol, 1 equiv.), and 80% aqueous acetic acid (40 mL) at room temperature. The resulting solution was stirred at room temperature for 48 hours. Following this time, the solvent was removed under reduced pressure. The residue was purified through column chromatography on Florisil by eluting with hexane/ethyl acetate (20:80) to afford of 2 (1 g, 7.8 mmol, 66%) as a white semi-solid.